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International Joint Conference on Neural Networks (IJCNN)

作者： T. Kondo K. Ito Department of Computer Information and Communication Sciences Tokyo University of Agriculture슠and슠Technology Koganei Tokyo Japan Department of Computational Intelligence and Systems Science Interdisciplinary Graduate School of Science and Engineering Tokyo Institute of Technology Yokohama Japan

Regardless of complex, unknown, and dynamically-changing environments, living creatures can recognize situated environments and behave adaptively by theirselves in real-time. However it is impossible to prepare optimal motion trajectories with respect to every possible situations in advance. The key concept for realizing suitable environmental cognition and motor adaptation is a context-based elicitation of constraints which are canalizing well-suited sensorimotor coordination. For this aim, in this study, we propose a polymorphic neural networks model called CTRNN+NM (CTRNN with neuromodulatory bias). The proposed model is applied to two dimensional arm-reaching movement control in various viscous curl force fields. The model parameters were optimized by GA. Simulation results reveal that the proposed model inherits high robustness even though it is situated in unexperienced environment, which has same curl but different size of viscous force, since it evolved "how to adapt" instead of "how to move.".

关键词： Neural networks Cognition Biological neural networks Real time systems Force control Force sensors Predictive models Irrigation Spatiotemporal phenomena Robot control

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Measuring Generality of Documents

Measuring Generality of Documents

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International Conference on Data Engineering Workshops

作者： Hyun Woong Shin E. Hovy D. McLeod L. Pryor Computer Science Department Integrated Media Systems Center University of Southern California Los Angeles CA USA Computer Science Department Institute of the Information Science University of Southern California Marina del Rey CA USA Annenberg School for Communication University of Southern California Los Angeles CA USA

Most traditional Information Retrieval (IR) systems, including web search engines, operationalize "relevant" as the word frequency in a document of a set of keywords. Because of this limitation, traditional IR systems frequently retrieve irrelevant documents in response to a user’s request. In this paper, we propose a new criterion, "generality," that provides an additional basis on which to rank retrieved documents. The generality is a level of abstraction to retrieve results based on desired generality appropriate for a user’s knowledge and interests. We compared our generality quantification algorithm with human judges’ weighting of values to show that the developed algorithm is significantly correlated.

关键词： Ontologies Information retrieval Frequency computer science Humans Information science Web search Search engines Testing Data engineering

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Multi-Objective Evolutionary Clustering using Variable-Length Real Jumping Genes Genetic Algorithm

Multi-Objective Evolutionary Clustering using Variable-Lengt...

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International Conference on Pattern Recognition

作者： K.S. Nawaz Ripon Chi-Ho Tsang S. Kwong Man-Ki Ip Department of Computer Science City University of Hong Kong Kowloon Hong Kong China Communication Systems Division Fujitsu Hong Kong Limited Causeway Bay Hong Kong China

ISBN: (纸本)0769525210

In this paper, we present a novel multi-objective evolutionary clustering approach using variable-length real jumping genes genetic algorithms (VRJGGA). The proposed algorithm that extends jumping genes genetic algorithm (JGGA) (Man et al., 2004) evolves near-optimal clustering solutions using multiple clustering criteria, without a-priori knowledge of the actual number of clusters. Experimental results based on several artificial and real-world data show that VRJGGA can obtain non-dominated and near-optimal clustering solutions in terms of different cluster quality measures and classification performance

关键词： Genetic algorithms Biological cells Encoding Clustering algorithms Clustering methods computer science Poles and towers Evolutionary computation Genetic mutations Flowcharts

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Economy-Based Data Replication Broker

Economy-Based Data Replication Broker

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IEEE International Conference on e-science and Grid Computing

作者： Henry Lin J.H. Abawajy Rajkumar Buyya Grid Computing and Distributed Systems Laboratory Department of Computer Science and Software Engineering University of Melbourne Melbourne VIC Australia Grid and Pervasive Computing Laboratory School of Engineering and Information Technology Deakin University Geelong VIC Australia

ISBN: (纸本)9781424430116

Data replication is one of the key components in data grid architecture as it enhances data access and reliability and minimises the cost of data transmission. In this paper, we address the problem of reducing the overheads of the replication mechanisms that drive the data management components of a data grid. We propose an approach that extends the resource broker with policies that factor in user quality of service as well as service costs when replicating and transferring data. A realistic model of the data grid was created to simulate and explore the performance of the proposed policy. The policy displayed an effective means of improving the performance of the grid network traffic and is indicated by the improvement of speed and cost of transfers by brokers.

