@inproceedings {INPROC-2007-48,
author = {Marcus Handte and Klaus Herrmann and Gregor Schiele and Christian Becker and Kurt Rothermel},
title = {{Automatic Reactive Adaptation of Pervasive Applications}},
booktitle = {Proceedings of ICPS'07: IEEE International Conference on Pervasive Services},
publisher = {IEEE Computer Society Press},
institution = {Universit{\"a}t Stuttgart, Fakult{\"a}t Informatik, Elektrotechnik und Informationstechnik, Germany},
pages = {214--222},
type = {Konferenz-Beitrag},
month = {Juli},
year = {2007},
keywords = {adaptivity, components, mobility, optimization},
language = {Englisch},
cr-category = {C.2.4 Distributed Systems},
ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2007-48/INPROC-2007-48.pdf},
department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Verteilte Systeme},
abstract = {Pervasive Computing envisions seamless and distraction-free support for
everyday tasks through distributedapplications that leverage the resources of
the users' environment. Due to the mobility of users and devices, applications
need to adapt continuously to their changing execution environment. Therefore,
developers need a suitable framework in order to efficiently create adaptive
applications. In this paper, we present and evaluate our approach to adapting a
pervasive computing application to changes during its execution. This work is
based on the minimal component system PCOM and on an algorithm to fully
automate the initial configuration of a componentbased application which we
have presented in earlier work. The contribution of this paper is threefold.
First, we describe a number of modifications to the component model that are
required to enable fully automatic adaptation. Secondly, we propose a simple
yet powerful cost model to capture the complexity of specific adaptations.
Thirdly, we describe an online optimization heuristic that extends our
distributed configuration algorithm in order to choose to a low-cost
configuration whenever the current configuration of a pervasive application
requires adaptation.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2007-48&engl=0}
}
@inproceedings {INPROC-2007-13,
author = {Marcus Handte and Klaus Herrmann and Gregor Schiele and Christian Becker},
title = {{Supporting Pluggable Configuration Algorithms in PCOM}},
booktitle = {Perware Workshop at 5th IEEE International Conference on Pervasive Computing and Communications (PerCom)},
address = {New York, USA},
publisher = {IEEE},
institution = {Universit{\"a}t Stuttgart, Fakult{\"a}t Informatik, Elektrotechnik und Informationstechnik, Germany},
pages = {472--476},
type = {Konferenz-Beitrag},
month = {M{\"a}rz},
year = {2007},
language = {Englisch},
cr-category = {D.2.11 Software Engineering Software Architectures,
D.1.2 Automatic Programming},
ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2007-13/INPROC-2007-13.pdf,
http://dx.doi.org/10.1109/PERCOMW.2007.111},
department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Verteilte Systeme},
abstract = {Pervasive Computing envisions distributed applications that optimally leverage
the resources present in their ever-changing execution environment. To ease the
development of pervasive applications, we have created a pervasive component
system (PCOM). PCOM automates the configuration and runtime adaptation of a
component-based application using a builtin distributed configuration
algorithm. In this paper, we present an architectural extension that allows
switching between different algorithms. This enables PCOM to dynamically select
an algorithm that suits the computational resources present in an environment.
To validate the extended architecture, we compare the overheads of a
distributed and a centralized configuration algorithm in two different
environments.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2007-13&engl=0}
}
@inproceedings {INPROC-2007-12,
author = {Gregor Schiele and Marcus Handte and Christian Becker},
title = {{Good Manners for Pervasive Computing - An Approach Based on the Ambient Calculus}},
booktitle = {WIP Track at 5th IEEE International Conference on Pervasive Computing and Communications (PerCom)},
address = {New York, USA},
publisher = {IEEE},
institution = {Universit{\"a}t Stuttgart, Fakult{\"a}t Informatik, Elektrotechnik und Informationstechnik, Germany},
pages = {589--593},
type = {Konferenz-Beitrag},
month = {M{\"a}rz},
year = {2007},
language = {Englisch},
cr-category = {D.2.7 Software Engineering Distribution, Maintenance, and Enhancement},
department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Verteilte Systeme},
abstract = {When people interact, they follow distinct rules that coordinate the order of
speech, who opens doors, whom and how to greet, and many things more. Such a
social codex depends on the milieu -- or ambience -- people are acting in.
