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Embedded WiMAX-based vehicular router for Telematics computing

Embedded WiMAX-based vehicular router for Telematics computi...

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International Conference on Advanced Communication Technology (ICACT)

作者： Jiann-Liang Chen Yao-Chung Chang Yu-Shan Lin Hsien-Wen Du Department of Electrical Engineering National Taiwan University Taipei Taiwan Department of Computer Science & Information Engineering National Taitung University Taitung Taiwan Department of Information Science & Management System National Taitung University Taitung Taiwan Department of Computer Science & Information Engineering National Dong Hwa University Hualien Taiwan

This study presents a novel embedded WiMAX-based vehicular router with a network mobility architecture that promotes the telematics services for ubiquitous/pervasive computing (UPC) environment anytime and anywhere. Each telematics user has to process the handoff procedure with the mobile IP mechanism. Therefore, the proposed WiMAX-based vehicular router can process more Telematics users for handoff procedures simultaneously. Network performances in terms of packet loss, round-trip time (RTT) and handoff latency are investigated and analyzed in this study. Compare with the traditional WiFi-based vehicular router, the embedded WiMAX-based vehicular router improves the packet loss about 36% and the average RTT is decreased by approximately 34%. Based on the handoff latency analysis, the embedded WiMAX vehicular router has the superior performance using the mobile network with the embedded router when there are more than two Telematics users.

关键词： WiMAX Telematics Embedded computing

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Multicast Throughput of Hybrid Wireless Networks Under Gaussian Channel Model

Multicast Throughput of Hybrid Wireless Networks Under Gauss...

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IEEE International Conference on Distributed Computing systems

作者： Cheng Wang Shaojie Tang Xiang-Yang Li Changjun Jiang Yunhao Liu Department of Computer Science and Technology Tongji University Shanghai China Department of Computer Science Illinois Institute of Technology Chicago IL 60616 Key Laboratory of Embedded System and Service Computing Ministry of Education Shanghai China Department of Computer Science and Engineering Hong Kong University of Science and Technology

ISBN: (纸本)9781424444816

We study the multicast capacity for hybrid wireless networks consisting of ordinary wireless nodes and base stations under Gaussian Channel model, which generalizes both the unicast capacity and broadcast capacity for hybrid wireless networks. We simply consider the hybrid extended network, where the ordinary wireless nodes are placed in the square region A(n) with side-length n~(1/2) according to a Poisson point process with unit intensity. In addition, m additional base stations (BSs) serving as the relay gateway are placed regularly in the region A(n) and they are connected by a high-bandwidth wired network. Three broad categories of multicast strategies are proposed in this paper. According to the different scenarios in terms of m, n and n_d, we select the optimal scheme from the three categories of strategies, and derive the achievable multicast throughput based on the optimal decision.

关键词： Wireless networks Multicast Gaussian channels point operation BASE STATION HYBRID Hybrid electric vehicles Throughput

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Skill rating by Bayesian inference

Skill rating by Bayesian inference

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IEEE Symposium on Computational Intelligence and Data Mining (CIDM)

作者： Giuseppe Di Fatta Guy McC. Haworth Kenneth W. Regan School of System Engineering University of Reading Reading Berkshire UK Department of Computer Science and Engineering State University of New York Buffalo NY USA

systems engineering often involves computer modelling the behaviour of proposed systems and their components. Where a component is human, fallibility must be modelled by a stochastic agent. The identification of a model of decision-making over quantifiable options is investigated using the game-domain of Chess. Bayesian methods are used to infer the distribution of players' skill levels from the moves they play rather than from their competitive results. The approach is used on large sets of games by players across a broad FIDE Elo range, and is in principle applicable to any scenario where high-value decisions are being made under pressure.

关键词： Bayesian methods Humans Game theory Decision making Engines Stochastic processes Psychology systems engineering and theory Problem-solving Pattern recognition

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Dynamic screen division for load balancing the raycasting of irregular data

Dynamic screen division for load balancing the raycasting of...

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IEEE International Conference on Cluster Computing

作者： Bernardo B. Labronici Cristiana Bentest Lucia Maria A. Drummond Ricardo Farias Computer Science Department Federal Fluminense University Niterói RJ Brazil Department of System Engineering State University of Rio de Janeiro Rio de Janeiro RJ Brazil System Engineering and Computer Science Program-COPPE Centro de Tecnologia Rio de Janeiro RJ Brazil

Parallel rendering algorithms usually suffer from high load imbalance during execution, due to the irregular nature of the datasets. In this paper, we propose a new load balancing scheme for tile-based parallel rendering that includes strategies for load estimation, tile decomposition and tile assignment. The load estimation strategy computes the rendering cost for each pixel, and uses it as a prediction for the next frame. The tile decomposition strategy adaptively divides the screen into tiles based on the computed costs, until an evenly tile partition is achieved. The tile assignment strategy distributes the tiles among rendering processors, based on a 2-optimal scheduling. Experimental results show that our scheme achieves significant performance gains by reducing the load imbalance when compared to the traditional tile subdivision and static random distribution schemes.

