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IEEE International Conference on Performance, Computing and communications (IPCCC)

作者： L. Bulej T. Kalibera P. Tuma Distributed Systems Research Group Department of Software Engineering Charles University Prague Czech Republic Institute of Computer Science Academy of Sciences슠of the슠Czech Republic Prague Czech Republic

The paper introduces the concept of regression benchmarking as a variant of regression testing focused at detecting performance regressions. Applying the regression benchmarking in the area of middleware development, the paper explains how regression benchmarking differs from middleware benchmarking in general. On a real-world example of TAO, the paper shows why the existing benchmarks do not give results sufficient for regression benchmarking, and proposes techniques for detecting performance regressions using simple benchmarks.

关键词： Middleware Benchmark testing Software testing System testing Quality assurance Software systems Software engineering Mathematics Physics computer science

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Adaptive multimedia multi-party communication in ad hoc environments

Adaptive multimedia multi-party communication in ad hoc envi...

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Annual Hawaii International Conference on System sciences (HICSS)

作者： P.M. Ruiz J.A. Sanchez E. Garcia A.E. Gomez-Skarmeta J.A. Botia A. Kassler T. Guenkova-Luy Agora Systems S. A. Madrid Spain Campus de Espinardo University of Murcia Murcia Spain Department of Distributed Systems Faculty of Computer Science University of Ulm (EBS) Germany SCE Nanyang Technological University Singapore

Adaptivity is a key issue for enhanced multimedia communication in wireless environments, where the network QoS for a whole session cannot be guaranteed. Within this paper we propose a set of mechanisms to provide adaptive multimedia multi-party communication according to user-defined QoS levels over self-organizing ad hoc network extensions connected to IP access networks. We use special extensions to SIP/SDPng based on XML to negotiate alternative application defined QoS levels and adaptation paths and optionally couple local resource management with network layer QoS. At the network layer, we propose the MMARP (Multicast MANET Routing Protocol) which provides efficient multicast communications within ad hoc network extension to public infrastructure based access networks. MMARP is able to deal with the complexity of supporting traditional IP nodes whilst inter-operating smoothly with fixed IP networks. An adaptive application architecture is demonstrated that uses the E2ENP and allows multimedia applications to reconfigure themselves in realtime to match the specific network conditions in order to preserve the user-perceived QoS. Thus, an integration of application layer QoS as defined by the user and network layer QoS is achieved.

关键词： Multimedia communication Ad hoc networks Wireless communication XML Resource management Multicast protocols Mobile ad hoc networks Routing protocols Multicast communication IP networks

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How to Collect Balls Moving in the Euclidean Plane

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Electronic Notes in Theoretical computer science 2004年 91卷 229-245页

作者： Yuichi Asahiro Takashi Horiyama Kazuhisa Makino Hirotaka Ono Toshinori Sakuma Masafumi Yamashita Department of Social Information Systems Faculty of Information Science Kyushu Sangyo University Fukuoka 813-8503 Japan Depatment of Communications and Computer Engineering Graduate School of Informatics Kyoto University Kyoto 606-8501 Japan Division of Systems Science Graduate School of Engineering Science Osaka University Toyonaka Osaka 560-8531 Japan Department of Computer Science and Communication Engineering Graduate School of Information Science and Electrical Engineering Kyushu University Fukuoka 812-8581 Japan

In this paper, we study how to collect n balls moving with constant velocities in the Euclidean plane by k robots moving on straight track-lines through the origin. Since all the balls might not be caught by robots, differently from Moving-Target TSP, we consider the following 3 problems in various situations: (i) deciding if k robots can collect all n balls, (ii) maximizing the number of the balls collected by k robots, and (iii) minimizing the number of the robots to collect all n balls. The situations considered here contain the cases in which track-lines are given (or not), and track-lines are identical (or not). For all problems and situations, we provide polynomial time algorithms or proofs of intractability, which clarify the tractability-intractability frontier in the ball collecting problems in the Euclidean plane.