People breaking the codex are either considered badly educated or foreigners to
the ambience -- sometimes even both. In Pervasive Computing a multitude of
applications is expected to populate our environment and to follow objects and
users throughout their daily journey. Consequently, we will need a new codex --
or manners -- for Pervasive Computing applications that controls the
interaction between applications. Such a codex will have to incorporate our
existing codices as well as technical aspects. In this work in progress paper
we present an approach to extend our prior work on Pervasive Computing system
support by specifying interdependencies of applications based on the ambient
calculus. This allows specifying and technically enforcing ``manners'' for
Pervasive Computing applications.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2007-12&engl=0}
}
@inproceedings {INPROC-2006-73,
author = {Stephan Urbanski and Marcus Handte and Gregor Schiele and Kurt Rothermel},
title = {{Experience using Processes for Pervasive Computing}},
booktitle = {Pervasive University Workshop at Informatik 2006},
editor = {GI},
publisher = {GI},
institution = {Universit{\"a}t Stuttgart, Fakult{\"a}t Informatik, Elektrotechnik und Informationstechnik, Germany},
pages = {1--5},
type = {Konferenz-Beitrag},
month = {Oktober},
year = {2006},
language = {Englisch},
cr-category = {D.2.11 Software Engineering Software Architectures},
department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Verteilte Systeme},
abstract = {Pervasive Computing envisions seamless computing support for users while
performing their everyday tasks. Many of these tasks are hard to capture by the
notion of a single application as their requirements on computing support vary
over time. To ease the development of applications for such tasks, we have
designed an application model for process-oriented pervasive applications,
called Sentient Processes, and a supporting middleware system implementing the
flow control for processes. In this paper, we show the capabilities of the
Sentient Process model to capture everyday user tasks by the example of a
process supporting a student in managing his classes during a term.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2006-73&engl=0}
}
@inproceedings {INPROC-2005-72,
author = {Marcus Handte and Gregor Schiele and Stephan Urbanski and Christian Becker},
title = {{Adaptation Support for Stateful Components in PCOM}},
booktitle = {Workshop on Software Architectures for Self-Organization: Beyond Ad-Hoc Networking at Pervasive 2005, M{\"u}nchen, Germany, 2005},
publisher = {-},
institution = {Universit{\"a}t Stuttgart, Fakult{\"a}t Informatik, Elektrotechnik und Informationstechnik, Germany},
pages = {1--5},
type = {Konferenz-Beitrag},
month = {Mai},
year = {2005},
keywords = {Adaptation, Stateful Services},
language = {Deutsch},
cr-category = {D.2.7 Software Engineering Distribution, Maintenance, and Enhancement},
department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Verteilte Systeme},
abstract = {In ever-changing environments as they are envisioned in Pervasive Computing,
applications have to adapt to changes in their execution environment.
Reselection of services is a common technique for stateless services. This
paper presents an approach that allows reselection of stateful services by
combining checkpointing techniques and client-side request histories. An
implementation that allows transparent service reselection is outlined and
parameters for the automatic creation of checkpoints are discussed.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2005-72&engl=0}
}
@inproceedings {INPROC-2004-86,
author = {Christian Becker and Marcus Handte and Gregor Schiele and Kurt Rothermel},
title = {{PCOM - A Component System for Pervasive Computing}},
booktitle = {Proceedings of the Second IEEE International Conference on Pervasive Computing and Communications},
publisher = {IEEE Computer Society},
institution = {Universit{\"a}t Stuttgart, Fakult{\"a}t Informatik, Elektrotechnik und Informationstechnik, Germany},
pages = {67--77},
type = {Konferenz-Beitrag},
month = {M{\"a}rz},
year = {2004},
keywords = {pervasive computing; ubiquitous computing; system software; component system; 3PC},
language = {Deutsch},
cr-category = {C.2.4 Distributed Systems},
department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Verteilte Systeme},
abstract = {Applications in the Pervasive Computing domain are challenged by the dynamism
in which their execution environment changes, e.g. due to user mobility. As a
result, applications have to adapt to changes regarding their required
resources. In this paper we present PCOM, a component system for Pervasive
Computing. PCOM offers application programmers a high-level programming
abstraction which captures the dependencies between components using contracts.
