Publikationen BV: Bibliographie 2009 BibTeX
@inproceedings {INPROC-2009-78,
author = {Andreas Koch and Adam Berthelot and Bernd Eckstein and Oliver Zweigle and Kai H{\"a}ussermann and Uwe-Philipp K{\"a}ppeler and Andreas Tamke and Hamid Rajaie and Paul Levi},
title = {{Advanced data logging in RoboCup}},
booktitle = {Proceedings of the AMS 2009, Autonome Mobile Systeme, Karlsruhe, Germany, December 3-4, 2009},
editor = {Dillmann and Beyerer and Stiller and Z{\"o}llner},
address = {Karlsruhe, Germany},
publisher = {Springer Verlag},
institution = {Universit{\"a}t Stuttgart, Fakult{\"a}t Informatik, Elektrotechnik und Informationstechnik, Germany},
series = {Informatik Aktuell},
pages = {1--8},
type = {Konferenz-Beitrag},
month = {Dezember},
year = {2009},
isbn = {978-972-96895-3-6},
keywords = {overlay, augmented, camera, debugging, analysis, RoboCup, robot},
language = {Deutsch},
cr-category = {I.2.9 Robotics,
I.2.10 Vision and Scene Understanding},
ee = {http://www.ams2009.de},
department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Bildverstehen},
abstract = {In this work an advanced data logging approach for the RoboCup domain using an
autonomous camera man is presented. It includes approaches from the field of
real-time robot message logging, situation based camera control and 3D video
visualisation. Based on the implementation of this work the RoboCup team of the
IPVS of the University of Stuttgart won the first price in the scientific
challenge of the RoboCup World Championship 2009 in Graz.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2009-78&engl=0}
}
@inproceedings {INPROC-2009-77,
author = {Oliver Zweigle and Kai H{\"a}ussermann and Uwe-Philipp K{\"a}ppeler and Paul Levi},
title = {{Extended TA Algorithm for adapting a Situation Ontology}},
booktitle = {Proceedings of the FIRA RoboWorld Congress 2009, Progress in Robotics},
address = {Incheon, Korea},
publisher = {Springer Verlag},
institution = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
series = {Communications in Computer and Information Science},
volume = {44},
pages = {364--371},
type = {Konferenz-Beitrag},
month = {August},
year = {2009},
isbn = {978-3-642-03985-0},
keywords = {situation recognition, situation, bayes},
language = {Englisch},
cr-category = {I.2.6 Artificial Intelligence Learning},
ee = {http://www.springerlink.com/content/p4403084x0553717/},
department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Bildverstehen},
abstract = {In this work we introduce an improved version of a learning algorithm for the
automatic adaption of a situation ontology (TAA) which extends the basic
principle of the learning algorithm. The approach bases on the assumption of
uncertain data and includes elements from the domain of Bayesian Networks and
Machine Learning. It is embedded into the cluster of excellence Nexus at the
University of Stuttgart which has the aim to build a distributed context aware
system for sharing context data.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2009-77&engl=0}
}
@inproceedings {INPROC-2009-64,
author = {Matthias Wieland and Uwe-Philipp K{\"a}ppeler and Paul Levi and Frank Leymann and Daniela Nicklas},
title = {{Towards Integration of Uncertain Sensor Data into Context-aware Workflows}},
booktitle = {Tagungsband INFORMATIK 2009 – Im Focus das Leben, 39. Jahrestagung der Gesellschaft f{\"u}r Informatik e.V. (GI)},
editor = {GI-Edition Lecture Notes in Informatics (LNI)},
address = {L{\"u}beck},
publisher = {Lecture Notes in Informatics (LNI)},
institution = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
type = {Workshop-Beitrag},
month = {September},
year = {2009},
language = {Englisch},
cr-category = {H.4 Information Systems Applications},
department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Bildverstehen;
Universit{\"a}t Stuttgart, Institut f{\"u}r Architektur von Anwendungssystemen},
abstract = {The integration and usage of uncertain sensor data in workflows is a difficult
problem. In this paper we describe these difficulties which result from the
combination of very distinct areas. On the one hand, applications from area of
measurement engineering manage sensors that capture data and annotate the data
with technical meta data. On the other hand, context-aware workflows from the
BPM area place high level requirements for the quality of context data that is
