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11th International Conference on Information Technology

作者： Roychoudhury, Sanjukta Dutta, Paramartha Maiti, Biswajit Junior Research Fellow Department of Computer Science and Engineering Kalyani Govt. Engineering College Nadia West Bengal PIN-741235 India Department of Computer and System Sciences Visva-Bharati University Santiniketan PIN-731235 West Bengal India Department of Physics Kalyani Govt. Engineering College Nadia PIN-741235 West Bengal India

ISBN: (纸本)9780769535135

In this article, we have concentrated on selecting the reliable path from source to destination in a mobile ad-hoc network (MANET) framework using Dempster-Shafer Theory (DST) of evidence. The belief and plausibility functions are used here for calculating the suitable path for sending data packet from source to destination selecting the proper neighborhood oil the basis of radio range of the source node. The radio range is determined depending on the Proximity Index and birth rate and death rate of the neighborhood nodes of the source node. Whenever data packet is changing hops within source and destination some credit and penalty are introduced to the next and previous hops respectively. In the concluding section of the present article a measure of gain (in delay) has been introduced for comparison of the existing methods vis-a-vis that of the proposed one.

关键词： Mobile ad hoc networks

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BD-LZW picture compression algorithm for WSN system

BD-LZW picture compression algorithm for WSN system

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2008 3rd International Conference on Pervasive Computing and Applications, ICPCA08

作者： Jinlan, Zhan Qingguo, Zhou Shuwei, Bai Li, Cuihual Bin, Hu Li, Lian Department of Computer Science Video and Image Processing Lab Xiamen University China Engineering Research Center of Open Source Software and Real-time System Ministry of Education Department of Information Science and Engineering Lanzhou University China Department of Computing University of Central England United Kingdom

ISBN: (纸本)9781424420209

In the paper, a new parallel LZW-Like algorithm, bidirectory LZW algorithm (BD-LZW) will be interpreted The new algorithm can be used in data compression/decompression system which runs on multi-microprocessor system, such as CELL, which the algorithm will be implemented on. Different from the conventional parallel LZW algorithm with one input directory, BD-LZW algorithm allows two threads reading characters from two ends of string. By this method, the data can be partitioned for compression/decompression loading between two threads fairly and easily. The most important is the compression performance can be improved by the new algorithm. Comparing running time, it's lower 10% than conventional parallel LZW (P-LZW) algorithm when there are two threads running on CELL architecture. © 2008 IEEE.

关键词： Compression algorithms Wireless sensor networks Yarn Partitioning algorithms Image coding Data compression Video compression Image processing computer science Open source software

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Using Self Organizing Maps and nearest-neighbor to data clustering

Using Self Organizing Maps and nearest-neighbor to data clus...

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2008 International Conference on Artificial Intelligence, ICAI 2008 and 2008 International Conference on Machine Learning;Models, Technologies and Applications, MLMTA'08

作者： Boscarioli, Clodis Del Moral Hernandez, Emilio Da Silva, Leandro Augusto Department of Computer Science West Paraná State University Cascavel PR Brazil Department of Electronic System Engineering Polytechnic School University of Sao Paulo SP Brazil

ISBN: (纸本)9781601320728

The data analysis involves the performance of different tasks, which can be performed by many different techniques and strategies. This research emphasizes the performance of the Data Clustering task using the artificial neural network Self-Organizing Maps as the main artifact. SOM is an Artificial Neural Network based in a competitive unsupervised learning, what implies in the training being entirely guided by the data and the neurons of the map compete among themselves. This neural network has the ability to form mappings that quantify the data, preserving its topology. This work introduces a new methodology of data clustering since SOM, that considers the topological map generated by him and the data topology in the clustering process, once considers the neighborhood of the input data.

关键词： Self organizing maps

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Efficient multiple data sources selection algorithm in data-sharing environments

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Ruan Jian Xue Bao/Journal of Software 2008年第2期19卷 314-322页

作者： Wang, Xiao-Qing Zheng, Yan-Xing Shi, Mei-Lin Department of Computer Science and Technology Tsinghua University Beijing 100084 China Beijing Institute of System Engineering Beijing 100101 China

The problem of multiple data sources selection (MDSS) in DSE (data-sharing environments) is addressed and the algorithm MDSSA (MDSS algorithm) is presented. MDSSA introduces the concept of Pareto optimization which reduces the search space greatly. By means of a novel normal-measure based nonlinear cost function, MDSSA computes approximate Pareto optimal paths to each data source first, and then gives the optimal data source and its corresponding path by comparing the cost of all candidate paths, resulting in finding more effective paths and much shorter response time. Extensive simulations show the efficiency of the algorithm.

