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12th International Conference on Human-computer Interaction with Mobile Devices and Services, Mobile HCI2010

作者： Aslan, Ilhan Leichtenstern, Karin Holleis, Paul Wasinger, Rainer Stahl, Christoph Fraunhofer Institute for Communication Systems Hansastraße 32 80686 München Germany Augsburg University Universitätsstr. 6a 86135 Augsburg Germany DOCOMO Euro Labs. Munich Landsberger Str. 312 80687 Munich Germany School of Information Technologies University of Sydney Building J12 NSW 2006 Australia Dept. of Computer Science Saarland University P.O. Box 151150 66041 Saarbrücken Germany

ISBN: (纸本)9781605588353

We are interested in all sorts of tool-support, which help the designer of a pervasive application in different stages of the development process, such as task and requirements analysis, conceptual design, prototyping and evaluation. We are looking for contributions that will help to address the following questions: • What are the past experiences and future expectations of designers and developers that use tools for support? • What exactly are the benefits and the shortcomings of available tools? • What are the open issues and challenges for the next few years? The workshop will feature presentations of research results, experiences of past and ongoing work, and a forum for participants to address a predefined set of focus questions.

关键词： Conceptual design

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Introduction to model-based reliability evaluation of wireless sensor networks

Introduction to model-based reliability evaluation of wirele...

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作者： Jäggle, C. Neidig, J. Grosch, T. Dressler, F. Siemens AG Industry Sector Nuremberg Germany Computer Networks and Communication Systems Dept. of Computer Science University of Erlangen Germany

ISBN: (纸本)9783902661449

A high level of reliability is a significant requirement for using wireless sensor networks in industrial environments. Model-based evaluation is usually applied in conventional systems to estimate the reliability. In contrast, for analyzing sensor networks, these methods are hardly tested and proven due to the unique properties of that kind of network. This paper presents a first model-based approach to quantitatively assess the reliability of sensor networks. Based on an abstract model of a sensor network, the degree of detail with respect to the characteristic aspects of sensor networks is increased in a stepwise manner. If network topologies are taken into account, analytical methods fail and the assessment of reliability measures has to be done numerically. Finally, a Monte Carlo Simulation is conducted to also cover dynamics in the topology. In conclusion, this paper shows that, by knowledge of link probabilities and lifetime distributions of single sensor nodes, model-based analysis may be used to estimate reliability measures of sensor networks. © 2009 IFAC.

关键词： Monte Carlo methods

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Improving IEEE 802.15.4 for low-latency energy-efficient industrial applications

Improving IEEE 802.15.4 for low-latency energy-efficient ind...

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Workshop on Aktuelle Anwendungen in Technik und Wirtschaft, 2008

作者： Chen, Feng Computer Networks and Communication Systems Dept. of Computer Sciences University of Erlangen-Nuremberg Erlangen91058 Germany

ISBN: (纸本)9783662580950

The IEEE 802.15.4 standard for LR-WPAXs is becoming a de-facto standard for Wireless Sensor Xetworks (WSXs) applications in industrial fields. In this paper, we evaluate the latency performance of the IEEE 802.15.4 protocol based on a typical industrial scenario: a star network with 20 devices that send short messages (1 Byte) to the PAX coordinator. We analyzed the behavior of the GTS mechanism in the standard analytically. The results reveal essential limitations of the standard for low-latency applications in automation environments. According to our findings, we propose an enhanced protocol version that fully supports industry demands on low-latency communication. Our protocol version uses the original physical layer and, thus, can be implemented conveniently using cheap IEEE 802.15.4 hardware. The analytical results prove that we are able to meet the guaranteed low latency of 10 ms as specified by typical automation environments. © Springer-Verlag Berlin Heidelberg 2009.

关键词： Network layers

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Introduction to Model-based Reliability Evaluation of Wireless Sensor networks

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IFAC Proceedings Volumes 2009年第5期42卷 134-139页

作者： C. Jäggle J. Neidig T. Grosch F. Dressler Siemens AG Industry Sector Nuremberg Germany Computer Networks and Communication Systems Dept. of Computer Science University of Erlangen Germany

关键词： Network reliability Sensor networks Stochastic modeling Monte Carlo Simulation

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An automatic warping points extraction method for calibration of wide angle camera

An automatic warping points extraction method for calibratio...

