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International Conference on Complex, Intelligent and Software Intensive systems, CISIS

作者： Keita Matsuo Leonard Barolli Fatos Xhafa Akio Koyama Arjan Durresi Makoto Takizawa Graduate School of Engineering Fukuoka Institute of Technology Fukuoka Japan Department of Information and Communication Engineering FIT Fukuoka Japan Department of Languages and Informatics Systems Polytechnic University of Catalonia Barcelona Spain Department of Informatics Yamagata University Yonezawa Yamagata Japan Department of Computer and Information Science Purdue University Indiana University Indianapolis IN USA Department of Computers and System Engineering Tokyo Denki University Hatoyama Saitama Japan

Due to the opportunities provided by the Internet, people are taking advantage of e-learning courses and during the last few years enormous research efforts have been dedicated to the development of e-learning systems. So far, many e-learning systems are proposed and used practically. However, in these systems the e-learning completion rate is low. One of the reasons is the low study desire and motivation. In our previous work, we implemented a e-learning system that is able to increase the learning efficiency by stimulating learners motivation. In this work, we designed and implemented new functions to improve the system performance.

关键词： Electronic learning Electronic mail Materials Distance learning computers History Cellular phones

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Reliable and Energy Efficient Protocol for Wireless Sensor Network

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Tsinghua Science and Technology 2007年第S1期12卷 95-100页

作者：阚保强蔡理徐勇军 College of Science Air Force Engineering University Key Laboratory of Computer System and Architecture Institute of Computing TechnologyChinese Academy of Sciences

Low-power design is one of the most important issues in wireless sensor networks (WSNs) , while reliable information transmitting should be ensured as well. Transmitting power (TP) control is a simple method to make the power consumption down, but excessive interferences from potential adjacent operating links and communication reliability between nodes should be considered. In this paper, a reliable and energy efficient protocol is presented, which adopts adaptive rate control based on an optimal TP. A mathematical model considering average interference and network connectivity was used to predict the optimal TP. Then for the optimal TP, active nodes adaptively chose the data rate with the change of bit-error–rate(BER) performance. The efficiency of the new strategy was validated by mathematical analysis and simulations. Compared with 802.11 DCF which uses maximum unified TP and BASIC protocol, it is shown that the higher average throughput can achieve while the energy consumption per useful bit can be reduced according to the results.

关键词： wireless sensor networks reliable communication energy efficient optimal transmitting power adaptive link control

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An Intelligent Handoff system for Wireless Cellular Networks Using Fuzzy Logic and Random Walk Model

An Intelligent Handoff System for Wireless Cellular Networks...

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2nd International Conference on Complex, Intelligent and Software Intensive systems (CISIS 2008)

作者： Leonard Barolli Fatos Xhafa Arjan Durresi Akio Koyama Makoto Takizawa Department of Information and Communication Engineering Fukuoka Institute of Technology Japan Department of Languages and Informatics Systems Polytechnic University of Catalonia Barcelona Spain Department of Computer and Information Science Purdue University Indiana University Indianapolis IN USA Department of Informatics Yamagata University Yonezawa Japan Department of Computer and System Engineering Tokyo Denki University Hatoyama Saitama Japan

In mobile cellular systems the handover is a very important process to maintain the desired Quality of Service (QoS). Many handover algorithms are proposed in the literature. However, to make a better handover and keep the QoS in wireless networks is very difficult. In this paper, by using random walk model and fuzzy theory we propose a new handover system. The proposed system uses 3 parameters for handoff decision: signal strength from the present Base Station (BS), signal strength from the neighbor BS, and the distance between Mobile Station (MS) and BS. The performance evaluation via simulations shows that proposed system can avoid ping-pong effect and has a good handover decision.

