@inproceedings {INPROC-2006-54,
author = {Thomas Schwarz and Matthias Grossmann and Daniela Nicklas and Bernhard Mitschang},
title = {{Exploiting Type and Space in a Main Memory Query Engine}},
booktitle = {Proceedings of the VIII Brazilian Symposium on GeoInformatics : GeoInfo2006 ; Campos do Jord{\~a}o, Brazil, November 19-22, 2006},
editor = {Clodoveu Augusto Davis Junior and Antonio Miguel Vieira Monteiro},
publisher = {INPE},
institution = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
pages = {35--52},
type = {Konferenz-Beitrag},
month = {November},
year = {2006},
isbn = {9 788517 000270},
keywords = {Main Memory Query Engine, Indexing, Spatial Index, Type Hierarchies, Deployable Query Engine},
language = {Englisch},
cr-category = {H.2.4 Database Management Systems,
H.3.1 Content Analysis and Indexing,
H.2.8 Database Applications},
ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2006-54/INPROC-2006-54.pdf},
contact = {Thomas Schwarz schwarts@ipvs.uni-stuttgart.de},
department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware},
abstract = {More and more spatial data is accessible over the web or through portals of
wireless service providers. In this context the main selection criteria for the
data are the type of the requested data objects and their position in the real
world. Integration and performance issues are challenged by the need to process
ad hoc queries in an interactive fashion. In this paper we investigate how a
main memory query engine can be used to meet these requirements. It has the
added benefit of being easily deployable to many components in a large-scale
data integration system. Hence, we analyze how such a query engine can best
exploit the query characteristics by employing an index structure that
leverages spatial and type dimensions.
In order to support query processing in the best possible way we investigate a
specific multi-dimensional main memory index structure. Compared to the
straightforward approach using separate indexes on type and position we can
increase the performance up to almost an order of magnitude in several
important usage scenarios. This requires to tweak the mapping of type IDs to
values in the type dimension, which we discuss extensively. This enables the
overall system to be used interactively, even with large data sets.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2006-54&engl=0}
}
@inproceedings {INPROC-2005-63,
author = {Joos-Hendrik B{\"o}se and Stefan B{\"o}ttcher and Le Gruenwald and Evaggelia Pitoura and Peter Reiher and George Samaras and Thomas Schwarz and Can T{\"u}rker},
title = {{04441 Working Group - Research Issues in Mobile Transactions}},
booktitle = {Mobile Information Management},
editor = {Margaret H. Dunham and Birgitta K{\"o}nig-Ries and Pitoura Evaggelia and Peter Reiher and Can T{\"u}rker},
address = {Schloss Dagstuhl, Germany},
publisher = {Internationales Begegnungs- und Forschungszentrum (IBFI},
institution = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
series = {Dagstuhl Seminar Proceedings},
volume = {04441},
type = {Konferenz-Beitrag},
month = {Januar},
year = {2005},
keywords = {Transactions; mobile clients; multi-hop wireless networks},
language = {Englisch},
cr-category = {H.2.4 Database Management Systems},
ee = {http://drops.dagstuhl.de/opus/volltexte/2005/168/},
department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware},
abstract = {This document discusses three scenarios for databases with mobile clients,
summarizes typical applications and requirements for each of the three
scenarios, and outlines the open research issues which should be solved within
each of the three scenarios. While the first scenario consists of mobile
clients that are connect to a wired network, the second scenario consists of a
network of mobile clients with a single-hop distance to each other but without
a wired network, and the third scenario considers a network of mobile clients
some of which are in multi-hop distance.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2005-63&engl=0}
}
@inproceedings {INPROC-2005-62,
author = {Susanne Boll and Martin Breunig and Nigel Davies and Christian S. Jensen and Birgitta K{\"o}nig-Ries and Rainer Malaka and Florian Matthes and Christoforo Panayiotou and Simonas Saltenis and Thomas Schwarz},
title = {{04441 Working Grou - Towards a Handbook for User-Centred Mobile Application Design}},
booktitle = {Mobile Information Management},
editor = {Margaret H. Dunham and Birgitta K{\"o}nig-Ries and Pitoura Evaggelia and Peter Reiher and Can T{\"u}rker},
address = {Schloss Dagstuhl, Germany},
publisher = {Internationales Begegnungs- und Forschungszentrum (IBFI},
institution = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
series = {Dagstuhl Seminar Proceedings},
volume = {04441},
type = {Konferenz-Beitrag},
month = {Januar},
year = {2005},
