@inproceedings {INPROC-2016-38,
author = {Andreas Wei{\ss} and Vasilios Andrikopoulos and Santiago G{\'o}mez S{\'a}ez and Michael Hahn and Dimka Karastoyanova},
title = {{ChorSystem: A Message-Based System for the Life Cycle Management of Choreographies}},
booktitle = {On the Move to Meaningful Internet Systems: OTM 2016 Conferences: Confederated International Conferences: CoopIS, C\&TC, and ODBASE 2016, Rhodes, Greece, October 24-28, 2016, Proceedings},
editor = {Christophe Debruyne and Herv{\'e} Panetto and Robert Meersman and Tharam Dillon and Eva K{\"u}hn and Declan O'Sullivan and Claudio Agostino Ardagna},
publisher = {Springer International Publishing},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {503--521},
type = {Conference Paper},
month = {October},
year = {2016},
doi = {10.1007/978-3-319-48472-3_30},
keywords = {Collaborative Dynamic Complex (CDC) Systems; Choreography Life Cycle Management; Flexible Choreographies},
language = {English},
cr-category = {H.4.1 Office Automation},
ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2016-38/INPROC-2016-38.pdf},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Service choreographies are commonly used as the means for enabling
inter-organizational collaboration by providing a global view on the message
exchange between involved participants. Choreographies are ideal for a number
of application domains that are classi ed under the Collaborative, Dynamic \&
Complex (CDC) systems area. System users in these application domains require
facilities to control the execution of a choreography instance such as
suspending, resuming or terminating, and thus actively control its life cycle.
We support this requirement by introducing the ChorSystem, a system capable of
managing the complete life cycle of choreographies from choreography modeling,
through deployment, to execution and monitoring. The performance evaluation of
the life cycle operations shows that the ChorSystem introduces an acceptable
performance overhead compared to purely script-based scenarios, while gaining
the abilities to control the choreography life cycle.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2016-38&engl=1}
}
@inproceedings {INPROC-2016-26,
author = {Michael Hahn and Dimka Karastoyanova and Frank Leymann},
title = {{A Management Life Cycle for Data-Aware Service Choreographies}},
booktitle = {Proceedings of the Twenty-Third International Conference on Web Services (ICWS 2016), San Francisco, CA, USA, 2016},
publisher = {IEEE Computer Society},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {364--371},
type = {Conference Paper},
month = {September},
year = {2016},
doi = {10.1109/ICWS.2016.54},
keywords = {Choreography Management Life Cycle; Data Flow Optimization; Service Choreographies; Transparent Data Exchange},
language = {English},
cr-category = {H.4.1 Office Automation,
C.2.4 Distributed Systems},
contact = {Michael Hahn: michael.hahn@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {This work is motivated by the increasing importance and business value of data
in the fields of business process management, scientific workflows as a field
in eScience, and Internet of Things, all of which profiting from the recent
advances in data science and Big data. We introduce a management life cycle
that renders data as first-class citizen in service choreographies and defines
the functions and artifacts necessary for enabling transparent and efficient
data exchange among choreography participants. The inherent goal of the life
cycle, functions and artifacts is to help decouple the data flow, data exchange
and management from the control flow in service compositions and
choreographies. This decoupling enables peer-to-peer data exchange in
choreographies and provides the means for more sophisticated data management
and exchange, as well as data exchange and provisioning optimization.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2016-26&engl=1}
}
@inproceedings {INPROC-2016-04,
author = {Michael Hahn and Dimka Karastoyanova and Frank Leymann},
title = {{Data-Aware Service Choreographies through Transparent Data Exchange}},
booktitle = {Proceedings of the 16th International Conference on Web Engineering (ICWE'16)},
publisher = {Springer International Publishing},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
series = {Lecture Notes in Computer Science (LNCS)},
volume = {9671},
pages = {357--364},
type = {Conference Paper},
month = {June},
year = {2016},
doi = {10.1007/978-3-319-38791-8_20},
keywords = {Service Choreographies; Transparent Data Exchange; Decentralized Data Flow; Data Flow Optimization},
language = {English},
cr-category = {H.4.1 Office Automation,
C.2.4 Distributed Systems},
contact = {Michael Hahn: michael.hahn@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Our focus in this paper is on enabling the decoupling of data flow, data
exchange and management from the control flow in service compositions and
choreographies through novel middleware abstractions and realization. This
allows us to perform the data flow of choreographies in a peer-to-peer fashion
decoupled from their control flow. Our work is motivated by the increasing
importance and business value of data in the fields of business process
management, scientific workflows and the Internet of Things, all of which
profiting from the recent advances in data science and Big data. Our approach
comprises an application life cycle that inherently introduces data exchange
and management as a first-class citizen and defines the functions and artifacts
necessary for enabling transparent data exchange. Moreover, we present an
architecture of the supporting system that contains the Transparent Data
Exchange middleware which enables the data exchange and management on behalf of
service choreographies and provides methods for the optimization of the data
exchange during the execution of service choreographies.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2016-04&engl=1}
}
@inproceedings {INPROC-2016-02,
author = {Vasilios Andrikopoulos and Marina Bitsaki and Santiago G{\'o}mez S{\'a}ez and Michael Hahn and Dimka Karastoyanova and Giorgios Koutras and Alina Psycharaki},
title = {{Evaluating the Effect of Utility-based Decision Making in Collective Adaptive Systems}},
booktitle = {Proceedings of the 6th International Conference on Cloud Computing and Service Science (CLOSER 2016)},
address = {Rome, Italy},
publisher = {SciTePress},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {1--10},
type = {Conference Paper},
month = {April},
year = {2016},
language = {German},
cr-category = {D.2.0 Software Engineering General,
D.2.11 Software Engineering Software Architectures,
D.2.12 Software Engineering Interoperability},
contact = {Vasilios Andrikopoulos: andrikopoulos@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Utility, defined as the perceived satisfaction with a service, provides the
ideal means for decision making on the level of individual entities and
collectives participating in a large-scale dynamic system. Previous works have
already introduced the concept into the area of collective adaptive systems,
and have discussed what is the necessary infrastructure to support the
realization of the involved theoretical concepts into actual decision making.
In this work we focus on two aspects. First, we provide a concrete utility
model for a case study that is part of a larger research project. Second, we
incorporate this model into our implementation of the proposed architecture.
More importantly, we design and execute an experiment that aims to empirically
evaluate the use of utility for decision making by comparing it against simpler
decision making mechanisms.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2016-02&engl=1}
}
@inproceedings {INPROC-2015-43,
author = {Karolina Vukojevic-Haupt and Santiago G{\'o}mez S{\'a}ez and Florian Haupt and Dimka Karastoyanova and Frank Leymann},
title = {{A Middleware-centric Optimization Approach for the Automated Provisioning of Services in the Cloud}},
booktitle = {Proceedings of the 7th IEEE International Conference on Cloud Computing Technology and Science},
publisher = {IEEE},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {174--179},
type = {Conference Paper},
month = {December},
year = {2015},
doi = {10.1109/CloudCom.2015.86},
keywords = {on-demand provisioning; cloud; service-oriented computing; eScience; optimization; dynamic provisioning; SOC},
language = {English},
cr-category = {C.2.4 Distributed Systems,
D.2.11 Software Engineering Software Architectures,
I.6.7 Simulation Support Systems},
contact = {karolina.vukojevic@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {The on-demand provisioning of services, a cloud-based extension for traditional
service-oriented architectures, improves the handling of services in usage
scenarios where they are only used rarely and irregularly. However, the
standard process of service provisioning and de-provisioning shows still some
shortcomings when applying it in real world. In this paper, we introduce a
middleware-centric optimization approach that can be integrated in the existing
on-demand provisioning middleware in a loosely coupled manner, changing the
standard provisioning and de-provisioning behavior in order to improve it with
respect to cost and time. We define and implement a set of optimization
strategies, evaluate them based on a real world use case from the eScience
domain and provide qualitative as well as quantitative decision support for
effectively selecting and parametrizing a suitable strategy. Altogether, our
work improves the applicability of the existing on-demand provisioning approach
and system in real world, including guidance for selecting the suitable
optimization strategy for specific use cases.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2015-43&engl=1}
}
@inproceedings {INPROC-2015-40,
author = {Andreas Wei{\ss} and Vasilios Andrikopoulos and Michael Hahn and Dimka Karastoyanova},
title = {{Rewinding and Repeating Scientific Choreographies}},
booktitle = {On the Move to Meaningful Internet Systems: OTM 2015 Conferences},
editor = {H. Panetto et al. C. Debruyne},
publisher = {Springer},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {337--347},
type = {Conference Paper},
month = {October},
year = {2015},
doi = {10.1007/978-3-319-26148-5_22},
keywords = {Ad Hoc changes; Choreography; Workflow; Flexibility},
language = {English},
cr-category = {C.2.4 Distributed Systems,
H.4.1 Office Automation},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Scientists that use the workflow paradigm for the enactment of scientific
experiments need support for trial-and-error modeling, as well as flexibility
mechanisms that enable the ad hoc repetition of workflow logic for the
convergence of results or error handling. Towards this goal, in this paper we
introduce the facilities to repeat partially or completely running
choreographies on demand. Choreographies are interesting for the scientific
workflow community because so-called multi-scale/field (multi-*) experiments
can be modeled and enacted as choreographies of scientific workflows. A
prerequisite for choreography repetition is the rewinding of the involved
participant instances to a previous state. For this purpose, we define a formal
model representing choreography models and their instances as well as a concept
to repeat choreography logic. Furthermore, we provide an algorithm for
determining the rewinding points in each involved participant instance.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2015-40&engl=1}
}
@inproceedings {INPROC-2015-35,
author = {Santiago G{\'o}mez S{\'a}ez and Vasilios Andrikopoulos and Michael Hahn and Dimka Karastoyanova and Andreas Wei{\ss}},
title = {{Enabling Reusable and Adaptive Modeling, Provisioning \& Execution of BPEL Processes}},
booktitle = {Proceedings of the 8th International Conference on Service-Oriented Computing and Applications (SOCA'15)},
address = {Rome, Italy},
publisher = {IEEE Computer Society},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
type = {Conference Paper},
month = {October},
year = {2015},
language = {English},
cr-category = {H.4.1 Office Automation,
C.2.4 Distributed Systems,
D.2.11 Software Engineering Software Architectures},
contact = {Santiago G{\'o}mez S{\'a}ez: gomez-saez@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {The Business Process Execution Language (BPEL) is a well established language
for the definition of process models as service orchestrations. Service
orchestrations are used in conjunction with service choreographies in order to
create distributed, complex service-based applications. An important
requirement for such applications is the need for flexibility during both their
modeling and their execution. This work builds on this need by proposing an
extension of BPEL in order to allow the definition of abstract constructs on
the level of executable process models. Such constructs can be refined to
concrete activities at any time, enabling the reuse of existing models and the
dynamic adaptation to changing requirements. The design and implementation of
the language extension, as well as that of the supporting environment required
for the modeling, provisioning, and execution of such process models is further
discussed. A case study on a city-wide public transportation system offers the
means for an evaluation of the proposed approach.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2015-35&engl=1}
}
@inproceedings {INPROC-2015-18,
author = {Andreas Wei{\ss} and Vasilios Andrikopoulos and Michael Hahn and Dimka Karastoyanova},
title = {{Enabling the Extraction and Insertion of Reusable Choreography Fragments}},
booktitle = {Proceedings of the 22nd IEEE International Conference on Web Services},
address = {New York},
publisher = {IEEE},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {686--694},
type = {Conference Paper},
month = {June},
year = {2015},
doi = {10.1109/ICWS.2015.96},
language = {English},
cr-category = {H.4.1 Office Automation},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Reuse of service orchestrations or service compositions is extensively studied
in the literature of process modeling. Sub-processes, process templates,
process variants, and process reference models are employed as reusable
elements for these purposes. The concept of process fragments has been
previously introduced in order to capture parts of a process model and store
them for later reuse. However, similar efforts on facilitating the reuse of
processes that cross the boundaries of organizations expressed as service
choreographies are not available yet. In this paper, we introduce the concept
of choreography fragments as reusable elements for service choreography
modeling. Choreography fragments can be extracted from choreography models,
adapted, stored, and later inserted into new models. Based on a formal model
for choreography fragments, we define methods and algorithms for the extraction
and insertion of fragments from and into service choreographies. We then
discuss an experimental and proof-of-concept evaluation of our proposal.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2015-18&engl=1}
}
@inproceedings {INPROC-2015-14,
author = {Santiago G{\'o}mez S{\'a}ez and Vasilios Andrikopoulos and Michael Hahn and Dimka Karastoyanova and Frank Leymann and Marigianna Skouradaki and Karolina Vukojevic-Haupt},
title = {{Performance and Cost Evaluation for the Migration of a Scientific Workflow Infrastructure to the Cloud}},
booktitle = {Proceedings of the 5th International Conference on Cloud Computing and Service Science (CLOSER 2015)},
publisher = {SciTePress},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {352--361},
type = {Conference Paper},
month = {May},
year = {2015},
keywords = {Workflow Simulation; eScience; IaaS; Performance Evaluation; Cost Evaluation; Cloud Migration},
language = {English},
cr-category = {C.2.4 Distributed Systems,
D.2.8 Software Engineering Metrics,
D.2.11 Software Engineering Software Architectures},
contact = {Santiago G{\'o}mez S{\'a}ez: santiago.gomez-saez@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {The success of the Cloud computing paradigm, together with the increase of
Cloud providers and optimized Infrastructure-as-a-Service (IaaS) offerings have
contributed to a raise in the number of research and industry communities that
are strong supporters of migrating and running their applications in the Cloud.
Focusing on eScience simulation-based applications, scientific workflows have
been widely adopted in the last years, and the scientific workflow management
systems have become strong candidates for being migrated to the Cloud. In this
research work we aim at empirically evaluating multiple Cloud providers and
their corresponding optimized and non-optimized IaaS offerings with respect to
their offered performance, and its impact on the incurred monetary costs when
migrating and executing a workflow-based simulation environment. The
experiments show significant performance improvements and reduced monetary
costs when executing the simulation environment in off-premise Clouds.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2015-14&engl=1}
}
@inproceedings {INPROC-2015-07,
author = {Andreas Wei{\ss} and Vasilios Andrikopoulos and Michael Hahn and Dimka Karastoyanova},
title = {{Fostering Reuse in Choreography Modeling Through Choreography Fragments}},
booktitle = {Proceedings of the 17th International Conference on Enterprise Information Systems ICEIS 2015},
publisher = {SciTePress},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {28--36},
type = {Conference Paper},
month = {April},
year = {2015},
doi = {10.5220/0005342000280036},
keywords = {Choreography; Choreography Fragment; Choreography Fragment Pattern; Choreography Modeling; Reuse},
language = {English},
cr-category = {H.4.1 Office Automation},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {The concept of reuse in process models is extensively studied in the
literature. Sub-processes, process templates, process variants, and process
reference models are employed as reusable elements for process modeling.
Additionally, the notion of process fragments has been introduced to capture
parts of a process model and store them for later reuse. In contrast, concepts
for reuse of processes that cross the boundaries of organizations, i.e.,
choreographies, have not yet been studied in the appropriate level of detail.
In this paper, we introduce the concept of choreography fragments as reusable
elements for choreography modeling. Choreography fragments can be extracted
from choreography models, adapted, stored, and inserted into new models. We
provide a formal model for choreography fragments and identify a set of
patterns constituting frequently occurring meaningful choreography fragments.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2015-07&engl=1}
}
@inproceedings {INPROC-2014-77,
author = {Karolina Vukojevic-Haupt and Florian Haupt and Dimka Karastoyanova and Frank Leymann},
title = {{Replicability of Dynamically Provisioned Scientific Experiments}},
booktitle = {IEEE International Conference on Service Oriented Computing \& Applications (SOCA 2014)},
publisher = {IEEE},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {119--124},
type = {Conference Paper},
month = {November},
year = {2014},
doi = {10.1109/SOCA.2014.54},
keywords = {replicability; SOC; SOA; Cloud; on-demand provisioning and deprovisioning; eScience},
language = {English},
cr-category = {C.2.4 Distributed Systems,
D.2.11 Software Engineering Software Architectures},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {The ability to repeat an experiment, known as replicability, is a basic concept
of scientific research and also an important aspect in the field of eScience.
The principles of Service Oriented Computing (SOC) and Cloud Computing, both
based on high runtime dynamicity, are more and more adopted in the eScience
domain. Simulation experiments exploiting these principles introduce
significant challenges with respect to replicability. Current research
activities mainly focus on how to exploit SOC and Cloud for eScience, while the
aspect of replicability for such experiments is still an open issue. In this
paper we define a general method to identify points of dynamicity in simulation
experiments and to handle them in order to enable replicability. We
systematically examine different types of service binding strategies, the main
source of dynamicity, and derive a method and corresponding architecture to
handle this dynamicity with respect to replicability. Our work enables
scientists to perform simulation experiments that exploit the dynamicity and
flexibility of SOC and Cloud Computing but still are repeatable.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2014-77&engl=1}
}
@inproceedings {INPROC-2014-71,
author = {Michael Hahn and Santiago G{\'o}mez S{\'a}ez and Vasilios Andrikopoulos and Dimka Karastoyanova and Frank Leymann},
title = {{Development and Evaluation of a Multi-tenant Service Middleware PaaS Solution}},
booktitle = {Proceedings of the 7th International Conference on Utility and Cloud Computing (UCC 2014)},
publisher = {IEEE Computer Society},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {278--287},
type = {Conference Paper},
month = {December},
year = {2014},
doi = {10.1109/UCC.2014.37},
keywords = {Multi-tenancy; Cloud middleware; PaaS; Performance Evaluation},
language = {English},
cr-category = {C.2.4 Distributed Systems,
H.4.1 Office Automation},
contact = {Michael Hahn: michael.hahn@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {In many modern systems, applications or services are realized as compositions
of multiple existing services that can be enacted by Service Composition
Engines (SCEs), which provide the required functionality to enable their
definition and execution. SCEs typically use the capabilities of an Enterprise
Service Bus (ESB) which serves as the messaging hub between the composed
services aiming at ensuring their integration. Together, an SCE and ESB
solution comprise the service middleware required for the definition and
execution of service-based composite applications. Offering a service
middleware solution as a service creates a PaaS offering that allows the
service consumers to share the service middleware solution in a multi-tenant
manner. However, multi-tenancy support for service middleware solutions remains
an open issue. For this purpose, in this work we introduce a general
architecture for the realization of a multi-tenant service middleware PaaS
solution. This architecture is prototypically realized based on open-source,
multi-tenant ESB and SCE solutions. The resulting service middleware provides
configurability for service compositions, tenant-aware messaging, and
tenant-based administration and management of the SCE and the ESB. We also
present an empirical evaluation of the multi-tenant service middleware with
focus on the SCE. The results of these experiments show a performance
degradation within acceptable limits when scaling the number of tenants and
tenant users.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2014-71&engl=1}
}
@inproceedings {INPROC-2014-69,
author = {Michael Hahn and Santiago G{\'o}mez S{\'a}ez and Vasilios Andrikopoulos and Dimka Karastoyanova and Frank Leymann},
title = {{SCE^MT: A Multi-tenant Service Composition Engine}},
booktitle = {Proceedings of the 7th International Conference on Service-Oriented Computing and Applications (SOCA'14)},
publisher = {IEEE Computer Society},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {89--96},
type = {Conference Paper},
month = {November},
year = {2014},
doi = {10.1109/SOCA.2014.9},
keywords = {Multi-tenancy; Service Composition Engine; Cloud middleware; Performance Evaluation},
language = {English},
cr-category = {C.2.4 Distributed Systems},
contact = {Michael Hahn: michael.hahn@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {The support of multi-tenancy is an essential requirement for leveraging the
full capacity of Cloud computing. Multi-tenancy enables service providers to
maximize the utilization of their infrastructure and to reduce the servicing
costs per customer, thus indirectly benefiting also the customers. In addition,
it allows both providers and consumers to reap the advantages of Cloud-based
applications configurable for the needs of different tenants. Nowadays, new
applications or services are typically compositions of multiple existing
services. Service Composition Engines (SCEs) provide the required functionality
to enable the definition and execution of such compositions. Multi-tenancy on
the level of SCEs allows for both process model, as well as underlying
infrastructure sharing. Towards the goal of enabling multi-tenancy of SCEs, in
this paper, we investigate the requirements and define a general architecture
for the realization of a multi-tenant SCE solution. This architecture is
prototypically realized based on an open-source SCE implementation and
integrated into an existing multi-tenant aware Enterprise Service Bus (ESB).
