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Mobility Effects of Wireless Multi-hop Networks in Indoor Scenarios

Mobility Effects of Wireless Multi-hop Networks in Indoor Sc...

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International Conference on Advanced Information Networking and Applications (AINA)

作者： Makoto Ikeda Masahiro Hiyama Leonard Barolli Fatos Xhafa Arjan Durresi Makoto Takizawa Fukuoka Institute of Technology Fukuoka Japan Department of Information and Communication Engineering Fukuoka Institute of Technology Fukuoka Japan Department of Languages and Informatics Systems Technical University of Catalonia Barcelona Spain Department of Computer and Information Science Indiana University-Purdue University Indianapolis Indianapolis IN USA Department of Computers and Information Science Seikei University Musashino Tokyo Japan

A Mobile Ad hoc Network (MANET) is a collection of wireless mobile terminals that are able to dynamically form a temporary network without any aid from fixed infrastructure or centralized administration. In recent years, MANETs are continuing to attract the attention for their potential use in several fields such as military activities, rescue operations and time-critical applications. In this paper, we present the implementation and analysis of our implemented wireless multi-hop network testbed considering the Optimized Link State Routing (OLSR) protocol for wireless multi-hop networking. We investigate the effect of mobility and topology changing in MANET. We study the impact of best-effort traffic for non line of sight communication. In this work, we consider three models: stationary, mobility and non line of sight communication models. We assess the performance of our testbed in terms of throughput and packet loss. From the experimental results, we found that OLSR has not a good performance when the relay node is moving. Also, the performance deteriorates when the CBR is higher.

关键词： Spread spectrum communication Mobile ad hoc networks Testing Time factors Routing protocols Wireless application protocol Network topology Telecommunication traffic Traffic control Performance loss

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Improving QoS of Multi-layer Networks-on-Chip with Partial and Dynamic Reconfiguration of Routers

Improving QoS of Multi-layer Networks-on-Chip with Partial a...

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International Conference on Field Programmable Logic and Applications

作者： Leandro Möller Peter Fischer Fernando Moraes Leandro Soares Indrusiak Manfred Glesner Darmstadt University of Technology Institute of Microelectronic Systems Darmstadt Germany Faculty of Informatics Catholic University of Rio Grande do Sul Sul-Porto Alegre Brazil Department of Computer Science University of York York United Kingdom

Networks-on-Chip (NoC) allow several data transfers to occur in parallel and are indeed the communication infra-structure of future hundred-cores Systems-on-Chip (SoCs). However, if specialized modules are sending data at full speed to the NoC, Quality of Service (QoS) can be no longer guaranteed. This work presents a multi-layer mesh NoC approach to improve the QoS of such communication hungry SoCs. While one mesh layer is fixed in the system for control purposes, other data layers can be configured at runtime to provide the desired data throughput required by the application. This is accomplished by partially and dynamically reconfiguring the data layer routers. Arbitration algorithms, routing algorithms and huge crossbars are removed from the data layer routers, because all data routers in the path a configured accordingly before its utilization. A SoC following this idea was prototyped in a Virtex-4 FPGA and the Early Access Partial Flow was used to partially and dynamically reconfigure the NoC. We show that 120 (5!) different configurations are needed for each reconfigurable router with 5 bidirectional ports. Each configuration requires 33KB of memory and occupies 32 CLBs of area.

关键词： IP networks Nickel Field programmable gate arrays Clocks Quality of service System-on-a-chip Wires

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Using Bi-clustering Algorithm for Analyzing Online Users Activity in a Virtual Campus

Using Bi-clustering Algorithm for Analyzing Online Users Act...