keywords = {User-Centred Mobile Application Design},
language = {Englisch},
cr-category = {D.2.10 Software Engineering Design},
ee = {http://drops.dagstuhl.de/opus/volltexte/2005/166},
department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware},
abstract = {Why do we have difficulties designing mobile apps? Is there a ``Mobile RUP''?},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2005-62&engl=0}
}
@inproceedings {INPROC-2005-04,
author = {Nicola H{\"o}nle and Uwe-Philipp K{\"a}ppeler and Daniela Nicklas and Thomas Schwarz},
title = {{Benefits Of Integrating Meta Data Into A Context Model}},
booktitle = {Proceedings of 2nd IEEE PerCom Workshop on Context Modeling and Reasoning (CoMoRea) (at 3rd IEEE International Conference on Pervasive Computing and Communication (PerCom'05)); Hawaii, March 12, 2005},
publisher = {IEEE},
institution = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
type = {Konferenz-Beitrag},
month = {M{\"a}rz},
year = {2005},
keywords = {meta data; context model; context-aware applications},
language = {Englisch},
cr-category = {H.2.1 Database Management Logical Design},
department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware;
Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Bildverstehen},
abstract = {Meta data—data about data—improves the value of the operational data by giving
applications and users additional information on the data’s origin, its
precision or staleness. We outline the benefits of modeling meta data in
context models: it can be used for resource finding, enhanced data selection,
trust and data quality issues and sensor fusion. We show how meta data included
into an object-based context model influences the data modeling and the
selection process in the query language. Finally, we describe our
implementation of the presented functionality in the Nexus platform.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2005-04&engl=0}
}
@inproceedings {INPROC-2005-03,
author = {Matthias Grossmann and Martin Bauer and Nicola H{\"o}nle and Uwe-Philipp K{\"a}ppeler and Daniela Nicklas and Thomas Schwarz},
title = {{Efficiently Managing Context Information for Large-scale Scenarios}},
booktitle = {Proceedings of the 3rd IEEE Conference on Pervasive Computing and Communications: PerCom2005; Kauai Island, Hawaii, March 8-12, 2005},
publisher = {IEEE Computer Society},
institution = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
type = {Konferenz-Beitrag},
month = {M{\"a}rz},
year = {2005},
language = {Englisch},
cr-category = {H.3.0 Information Storage and Retrieval General,
H.3.4 Information Storage and Retrieval Systems and Software},
ee = {http://www.nexus.uni-stuttgart.de},
contact = {matthias.grossmann@informatik.uni-stuttgart.de},
department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware;
Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Bildverstehen;
Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Verteilte Systeme},
abstract = {In this paper, we address the data management aspect of large-scale pervasive
computing systems. We aim at building an infrastructure that simultaneously
supports many kinds of context-aware applications, ranging from room level up
to nation level. This allembracing approach gives rise to synergetic benefits
like data reuse and sensor sharing. We identify major classes of context data
and detail on their characteristics relevant for efficiently managing large
amounts of it. Based on that, we argue that for large-scale systems it is
beneficial to have special-purpose servers that are optimized for managing a
certain class of context data. In the Nexus project we have implemented five
servers for different classes of context data and a very flexible federation
middleware integrating all these servers. For each of them, we highlight in
which way the requirements of the targeted class of data are tackled and
discuss our experiences.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2005-03&engl=0}
}
@inproceedings {INPROC-2004-42,
author = {Thomas Schwarz and Markus Iofcea and Matthias Grossmann and Nicola H{\"o}nle and Daniela Nicklas and Bernhard Mitschang},
title = {{On Efficiently Processing Nearest Neighbor Queries in a Loosely Coupled Set of Data Sources}},
booktitle = {Proceedings of the 12th ACM International Symposium on Advances in Geographic Information System (ACM GIS 004), Washington D.C., November 12-13, 2004},
editor = {ACM},
publisher = {?},
institution = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
type = {Konferenz-Beitrag},
month = {November},
year = {2004},
keywords = {Data integration, distributed query processing, federated database system, kNN, nearest neighbors, parallel query processing},
language = {Englisch},
cr-category = {H.2.4 Database Management Systems,
H.2.8 Database Applications,
H.3.3 Information Search and Retrieval},
ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2004-42/INPROC-2004-42.pdf},
contact = {thomas.schwarz@informatik.uni-stuttgart.de},
department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware},
abstract = {We propose a family of algorithms for processing nearest neighbor (NN) queries
in an integration middleware that provides federated access to numerous loosely
coupled, autonomous data sources connected through the internet. Previous
approaches for parallel and distributed NN queries considered all data sources
as relevant, or determined the relevant ones in a single step by exploiting
additional knowledge on object counts per data source. We propose a different
approach that does not require such detailed statistics about the distribution
of the data. It iteratively enlarges and shrinks the set of relevant data
sources. Our experiments show that this yields considerable performance
benefits with regard to both response time and effort. Additionally, we propose
to use only moderate parallelism instead of querying all relevant data sources
at the same time. This allows us to trade a slightly increased response time
for a lot less effort, hence maximizing the cost profit ratio, as we show in
our experiments. Thus, the proposed algorithms clearly extend the set of NN
algorithms known so far.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2004-42&engl=0}
}
@inproceedings {INPROC-2004-40,
author = {Thomas Schwarz and Nicola H{\"o}nle and Matthias Grossmann and Daniela Nicklas and Bernhard Mitschang},
title = {{Efficient Domain-Specific Information Integration in Nexus}},
booktitle = {Proceedings of the 2004 VLDB Workshop on Information Integration on the Web : IIWeb-2004 ; Toronto, Canada, August 30, 2004},
editor = {Hasan Davulcu and Nick Kushmerick},
publisher = {online},
institution = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
pages = {122--127},
type = {Konferenz-Beitrag},
month = {August},
year = {2004},
keywords = {Nexus; information integration; domain-specific},
language = {Englisch},
cr-category = {H.3.4 Information Storage and Retrieval Systems and Software,
H.3.3 Information Search and Retrieval},
ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2004-40/INPROC-2004-40.pdf,
http://cips.eas.asu.edu/iiwebfinalproceedings/52.pdf,
http://cips.eas.asu.edu/iiweb-proceedings.html},
contact = {thomas.schwarz@informatik.uni-stuttgart.de},
department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware},
abstract = {In this paper, we present the Nexus approach to efficient domain-specific
integration of many loosely coupled data sources. A so called information
maximizing mediation middleware (IMMM) has to cope with large data volumes and
many queries, and at the same time achieve a tight semantic integration for the
data instances. For efficiency and practicability reasons, we propose to use an
extensible global schema and a limited domain-specific query language. This
facilitates employing domain-specific semantic knowledge in the middleware:
detect duplicates, merge multiple representations, aggregate and generalize
information. Finally, we present a working prototype tailored to the domain of
context-aware applications.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2004-40&engl=0}
}
@inproceedings {INPROC-2004-24,
author = {Tobias Drosdol and Thomas Schwarz and Martin Bauer and Matthias Gro{\ss}mann and Nicola H{\"o}nle and Daniela Nicklas},
title = {{Keeping Track of ``Flying Elephants'': Challenges in Large-Scale Management of Complex Mobile Objects}},
booktitle = {Proceedings of INFORMATIK 2004 - the Thirty-Fourth Annual Conference of the Gesellschaft f{\"u}r Informatik e.V.(GI); Ulm, Germany, September 20-24, 2004. Vol. 1},
editor = {Peter Dadam and Manfred Reichert},
address = {Bonn},
publisher = {K{\"o}llen Druck+Verlag GmbH},
institution = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
series = {Lecture Notes in Informatics},
volume = {P-50},
pages = {288--292},
type = {Konferenz-Beitrag},
month = {September},
year = {2004},
isbn = {3-88579-379-2},
language = {Englisch},
cr-category = {C.2.4 Distributed Systems,
H.2.4 Database Management Systems,
H.2.8 Database Applications,
H.3.4 Information Storage and Retrieval Systems and Software},
contact = {Tobias Drosdol Tobias.Drosdol@informatik.uni-stuttgart.de},
department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware;
Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Verteilte Systeme},
abstract = {The management of mobile objects like cars, persons, or workpieces in a factory
is an important task in many context-aware environments. So far, most solutions
can either cope with many small objects (few properties) or with a limited
number of complex objects in a centralized way. In this paper, we face the
challenge of managing a large number of bulky mobile objects (flying