关键词： Resource management Australia Telecommunication traffic Power generation economics Cost accounting Protocols Grid computing Pervasive computing computer science Software

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QoS-aware adaptive multipath routing protocol in ad hoc networks

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Jisuanji Xuebao/Chinese Journal of computers 2006年第5期29卷 681-689页

作者： Liu, Yong-Qiang Yan, Wei Dai, Ya-Fei Department of Computer Science and Technology Peking University Beijing 100871 China Computer Networks and Distributed Systems Laboratory School of Electronics Engineering and Computer Science Peking University Beijing 100871 China

Based on QoS framework-SWAN, A gateway-centric adaptive QoS-aware multipath routing protocol (GC-AQMR) is presented. It can ensure that each mobile node has a set of link-disjoint and loop-free routing to the gateway. Moreover, the intermediate node in the path also has the multipath information to the gateway. When the intermediate node experiences the congestion or link-break, it can switch adaptively to an alternate path with the additional path information. Simulations have shown that the SWAN system adopting GC-AQMR outperforms the SWAN with AODV protocol on all the performance metrics: Packet delivery ratio, average end-to-end delay/throughput and the fairness among real-time flows.

关键词： computer networks

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Combining Probabilistic Ranking and Latent Semantic Indexing for Feature Identification

Combining Probabilistic Ranking and Latent Semantic Indexing...

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IEEE Workshop on Program Comprehension

作者： D. Poshyvanyk A. Marcus V. Rajlich Y.-G. Gueheneuc G. Antoniol Department of Computer Science Wayne State University Detroit MI USA GEODES-Research Group on Open Distributed Systems Experimental Software Engineering University of Montreal Canada Department of Mathematics and Computer Science Babeş-Bolyai University Cluj-Napoca Romania Département de Génie Informatique École Polytechnique de Montréal Canada

The paper recasts the problem of feature location in source code as a decision-making problem in the presence of uncertainty. The main contribution consists in the combination of two existing techniques for feature location in source code. Both techniques provide a set of ranked facts from the software, as result to the feature identification problem. One of the techniques is based on a scenario based probabilistic ranking of events observed while executing a program under given scenarios. The other technique is defined as an information retrieval task, based on the latent semantic indexing of the source code. We show the viability and effectiveness of the combined technique with two case studies. A first case study is a replication of feature identification in Mozilla, which allows us to directly compare the results with previously published data. The other case study is a bug location problem in Mozilla. The results show that the combined technique improves feature identification significantly with respect to each technique used independently

关键词： Indexing computer science Software engineering Information retrieval Information analysis Data mining Decision making Uncertainty Software debugging Software systems

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Towards a Grid of Sensors for Telemedicine

Towards a Grid of Sensors for Telemedicine

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Annual IEEE Symposium on computer-Based Medical systems

作者： C.O. Rolim F.L. Koch M. Assuncao C.B. Westphall Network and Management Laboratory Federal University of Santa Catarina Florianopolis Santa Catarina Brazil Grid Computing and Distributed Systems Laboratory and NICTA Victoria Laboratory Department of Computer Science and Software Engineering University of Melbourne Melbourne VIC Australia

In this article, we describe a grid of sensors to collect patients' vital data and to allow real time monitoring of patients in heath-care centres. We analyse the problem scenario and identify the components involved towards the construction of an integrated and homogeneous management system. Finally, we present a case study to demonstrate the applicability of our approach

关键词： Telemedicine Grid computing Laboratories Real time systems Sensor systems Patient monitoring computerized monitoring Data security Ontologies computer architecture

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OOCs, Partial Relative Difference Families and a Conjecture of Golomb

OOCs, Partial Relative Difference Families and a Conjecture ...