关键词： Moving-Target TSP Vehicle routing problem Partially ordered set Combinatorial optimization

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A class-based dynamic bandwidth allocation scheme for EPONs

A class-based dynamic bandwidth allocation scheme for EPONs

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International Conference on communication systems

作者： Jing Xie Shengming Jiang Yuming Jiang Institute For Infocomm Research Singapore Department of Electrical and Computer Engineering National University of Singapore Singapore Centre For Quantifiable quality of Service In Communication Systems Norwegian University of Science and Technology Norway

In an Ethernet passive optical network (EPON), all optical network units (ONUs) share one uplink channel to transmit multiple traffic. To avoid data collision, a contention-free MAC protocol is needed to schedule the transmission order of different ONUs. An available solution is to assign a variable-sized time slot to each ONU. In this paper, we first review some existing bandwidth allocation schemes for EPON in the literature. Then we propose a novel scheme called dynamic weight priority scheduling (DWPS), which not only guarantees all the ONUs that fairly share the bandwidth of uplink channel on demand, but also supports differentiated services. To prevent one service class from monopolizing the bandwidth under heavy load, a bandwidth threshold determined by a weight ensures a minimum bandwidth for each traffic class

关键词： Channel allocation EPON Optical network units Bandwidth Optical fiber networks Passive optical networks Telecommunication traffic Protocols Traffic control Force control

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Optimal code assignment and call admission control for OVSF-CDMA systems constrained by blocking probabilities

Optimal code assignment and call admission control for OVSF-...

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IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： Jun-Seong Park Lei Huang D.C. Lee C.-C.J. Kuo Department of Electrical Engineering Integrated Media Systems Center and Communication Sciences Institute University of Southern California Los Angeles CA USA Department of Electrical Engineering Integrated Media Systems Center and Communication Sciences Institute Los Angeles CA USA Department of Electrical Engineering and Computer Science Loyola Marymount University Los Angeles CA USA

The tradeoff between the throughput and the blocking probability of various code assignment schemes for OVSF-CDMA (orthogonal variable spreading factor CDMA) systems is investigated, and the optimal fixed and dynamic code assignment schemes that maximize the average data throughput under a blocking probability constraint are proposed. The optimal schemes are obtained using constrained optimization through the Markov decision process and linear programming. The performance of each scheme is numerically evaluated. Numerical results demonstrate that the proposed new schemes can achieve a satisfactory balance between the average throughput and the blocking probability.

关键词： Call admission control Throughput Measurement Constraint optimization Circuits Linear programming Wideband Multiaccess communication Multimedia systems communication channels

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Affinity-based similarity measure for Web document clustering

Affinity-based similarity measure for Web document clusterin...

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IEEE International Conference on Information Reuse and Integration (IRI)

作者： M.-L. Shyu S.-C. Chen M. Chen S.H. Rubin Department of Electrical and Computer Engineering University of Miami Coral Gables FL USA Distributed Multimedia Information System Laboratory School of Computer Science Florida International University Miami FL USA Center SSC San Diego SPA WAR Systems Center San Diego CA USA

Compared to the regular documents, the major distinguishing characteristics of the Web documents are the dynamic hyper-structure. Thus, in addition to terms or keywords for regular document clustering, Web document clustering can incorporate some dynamic information such as the hyperlinks and the access patterns extracted from the user query logs. In this paper, we extend the concept of document clustering into Web document clustering by introducing the strategy of affinity-based similarity measure, which utilizes the user access patterns in determining the similarities among Web documents via a probabilistic model. Several comparison experiments are conducted using a real data set and the experimental results demonstrate that the proposed similarity measure outperforms the cosine coefficient and the Euclidean distance method under different document clustering algorithms.

关键词： Clustering algorithms World Wide Web Uniform resource locators Particle measurements Multimedia systems distributed computing Military computing systems engineering and theory Information systems Laboratories

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A new partitioning algorithm for considering paging load distribution in mobile communication systems

A new partitioning algorithm for considering paging load dis...