The performance evaluation of our prototype shows promising results in terms of
the degradation introduced due to processing and communication overhead.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2014-69&engl=1}
}
@inproceedings {INPROC-2014-60,
author = {Andreas Wei{\ss} and Santiago G{\'o}mez S{\'a}ez and Michael Hahn and Dimka Karastoyanova},
title = {{Approach and Refinement Strategies for Flexible Choreography Enactment}},
booktitle = {22nd International Conference on Cooperative Information Systems (CoopIS 2014)},
editor = {H. Panetto et al. R. Meersman},
publisher = {Springer Berlin Heidelberg},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {93--111},
type = {Conference Paper},
month = {October},
year = {2014},
doi = {10.1007/978-3-662-45563-0_6},
keywords = {Process Flexibility, Choreography Flexibility, Refinement Strategies, Late Modeling, Late Selection, Process Fragments},
language = {English},
cr-category = {H.4.1 Office Automation},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Collaborative, Dynamic \& Complex (CDC) systems such as adaptive pervasive
systems, eScience applications, and complex business systems inherently require
modeling and run time exibility. Since domain problems in CDC systems are
expressed as service choreographies and enacted by service orchestrations, we
propose an approach introducing placeholder modeling constructs usable both on
the level of choreographies and orchestrations, and a classi cation of
strategies for their re nement to executable work ows. These abstract modeling
constructs allow deferring the modeling decisions to later points in the life
cycle of choreographies. This supports run time scenarios such as incorporating
new participants into a choreography after its enactment has started or
enhancing the process logic of some of the participants. We provide a
prototypical implementation of the approach and evaluate it by means of a case
study.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2014-60&engl=1}
}
@inproceedings {INPROC-2014-47,
author = {Vasilios Andrikopoulos and Alexander Darsow and Dimka Karastoyanova and Frank Leymann},
title = {{CloudDSF - The Cloud Decision Support Framework for Application Migration}},
booktitle = {Proceedings of the Third European Conference on Service-Oriented and Cloud Computing (ESOCC 2014)},
publisher = {Springer},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
series = {Lecture Notes in Computer Science (LNCS)},
pages = {1--15},
type = {Conference Paper},
month = {September},
year = {2014},
keywords = {application migration; decision support; decision visualization},
language = {English},
cr-category = {D.2.7 Software Engineering Distribution, Maintenance, and Enhancement,
D.2.11 Software Engineering Software Architectures,
H.3.4 Information Storage and Retrieval Systems and Software,
H.3.5 Online Information Services,
H.4.2 Information Systems Applications Types of Systems},
contact = {vasilios.andrikopoulos@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Migrating existing applications to cloud solutions is a multi-dimensional
problem that spans beyond technical issues and into the financial, security and
organizational domains. The existing works in the field form a picture of a
maturing but still incomplete research area, requiring the introduction of
comprehensive solutions for the migration of enterprise systems and
applications to cloud solutions. As part of this effort, in this work we focus
on supporting decision makers in evaluating the need for migration, and guiding
them along the decisions that need to be made before the actual migration
process. For this purpose we build on existing work to provide an elaborated
decision support framework that is available as a Web application. We discuss
the evaluation of the framework by experts, identify its deficiencies and
outline our future steps.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2014-47&engl=1}
}
@inproceedings {INPROC-2014-42,
author = {Michael Hahn and Dimka Karastoyanova},
title = {{Configurable and Collaborative Scientific Workflows}},
booktitle = {Workshop on Simulation Technology: Systems for Data Intensive Simulations (SimTech(at)GI) in Conjunction with INFORMATIK 2014},
publisher = {Gesellschaft f{\"u}r Informatik e.V. (GI)},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
series = {Lecture Notes in Informatics (LNI)},
volume = {P-232},
pages = {125--136},
type = {Workshop Paper},
month = {September},
year = {2014},
language = {English},
cr-category = {H.4.1 Office Automation},
contact = {Michael Hahn: michael.hahn@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {The use of workflows to support and realize computer simulations, experiments
and calculations is well-accepted in the e-Science domain. The different tasks
and the parameters of the simulation are therefore specified in workflow
models. Scientists typically work in a trial-and-error manner which means they
do not know how the final workflow of a simulation has to look like. Therefore,
they use a maybe insufficient workflow model as a basis and try to improve this
model over multiple iterations to get a better approximation to the problem to
solve. So in each iteration multiple trials are based on different variants of
the same workflow model. Towards the goal of building variants of workflow
models and enabling the reuse of existing scientific workflows in a controlled
and well-defined manner, in this paper, we identify how configurable workflow
models will support scientists to customize existing workflow models by their
configuration. Therefore, we introduce possible configuration options for
scientific workflows and how scientists can specify them. Furthermore, we show
how configurable workflow models are a first step towards enabling the
collaboration among scientists in creating scientific workflows.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2014-42&engl=1}
}
@inproceedings {INPROC-2014-40,
author = {Andreas Wei{\ss} and Dimka Karastoyanova and David Molnar and Siegfried Schmauder},
title = {{Coupling of Existing Simulations using Bottom-up Modeling of Choreographies}},
booktitle = {Workshop on Simulation Technology: Systems for Data Intensive Simulations (SimTech\&\#64;GI) in Conjunction with INFORMATIK 2014},
publisher = {Gesellschaft f{\"u}r Informatik e.V. (GI)},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {101--112},
type = {Workshop Paper},
month = {September},
year = {2014},
language = {English},
cr-category = {H.4.1 Office Automation},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {As a contribution for eScience, we discuss the bottom-up derivation of
scientific choreography models from existing simulation workflows
interconnected as a multi-scale and multi-field simulation. Starting from a
motivating scenario of only implicitly coupled simulation workflows for the
studying of thermal aging of iron-copper alloys, we present a choreography life
cycle supporting the bottom-up derivation of choreography models and the
propagation of changes to the underlying simulation workflows in a round-trip
manner. Furthermore, we discuss several distinct starting points for the
derivation, namely explicitly and implicitly connected simulation workflow
models and already running simulation workflow instances.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2014-40&engl=1}
}
@inproceedings {INPROC-2014-39,
author = {Andreas Wei{\ss} and Dimka Karastoyanova},
title = {{A Life Cycle for Coupled Multi-Scale, Multi-Field Experiments Realized through Choreographies}},
booktitle = {Proceedings of the 18th IEEE International EDOC Conference (EDOC 2014)},
publisher = {IEEE Computer Society},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {234--241},
type = {Conference Paper},
month = {September},
year = {2014},
doi = {10.1109/EDOC.2014.39},
language = {English},
cr-category = {H.4.1 Office Automation},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Current systems for enacting scientific experiments, and in particular
simulation workflows, do not support multi-scale and multi-field problems if
they are not coupled on the level of the mathematical model. We present a life
cycle that utilizes the notion of choreographies to enable the trial-and-error
modeling and execution of multi-scale and/or multi-field simulations. The life
cycle exhibits two views reflecting the characteristics of modeling and
execution in a top-down and bottom-up manner. It defines techniques for
composing data-intensive, scientific workflows in more complex simulations in a
generic, domain-independent way, and thus provides scientists with means for
collaborative and integrated data management based on the workflow paradigm.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2014-39&engl=1}
}
@inproceedings {INPROC-2014-34,
author = {Karolina Vukojevic-Haupt and Florian Haupt and Dimka Karastoyanova and Frank Leymann},
title = {{Service Selection for On-demand Provisioned Services}},
booktitle = {Proceedings of the 18th IEEE International EDOC Conference (EDOC 2014)},
publisher = {IEEE},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {120--127},
type = {Conference Paper},
month = {September},
year = {2014},
doi = {10.1109/EDOC.2014.25},
language = {English},
cr-category = {D.2.11 Software Engineering Software Architectures},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Service selection is an important concept in service oriented architectures
that enables the dynamic binding of services based on functional and
non-functional requirements. The introduction of the concept of on-demand
provisioned services significantly changes the nature of services and as a
consequence the traditional service selection process does not fit anymore.
Existing approaches for service selection rely on the always on semantic of
services, an assumption that is not valid for on-demand provisioned services.
We tackle this problem by adapting the traditional service selection process
and by defining an additional step covering the changes introduced by the
concept of on-demand provisioning. Our solution comprises an extended
architecture for on-demand provisioning, a metamodel for a service registry and
a detailed definition and discussion of the adapted and extended service
selection process. The work presented in this paper allows keeping the
advantages of dynamic service binding at runtime and combining them with the
advantages of Cloud computing exploited through the concept of on-demand
provisioning.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2014-34&engl=1}
}
@inproceedings {INPROC-2014-33,
author = {Florian Haupt and Markus Fischer and Dimka Karastoyanova and Frank Leymann and Karolina Vukojevic-Haupt},
title = {{Service Composition for REST}},
booktitle = {Proceedings of the 18th IEEE International EDOC Conference (EDOC 2014)},
publisher = {IEEE},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {110--119},
type = {Conference Paper},
month = {September},
year = {2014},
issn = {1541-7719},
doi = {10.1109/EDOC.2014.24},
keywords = {Service Composition; REST; BPEL},
language = {English},
cr-category = {D.2.11 Software Engineering Software Architectures},
contact = {florian.haupt@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {One of the key strengths of service oriented architectures, the concept of
service composition to reuse and combine existing services in order to achieve
new and superior functionality, promises similar advantages when applied to
resources oriented architectures. The challenge in this context is how to
realize service composition in compliance with the constraints defined by the
REST architectural style and how to realize it in a way that it can be
integrated to and benefit from existing service composition solutions. Existing
approaches to REST service composition are mostly bound to the HTTP protocol
and often lack a systematic methodology and a mature and standards based
realization approach. In our work, we follow a comprehensible methodology by
deriving the key requirements for REST service composition directly from the
REST constraints and then mapping these requirements to a standard compliant
extension of the BPEL composition language. We performed a general requirements
analysis for REST service composition, defined a meta model for a corresponding
BPEL extension, realized this extension prototypically and validated it based
on a real world use case from the eScience domain. Our work provides a general
methodology to enable REST service composition as well as a realization
approach that enables the combined composition of WSDL and REST services in a
mature and robust way.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2014-33&engl=1}
}
@inproceedings {INPROC-2014-23,
author = {Florian Haupt and Dimka Karastoyanova and Frank Leymann and Benjamin Schroth},
title = {{A Model-Driven Approach for REST Compliant Services}},
booktitle = {Web Services (ICWS), 2014 IEEE International Conference on},
editor = {IEEE},
publisher = {IEEE},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {129--136},
type = {Conference Paper},
month = {July},
year = {2014},
isbn = {978-1-4799-5053-9},
doi = {10.1109/ICWS.2014.30},
keywords = {REST; MDSD},
language = {English},
cr-category = {D.2.11 Software Engineering Software Architectures},
contact = {florian.haupt@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {The design of applications that comply to the REST architectural style requires
observing a given set of architectural constraints. Following these constraints
and therefore designing REST compliant applications is a non-trivial task often
not fulfilled properly. There exist several approaches for the modeling and
formal description of REST applications, but most of them do not pay any
attention to how these approaches can support or even force REST compliance. In
this paper we propose a model driven approach for modeling REST services. We
introduce a multi layered model which enables (partially) enforcing REST
compliance by separating different concerns through separate models. We
contribute a multi layered meta-model for REST applications, discuss the
connection to REST compliance and show an implementation of our approach based
on the proposed meta-model and method. As a result our approach provides a
holistic method for the design and realization of REST applications exhibiting
the desired level of compliance to the constraints of the REST architectural
style.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2014-23&engl=1}
}
@inproceedings {INPROC-2014-20,
author = {Vasilios Andrikopoulos and Marina Bitsaki and Antonio Bucchiarone and Santiago G{\'o}mez S{\'a}ez and Dimka Karastoyanova and Frank Leymann and Christos Nikolaou and Marco Pistore},
title = {{A Game Theoretic Approach for Managing Multi-Modal Urban Mobility Systems}},
booktitle = {Proceedings of the 5th International Conference on Applied Human Factors and Ergonomics (AHFE 2014)},
address = {Krak{\'o}w, Poland},
publisher = {CRC Press/Taylor \& Francis},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
type = {Conference Paper},
month = {July},
year = {2014},
language = {English},
cr-category = {D.2.0 Software Engineering General,
G.4 Mathematical Software,
I.1.2 Symbolic and Algebraic Manipulation Algorithms,
I.2.11 Distributed Artificial Intelligence},
contact = {Vasilios Andrikopoulos: andrikopoulos@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Collective adaptive systems provide secure and robust collaboration between
heterogeneous entities such as humans and computer systems. Such entities have
potentially conflicting goals that attempt to satisfy by interacting with each
other. Understanding and analyzing their behavior and evolution requires
technical, social and economic aspects of modeling. In this paper, we develop a
new design principle to describe an integrated and multimodal urban mobility
system and model the interactions of various entities by means of game
theoretic techniques.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2014-20&engl=1}
}
@inproceedings {INPROC-2014-11,
author = {Vasilios Andrikopoulos and Marina Bitsaki and Santiago G{\'o}mez S{\'a}ez and Dimka Karastoyanova and Christos Nikolaou and Alina Psycharaki},
title = {{Utility-based Decision Making in Collective Adaptive Systems}},
booktitle = {Proceedings of the Fourth International Conference on Cloud Computing and Service Science (CLOSER'14)},
publisher = {SciTePress},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {308--314},
type = {Conference Paper},
month = {April},
year = {2014},
language = {English},
cr-category = {D.2.0 Software Engineering General,
D.2.11 Software Engineering Software Architectures,
D.2.12 Software Engineering Interoperability},
contact = {Vasilios Andrikopoulos: vasilios.andrikopoulos@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Large-scale systems comprising of multiple heterogeneous entities are directly
influenced by the interactions of their participating entities. Such entities,
both physical and virtual, attempt to satisfy their objectives by dynamically
collaborating with each other, and thus forming collective adaptive systems.
