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International Symposium on Voronoi Diagrams in science and engineering (ISVD)

作者： Kimikazu Kato Hiroshi Imai Keiko Imai Nihon Unisys Limited & Department of Computer Science University of Tokyo Japan Department of Computer Science University of Tokyo Japan Department of Information and System Engineering Chuo University Japan

Numerical estimation of quantum channel capacity is an important problem both theoretically and practically. Oto et al. showed an effective approximation algorithm to compute a capacity of a one-qubit quantum channel. In this paper, we show an explicit upper bound for the error of their algorithm. The algorithm might be repeatedly used in the verification of a certain equation or inequality. The bound of the error we give is a criterion to decide when to stop that iteration, and eventually it can improve the performance of the whole process of the calculation.

关键词： Error analysis Channel capacity Quantum computing Quantum mechanics computer science Upper bound Equations systems engineering and theory Approximation algorithms computer errors

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Solutions for Real Chip Implementation Issues of NoC and Their Application to Memory-Centric NoC

Solutions for Real Chip Implementation Issues of NoC and The...

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International Symposium on Networks-on-Chip (NOCS)

作者： Donghyun Kim Kwanho Kim Joo-Young Kim Seung-Jin Lee Hoi-Jun Yoo Semiconductor System Laboratory Department of Electronic Engineering and Computer Science Korea Advanced Institute of Science and Technology Daejeon South Korea

This paper describes real chip implementation issues of network-on-chip (NoC) and their solutions along with series of chip design examples. The solutions described in this paper cover both architectural aspects and circuit level techniques for practical chip implementation of NoC. As for architecture level solutions, topology selection, chip-aware protocol design, and on-chip serialization (OCS) for link area reduction are explained. For circuit level techniques, SERDES and synchronizer design, crossbar switch partial activation, and low-voltage link are presented as the foundations for power and area efficient NoC implementation. Regarding presented solutions for NoC implementation, this paper proposes memory centric NoC (MC-NoC) for homogeneous multi processor SoC (MPSoC). Flexibility and feasibility of task mapping on homogeneous SoC is the key feature of the MC-NoC. 8 dual port SRAMs connected to crossbar switches in hierarchical star topology network facilitate data communication between processors, regardless of task mapping into the MC-NoC. Experimental result obtained by mapping edge detection tasks on the MC-NoC in various configurations shows almost constant performance. This result proves the effectiveness of the proposed architecture. The MC-NoC based SoC is also implemented on TSMC 0.18 um process technology

关键词： Network-on-a-chip Switches Network topology Chip scale packaging Circuit topology Protocols Switching circuits Communication switching Data communication Image edge detection

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An 81.6 GOPS Object Recognition Processor Based on NoC and Visual Image Processing Memory

An 81.6 GOPS Object Recognition Processor Based on NoC and V...

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29th Annual IEEE Custom Integrated Circuits Conference (CICC 2007), vol.2

作者： Donghyun Kim Kwanho Kim Joo-Young Kim Seungjin Lee Hoi-Jun Yoo Semiconductor System Laboratory Department of Electronic Engineering and Computer Science Korea Advanced Institute of Science and Technology Daejeon South Korea

An 81.6 GOPS object recognition processor is developed by using NoC and Visual Image Processing (VIP) memory. SIFT (Scale Invariant Feature Transform) object recognition requires huge computing power and data transactions among tasks. The chip integrates 10 SIMD PEs for data/task level parallelism while the NoC facilitates inter-PE communications. The VIP memory searches local maximum pixel inside a 3×3 window in a single cycle providing 65.6 GOPS. The proposed processor achieves 15.9fps SIFT feature extraction at 200MHz.

关键词： Object recognition Network-on-a-chip Image processing Parallel processing Vehicle detection computer architecture Intelligent robots Concurrent computing Filtering Energy consumption

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Implementation of Memory-Centric NoC for 81.6 GOPS object recognition processor

Implementation of Memory-Centric NoC for 81.6 GOPS object re...