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IEEE Conference on Vehicular Technology (VTC)

作者： Dong-Jun Lee HyeJeong Lee Dong-Ho Cho Mobile Development Team Telecommunication Systems Division Information & Communication Business Samsung Electronics Company Limited South Korea Division of Electrical Engineering Department of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology South Korea

ISBN: (纸本)0780382552

When the cells in a location area are paged sequentially, based on specific information, such as last registered area or mobile speed, the paging load may be non-uniformly distributed among the cells. This non-uniform paging traffic causes additional paging delay due to the increasing waiting time in cells that have a high paging load. We introduce a new partitioning strategy in which the paging sequence in a location area is optimized according to both the location probability of a mobile terminal and the paging load distribution among the cells. Numerical results show that our proposed strategy performs almost equivalently to the optimal one and outperforms the conventional paging scheme with respect to paging delay.

关键词： Partitioning algorithms Mobile communication Paging strategies Probability distribution Quality of service Mobile computing Business communication computer science Added delay Delay effects

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Video-based tracking of user's motion for augmented desk interface

Video-based tracking of user's motion for augmented desk int...

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International Conference on Automatic Face and Gesture Recognition

作者： Y. Sato K. Oka H. Koike Y. Nakanishi Institute of Industrial Science University of Tokyo Meguro Tokyo Japan Graduate School of Information Systems University of Electro-Communications Chofu Tokyo Japan Department of Computer Information and Communication Science Tokyo University of Agriculture슠and슠Technology Koganei Tokyo Japan

This paper presents an overview of our project on an augmented desk interface system called the EnhancedDesk. The EnhancedDesk is equipped with an infrared camera for tracking a users' hand motions, a color video camera for recognizing objects, and projectors for displaying various kinds of digital information onto the desk. The key technical innovations of the EnhancedDesk include: fast and accurate tracking of multiple fingers for direct manipulation of both real and projected objects with bare hands, interactive object registration and recognition with hand gestures, vision-based tracking of a user's gaze, and addition of interactive functionality overlaid on the desk. This paper presents a brief description of the components, as well as some prototypes of applications of our augmented desk interface system.

关键词： Tracking Graphical user interfaces computer simulation computer interfaces Digital cameras computer applications Application software Multimedia systems Computational modeling communication industry

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Cooperative embodied communication emerged by interactive humanoid robots

Cooperative embodied communication emerged by interactive hu...

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IEEE International Workshop on Robot and Human communication (ROMAN)

作者： D. Sakamoto T. Kanda T. Ono M. Kamashima M. Imai H. Ishiguro ATR Intelligent Robotics and Communication Laboratories Soraku-gun Kyoto Japan Department of Media Architecture Future University-Hakodate Hakodate Hokkaido Japan Department of Computer Science Graduate School of Science and Technology Keio University Yokohama Kanagawa Japan Department Adaptive Machine Systems Graduate School of Engineering Osaka University Osaka Japan

Research on humanoid robots has produced various uses for their body properties in communication. In particular, mutual relationships of body movements between a robot and a human are considered to be important for smooth and natural communication, as they are in human-human communication. We have developed a semi-autonomous humanoid robot system that is capable of cooperative body movements with humans using environment-based sensors and switching communicative units. And we conducted an experiment using this robot system and verified the importance of cooperative behaviors in a route-guidance situation where a human gives directions to the robot. This result indicates that the cooperative body movements greatly enhance the emotional impressions of human in a route-guidance situation. We believe these results allow us to develop interactive humanoid robots that sociably communicate with humans.

关键词： Humanoid robots Robot sensing systems Intelligent robots Human robot interaction Laboratories Sensor systems communication switching computer science Adaptive systems Educational institutions

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Preface

Lecture Notes in Computer Science (including subseries Lectu...

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Lecture Notes in computer science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2004年 3093卷 V-VI页

作者： Katsikas, Sokratis K. Gritzalis, Stefanos Lopez, Javier University of the Aegean Rector's Office Administration Building University Hill Mytilene Greece University of the Aegean Department of Information and Communication Systems Engineering Laboratory of Information and Communication Systems Security Karlovassi Samos Greece University of Malaga Computer Science Department E.T.S. Ingeniería Informática Campus de Teatinos Spain

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