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IEEE International Symposium on Information Theory

作者： Oscar Moreno Reza Omrani P. Vijay Kumar Solomn W. Golomb Department of Computer Science Gauss Research Laboratory University of Puerto Rico San Juan Puerto Rico Communication Sciences Institute Department of Electrical Engineering-Systems University of Southern California Los Angeles CA USA

ISBN: (纸本)142440505X

The cyclic difference sets constructed by Singer are also examples of perfect distinct difference sets (DDS). The Bose construction of distinct difference sets, leads to a relative difference set. In this paper we introduce the concept of partial relative DDS and prove that an optical orthogonal code (OOC) construction due to Moreno et. al., is a partial relative DDS. We generalize the concept of ideal matrices previously introduced by Kumar and relate it to the concepts of this paper. Another variation of ideal matrices is introduced in this paper: Welch ideal matrices of dimension n by (n - 1). We prove that Welch ideal matrices exist only for n prime. Finally, we recast an old conjecture of Golomb on the Welch construction of Costas arrays using the concepts of this paper. This connection suggests that our construction of partial relative difference sets is in a sense, unique

关键词： Optical sensors Multiaccess communication Optical fiber networks Upper bound systems engineering and theory computer science Gaussian processes Optical control Hamming weight Binary codes

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Semantic-based Grid Resource Discovery and its Integration with the Grid Service Broker

Semantic-based Grid Resource Discovery and its Integration w...

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International Conference on Advanced Computing and communications (ADCOM)

作者： Thamarai Selvi Somasundaram R.A. Balachandar Vijayakumar Kandasamy Rajkumar Buyya Rajagopalan Raman N. Mohanram S. Varun Department of Information Technology Anna University Chennai India Grid Computing and Distributed Systems Laboratory Department of Computer Science and Software Engineering University of Melbourne VIC Australia Centre for Development of Advanced Computing Chennai India Centre for Development of Advanced Computing Bangalore India

This paper addresses the need of semantic component in the grid environment to discover and describe the grid resources semantically. We propose semantic grid architecture by introducing a knowledge layer at the top of Gridbus broker architecture and thereby enabling broker to discover resources semantically. The semantic component in the knowledge layer enables semantic description of grid resources with the help of ontology template. The ontology template has been created using Protege-OWL editor for different types of computing resources in the grid environment. The Globus Toolkit's MDS is used to gather grid resource information and Protege-OWL libraries are used to dynamically create knowledge base of grid resources. Algernon inference engine is used for interacting with the knowledge base to discover suitable resources.

关键词： distributed computing Ontologies Middleware computer architecture computer networks Grid computing Libraries Engines Monitoring Aggregates

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An Asymmetric Key Establishment Protocol for Multiphase Self-Organized Sensor Networks

An Asymmetric Key Establishment Protocol for Multiphase Self...

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12th European Wireless Conference 2006 - Enabling Technologies for Wireless Multimedia communications

作者： Emmanouil Magkos Panayiotis Kotzanikolaou Dimitris D. Vergados Michalis Stefanidakis Ionian University Department of Computer Science Platia Tsirigoti 49100 Corfu Greece University of Piraeus Department of Informatics Karaoli & Dimitriou 18534 Greece University of the Aegean Department of Information and Communication Systems Engineering Karlovassi Samos GR-832 00 Greece

We propose an asymmetric key establishment protocol for decentralized sensor networks (DSN's). The protocol supports multiphase deployment i.e., the sensor nodes are deployed in the network in multiple groups, known as "generations". After their deployment, the nodes of the first generation are engaged in a key establishment protocol, in order to establish secure communication channels with their neighbors. Then, each forthcoming generation initializes a new key establishment phase, which allows the new nodes to communicate with other nodes of their own generation as well as with the older nodes of the network. The protocol extends the hybrid scheme of Kotzanikolaou et al. By making the scheme of "P. Kotzanikolaou et al, Hybrid key establishment for multiphase self-organized sensor networks" fully asymmetric, the proposed protocol corrects a security weakness found in "P. Kotzanikolaou et al, Hybrid key establishment for multiphase self-organized sensor networks" while it does not induce further computation and communication costs.

关键词： Cryptography Performance evaluation Clocks

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