These systems are subject to the dynamicity of the entities' objectives, and to
changes to the environment. In this work we focus on the latter, i.e. on
providing the means for entities in such systems to model, monitor and evaluate
their perceived utility by participating in the system. This allows for them to
make informed decisions about their interactions with other entities in the
system. For this purpose we propose a utility-based approach for decision
making, as well as an architecture that allows for the support of this
approach.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2014-11&engl=1}
}
@inproceedings {INPROC-2014-08,
author = {Vasilios Andrikopoulos and Santiago G{\'o}mez S{\'a}ez and Dimka Karastoyanova and Andreas Wei{\ss}},
title = {{Collaborative, Dynamic \& Complex Systems: Modeling, Provision \& Execution}},
booktitle = {Proceedings of the Fourth International Conference on Cloud Computing and Service Science (CLOSER'14)},
publisher = {SciTePress},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {276--286},
type = {Conference Paper},
month = {April},
year = {2014},
language = {English},
cr-category = {D.2.0 Software Engineering General,
D.2.11 Software Engineering Software Architectures,
D.2.12 Software Engineering Interoperability},
contact = {Vasilios Andrikopoulos: andrikopoulos@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Service orientation has significantly facilitated the development of complex
distributed systems spanning multiple organizations. However, different
application areas approach such systems in domain-specific ways, focusing only
on particular aspects relevant for their application types. As a result, we
observe a very fragmented landscape of service-oriented systems, which does not
enable collaboration across organizations. To address this concern, in this
work we introduce the notion of Collaborative, Dynamic and Complex (CDC)
systems and position them with respect to existing technologies. In addition,
we present how CDC systems are modeled and the steps to provision and execute
them. Furthermore, we contribute an architecture and prototypical
implementation, which we evaluate by means of a case study in a Cloud-enabled
context-aware pervasive application.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2014-08&engl=1}
}
@inproceedings {INPROC-2013-58,
author = {Karolina Vukojevic-Haupt and Dimka Karastoyanova and Frank Leymann},
title = {{On-demand Provisioning of Infrastructure, Middleware and Services for Simulation Workflows}},
booktitle = {Proceedings of the 6th IEEE International Conference on Service Oriented Computing \& Applications (SOCA 2013), Kauai, USA, 16.-18.12.2013.},
address = {Kauai, USA},
publisher = {IEEE Press},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {91--98},
type = {Conference Paper},
month = {December},
year = {2013},
doi = {10.1109/SOCA.2013.21},
keywords = {on-demand provisioning and deprovisioning; dynamic service deployment and provisioning; provisioning engine; bootware; simulation workflows; eScience; SOC; Cloud; TOSCA},
language = {English},
cr-category = {H.4.1 Office Automation,
C.2.4 Distributed Systems,
I.6.7 Simulation Support Systems},
ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2013-58/INPROC-2013-58.pdf},
contact = {karolina.vukojevic@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Service orientation is a mainstream paradigm in business applications and gains
even greater acceptance in the very active field of eScience. In SOC service
binding strategies have been defined to specify the point in time a service can
be discovered and selected for use, namely static binding, dynamic binding at
deployment or at run time, and dynamic service deployment. The basic assumption
in all these strategies is that the software stack and infrastructure necessary
to execute the services are already available. While in service-based business
applications this is typically a valid assumption in scientific applications it
is often not the case. Therefore, in this work we introduce a new binding
strategy for services we call on-demand provisioning which entails provisioning
of the software stack necessary for the service and subsequent dynamic
deployment of the service itself. Towards this goal, we also contribute a
middleware architecture that enables the provisioning of the software stack –
functionality unavailable in conventional service middlewares. We demonstrate
the approach and the capabilities of the middleware and the current state of
the implementation of our approach. For this purpose we use an example
application from the field of eScience that comprises a scientific workflow
management system for simulations.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2013-58&engl=1}
}
@inproceedings {INPROC-2013-56,
author = {Steve Strauch and Vasilios Andrikopoulos and Bachmann Thomas and Dimka Karastoyanova and Stephan Passow and Karolina Vukojevic-Haupt},
title = {{Decision Support for the Migration of the Application Database Layer to the Cloud}},
booktitle = {Proceedings of the 5th IEEE International Conference on Cloud Computing Technology and Science (CloudCom'13)},
publisher = {IEEE Computer Society Press},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {639--646},
type = {Conference Paper},
month = {December},
year = {2013},
doi = {10.1109/CloudCom.2013.90},
keywords = {Data Migration; Decision Support; Database layer; Application Refactoring},
language = {English},
cr-category = {D.2.11 Software Engineering Software Architectures,
H.3.4 Information Storage and Retrieval Systems and Software},
contact = {a href=``http://www.iaas.uni-stuttgart.de/institut/mitarbeiter/strauch''Steve Strauch/ a},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Migrating an existing application to the Cloud is a complex and
multi-dimensional problem requiring in many cases adapting the application in
significant ways. Looking specifically into the database layer of the
application, i.e. the aspect providing data persistence and manipulation
capabilities, this involves dealing with differences in the granularity of
interactions, refactoring of the application to cope with remote data sources,
and addressing data confidentiality concerns. Toward this goal, in this work we
present an application migration methodology which incorporates these aspects,
and a decision support, application refactoring and data migration tool that
assists application developers in realizing this methodology. For purposes of
evaluating our proposal we present the results of a case study conducted in the
context of an eScience project.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2013-56&engl=1}
}
@inproceedings {INPROC-2013-55,
author = {Vasilios Andrikopoulos and Santiago G{\'o}mez S{\'a}ez and Dimka Karastoyanova and Andreas Wei{\ss}},
title = {{Towards Collaborative, Dynamic \& Complex Systems}},
booktitle = {Proceedings of the 6th International Conference on Service-Oriented Computing and Applications (SOCA'13)},
publisher = {IEEE},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
series = {IEEE Computer Society},
pages = {1--5},
type = {Conference Paper},
month = {December},
year = {2013},
keywords = {collaborative, dynamic \& complex systems; service orchestration \& choreography; pervasive computing; service networks; context-awareness},
language = {English},
cr-category = {D.2.0 Software Engineering General,
D.2.11 Software Engineering Software Architectures,
D.2.12 Software Engineering Interoperability},
contact = {vasilios.andrikopoulos@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Service orientation has significantly facilitated the development of complex
distributed systems spanning multiple organizations. However, different
application areas approach such systems in domain-specific ways, focusing on
particular aspects relevant only for their application types. As a result, we
observe a very fragmented landscape of service-oriented systems, which does not
enable collaboration across organizations. To address this concern, in this
work we introduce the notion of Collaborative, Dynamic and Complex (CDC)
systems and position them with respect to existing technologies. In addition,
we present how CDC systems are modeled and the steps to provision and execute
them. We also contribute an architecture enabling CDC Systems with full life
cycle coverage that allows for leveraging service-oriented and Cloud-related
technologies.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2013-55&engl=1}
}
@inproceedings {INPROC-2013-54,
author = {Vasilios Andrikopoulos and Antonio Bucchiarone and Santiago G{\'o}mez S{\'a}ez and Dimka Karastoyanova and Claudio Antares Mezzina},
title = {{Towards Modeling and Execution of Collective Adaptive Systems}},
booktitle = {Proceedings of the 9th International Workshop on Engineering Service-Oriented Applications (WESOA'13)},
publisher = {Springer},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {1--12},
type = {Workshop Paper},
month = {December},
year = {2013},
language = {English},
cr-category = {D.2.0 Software Engineering General,
D.2.11 Software Engineering Software Architectures,
D.2.12 Software Engineering Interoperability},
contact = {vasilios.andrikopoulos@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Collective Adaptive Systems comprise large numbers of heterogeneous entities
that can join and leave the system at any time depending on their own
objectives. In the scope of pervasive computing, both physical and virtual
entities may exist, e.g., buses and their passengers using mobile devices, as
well as city-wide traffic coordination systems. In this paper we introduce a
novel conceptual framework that enables Collective Adaptive Systems based on
well-founded and widely accepted paradigms and technologies like service
orientation, distributed systems, context-aware computing and adaptation of
composite systems. Toward achieving this goal, we also present an architecture
that underpins the envisioned framework, discuss the current state of our
implementation effort, and we outline the open issues and challenges in the
field.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2013-54&engl=1}
}
@inproceedings {INPROC-2013-42,
author = {Dimka Karastoyanova and Vasilios Andrikopoulos},
title = {{eScienceSWaT – Towards an eScience Software Engineering Methodology}},
booktitle = {Proceedings of the 17th International Enterprise Distributed Object Computing Conference Workshops (EDOCW 2013)},
publisher = {IEEE Computer Society Conference Publishing Services},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {229--238},
type = {Workshop Paper},
month = {September},
year = {2013},
keywords = {eScience; scientific experiments; service-oriented systems/applications; patterns; Cloud computing; decision support; automation},
language = {English},
cr-category = {H.4.2 Information Systems Applications Types of Systems,
J.2 Physical Sciences and Engineering},
contact = {karastoyanova@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {eScience is the field trying to provide IT support to scientists throughout the
life cycle of scientific experiments. The major focus is on shortening the time
to new discoveries and revealing knowledge about natural phenomena by providing
software systems for different scientific tasks and for many domains. In this
field, however, one can observe that there are no standardized and systematic
approaches for developing the systems dealing with the processing and analysis
of the large amounts of scientific data. In this paper we introduce
eScienceSWaT, a software engineering methodology that aims at providing a
systematic and user-friendly approach for building software applications for
scientific experiments. The proposed approach considers the existing knowledge
from computer science and software engineering but does not require scientists
to be specialists in these fields. Furthermore, we present an architecture of a
composable system enabling eScienceSWaT. The system is meant to guide
scientists in developing their experiments and features decision support
capabilities based on patterns. Both the methodology and the architecture apply
approaches from Enterprise Computing, Cloud Computing and Software Engineering.
In order to demonstrate the suitability of eScienceSWaT, we apply it to a
scenario from the field of scientific simulations.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2013-42&engl=1}
}
@inproceedings {INPROC-2012-44,
author = {Sebastian Wagner and Christoph Fehling and Dimka Karastoyanova and David Schumm},
title = {{State Propagation-based Monitoring of Business Transactions}},
booktitle = {Proceedings of the 2012 IEEE International Conference on Service-Oriented Computing and Applications},
publisher = {IEEE Xplore},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
type = {Conference Paper},
month = {December},
year = {2012},
doi = {10.1109/SOCA.2012.6449464},
keywords = {Business Transactions, Process View, BPEL, Process Merge, Process Split, Monitoring, State Propagation},
language = {English},
cr-category = {H.4.1 Office Automation},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Business analysts want to monitor the status of their business goals in a
business-centric manner, without any knowledge of the actual implementation
artifacts that contribute achieving these goals. Business transactions are one
means to represent business goals and requirements. A business transaction is
typically implemented by a choreography of different parties contributing to
the accomplishment of the common agreement. To meet the constantly changing
requirements for all parties in a business transaction choreographies often
have to be adapted (e.g. change in the distribution on different execution
environments). The resulting challenge is that the execution state of a
choreography executed on several locations has to be propagated to the business
analyst to enable monitoring of (adapted) business transactions. For this
purpose we introduce a meta-model and state model of business transactions.
Based on these models, we introduce a two-stage monitoring approach involving
state propagation of the execution status of the adapted choreography to the
original choreography and from there to the business transaction.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2012-44&engl=1}
}
@inproceedings {INPROC-2012-43,
author = {Alexander Nowak and Dimka Karastoyanova and Frank Leymann and Andrej Rapoport and David Schumm},
title = {{Flexible Information Design for Business Process Visualizations}},
booktitle = {Proceedings of the 2012 IEEE International Conference on Service-Oriented Computing and Applications},
publisher = {IEEE Xplore},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
type = {Conference Paper},
month = {December},
year = {2012},
doi = {10.1109/SOCA.2012.6449436},
keywords = {Business Process Management, Process Visualization, Process Analysis, Service-oriented Architecture},
language = {English},
cr-category = {H.4.1 Office Automation},
contact = {Senden Sie eine E-Mail an alexander.nowak@iaas.uni-stuttgart.de.},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Profound understanding of business processes is a key success factor for
Business Process Management (BPM). As more and more analytical information like
runtime data from process execution or statistical data from business
intelligence are available the problem of business process complexity becomes
apparent. To improve time-to-productivity as well as to save costs
process-relevant information needs to be provided as fast as possible while
considering easy and fast interpretation and dynamic changes in stakeholders’
demands. The static and use-case specific creation or modification of process
visualizations shown in current approaches and tools, however, is complex, time
consuming, inflexible and thus costly. To address these shortcomings, we
introduce a template-based approach that decouples the creation of
visualization templates from concrete process visualizations. The binding of
customization points of visualization templates to analytical process
information is supported by a graphical editor that enables customization of
visualizations in a fast and flexible manner. Moreover, due to the separation
of concerns, our approach improves the usability of process visualizations
because templates may be created by graphic experts independently from specific
visualization demands. The feasibility of our concept is demonstrated by a
prototypical implementation.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2012-43&engl=1}
}
@inproceedings {INPROC-2012-42,
author = {Michael Reiter and Uwe Breitenb{\"u}cher and Oliver Kopp and Dimka Karastoyanova},
title = {{Quality of Data Driven Simulation Workflows}},
booktitle = {2012 8th IEEE International Conference on eScience},
editor = {IEEE},
publisher = {IEEE Computer Society},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
type = {Conference Paper},
month = {October},
year = {2012},
doi = {10.1109/eScience.2012.6404417},
keywords = {controlling by quality of data; simulation workflows; workflow management system; e-science},
language = {English},
cr-category = {H.4.1 Office Automation,
I.6.7 Simulation Support Systems},
contact = {michael.reiter@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Simulations are characterized by long running calculations and complex data
handling tasks accompanied by non-trivial data dependencies. The workflow
technology helps to automate and steer such simulations. Quality of Data
frameworks are used to determine the goodness of simulation data, e.g., they
analyze the accuracy of input data with regards to the usability within
numerical solvers. In this paper, we present generic approaches using evaluated
Quality of Data to steer simulation workflows. This allows for ensuring that
the predefined requirements such as a precise final result or a short execution
time will be met even after the execution of simulation workflow has been
started. We discuss mechanisms for steering a simulation on all relevant levels
– workflow, service, algorithms, and define a unifying approach to control such
workflows. To realize Quality of Data-driven workflows, we present an
architecture realizing the presented approach and a WS-Policy-based language to
describe Quality of Data requirements and capabilities.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2012-42&engl=1}
}
@inproceedings {INPROC-2012-39,
author = {Dimka Karastoyanova and Dimitrios Dentsas and David Schumm and Mirko Sonntag and Lina Sun and Karolina Vukojevic-Haupt},
title = {{Service-based Integration of Human Users in Workflow-driven Scientific Experiments}},
booktitle = {Proceedings of the 8th IEEE International Conference on eScience (eScience 2012)},
publisher = {IEEE Computer Society Press},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {1--8},
type = {Conference Paper},
month = {October},
year = {2012},
doi = {10.1109/eScience.2012.6404435},
keywords = {Scientific Workflows; Human Task Management; Cyber-infrastructure; Communication Services},
language = {English},
cr-category = {H.4.1 Office Automation,
I.6.7 Simulation Support Systems},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Through increased usage of information technology in research and practice ever
more tasks can be automated to make scientific experiments more efficient in
terms of cost, speed, accuracy, and flexibility. Scientific workflows have
proven useful for the automation of scientific computations. However, not all
tasks of an experiment can be automated. Some decisions still need to be made
by human users, for instance, decisions how an automated system should proceed
in an exceptional situation. To address the need for integration of human users
in such automated systems, we propose the concept of Human Communication Flows,
which specify the way how an application, such as a scientific workflow, can
interact with a human user. We developed a human communication framework that
implements these Communication Flows in a pipes-and-filters architecture
supporting notifications and request-response interactions. For usage within a
scientific workflow we created workflow fragments, which implement the
interaction with the framework. Different Communication Services can be plugged
into this framework to account for different communication capabilities of
human users.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2012-39&engl=1}
}
@inproceedings {INPROC-2012-35,
author = {Dimka Karastoyanova and Manuel Carro and Dragan Ivanovic and Claudia Di Napoli and Maurizio Giordano and Zsolt Nem{\'e}th and Cesare Pautasso},
title = {{Research Challenges on Service Technology Foundations}},
booktitle = {Proceedings of the Workshop on ``European Software Services and Systems Research - Results and Challenges'' (at ICSE 2012)},
address = {Zurich, Switzerland},
publisher = {IEEE Press, NJ, USA},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {27--33},
type = {Workshop Paper},
month = {May},
year = {2012},
isbn = {978-1-4673-1067-3},
keywords = {service-based applications; challenges; technologies; formal models; service compositions; business transactions; KPIs; service networks; minitoring and adaptation; nature-inspired approches; chemical composition; liquid computing; Cloud computing},
language = {English},
cr-category = {H.1 Models and Principles,
H.4 Information Systems Applications,
D.2 Software Engineering},
contact = {Dimka Karastoyanova},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {This work gives an overview of the future research challenges on enabling
technologies for service-based applications that have been identified in the
network of excellence S-Cube. Service-based applications comprise three layers:
business processes, service compositions and services and service
infrastructures. The goal of this work is to present a roadmap for future
research in technologies for software and system services.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2012-35&engl=1}
}
@inproceedings {INPROC-2012-29,
author = {Mirko Sonntag and Michael Hahn and Dimka Karastoyanova},
title = {{Mayflower - Explorative Modeling of Scientific Workflows with BPEL}},
booktitle = {Proceedings of the Demo Track of the 10th International Conference on Business Process Management (BPM 2012), CEUR Workshop Proceedings, 2012},
publisher = {CEUR Workshop Proceedings},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {1--5},
type = {Workshop Paper},
month = {September},
year = {2012},
keywords = {Scientific workflows; Model-as-you-go; SOA; BPEL},
language = {English},
cr-category = {H.4.1 Office Automation,
I.6.5 Model Development,
D.2.2 Software Engineering Design Tools and Techniques},
ee = {http://www.ceur-ws.org},
contact = {sonntag@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Using workflows for scientific calculations, experiments and simulations has
been a success story in many cases. Unfortunately, most of the existing
scientific workflow systems implement proprietary, non-standardized workflow
languages, not taking advantage of the achievements of the conventional
business workflow technology. It is only natural to combine these two research
branches in order to harness the strengths of both. In this demonstration, we
present Mayflower, a workflow environment that enables scientists to model
workflows on the fly using extended business workflow technology. It supports
the typical trial-and-error approach scientists follow when developing their
experiments, computations or simulations and provides scientist with all
crucial characteristics of the workflow technology. Additionally, beneficial to
the business stakeholders, Mayflower brings additional simplification in
workflow de-velopment and debugging.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2012-29&engl=1}
}
@inproceedings {INPROC-2012-16,
author = {David Schumm and Dimitrios Dentsas and Michael Hahn and Dimka Karastoyanova and Frank Leymann and Mirko Sonntag},
title = {{Web Service Composition Reuse through Shared Process Fragment Libraries}},
booktitle = {Proceedings of the 12th International Conference on Web Engineering (ICWE 2012 Demos)},
publisher = {Springer-Verlag},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
series = {Lecture Notes in Computer Science},
pages = {1--4},
type = {Workshop Paper},
month = {July},
year = {2012},
doi = {10.1007/978-3-642-31753-8_53},
keywords = {Process Reuse; Service Composition; Web Services; BPEL; Process Fragments.},
language = {English},
cr-category = {C.2.4 Distributed Systems,
D.2.2 Software Engineering Design Tools and Techniques,
H.3.5 Online Information Services,
H.4.1 Office Automation},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {More and more application functionality is provided for use over corporate and
public networks. Standardized technology stacks, like Web services, provide
abstraction from the internal implementation. Coarse-grained units of Web
service composition logic can be made reusable by capturing it as ‘process
fragment’. Such fragments can be shared over the Web to simplify and accelerate
development of process-based service compositions. In this demonstration, we
present a framework consisting of an Eclipse-based process design environment
that is integrated with a Web-based process fragment library. The framework
enables extracting process fragments, publishing and sharing them on the Web,
as well as search, retrieval, and their reuse in a given process. Process
fragments can be shared with others using a Web frontend or through a plug-in
within the process design environment which is building on Web service
technology.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2012-16&engl=1}
}
@inproceedings {INPROC-2011-77,
author = {Michael Reiter and Uwe Breitenb{\"u}cher and Schahram Dustdar and Dimka Karastoyanova and Frank Leymann and Hong-Linh Truong},
title = {{A Novel Framework for Monitoring and Analyzing Quality of Data in Simulation Workflows}},
booktitle = {2011 Seventh IEEE International Conference on eScience},
publisher = {IEEE},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
type = {Conference Paper},
month = {December},
year = {2011},
language = {English},
cr-category = {H.4.1 Office Automation,
I.6.7 Simulation Support Systems},
contact = {Michael Reiter Michael.Reiter@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {In recent years scientific workflows have been used for conducting
data-intensive and long running simulations. Such simulation workflows have
processed and produced different types of data whose quality has a strong
influence on the final outcome of simulations. Therefore being able to monitor
and analyze quality of this data during workflow execution is of paramount
importance, as detection of quality problems will enable us to control the
execution of simulations efficiently. Unfortunately, existing scientific
workflow execution systems do not support the monitoring and analysis of
quality of data for multi-scale or multi-domain simulations. In this paper, we
examine how quality of data can be comprehensively measured within workflows
and how the measured quality can be used to control and adapt running
workflows. We present a quality of data measurement process and describe a
quality of data monitoring and analysis framework that integrates this
measurement process into a workflow management system.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-77&engl=1}
}
@inproceedings {INPROC-2011-62,
author = {Michele Mancioppi and Olha Danylevych and Dimka Karastoyanova and Frank Leymann},
title = {{Towards Classification Criteria for Process Fragmentation Techniques}},
booktitle = {Proceedings of BPD 2011 (colocated with BPM 2011)},
publisher = {Springer Verlag},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
type = {Workshop Paper},
month = {December},
year = {2011},
keywords = {Process fragments, process fragmentation, process improvement techniques},
language = {English},
cr-category = {D.2.2 Software Engineering Design Tools and Techniques,
H.4.1 Office Automation},
contact = {michele.mancioppi@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Process fragmentation is the foundation of many state-of-the-art techniques for
supporting management, reuse and change of process models. Such techniques vary
greatly in terms of which types of processes they are applicable to, what they
aim at accomplishing, how they define the resulting process fragments, etc. The
comparison, analysis, reuse and selection of the available process
fragmentation techniques are hindered by the lack of a common terminology and
classification criteria, and by the large discrepancy in the characteristics
that are covered when presenting novel fragmentation techniques. This work
starts addressing this issue by investigating classification criteria for
process fragmentation techniques based on the “seven Ws”, namely Why, What,
When, Where, Who, Which, and hoW. The presented classification criteria are
applied to some of the process fragmentation approaches available in the
literature. In addition to enabling the classification of fragmentation
techniques, the classification criteria here presented form a “check-list” for
authors of future works in the field of process fragmentation.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-62&engl=1}
}
@inproceedings {INPROC-2011-56,
author = {Mirko Sonntag and Dimka Karastoyanova},
title = {{Enforcing the Repeated Execution of Logic in Workflows}},
booktitle = {Proceedings of the 1st International Conference on Business Intelligence and Technology (BUSTECH 2011), Rome, Italy, 2011},
publisher = {IARIA},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {1--6},
type = {Conference Paper},
month = {September},
year = {2011},
keywords = {Service composition; Workflow adaptability; Iteration; Re-execution},
language = {English},
cr-category = {H.4.1 Office Automation},
contact = {Mirko Sonntag: sonntag@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {The repeated execution of workflow logic is a feature needed in many
situations. Repetition of activities can be modeled with workflow constructs
(e.g., loops) or external workflow configurations, or can be triggered by a
user action during workflow execution. While the first two options are state of
the art in the workflow technology, the latter is currently insufficiently
addressed in literature and practice. We argue that a manually triggered rerun
operation enables both business users and scientists to react to unforeseen
problems and thus improves workflow robustness, allows scientists steering the
convergence of scientific results, and facilitates an explorative workflow
development as required in scientific workflows. In this paper, we therefore
formalize operations for the repeated enactment of activities—for both
iteration and re-execution. Starting point of the rerun is an arbitrary,
manually selected activity. Since we define the operations on a meta-model
level, they can be implemented for different workflow languages and engines.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-56&engl=1}
}
@inproceedings {INPROC-2011-52,
author = {Mirko Sonntag and Sven Hotta and Dimka Karastoyanova and David Molnar and Siegfried Schmauder},
title = {{Using Services and Service Compositions to Enable the Distributed Execution of Legacy Simulation Applications}},
booktitle = {Towards a Service-Based Internet, Proceedings of the 4th European Conference ServiceWave 2011, Poznan, Poland, 2011},
editor = {W. Abramowicz and I.M. Llorente and M. Surridge and A. Zisman and J. Vayssi{\`e}re},
publisher = {Springer-Verlag},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {1--12},
type = {Conference Paper},
month = {October},
year = {2011},
keywords = {Service compositions; Simulation workflows; distributed simulations; BPEL; Web services},
language = {English},
cr-category = {H.4.1 Office Automation,
I.6.7 Simulation Support Systems},
contact = {Mirko Sonntag sonntag@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {In the field of natural and engineering science, computer simulations play an
increasingly important role to explain or predict phenomena of the real world.