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IEEE Asian Conference on Solid-State Circuits (ASSCC)

作者： Donghyun Kim Kwanho Kim Joo-Young Kim Seungjin Lee Hoi-Jun Yoo Semiconductor System Laboratory Department of Electronics Engineering and Computer Science Korea Advanced Institute of Science and Technology Daejeon South Korea

An 81.6 GOPS object recognition processor based on memory-centric NoC (MC-NoC) is implemented in a 0.18-mum CMOS technology. The MC-NoC facilitates data transactions among 10 SIMD processing elements (PEs) by exploiting 8 visual image processing (VIP) memories. The 10 PEs implement special SIMD instructions to perform Gaussian filtering at 16 GOPS. The 8 VIP memories provide one cycle local maximum pixels search operation performing 65.6 GOPS. The chip dissipates 1.4 W at 200 MHz operating frequency.

关键词： Network-on-a-chip Object recognition Parallel processing CMOS technology Image processing Intelligent robots Energy consumption Pixel Memory management Communication channels

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An Online Semi-Supervised Clustering Algorithm Based on a Self-organizing Incremental Neural Network

An Online Semi-Supervised Clustering Algorithm Based on a Se...

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International Joint Conference on Neural Networks (IJCNN)

作者： Youki Kamiya Toshiaki Ishii Shen Furao Osamu Hasegawa Department of Computer Intelligence and System Science Tokyo Institute of Technology Yokohama Japan Imaging Science and Engineering Laboratory Tokyo Institute of Technology Japan Department of Computer Science Nanjin University China

This paper presents an online semi-supervised clustering algorithm based on a self-organizing incremental neural network (SOINN). Using labeled data and a large amount of unlabeled data, the proposed semi-supervised SOINN (ssSOINN) can automatically learn the topology of input data distribution without any prior knowledge such as the number of nodes or a good network structure; it can subsequently divide the structure into sub-structures as the need arises. Experimental results we obtained for artificial data and real-world data show that the ssSOINN has superior performance for separating data distributions with high-density overlap and that ssSOINN Classifier (S3C) is an efficient classifier.

关键词： Clustering algorithms Neural networks Semisupervised learning Artificial neural networks Humans Network topology Supervised learning Stability Algorithm design and analysis Robustness

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Development of anti-loosening performance of hyper lock nut (1st report, elasto-plastic analysis by three-dimensional finite element method)

Nihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japa...

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Nihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C 2007年第3期73卷 841-848页

作者： Nishiyama, Shuji Migita, Hiroaki Kataoka, Mitumasa Nakasaki, Nobuyuki Murano, Kohshi Department of Systems Engineering for Sports Faculty of Computer Science and System Engineering Okayama Prefectural University 111 Kuboki Soja shi Okayama 719-1197 Japan

Bolted joints are widely used in mechanical structures since the disassembly for maintenance is easy without high cost. However, vibration induced loosing due to dynamic loading has been unsolved subject for a long time. We have developed a new type of nut named 'hyper lock nut (HLN), which realizes anti-loosening performance without complicated tightening process and tool. In this study, we have investigated the mechanisms of bolted joint with HLN, and tightening behavior are analyzed by mean of three-dimensional finite element method. Results are compared with the experimental results for HLN. Good qualitative agreement is observed between analytical results and experiments with respect to displacement, tightening force and tightening torque. We found some new aspects and superior points for bolted-joint with HLN than that of standard nuts. It is found that tightening torque of HLN is higher than that of standard. It is also found that the anti-loosening performance can be realized by the thread contact force at the slit region and angular facing on bearing surface. Moreover, by mean of tensile and fatigue experiments, it is concluded that HLN involves sufficient strength in practical use.

关键词： Nuts (fasteners)

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Effects of spatial structures on evolution of iterated prisoner’s dilemma game strategies with probabilistic decision making

Effects of spatial structures on evolution of iterated priso...

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Congress on Evolutionary Computation

作者： Ken Ohara Yusuke Nojima Yumeka Kitano Hisao Ishibuchi Department of Computer Science and Inteligent System Graduate School of Engineering Osaka Prefecture University Sakai Osaka Japan

We have examined the effect of spatial structures on the evolution of iterated prisoner's dilemma (IPD) game strategies. In our former study, we used two neighborhood structures, which follow the concept of structured demes. One is for the interaction among players through the IPD game. A player in each cell in a grid-world plays against its neighbors defined by this neighborhood structure. The other is for the mating of strategies by genetic operations. A new strategy for a player is generated by genetic operations from a pair of parent strings, which are selected from its neighbors defined by the second neighborhood structure. In this paper, we extend our IPD game simulation to a more realistic problem while keeping the simplicity of the original IPD game. We employ a stochastic strategy represented by a string of real numbers between 0 and 1. Each real number in the string denotes the probability of cooperation. We examine the effects of spatial structures on the evolution of IPD game strategies with probabilistic decision making in various payoff matrices. From simulation results, it is shown that cooperative behavior is evolved only when the interaction neighborhood is small and the mating neighborhood is also small for some payoff matrices.