关键词： Distance measurement Layout Electric fields Fault currents Circuit faults Artificial intelligence High definition video

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Improved structural modeling based on conserved domain clusters and structure-anchored alignments

Proceedings of the ACM Symposium on Applied Computing

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Proceedings of the ACM Symposium on Applied Computing 2007年 128-132页

作者： Zhang, Fa Xu, Lin Liu, Zhiyong Yuan, Bo Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy of Science Graduate School Chinese Academy of Science Institute of Computing Technology Chinese Academy of Science Department of Computer Science and Engineering Shanghai Jiaotong University

ISBN: (纸本)1595934804;9781595934802

In this paper, we presented a method to improve structural modeling based on conserved domain clusters and structure-anchored alignments. We first constructed a template library of structural clusters for all conserved sequence domains. Then, for each cluster, we built the profile using the structure and sequence information. Finally we use the profile and structural alignments as anchors to increase the alignment accuracy between a query and its templates. Our preliminary results show that this method can be used for the partial prediction for a majority of known protein sequences with better qualities. Copyright 2007 ACM.

关键词： Proteins

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ROCAS: A Robust Online Algorithm for Spatial Partitioning in Distributed Smart Camera systems

ROCAS: A Robust Online Algorithm for Spatial Partitioning in...

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ACM/IEEE International Conference on Distributed Smart Cameras, ICDSC

作者： Martin Hoffmann Jorg Hahner Institute of Systems Engineering System and Computer Architecture Leibniz Universität Hannover Hanover Germany

Vision based surveillance systems are used for example for the observation of large areas to detect intruders and protect safety critical equipment. These large areas may be maritime ports or aprons of airports and can usually not be guarded solely by human staff due to the costs arising. Most of today's surveillance systems used for the observation of these areas rely on a centralised system architecture with a central entity being the system's single point of failure. In this paper, a self-optimising system architecture for networked SCs is proposed. This implies SCs being able to decide autonomously how to arrange their fields of view to achieve an optimal spatial surveillance coverage. Additionally, a distributed algorithm allowing for online spatial partitioning and detection of failing nodes is described and evaluated. The evaluation shows that near optimal spatial partitioning can be achieved without any node having knowledge of all cameras in the system.

关键词： Robustness Partitioning algorithms Smart cameras Surveillance Machine vision Protection Safety devices Airports Humans Costs

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A parallel algorithm for RNA secondary structure prediction

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WSEAS Transactions on systems 2007年第2期6卷 328-334页

作者： Che, Yanqiu Tang, Zheng Cao, Qiping Liu, Shaozhi Department of Intellectual Information Systems Engineering Toyama University 3190 Gofuku Toyama 930-8555 Japan Tateyama Institute of System Toyama 930-0004 Japan Hokuriku Computer Service Co. Ltd. Toyama 939-2708 Japan

RNA secondary structure prediction is a broadly studied problem and remains a challenging task in molecular biology. In this paper, we present a new parallel algorithm based on the improved transiently chaotic neural network (TCNN) for predicting RNA secondary structure. It consists of three steps. First, Search and list all possible helices. Second, consider the RNA secondary structure prediction problem as the maximum independent set problem. Third, apply the proposed improved transiently chaotic neural network to solve the problem and achieve the predicted RNA secondary structure. In order to demonstrate the confidence of the proposed algorithm, tests on three RNA sequences: tRNAphe, pre-tRNAtyr and Saccharomyces cerevisiae are performed. The results show that the proposed parallel algorithm is effective and has an accepted accuracy compared with the most-used method.

关键词： Parallel algorithms

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Protein structure superposition by curve moment invariants and iterative closest point

Protein structure superposition by curve moment invariants a...

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2007 1st International Conference on Bioinformatics and Biomedical engineering, ICBBE

作者： Xu, Dong Li, Hua Gu, Tongjun Key Laboratory of Intelligent Information Processing Key Laboratory of Computer System and Architecture National Research Center for Intelligent Computing Systems Institute of Computing Technology Chinese Academy of Sciences Center for Systems Biology Institute of Biophysics Chinese Academy of Sciences Graduate University Chinese Academy of Sciences

ISBN: (纸本)1424411203

Superimpose one protein tertiary structure to another can help to find similarity between them and further identify functional and evolutionary relationships. We first extract invariant features under rigid body transformation for each protein backbone which is represented by alpha-carbons of all the residues. Then, the invariant features are embedded with Iterative Closest Point algorithm for superposition. With several initialized orientations, pairwise alignment can be achieved accurately only by few iterations. Experiments indicate that our proposed algorithm is competitive with several well-known algorithms and with smallest root mean squared distance. © 2007 IEEE.