Although the software landscape is crucial to support scientists in their every
day work, we recognized during our work with scientific institutes that many
simulation programs can be considered legacy monolithic applications. They are
developed without adhering to known software engineering guidelines, lack an
acceptable software ergonomics, run sequentially on single workstations and
require tedious manual tasks. We are convinced that SOA concepts and the
service composition technology can help to improve this situation. In this
paper we report on the results of our work on the service- and service
composition-based re-engineering of a legacy scientific application for the
simulation of the ageing process in copper-alloyed. The underlying general
concept for a distributed, service-based simulation infrastructure is also
applicable to other scenarios. Core of the concept is a resource manager that
steers server work load and handles simulation data.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-52&engl=1}
}
@inproceedings {INPROC-2011-50,
author = {Mirko Sonntag and Dimka Karastoyanova},
title = {{Compensation of Adapted Service Orchestration Logic in BPEL’n’Aspects}},
booktitle = {Proceedings of the 9th International Conference on Business Process Management (BPM 2011), Clermont-Ferrand, France, 2011},
publisher = {Springer-Verlag},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {1--16},
type = {Conference Paper},
month = {August},
year = {2011},
keywords = {Workflow; Service Composition; BPEL; Compensation; Aspect-orientation; Adaptability},
language = {English},
cr-category = {H.4.1 Office Automation},
contact = {sonntag@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {BPEL’n’Aspects is a non-intrusive mechanism for adaptation of control flow of
BPEL processes based on the AOP paradigm. It relies on Web service standards to
weave process activities in terms of aspects into BPEL processes. This paper is
a logical continuation of the BPEL’n’Aspects approach. Its main objective is to
enable compensation of weaved-in Web service invocations (activities) in a
straightforward manner. We present (1) requirements on a mechanism for
compensation of weaved-in process activities; (2) the corresponding concepts
and mechanisms to meet these requirements; (3) an example scenario to show the
applicability of the approach; and (4) a prototypical implementation to prove
the feasibility of the solution. This work represents an improvement in the
applicability of this particular adaptation approach since processes in
production need the means to compensate actions that are included into
processes as result of an adaptation step, too. The concept is generic and
hence can also be used by other approaches that adapt control flow.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-50&engl=1}
}
@inproceedings {INPROC-2011-48,
author = {Mirko Sonntag and Katharina G{\"o}rlach and Dimka Karastoyanova and Frank Leymann and Polina Malets and David Schumm},
title = {{Views on Scientific Workflows}},
booktitle = {Proceedings of the 10th International Conference on Perspectives in Business Informatics Research (BIR 2011), 2011},
publisher = {Springer-Verlag},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
series = {Lecture Notes in Business Information Processing},
volume = {90},
pages = {321--335},
type = {Conference Paper},
month = {October},
year = {2011},
doi = {10.1007/978-3-642-24511-4_25},
keywords = {Process Views, BPEL, Web Services, SOA, Simulation Workflows, Scientific Workflows.},
language = {English},
cr-category = {H.4.1 Office Automation},
contact = {sonntag@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Workflows are becoming more and more important in e-Science due to the support
they provide to scientists in computer simulations, experiments and
calculations. Our experiences with workflows in this field and the literature
show that scientific workflows consist of a large number of related
information. This information is difficult to deal with in a single perspective
and has changing importance to scientists in the different workflow lifecycle
phases. In this paper we apply viewing techniques known from business process
management to (service-based) scientific workflows to address these issues. We
describe seven of the most relevant views and point out realization challenges.
We argue that the selected views facilitate the handling of workflows to
scientists and add further value to scientific workflow systems. An
implementation of a subset of the views based on Web services and BPEL shows
the feasibility of the approach. The presented work has the goal to increase
additionally the acceptance of the workflow technology in e-Science.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-48&engl=1}
}
@inproceedings {INPROC-2011-35,
author = {David Schumm and Jiayang Cai and Christoph Fehling and Dimka Karastoyanova and Frank Leymann and Monika Weidmann},
title = {{Composite Process View Transformation}},
booktitle = {Proceedings of the 12th International Conference on Electronic Commerce and Web Technologies},
publisher = {Springer-Verlag},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
series = {Lecture Notes in Business Information Processing},
volume = {85},
pages = {52--63},
type = {Conference Paper},
month = {August},
year = {2011},
isbn = {978-3-642-23013-4},
doi = {10.1007/978-3-642-23014-1_5},
keywords = {Process View, Service Composition, BPM},
language = {English},
cr-category = {C.2.4 Distributed Systems,
D.2.2 Software Engineering Design Tools and Techniques,
H.4.1 Office Automation},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {The increasing complexity of processes used for design and execution of
critical business activities demands novel techniques and technologies. Process
viewing techniques have been proposed as a means to abstract from details,
summarize and filter out information, and customize the visual appearance of a
process to the need of particular stakeholders. However, composition of process
view transformations and their provisioning as a service to enable their usage
in various different scenarios is currently not discussed in research. In this
paper, we present a lightweight, service-oriented approach to compose modular
process viewing functions to form complex process view transformations which
can be offered as a service. We introduce a concept and an architectural
framework to generate process view service compositions automatically with
focus on usability. Furthermore, we discuss key aspects regarding the
implementation as well as different scenarios where process view services and
their compositions are needed.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-35&engl=1}
}
@inproceedings {INPROC-2011-28,
author = {Mirko Sonntag and Sven Hotta and Dimka Karastoyanova and David Molnar and Siegfried Schmauder},
title = {{Workflow-Based Distributed Environment For Legacy Simulation Applications}},
booktitle = {Proceedings of the 6th International Conference on Software and Data Technologies (ICSOFT 2011), Poster Paper},
publisher = {SciTePress Digital Library},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {91--94},
type = {Workshop Paper},
month = {July},
year = {2011},
doi = {10.5220/0003444400910094},
keywords = {Simulation workflows; distributed simulations; BPEL; Web services; Monte-Carlo},
language = {English},
cr-category = {H.4.1 Office Automation,
I.6.7 Simulation Support Systems},
contact = {Mirko.Sonntag@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Computer simulations play an increasingly important role to explain or predict
phenomena of the real world. We recognized during our work with scientific
institutes that many simulation programs can be considered legacy applications
with low software ergonomics, usability, and hardware support. Often there is
no GUI and tedious manual tasks have to be conducted. We are convinced that the
information technology and software engineering concepts can help to improve
this situation to a great extent. In this poster presentation we therefore
propose a concept of a simulation environment for legacy scientific
applications. Core of the concept are simulation workflows that enable a
distributed execution of former monolithic programs and a resource manager that
steers server work load and handles data. As proof of concept we implemented a
Monte-Carlo simulation of precipitations in copper-alloyed iron and tested it
with real data.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-28&engl=1}
}
@inproceedings {INPROC-2011-12,
author = {Mirko Sonntag and Dimka Karastoyanova},
title = {{Concurrent Workflow Evolution}},
booktitle = {Electronic Communications of the EASST, Volume 37, ISSN 1863-2122},
publisher = {Gesellschaft f{\"u}r Informatik e.V. (GI)},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {1--12},
type = {Workshop Paper},
month = {March},
year = {2011},
issn = {1863-2122},
keywords = {Workflow evolution; scientific workflows; Model-as-you-go; BPEL},
language = {English},
cr-category = {H.4.1 Office Automation},
contact = {Mirko.Sonntag@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Workflow evolution is a collective term for concepts that deal with changes of
workflow models. Adapted workflow models are deployed on a workflow engine as
new model version. That means two versions of the same model are deployed on
the engine. Typically, this results in conflicts between the workflow models.
For example, how does a client find and choose the desired workflow version to
instantiate? Typically, these problems are solved by deactivating the old
model. New instances can only be created for the new model. In our work on
scientific workflows we recognized that there are cases where it is desired to
keep the old model activated. In this paper we investigate what it means to
have several model versions active. We develop a general concept for this
“concurrent workflow evolution” that solves emerging problems. Moreover, we
show how this concept can be realized with BPEL.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-12&engl=1}
}
@inproceedings {INPROC-2011-07,
author = {Peter Reimann and Michael Reiter and Holger Schwarz and Dimka Karastoyanova and Frank Leymann},
title = {{SIMPL - A Framework for Accessing External Data in Simulation Workflows}},
booktitle = {Datenbanksysteme f{\"u}r Business, Technologie und Web (BTW 2011), 14. Fachtagung des GI-Fachbereichs „Datenbanken und Informationssysteme“ (DBIS), Proceedings, 02.-04. M{\"a}rz 2011, Kaiserslautern, Germany},
editor = {Gesellschaft f{\"u}r Informatik (GI)},
publisher = {Lecture Notes in Informatics (LNI)},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
series = {Series of the Gesellschaft f{\"u}r Informatik (GI)},
volume = {180},
pages = {534--553},
type = {Conference Paper},
month = {March},
year = {2011},
isbn = {978-3-88579-274-1},
keywords = {Data Provisioning; Workflow; Scientific Workflow; Simulation Workflow; BPEL; WS-BPEL; SIMPL},
language = {English},
cr-category = {H.2.8 Database Applications,
H.4.1 Office Automation},
contact = {Peter Reimann Peter.Reimann@ipvs.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Applications of Parallel and Distributed Systems;
University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Adequate data management and data provisioning are among the most important
topics to cope with the information explosion intrinsically associated with
simulation applications. Today, data exchange with and between simulation
applications is mainly accomplished in a file-style manner. These files show
proprietary formats and have to be transformed according to the specific needs
of simulation applications. Lots of effort has to be spent to find appropriate
data sources and to specify and implement data transformations. In this paper,
we present SIMPL – an extensible framework that provides a generic and
consolidated abstraction for data management and data provisioning in
simulation workflows. We introduce extensions to workflow languages and show
how they are used to model the data provisioning for simulation workflows based
on data management patterns. Furthermore, we show how the framework supports a
uniform access to arbitrary external data in such workflows. This removes the
burden from engineers and scientists to specify low-level details of data
management for their simulation applications and thus boosts their
productivity.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2011-07&engl=1}
}
@inproceedings {INPROC-2010-95,
author = {Ralph Mietzner and Christoph Fehling and Dimka Karastoyanova and Frank Leymann},
title = {{Combining Horizontal and Vertical Composition of Services}},
booktitle = {Proceedings of IEEE International Conference on Service-Oriented Computing and Applications (SOCA 2010)},
publisher = {IEEE},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
type = {Conference Paper},
month = {December},
year = {2010},
keywords = {service composition; vertical composition; cloud; provisioning; virtual service},
language = {English},
cr-category = {H.4.1 Office Automation},
contact = {Ralph Mietzner},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Service composition is a well-established field of research in the service
community. Services are commonly regarded as black boxes with well-defined
interfaces that can be recursively aggregated into new services. The black-box
nature of services does not only include the service implementation but also
the middleware and hardware to run the services. Thus, service composition
techniques are typically limited to choosing between a set of available
services. In this paper we keep the black-box nature and the principle of
information hiding for the service implementation, but break up services
vertically. By introducing vertical service composition, we allow services to
be provisioned on the right middleware when they are requested, thus making
service-binding more powerful as services with the desired quality of service
can be provisioned on demand. We introduce the concept of vertical service
composition and present an extension to an enterprise service bus that
implements the concept of vertical service composition by combining concepts
from provisioning with those of (dynamic) service binding.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2010-95&engl=1}
}
@inproceedings {INPROC-2010-85,
author = {Mirko Sonntag and Dimka Karastoyanova},
title = {{BPEL’n’Aspects And Compensation: Adapted Service Orchestration Logic and its Compensation Using Aspects}},
booktitle = {Proceedings of the 8th Int. Conf. on Service-Oriented Computing (ICSOC 2010), Demo Track, 2010},
editor = {Mathias Weske and Jian Yang and Paul Maglio and Marcelo Fantinato},
publisher = {Springer},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {1--2},
type = {Workshop Paper},
month = {December},
year = {2010},
keywords = {Service orchestration; BPEL; compensation; aspect-orientation; adaptability},
language = {English},
cr-category = {H.4.1 Office Automation},
contact = {sonntag@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {One of the main weaknesses of workflow management systems is their
inflexibility regarding process changes. To address this drawback in our work
on the BPEL’n’Aspects approach we developed a standards-based mechanism to
adapt the control flow of BPEL processes [1]. It uses AOP techniques to
non-intrusively weave Web service invocations in terms of aspects into BPEL
processes. Aspects can be inserted before, instead or after BPEL elements and
that way adaptation of running processes is enabled. In this work we want to
present a novel extension of the BPEL’n’Aspects prototype that deals with the
compensation of weaved-in aspects in a straight-forward manner. The extension
enormously improves the applicability of the approach in real-world scenarios:
processes in production need the means to compensate behavior that was inserted
into the process in the course of adaptation steps. The ability to compensate
weaved-in aspects distinguishes our approach from other existing concepts that
introduce AOP techniques to business processes.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2010-85&engl=1}
}
@inproceedings {INPROC-2010-84,
author = {Mirko Sonntag and Dimka Karastoyanova and Ewa Deelman},
title = {{BPEL4Pegasus: Combining Business and Scientific Workflows}},
booktitle = {Proceedings of the 8th Int. Conf. on Service-Oriented Computing (ICSOC 2010), Demo Track, 2010},
editor = {Mathias Weske and Jian Yang and Paul Maglio and Marcelo Fantinato},
publisher = {Springer},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {1--2},
type = {Workshop Paper},
month = {December},
year = {2010},
keywords = {Scientific workflows; business workflows; human tasks; Pegasus; BPEL},
language = {English},
cr-category = {H.4.1 Office Automation},
contact = {sonntag@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Business and scientific workflow management systems (WfMS) offer different
features to their users because they are developed for different application
areas with different requirements. Research is currently being done to extend
business WfMSs by functionality that meets requirements of scientists and
scientific applications. The idea is to bring the strengths of business WfMSs
to e-Science. This means great effort in re-implementing features already
offered by scientific WfMSs. In our work, we investigated another approach,
namely combining business and scientific workflows and thus harnessing the
advantages of both. We demonstrate a prototype that implements this idea with
BPEL as business workflow language and Pegasus as scientific WfMS. Our
motivation is the fact that the manual work to correctly install and configure
Pegasus can be supervised by a BPEL workflow to minimize sources of failures
and automate the overall process of scientific experimenting.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2010-84&engl=1}
}
@inproceedings {INPROC-2010-77,
author = {Philipp Leitner and Branimir Wetzstein and Dimka Karastoyanova and Waldemar Hummer and Schahram Dustdar and Frank Leymann},
title = {{Preventing SLA Violations in Service Compositions Using Aspect-Based Fragment Substitution}},
booktitle = {Proceedings of the 8th International Conference on Service Oriented Computing (ICSOC 2010)},
publisher = {Springer Berlin Heidelberg},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
type = {Conference Paper},
month = {December},
year = {2010},
language = {English},
cr-category = {H.4.1 Office Automation},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {In this paper we show how the application of the aspect-oriented programming
paradigm to runtime adaptation of service compositions can be used to prevent
SLA violations. Adaptations are triggered by predicted violations, and are
implemented as substitutions of fragments in the service composition. Fragments
are full-fledged standalone compositions, and are linked into the original
composition via special activities, which we refer to as virtual activities.