derived from the sensor data. Between those two areas exists a gap that has to
be closed by a context management and mediation system, supporting the handling
of Quality of Context (QoC). To achieve this the paper presents an QoC aware
architecture based on an extension of the existing Nexus Platform and a first
approach for matching the workflow requirements with the sensor annotations.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2009-64&engl=0}
}
@inproceedings {INPROC-2009-61,
author = {Oliver Zweigle and Uwe-Philipp K{\"a}ppeler and Hamid Rajaie and Kai H{\"a}u{\ss}ermann and Andreas Tamke and Andreas Koch and Bernd Eckstein and Fabian Aichele and Paul Levi},
title = {{1. RFC Stuttgart Team Description 2009}},
booktitle = {RoboCup 2009 International Symposium},
editor = {TU Graz},
address = {Graz},
publisher = {TU Graz},
institution = {Universit{\"a}t Stuttgart, Fakult{\"a}t Informatik, Elektrotechnik und Informationstechnik, Germany},
pages = {1--8},
type = {Konferenz-Beitrag},
month = {Juni},
year = {2009},
keywords = {RoboCup; Robot; Soccer; RFC; Mid Size},
language = {Englisch},
cr-category = {I.2.9 Robotics,
I.2.10 Vision and Scene Understanding,
I.2.11 Distributed Artificial Intelligence},
ee = {http://www.robocup2009.org},
department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Bildverstehen},
abstract = {The 1. RFC Stuttgart robot soccer team is used as a testbed for multi-agent
software architecture principles in dynamic real time domains. The current
research activities focus on a completely new design of a midsize robot, the
enhancement of machine learning algorithms for strategies, new vision methods
and a context-aware visualization.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2009-61&engl=0}
}
@inproceedings {INPROC-2009-43,
author = {Partha Dutta and Viktor Avrutin and Michael Schanz and Soumitro Banerjee},
title = {{Multi-parametric bifurcations in a piecewise smooth map with square-root singularity}},
booktitle = {Proceedings of the National Conference on Nonlinear Systems \& Dynamics, Saha Institute of Nuclear Physics, Kolkota, India, March 5-7, 2009},
publisher = {Online},
institution = {Universit{\"a}t Stuttgart, Fakult{\"a}t Informatik, Elektrotechnik und Informationstechnik, Germany},
pages = {1--1},
type = {Konferenz-Beitrag},
month = {M{\"a}rz},
year = {2009},
keywords = {piecewise smooth map; multi-parametric bifurcation},
language = {Englisch},
cr-category = {J.2 Physical Sciences and Engineering},
ee = {http://www.cts.iitkgp.ernet.in/~ncnsd/Proceedings09/Paper/10.pdf},
contact = {Michael.Schanz@informatik.uni-stuttgart.de Viktor.Avrutin@informatik.uni-stuttgart.de},
department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Bildverstehen},
abstract = {Considering the concept of multi-parametric bifurcations, the piecewise smooth
linear normal form map can exhibit many typical bifurcation phenomena, which
can not be observed in smooth dynamical systems. In this paper we investigate
especially the interaction between smooth and non-smooth bifurcations in the
multi-parametric domain.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2009-43&engl=0}
}
@inproceedings {INPROC-2009-137,
author = {Oliver Zweigle and Kai H{\"a}ussermann and Uwe-Philipp K{\"a}ppeler and Paul Levi},
title = {{Supervised learning algorithm for automatic adaption of situation templates using uncertain data}},
booktitle = {Proceedings of the 2nd International Conference on Interaction Sciences: Information Technology, Culture and Human},
address = {New York, NY, USA},
publisher = {ACM},
institution = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
pages = {197--200},
type = {Konferenz-Beitrag},
month = {November},
year = {2009},
isbn = {978-1-60558-710-3},
language = {Englisch},
cr-category = {I.2.3 Deduction and Theorem Proving,
I.2.4 Knowledge Representation Formalisms and Methods,
I.2.5 Artificial Intelligence Programming Languages and Software,
I.2.6 Artificial Intelligence Learning,
I.2.8 Problem Solving, Control Methods, and Search},
department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Bildverstehen},
abstract = {In this paper a learning algorithm for the automatic adaption of a situation
template is presented. The approach strongly relies on human-machine