关键词： Game theory Decision making Evolutionary computation

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Bridge information assurance education gap between the majority and minority universities through collaboration

Bridge information assurance education gap between the major...

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6th IEEE/ACIS International Conference on computer and Information science, ICIS 2007;1st IEEE/ACIS International Workshop on e-Activity, IWEA 2007

作者： Yu, H. Yuan, X. Xu, J. Providence, S. Chu, B. Gu, D. Department of Computer Science NC A and T State University Greensboro NC United States Department of Software Engineering and Information System University of NC at Charlotte Charlotte NC United States Oracle Corp. 400 Oracle Parkway Redwood Shores CA United States

ISBN: (纸本)0769528414

Information security and assurance is a rapidly developing area therefore government and industry have high demand for information security professionals. This paper reports collaboration activities between North Carolina A&T State University (NC A&T SU) and University of North Carolina (UNC) Charlotte as well as results and lessons learned. Leveraging the strength of the department of Software engineering and Information system at UNC Charlotte the department of computer science at NC A&T SU has established the new Information Assurance (IA) concentration undergraduate curriculum. Four new IA courses, five IA interactive simulation software packages and two isolated IA laboratories are developed. Faculty members in both universities have collaborated to manage and mentor the Cyber-Defender programs, host IA and Cyber Security symposiums, submit proposals, advise graduate students and publish papers. The outcome exhibits that the collaboration between the majority and minority universities serves as a pathway for the minority university to build competencies in information assurance, and bridged the widening "information assurance gap" between majority and minority universities. © 2007 IEEE.

关键词： Security of data

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Spatiotemporal Analysis of an Agent-Based Model of a Colony of Keratinocytes: A First Approach for the Development of Validation Methods

Spatiotemporal Analysis of an Agent-Based Model of a Colony ...

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IEEE Symposium on Bioinformatics and Bioengineering (BIBE)

作者： Cesar Pichardo-Almarza Rod Smallwood S. A. Billings Department of Computer Science University of Sheffield Sheffield UK Department of Automatic Control and System Engineering University of Sheffield Sheffield UK

Agent-based models are widely used for the simulation of systems from several domains (biology, economics, meteorology, etc). In biology agent-based models are very useful for predicting the social behaviour of systems; in particular they seem well adapted to model the behaviour of a cell population. In this paper an agent-based model, developed to study normal human keratinocytes (tissue cells), will be investigated. This kind of model exhibits probabilistic behaviour and the validation of simulation results is often done with a qualitative analysis by the experts (biologists). The main objective of this paper is to propose new variables and metrics that allow the comparison and a possible quantitative validation using numerical results from simulations.

关键词： Spatiotemporal phenomena Biological system modeling Cells (biology) systems biology Computational biology Predictive models Economic forecasting Meteorology Humans Analytical models

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Design Issues of Semantic Service Discovery for Ubiquitous Computing

Design Issues of Semantic Service Discovery for Ubiquitous C...

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International Conference on Multimedia and Ubiquitous engineering (MUE)

作者： Reen-Cheng Wang Yao-Chung Chang Ruay-Shiung Chang Department of Computer Science and Information Engineering National Dong Hwa University Taiwan Department of Information Science and Management System National Taitung University Taiwan

Services in the ubiquitous computing are heterogeneous in nature. To be pervasive, these services should be defined in terms of their functionality and capabilities rather than the meaningless UUIDs or types of services. Thus, clients can access the proper service based on semantic requests. In this paper, we study the demand of semantic query in service discovery processes. Current discovery protocols and the concept of semantics are bringing together to construct a framework to realize the semantic service discovery for ubiquitous computing. Many issues are discussed in relation to service discovery topologies, ontology languages, and semantic query languages.

关键词： Ubiquitous computing Bluetooth Topology Ontologies Database languages Web services computer science Access protocols Pattern matching Design engineering

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