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International Conference on Consumer Electronics, ICCE '06

作者： Bae, Byungjun Kim, Woosuk Ann, Choonhyun Lee, Soo In Sohng, Kyu-Ik Broadcasting System Research Group Electronics and Telecommunications Research Institute Korea Republic of School of Electrical Engineering and Computer Science Kyungpook National University Korea Republic of

ISBN: (纸本)0780394593

In this paper, we present the architecture of the interactive T-DMB system using the CDMA network for the new interactive broadcasting services. We also propose the structure of the new platform based on WIPI to link broadcasting and telecommunication. We verify the proposed platform with various interactive data contents after implementing it. This shows the possibilities of new interactive services in the digital broadcasting by utilizing the mobility of T-DMB and CDMA. © 2006 IEEE.

关键词： Mobile antennas

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Topological localization based on salient regions in unknown environments

Topological localization based on salient regions in unknown...

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18th International Conference on Pattern Recognition, ICPR 2006

作者： Lu, Wang Yuling, Li Zixing, Cai Center of Intelligent System and Software School of Information Science and Engineering Central South University Changsha Hunan province China Department of Computer Science ZhongYuan University of Technology Zhengzhou Henan province China

ISBN: (纸本)0769525210

This paper presents a new topological localization system for mobile robot navigation based on salient visual regions. These salient regions are obtained by computing the opponencies of color and texture among multi-scale image spaces. Then they are organized to construct the vertex of topological map using hidden Markov model. So localization problem can be transformed to the evaluation problem of HMM. In our system, the topological map of environment can be created online and the robot locates itself concurrently. Experiments show that higher ratio of vertex recognition, that is localization, is obtained. And our system can guarantee mobile robot navigation safely in unknown environments. © 2006 IEEE.

关键词： Pattern recognition

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An energy-efficient partitioned instruction cache architecture for embedded processors

An energy-efficient partitioned instruction cache architectu...

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作者： Kim, CheolHong Chung, SungWoo Jhon, ChuShik CAE Center System LSI Division Samsung Electronics Yongin-Si Gyeonggi-Do 449-711 Korea Republic of Department of Computer Science and Engineering Korea University Anam-dong Syngbuk-ku Seoul 136-701 Korea Republic of School of Computer Science and Engineering Seoul National University Seoul 151-742 Korea Republic of Samsung Electronics Korea Republic of Department of Computer Science and Engineering Korea University Korea Republic of Department of Electrical Engineering and Computer Science Seoul National University Korea Republic of

Energy efficiency of cache memories is crucial in designing embedded processors. Reducing energy consumption in the instruction cache is especially important, since the instruction cache consumes a significant portion of total processor energy. This paper proposes a new instruction cache architecture, named Partitioned Instruction Cache (PI-Cache), for reducing dynamic energy consumption in the instruction cache by partitioning it to smaller (less power-consuming) sub-caches. When the proposed PI-Cache is accessed, only one sub-cache is accessed by utilizing the temporal/spatial locality of applications. In the meantime, other sub-caches are not accessed, leading to dynamic energy reduction. The PI-Cache also reduces dynamic energy consumption by eliminating the energy consumed in tag lookup and comparison. Moreover, the performance gap between the conventional instruction cache and the proposed PI-Cache becomes little when the physical cache access time is considered. We evaluated the energy efficiency by running a cycle accurate simulator. SimpleScalar, with power parameters obtained from CACTI. Simulation results show that the PI-Cache improves the energy-delay product by 20%-54% compared to the conventional direct-mapped instruction cache. Copyright © 2006 The Institute of Electronics, Information and Communication Engineers.

关键词： computer architecture

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REPLICA2Pro: Task relocation by bitstream manipulation in virtex-II/Pro FPGAs

REPLICA2Pro: Task relocation by bitstream manipulation in vi...

