Annual Report 2010 - Fachgruppe Informatik an der RWTH Aachen ...

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Theoretical Computer Science Staff • Group head Prof. Dr. Peter Rossmanith • Secretary Birgit Willms • Research Assistants Dr. rer. nat. Joachim Kneis Dipl.-Inform. Alexander Langer Dr. rer. nat. Daniel Meister (until April 2010) Somnath Sikdar, Ph.D. • Student Assistants Michael Nett Felix Reidl Fernando Sanchez Villaamil 72
Overview Our teaching and research profile mainly consists of • Efficient Algorithms • Parameterized Algorithms • Moderately Exponential Time Algorithms • Structural Graph Theory • Complexity Theory • Formalizing Mathematics • Analysis of Algorithms with an emphasis on the design and analysis of efficient algorithms. We are particularly interested in solving NP-hard problems. Many problems relevant in practice are in this category, and hence often solved by inexact methods that do not necessarily output the optimal solution, although in the case of approximation algorithms, there still is a guarantee of how close the computed solution is to the exact one. While approximation algorithms are often very useful, they frequently have a very large running time even for rather bad approximation ratios. On the other hand, sometimes exact solutions are asked for, and we concentrate on such exact algorithms. Research in the field of exact algorithms aims to improve the running time required to solve NP-hard problems, whether be it in practical applications or in its computational complexity. One method to tackle hard problems is to exploit structural properties of the underlying input instances. For instance, Courcelle's Theorem states that all problems that are definable in Monadic Second-Order logic (MSO) can be solved in linear time when the input is of bounded treewidth, a structural parameter originating in Robertson and Seymour's work on the famous Graph Minor Theorem. The techniques that are used in the proof of this theorem are however not always feasible in practice. One of our research projects therefore aims to obtain practical relevant algorithms for problems on graphs of bounded treewidth. Treewidth is a measure for undirected graphs and does not respect the direction of edges. The question whether similar results to that of Courcelle's Theorem can be shown for directed graphs has attracted a lot of attention in recent years. Many new width measures have been appeared, e.g., directed treewidth, entanglement, DAG-width, Kelly-width as well as directed generalizations of clique-width and rank-width, to name a few. All of these have in common that certain hard problems become easy when the respective measure is bounded. Yet, these width measures do not seem to be as successful as treewidth. Aiming to find an explanation, we found that a directed width measure that is substantially different from treewidth either cannot be as powerful as treewidth, i.e., unless P=NP there either can't be a similar result to Courcelle's Theorem, or the width measure lacks important structural properties. 73
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Annual Report 2010 Computer Science
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Contents Preface ..................
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Preface It is a long standing tradi
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Otto Spaniol’s Retirement After 2
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Moving back to the lighter side, tw
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Next on the agenda was a true innov
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Computer Science Summer Party - Som
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Bright Minds in Computer Science -
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To close the big gap between school
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Two special editions of Informatik
Page 25: Teaching 21
Page 28 and 29: subject it builds the four majors o
Page 30 and 31: Linear Algebra; Stochastics; Numeri
Page 32 and 33: Software Development), Computer Sci
Page 34 and 35: The International Master Programme
Page 36 and 37: annotation, and retrieval of spatia
Page 38 and 39: Proseminar: Ausgewählte Kapitel de
Page 40 and 41: Anwendung und Nutzen von Prozess- u
Page 42 and 43: Geometrieverarbeitung Kobbelt, Dekk
Page 44 and 45: Postgraduate Courses - Winter Term
Page 46 and 47: Engineering (GloSE) Softwaretechnik
Page 48 and 49: 05.11.2009: Wirtschaftliche Entwick
Page 50 and 51: VORNAME NACHNAME of Autosar) TITEL
Page 52 and 53: VORNAME NACHNAME TITEL Ferdi Kirmiz
Page 54 and 55: VORNAME NACHNAME TITEL Stephan Peit
Page 56 and 57: VORNAME NACHNAME TITEL Zeeshan Khan
Page 58 and 59: Overall Number of Students and Grad
Page 61 and 62: Algorithms and Complexity Staff •
Page 63 and 64: Overview Many technological innovat
Page 65 and 66: Dynamic Coordination in Large Netwo
Page 67 and 68: Design and Analysis of Algorithms i
Page 69 and 70: analyze distributed protocols for t
Page 71 and 72: Other Activities Courses Our group
Page 73 and 74: Talks and Publications Talks Alexan
Page 75: Jean Cardinal and Martin Hoefer. No
Page 79 and 80: The major goal of this project is t
Page 81 and 82: Other Activities Courses Our group
Page 83 and 84: Joachim Kneis, Daniel Meister, Jan
Page 85 and 86: D. Guck S. Herting C. Jansen M. Kam
Page 87 and 88: The group is happy to welcome Johan
Page 89 and 90: on efficient numerical methods and
Page 91 and 92: to the engineers and thus offer a c
Page 93 and 94: Project partners are universities,
Page 95 and 96: hybrid systems (SHS), which allows
Page 97 and 98: Synthesising of Model Based Testing
Page 99 and 100: and/or to prove the design correct.