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International Conference on Intelligent Networking and Collaborative Systems (INCOS)

作者： Fatos Xhafa Santi Caballé Leonard Barolli Alberto Molina Rozeta Miho Department of Languages and Informatics Systems Technical University of Catalonia Spain Dept. of Languages and Informatics Systems Technical University of Catalonia Spain Department of Computer Science Multimedia & Telecommunication Open University of Catalonia Spain Dept. of Information and Communication Engineering Fukuoka Institute of Technology Fukuoka Japan Department of Information and Communication Engineering Fukuoka Institute of Technology Fukuoka Japan Faculty of Information Technologies Technical University of Tirana Albania Dept. of Computer Sci. Multimedia & Telecommunication Open University of Catalonia Spain Technical University of Tirana Albania

Data mining algorithms have been proved to be useful for the processing of large data sets in order to extract relevant information and knowledge. Such algorithms are also important for analyzing data collected from the users' activity users. One family of such data analysis is that of mining of log files of online applications that register the actions of online users during long periods of time. A relevant objective in this case is to study the behavior of online users and feedback the design processes of online applications to provide better usability and adaption to users' preferences. The context of this work is that of a virtual campus in which thousands of students and tutors carry out the learning and teaching activity using online applications. The information stored in log files of virtual campuses tend to be large, complex and heterogeneous in nature. Hence, their mining requires both efficient and intelligent processing and analysis of user interaction data during long-term learning activities. In this paper, we present a bi-clustering algorithm for processing large log data sets from the online daily activity of students in a real virtual campus. Our approach is useful to extract relevant knowledge about user activity such as navigation patterns, activities performed as well as to study time parameters related to such activities. The extracted information can be useful not only to students and tutors to stimulate and improve their experience when interacting with the system but also to the designers and developers of the virtual campus in order to better support the online teaching and learning.

关键词： Data mining Web sites Organizations Adaptation model Navigation Registers Context

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Vision-based human motion analysis in epilepsy - Methods and challenges

Vision-based human motion analysis in epilepsy - Methods and...

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IEEE EMBS International Conference on Information technology Applications in Biomedicine (ITAB)

作者： M. Pediaditis M. Tsiknakis P. Vorgia D. Kafetzopoulos V. Danilatou D. Fotiadis Institute of Health Care Engineering Graz University of Technology Austria Biomedical Informatics Laboratory Institute of Computer Science FORTH Crete Greece Department of Applied Informatics and Multimedia Technological Educational Institute of Crete Greece Mother and Child Division Medical School University of Crete Greece Institute of Molecular Biology and Biotechnology FORTH Crete Greece Department of Materials Science and Engineering University of Ioannina (UoI) Greece

Motion is one of the most important characteristics in clinical epileptology. In developing an integrated motion analysis system for epileptic patients or children with neurological disorders (e.g. ADHD) we surveyed and analyzed current efforts in vision-based human motion analysis in epilepsy as well as all possible forms of motion typically encountered in known epileptic syndromes. This paper presents the results in a systematic way, and includes a critical discussion of methodological and scientific challenges that need to be addressed in this particular domain.

关键词： Variable speed drives Head Biomedical imaging Cameras Epilepsy Image segmentation Pixel

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Multimedia ICT in vocational training

Multimedia ICT in vocational training

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International Symposium on Electronics in Marine (ELMAR)

作者： Pavol Podhradský Peter Trúchly Tomáš Zeman Jaromír Hrad Faculty of Electrical Engineering and Information Technology of the Slovak University of Technology Department of Telecommunications Bratislava Slovak Republic Faculty of Informatics and Information Technologies of the Slovak University of Technology Institute of Computer Systems and Networks Bratislava Slovak Republic Faculty of Electrical Engineering of the Czech Technical University Department of Telecommunications Prague Czech Republic

The paper presents the main ideas of two Leonardo da Vinci (LdV) projects focused on the vocational training. The selected outputs of these projects are presented in more details. The conception of the multilingual terminological dictionary and proposed graphical user interface is also presented in the paper. An example of practical exercises in the area of NGN protocols based on remote access to NGN Lab is described and illustrated.

关键词： Next generation networking Training Multimedia communication Protocols Servers Dictionaries Least squares approximation

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Friction compensation of an aeroelastic wing — A TP model transformation based approach

Friction compensation of an aeroelastic wing — A TP model t...