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3rd Conference on Computing Frontiers 2006, CF '06

作者： Kalte, Heiko Porrmann, Mario University of Western Australia School of Computer Science and Software Engineering 35 Stirling Highway Crawley WA 6009 Heinz Nixdorf Institute System and Circuit Technology University of Paderborn 33102 Paderborn Germany

ISBN: (纸本)1595933026

One vision of dynamic hardware reconfiguration is to deliver virtually unlimited hardware resources to a set of hardware tasks implementing arbitrary functions. By using partial reconfiguration, these tasks can be allocated and de-allocated on the reconfigurable architecture while others continue to operate. However, the exact placement of each task can only be determined during runtime according to the current resource allocation. This requires relocating each task from its original position after place and route to an area of available resources. The process of relocating tasks can result in a major time overhead. In order to solve this problem we have developed the REPLICA2Pro (Relocation per online Configuration Alteration in Virtex-2/-Pro) filter, which is capable of performing task relocations by manipulating the task's bitstream during the regular allocation process without any extra time overhead. The filter architecture, our reconfigurable system approach as well as our design flow and an experimental system setup are presented in this paper. Copyright 2006 ACM.

关键词： Field programmable gate arrays (FPGA)

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Deterioration of insulated wire by corona discharge

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IEEJ Transactions on Power and Energy 2006年第12期126卷 1261-1266+10页

作者： Yamashita, Takahiko Ishihara, Takeshi Kawaguchi, Masashi Fujishima, Tomoyuki Matsuo, Hisao Furuta, Masakazu Department of Electrical and Electronic Engineering Nagasaki University 1-14 Bunkvo-machi Nagasaki 852-8521 Japan Department of Electrical Engineering and Computer Science Graduate School of Science and Technology Nagasaki University 1-14 Bunkyo-machi Nagasaki 852-8521 Japan Department of System Science Graduate School of Science and Technology Nagasaki University 1-14 Bunkyo-machi Nagasaki 852-8521 Japan Kumamoto Branch Kyushu Electric Power Co. Inc. 1-6-36 Kamisuizennzimati Kumamoto 862-0951 Japan

In relation to the accidents due to bird nests in contact with overhead distribution lines, the authors investigated on deterioration of covered conductor by corona discharge. To simulate the situation where conductive nest material such as wire is in contact with both of an arm and a covered conductor, a copper wire was wound around the covered conductor and was grounded through a resistor which is used to observe corona discharge current waveform. The state of normal operation of 6.6 kV distribution line was considered and A.C. 3.8 kV was applied between the conductor and the ground. Weak corona discharge was observed. In order to carry out the acceleration test, A.C. 6.6 kV was applied. The insulation was punctured after 3760 hours. From the observation of cumulative charge by corona discharge the acceleration factor was estimated about 4. From the acceleration factor estimated, the life of conductor cover will be 627 days.

关键词： Electric wire

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Residual stress evaluation of thin film using strip bending test

Residual stress evaluation of thin film using strip bending ...

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作者： Kim, Jae-Hyun Lee, Hak-Joo Han, Seung-Woo Kim, Jong-Man Baek, Chang-Wook Nano Mechanical System Research Center Korea Institute of Machinery and Materials 171 Jang-dong Yusung-gu Daejeon 305-343 Korea Republic of School of Electrical Engineering and Computer Science Seoul National University Korea Republic of School of Electrical and Electronics Engineering Chung-Ang University Korea Republic of

In this study, we use the strip-bending test to measure the residual stress of a thin film structure. The principle of the strip bending test and the test procedures are described and the analysis of the strip deformation is presented. The explicit formula for estimating the residual stress is given, which requires the initial stress as an input. As an example, the E-beam evaporated Au thin film is chosen, and the residual stress is measured by the present method. The Au thin film structure has a tensile or compressive residual stress depending on the film thickness. The tensile and the compressive residual stresses of Au thin film are successfully measured by the present method.

关键词： Thin films

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Evaluating the Impact of Fault Recovery on Superscalar Processor Performance

Evaluating the Impact of Fault Recovery on Superscalar Proce...

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Pacific Rim International Symposium on Dependable Computing

作者： Toshinori Sato Akihiro Chiyonobu System LSI Research Center Kyushu University Japan Graduate School of Computer Science and System Engineering Kyushu Institute of Technology Japan

Current semiconductor technologies have become susceptible to high-energy neutrons from space. Following the trends in smaller transistors, lower supply voltage, and higher clock frequency, current microprocessors are susceptible to soft errors, which constitute the vast majority of hardware failures. Based on these trends, it is expected that the quality with respect to reliability becomes important as well as performance for microprocessors. In light of this, a lot of fault-tolerance microarchitectures are recently proposed. These studies mainly focus on detecting transient faults, and hence almost every previous study evaluated processor performance in the absence of faults. This analysis only presents the performance impact of constraints introduced by fault detection mechanism. One of the reasons why this evaluation methodology is widely selected is that faults are expected to be rare enough that the overall performance is determined by fault-free behavior. However, evaluating recovery cost of fault tolerant execution is also important, because it is predicted that transient hardware faults occur more frequently as semiconductor technology is improved. Therefore, this paper focuses on recovery from faults