关键词： Data processing

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Energy efficient clustering protocol for surveillance sensor networks

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Ruan Jian Xue Bao/Journal of Software 2008年第9期19卷 2432-2441页

作者： Shen, Yang Qi, Wang-Dong Dai, Hao Department of Computer Engineering PLA University of Science and Technology Nanjing 210007 China Chinese Electronic Equipment and System Engineering Corporation Beijing 100039 China

This paper proposes a distributed energy efficient clustering protocol for target surveillance in sensor networks (EECTS). The protocol selects cluster heads according to a hybrid of node's residual energy and distribution of its neighbors. In addition, for the sake of reducing the energy dissipation of the cluster head, a minimum spanning tree with root of the base station is constructed among the cluster heads. Then it sends the gathered data to its upstream node along the spanning tree. The chief task of surveillance sensor networks is to sensing the moving target. So an intra-cluster node schedule method named EECTS-1 that can senses the most part of the network and it's enhanced method EECTS-2 are introduced. The two methods can obtain the high continuous surveillance degree when the moving target enters into the network. EECTS produces a linear network lifetime in the number of nodes and keeps good continuous surveillance degree simultaneously. The simulation results show that with the same performance of surveillance the EECTS-1 achieves the same lifetime as that HEED obtains and outperforms DEEG with up to 35% improvement. The EECTS-2 outperforms HEED significantly with prolonging the network lifetime about 70%-80%. Therefore the EECTS is suitable for military target surveillance and has high reliability of the sensing information.

关键词： Sensor networks

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Power management of variation aware chip multiprocessors 08

Power management of variation aware chip multiprocessors

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GLSVLSI 2008: 18th ACM Great Lakes Symposium on VLSI 2008

作者： Papa, Abu Saad Mutyam, Madhu Center for VLSI and Embedded System Technologies International Institute of Information Technology Hyderabad - 500032 India Department of Computer Science and Engineering Indian Institute of Technology Madras Chennai - 600036 India

ISBN: (纸本)9781595939999

Faced with the challenge of finding ways to use an evergrowing transistor budget, microarchitects have begun to move towards the chip multiprocessors (CMPs) as an attractive solution. CMPs have become a common way of reducing chip complexity and power consumption while maintaining high performance. Multiple cores are replicated on a single chip, resulting in a potential linear scaling of performance. Cores are becoming sufficiently small with technology scaling. As technology continues to scale, inter-die and intra-die variations in process parameters can result in significant impact on performance and power consumption, leading to asymmetry among the cores that were designed to be symmetric. Adaptive voltage scaling can be used to bring all cores to the same performance level leaving only core-to-core power variations. The goal of our work is to find the optimal frequency that balances performance with power against asymmetry. We also demonstrate that traditional task scheduling techniques need to be revisited to mitigate the effects of process variations. Copyright 2008 ACM.

关键词： Electric power utilization

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Several issues in operation of large-scale wind farms

Several issues in operation of large-scale wind farms

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2008 41st Annual Frontiers of Power Conference

作者： Jiang, John N. Tang, Choon Yik School of Electrical and Computer Engineering at the University of Oklahoma. Power system analysis power economics and energy finance. United States Oklahoma State University Stillwater electrical engineering from the University of Michigan Ann Arbor Department of Electrical Engineering and Computer Science at the University of Michigant United States

Past research and recent lessons learned suggest that large-scale wind farms not only have to operate in the maximum power tracking (MPT) mode to maximize capture of wind energy, they also have to be able to quickly respond to system reliability and economic conditions by operating in the power regulation (PR) mode. This paper discusses several newly identified, critical issues that need to be addressed for satisfactory operation of large-scale wind farms. We first present a nonlinear controller that enables seamless operation in both the MPT and PR modes-a feature not available in existing schemes-but suffers from limited robustness. We then present the result of an empirical study on the loss of power generation in wind farms and discuss its impact on wind farm operation. Finally, we propose a controller for potentially overcoming these issues and conclude with future research directions.