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International Symposium on Intelligent Systems and informatics (SISY)

作者： Béla Takarics Patrícia Gróf Péter Baranyi Péter Korondi Department of Mechatronics Optics and Engineering Informatics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary Computer and Automation Research Institute Cognitive Informatics Research Group Budapest Hungary Dep. of Mechatronics Optics and Eng. Informatics Budapest Hungary Dep. of Telecommunications and Media Info. Budapest Univ. of Technology and Economics Budapest Hungary

Various approaches to control aeroelastic wing section with structural nonlinearity emerged in the last years. One of the approaches is based on the Tensor Product (TP) model transformation and the feasibility test of linear matrix inequalities (LMIs) under the Parallel Distributed Compensation framework. The main contribution of this paper is that it extends the previously established qLPV model of the aeroelastic wing section with nonlinear friction. It is proven that the extended model can be exactly described after TP type polytopic decomposition. The qLPV model of the aeroelastic wing section with Coulomb friction was transformed to TP type polytopic model form for which LMI based controller was designed. The designed controller is compared to controllers of other authors dealing with the same problem.

关键词： Friction Mathematical model Force Tensile stress Biological system modeling Numerical models Finite element methods

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RSCTC'2010 Discovery Challenge: Mining DNA microarray data for medical diagnosis and treatment

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7th International Conference on Rough Sets and Current Trends in Computing, RSCTC 2010

作者： Wojnarski, Marcin Janusz, Andrzej Nguyen, Hung Son Bazan, Jan Luo, Chuan Jiang Chen, Ze Hu, Feng Wang, Guoyin Guan, Lihe Luo, Huan Gao, Juan Shen, Yuanxia Nikulin, Vladimir Huang, Tian-Hsiang McLachlan, Geoffrey J. Bošnjak, Matko Gamberger, Dragan TunedIT Solutions Zwirki i Wigury 93/3049 02-089 Warszawa Poland Faculty of Mathematics Informatics and Mechanics University of Warsaw Banacha 2 02-097 Warszawa Poland Institute of Mathematics University of Rzeszow Rejtana 16A 35-959 Rzeszow Poland Institute of Computer Science and Technology Chongqing University of Posts and Telecommunications Chongqing 400065 China Department of Mathematics University of Queensland Australia Institute of Information Management National Cheng Kung University Taiwan Laboratory for Information Systems Rudjer Boskovic Institute Bijenicka 54 10000 Zagreb Croatia

ISBN: (纸本)3642135285

RSCTC'2010 Discovery Challenge was a special event of Rough Sets and Current Trends in Computing conference. The challenge was organized in the form of an interactive on-line competition, at *** platform, in days between Dec 1, 2009 and Feb 28, 2010. The task was related to feature selection in analysis of DNA microarray data and classification of samples for the purpose of medical diagnosis or treatment. Prizes were awarded to the best solutions. This paper describes organization of the competition and the winning solutions. © 2010 Springer-Verlag Berlin Heidelberg.

关键词： computer aided diagnosis

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A ferrite permanent magnet axial gap motor with segmented rotor structure for the next generation hybrid vehicle

A ferrite permanent magnet axial gap motor with segmented ro...

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International Conference on Electrical Machines, ICEM

作者： Takahiko Miura Shinji Chino Masatsugu Takemoto Satoshi Ogasawara Akira Chiba Nobukazu Hoshi Division of Systems Science and Informatics Graduate School of Information Science and Technology Hokkaido University Hokkaido Japan Division of Systems Science and Informatics Graduate SchOol of Information Science and Technology Hokkaido University Hokkaido Japan Department of Electrical & Electronic Engineering Graduate School of Science and Engineering Tokyo Institute of Technology Tokyo Japan Department of Electrical Engineering and Computer Science and Technology Tokyo University of Science Chiba Japan

Permanent magnet synchronous motors (PMSMs) are a key part of the current hybrid electric vehicle (HEV) drive system, and the sophisticated performance such as small size, high power density, and high efficiency is required to the PMSMs in the HEV drive system. Therefore, rare earth permanent magnet is generally employed in the PMSMs in order to satisfy those demands. However, rare earth materials contained in the rare earth permanent magnet have several concerns caused by uneven distribution, because the rare earth materials such as neodymium and dysprosium depend on China for 90% or more of the world share. Accordingly, the rare earth materials have the undeniable possibility of sudden rise of price or reinforcement of export restriction. On the other hand, the HEVs tend to be promoted rapidly because of growing concern about environmental problems. Therefore, it is very important to develop rare-earth-free motors for the next generation HEV drive system. This paper proposes a ferrite permanent magnet axial gap motor without the rare earth materials for the HEVs. In addition, the proposed motor structure and the analytical results with the 3D-FEA are introduced.