interaction as user feedback is a substantial part to automatically adapt a
global knowledgebase in this case. The work bases on the assumption of
uncertain data and includes elements from the domain of Bayesian Networks and
Machine Learning. It is embedded into the cluster of excellence Nexus at the
University of Stuttgart which has the aim to build a distributed context aware
user-friendly system for sharing context data.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2009-137&engl=0}
}
@inproceedings {INPROC-2009-134,
author = {Laura Gardini and Fabio Tramontana and Viktor Avrutin and Michael Schanz},
title = {{Improvment of the Leonov approach for border collision bifurcation curves}},
booktitle = {Proceedings of the 2009 International Workshop on Nonlinear Maps and their Applications (NOMA'09)},
publisher = {University of Urbino, INSA Toulouse, Tokushima University},
institution = {Universit{\"a}t Stuttgart, Fakult{\"a}t Informatik, Elektrotechnik und Informationstechnik, Germany},
pages = {43--46},
type = {Konferenz-Beitrag},
month = {September},
year = {2009},
keywords = {Border-collision bifurcations; Piecewise-smooth maps; Piecewise-linear maps},
language = {Englisch},
cr-category = {J.2 Physical Sciences and Engineering,
G.2 Discrete Mathematics},
contact = {Viktor.Avrutin@ipvs.uni-stuttgart.de Michael.Schanz@informatik.uni-stuttgart.de},
department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Bildverstehen},
abstract = {The study of bifurcations in a piecewise-smooth system is quite different from
those occurring in smooth systems. In piecewise-linear systems, which we are
considering in this paper, mainly border collision bifurcations (BCBs) and
contact bifurcations occur. It is classified as border-collision any contact
between an invariant set of a map with the border of its region of definition,
and this may, or may not, produce a bifurcation. The term border-collision
bifurcation was introduced for the first time by Nusse and Yorke in 1992 and is
now widely used in this context (i.e. for piecewise smooth maps). Recently,
these bifurcations have been studied mainly because of their relevant
applications in engineering (electrical and mechanical), and also in economics
and social sciences. In fact, several publications were motivated by models
describing particular circuits or models for the transmission of signals.
Remarkably also before the work by Nusse and Yorke the bifurcations associated
with piecewise smooth maps were studied in some publications (although the
bifurcations were not called border-collision bifurcations). We recall, for
example, the works by Mira (1978) and others. We may also go further back,
citing the work by Leonov in the end of 50th. In his work, Leonov described
several bifurcations, giving a recurrence relation to find the analytic
expressions of families of bifurcations occurring in a one-dimensional
piecewise linear map with one point of discontinuity, which is still mainly
unknown. The object of this work is to give a new interpretation and
improvements of some of his results.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2009-134&engl=0}
}
@inproceedings {INPROC-2009-133,
author = {Viktor Avrutin and Michael Schanz and Bj{\"o}rn Schenke},
title = {{On a bifurcation structure mimicking period adding}},
booktitle = {Proceedings of the 2009 International Workshop on Nonlinear Maps and their Applications (NOMA'09)},
publisher = {University of Urbino, INSA Toulouse, Tokushima University},
institution = {Universit{\"a}t Stuttgart, Fakult{\"a}t Informatik, Elektrotechnik und Informationstechnik, Germany},
pages = {72--77},
type = {Konferenz-Beitrag},
month = {September},
year = {2009},
keywords = {Border-collision bifurcations; Piecewise-smooth maps; Piecewise-linear maps},
language = {Englisch},
cr-category = {J.2 Physical Sciences and Engineering,
G.2 Discrete Mathematics},
department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Bildverstehen},
abstract = {In this work we investigate a piecewise-linear dis- continuous map defined on
three partitions. This map denoted as truncated tent map was specifically
constructed in such a way that it shows a similar dynamic behavior like a
piecewise- linear continuous map with an additional square root term with
positive sign derived from the time continuous model of an impact oscillator.
