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Delay Modeling and Analysis of IEEE 802.11 DCF with Selfish Nodes

Delay Modeling and Analysis of IEEE 802.11 DCF with Selfish ...

The 4th International Conference on Wireless Communications, Networking and Mobile Computing(第四届IEEE无线通信、网络技术及移动计算国际会议)

作者： Mingyuan Li Chunfeng Liu Yantai Shu Oliver W.W.Yang Department of Computer Science Tianjin University Tianjin 300072 China School of Information Technology and Engineering University of Ottawa Ottawa Ontario Canada K1N6N

Research on selfish nodes in wireless ad hoc networks has received considerable attention recently. However, most work concentrates on throughput study of the effects of selfish nodes, but lacks an analytical study to accurately predict the delay. With the rising popularity of delay-sensitive real-time multimedia applications (video, voice and data) in wireless ad hoc networks, it is becoming important to study the MAC delay performance of ad hoc networks in the presence of selfish nodes. In this paper, based on a two-dimensional Markov chain model, we analyze the medium access delay with selfish nodes. The proposed analysis applies both the basic access and the RTS/CTS access mechanisms. Through extensive simulations, the analytical model and delay results of selfish nodes and well-behavior nodes are validated using IEEE 802.11 DCF protocol.

关键词： delay modeling selfish node ad hoc networks

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Complex query processing on Web graph: A social network perspective

Complex query processing on Web graph: A social network pers...

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作者： Mitra, Susanta Bagchi, Aditya Bandyopadhyay, Anup Kumar International Institute of Information Technology X - 1/8/3 Block EP Salt Lake Electronics Complex Kolkata 700091 India Computer and Statistical Service Centre Indian Statistical Institute 203 B.T. Road Kolkata 700108 India Electronics and Telecommunication Engineering Department Jadavpur University Kolkata 700032 India

A social network represents a social community as a directed graph. Communication on the Web has given rise to social network formation like, Web Community, Referral System etc. An earlier effort has proposed a data model for such Web-based social network. Present paper discusses the relevant index structures for processing queries on a social network schema based upon the proposed data model. The paper has also provided evaluation of the structural operators proposed in the data model and discussed their efficacy with query examples.

关键词： Query processing

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Spin transverse separation in a two-dimensional electron-gas using an external magnetic field with a topological chirality

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Physical Review B 2008年第24期78卷 245321-245321页

作者： S. G. Tan M. B. A. Jalil Xiong-Jun Liu T. Fujita Data Storage Institute Agency for Science Technology and Research (A*STAR) DSI Building 5 Engineering Drive 1 Singapore 117608 Singapore Department of Electrical and Computer Engineering Information Storage Materials Laboratory National University of Singapore 4 Engineering Drive 3 Singapore 117576 Singapore Department of Physics National University of Singapore 2 Science Drive 3 Singapore 117542 Singapore

We propose a two-dimensional electron-gas (2DEG) system in which an external magnetic field with a small chirality is applied to provide a topological spin gauge field that separates conduction electrons of opposite spins in the transverse direction. Additionally, the vertical electric field in the 2DEG, together with spin-orbit coupling, produces a SU(2) gauge field which reinforces or opposes the effect of the spin gauge. The system thus provides a tunable spin separation effect, where an applied gate voltage on the 2DEG can be used to modulate the transverse spin current. As this method leads to the enhancement or cancellation of spin separation due to the intrinsic spin-orbit coupling effect only, it may naturally distinguish the extrinsic effect from the intrinsic one.

关键词： spin-orbit interactions two-dimensional electron gas

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Wireless estimation of canine pose for search and rescue

2008 IEEE International Conference on System of Systems Engi...

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2008 IEEE International Conference on System of Systems engineering, SoSE 2008 2008年

作者： Ribeiro, Cristina Ferworn, Alexander Denko, Mieso Tran, James Mawson, Chris Department of Computing and Information Science University of Guelph 50 Stone Road Guelph ON N1G 2Wl Canada Department of Computer Science Ryerson University 350 Victoria Street Toronto ON M5B 2K3 Canada School of Engineering and Information Technology Deakin University Pigdons Road Geelong VIC Australia

ISBN: (纸本)9781424421732

In this paper we discuss the use of accelerometers and Bluetooth to monitor canine pose in the context of common poses observed in Urban Search and Rescue dogs. We discuss the use of the Canine Pose System in a disaster environment, and propose techniques for determining canine pose. In addition we discuss the challenges with this approach in such environments. The paper presents the experimental results obtained from the Heavy Urban Search and Rescue disaster simulation, where experiments were conducted using multiple canines, which show that angles can be derived from acceleration readings. Our experiments show that similar angles were measured for each of the poses, even when measured on multiple USAR canines of varying size. We also found measurable and consistent differences between each of the poses, making them clearly distinguishable from one another, again even when comparing with different USAR canines. © 2008 IEEE.