Before substitution we evaluate fragments with respect to their expected impact
on the performance of the composition, and choose those fragments which are
best suited to prevent a predicted violation. We show how our approach can be
implemented using Windows Workflow Foundation technology, and discuss our work
based on an illustrative case study.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2010-77&engl=1}
}
@inproceedings {INPROC-2010-52,
author = {David Schumm and Dimka Karastoyanova and Frank Leymann and Steve Strauch},
title = {{Fragmento: Advanced Process Fragment Library}},
booktitle = {Proceedings of the 19th International Conference on Information Systems Development (ISD'10), Prague, Czech Republic, August 25 - 27, 2010},
publisher = {Springer},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {659--670},
type = {Conference Paper},
month = {August},
year = {2010},
isbn = {978-1-4419-9645-9},
keywords = {Process Fragment; Process Design; Reusability; Process Library},
language = {English},
cr-category = {H.4.1 Office Automation,
D.3.3 Programming Language Constructs and Features},
contact = {David.Schumm@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Reuse is a common discipline for decreasing software development time and for
improving overall quality, independent from the domain. As business processes
represent a fundamental asset of an organization, several concepts for enabling
reuse during process modeling have been proposed. However, only few concrete
examples for reusable process artifacts have been discussed so far. In this
paper, we present the concept of process fragments and an example collection of
process fragments for illustrating our reuse concept and for showing that it
can ac-tually be applied in practice for an easier and faster development of
process-based applications. The fragment examples demonstrate different
characteristics such fragments may exhibit. We also argue that this work will
encourage reuse of process logic in terms of fragments since it also provides
an opportunity to design and develop a process fragment library for collecting
process logic explicitly. As technical enabler for the approach we present a
prototype called Fragmento.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2010-52&engl=1}
}
@inproceedings {INPROC-2010-26,
author = {Mirko Sonntag and Natalia Currle-Linde and Katharina G{\"o}rlach and Dimka Karastoyanova},
title = {{Towards Simulation Workflows With BPEL: Deriving Missing Features From GriCoL}},
booktitle = {Proceedings of the 21st IASTED International Conference on Modelling and Simulation (MS 2010), 2010.},
editor = {R.S. Alhajj and V.C.M. Leung and M. Saif and R. Thring},
publisher = {ACTA Press},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
type = {Conference Paper},
month = {July},
year = {2010},
keywords = {Simulation tools and languages; Workflow management; BPEL; GriCoL},
language = {English},
cr-category = {H.4.1 Office Automation,
H.3.4 Information Storage and Retrieval Systems and Software},
contact = {mirko.sonntag@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {In this paper, we investigate the suitability of the generalpurpose workflow
language BPEL to create executable simulation workflows. We therefore compare
BPEL to GriCoL, a graphical language with proven applicability for simulation
workflows in Grid environments. We discover a number of incomparable concepts
in the two languages. On the one hand, BPEL’s unique features in comparison to
GriCoL reveal the rationale behind the approach of using BPEL as basis for a
simulation workflow language. On the other hand, based on the features of
GriCoL, we are able to discuss how to extend BPEL in order to increase its
expressiveness for simulation workflows.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2010-26&engl=1}
}
@inproceedings {INPROC-2010-23,
author = {Mirko Sonntag and Dimka Karastoyanova},
title = {{Next Generation Interactive Scientific Experimenting Based On The Workflow Technology}},
booktitle = {Proceedings of the 21st IASTED International Conference on Modelling and Simulation (MS 2010), 2010.},
editor = {R.S. Alhajj and V.C.M. Leung and M. Saif and R. Thring},
publisher = {ACTA Press},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
type = {Conference Paper},
month = {July},
year = {2010},
keywords = {Simulation tools and languages; Workflow management; Workflow adaptation; SOA},
language = {English},
cr-category = {H.4.1 Office Automation,
H.3.4 Information Storage and Retrieval Systems and Software},
contact = {mirko.sonntag@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {In this paper we explore to what extent the conventional workflow technology
and service-oriented architecture (SOA) principles can be applied to support
scientist in their experiments. Based on the requirements imposed on systems
for scientific computing, e-Science and simulations, and an extended workflow
life cycle we introduce the architecture of an interactive system that reuses
the conventional workflow technology. We advocate the realization of this
workflow system with advanced adaptation and monitoring features because we
identified that modeling of scientific applications and simulations can only be
done the “scientists’ way” if the traditional workflow modeling as well as
design and run time adaptation are combined in a user-friendly solution.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2010-23&engl=1}
}
@inproceedings {INPROC-2010-115,
author = {Mirko Sonntag and Dimka Karastoyanova and Ewa Deelman},
title = {{Bridging The Gap Between Business And Scientific Workflows}},
booktitle = {Proceedings of the IEEE 6th International Conference on e-Science, Brisbane, Australia, December 7-10, 2010},
publisher = {IEEE Computer Society},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {206--213},
type = {Conference Paper},
month = {December},
year = {2010},
doi = {10.1109/eScience.2010.12},
keywords = {Scientific workflows; Business workflows; Human tasks; Pegasus; BPEL},
language = {English},
cr-category = {H.4.1 Office Automation},
contact = {sonntag@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Due to their different target applications business and scientific workflow
systems provide different sets of features to their users. Significant amount
of research is currently being done to employ the business workflow technology
in the scientific domain. This usually means extending the workflow language
and thus the modeling tool and execution engine. In this paper we aim to bring
business and scientific workflows together in order to exploit the advantages
of both. We explore the interplay between business and scientific workflows in
the context of human interactions with the management of workflow execution. We
present an approach and implementation based on BPEL and Pegasus and show that
the approach can be beneficial to scientists.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2010-115&engl=1}
}
@inproceedings {INPROC-2010-10,
author = {Andreas Gehlert and Olha Danylevych and Dimka Karastoyanova},
title = {{From Requirements to Executable Processes - A Literature Study.}},
booktitle = {In Proceedings of the 5th International Workshop on Business Process Design (BPD 2009), Ulm, Germany, 7 September 2009},
publisher = {BPD'09},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {1--11},
type = {Workshop Paper},
month = {January},
year = {2010},
keywords = {Requirement Engineering, Business Process Modelling, Process Merge},
language = {English},
cr-category = {D.2.2 Software Engineering Design Tools and Techniques,
D.2.13 Software Engineering Reusable Software,
H.4.1 Office Automation},
contact = {olha.danylevych@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Service compositions are a major component to realize service-based
applications (SBAs). The design of these service compositions follows mainly a
process-modelling approach - an initial business process is refined until it
can be executed on a workflow engine. Although this process-modelling approach
proved to be useful, it largely disregards the knowledge gained in the
requirements engineering discipline, e. g. in eliciting, documenting, managing
and tracing requirements. Disregarding the requirements engineering phase may
lead to undesired effects of the later service compositions such as lack of
acceptance by the later users. To defuse this potentially critical issue we are
interested in the interplay between requirements engineering and process
modelling techniques. As a first step in this direction, we analyse the current
literature in requirements engineering and process modelling in order to find
overlaps where the techniques from both domains can be combined in useful ways.
Our main finding is that scenario-based approaches from the requirements
engineering discipline are a good basis for deriving executable processes.
Depending whether the focus is on requirements engineering or on process design
the inte-gration of the techniques are slightly different.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2010-10&engl=1}
}
@inproceedings {INPROC-2010-09,
author = {Mirko Sonntag and Dimka Karastoyanova and Frank Leymann},
title = {{The Missing Features of Workflow Systems for Scientific Computations}},
booktitle = {Proceedings of the 3rd Grid Workflow Workshop (GWW), Software Engineering Conference, GI-Edition Lecture Notes in Informatics (LNI), P-160},
publisher = {Gesellschaft f{\"u}r Informatik e.V. (GI)},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {209--216},
type = {Workshop Paper},
month = {February},
year = {2010},
isbn = {978-3-88579-254-3},
keywords = {Business Workflow Management, Scientific Workflow Management},
language = {English},
cr-category = {H.4.1 Office Automation},
contact = {Mirko.Sonntag@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {This paper discusses technical aspects of how business workflow management
systems can be improved in order to apply them in the field of scientific
workflows and reap all their benefits. We give recommendations how to address
the discovered gaps in support for scientific applications. The approach we
follow addresses the requirements of scientists and scientific applications,
which we also identify in this work.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2010-09&engl=1}
}
@inproceedings {INPROC-2010-01,
author = {Branimir Wetzstein and Dimka Karastoyanova and Oliver Kopp and Frank Leymann and Daniel Zwink},
title = {{Cross-Organizational Process Monitoring based on Service Choreographies}},
booktitle = {Proceedings of the 25th Annual ACM Symposium on Applied Computing (SAC 2010); Sierre, Switzerland, 21-26 March, 2010},
publisher = {ACM},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {2485--2490},
type = {Conference Paper},
month = {March},
year = {2010},
doi = {10.1145/1774088.1774601},
keywords = {Business Activity Monitoring, Cross-Organizational Monitoring, Service Choreography},
language = {English},
cr-category = {H.4.1 Office Automation},
contact = {branimir.wetzstein@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Business process monitoring in the area of service oriented computing is
typically performed using business activity monitoring technology in an
intra-organizational setting. Due to outsourcing and the increasing need for
companies to work together to meet their joint customer demands, there is a
need for monitoring of business processes across organizational boundaries.
Thereby, partners in a choreography have to exchange monitoring data, in order
to enable process tracking and evaluation of process metrics. In this paper, we
describe an event-based monitoring approach based on BPEL4Chor service
choreography descriptions. We show how to define monitoring agreements
specifying events each partner in the choreography has to provide. We
distinguish between resource events and complex events for calculation of
process metrics using complex event processing technology. We present our
implementation and evaluate the concepts based on a scenario.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2010-01&engl=1}
}
@inproceedings {INPROC-2009-82,
author = {Raman Kazhamiakin and Branimir Wetzstein and Dimka Karastoyanova and Marco Pistore and Frank Leymann},
title = {{Adaptation of Service-Based Applications Based on Process Quality Factor Analysis}},
booktitle = {Proceedings of the 2nd Workshop on Monitoring, Adaptation and Beyond (MONA+), co-located with ICSOC/ServiceWave 2009},
publisher = {Online},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
type = {Workshop Paper},
month = {November},
year = {2009},
language = {English},
cr-category = {H.4.1 Office Automation},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {When service-based applications implement business processes, it is important
to monitor their performance in terms of Key Performance Indicators (KPIs). If
monitoring results show that the KPIs do not reach target values, the
influential factors have to be analyzed and corresponding adaptation actions
have to be taken. In this paper we present a novel adaptation approach for
service-based applications (SBAs) based on a process quality factor analysis.
This approach uses decision trees for showing the dependencies of KPIs on
process quality factors from different functional levels of an SBA. We extend
the monitoring and analysis approach and show how the analysis results may be
used to come up with an adaptation strategy leading to an SBA that satisfies
KPI values. The approach includes creation of a model which associates
adaptation actions to process quality metrics, extraction of adaptation
requirements based on analysis results, and identification of an adaptation
strategy which can consist of several adaptation actions on different
functional levels of an SBA.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2009-82&engl=1}
}
@inproceedings {INPROC-2009-76,
author = {Tobias Anstett and Dimka Karastoyanova and Frank Leymann and Ralph Mietzner and Ganna Monakova and Daniel Schleicher and Steve Strauch},
title = {{MC-Cube: Mastering Customizable Compliance in the Cloud}},
booktitle = {Proceedings of the 7th International Joint Conference on Service Oriented Computing, Stockholm, Sweden, November 23-27, 2009},
editor = {Springer},
publisher = {Springer Verlag},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {592--606},
type = {Conference Paper},
month = {November},
year = {2009},
keywords = {Cloud Computing; IaaS; PaaS; SaaS; Monitoring; Enforcement},
language = {English},
cr-category = {H.2.7 Database Administration},
contact = {anstett@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Outsourcing parts of a company's processes becomes more and more important in a
globalized, distributed economy. While archi- tectural styles and technologies
such as service-oriented architecture and Web services facilitate the
distribution of business process over several departments, enterprises and
countries, these business processes still need to comply with various
regulations. These regulations can be company regulations, national, or
international regulations. When outsourcing IT-functions, enterprises must
ensure that the overall regulations are met. Therefore they need evidence from
their outsourcing partners that supports the proof of compliance to
regulations. Furthermore it must be possible to enforce the adherence to
compliance rules at partners. In this paper we introduce so-called compliance
interfaces that can be used by customers to subscribe to evidence at a provider
and to enforce regulations at a provider. We introduce a general compliance
architecture that allows compliance to be monitored and enforced at services
deployed in any emerging cloud delivery model.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2009-76&engl=1}
}
@inproceedings {INPROC-2009-54,
author = {Dimka Karastoyanova and Frank Leymann},
title = {{BPEL’n’Aspects: Adapting Service Orchestration Logic}},
booktitle = {Proceedings of 7th International Conference on Web Services (ICWS 2009)},
address = {Los Angeles, CA, USA},
publisher = {IEEE},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
type = {Conference Paper},
month = {July},
year = {2009},
doi = {10.1109/ICWS.2009.75},
language = {English},
cr-category = {H.4.1 Office Automation},
contact = {dimka.karastoyanova@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {The need for flexibility in process-based applications, in particular during
their execution, places the demand for enabling adaptability of processes. AOP
is considered to be one of the approaches to flexibly switch on and off
functionality on per-instance basis in applications during their execution;
analogously, this paradigm can be applied in a BPEL environment to enable
adaptation of running orchestrations. In the presented approach we strive
towards reuse of as much concepts and technology already available in a Web
service (WS) environment as possible. We combine standard BPEL, the
publish/subscribe paradigm and WS-Policy so that WS operations play the role of
aspects with respect to BPEL processes. We present the syntax for such aspects
as an extension of the WS-Policy framework. We introduce the architecture of
the supporting infrastructure and a prototypical implementation. The approach
draws on the combined benefits of service orientation and the AOP paradigm to
improve the state-of-the-art techniques for flexibility of service
orchestrations in a non-intrusive manner.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2009-54&engl=1}
}
@inproceedings {INPROC-2009-40,
author = {Ralph Mietzner and Tammo van Lessen and Alexander Wiese and Matthias Wieland and Dimka Karastoyanova and Frank Leymann},
title = {{Virtualizing Services and Resources with ProBus: The WS-Policy-Aware Service and Resource Bus}},
booktitle = {Proceedings of the 7th International Conference on Web Services (ICWS) 2009},
publisher = {IEEE Computer Society},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
type = {Conference Paper},
month = {July},
year = {2009},
keywords = {WS-Policy; WSRF; Enterprise Service Bus; ESB; Service Selection},
language = {English},
cr-category = {H.4.1 Office Automation},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {A fundamental principle of service oriented architectures is the decoupling of
service requesters and service providers to enable late binding of services at
deployment time or even dynamic binding of services at runtime. This is
important in enterprise settings, where different services that implement
business functions in critical business processes are dynamically chosen based
on availability or price. The same problem also applies to dynamic Grid
environments where resources need to be dynamically chosen based on
availability and other non-functional properties. The WS-Policy framework
describes how policies for both providers and requesters are specified to allow
the selection of services based on these policies. Existing approaches, using
WS-Policy, have drawbacks by placing the burden of the service selection
partially on the client. In this paper we present an approach to extend an
enterprise service bus that allows service clients to submit policies the
service provider needs to comply with directly in the message that triggers the
service invocation. We show how these policies are evaluated in the bus and how
policies are defined for not only stateless services, but also stateful
resources.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2009-40&engl=1}
}
@inproceedings {INPROC-2009-27,
author = {David Schumm and Dimka Karastoyanova and Frank Leymann and J{\"o}rg Nitzsche},
title = {{On Visualizing and Modelling BPEL with BPMN}},
booktitle = {IEEE Proceedings of the 4th International Workshop on Workflow Management (IWWM2009)},
editor = {Henning M{\"u}ller and Jinjun Chen and Massimo Cafaro and Jong Hyuk Park and Nabil Abdennadher},
address = {Los Alamitos, California},
publisher = {IEEE Computer Society},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {80--87},
type = {Workshop Paper},
month = {May},
year = {2009},
isbn = {978-0-7695-3677-4},
keywords = {BPEL; BPMN; Modelling; Visualizing},
language = {English},
cr-category = {D.2.2 Software Engineering Design Tools and Techniques,
H.4.1 Office Automation},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {The advantages of the process-based approach to implementing applications lead
to the development of notations for modelling business processes and languages
for enacting them in a process engine for the purpose of process automation.
Currently the Business Process Modeling Notation (BPMN) is typically used for
modelling business processes and the Business Process Execution Language (BPEL)
is used as the process execution format. Both languages differ in purpose,
expressivity and operational semantics. Recently it has been shown that there
is no complete bi-directional mapping between BPMN and BPEL and transformations
have been defined between the two formalisms. However, these transformations
lead to more complex models in both, BPEL and BPMN, and enable a roundtrip for
only a limited number of scenarios. In this paper we show how BPEL processes
can be modelled using the graphical aspect of BPMN in order to facilitate
modelling of executable processes using BPMN while avoiding model
transformations.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2009-27&engl=1}
}
@inproceedings {INPROC-2009-25,
author = {Tammo van Lessen and J{\"o}rg Nitzsche and Dimka Karastoyanova},
title = {{Facilitating Rich Data Manipulation in BPEL using E4X}},
booktitle = {Proceedings of the 1st Central-European Workshop on Services and their Composition, ZEUS 2009, Stuttgart, Germany, March 2--3, 2009},
editor = {Oliver Kopp and Niels Lohmann},
address = {Stuttgart},
publisher = {CEUR-WS.org},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
series = {CEUR Workshop Proceedings},
volume = {438},
pages = {102--108},
type = {Workshop Paper},
month = {March},
year = {2009},
issn = {1613-0073},
keywords = {WS-BPEL; BPEL; JavaScript; E4X; ECMAScript; XML},
language = {English},
cr-category = {H.4.1 Office Automation},
ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2009-25/INPROC-2009-25.pdf},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {The Business Process Execution Language (BPEL) uses XML to specify the data
used within a process and realizes data flow via (globally) shared variables.
Additionally, assign activities can be used to copy (parts of) variables to
other variables using techniques like XPath or XSLT. Although BPEL’s built-in
functionality is sufficient for simple data manipulation tasks, it becomes very
cumbersome when dealing with more sophisticated data models, such as arrays.
ECMAScript for XML (E4X) extends JavaScript with support for XML-based data
manipulation by introducing new XPath-like language features. In this paper we
show how E4X can help to significantly ease data manipulation tasks and propose
a BPEL extension that allows employing JavaScript/E4X for implementing them. As
E4X allows defining custom functions in terms of scripts, reusability with
respect to data manipulation is improved. To verify the conceptual framework we
present a proof-of-concept implementation based on Apache ODE.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2009-25&engl=1}
}
@inproceedings {INPROC-2009-19,
author = {Olha Danylevych and Dimka Karastoyanova and Frank Leymann},
title = {{Optimal Stratification of Transactions}},
booktitle = {ICIW 2009},
publisher = {IEEE Computer Society},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
type = {Conference Paper},
month = {May},
year = {2009},
language = {English},
cr-category = {H.4.1 Office Automation},
ee = {www.iaria.org/conferences2009/ICIW09.html},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {The performance of a system (implementing business processes) is directly
influenced by the way its operations are split into transactions. Stratified
transactions a produced by the stratification approach presented in this paper
and is a way to manage a global transaction by combining the transactions
coordinated using the tho-phase commit protocol (2PC) and queued transactions.
In the presented stratification approach the sub-transactions are partitioned
into the so-called strata which employ 2PC for transaction coordination, and
the strata communicate via persistent queues. This paper investigates the
mechanisms for building an optimally stratified transaction regarding certain
evaluation criteria. We investigate the applicability of algorithms for local
search like the hillclimbing and simulated annealing for transaction
stratification, and introduce a hybrid method combining both approaches to
tackle its disadvantage. We also used the population-based optimization
approach (evolutionary programming). We produce recommendations for use of all
the approaches depending on the optimization criteria. The approach can be
applied for fragmenting workflow-based service compositions in an optimal
manner and thus support the out-sourcing and insourcing scenarios.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2009-19&engl=1}
}
@inproceedings {INPROC-2009-14,
author = {Andreas Gehlert and Julia Hielscher and Olha Danylevych and Dimka Karastoyanova},
title = {{Online Testing, Requirements Engineering and Service Faults as Drivers for Adapting Service Compositions}},
booktitle = {ServiceWave 2008, MONA+},
publisher = {Springer Berlin Heidelberg},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
type = {Workshop Paper},
month = {February},
year = {2009},
keywords = {Service Composition, Adaptability, Requirements Engineering, Online Testing, Self-optimization, Web Services},
language = {English},
cr-category = {H.4.1 Office Automation},
ee = {http://www.s-cube-network.eu/MONA},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Adaptability is a key feature of service-based applications (SBAs). Multiple
approaches for adaptability, including those borrowed from the tradi-tional
workflow technology, can be used to react to various types of changes in the
SBA’s environment. Unlike previous fragmented research, we aim at pre-senting a
unified view reflecting the convergence of approaches from require-ments
engineering, online testing and adaptation mechanisms for service
com-positions. The main result of our approach is that a dynamic binding
strategy known from service composition research leads to an interaction of the
re-quirements engineering and online testing activities with an enterprise
service registry only and, therefore, to a loose coupling between the three
activities.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2009-14&engl=1}
}
@inproceedings {INPROC-2009-02,
author = {Thorsten Scheibler and Dimka Karastoyanova and Frank Leymann},
title = {{Dynamic Message Routing Using Processes}},
booktitle = {Proceedings of 16th Fachtagung Kommunikation in Verteilten Systemen (KiVS 09)},
publisher = {Springer},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
type = {Conference Paper},
month = {March},
year = {2009},
keywords = {SOAP, Routing, BPEL, ESB, SOA},
language = {English},
cr-category = {D.2.2 Software Engineering Design Tools and Techniques,
D.2.11 Software Engineering Software Architectures,
D.2.13 Software Engineering Reusable Software},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {The Enterprise Service Bus (ESB) is composable middleware that provides
applications with services such as message routing and transformation, service
compositions, dynamic discovery, transactional support, coordination, security
features, and others. In an ESB supporting SOAP message exchange routing
algorithms typically follow the sequential SOAP message processing model, where
SOAP headers are the main artefacts used to specify the message route and the
processing of the payload by intermediaries along that route. This model
supports neither alternative nor parallel message routes. In the case of a
failing intermediary node this leads to a failure in the message delivery.