elephants). We state requirements, propose basic components, and discuss
alternative architectures based on the main influencing factors like mobility
and update rate.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2004-24&engl=0}
}
@inproceedings {INPROC-2004-19,
author = {Thomas Schwarz and Nicola H{\"o}nle and Matthias Gro{\ss}mann and Daniela Nicklas},
title = {{A Library for Managing Spatial Context Using Arbitrary Coordinate Systems}},
booktitle = {Workshop on Context Modeling and Reasoning : CoMoRea'04 ; In: Workshops-Proceedings of the 2nd IEEE Conference on Pervasice Computing and Communications : PerCom2004 ; Orlando, Florida, March 14-17, 2004},
publisher = {IEEE Computer Society},
institution = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
pages = {48--52},
type = {Konferenz-Beitrag},
month = {M{\"a}rz},
year = {2004},
keywords = {coordinate transformation, basic geometry types, spatial reference system, data integration, library for context-aware applications},
language = {Englisch},
cr-category = {I.3.5 Computational Geometry and Object Modeling,
H.2.8 Database Applications,
J.2 Physical Sciences and Engineering},
ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-2004-19/INPROC-2004-19.pdf,
http://nexus.informatik.uni-stuttgart.de/COMOREA/,
http://www.percom.org/percom_2004/index.htm,
http://www.nexus.uni-stuttgart.de/},
contact = {thomas.schwarz@informatik.uni-stuttgart.de},
department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware},
abstract = {Since location is an important part of context, the management of spatial
information is important for many context-aware applications, e.g. the position
or the extent of users, sensors, rooms or buildings. Coordinates always have a
coordinate system (CS) associated to them. Numerous CSs exist and a lot of them
are commonly used, thus conversion becomes a necessity. We introduce a library
that implements the OGC Simple Feature Specification and can dynamically cope
with different CSs, enabling interoperability between applications, middleware
components and data providers. We illustrate functions and features, describe a
common CS determination algorithm and point out our lessons learned: avoid
transformations, use existing standards but dare to extend them when needed.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2004-19&engl=0}
}
@inproceedings {INPROC-2003-16,
author = {Daniela Nicklas and Matthias Grossmann and Thomas Schwarz},
title = {{NexusScout: An Advanced Location-Based Application On A Distributed, Open Mediation Platform}},
booktitle = {Proceedings of the 29th VLDB Conference, Berlin, Germany, 2003},
publisher = {Morgan Kaufmann Publishers},
institution = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
pages = {0--1},
type = {Konferenz-Beitrag},
month = {September},
year = {2003},
isbn = {0-12-722442-4},
language = {Englisch},
cr-category = {A.0 General Literature, General},
department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware},
abstract = {This demo shows several advanced use cases of location-based services and
demonstrates how these use cases are facilitated by a mediation middleware for
spatial information, the Nexus Platform. The scenario shows how a mobile user
can access location-based information via so called Virtual Information Towers,
register spatial events, send and receive geographical messages or find her
friends by displaying other mobile users. The platform facilitates these
functions by transparently combining spatial data from a dynamically changing
set of data providers, tracking mobile objects and observing registered spatial
events.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2003-16&engl=0}
}
@inproceedings {INPROC-2001-72,
author = {Michael Kessler and Gundolf Kiefer and Jens Leenstra and Knut Schuenemann and Thomas Schwarz and Hans-Joachim Wunderlich},
title = {{Using a Hierarchical DfT Methodology in High Frequency Processor Designs for Improved Delay Fault Testability}},
booktitle = {Proceedings of the 32nd IEEE International Test Conference (ITC), Baltimore, MD, October 30-November 1, 2001},
publisher = {International Test Conference},
institution = {Universit{\"a}t Stuttgart, Fakult{\"a}t Informatik, Germany},
pages = {461--469},
type = {Konferenz-Beitrag},
month = {Oktober},
year = {2001},
isbn = {0-7803-7169-0},
issn = {1089-3539},
doi = {10.1109/TEST.2001.966663},
language = {Englisch},
cr-category = {B.8.1 Reliability, Testing, and Fault-Tolerance},
department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Informatik, Rechnerarchitektur},
abstract = {In this paper a novel hierarchical DfT methodology is presented which is
targeted to improve the delay fault testability for external testing and
scan-based BIST. After the partitioning of the design into high frequency
macros, the analysis for delay fault testability already starts in parallel