关键词： Bluetooth

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OPTIMIZATION OF PLASTIC INJECTION MOLDING PROCESS VIA TAGUCHI'S PARAMETER DESIGN METHOD, BPNN, AND DFP

OPTIMIZATION OF PLASTIC INJECTION MOLDING PROCESS VIA TAGUCH...

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2008 International Conference on Machine Learning and Cybernetics(2008机器学习与控制论国际会议)

作者： W.C.CHEN M.W.WANG G.L.FU C.T.CHEN Graduate School of Industrial Engineering and System Management Chung Hua University No.707 Sec.2 Department of Mechanical Engineering National Kaohsiung University of Aapplied Sciences415 Chien Ku Graduate Institute of Technology Management Chung Hua University No.707 Sec.2 Wu Fu Rd. Hsinchu Department of Computer Science and Information Engineering Ta Hwa Institute of Technology 1 Tahwa

This research integrates Taguchi's parameter design method, back-propagation neural networks (BPNN), and Davidon-Fletcher-Powell (DFP) method to optimize the process parameter settings of plastic injection molding. Taguchi's parameter design method is used to arrange an orthogonal array experiment and to reduce the number of set-test cycles. Injection Time, Velocity Pressure Switch Position, Packing Pressure, and Injection Velocity are selected as process control parameters and product weight is selected as the single product quality. The experimental data of Taguchi's parameter design method are used for effectively training and testing BPNN. Then, BPNN is combined with DFP to search out the final optimal process parameter settings. Finally, a confirmation experiment is performed to confirm the effectiveness of the final optimal process parameter settings. The experimental results show that the proposed effective process parameter optimization approach can avoid shortcomings inherent in the application of trial-and-error processes or the conventional Taguchi parameter design method. Furthermore, the proposed approach can effectively assist engineers in determining optimal initial process parameter settings and achieving competitive advantages on product quality and costs.

关键词： Plastic injection molding Back-propagation neural networks Taguchi's parameter design Davidon-Fletcher-Powell method

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Lecture Notes in computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics): 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) 2008年 5139 LNAI卷 V-VI页

作者： Tang, Changjie Ling, Charles X. Zhou, Xiaofang Li, Xue Cercone, Nick J. Sichuan University Computer School Chengdu 610065 China University OfWestern Ontario Department of Computer Science ON N6A 5B7 Canada University of Queensland School of Information Technology and Electrical Engineering Brisbane QLD 4072 Queensland Australia York University Faculty of Science and Engineering Toronto ON M3J 1P3 Canada

No abstract available

ISBN: (纸本)3540881913

No abstract available

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A Cluster Head Decision System for Sensor Networks Using Fuzzy Logic and Number of Neighbor Nodes

A Cluster Head Decision System for Sensor Networks Using Fuz...

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2008 the First IEEE International Conference on Ubi-Media Computing and Workshops(U-Media2008)

作者： Junpei Anno Leonard Barolli Arjan Durresi Fatos Xhafa Akio Koyama Graduate School of Engineering Fukuoka Institute of Technology (FIT) 3-30-1 Wajiro-Higashi Higashi-Ku Fukuoka 811-0295 Japan Department of Information and Communication Engineering Fukuoka Institute of Technology (FIT) 3-30-1 Wajiro-Higashi Higashi-Ku Fukuoka 811-0295 Japan Department of Computer and Information Science Indiana University Purdue University Indianapolis 723 W. Michigan Street SL 280 Indianapolis IN 46202 USA Department of Languages and Informatics Systems Polytechnic University of Catalonia Jordi Girona 1-3 08034 Barcelona Spain Department of Informatics Yamagata University 4-3-16 Jonan Yonezawa 992-8510 Yamagata Japan

Cluster formation and cluster head selection are important problems in sensor network applications and can drastically affect the network’s communication energy dissipation. However, the selection of cluster head is not easy in different environments which may have different characteristics. In this paper, in order to deal with this problem we propose a power reduction algorithm for sensor networks based on fuzzy logic and number of neighbor nodes. We evaluate the proposed system by simulations and show that proposed system makes a good selection of the cluster head.