Since the square root part makes analytical studies complicated, the
constructed map serves us as an easy to investigate test system. The stable
periodic dynamics of this piecewise-linear map was found to be organized by a
heretofore unexplained bifurcation structure in an extended region in parameter
space, which superficially resembles period adding. This work explains the
stable periodic behavior of the truncated tent map and the new bifurcation
structure.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2009-133&engl=0}
}
@inproceedings {INPROC-2009-132,
author = {Viktor Avrutin and Michael Schanz and Bj{\"o}rn Schenke},
title = {{Floating regions within robust chaos}},
booktitle = {Proceedings of the 2009 International Workshop on Nonlinear Maps and their Applications (NOMA'09)},
publisher = {University of Urbino, INSA Toulouse, Tokushima University},
institution = {Universit{\"a}t Stuttgart, Fakult{\"a}t Informatik, Elektrotechnik und Informationstechnik, Germany},
pages = {67--71},
type = {Konferenz-Beitrag},
month = {September},
year = {2009},
keywords = {Crisis bifurcations; Piecewise-smooth maps; Piecewise-linear maps},
language = {Englisch},
cr-category = {J.2 Physical Sciences and Engineering,
G.2 Discrete Mathematics},
department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Bildverstehen},
abstract = {When dealing with piecewise-smooth systems, the chaotic domain is often robust,
that means does not contain any periodic inclusions. Recently, the bifurcation
structures in the robust chaotic domain of 1D piecewise-linear maps was
investigated. It was shown that several regions of multi-band chaotic
attractors emerge at the boundary between the periodic and the chaotic domain,
forming complex self-similar bifurcation structures. However, some multi-band
regions were observed also far away from this boundary. In this work we
consider the question how these regions emerge and how they become disconnected
from the boundary.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2009-132&engl=0}
}
@inproceedings {INPROC-2009-131,
author = {Viktor Avrutin and Michael Schanz and Laura Gardini},
title = {{Map replacement approach for calculation of bifurcation curves and its applicability conditions}},
booktitle = {Proceedings of the 2009 International Workshop on Nonlinear Maps and their Applications (NOMA'09)},
publisher = {University of Urbino, INSA Toulouse, Tokushima University},
institution = {Universit{\"a}t Stuttgart, Fakult{\"a}t Informatik, Elektrotechnik und Informationstechnik, Germany},
pages = {53--58},
type = {Konferenz-Beitrag},
month = {September},
year = {2009},
keywords = {Border-collision bifurcations; Piecewise-smooth maps; Piecewise-linear maps},
language = {Englisch},
cr-category = {J.2 Physical Sciences and Engineering,
G.2 Discrete Mathematics},
department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Bildverstehen},
abstract = {In this work we reconsider the approach suggested about 50 years ago (1959) in
a series of publications by N.N.Leonov for the calculation of border-collision
bifurcation curves in piecewise-linear maps. We extend this approach and
explain its applicability conditions.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2009-131&engl=0}
}
@inproceedings {INPROC-2009-121,
author = {L. Gardini and V. Avrutin and M. Schanz},
title = {{Connection between bifurcations on the Poincar'e Equator and the dangerous bifurcations}},
booktitle = {Proceedings of the European Conference on Iteration Theory (ECIT'08)},
editor = {Karl-Franzens-Universit{\"a}t Graz Institut f{\"u}r Mathematik},
address = {Graz, Austria},
publisher = {-},
institution = {Universit{\"a}t Stuttgart, Fakult{\"a}t Informatik, Elektrotechnik und Informationstechnik, Germany},
series = {Grazer Mathematische Berichte},
volume = {354},
pages = {53--72},
type = {Konferenz-Beitrag},
month = {Juli},
year = {2009},
issn = {1016-7692},
language = {Englisch},
cr-category = {J.2 Physical Sciences and Engineering},
department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Bildverstehen},
abstract = {The object of the present work is to describe some bifurcations occurring in
the 2D piecewise linear continuous map in canonical form involving the Poincare
Equator (i.e. periodic points at infinity) and its relation to the regions of
so called dangerous bifurcations (following Hassouneh et al. and Ganguli and
Banerjee). It will be shown that such regions are related not only to stable
fixed points and repelling saddle cycles, and a more general definition is
proposed. The boundaries of such regions are curves related to border collision
bifurcations of cycles on the Poincare Equator.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2009-121&engl=0}
}
@inproceedings {INPROC-2009-108,
author = {Paul Levi},
title = {{Development of Evolutionary and Self-Assembling Robot-Organisms}},
booktitle = {Proc. of 20th Anniversary MHS2009 \& Micro-Nano Global COE},
editor = {IEEE},
address = {Nagoya, Japan},
publisher = {-},
institution = {Universit{\"a}t Stuttgart, Fakult{\"a}t Informatik, Elektrotechnik und Informationstechnik, Germany},
pages = {1--6},
type = {Konferenz-Beitrag},
month = {November},
year = {2009},
isbn = {978-1-4244-5095-4},
keywords = {Collective robotics; symbiotic multicellular robots; artificial evolution; adaptability; synergetics; self-organization; swarm intelligence},
language = {Englisch},
cr-category = {I.2.9 Robotics,
I.2.10 Vision and Scene Understanding,
I.2.11 Distributed Artificial Intelligence},
department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Bildverstehen},