The resulting application architecture is a tree formed by components and their
dependencies. PCOM supports automatic adaptation in cases where the execution
environment changes to the better or to the worse. User supplied as well as
system provided strategies take users out of the control loop while offering
flexible adaptation control.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2004-86&engl=0}
}
@inproceedings {INPROC-2004-27,
author = {Gregor Schiele and Christian Becker and Kurt Rothermel},
title = {{Energy-Efficient Cluster-based Service Discovery}},
booktitle = {Proceedings of the 11th ACM SIGOPS European Workshop (SIGOPSEW04); Leuven, Belgium, September 20-22, 2004},
publisher = {ACM SIGOPS},
institution = {Universit{\"a}t Stuttgart, Fakult{\"a}t Informatik, Elektrotechnik und Informationstechnik, Germany},
pages = {75--79},
type = {Konferenz-Beitrag},
month = {September},
year = {2004},
keywords = {SANDMAN; service discovery; energy-efficient; energy-aware},
language = {Englisch},
cr-category = {C.2.4 Distributed Systems},
contact = {gregor.schiele@informatik.uni-stuttgart.de},
department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Verteilte Systeme},
abstract = {Service discovery in Ubiquitous Computing is a task which has to be done
frequently due to dynamically changing environments. The limited battery power
of mobile devices requires us to optimize frequent and energy costly tasks,
especially the ones incurring in communication activities. In this paper we
present a novel service discovery algorithm based on node clustering. Nodes
within a cluster may sleep to save energy when idle. A clusterhead node is
always active and answers discovery requests on behalf of other nodes to
achieve low discovery latencies. Simulation experiments show energy savings of
up to 66\% compared to an approach where all nodes are permanently active while
the discovery latencies were not increased.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2004-27&engl=0}
}
@inproceedings {INPROC-2003-26,
author = {Marcus Handte and Christian Becker and Gregor Schiele},
title = {{Experiences: Minimalism and Extensibility in BASE}},
booktitle = {Proceedings of the System Support for Ubiquitous Computing Workshop (Ubisys03) at the Fifth Annual Conference on Ubiquitous Computing (Ubicomp03); Seattle, Washington, October 12, 2003},
publisher = {online proceedings},
institution = {Universit{\"a}t Stuttgart, Fakult{\"a}t Informatik, Elektrotechnik und Informationstechnik, Germany},
pages = {1--8},
type = {Konferenz-Beitrag},
month = {Oktober},
year = {2003},
keywords = {micro-broker; BASE; PCOM; 3PC; ubiquitous computing; pervasive computing; middleware},
language = {Englisch},
cr-category = {C.2.4 Distributed Systems,
D.2.11 Software Engineering Software Architectures,
D.2.12 Software Engineering Interoperability,
D.4.4 Operating Systems Communications Management},
ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2003-26/INPROC-2003-26.pdf,
http://ciae.cs.uiuc.edu/ubisys/program.html,
http://ciae.cs.uiuc.edu/ubisys/},
department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Verteilte Systeme},
abstract = {In the vision of Ubiquitous Computing everyday objects become smart.
Technically, this requires some sort of processing and communication
technology. We have designed and implemented a middleware for spontaneous
networking in Ubiquitous Computing environments. The major objectives were
minimalism and extensibility in order to deploy the middleware on a variety of
devices ranging from sensor nodes to classical general purpose computers. In
this paper we will assess the taken approach based on two follow-up projects:
the port of BASE to a small embedded system and the design and implementation
of a component system on top of BASE. While the fundamental concepts and design
principles of BASE have proven to be solid, both projects provided insights
that led to minor conceptual and major technical changes.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2003-26&engl=0}
}
@inproceedings {INPROC-2003-13,
author = {Christian Becker and Gregor Schiele and Holger Gubbels and Kurt Rothermel},
title = {{BASE - A Micro-broker-based Middleware For Pervasive Computing}},
booktitle = {Proceedings of the First IEEE International Conference on Pervasive Computing and Communication (PerCom), March 23-26, Fort Worth, USA},
address = {Los Alamitos},
publisher = {IEEE Computer Society},
institution = {Universit{\"a}t Stuttgart, Fakult{\"a}t Informatik, Elektrotechnik und Informationstechnik, Germany},
pages = {443--451},
type = {Konferenz-Beitrag},
month = {M{\"a}rz},
year = {2003},
isbn = {0-7695-1895},
keywords = {Middleware, Ubiquitous Computing, Microbroker, Micro-broker, BASE},
language = {Englisch},
cr-category = {C.2.4 Distributed Systems},
ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2003-13/INPROC-2003-13.pdf},
department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Verteilte Systeme},
abstract = {Pervasive computing environments add a multitude of additional devices to our
current computing landscapes. Specialized embedded systems provide sensor
information about the real world or offer a distinct functionality, e.g.