关键词： Cluster A Cluster Head Decision System for Sensor Networks Using Fuzzy Logic and Number of Neighbor Nodes Sensor Fuzzy

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GUEST EDITORS' INTRODUCTION

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International Journal of Cooperative information Systems 2008年第3期17卷 257-258页

作者： SCHAHRAM DUSTDAR BERND KRÄMER PRIYA NARASIMHAN Vienna University of Technology Austria Distributed Systems Group (DSG) Information Systems Institute A-1040 Wien Argentinierstrasse 8/184-1 Austria FernUniversität in Hagen Philipp-Reis-Gebäude D-58084 Hagen Germany Carnegie Mellon University Electrical and Computer Engineering Department Carnegie Mellon University 5000 Forbes Avenue Pittsburgh PA 15213-3890 USA

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Muon components detected by EAS array and Okayama muon telescope experiments

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Nuclear Physics B - Proceedings Supplements 2008年 175-176卷 366-369页

作者： A. Iyono C. Noda H. Matsumoto M. Masuda M. Okita K. Okei T. Morita N. Takahashi N. Ochi T. Konishi T. Nakatsuka S. Ohara S. Tsuji T. Wada I. Yamamoto Y. Yamashita T. Nakamura K. Saitoh Department of Fundamental Science Okayama University of Science 1-1 Ridai-cho Okayama Okayama 700-0005 Japan Graduate School of Infomatics Okayama University of Science 1-1 Ridai-cho Okayama Okayama 700-0005 Japan Department of Physics Okayama University Okayama 700-8530 Japan Dept. of Advanced Physics Hirosaki University Hirosaki Aomori 036-8561 Japan Yonago National College of Technology Yonago Tottori 683-8502 Japan Kinki University Higashi-Osaka Osaka 577-8502 Japan Okayama Shoka University Okayama 700-8601 Japan Nara Industrial University Ikomagun Nara 636-0821 Japan Kawasaki Medical School Kurashiki Okayama 701-0192 Japan Department of Information and Computer Engineering 1-1 Ridai-cho Okayama Okayama 700-0005 Japan Kochi University Kochi Kochi 780-8520 Japan Ashikaga Institute of Technology Ashikaga Tochigi 326-8558 Japan

The Okayama muon telescope and the extensive air shower (EAS) array in Large Area Air Shower (LAAS) experiments were used to measure both muon and electron components in EAS events. The average ratio of the number of muon tracks to electron tracks 0.01 ± 0.005 was derived from this analysis, which is consistent with the typical core distance of EAS from the telescope in PeV energies derived from EAS simulation results.

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The anisotropy of cosmic ray flux in Large Area Air Shower experiments

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Nuclear Physics B - Proceedings Supplements 2008年 175-176卷 459-462页

作者： C. Noda A. Iyono H. Matsumoto M. Masuda M. Okita K. Okei T. Morita N. Takahashi N. Ochi T. Konishi T. Nakatsuka S. Ohara S. Tsuji T. Wada I. Yamamoto Y. Yamashita T. Nakamura K. Saitoh Graduate School of Infomatics Okayama University of Science 1-1 Ridai-cho Okayama Okayama 700-0005 Japan Department of Fundamental Science Okayama University of Science 1-1 Ridai-cho Okayama Okayama 700-0005 Japan Department of Physics Okayama University Okayama 700-8530 Japan Dept. of Advanced Physics Hirosaki University Hirosaki Aomori 036-8561 Japan Yonago National College of Technology Yonago Tottori 683-8502 Japan Kinki University Higashi-Osaka Osaka 577-8502 Japan Okayama Shoka University Okayama 700-8601 Japan Nara Industrial University Ikomagun Nara 636-0821 Japan Kawasaki Medical School Kurashiki Okayama 701-0192 Japan Department of Information and Computer Engineering 1-1 Ridai-cho Okayama Okayama 700-0005 Japan Kochi University Kochi Kochi 780-8520 Japan Ashikaga Institute of Technology Ashikaga Tochigi 326-8558 Japan

The sidereal anisotropy of cosmic rays with energy in the range of 10 14 – 10 15 eV was obtained by using Large Area Air Show (LAAS) experiments which deployed extensive air shower (EAS) arrays in large part of Japan. The first harmonic amplitude and phase in a function of right ascension axis are ( 0.23 ± 0.04 ) × 10 −2 and 0.4 ± 0.7 hour, respectively, and those of the second harmonics are ( 0.06 ± 0.04 ) × 10 −2 and 7.5 ± 2.6 hour, respectively. The first harmonic amplitude are compared with the diffusive mode of cosmic ray propagation, which predicts the dependence of anisotropy amplitudes on primary cosmic ray rigidities. The exponent value of rigidity dependence of diffusion coefficient is estimated as 0.34 ± 0.01 , in good agreement with Kolmogorov type spectrum of turbulence of galactic magnetic filed. Although a sky map in equatorial coordinates indicates excess and deficit regions above the isotropic expectation, their deviations were consistent with statistical ones, and more statistics are required to point the region and the opening angle of them.

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