abstract = {Symbiotic robotics is a discipline within collective robotics that is concerned
with artificial multi-cellular robot-organisms that define their morphological
structure by aggregation through self-assembling and they are also able to
disaggregate afterwards. This contribution is concerned to the description of
evolutionary and cognitive principles that governs such a symbiotic cycle to
build artificial organisms of different forms and operate with them. The
evolutionary approach starts with a artificial genome, will be continued by the
insertion of different types of regulative cycles, and ends up in an
embryogenetic formed body. Hereby there is differentiation between the genetic
based learning and the fitness based learning. Further there are dominant
differences between multi-cellular organism and structured cooperative
aggregations of swarm members. The cognitive approach is focused on cognitive
maps, on cognitive sensor data fusion and finally to the definition of
information that governs the the process of organism formation and body
survival in a given environment. This more engineering oriented approach is
used to build all HW-components and all kinds of embedded {\^a}operating systems{\^a}
to control and to operate symbiotic robot organisms.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2009-108&engl=0}
}
@inproceedings {INPROC-2009-107,
author = {Viktor Avrutin and Michael Schanz},
title = {{Self-similarity of the bandcount adding: calculation by map replacement}},
booktitle = {Proceedings of the 2009 International Workshop on Nonlinear Maps and their Applications (NOMA'09)},
editor = {Italy University of Urbino and France INSA Toulouse and Japan Tokushima University},
publisher = {University of Urbino, INSA Toulouse, Tokushima University},
institution = {Universit{\"a}t Stuttgart, Fakult{\"a}t Informatik, Elektrotechnik und Informationstechnik, Germany},
pages = {62--66},
type = {Konferenz-Beitrag},
month = {September},
year = {2009},
keywords = {multi-band chaotic attractors; discontinuous maps; bandcount adding},
language = {Englisch},
cr-category = {G.1.0 Numerical Analysis General,
J.2 Physical Sciences and Engineering},
department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Bildverstehen},
abstract = {Recently it was demonstrated that the domain of robust chaos close to the
periodic domain, which is organized by the period-adding structure, contains an
infinite number of interior crisis bifurcation curves. These curves form the
so-called bandcount adding scenario, which determines the occurrence of
multi-band chaotic attractors. The analytical calculation of the interior
crisis bifurcations represents a quite sophisticated task. In this work we
demonstrate that, using the map replacement approach, much more bifurcation
curves can be calculated. Moreover, using this approach recursively, we confirm
the hypothesis regarding the self-similarity of the bandcount adding structure.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2009-107&engl=0}
}
@inproceedings {INPROC-2009-102,
author = {Uwe-Philipp K{\"a}ppeler and Andreas Gerhardt and Christian Schieberle and Matthias Wiselka and Kai H{\"a}ussermann and Oliver Zweigle and Paul Levi},
title = {{Reliable Situation Recognition based on Noise Levels}},
booktitle = {Proceedings of the First International Conference on Disaster Management and Human Health Risk, New Forest, September 23-25, 2009},
editor = {K. Duncan and C. A. Brebbia},
address = {New Forest, UK},
publisher = {WIT Press},
institution = {Universit{\"a}t Stuttgart : Sonderforschungsbereich SFB 627 (Nexus: Umgebungsmodelle f{\"u}r mobile kontextbezogene Systeme), Germany},
series = {WIT Transactions on the Built Environment},
volume = {110},
pages = {127--137},
type = {Konferenz-Beitrag},
month = {September},
year = {2009},
isbn = {978-1-84564-202-0},
keywords = {sensor data; noise levels; situation; recognition; regression; neural network; perceptron},
language = {Englisch},
cr-category = {I.2.6 Artificial Intelligence Learning,
G.3 Probability and Statistics},
department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Bildverstehen},
abstract = {Situation Recognition based on audio signals can be used to determine
situations in a meeting room while protecting the privacy by recording and
analyzing only the noise level instead of the complete audio signal.
A reliable situation recognition is normally obtained using Bayesian networks
which do not only rely on context information itself but additionally on
corresponding probabilities. Especially when the situation recognition itself
should output a quality rating to the determined situation it is necessary that
each analyzed information about all preconditions is rated with qualities or
probabilities. This leads to the need of a conversion from uncertainty to
probabilities when using sensor data to observe the environment to recognize
situations.
In this paper we compare different methods for situation recognition based on
noise level measurements. We implemented a Multilayer Perceptron Neural
Network, a simple empiric method and we describe the advantages of our method
based on multinomial logistic regression which we adapted to a reliable and
easily configurable situation recognition based on sensor data. To evaluate the
methods we distinguished between the situations {\^a}€œmeeting{\^a}€, {\^a}€œwork{\^a}€ and
{\^a}€œsilence{\^a}€ and recorded thousands of noise levels to calibrate and compare
the different methods against each other.