关键词： Rotors Ferrites Permanent magnet motors Torque Reluctance motors Permanent magnets Magnetic flux

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An Annealing Approach to Router Nodes Placement Problem in Wireless Mesh Networks

An Annealing Approach to Router Nodes Placement Problem in W...

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

作者： Fatos Xhafa Christian Sanchez Leonard Barolli Rozeta Miho Department of Computer Science and Information Systems Birkbeck University of London London UK Department of Languages and Informatics Systems Technical University of Catalonia Barcelona Spain Department of Information and Communication Engineering Fukuoka Institute of Technology Fukuoka Japan Department of Electronics Technical University of Tirana Tirana Albania

ISBN: (纸本)9781424459179;9780769539676

Mesh router nodes placement is a central problem to Wireless Mesh Networks (WMNs). An efficient placement of mesh router nodes is indispensable for achieving network performance in terms of both network connectivity and user coverage. Unfortunately the problem is computationally hard to solve to optimality even for small deployment areas and a small number of mesh router nodes. As WMNs are becoming an important networking infrastructure for providing cost-efficient broadband wireless connectivity, researchers are paying attention to the resolution of the mesh router placement problem through heuristic approaches in order to achieve near optimal, yet high quality solutions in reasonable time. In this work we propose and evaluate a Simulated Annealing (SA) approach to placement of mesh router nodes in WMNs. The optimization model uses two maximization objectives, namely, the size of the giant component in the network and user coverage. Both objectives are important to deployment of WMNs; the former is crucial to achieve network connectivity while the later is an indicator of the QoS in WMNs. The SA approach distinguishes for its simplicity yet its policy of neighborhood exploration allows to reach promising areas of the solution space where quality solutions could be found. We have experimentally evaluated the SA algorithm through a benchmark of generated instances, varying from small to large size, and capturing different characteristics of WMNs such as topological placements of mesh clients. The experimental results showed the efficiency of the annealing approach for the placement of mesh router nodes in WMNs.

关键词： Wireless mesh networks Simulated annealing Intelligent networks Competitive intelligence Communication system software Software systems computer science Information systems informatics Quality of service

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Two perspectives to investigate the intrinsic organization of the dynamic and ongoing spontaneous brain activity in humans

Two perspectives to investigate the intrinsic organization o...

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International Joint Conference on Neural Networks (IJCNN)

作者： Zhijiang Wang Jiming Liu Ning Zhong Haiyan Zhou Yulin Qin International WIC Institute Beijing University of Technology Beijing P.R. China Department of Computer science Hong Kong Baptist University Kowloon Tong Hong Kong P.R. China Department of Life Science and Informatics Maebashi Institute of Technology Maebashi-City Japan Department of Psychology Beijing University of Technology Beijing P.R. China

Spontaneous brain activity studies have revealed `small-world' property in functional networks based on correlated or positively-correlated relationships. However, studies neither investigated negatively-correlated functional networks, nor checked the `dynamic' properties of the whole functional organization. After subjects performed a specific task, what changes will be caused in the intrinsic organization? In this study, we examined pre-task and post-task resting brains using functional MRI (fMRI). Then we suggested two perspectives with positively-correlated brain functional network (PCBFN) and negatively-correlated brain functional network (NCBFN), by testing whether correlation coefficients were positive or negative. The major findings were: 1) the PCBFN was with small-world architecture but the NCBFN was not, with different motifs, and the PCBFN showed stronger small-world effect at the post-task resting state; 2) Both PCBFN and NCBFN followed an exponentially truncated power law degree distribution. This study may offer a framework to investigate the intrinsic organization of spontaneous brain activity.

关键词： Organizations Humans Brain Correlation Magnetic resonance imaging Information processing Electronic mail

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