Moreover, the execution order of services on SOAP message payloads at the
intermediaries cannot be prescribed. In this paper, we demonstrate how the
deficiencies of the SOAP message processing model can be addressed. We
introduce an approach that allows for specifying SOAP message routing logic in
terms of BPEL processes. We show that parallel and alternative routes for SOAP
messages can be modelled and executed, and the order of services that process a
message at intermediaries can be predefined to accommodate the correct
processing sequence, as required by the concrete application domain. Features
like dynamic discovery of services and flexible service composition are
leveraged to enable flexible SOAP message routing.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2009-02&engl=1}
}
@inproceedings {INPROC-2008-72,
author = {Oliver Kopp and Branimir Wetzstein and Ralph Mietzner and Stefan Pottinger and Dimka Karastoyanova and Frank Leymann},
title = {{A Model-Driven Approach to Implementing Coordination Protocols in BPEL}},
booktitle = {1st International Workshop on Model-Driven Engineering for Business Process Management (MDE4BPM 2008)},
publisher = {Springer-Verlag},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
series = {Lecture Notes in Business Information Processing},
volume = {17},
pages = {188--199},
type = {Workshop Paper},
month = {September},
year = {2008},
doi = {10.1007/978-3-642-00328-8_19},
keywords = {MDA; BPEL; WS-Coordination; WS-Business Activity},
language = {English},
cr-category = {H.4.1 Office Automation,
K.4.4 Electronic Commerce},
ee = {http://www.inf.unisi.ch/mde4bpm08/},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {WS-Coordination defines a framework for establishing pro- tocols for
coordinating the outcome agreement within distributed ap- plications. The
framework is extensible and allows support for multiple coordination protocols.
To facilitate the realization of new coordination protocols we present a
model-driven approach for the generation of BPEL processes used as
implementation of coordination protocols. We show how coordination protocols
can be modeled in domain-specific graph-based diagrams and how to transform
such graphs into abstract BPEL process models representing the behavior of the
coordinator and the participants in the protocol.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2008-72&engl=1}
}
@inproceedings {INPROC-2008-47,
author = {Carlos Pedrinaci and Christian Brelage and Tammo van Lessen and John Domingue and Dimka Karastoyanova and Frank Leymann},
title = {{Semantic Business Process Management: Scaling up the Management of Business Processes}},
booktitle = {Proceedings of the 2nd IEEE International Conference on Semantic Computing (ICSC) 2008},
publisher = {IEEE Computer Society},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {546--553},
type = {Conference Paper},
month = {August},
year = {2008},
language = {English},
cr-category = {H.4.1 Office Automation},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Business Process Management (BPM) aims at supporting the whole life-cycle
necessary to deploy and maintain business processes in organisations. Despite
its success however, BPM suffers from a lack of automation that would support a
smooth transition between the business world and the IT world. We argue that
Semantic BPM, that is, the enhancement of BPM with Semantic Web Services
technologies, provides further scalability to BPM by increasing the level of
automation that can be achieved. We describe the particular SBPM approach
developed within the SUPER project and we illustrate how it contributes to
enhancing existing BPM solutions in order to achieve more flexible, dynamic and
manageable business processes.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2008-47&engl=1}
}
@inproceedings {INPROC-2008-121,
author = {Branimir Wetzstein and Dimka Karastoyanova and Frank Leymann},
title = {{Towards Management of SLA-Aware Business Processes Based on Key Performance Indicators}},
booktitle = {Proceedings of the 9th Workshop on Business Process Modeling, Development, and Support (BPMDS'08); Montpellier, France, June 16 – 17, 2008},
publisher = {Online},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
type = {Workshop Paper},
month = {June},
year = {2008},
language = {English},
cr-category = {H.4.1 Office Automation},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {It is increasingly important that Service Level Agreements (SLAs) are taken
into account when business processes are exposed as services in a Service
Oriented Architecture. SLAs define expected service behavior and non-functional
properties of the service. The fact that the service provider has to offer
certain guarantees concerning SLA properties has an impact on the business
process lifecycle. In this paper we introduce a stepwise approach for
management of SLA-aware service compositions based on process performance
requirements specified as Key Performance Indicators. The approach is based on
the process lifecycle known from Business Process Management and comprises a
modeling, configuration and execution phase. We incorporate existing work on
SLA modeling, QoS aggregation, and QoS-based service selection, and identify
several problems specific to SLA-aware business processes.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2008-121&engl=1}
}
@inproceedings {INPROC-2008-09,
author = {Dimka Karastoyanova and Tammo van Lessen and Frank Leymann and Zhilei Ma and J{\"o}rg Nitzsche and Branimir Wetzstein and Sami Bhiri and Manfred Hauswirth and Maciej Zaremba},
title = {{A Reference Architecture for Semantic Business Process Management Systems}},
booktitle = {Multikonferenz Wirtschaftsinformatik 2008},
editor = {Martin Bichler and Thomas Hess and Helmut Krcmar and Ulrike Lechner and Florian Matthes and Arnold Picot and Benjamin Speitkamp and Petra Wolf},
address = {Berlin},
publisher = {GITO-Verlag},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {371--372},
type = {Conference Paper},
month = {February},
year = {2008},
isbn = {978-3-940019-34-9},
language = {English},
cr-category = {H.5.4 Hypertext/Hypermedia},
department = {University of Stuttgart, Institute of Architecture of Application Systems, Architecture of Application Systems},
abstract = {Semantic Business Process Management (SBPM) enhances BPM with semantic
technologies in order to increase the degree of automation in the BPM lifecycle
and help in bridging the gap between the business and IT views on business
processes. In this paper, we describe the architecture of an SBPM System
(SBPMS) which supports the whole SBPM lifecycle by providing functionality for
process modeling, process configuration, process execution, and process
analysis. We analyze the functional requirements of the SBPMS from the business
user's and the IT expert's point of view and derive and describe the components
of the SBPMS and their key interactions to achieve the required
functionalities. We show how existing BPMS components can be extended to use
semantics, and describe the integration of new components, such as a Semantic
Execution Environment. The presented SBPMS is based on BPMN, BPEL and WSMO
technologies.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2008-09&engl=1}
}
@inproceedings {INPROC-2007-99,
author = {Rania Khalaf and Dimka Karastoyanova and Frank Leymann},
title = {{Pluggable Framework for Enabling the Execution of Extended BPEL Behavior}},
booktitle = {Proceedings of the 3rd International Workshop on Engineering Service-Oriented Application (WESOA'2007)},
publisher = {Unbekannt},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
type = {Workshop Paper},
month = {September},
year = {2007},
doi = {10.1007/978-3-540-93851-4_37},
keywords = {Web services, AOP, middleware reuse, business process, BPEL},
language = {English},
cr-category = {H.4.1 Office Automation},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Adding runtime support for BPEL extensions typically requires (1) reacting to
navigation events from a BPEL engine executing an extended process model and
(2) affecting the engine’s navigation behavior based on external triggers. This
is usually achieved in a proprietary way for each engine and for each
extension.
In this paper, we provide a systematic approach to controlling and reacting to
process behavior as well as growing the set of supported control points, thus
enabling support for multiple application domains in a composable manner in a
BPEL engine. The framework presented in this paper (1) enables a BPEL engine to
support extensions, even on existing BPEL processes, and (2) allows developers
to create pluggable extension implementations that can be reused across
multiple BPEL engines. An implementation of the approach is presented and used
in three different projects that need widely differing extended BPEL
capabilities.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2007-99&engl=1}
}
@inproceedings {INPROC-2007-63,
author = {J{\"o}rg Nitzsche and Tammo van Lessen and Dimka Karastoyanova and Frank Leymann},
title = {{BPEL for Semantic Web Services (BPEL4SWS)}},
booktitle = {Proceedings of the 3rd International Workshop on Agents and Web Services in Distributed Environments AWeSome'07 -- On the Move to Meaningful Internet Systems 2007: OTM 2007 Workshops},
publisher = {Springer-Verlag},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
series = {Lecture Notes in Computer Science},
volume = {4805/2007},
pages = {179--188},
type = {Workshop Paper},
month = {November},
year = {2007},
isbn = {978-3-540-76887-6},
doi = {10.1007/978-3-540-76888-3_37},
keywords = {WS-BPEL; BPELlight; BPEL4SWS; Semantic Web Services; SWS; BPM},
language = {English},
cr-category = {C.2.4 Distributed Systems,
D.2.11 Software Engineering Software Architectures,
D.2.12 Software Engineering Interoperability,
H.4.1 Office Automation},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {In this paper we present BPEL for Semantic Web Services (BPEL4SWS) - a language
that facilitates the orchestration of Semantic Web Services using a process
based approach. It is based on the idea of WSDL-less BPEL and enables
describing activity implementations semantically which increases the
flexibility of business processes. Following an approach that uses a set of
composable standards and specifications, BPEL4SWS is independent of any
Semantic Web Service framework. It can be used to compose Semantic Web
Services, traditional Web Services and a mix of them.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2007-63&engl=1}
}
@inproceedings {INPROC-2007-60,
author = {Tammo van Lessen and Branimir Wetzstein and J{\"o}rg Nitzsche and Zhilei Ma and Dimka Karastoyanova and Frank Leymann},
title = {{Gesch{\"a}ftsprozessmanagement Meets Semantic Web.}},
booktitle = {Tagungsband Science Meets Business. Stuttgarter Softwaretechnik Forum 2007, Fraunhofer IAO, 23. November 2007.},
editor = {D. Spath and A. Weisbecker and O. H{\"o}{\ss} and J. (Hrsg.) Drawehn},
address = {Stuttgart},
publisher = {Fraunhofer IRB Verlag},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {75--83},
type = {Conference Paper},
month = {November},
year = {2007},
isbn = {3-8167-7493-8},
keywords = {Semantic Business Process Management},
language = {German},
cr-category = {H.4.1 Office Automation},
department = {University of Stuttgart, Institute of Architecture of Application Systems, Architecture of Application Systems},
abstract = {23. November 2007
Science Meets Business
Am vierten Tag des Stuttgarter Softwaretechnik Forums geben Experten aus
Forschung und Wissenschaft Einblick in aktuelle Forschungsarbeiten in den
Themenbereichen Softwareengineering, Softwaretechnik und Mobile Anwendungen.
Dadurch k{\"o}nnen die Zuh{\"o}rer interessante Impulse f{\"u}r ihr t{\"a}gliches Business
sowie einen Ausblick auf zuk{\"u}nftige Trends und Entwicklungen mitnehmen.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2007-60&engl=1}
}
@inproceedings {INPROC-2007-24,
author = {J{\"o}rg Nitzsche and Tammo van Lessen and Dimka Karastoyanova and Frank Leymann},
title = {{BPEL light}},
booktitle = {Proceedings of the 5th International Conference on Business Process Management (BPM 2007)},
publisher = {Springer-Verlag},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
series = {Lecture Notes in Computer Science},
volume = {4714},
pages = {214--229},
type = {Conference Paper},
month = {September},
year = {2007},
doi = {10.1007/978-3-540-75183-0_16},
keywords = {BPEL; BPEL light; WSDL-less BPEL; BPM; Workflow; SOA; Web services; flexibility; reusability},
language = {English},
cr-category = {C.2.4 Distributed Systems,
D.2.11 Software Engineering Software Architectures,
D.2.12 Software Engineering Interoperability,
H.4.1 Office Automation},
contact = {joerg.nitsche@iaas.uni-stuttgart.de and tammo.van.lessen@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems, Architecture of Application Systems},
abstract = {In this paper we present BPEL light which decouples process logic from
interface definitions. By extending BPEL 2.0 with a WSDL-less interaction
model, BPEL light allows to specify process models independent of Web service
technology. Since its interaction model is based on plain message exchange, it
is completely independent of any interface description language. This fosters
flexibility and reusability of process models and enables modelling platform
and component model independent business processes. The presented approach
takes a significant step towards narrowing down the gap between business level
and IT level by facilitating a more business-oriented modelling of executable
processes.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2007-24&engl=1}
}
@inproceedings {INPROC-2007-22,
author = {Dimka Karastoyanova and Branimir Wetzstein and Tammo van Lessen and Daniel Wutke and J{\"o}rg Nitzsche and Frank Leymann},
title = {{Semantic Service Bus: Architecture and Implementation of a Next Generation Middleware}},
booktitle = {Proceedings of the Second International ICDE Workshop on Service Engineering (SEIW 2007)},
publisher = {IEEE Computer Society},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {347--354},
type = {Workshop Paper},
month = {April},
year = {2007},
isbn = {1-4244-0832-6},
doi = {10.1109/ICDEW.2007.4401015},
keywords = {Semantic Service Bus; SSB; Enterprise Service Bus; BPEL},
language = {English},
cr-category = {C.2.4 Distributed Systems,
D.2.11 Software Engineering Software Architectures,
D.2.12 Software Engineering Interoperability,
H.4.1 Office Automation},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {In this paper we present a middleware for the Service Oriented Architecture,
called the Semantic Service Bus. It is an advanced middleware possessing
enhanced features, as compared to the conventional service buses. It is
distinguished by the fact that it uses semantic description of service
capabilities, as well as requirements towards services to enable more elaborate
service discovery, selection, routing, composition and data mediation. The
contributions of the paper are the conceptual architecture of the Semantic
Service Bus and a prototypical implementation supporting different semantic Web
service technologies (OWL and WSMO) and vanilla Web services. Since the mission
critical application scenarios (for SOA) involve complex orchestrations of
services, we have chosen to utilize semantically annotated service
orchestrations as the applications to use this middleware.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2007-22&engl=1}
}
@inproceedings {INPROC-2007-100,
author = {Tammo van Lessen and J{\"o}rg Nitzsche and Marin Dimitrov and Mihail Konstantinov and Dimka Karastoyanova and Luchesar Cekov and Frank Leymann},
title = {{An Execution Engine for Semantic Business Processes}},
booktitle = {Proceedings of Service-Oriented Computing - ICSOC 2007 Workshops},
publisher = {Springer-Verlag},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
series = {Lecture Notes in Computer Science},
volume = {4907},
pages = {200--211},
type = {Workshop Paper},
month = {September},
year = {2007},
language = {English},
cr-category = {H.4.1 Office Automation,
K.1 The Computer Industry},
ee = {www.sysedv.tu-berlin.de/semsoc/},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {In this paper we present the architecture and design of an extended BPEL engine
that implements the operational semantics of BPEL4SWS. BPEL4SWS is an extension
of the BPEL language with support for Semantic Web Service concepts like
mediation and semantic descriptions of activity implementations. We describe
the basic communication scenarios of processes with services and the
interaction between the engine components involved in the execution of BPEL4SWS
processes. The presented prototype is based on the open source BPEL engine
Apache ODE, features improved configurability and facilitates the definition of
additional BPEL extensions with minimal development effort.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2007-100&engl=1}
}
@inproceedings {INPROC-2006-86,
author = {Dimka Karastoyanova and Frank Leymann and J{\"o}rg Nitsche and Branimir Wetzstein and Daniel Wutke},
title = {{Utilizing Semantic Web Service Technologies for Automatic Execution of Parameterized BPEL Processes}},
booktitle = {XML Tage 2006},
publisher = {Unbekannt},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
type = {Conference Paper},
month = {September},
year = {2006},
language = {English},
cr-category = {H.4.1 Office Automation,
K.1 The Computer Industry},
ee = {http://www.xml-clearinghouse.de/ws/XMLT2006/2/},
department = {University of Stuttgart, Institute of Architecture of Application Systems, Architecture of Application Systems},
abstract = {Utilizing Semantic Web Service Technologies for Automatic Execution of
Parameterized BPEL Processes},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2006-86&engl=1}
}
@inproceedings {INPROC-2006-82,
author = {Dimka Karastoyanova and Frank Leymann and J{\"o}rg Nitzsche and Branimir Wetzstein and Daniel Wutke},
title = {{Parameterized BPEL Processes: Concepts and Implementation}},
booktitle = {Business Process Management},
editor = {Schahram Dustdar and Jos{\'e} Luiz Fiadeiro and Amit P. Sheth},
publisher = {Springer},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
series = {Lecture Notes in Computer Science},
volume = {4102},
pages = {471--476},
type = {Conference Paper},
month = {September},
year = {2006},
isbn = {3-540-38901-6},
doi = {10.1007/11841760_41},
language = {English},
cr-category = {K.1 The Computer Industry},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {This paper presents the concept of parameterized WS-flows and two extensions to
the BPEL language for enabling it. Another major contribution is a prototypical
infrastructure enacting the execution, monitoring and adaptation of
parameterized BPEL processes. The advantages of parameterized BPEL processes
are the improved flexibility and reusability.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2006-82&engl=1}
}
@inproceedings {INPROC-2005-122,
author = {Dimka Karastoyanova and Frank Leymann and Alejandro P. Buchmann},
title = {{An Approach to Parameterizing Web Service Flows}},
booktitle = {Proc. 3rd Intl. Conf. on Service Oriented Computing (ICSOC’2005)},
editor = {Boualem Benatallah and Fabio Casati and Paolo Traverso},
address = {Amsterdam, The Netherlands},
publisher = {Springer},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
series = {Lecture Notes in Computer Science},
volume = {3826},
pages = {533--538},
type = {Conference Paper},
month = {November},
year = {2005},
isbn = {3-540-30817-2},
doi = {10.1007/11596141_45},
language = {English},
cr-category = {K.1 The Computer Industry},
department = {University of Stuttgart, Institute of Architecture of Application Systems, Architecture of Application Systems},
abstract = {The flexibility and reusability of Web Service flows (WS-flows) are limited
especially by the fact that portType and operation names are hard-coded in the
process definition. In this paper we argue that through parameterization and
substitution WS-flows flexibility can be improved, while reusability is
enhanced. We introduce a meta-model extension to enable run time evaluation of
parameter values and thus discard the need to predict any possible partner
service types during process modeling. The extension enables also run time
changes in portType values. We show how the approach can be mapped to BPEL. We
discuss prototypical implementation for the extended functionality and present
conclusions and ideas for future work.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2005-122&engl=1}
}
@inproceedings {INPROC-2005-121,
author = {Dimka Karastoyanova and Alejandro Houspanossian and Mariano Cilia and Frank Leymann and Alejandro P. Buchmann},
title = {{Extending BPEL for Run Time Adaptability}},
booktitle = {Ninth IEEE International Enterprise Computing Conference (EDOC 2005)},
publisher = {IEEE Computer Society},
institution = {University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Germany},
pages = {15--26},
type = {Conference Paper},
month = {September},
year = {2005},
isbn = {0-7695-2441-9},
doi = {10.1109/EDOC.2005.14},
language = {English},
cr-category = {H.4.1 Office Automation},
department = {University of Stuttgart, Institute of Architecture of Application Systems, Architecture of Application Systems},
abstract = {The existing Web service flow (WS-flow) technologies enable both static and
dynamic binding of participating Web services (WSs) on the process model level.