关键词： Space technology Microprocessors Hardware Fault tolerance Fault detection Neutrons Voltage Clocks Frequency Microarchitecture

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Energy efficient distributed coordination function for IEEE 802.11 wireless LAN

Energy efficient distributed coordination function for IEEE ...

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IEEE Radio and Wireless Symposium (RWS formerly RAWCON)

作者： A. El Bourichi T. Tsujimoto H. Yasuura System LSI Reasearch Centre Grade School of Information Science and Computer Engineering Kyushu University Japan

This paper proposes an approach to save the energy consumed by a computer's wireless network interface card (WNIC) due to the wireless communication activity in an IEEE 802.11 wireless local area network (WLAN). The energy efficiency design is considered at the MAC (medium access control) layer, especially in its distributed coordination function (DCF), by reducing automatically the number of retransmissions due to collisions on the wireless channel

关键词： Energy efficiency Wireless LAN Access protocols Batteries computer interfaces computer networks Distributed computing Media Access Protocol Transmitters Large scale integration

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An improved multi-agent approach for solving large traveling salesman problem 1

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9th Pacific Rim International Workshop on Multi-Agents, PRIMA 2006

作者： Tan, Yu-An Zhang, Xin-Hua Xing, Li-Ning Zhang, Xue-Lan Wang, Shu-Wu Department of Computer Science and Engineering Beijing Institute of Technology Beijing 100081 China Information Management College Shandong Economic University Jinan 250014 China Department of Management School of Information System and Management National University of Defense Technology Changsha 410073 China

ISBN: (数字)9783540368601

ISBN: (纸本)3540367071

The traveling salesman problem (TSP) is a very hard optimization problem in the field of operations research. It has been shown to be NP-hard, and is an often-used benchmark for new optimization techniques. This paper proposes an improved multi-agent approach for solving large TSP. This proposed approach mainly includes three kinds of agents with different function. The first kind of agent is conformation agent and its function is generating the new solution continuously. The second kind of agent is optimization agent and its function is optimizing the current solutions group. The third kind of agent is refining agent and its function is refining the best solution from the beginning of the trial. At same time, there are many sub-agents in each kind of agent. These sub-agents accomplish the task of its superior agent cooperatively. At the end of this paper, the experimental results have shown that the proposed hybrid approach has good performance with respect to the quality of solution and the speed of computation. © Springer-Verlag Berlin Heidelberg 2006.

关键词： Multi agent systems

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Effect of Directional Antennas on Spatiotemporal Sampling in Clustered Sensor Networks

Effect of Directional Antennas on Spatiotemporal Sampling in...

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2006 IEEE Wireless Communications and Networking Conference (WCNC 2006), vol.4

作者： Qingjiang Tian Seema Bandyopadhyay Edward J. Coyle Center for Wireless System and Applications CWSA School of Electrical and Computer Engineering Purdue University West Lafayette IN USA School of Electrical Engineering and Computer Science University of Central Florida Orlando FL USA

In a sensor cluster, a large number of geographically distributed sensor nodes each make local measurements and transmit them toward the clusterhead. The clusterhead may schedule simultaneous transmissions from nodes within the cluster by identifying non-interfering areas in the cluster. Directional antennas that are oriented toward the clusterhead may increase spatial reuse and thus increase the number of simultaneous transmissions. On the other hand, the antennas' narrower coverage areas may reduce connectivity, thus reducing the number of sensors from which data can be collected. In this paper, we investigate this tradeoff between spatial reuse and connectivity in the context of the spatiotemporal sampling rate that can be achieved by the cluster. We also propose a simple analytical approach to optimizing the antennas beam width in order to improve the spatiotemporal sampling rate by maximizing the transport capacity of the network.

关键词： Directional antennas Spatiotemporal phenomena Sampling methods Intelligent networks Wireless sensor networks Signal processing algorithms Sensor phenomena and characterization Sensor systems and applications Clustering algorithms Analytical models

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