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2009 International Conference on Image Processing, computer Vision, and Pattern Recognition, IPCV 2009

作者： Kim, Dae-Hyeon Kim, Byung-Ik Ha, Su-Young Shim, Tae-Eun Kim, Young-Choon Sohng, Kyu-Ik School of Electrical Engineering and Computer Science Kyungpook National University Korea Republic of Division of IT Cooperative Systems Gyeongbuk Provincial College Korea Republic of Dept. of Information and Communication Engineering Youngdong University Korea Republic of

ISBN: (纸本)9781601321190

Radial or pincushion distortion problem of the wide angle charge-coupled device (CCD) camera is an important issue in the image calibration in case of close-up photography of real scene. We designed the auto-extraction method of the warping points in the calibration algorithm of the image acquired by the wide angle CCD camera. Proposed method extracts the distortion point by the wide angle CCD camera, using the threshold value of the histogram of the horizontal and vertical pixel lines. This processing step can be directly applied to the original image of the wide angle CCD camera output. Proposed method results are compared with hand-worked result image using the two wide angle CCD cameras having different angles (90° and 120°) with the difference value of the result images respectively. Experimental results show that proposed method can allocate the distortion-calibration constant of the wide angle CCD camera regardless of lens type, distortion shape and image type.

关键词： CCD cameras

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Autonomously normalized horizontal differentials as features for HMM-based omni font-written OCR systems for cursively scripted languages

Autonomously normalized horizontal differentials as features...

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2009 IEEE International Conference on Signal and Image Processing Applications, ICSIPA09

作者： Attia, Mohamed Rashwan, Mohsen A.A. El-Mahallawy, Mohamed S.M. Engineering Company for the Development of Computer Systems RDI Egypt Dept. of Electronics and Electrical Communication Faculty of Eng. Cairo Univ. Egypt Arab Academy for Science and Technology and Maritime Transport AAST-MT Egypt

ISBN: (纸本)9781424455614

Automatic font-written Optical Character Recognition (OCR) is highly desirable for numerous modern information technology (IT) applications. Reliable font-written OCR's for Latin scripts are readily in use since long. For cursively scripted languages, that are the mother tongues of over one fourth of the world population, such OCR's are however not available at a robust and reliable performance. In this regard, the main challenge is the mandatory connectivity of characters/ligatures (i.e. graphemes) that has to be resolved simultaneously upon the recognition of these graphemes. Among the various approaches tried over decades, Hidden Markov Models (HMM)-based OCR's seem to be the most promising as they capitalize on the ability of HMM decoders to achieve segmentation and recognition simultaneously similar to the widely used HMM-based automatic speech recognition (ASR). Unlike ASR's, what is missing in HMM-based OCR's is the definition of a rigorously founded features vector capable to robustly achieving minimal "font type/size-independent" (omnifont) word error rates comparable to those realized with Latin scripts. Here comes the contribution of this paper that introduces such a sound features vector design, and experimentally shows its superiority in this regard.

关键词： Optical character recognition

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Deaf, Dumb, and Chatting Asynchronous Robots Enabling Distributed Computation and Fault-Tolerance among Stigmergic Robots

Deaf, Dumb, and Chatting Asynchronous Robots Enabling Distri...

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13th International Conference on Principles of Distributed systems

作者： Dieudonne, Yoann Dolev, Shlomi Petit, Franck Segal, Michael MIS Université of Picardie Jules Verne France Department of Computer Science Ben-Gurion University of the Negev Israel LiP6/CNRS/INRIA-REGAL Université Pierre et Marie Curie - Paris 6 France Communication Systems Engineering Dept. Ben-Gurion University of the Negev Israel

ISBN: (纸本)9783642108761

We investigate avenues for the exchange of information (explicit communication) among deaf and dumb mobile robots scattered in the plane. We introduce the use of movement-signals (analogously to flight signals and bees waggle) as a mean to transfer messages, enabling the use of distributed algorithms among robots. We propose one-to-one deterministic movement protocols that implement explicit communication among asynchronous robots. We first show how the movements of robots can provide implicit acknowledgment in asynchronous systems. We use this result to design one-to-one communication among a pair of robots. Then, we propose two one-to-one communication protocols for any system of n >= 2 robots. The former works for robots equipped with observable IDs that agree on a common direction (sense of direction). The latter enables one-to-one communication assuming robots devoid of any observable IDs or sense of direction. All three protocols (for either two or any number of robots) assume that no robot remains inactive forever. However, they cannot avoid that the robots move either away or closer of each others, by the way requiring robots with an infinite visibility. In this paper, we also present how to overcome these two disadvantages. These protocols enable the use of distributing algorithms based on message exchanges among swarms of Stigmergic robots. They also allow robots to be equipped with the means of communication to tolerate faults in their communication devices.