关键词： Proteins

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Common substructure extraction of proteins by geometric invariants

Common substructure extraction of proteins by geometric inva...

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10th International Conference on computer-Aided Design and computer Graphics

作者： Xu, Dong Li, Hua Gu, Tongjun Key Laboratory of Intelligent Information Processing Institute of Computing Technology Chinese Academy of Sciences Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy of Sciences National Research Center for Intelligent Computing Systems Institute of Computing Technology Chinese Academy of Sciences Center for Systems Biology Institute of Biophysics Chinese Academy of Sciences Graduate University Chinese Academy of Sciences

ISBN: (纸本)9781424415786

Structure alignment could help to find shape similarities between proteins and guide structure classification and fold recognition. Common substructure detection and extraction are especially important, for which could guide the biologist to discover binding site or active site. We represent each segment of alpha-carbon backbone by using dihedral angles and curve moment invariants. Then, local and global structure alignment could be performed by iterative closest point algorithm. Maximum common substructures between a pair of proteins or within a protein could be found. Active sites also could be detected by the proposed algorithm.

关键词： Proteins

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cco-exist with other services on a VM-based virtualized computing platform?

cco-exist with other services on a VM-based virtualized comp...

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2007 Asian Technology Information Program's (ATIP's) 3rd Workshop on High Performance Computing in China - Solution Approaches to Impediments for High Performance Computing, CHINA HPC'07

作者： Song, Ying Wang, Hui Li, Yaqiong Sun, Yuzhong Zeng, Yu Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing 100080 China National Research Center for Intelligent Computing Systems ICT Beijing 100080 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

ISBN: (纸本)9781595939036

Trend towards providing heterogeneous services concurrently by ISPs and low utilization of servers make it necessary to consolidate various services computing into a single platform. In such a shared environment, meeting application-level QoS goals and avoiding interaction among services become challenges as each application consumes different amount of resource and requires different QoS. Video-on-demand (VoD) has been identified as an important application among multimedia services. In this paper, we study a case of interaction among services concurrently running on a virtualized computing environment. The contributions of this paper are follows. 1) We design a novel capability service computing framework for service computing consolidation (CSCF) to study the interaction among concurrent services in a VM-Based Virtualized Computing Environment;2) A dynamic and lazy memory flowing algorithm (DLMFaVM) among VMs is proposed to partially fulfill this computing model by resource flowing;3) We also develop a virtualized computing platform to study the possibility of service computing consolidation;4) We analyze the interaction among VoD service and other typical enterprise services in our capability service computing environment and draw a conclusion that the VoD streaming service co-existing with other services on a VM-based virtualized computing platform is a trend for ISPs. But it presents some challenges for the designers of service soft and the designers of service computing platform. Copyright 2007 ACM.

关键词： Video on demand

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3-D projective moment invariants

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Journal of Information and Computational Science 2007年第2期4卷 821-828页

作者： Xu, Dong Li, Hua Key Laboratory of Intelligent Information Processing Institute of Computing Technology Chinese Acad. of Sci. Beijing 100080 China Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Acad. of Sci. Beijing 100080 China National Research Center for Intelligent Computing Systems Institute of Computing Technology Chinese Acad. of Sci. Beijing 100080 China Graduate University Chinese Acad. of Sci. Beijing 100080 China

2-D projective moment invariants were firstly proposed by Suk and Flusser in [12]. We point out here that there is a useless projective moment invariant which is equivalent to zero in their paper. 3-D projective moment invariants are generated theoretically by investigating the property of signed volume of a tetrahedron. The main part is the selection of permutation invariant cores for multiple integrals to generate independent and nonzero 3-D projective moment invariants. We give the conclusion that projective moment invariants don't exist strictly speaking because of their convergence problem.

关键词： computer vision

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