presentation on a “smart wall”. Spontaneous networking leads to constantly
changing availability of services. This requires middleware support to ease
application development. Additionally, we argue that an extensible middleware
platform covering small embedded systems to full-fledged desktop computers is
needed. Such a middleware should provide easy-to-use abstractions to access
remote services and device-specific capabilities. We present a micro-broker-
based approach which meets these requirements by allowing uniform access to
device capabilities and services through proxies and the integration of
different interoperability protocols. A minimum configuration of the middleware
can be executed on embedded systems. Resource-rich execution environments are
supported by the extensibility of the middleware.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2003-13&engl=0}
}
@inproceedings {INPROC-2003-11,
author = {Christian Becker and Gregor Schiele},
title = {{Middleware and Application Adaptation Requirements and their Support in Pervasive Computing}},
booktitle = {Proceedings of the 23rd International Conference on Distributed Computing Systems Workshops (ICDCS 2003), 3rd International Workshop on Distributed Auto-adaptive and Reconfigurable Systems (DARES), Providence, USA, May 19-22},
address = {Los Alamitos},
publisher = {IEEE Computer Society},
institution = {Universit{\"a}t Stuttgart, Fakult{\"a}t Informatik, Elektrotechnik und Informationstechnik, Germany},
pages = {98--103},
type = {Konferenz-Beitrag},
month = {Mai},
year = {2003},
isbn = {0-7695-1921-0},
language = {Englisch},
cr-category = {C.2.4 Distributed Systems},
ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2003-11/INPROC-2003-11.pdf},
contact = {Email an christian.becker@informatik.uni-stuttgart.de oder gregor.schiele@informatik.uni-stuttgart.de},
department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Verteilte Systeme},
abstract = {Pervasive computing environments are characterized by an additional
heterogeneity compared to existing computing infrastructures. Devices ranging
from small embedded systems to full-fledged computers are connected via
spontaneously formed networks. In this paper we analyze requirements of
applications and system software to cope with the dynamically changing
execution environment. Based on our micro-broker-based middleware BASE a
component framework for pervasive computing supporting application adaptation
is proposed.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2003-11&engl=0}
}
@inproceedings {INPROC-2003-09,
author = {Martin Bauer and Christian Becker and J{\"o}rg H{\"a}hner and Gregor Schiele},
title = {{ContextCube - Providing Context Information Ubiquitously}},
booktitle = {Proceedings of the 23rd International Conference on Distributed Computing Systems Workshops (ICDCS 2003)},
address = {Los Alamitos},
publisher = {IEEE Computer Society},
institution = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
pages = {308--313},
type = {Konferenz-Beitrag},
month = {Mai},
year = {2003},
isbn = {0-7695-1921-0},
language = {Englisch},
cr-category = {H.3.4 Information Storage and Retrieval Systems and Software},
ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2003-09/INPROC-2003-09.pdf,
http://www.nexus.uni-stuttgart.de},
department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Verteilte Systeme},
abstract = {Sensing the state of the environment is an important source for context-aware
applications. Several approaches exist to provide sensor information to mobile
application nodes. As the extreme cases we have pure infrastructures and pure
ad hoc networks. In order to allow sensor platforms to serve both of these
approaches, we have designed a universal sensor platform and integrated it into
an infrastructure-based approach as well as into ad hoc networks. In this paper
we discuss the requirements on such a platform, the design, and the
experiences.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2003-09&engl=0}
}
@inproceedings {INPROC-2001-46,
author = {Christian Becker and Gregor Schiele},
title = {{New mechanisms for routing in ad hoc networks}},
booktitle = {Proceedings of the Fourth CaberNet Plenary Workshop; Pisa, Italy, October 9-11, 2001.},
publisher = {not available},
institution = {Universit{\"a}t Stuttgart, Fakult{\"a}t Informatik, Germany},
type = {Konferenz-Beitrag},
month = {Oktober},
year = {2001},
keywords = {mobile ad hoc routing; model based routing; user profiles},
language = {Englisch},
cr-category = {C.2.2 Network Protocols},
contact = {gregor.schiele@informatik.uni-stuttgart.de},
department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte H{\"o}chstleistungsrechner, Verteilte Systeme},
abstract = {Routing in ad hoc networks is challenged by mobility and dynamics of mobile
devices. Hence, classic routing algorithms hardly cope with partitions and
constant topology changes in such networks. Existing routing algorithms are
based on flooding to explore a location or known node locations. In this paper
we present an approach based on additional information available in such
networks that will help to reduce the network load without relying on known
receiver locations.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2001-46&engl=0}
}