Page 101 and 102: Erika Ábrahám: • Program commit
Page 103 and 104: Joost-Pieter Katoen. Abstraction of
Page 105 and 106: Erika Abraham, Ulrich Loup, Florian
Page 107 and 108: Daniela Lepri, Peter Csaba Ölveczk
Page 109 and 110: Overview Our research group is conc
Page 111 and 112: Termination Analysis for Logic and
Page 113 and 114: Automated Complexity Analysis J. Gi
Page 115 and 116: • Participant of the Workshop on
Page 117 and 118: Talks and Publications Talks C. Fuh
Page 119 and 120: Publications: Journals and Conferen
Page 121 and 122: Lars Noschinski. Automated Complexi
Page 123 and 124: • Externals Dipl.-Inform. M. Duka
Page 125 and 126: Funding comes from various sources,
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communication, the scheduling and i
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of personal data released to differ
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consumption status. A prototype of
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Global Software Engineering (GloSE)
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automatically computes testing metr
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important features of MontiCore’s
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Tool Integration for Heterogeneous
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Toolchain Integration in Requiremen
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demanded by several software houses
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REGINA-Arbeitskreis Cloud Computing
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• Member of the Program Committee
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Retkowitz, D.: Softwareunterstützu
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Berger, C., Rumpe, B.: Supporting A
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Software Construction Staff • Fac
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Research Projects Evaluating Busine
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Automatic Test Case Generation base
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Selection of Organisation Specific
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Talks and Publications Talks H. Lic
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Communication and Distributed Syste
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Overview In 2010 the former Chair I
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Research Projects Adaptive and Ligh
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• Establish ISO as lead organisat
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novel concept for Wi-Fi sharing com
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delegate certain tasks to other dev
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ability to store containers and cel
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UMIC Simulation Framework Georg Kun
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communication protocols on symbolic
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Other Activities Klaus Wehrle Progr
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Publications Aktas, I.; Otten, J.;
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Lora, M.A. (2010): QoE in Cooperati
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UMIC Mobile Network Performance Gro
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Research Projects Ultra-robust Wire
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Talks and Publications Talks J. Gro
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Information Systems Staff • Profe
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Overview Today, the field of Inform
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Future Mobile Internet Services: Mo
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part of the research initiative Ada
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DFG CONTici: Context Adaptive Inter
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state-of-the-art in human resource
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DAAD IKYDA: Non-linear Digital Stor
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infrastructures for scientific comm
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Models for Quality Management in Sc
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Other Activities Services Prof. Jar
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TEL’10, ICWL’10, Workshop STEG
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Talks and Publications Talks Y. Cao
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D. Kovachev: A Cloud Multimedia Pla
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Ralf Klamma, R. W. H. Lau, Shu-Chin
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Sandra Geisler, Christoph Quix, A.
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Zinayida Petrushyna, Ralf Klamma, M
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Knowledge-Based Systems & Cognitive
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Research Projects A Deliberative Re
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In the last three years we continuo
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implementation of the algorithm on
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esembling the branching time logic
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capture default reasoning mechanism
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Other Activities Program Committees
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Talks and Publications Talks Stefan
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Dipl.-Inform. M. Sundermeyer M.A. T
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• image recognition Most of these
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the most probable sentence. These m
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language understanding unit and a d
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Research Projects Global Autonomous
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The interpersonal communication pro
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B. J. Kröger, J. Kannampuzha, D. B
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Logic & Theory of Discrete Systems
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meeting of all German DFG-research
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surprising result that McNaughton
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exist practical algorithms for such
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• Member of the Evaluation Commit
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F. Radmacher: A Game for Reliable R
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[19] J. Olschewski and M. Ummels: T
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Overview The research group on Math
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combine logical and algebraic appro
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B. Puchala, Parity Games with Parti
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Computer Graphics and Multimedia Mo
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Overview The Chair of Computer Grap
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technologies for using recognition
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Practical Mixed-Integer Optimizatio
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A Sketching Interface for Feature C
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Generalized Use of Non-Terminal Sym
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Vision-Based Analysis and Reconstru
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SCRAMSAC: Improving RANSAC's Effici
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Ad-Hoc Multi-Displays for Mobile In
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Continuous Representation of Digita
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Level-Set Tracking for Automotive A
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Real-time Visual Object Detection P
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Other Activities Prof. Dr. Leif Kob
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• Member, Deutsche Arbeitsgemeins
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E. Horbert, Geometrically Constrain
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Data Management and Exploration Sta
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Data Analysis and Knowledge Extract
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prototypical one-cylinder engine fo
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Figure 5: OpenSubspace evaluation f
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Outlier Ranking in High Dimensional
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Relevance Feedback for the Explorat
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authenticate himself or herself in
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Other Activities Teaching Winter te
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Awards • Dipl.-Inform. Stephan G
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Assent I., Kremer H., Seidl T.: Spe
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Computer-Supported Learning Staff
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Overview Our focus in research and
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CoboCards GmbH and penetrated the E