Our approach using logistic regression can be used as situation recognition
based on sensor data. It is not necessary that the input information contains
quality ratings but the system has to be calibrated with sensor data that can
be assigned to all the situations that have to be distinguished. Since the
result of this method contains probabilities to all situations it can also be
used to analyze sensor data related to single preconditions of complex
situation recognition algorithms based on Bayesian networks and different types
of context information.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-2009-102&engl=0}
}
@article {ART-2009-21,
author = {Ruben Benkmann and Uwe-Philipp K{\"a}ppeler and Oliver Zweigle and Reinhard Lafrenz and Paul Levi},
title = {{Resolving Inconsistencies Using Multi-Agent Sensor Systems}},
journal = {Robotica},
editor = {J. Noberto Pires},
address = {Coimbra},
publisher = {Engebook},
volume = {03/09},
number = {76},
pages = {22--27},
type = {Artikel in Zeitschrift},
month = {November},
year = {2009},
issn = {0874-9019},
keywords = {weighted arithmetic mean; clustering; data fusion; sensor},
language = {Englisch},
cr-category = {I.2.9 Robotics},
ee = {http://www.robotica.pt},
department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Bildverstehen},
abstract = {Agents acting in physical space use perception in combination with their own
world models and shared context models to orient. The shared context models
have to be adapted permanently to the conditions of the real world in dynamic
environments. If a measurement of an agent's sensor does not fit to the
corresponding data in the shared context model we get an inconsistency. In this
case it is necessary to decide whether the reason for the discrepancy is a
change in the real world or a measurement error. If there is a change in the
real world the shared context model has to be corrected. If the measurement is
erroneous it could be necessary to check the sensor. A single agent can hardly
answer this question using it's local world model. Extensive knowledge about
the represented world and the utilized sensors would be necessary. In this work
we examine the scenario of a context model that is shared with and updated by
many agents. In occurrence of an inconsistency it is possible to call other
agents to validate a measurement. The functions to call the other agents are
provided by the Nexus platform, a federation of systems that manages users and
objects in shared dynamic context models, integrates web technologies and
interfaces to the world wide web. We describe and evaluate procedures that
combine a multitude of measurements to a single result that can be integrated
in the shared context model. We enhanced the statistically optimized procedure
based on ratings of the participating agents. The procedure is altered so that
the system can recover from running into singularities caused by the feedback
from the ratings. In addition we describe a preprocessing based on fuzzy
clustering that detects aberrant measurements which are excluded from further
processing.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2009-21&engl=0}
}
@article {ART-2009-01,
author = {Viktor Avrutin and Bernd Eckstein and Michael Schanz},
title = {{The bandcount increment scenario. III. Deformed structures}},
journal = {Proceedings of the Royal Society A},
publisher = {Royal Society Publishing},
volume = {465},
number = {2101},
pages = {41--57},
type = {Artikel in Zeitschrift},
month = {Januar},
year = {2009},
doi = {10.1098/rspa.2008.0229},
keywords = {multi-band chaotic attractors; discontinuous maps; bandcount increment; bandcount adding; bandcount doubling},
language = {Englisch},
cr-category = {G.1.0 Numerical Analysis General,
J.2 Physical Sciences and Engineering},
contact = {Michael.Schanz@informatik.uni-stuttgart.de Viktor.Avrutin@informatik.uni-stuttgart.de},
department = {Universit{\"a}t Stuttgart, Institut f{\"u}r Parallele und Verteilte Systeme, Bildverstehen},
abstract = {Bifurcation structures in two-dimensional parameter spaces formed by chaotic
attractors alone are still far away from being understood completely. In a
series of three papers, we investigate the chaotic domain without periodic
inclusions for a map, which is considered by many authors as some kind of
one-dimensional canonical form for discontinuous maps. In part I, the basic
structures in the chaotic region are explained by the bandcount increment
scenario. In part II, the fine self-similar sub-structures nested into the
bandcount increment scenario are explained by the bandcount adding and
bandcount doubling scenarios, nested into each other ad infinitum. Hereby we
fixed in both previous parts one of the parameters to a non-generic value and
studied the remaining two-dimensional parameter sub-space. In this part III
finally we investigate the structures under variation of this third parameter.
Remarkably, this step is most important with respect to practical applications,
since it can not be expected, that they operate exactly at this non-generic
value.},
url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-2009-01&engl=0}
}
