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

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existence and the complexity of equilibria in congestion games with such players. Some of our results can be extended to a class of general potential games and social cost functions, and we study a number of prominent examples. Evaluators: Prof. Dr. Berthold Vöcking Prof. Dr. Burkhard Monien Date of oral exam: 31 August 2010 492
Energy-Efficient Design for Portable Storages on Battery-Powered Computers Thitinan Tantidham This thesis focuses on energy efficiency design for different storage characteristics, e.g. between an internal-storage drive of a laptop computer and a portable-storage device. It studies the characteristics of battery packs and their lifetime by observing multiple systems. Furthermore, battery discharge models have been analyzed based on system utilization in terms of CPU utilization, frequency, and voltage considering CMOS power consumption basis and using regression method analysis. The accuracy of the model depends on regression coefficients, the measurement techniques due to instability of battery discharge rate and capacity, and the profile workloads. The proposed models are flexible to be applied to different systems with the available or unavailable value of the present rate provided by the smart battery. They can be used to estimate the remaining battery lifetime by giving the system utilization information. By developing time series models like moving average techniques, they can be used to estimate the battery lifetime together with the present rate given by the smart battery. Furthermore, the portable storage system architecture and characteristics of portable flash and magnetic disk storages are investigated. I/O workloads of portable storages can be classified into two categories: file transfer and data-access operation. A file transfer represents data backup applications or any long data transfer between a portable and a local storage drive. A data-access operation is intended for a portable application, an accessed file, or a database file, which requires a small number of I/O operations. The evaluation methodologies in the file system level for these two workloads have been observed by measurements, without description of hardware characteristics. The results reveal that flash storages provide better energy efficiency on a read file transfer in small file sizes as well as a random read access and a synchronous write access for small request sizes than disk storages do. Since flash storage has higher cost per bit than hard-disks and a finite number of erase-write cycles, they are better for allocating read-only files. In contrast, the disk storages outperform the flash storages for write operations, especially on a large file transfer, but their power consumption and performance highly depend on the spinning rate. Finally, the framework for power-aware data allocation management between a portable and a hard disk drive in the context of energy efficiency has been proposed. This framework supports two phases of power supply: AC or battery. In an AC power phase, storage maintenance operations, such as data defragmentation, virus scanning, software installation, backup, and file allocation, should be performed. As the file access patterns, by means of read-to-write ratio, random-to-sequential ratio, and I/O request size, are dependent on the applications and dynamic upon user access behaviours, the graphs with a mixture of different access patterns support the file-allocation making-decision schemes. In a battery-power phase, in order to maintain data service continuation during laptop’s battery exhaustion, data synchronization and backup from the local storage to the portable storage is periodically scheduled upon the specified failure rate, the remaining battery capacity, the file size, and the portable storage characteristics. Evaluators: Prof. Dr. Otto Spaniol (RWTH Aachen University) Assoc. Prof. Dr. Supachai Tangwongsan, Mahidol University Date of oral exam: 25 June 2010 493
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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
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Teaching 21
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subject it builds the four majors o
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Linear Algebra; Stochastics; Numeri
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Software Development), Computer Sci
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The International Master Programme
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annotation, and retrieval of spatia
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Proseminar: Ausgewählte Kapitel de
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Anwendung und Nutzen von Prozess- u
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Geometrieverarbeitung Kobbelt, Dekk
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Postgraduate Courses - Winter Term
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Engineering (GloSE) Softwaretechnik
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05.11.2009: Wirtschaftliche Entwick
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VORNAME NACHNAME of Autosar) TITEL
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VORNAME NACHNAME TITEL Ferdi Kirmiz
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VORNAME NACHNAME TITEL Stephan Peit
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VORNAME NACHNAME TITEL Zeeshan Khan
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Overall Number of Students and Grad
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Algorithms and Complexity Staff •
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Overview Many technological innovat
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Dynamic Coordination in Large Netwo
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Design and Analysis of Algorithms i
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analyze distributed protocols for t
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Other Activities Courses Our group
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Talks and Publications Talks Alexan
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Jean Cardinal and Martin Hoefer. No
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Overview Our teaching and research
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The major goal of this project is t
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Other Activities Courses Our group
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Joachim Kneis, Daniel Meister, Jan
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D. Guck S. Herting C. Jansen M. Kam
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The group is happy to welcome Johan
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on efficient numerical methods and
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to the engineers and thus offer a c
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Project partners are universities,
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hybrid systems (SHS), which allows
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Synthesising of Model Based Testing
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and/or to prove the design correct.