关键词： Explicit communication Mobile Robot networks Stigmergy

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Enhancing cooperative behavior for online reputation systems by group selection

Enhancing cooperative behavior for online reputation systems...

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Symposia and Workshops on Ubiquitous, Autonomic and Trusted Computing in Conjunction with the UIC'09 and ATC'09 Conferences, UIC-ATC 2009

作者： Ren, Yizhi Li, Mingchu Cui, Yongrui Guo, Cheng Sakurai, Kouichi School of Software Dalian University of Technology Dalian 116621 China Dept. of Computer Science and Communication Engineering Kyushu University Hakozaki Fukuoka 812-81 Japan Institute of Systems Information Technologies KYUSHU 2-1-22 Momochihama Sawara-ku Fukuoka 814-0001 Japan

ISBN: (纸本)9780769537375

Reputation systems are very useful in large online communities in which users may frequently have the opportunity to interact with users with whom they have no prior experience. Recently, how to enhance the cooperative behaviors in the reputation system that has became to one of the key open issues. Research in the evolutionary game theory shows that the group selection or multilevel selection can favor the cooperation in the finite populations. Furthermore, Nowak et al., in [1], [2] give a fundamental condition for the evolution of cooperation by group *** on the above important result, we extend the group selection concept in evolutionary biology and propose a group-based mechanism to enhance cooperation for online reputation systems. © 2009 IEEE.

关键词： Game theory

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Distributed and Optimal Reduced Primal-Dual Algorithm for Uplink OFDM Resource Allocation

Distributed and Optimal Reduced Primal-Dual Algorithm for Up...

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Joint 48th IEEE Conference on Decision and Control and 28th Chinese Control Conference

作者： Xiaoxin Zhang Liang Chen Jianwei Huang Minghua Chen Yuping Zhao the State Key Laboratory of Advanced Optical Communication Systems & Networks School of Electronics Engineering and Computer SciencePeking University the Dept.of Information Engineering Chinese University of Hong Kong

Orthogonal frequency division multiplexing(OFDM) is the key component of many emerging broadband wireless access *** resource allocation in OFDM uplink,however,is challenging due to heterogeneity of users' quality of service requirements,channel conditions,and individual resource *** formulate the resource allocation problem as a non-strictly convex optimization problem,which typically has multiple global optimal *** propose a reduced primal-dual algorithm,which is distributed,requires simple local updates,and probably globally converges to a global optimal solution under easily satisfied sufficient technical *** performance of the algorithm is studied through a realistic OFDM simulator based on field *** with the previously proposed standard primal-dual algorithm,the reduced algorithm decreases the total number of iterations by 80%and the variance by 85%.

关键词： RPD Distributed and Optimal Reduced Primal-Dual Algorithm for Uplink OFDM Resource Allocation

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Simulating the influence of IVC on road traffic using bidirectionally coupled simulators

Simulating the influence of IVC on road traffic using bidire...

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2008 IEEE INFOCOM Workshops

作者： Sommer, Christoph Yao, Zheng German, Reinhard Dressler, Falko Computer Networks and Communication Systems Dept. of Computer Sciences University of Erlangen-Nuremberg Germany

ISBN: (纸本)9781424422197

We discuss the need for bidirectional coupling of network simulation and road traffic microsimulation for evaluating Vehicular Ad Hoc networks (VANETs) in a simulation framework. As the selection of a mobility model influences the outcome of simulations to a great deal, the use of a representative model is necessary for producing meaningful evaluation results. Based on these observations, we present a hybrid simulation framework composed of the road traffic simulator SUMO and the network simulator OMNeT++. The coupled simulation environment is used for an evaluation of two protocols for incident warning in VANETs. ©2008 IEEE.

关键词： Vehicular ad hoc networks

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