关键词： Wind turbines

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Block remap with turnoff: A variation-tolerant cache design technique

Block remap with turnoff: A variation-tolerant cache design ...

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2008 Asia and South Pacific Design Automation Conference, ASP-DAC

作者： Hussain, Mohammed Abid Mutyam, Madhu Center for VLSI and Embedded System Technologies International Institute of Information Technology - Hyderabad Hyderabad - 500032 India Department of Computer Science and Engineering Indian Institute of Technology Madras Chennai - 600036 India

ISBN: (纸本)9781424419227

With reducing feature size, the effects of process variations are becoming more and more predominant. Memory components such as on-chip caches are more susceptible to such variations because of high density and small sized transistors present in them. Process variations can result in high access latency and leakage energy dissipation. This may lead to a functionally correct chip being rejected, resulting in reduced chip yield. In this paper, by considering a process variation affected on-chip data cache, we first analyze performance loss due to worst-case design techniques such as accessing the entire cache with the worst-case access latency or turning off the process variation affected cache blocks, and show that the worst-case design techniques result in significant performance loss and/or high leakage energy. Then by exploiting the fact that not all applications require full associativity at set-level, we propose a variation-tolerant design technique, namely, block remap with turnoff (BRT), to minimize performance loss and leakage energy consumption. In BRT technique we selectively turnoff few blocks after rearranging them in such a way that all sets get almost equal number of process variation affected blocks. By turning off process variation affected blocks of a set, leakage energy can be minimized and the set can be accessed with low latency at the cost of reduced set associativity. We validate our technique by running SPEC2000 CPU benchmark-suite on Simplescalar simulator and show that our technique significantly reduces the performance loss and leakage energy consumption due to process variations. ©2008 IEEE.

关键词： Energy utilization

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A Density-Based Algorithm for Redundant Reader Elimination in a RFID Network

A Density-Based Algorithm for Redundant Reader Elimination i...

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International Conference on Future Generation Communication and Networking (FGCN)

作者： Kun-Ming Yu Chang Wu Yu Zheng-Yi Lin Department of Computer Science and Information Engineering Taiwan Department of Information Management System Taiwan

ISBN: (纸本)9781424440085

Radio frequency identification (RFID) technology has become more sophisticated in recent years and is being developed rapidly for a variety of applications. The problem of eliminating redundant readers has been reduced to the minimum cover problem and proved to be NP-hard. In this paper, a density-based redundant reader elimination algorithm (DRRE) is presented; DRRE eliminates the redundant readers without influencing the number of usable tags. Simulation results demonstrate that the DRRE algorithm performed better in all instances in a variety of environments compared with other algorithms. In a densely deployed RFID network, the DRRE algorithm detected 85% more redundant readers than others.

关键词： Radiofrequency identification Low earth orbit satellites Time division multiple access Algorithm design and analysis Writing Radio frequency computer science Information management Multiaccess communication Frequency division multiaccess

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Torque and rotational speed estimation with parameter identification of Line-start Induction Motor for Motor Operated Valve

Torque and rotational speed estimation with parameter identi...

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International Conference on Control, Automation and systems ( ICCAS)

作者： Akiko Takahashi Ryuichi Oguro Kenta Sakane Department of Computer Science and System Engineering Kyushu Institute of Technology Fukuoka Japan

This paper presents a torque and rotational speed estimation method for line-start induction motor operated valves. Routine inspections are carried out to those valves, because motor operated valves are used in the serious plant such as power plant. and securing reliability is an extreme important matter for these systems. Movement environments in these plants are high temperature and humidity, so it is difficult to put sensors near motors. In such a case, we must find the trouble of the system without torque sensor or speed sensor. The proposal method can estimate the torque and rotational speed of induction motor by using time-series data of voltages and currents at the switchboard. Furthermore, we propose the parameter identification method of mutual inductance by comparing the inner and outer products between voltages and currents. First, a torque and rotational speed of induction motor are estimated. Next, a mutual inductance parameter is got. Last, the proposed estimation method is verified by results of experiment.

关键词： Parameter estimation Induction motors Torque Valves Power system reliability Temperature sensors Sensor systems Voltage Inductance Inspection

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