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Erika Ábrahám: • Program commit
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Joost-Pieter Katoen. Abstraction of
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Erika Abraham, Ulrich Loup, Florian
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Daniela Lepri, Peter Csaba Ölveczk
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Overview Our research group is conc
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Termination Analysis for Logic and
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Automated Complexity Analysis J. Gi
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• Participant of the Workshop on
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Talks and Publications Talks C. Fuh
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Publications: Journals and Conferen
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Lars Noschinski. Automated Complexi
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• Externals Dipl.-Inform. M. Duka
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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
Page 445 and 446: Talks and Publications Talks M. Gei
Page 447 and 448: F. Wolf: Kranken Herzen helfen - In
Page 449 and 450: Wolfgang Frings, Felix Wolf, Ventsi
Page 451 and 452: Overview Paolo Bientinesi is Junior
Page 453 and 454: Other Activities Services Throughou
Page 455 and 456: Architectures. Accepted for publica
Page 457 and 458: Dissertations and Habilitations 453
Page 459 and 460: Social Software and Community Infor
Page 461 and 462: Personalized eHomes: Mobility, Priv
Page 463 and 464: Design Patterns for Safety-Critical
Page 465 and 466: Robust Machine Translation for Mult
Page 467 and 468: modeled together with its necessary
Page 469 and 470: Personalization in Technology Enhan
Page 471 and 472: A Log-Linear Discriminative Modelin
Page 473 and 474: Generic Modeling and Mapping Langua
Page 475 and 476: Evaluators: Prof. Dr. rer. nat. Ber
Page 477 and 478: Mechanisms, Models, and Tools for F
Page 479 and 480: Adaptive Multimodal Exploration of
Page 481 and 482: Discriminative Training and Acousti
Page 483 and 484: Channel Assignment and Security in
Page 485 and 486: Evaluators: Prof. Dr. Hermann Ney P
Page 487 and 488: for this problem the first polynomi
Page 489 and 490: Aspects of Wardrop Equilibria Lars
Page 491 and 492: Anonymous Communication in the Age
Page 493 and 494: World libraries : towards efficient
Page 495: On the Complexity of Equilibria in
Page 499 and 500: Adaptable Transformation-Based Simi
Page 501 and 502: Finite Automata on Unranked Trees:
Page 503 and 504: Explicit checks are complemented by
Page 505 and 506: Central Services 501
Page 507 and 508: System Administration Group Staff
Page 509 and 510: The bandwidth increased significant
Page 511 and 512: What you can find in our library
Page 513 and 514: 5. Bookcrossing: Since 2009, our li
Page 515 and 516: All these activities are made possi
Page 517 and 518: Co-operations 513
Page 519 and 520: Cluster of Excellence ”Ultra High
Page 521 and 522: The UMIC Workshop on Future Mobile
Page 523 and 524: UMIC Open Day 2010 The UMIC cluster
Page 525 and 526: Virtual Institute - High Productivi
Page 527 and 528: Bonn-Aachen International Center fo
Page 529 and 530: Graduiertenkollegs - Research Train
Page 531 and 532: Graduiertenkolleg ‘Software for M
Page 533 and 534:   The German University of Techno
Page 535 and 536: TGGS Thai-German Graduate School of
Page 537 and 538: Forum Information Technology at RWT
Page 539 and 540: Since January 2009, Bernhard Rumpe
Page 541 and 542: the framework of their respective p
Page 543 and 544: possible reseachs topics. This matr
Page 545 and 546: 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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549
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