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Daniel Herding presenting at DeLFI
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mathematics, computer science, natu
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The effect of the different measure
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Nadine Bergner • Co-organization
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Media Computing Group Staff • Fac
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Our group builds upon these results
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structure, and informal seating in
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The idea has been explored in three
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PinStripe: Eyes-free Continuous Inp
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Stacksplorer: Understanding Dynamic
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Our design rationale is to give the
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direct manipulation. Due to the sea
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Corona Many historical buildings ar
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CocoaHeads Since April 2008, we hav
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Talks and Publications Talks Usabil
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Christian Corsten. DragonFly: Spati
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• Guest Researcher:    Chak
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Research Projects [mc]square - Mode
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Synthesizing Best Transformers for
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UMIC Projects at i11 Carsten Weise
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Modelchecking Modular Protocols Car
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construction costs, the lack of sui
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Another issue in model-based develo
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Laboratory, RWTH) and Marco Roveri
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information from SNMP-based and fro
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Publications Biallas, S.; Brauer, J
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Schlich, B.; Brauer, J. & Kowalewsk
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Overview A recurring theme of the r
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Research Projects Over the past yea
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esearch groups: Applied Medical Eng
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Robust Shape Optimization for Artif
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• 1st Workshop on Automated Progr
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M. Lülfesmann. Computer-aided educ
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M. Probst, M. Lülfesmann, H. M. B
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Overview The focus of our research
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compute the gradient of the cost fu
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Waterways Engineering and Research
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methods to cases were our program r
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Other activities • Uwe Naumann is
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K. Rattanakornpunt, U. Naumann and
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• Student Researchers Dennis Effm
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Since recently, our research is als
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able to easily identify areas where
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VisPME - Visualization in Parallel
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With a novel VR-based modeling tool
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voxels with only a low number of pa
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Talks and Publications D. Holz: Soi
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D. Holz, T. Beer, T. Kuhlen (2009).
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Overview The research group IT-Secu
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Talks, Posters, and Publications Ta
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UMIC Mobile Network Performance Gro
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Research Projects Ultra-robust Wire
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Talks and Publications Talks J. Gro
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Parallel Programming Staff • Facu
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Research Activities Scalable Perfor
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Scalable Infrastructure for the Aut
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Other Activities Awards ICPP 2010 B
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Talks and Publications Talks M. Gei
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F. Wolf: Kranken Herzen helfen - In
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Wolfgang Frings, Felix Wolf, Ventsi
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Overview Paolo Bientinesi is Junior
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Other Activities Services Throughou
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Architectures. Accepted for publica
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Dissertations and Habilitations 453
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Social Software and Community Infor
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Personalized eHomes: Mobility, Priv
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Design Patterns for Safety-Critical
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Robust Machine Translation for Mult
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modeled together with its necessary
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Personalization in Technology Enhan
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A Log-Linear Discriminative Modelin
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Generic Modeling and Mapping Langua
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Evaluators: Prof. Dr. rer. nat. Ber
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Mechanisms, Models, and Tools for F
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Adaptive Multimodal Exploration of
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Discriminative Training and Acousti
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Channel Assignment and Security in
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Evaluators: Prof. Dr. Hermann Ney P
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for this problem the first polynomi
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Aspects of Wardrop Equilibria Lars
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Anonymous Communication in the Age
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World libraries : towards efficient
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On the Complexity of Equilibria in
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Energy-Efficient Design for Portabl
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Adaptable Transformation-Based Simi
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Finite Automata on Unranked Trees:
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Explicit checks are complemented by
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Central Services 501
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System Administration Group Staff
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The bandwidth increased significant
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What you can find in our library
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5. Bookcrossing: Since 2009, our li
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All these activities are made possi
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Co-operations 513
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Cluster of Excellence ”Ultra High
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The UMIC Workshop on Future Mobile
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UMIC Open Day 2010 The UMIC cluster
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Virtual Institute - High Productivi
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Bonn-Aachen International Center fo
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Graduiertenkollegs - Research Train
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Graduiertenkolleg ‘Software for M
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  The German University of Techno
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TGGS Thai-German Graduate School of
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Forum Information Technology at RWT
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Since January 2009, Bernhard Rumpe
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the framework of their respective p
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possible reseachs topics. This matr
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epresentation or, even better, real
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REGINA companies include world mark
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service integration capabilities ar
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