with the implementation at the macro level. A specification is generated for
each macro that defines the delay fault testing characteristics at the macro
boundaries. This specification is used to analyse and improve the delay fault
testability by improving the scan chain ordering at macro-level before the
macros are connected together into the total chip network. The hierarchical
methodology has been evaluated with the instruction window buffer core of an
out-of-order processor. It was shown that for this design practically no extra
hardware is required.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2001-72&engl=0}
}
@inproceedings {INPROC-2001-42,
author = {Michael Kessler and Gundolf Kiefer and Jens Leenstra and Knut Sch{\"u}nemann and Thomas Schwarz and Hans-Joachim Wunderlich},
title = {{Using a Hierarchical DfT Methodology in High Frequency Processor Designs for Improved Delay Fault Testability}},
booktitle = {Proceedings of the International Test Conference : ITC 2001 ; Baltimore, Maryland, October 30-November 1, 2001},
publisher = {IEEE Computer Society Press},
institution = {Universit{\"a}t Stuttgart, Fakult{\"a}t Informatik, Germany},
pages = {461--469},
type = {Konferenz-Beitrag},
month = {Oktober},
year = {2001},
isbn = {0-7803-7169-0},
keywords = {hierarchical; DfT; BIST; testability; scan chain reordering},
language = {Englisch},
cr-category = {B.8.1 Reliability, Testing, and Fault-Tolerance,
C.1 Processor Architectures,
C.4 Performance of Systems},
department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte H{\"o}chstleistungsrechner, Anwendersoftware;
Universit{\"a}t Stuttgart, Institut f{\"u}r Informatik, Rechnerarchitektur},
abstract = {In this paper a novel hierarchical DfT methodology is presented which is
targeted to improve the delay fault testability for external testing and
scan-based BIST. After the partitioning of the design into high frequency
macros, the analysis for delay fault testability already starts in parallel
with the implementation at the macro level. A specification is generated for
each macro that defines the delay fault testing characteristics at the macro
boundaries. This specification is used to analyse and improve the delay fault
testability by improving the scan chain ordering at macro-level before the
macros are connected together into the total chip network. The hierarchical
methodology has been evaluated with the instruction window buffer core of an
out-of-order processor. It was shown that for this design practically no extra
hardware is required.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2001-42&engl=0}
}
@inproceedings {INPROC-2001-41,
author = {Daniela Nicklas and Matthias Gro{\ss}mann and Thomas Schwarz and Steffen (ifp) Volz and Bernhard Mitschang},
title = {{A Model-Based, Open Architecture for Mobile, Spatially Aware Applications}},
booktitle = {Proceedings of the 7th International Symposium on Spatial and Temporal Databases: SSTD 2001; Redondo Beach, CA, USA, July 12-15, 2001},
editor = {Christian S. Jensen and Markus Schneider and Bernhard Seeger and Vassilis J. Tsotras},
address = {Berlin, Heidelberg, New York},
publisher = {Springer-Verlag},
institution = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
series = {Lecture Notes in Computer Science},
volume = {2121},
pages = {117--135},
type = {Konferenz-Beitrag},
month = {Juli},
year = {2001},
isbn = {3-540-42301-X},
keywords = {Mobile Computing; Location-Aware Applications; Augmented World Model},
language = {Englisch},
cr-category = {H.2.1 Database Management Logical Design,
H.3.4 Information Storage and Retrieval Systems and Software,
H.3.5 Online Information Services},
ee = {http://www.nexus.uni-stuttgart.de},
contact = {daniela.nicklas@informatik.uni-stuttgart.de, matthias.grossmann@informatik.uni-stuttgart.de, thomas.schwarz@informatik.uni-stuttgart.de, steffen.volz@ifp.uni-stuttgart.de},
department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte H{\"o}chstleistungsrechner, Anwendersoftware;
Universit{\"a}t Stuttgart, Institut f{\"u}r Photogrammetrie (ifp)},
abstract = {With the emerging availability of small and portable devices that are able to
determine their position and to communicate wirelessly, mobile and spatially
aware applications become feasible. These applications rely on information that
is bound to locations. In this paper we present Nexus, a platform for such
applications, which is open for both new applications and new information
providers, similar to the World Wide Web. Distributed servers provide
location-based information, which is federated to an integrated view for the
applications. To achieve this goal, we present the concept of the Augmented
World Model, which is a common data model for location-based information. We
give an example to show how applications can use this platform.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2001-41&engl=0}