Adaptability on per-instance basis is not sufficiently supported and therefore
must be addressed to improve process flexibility upon changes in the
environment. Ad-hoc process instance changes can be enabled by swapping
participating WS instances, by modifying port types of the partners to be
invoked, and by changing process logic. In this work, we address the problem of
dynamic binding of WSs to WS-flow instances at run time, i.e. the ability to
exchange a WS instance participating in a WS-flow instance with an alternative
one. The problem is additionally complicated by the fact that the execution of
a process depends on its deployment. We describe the ``find and bind'' mechanism,
and we show its representation as a BPEL extension. We discuss the benefits
that could be gained and the disadvantages it brings in. The mechanism extends
and improves the existing process technologies. It facilitates a precisely
controlled policy-based selection of WSs at run time and also provides for
process instance repair, while maintaining simplicity. We also discuss a
prototypical implementation of the presented functionality.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2005-121&engl=1}
}
@article {ART-2014-11,
author = {Steve Strauch and Vasilios Andrikopoulos and Dimka Karastoyanova and Frank Leymann and Nikolay Nachev and Albrecht Staebler},
title = {{Migrating Enterprise Applications to the Cloud: Methodology and Evaluation}},
journal = {International Journal of Big Data Intelligence},
publisher = {Perpetual Innovation Media Pvt. Ltd.},
volume = {1},
number = {3},
pages = {127--140},
type = {Article in Journal},
month = {December},
year = {2014},
keywords = {Data Migration; Decision Support; Database layer; Application Refactoring},
language = {English},
cr-category = {C.2.4 Distributed Systems,
C.4 Performance of Systems,
D.2.8 Software Engineering Metrics,
D.2.11 Software Engineering Software Architectures,
H.2.1 Database Management Logical Design,
H.2.4 Database Management Systems,
H.3.4 Information Storage and Retrieval Systems and Software,
H.4.2 Information Systems Applications Types of Systems},
contact = {a href=``http://www.iaas.uni-stuttgart.de/institut/mitarbeiter/strauch''Steve Strauch/ a},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Migrating existing on-premise applications to the cloud is a complex and
multi-dimensional task and may require adapting the applications themselves
significantly. For example, when considering the migration of the database
layer of an application, which provides data persistence and manipulation
capabilities, it is necessary to address aspects like differences in the
granularity of interactions and data confidentiality, and to enable the
interaction of the application with remote data sources. In this work, we
present a methodology for application migration to the cloud that takes these
aspects into account. In addition, we also introduce a tool for decision
support, application refactoring and data migration that assists application
developers in realising this methodology. We evaluate the proposed methodology
and enabling tool using a case study in collaboration with an IT enterprise.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2014-11&engl=1}
}
@article {ART-2014-10,
author = {Andreas Wei{\ss} and Dimka Karastoyanova},
title = {{Enabling coupled multi-scale, multi-field experiments through choreographies of data-driven scientific simulations}},
journal = {Computing},
publisher = {Springer Wien},
pages = {0--29},
type = {Article in Journal},
month = {October},
year = {2014},
doi = {10.1007/s00607-014-0432-7},
keywords = {Simulation workflow; Scientific workflow; Choreography; Multi-scale, Multi-field experiment; Data-driven scientific simulation},
language = {English},
cr-category = {H.4.1 Office Automation},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Current systems for enacting scientific experiments, and simulation workflows
in particular, do not support multi-scale and multi-field problems if they are
not coupled on the level of the mathematical model. To address this deficiency,
we present an approach enabling the trial-and-error modeling and execution of
multi-scale and/or multi-field simulations in a top-down and bottom-up manner
which is based on the notion of choreographies. The approach defines techniques
for composing data-intensive, scientific workflows in more complex simulations
in a generic, domain-independent way and thus provides means for collaborative
and integrated data management using the workflow/process-based paradigm. We
contribute a life cycle definition of such simulations and present in detail
concepts and techniques that support all life cycle phases. Furthermore,
requirements on a respective software system and choreography language
supporting multi-scale and/or multi-field simulations are identified, and an
architecture and its realization are presented.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2014-10&engl=1}
}
@article {ART-2014-02,
author = {Michael Reiter and Uwe Breitenb{\"u}cher and Oliver Kopp and Dimka Karastoyanova},
title = {{Quality of Data Driven Simulation Workflows}},
journal = {Journal of Systems Integration},
publisher = {Online},
volume = {5},
number = {1},
pages = {3--9},
type = {Article in Journal},
month = {January},
year = {2014},
issn = {1804-2724},
language = {English},
cr-category = {H.3.4 Information Storage and Retrieval Systems and Software,
H.4.1 Office Automation},
ee = {http://www.si-journal.org/index.php/JSI/article/view/189,
http://creativecommons.org/licenses/by-nc/3.0/cz/deed.en},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Simulations are long-running computations driven by non-trivial data
dependencies. Workflow technology helps to automate these simulations and
enable using Quality of Data (QoD) frameworks to determine the goodness of
simulation data. However, existing frameworks are specific to scientific
domains, individual applications, or proprietary workflow engine extensions. In
this paper, we propose a generic approach to use QoD as a uniform means to
steer complex interdisciplinary simulations implemented as workflows. The
approach enables scientists to specify abstract QoD requirements that are
considered to steer the workflow for ensuring a precise final result. To
realize these Quality of Data-driven workflows, we present a middleware
architecture and a WS-Policy-based language to describe QoD requirements and
capabilities. To prove technical feasibility, we present a prototype for
controlling and steering simulation workflows and a real world simulation
scenario.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2014-02&engl=1}
}
@article {ART-2013-06,
author = {Mirko Sonntag and Dimka Karastoyanova},
title = {{Model-as-you-go: An Approach for an Advanced Infrastructure for Scientific Workflows}},
journal = {Journal of Grid Computing},
publisher = {Springer Verlag},
volume = {11},
number = {3},
pages = {553--583},
type = {Article in Journal},
month = {September},
year = {2013},
doi = {10.1007/s10723-013-9268-1},
issn = {1570-7873},
keywords = {Scientific and business workflows; Workflow flexibility and adaptation; Workflow monitoring; SOA; BPEL},
language = {English},
cr-category = {H.4.1 Office Automation},
contact = {karastoyanova@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Most of the existing scientific workflow systems rely on proprietary concepts
and workflow languages. We are convinced that the conventional workflow
technology that is established in business scenarios for years is also
beneficial for scientists and scientific applications. We are therefore working
on a scientific workflow system based on business workflow concepts and
technologies. The system offers advanced flexibility features to scientists in
order to support them in creating workflows in an explorative manner and to
increase robustness of scientific applications. We named the approach
Model-as-you-go because it enables users to model and execute workflows in an
iterative process that eventually results in a complete scientific workflow. In
this paper, we present main ingredients of Model-as-you-go, show how existing
workflow concepts have to be extended in order to cover the requirements of
scientists, discuss the application of the concepts to BPEL, and introduce the
current prototype of the system.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2013-06&engl=1}
}
@article {ART-2012-10,
author = {Mirko Sonntag and Dimka Karastoyanova},
title = {{Ad hoc Iteration and Re-execution of Activities in Workflows}},
journal = {International Journal On Advances in Software},
publisher = {Xpert Publishing Services},
volume = {5},
number = {1 \& 2},
pages = {91--109},
type = {Article in Journal},
month = {July},
year = {2012},
issn = {1942-2628},
keywords = {workflow ad hoc adaptation; iteration; re-execution; service composition},
language = {English},
cr-category = {H.4.1 Office Automation,
I.6.5 Model Development,
D.2.2 Software Engineering Design Tools and Techniques},
ee = {http://www.iariajournals.org/software/},
contact = {sonntag@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {The repeated execution of workflow logic is usually modeled with loop
constructs in the workflow model. But there are cases where it is not known at
design time that a subset of activities has to be rerun during workflow
execution. For instance in e-Science, scientists might have to spontaneously
repeat a part of an experiment modeled and executed as workflow in order to
gain meaningful results. In general, a manually triggered ad hoc rerun enables
users reacting to unforeseen problems and thus improves workflow robustness. It
allows natural scientists steering the convergence of scientific results,
business analysts controlling their analyses results, and it facilitates an
explorative workflow development as required in scientific workflows. In this
paper, two operations are formalized for a manually enforced repeated enactment
of activities, the iteration and the re-execution. The focus thereby lies on an
arbitrary, user-selected activity as a starting point of the rerun. Important
topics discussed in this context are handling of data, rerun of activities in
activity sequences as well as in parallel and alternative branches,
implications on the communication with partners/services and the application of
the concept to workflow languages with hierarchically nested activities. Since
the operations are defined on a meta-model level, they can be implemented for
different workflow languages and engines.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2012-10&engl=1}
}
@article {ART-2012-08,
author = {Branimir Wetzstein and Asli Zengin and Raman Kazhamiakin and Annapaola Marconi and Marco Pistore and Dimka Karastoyanova and Frank Leymann},
title = {{Preventing KPI Violations in Business Processes based on Decision Tree Learning and Proactive Runtime Adaptation}},
journal = {Journal of Systems Integration},
publisher = {Online},
volume = {3},
number = {1},
pages = {3--18},
type = {Article in Journal},
month = {January},
year = {2012},
issn = {1804-2724},
language = {English},
cr-category = {H.4.1 Office Automation},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {The performance of business processes is measured and monitored in terms of Key
Performance Indicators (KPIs). If the monitoring results show that the KPI
targets are violated, the underlying reasons have to be identified and the
process should be adapted accordingly to address the violations. In this paper
we propose an integrated monitoring, prediction and adaptation approach for
preventing KPI violations of business process instances. KPIs are monitored
continuously while the process is executed. Additionally, based on KPI
measurements of historical process instances we use decision tree learning to
construct classification models which are then used to predict the KPI value of
an instance while it is still running. If a KPI violation is predicted, we
identify adaptation requirements and adaptation strategies in order to prevent
the violation.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2012-08&engl=1}
}
@article {ART-2012-01,
author = {Ralph Retter and Christoph Fehling and Dimka Karastoyanova and Frank Leymann and Daniel Schleicher},
title = {{Combining Horizontal and Vertical Composition of Services}},
journal = {Service Oriented Computing and Applications},
publisher = {Springer},
pages = {1--11},
type = {Article in Journal},
month = {January},
year = {2012},
language = {English},
cr-category = {H.4.1 Office Automation,
C.2.4 Distributed Systems,
D.2.2 Software Engineering Design Tools and Techniques,
D.2.3 Software Engineering Coding Tools and Techniques},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Service composition is a well-established field of research in the service
community. Services are commonly regarded as black boxes with well-defined
interfaces that can be recursively aggregated into new services. The black-box
nature of services does not only include the service implementation but also
implies the use of middleware and hardware to run the services. Thus, service
composition techniques are typically limited to choosing between a set of
available services. In this paper we keep the black-box nature and the
principle of information hiding of services, but in addition we break up
services vertically. By introducing vertical service composition, we allow
services to be provisioned on-demand using the middleware and runtime
environment that specifically meets user-required quality of services (QoS).
Therefore, a service is setup individually for services requestors instead of
providing them with a pre-determined list of available services to choose from.
We introduce the concept of vertical service composition and present an
extension to an enterprise service bus (ESB) that implements the concept of
vertical service composition by combining concepts from provisioning with those
of (dynamic) service binding.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2012-01&engl=1}
}
@article {ART-2011-18,
author = {Oliver Kopp and Katharina G{\"o}rlach and Dimka Karastoyanova and Frank Leymann and Michael Reiter and David Schumm and Mirko Sonntag and Steve Strauch and Tobias Unger and Matthias Wieland and Rania Khalaf},
title = {{A Classification of BPEL Extensions}},
journal = {Journal of Systems Integration},
publisher = {Online},
volume = {2},
number = {4},
pages = {2--28},
type = {Article in Journal},
month = {November},
year = {2011},
issn = {1804-2724},
keywords = {BPEL Extension; Classification of Extensions; Extension Guidelines},
language = {English},
cr-category = {H.4.1 Office Automation},
ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/ART-2011-18/ART-2011-18.pdf,
http://www.si-journal.org/index.php/JSI/article/view/103},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {The Business Process Execution Language (BPEL) has emerged as de-facto standard
for business processes implementation. This language is designed to be
extensible for including additional valuable features in a standardized manner.
There are a number of BPEL extensions available. They are, however, neither
classified nor evaluated with respect to their compliance to the BPEL standard.
This article fills this gap by providing a framework for classifying BPEL
extensions, a classification of existing extensions, and a guideline for
designing BPEL extensions.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2011-18&engl=1}
}
@article {ART-2011-02,
author = {David Schumm and Dimka Karastoyanova and Oliver Kopp and Frank Leymann and Mirko Sonntag and Steve Strauch},
title = {{Process Fragment Libraries for Easier and Faster Development of Process-based Applications}},
journal = {Journal of Systems Integration},
publisher = {Online},
volume = {2},
number = {1},
pages = {39--55},
type = {Article in Journal},
month = {January},
year = {2011},
issn = {1804-2724},
keywords = {Process Fragment; Process Design; Reusability; Process Library.},
language = {English},
cr-category = {H.4.1 Office Automation},
ee = {http://www.si-journal.org/,
http://www.si-journal.org/index.php/JSI/article/view/83},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {The term “process fragment” is recently gaining momentum in business process
management research. We understand a process fragment as a connected and
reusable process structure, which has relaxed completeness and consistency
criteria compared to executable processes. We claim that process fragments
allow for an easier and faster development of process-based applications. As
evidence to this claim we present a process fragment concept and show a sample
collection of concrete, real-world process fragments. We present advanced
application scenarios for using such fragments in development of process-based
applications. Process fragments are typically managed in a repository, forming
a process fragment library. On top of a process fragment library from previous
work, we discuss the potential impact of using process fragment libraries in
cross-enterprise collaboration and application integration.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2011-02&engl=1}
}
@article {ART-2010-14,
author = {Dimka Karastoyanova and Tammo van Lessen and Ralph Mietzner},
title = {{BPM au{\ss}erhalb der Verwaltung: Ein Blick {\"u}ber den Tellerrand}},
journal = {Business Technology 3.2010 - Prozesse},
publisher = {Software \& Support Verlag},
pages = {54--58},
type = {Article in Journal},
month = {October},
year = {2010},
keywords = {BPM; Systems Management; Nexus; SimTech; Software Engineering; Message Exchange Patterns},
language = {German},
cr-category = {H.4.1 Office Automation},
ee = {http://it-republik.de/business-technology/bt-magazin-ausgaben/Prozesse-000420.html},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Beim Thema Gesch{\"a}ftsprozessmanagement (Business Process Management (BPM))
denken wir unweigerlich an Dokumentation und Werkzeugunterst{\"u}tzung f{\"u}r
administrative Prozesse wie Kreditgenehmigungs-, Reisebuchungs- und
Versicherungsantragsprozesse. Doch auch in anderen Dom{\"a}nen wie der Produktion,
dem Systems Management, der Softwareentwicklung, der Forschung oder der
Simulation etc. kommen Methoden und Techniken des Gesch{\"a}ftsprozessmanagements
zunehmend zum Einsatz. In diesem Artikel stellen wir Anwendungsf{\"a}lle und
BPM-L{\"o}sungen f{\"u}r diese Dom{\"a}nen vor und beleuchten die Vorteile, die aus einem
durchg{\"a}ngigen BPM-Ansatz entstehen.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2010-14&engl=1}
}
@article {ART-2010-10,
author = {Olha Danylevych and Dimka Karastoyanova and Frank Leymann},
title = {{Service Networks Modelling: An SOA \& BPM Standpoint}},
journal = {Journal of Universal Computer Science (J.UCS)},
publisher = {JUCS},
volume = {16},
number = {13},
pages = {1668--1693},
type = {Article in Journal},
month = {September},
year = {2010},
keywords = {service networks; service oriented architecture; software services; business process management; business processes; BPMN},
language = {English},
cr-category = {D.2.9 Software Engineering Management,
H.1 Models and Principles,
H.3.5 Online Information Services},
ee = {http://www.jucs.org/jucs_16_13/service_networks_modelling_an},
contact = {olha.danylevych@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Services are quintessential in the current economical landscape. Enterprises
and businesses at large rely on the consumption and providing of services to
ensure their operations and to realize their business offers. That is, nowadays
businesses all over the world are interconnected with each other by complex
service-centric webs called service networks. The ubiquity and pervasiveness of
service networks call for models, methods, mechanisms and tools to understand
them and harness their potential.
This paper investigates the modelling of the service networks with a focus on
business relationships and exchanges of software services among the involved
parties. The contribution of this work is threefold. Firstly, we provide an
overview of what service networks modelling can offer in combination with
Business Process Management (BPM) and Service Oriented Architecture (SOA)
technologies. Secondly, we propose a formalism to model service networks that
depicts them as aggregations of participants – e.g. enterprises or individuals
– that offer, request, consume and provide services to each other. With the
goal of providing a foundation for the alignment between service network- and
business process models, we finally map the constructs of our service networks
modelling formalism to the ones of the Business Process Modelling Notation
(BPMN).},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2010-10&engl=1}
}
@article {ART-2010-02,
author = {Mirko Sonntag and Katharina G{\"o}rlach and Dimka Karastoyanova and Frank Leymann and Michael Reiter},
title = {{Process Space-based Scientific Workflow Enactment}},
journal = {International Journal of Business Process Integration and Management (IJBPIM) Special Issue on Scientific Workflows, Vol 5, No. 1, pp. 32-44},
publisher = {Inderscience Publishers},
pages = {32--44},
type = {Article in Journal},
month = {April},
year = {2010},
doi = {10.1504/IJBPIM.2010.033173},
keywords = {BPEL; Process Space; Scientific Workflow; Data References; Distributed System},
language = {English},
cr-category = {H.4.1 Office Automation,
H.3.4 Information Storage and Retrieval Systems and Software},
contact = {Mirko.Sonntag@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {In the scientific field, the workflow technology is often employed to conduct
computer simulations or computer supported experiments. The underlying IT
infrastructure typically comprises resources distributed among different
institutes and organizations all over the world. Traditionally, workflows are
executed on a single machine while the invoked software is accessed remotely.