}
@article {ART-2002-03,
author = {Steffen (ifp) Volz and Matthias Gro{\ss}mann and Nicola H{\"o}nle and Daniela Nicklas and Thomas Schwarz},
title = {{Integration mehrfach repr{\"a}sentierter Stra{\ss}enverkehrsdaten f{\"u}r eine f{\"o}derierte Navigation}},
journal = {it+ti},
publisher = {Oldenbourg Verlag},
volume = {44},
number = {5},
pages = {260--267},
type = {Artikel in Zeitschrift},
month = {Oktober},
year = {2002},
keywords = {Mobile Computing; Augmented World Model; GDF; ATKIS},
language = {Deutsch},
cr-category = {H.3.4 Information Storage and Retrieval Systems and Software,
H.2.1 Database Management Logical Design},
ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/ART-2002-03/ART-2002-03.pdf,
http://www.nexus.uni-stuttgart.de,
http://www.it-ti.de},
contact = {steffen.volz@ifp.uni-stuttgart.de, matthias.grossmann@informatik.uni-stuttgart.de, nicola.hoenle@informatik.uni-stuttgart.de, daniela.nicklas@informatik.uni-stuttgart.de, thomas.schwarz@informatik.uni-stuttgart.de},
department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte H{\"o}chstleistungsrechner, Anwendersoftware;
Universit{\"a}t Stuttgart, Institut f{\"u}r Photogrammetrie (ifp)},
abstract = {Die Forschergruppe Nexus entwickelt eine offene, verteilte Plattform f{\"u}r
Anwendungen mit Ortsbezug. Dieser Artikel beschreibt, wie Strassenverkehrsdaten
aus unterschiedlichen Quellen in das gemeinsame Datenmodell der Plattform
integriert werden k{\"o}nnen, um Navigationsanwendungen zu erm{\"o}glichen. Die
Abbildung mehrfach repr{\"a}sentierter Daten in einem einheitlichen Schema ist
notwendig, um Anfragen auf Quellen zu verteilen, die Ergebnisse
zusammenzufassen und so bestehende Daten weiter nutzen zu k{\"o}nnen.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2002-03&engl=0}
}
@article {ART-2001-07,
author = {Daniela Nicklas and Matthias Gro{\ss}mann and Thomas Schwarz and Steffen Volz},
title = {{Architecture and Data Model of Nexus}},
journal = {GIS Geo-Informations-Systeme},
address = {Heidelberg},
publisher = {Herbert Wichmann Verlag},
volume = {9},
pages = {20--24},
type = {Artikel in Zeitschrift},
month = {September},
year = {2001},
keywords = {Nexus, architecture, data model, location-based, federation, standard class schema, extended class schema},
language = {Englisch},
cr-category = {H.2.1 Database Management Logical Design,
H.3.4 Information Storage and Retrieval Systems and Software,
H.3.5 Online Information Services},
ee = {http://www.nexus.uni-stuttgart.de},
department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte H{\"o}chstleistungsrechner, Anwendersoftware;
Universit{\"a}t Stuttgart, Institut f{\"u}r Photogrammetrie (ifp)},
abstract = {The NEXUS platform delivers location-based information and provides additional
supporting services enabling intelligent location-based applications. Its
architecture is open for both new applications and new information providers,
similar to the WWW. The Augmented World Model is a common data model for
location-based information. Our platform uses this model to federate such
information from different providers into an integrated view for the
applications. An example application shows the usage of this platform.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2001-07&engl=0}
}
@inbook {INBOOK-2005-01,
author = {Bernhard Mitschang and Daniela Nicklas and Matthias Grossmann and Thomas Schwarz and Nicola H{\"o}nle},
title = {{Federating Location-Based Data Services}},
series = {Data Management in a Connected World: Essays Dedicated to Hartmut Wedekind on the Occasion of His 70th Birthday},
address = {Berlin},
publisher = {Springer-Verlag},
series = {Lecture Notes in Computer Science},
volume = {3551},
pages = {17--35},
type = {Beitrag in Buch},
month = {Juni},
year = {2005},
isbn = {3-540-26295-4},
keywords = {federation; context models; nexus; location-based services},
language = {Englisch},
cr-category = {H.2.4 Database Management Systems,
H.3.3 Information Search and Retrieval,
H.3.5 Online Information Services},
ee = {http://www.nexus.uni-stuttgart.de,
http://dx.doi.org/10.1007/11499923_2},
contact = {mitsch@informatik.uni-stuttgart.de},
department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Anwendersoftware},
abstract = {With the emerging availability of small and portable devices which are able to
determine their position and to communicate wirelessly, mobile and
spatially-aware applications become feasible. These applications rely on
information that is bound to locations and managed by so-called location-based
data services. Based on a classification of location-based data services we
introduce a service-oriented architecture that is built on a federation
approach to efficiently support location-based applications.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INBOOK-2005-01&engl=0}
}