This approach imposes many drawbacks which are outlined in this paper. To
address these weaknesses we investigate the application of decentralized
workflow enactment in the scientific domain. In this context, we explore the
employment of process spaces, a middleware for the decentralized execution of
workflows. Furthermore, we propose the combination of process spaces with the
concept of data references to increase the overall performance of distributed
simulations based on workflows. The considerations are discussed with the help
of a scenario that calculates and visualizes the ink diffusion in water over a
period of time.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2010-02&engl=1}
}
@article {ART-2009-02,
author = {Ralph Mietzner and Dimka Karastoyanova and Frank Leymann},
title = {{Business Grid: Combining Web Services and the Grid}},
journal = {Transactions on Petri Nets and Other Models of Concurrency (ToPNoC) Special Issue on Concurrency in Process-aware Information Systems.},
publisher = {Springer Verlag},
pages = {136--151},
type = {Article in Journal},
month = {January},
year = {2009},
doi = {10.1007/978-3-642-00899-3_8},
keywords = {dynamic provisioning; on-demand provisioning},
language = {English},
cr-category = {H.3.4 Information Storage and Retrieval Systems and Software},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {The common overarching goal of service bus and Grid middleware is
``virtualization'' – virtualization of business functions and virtualization of
resources, respectively. By combining both capabilities a new infrastructure
called ``Business Grid'' results. This infrastructure meets the requirements of
both business applications and scientific computations in a unified manner and
in particular those that are not addressed by the middleware infrastructures in
each of the fields. Furthermore, it is the basis for enacting new trends like
Software as a Service or Cloud computing. In this paper the overall
architecture of the Business Grid is outlined. The Business Grid applications
are described and the need for their customizability and adaptability is
advocated. Requirements on the Business Grid like concurrency, multi-tenancy
and scalability are addressed. The concept of ``provisioning flows'' and other
mechanisms to enable scalability as required by a high number of concurrent
users are outlined.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2009-02&engl=1}
}
@article {ART-2008-20,
author = {J{\"o}rg Nitzsche and Tammo van Lessen and Dimka Karastoyanova and Frank Leymann},
title = {{Composing Services on the Grid Using BPEL4SWS}},
journal = {Multiagent and Grid Systems},
publisher = {IOS Press},
volume = {4},
type = {Article in Journal},
month = {December},
year = {2008},
keywords = {Grid; BPEL; BPEL4SWS; Grid Services; Web Services; Semantic Web Services; Scientific Workflows},
language = {English},
cr-category = {H.4.1 Office Automation},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Service composition on the Grid is a challenging task as documented in existing
research work. Even though there are initial attempts to use the Business
Process Execution Language (BPEL) to compose services on the Grid, still there
is a significant lack of flexibility and reusability needed in scientific
applications. In this paper we present BPEL for Semantic Web Services
(BPEL4SWS) - a language that facilitates the orchestration of Grid Services
exposed as traditional Web Services or Semantic Web Services using a
process-based approach. It is based on the idea of WSDL-less BPEL and
incorporates semantic descriptions of process activity implementations which
increases the flexibility of business workflows as well as scientific
workflows. Following an approach that uses a set of composable standards and
specifications, BPEL4SWS is independent of any Semantic Web Service framework
and therefore can also utilize any kind of Semantic Grid services. The
advantages of BPEL4SWS are: (1) compliance with standards, (2) independence on
service technologies, (3) applicability for both business applications as well
as scientific workflows that use Grid services, (4) improved flexibility of
processes.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2008-20&engl=1}
}
@article {ART-2007-07,
author = {J{\"o}rg Nitzsche and Tammo van Lessen and Dimka Karastoyanova and Frank Leymann},
title = {{WSMO/X in the context of business processes: improvement recommendations}},
journal = {International Journal of Web Information Systems},
publisher = {Emerald},
volume = {3},
number = {1/2},
pages = {89--103},
type = {Article in Journal},
month = {January},
year = {2007},
issn = {1744-0084},
doi = {10.1108/17440080710829234},
keywords = {WSMO; WSMX; BPEL; BPM; SWS; Semantic Web Services},
language = {English},
cr-category = {C.2.4 Distributed Systems,
D.2.11 Software Engineering Software Architectures,
D.2.12 Software Engineering Interoperability,
H.4.1 Office Automation},
ee = {http://www.emeraldinsight.com/Insight/viewContentItem.do?contentType=Article&contentId=1630706},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Service-oriented architecture (SOA) is an architecture paradigm targeting
integration of applications within and across enterprise boundaries. It has
gathered research and industry acceptance and has given an enormous impetus to
the business process management technology. Web service (WS) technology is one
implementation of the SOA paradigm. It enables seamless integration of new and
legacy applications through a stack of standardized composable specifications.
WS orchestration is facilitated by the Business Process Execution Language
which provides a recursive service composition model. While the programming
model the WS technology provides is very flexible, a major deficiency is the
need to discover services implementing a particular abstract interface, whereas
functional similarities of services are disregarded. The Semantic Web Service
technologies, like Web Service Modelling Ontology (WSMO) and Web Ontology
Language for Services have been developed with the purpose of eliminating these
deficiencies by enabling service discovery based on functional and
non-functional properties. The paper aims to focus on these issues. This paper
presents a list of requirements that business processes impose on SOA
applications. It analyzes the support that WSMO/Web Service Model eXecution
environment (WSMX) provides to address these requirements and compares it with
the support enabled by the WS specification stack. The paper identifies major
flaws in the WSMO model and its reference implementation with respect to
business process support. The paper recommends possible solutions for
eliminating the lack of needed features on behalf of WSMO/WSMX. It presents in
detail how to enable asynchronous stateful communication among WSMO WS and
partner-based WS discovery by extending the WSMO model. Additionally, it
extends the API of the reference implementation to facilitate the execution of
services communicating asynchronously.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2007-07&engl=1}
}
@inbook {INBOOK-2016-02,
author = {Santiago G{\'o}mez S{\'a}ez and Vasilios Andrikopoulos and Michael Hahn and Dimka Karastoyanova and Frank Leymann and Marigianna Skouradaki and Karolina Vukojevic-Haupt},
title = {{Performance and Cost Trade-Off in IaaS Environments: A Scientific Workflow Simulation Environment Case Study}},
series = {Cloud Computing and Services Science},
publisher = {Springer},
series = {Communications in Computer and Information Science},
volume = {581},
pages = {153--170},
type = {Article in Book},
month = {February},
year = {2016},
language = {English},
cr-category = {C.2.4 Distributed Systems,
D.2.8 Software Engineering Metrics,
D.2.11 Software Engineering Software Architectures},
contact = {Santiago G{\'o}mez S{\'a}ez: santiago.gomez-saez@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {The adoption of the workflow technology in the eScience domain has contributed
to the increase of simulation-based applications orchestrating different
services in a flexible and error-free manner. The nature of the provisioning
and execution of such simulations makes them potential candidates to be
migrated and executed in Cloud environments. The wide availability of
Infrastructure-as-a-Service (IaaS) Cloud offerings and service providers has
contributed to a raise in the number of supporters of partially or completely
migrating and running their scientific experiments in the Cloud. Focusing on
Scientific Workflow-based Simulation Environments (SWfSE) applications and
their corresponding underlying runtime support, in this research work we aim at
empirically analyzing and evaluating the impact of migrating such an
environment to multiple IaaS infrastructures. More specifically, we focus on
the investigation of multiple Cloud providers and their corresponding optimized
and non-optimized IaaS offerings with respect to their offered performance, and
its impact on the incurred monetary costs when migrating and executing a SWfSE.
The experiments show significant performance improvements and reduced monetary
costs when executing the simulation environment in off-premise Clouds.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INBOOK-2016-02&engl=1}
}
@inbook {INBOOK-2015-01,
author = {Steve Strauch and Vasilios Andrikopoulos and Dimka Karastoyanova and Karolina Vukojevic-Haupt},
title = {{Migrating eScience Applications to the Cloud: Methodology and Evaluation}},
series = {Cloud Computing with E-science Applications},
publisher = {CRC Press/Taylor \& Francis},
type = {Article in Book},
month = {July},
year = {2015},
keywords = {Data Migration; Decision Support; Database layer; Application Refactoring},
language = {English},
cr-category = {D.2.11 Software Engineering Software Architectures,
H.3.4 Information Storage and Retrieval Systems and Software},
contact = {steve.strauch@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {eScience is an active field of research striving to enable faster scientific
discovery and ground-breaking research in different scientific domains by means
of information technology. In recent years Cloud computing has gained
significant acceptance in both the enterprise application management and
scientific computing for its promise to reduce infrastructure costs and provide
virtually unlimited computational power and data storage - requirements of
particular importance for businesses, and of even greater importance to
scientists and research organizations. While research in this field is very
active in providing novel concepts, techniques and principles towards building
Cloud-native applications, there is a significant effort to Cloud-enable
existing applications in order to reuse existing systems and therefore
investments. Typically, Cloud-enabling applications is related to the migration
of whole systems or parts of them on a public or private Cloud environment.
In this work we present a vendor- and technology-independent methodology for
migrating the database layer of applications, and refactoring the application
architecture. The methodology is applicable to applications in different
application domains and is agnostic to the types of data sources. It fulfils
requirements also presented in this work, which we have identified in
collaboration with software engineers and domain experts in several research
projects. We use this methodology to migrate the database layer of a scientific
workflow management system (SimTech SWfMS), which we developed in the scope of
our research activities in the SimTech project. The migration of the SimTech
SWfMS has been done using the Cloud Data Migration Support Tool - a proof of
concept implementation of the methodology. Both the introduced methodology and
the supporting tool have been evaluated and our findings are presented.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INBOOK-2015-01&engl=1}
}
@inbook {INBOOK-2011-01,
author = {Katharina G{\"o}rlach and Mirko Sonntag and Dimka Karastoyanova and Frank Leymann and Michael Reiter},
title = {{Conventional Workflow Technology for Scientific Simulation}},
series = {Guide to e-Science},
publisher = {Springer-Verlag},
pages = {323--352},
type = {Article in Book},
month = {March},
year = {2011},
isbn = {978-0-85729-438-8},
doi = {10.1007/978-0-85729-439-5_12},
keywords = {Business workflows; BPEL; Scientific workflows; Simulation; Workflow Management Systems},
language = {English},
cr-category = {H.4.1 Office Automation},
ee = {http://www.springer.com/computer/information+systems+and+applications/book/978-0-85729-438-8},
contact = {Katharina G{\"o}rlach: goerlach@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Workflow technology is established in the business domain for several years.
This fact suggests the need for detailed investigations in the qualification of
conven-tional workflow technology for the evolving application domain of
e-Science. This chapter discusses the requirements on scientific workflows, the
state of the art of scientific workflow management systems as well as the
ability of conven-tional workflow technology to fulfill requirements of
scientists and scientific ap-plications. It becomes clear that the features of
conventional workflows can be advantageous for scientists but also that
thorough enhancements are needed. We therefore propose a conceptual
architecture for scientific workflow management systems based on the business
workflow technology as well as extensions of exist-ing workflow concepts in
order to improve the ability of established workflow technology to an
application in the scientific domain with focus on scientific simulations.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INBOOK-2011-01&engl=1}
}
@inbook {INBOOK-2010-06,
author = {Dimka Karastoyanova},
title = {{On Scientific Experiments and Flexible Service Compositions}},
series = {From Active Data Management to Event-Based Systems and More. Festschrift.},
address = {Berlin Heidelberg New York},
publisher = {Springer Verlag},
series = {LNCS},
volume = {6462},
pages = {175--194},
type = {Article in Book},
month = {November},
year = {2010},
isbn = {978-3-642-17225-0},
keywords = {scientific workflows, service composition, flexibility, BPEL, Web Services},
language = {English},
cr-category = {C.2 Computer-Communication Networks,
H.4 Information Systems Applications,
D.2 Software Engineering,
H.3 Information Storage and Retrieval,
I.2 Artificial Intelligence,
C.2.4 Distributed Systems},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {The IT support for scientific experimenting and e-science is currently not at
the level of maturity of the support enterprises obtain. Since recently there
is a trend of reusing existing enterprise software and related concepts for
scientific experiments, scientific workflows and simulation. Most notably these
are the workflow technology, which is widely used in business process
management (BPM), and integration paradigms like the service oriented
architecture (SOA). In this work we give an overview of open issues in the
support for scientific experiments and possible approaches to addressing them
in a service-based environment. We identify the need for enhancing the BPM
practices, technologies and techniques in order to render them applicable in
the area of scientific experimenting. We stress on the even greater importance
of workflow flexibility and also show why flexibility techniques are crucial
when it is about improving the IT support for scientists.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INBOOK-2010-06&engl=1}
}
@inbook {INBOOK-2010-04,
author = {George Baryannis and Olha Danylevych and Dimka Karastoyanova and Kritikos Kyriakos and Philipp Leitner and Florian Rosenberg and Branimir Wetzstein},
title = {{Service Composition}},
series = {Service Research Challenges and Solutions for the Future Internet: S-Cube - Towards Engineering, Managing and Adapting Service-Based Systems},
publisher = {Springer},
series = {Lecture Notes in Computer Science},
volume = {6500},
pages = {55--84},
type = {Article in Book},
month = {October},
year = {2010},
isbn = {978-3-642-17598-5},
language = {English},
cr-category = {C.2 Computer-Communication Networks,
F.3 Logics and Meanings of Programs,
D.2 Software Engineering,
I.2 Artificial Intelligence,
H.4 Information Systems Applications,
H.3 Information Storage and Retrieval},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {The Internet has reached a crossroads in its evolution from a source of
information to a critical infrastructure, underpinning economies and everyday
life. The demand for more multimedia content, interconnected devices, greater
connectivity, richer user experiences and services available at any time and
from anywhere is increasing the pressure on existing networks and platforms. In
this ubiquitous Internet, the number and scope of services available globally
are predicted to grow exponentially leading to the ‘Internet of Services’.
However, in order for these services to be used and re-used in the construction
and evolution of service-based systems, significant research effort is required
into the broader aspects of services and particularly into the
multidisciplinary problems that cut across diverse scientific disciplines. The
S-Cube Network of Excellence is one of more than 50 projects within the
European Union's FP7 - ICT Programme for Research and Development researching
various aspects of the Internet of Services. Within this cohort, S-Cube focuses
on fundamental principles, techniques and methods for the service-based systems
of the future, combining knowledge from experts in the areas of grid computing,
service-oriented computing, business process management, software engineering
and human-computer interaction. This book presents the foundations, vision,
first results and future work in the area of software services as addressed by
S-Cube. The book starts with a presentation of the S-Cube research framework,
developed to assist in unifying research communities and agendas across Europe,
and provides an introduction to the vision of S-Cube, where the anticipated
growth in services and service-based systems will have a profound effect on
business and society. The remainder of the book follows the building blocks of
the research framework and addresses technologies required for realizing future
service-based systems and service engineering principles, techniques and
methods that use those technologies to ensure robust, manageable and adaptable
systems.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INBOOK-2010-04&engl=1}
}
@inbook {INBOOK-2010-03,
author = {Dimka Karastoyanova and Frank Leymann},
title = {{Making Scientific Applications on the Grid Reliable through Flexibility Approaches Borrowed from Service Compositions}},
series = {Handbook of Research on P2P and Grid Systems for Service-Oriented Computing: Models, Methodologies and Applications. Volume II.},
publisher = {IGI Global},
pages = {635--656},
type = {Article in Book},
month = {January},
year = {2010},
doi = {10.4018/978-1-61520-686-5},
language = {English},
cr-category = {H.0 Information Systems General,
H.1.0 Information Systems Models and Principles General,
H.m Information Systems Miscellaneous,
J.1 Administration Data Processing,
J.2 Physical Sciences and Engineering},
ee = {http://www.igi-global.com/bookstore/TitleDetails.aspx?TitleId=37249&DetailsType=AffiliateBio},
contact = {Dimka Karastoyanova dimka.karastoyanova@iaas.uni-stuttgart.de},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Making Scientific Applications on the Grid Reliable through Flexibility
Approaches Borrowed from Service Compositions
Dimka Karastoyanova, Frank Leymann IAAS, University of Stuttgart, Germany
e-mail: {Karastoyanova, Leymann}@iaas.uni-stuttgart.de
Abstract The current trend in Service Oriented Computing (SOC) is to enable
support for new delivery models of software and applications. These endeavours
impose requirements on the resources and services used, on the way applications
are created and on the QoS characteristics of the applications and the
supporting infrastructure. Scientific applications on the other hand require
improved robustness and reliability of the supporting Grid infrastructures
where resources appear and disappear constantly. Enabling business model like
Software as a Service (SaaS), Infrastructure as a Service (IaaS), and
guaranteeing reliability of Grid infrastructures are requirements that both
business and scientific application nowadays impose. The convergence of
existing approaches from SOC and Grid Computing is therefore an obvious need.
In this work we give an overview of the state-of-the-art of the overlapping
research done in the area of SOC and Grid computing with respect to meeting the
requirements of the applications in these two areas. We show that the
requirements of business applications that already exploit service-oriented
architectures (SOA) and the scientific application utilizing Grid
infrastructures overlap. Due to the limited extent of cooperation between the
two research communities the research results are either overlapping or
diverging in spite of the similarities in requirements. Notably, some of the
techniques developed in each area are needed but still missing in the other
area and vice versa. We argue therefore that in order to enable an
enterprise-strength service-oriented infrastructure one needs to combine and
leverage the existing Grid and Service middleware in terms of architectures and
implementations. We call such an infrastructure the Business Grid. Based on the
Business Grid vision we focus in this work on presenting how reliability and
robustness of the Business Grid can be improved by employing approaches for
flexibility of service compositions. An overview and assessment of these
approaches are presented together with recommendations for use. Based on the
assumption that Grid services are Web services, these approaches can be
utilized to improve the reliability of the scientific applications thus drawing
on the advantages flexible workflows provide. This way we improve the
robustness of scientific applications by making them flexible and hence improve
the features of business applications that employ Grid resources and Grid
service compositions to realize the SaaS, IaaS etc. delivery models.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INBOOK-2010-03&engl=1}
}
@inbook {INBOOK-2010-02,
author = {Frank Leymann and Dimka Karastoyanova and Mike Papazoglou},
title = {{Business Process Management Standards}},
series = {Handbook on Business Process Management 1},
publisher = {Springer-Verlag},
type = {Article in Book},
month = {July},
year = {2010},
isbn = {978-3-642-00415-5},
language = {English},
cr-category = {H.4.1 Office Automation},
ee = {http://www.springer.com/business+%26+management/business+information+systems /book/978-3-642-00415-5,
http://www.bpm-handbook.com/},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Business Process Management Standards},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INBOOK-2010-02&engl=1}
}
@inbook {INBOOK-2009-02,
author = {Dimka Karastoyanova and Tammo van Lessen and Frank Leymann and Zhilei Ma and J{\"o}rg Nitzsche and Branimir Wetzstein},
title = {{Semantic Business Process Management: Applying Ontologies in BPM}},
series = {Handbook of Research on Business Process Modeling},
publisher = {Information Science Publishing},
pages = {312--330},
type = {Article in Book},
month = {April},
year = {2009},
isbn = {978-1-60566-288-6},
keywords = {SBPM; BPEL4SWS; SOA; BPM; SWS},
language = {English},
cr-category = {H.4.1 Office Automation},
ee = {http://www.igi-global.com/reference/details.asp?ID=33287},
department = {University of Stuttgart, Institute of Architecture of Application Systems},
abstract = {Even though process orientation/BPM is a widely accepted paradigm with heavy
impact on industry and research the available technology does not support the
business professionals’ tasks in an appropriate manner that is in a way
allowing processes modeling using concepts from the business domain. This
results in a gap between the business people expertise and the IT knowledge
required. The current trend in bridging this gap is to utilize technologies
developed for the Semantic Web, for example ontologies, while maintaining
reusability and flexibility of processes. In this chapter the authors present
an overview of existing technologies, supporting the BPM lifecycle, and focus
on potential benefits Semantic Web technologies can bring to BPM. The authors
will show how these technologies help automate the transition between the
inherently separate/detached business professionals’ level and the IT level
without the burden of additional knowledge acquisition on behalf of the
business professionals. As background information they briefly discuss existing
process modeling notations like the Business Process Modeling Notation (BPMN)
as well as the execution centric Business Process Execution Language (BPEL),
and their limitations in terms of proper support for the business professional.
The chapter stresses on the added value Semantic Web technologies yield when
leveraged for the benefit of BPM. For this the authors give examples of
existing BPM techniques that can be improved by using Semantic Web
technologies, as well as novel approaches which became possible only through
the availability of semantic descriptions. They show how process model
configuration can be automated and thus simplified and how flexibility during
process execution is increased. Additionally, they present innovative
techniques like automatic process composition and auto-completion of process
models where suitable process fragments are automatically discovered to make up
the process model. They also present a reference architecture of a BPM system
that utilizes Semantic Web technologies in an SOA environment.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INBOOK-2009-02&engl=1}
}