关键词： Load management Tiles Rendering (computer graphics) Concurrent computing Parallel processing computer science Costs Data visualization Data engineering systems engineering and theory

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Charge trapping and current conduction mechanisms of advanced metal-oxide-semiconductor capacitors with LaxTay dual-doped HfON dielectrics

Charge trapping and current conduction mechanisms of advance...

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International Symposium Semiconductor Device Research (ISDRS)

作者： Chin-Lung Cheng Jeng-Haur Horng Kuei-Shu Chang-Liao Jin-Tsong Jeng Hung-Yung Tsai Institute of Mechanical and Electro-Mechanical Engineering National Formosa University Taiwan Department of Engineering and System Science National Tsing Hua University Taiwan Department of Computer Science and Information Engineering National Formosa University Taiwan

In summary, the improved characteristics in terms of EOT, D;t, SILC, and trap energy level are demonstrated by developing proper La¿Ta¿ doping into HfON dielectrics.

关键词： MOS capacitors Dielectric devices Educational institutions Hafnium Radio frequency Rapid thermal annealing Energy states systems engineering and theory computer science High K dielectric materials

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Scalable Multi-Hop Scheduling with Overlapping the Tuning Latency in WDM Optical Star Networks

Scalable Multi-Hop Scheduling with Overlapping the Tuning La...

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IEEE International Conference on Parallel and Distributed Computing, Applications and Technologies (PDCAT)

作者： SingLing Lee JungChun Liu Hann-Jang Ho Department of Computer Science and Information Engineering National Chung Cheng University Chiayi Taiwan Department of Management Information System Far East University Tainan County Taiwan Department of Computer Science and Information Engineering Wu Feng Institute of Technology Chiayi Taiwan

For the current technique, the tuning latency ¿ on each transmitter is more than the packet transmission time, and it cannot be ignored in packet scheduling. So in order to reduce the serious affection of tuning operations, we propose the multi-hop model for the All-to-All Broadcast (AAB) problem in WDM optical star networks with N nodes and w available wavelengths, which the number of hop distance for packet transmissions is limited to a constant ¿. Our strategy can overlap the tuning latency in multi-hop scheduling, and reduce the number of tuning operations on each transmitter to 2¿(w - 1)/¿¿. If ¿ can be completely covered in scheduling, the schedule length is k(k - 1) + ¿ + 2¿(w-1)/¿¿[k 2 ¿(¿+1)/2] time slots, where k = N/w. Otherwise, it is k(k - 1) + ¿ + 2¿(w-1)/¿¿[k¿(¿+1)/2 + ¿] slots. Our proposed method is very suitable for the scalable WDM networks if the number of wavelength is fixed, and its multi-hop schedule length is shorter than that of other scheduling approaches if k is small or ¿ is larger.

关键词： Spread spectrum communication Optical tuning Delay Wavelength division multiplexing WDM networks Optical fiber networks Optical transmitters Scheduling algorithm Optical receivers Broadcasting

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Improvement of Multi-hop Packet Transmission Scheduling in WDM Optical Star Networks

Improvement of Multi-hop Packet Transmission Scheduling in W...

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International Symposium on Parallel Architectures, Algorithms and Networks (ISPAN)

作者： Hann-Jang Ho JungChun Liu SingLing Lee Department of Computer Science and Information Engineering Wu Feng Institute of Technology Chiayi Taiwan Department of Management Information System Far East University Tainan County Taiwan Department of Computer Science and Information Engineering National Chung Cheng University Chiayi Taiwan

This paper addresses the design of multi-hop packet transmissions for the All-to-All Broadcast (AAB) problem in a Wavelength Division Multiplexing (WDM) optical star network. To decrease the optical-electronic-optical (O/E/O)transformations in multi-hop scheduling, the maximum of hop distances of each packet transmission is limited to a constant. Each node consists of a tunable transmitter and a fixed-tuned receiver (TT-FR configuration), and each tunable transmitter needs a non-negligible tuning latency to switch between different wavelengths. To decrease the influence of the tuning latency in multi-hop scheduling and the time of tuning operations on each transmitter, we adopt simpler methods for constructing less logical topologies when all tunable transmitters change their transmitted wavelengths to other channels in scheduling concurrently. Our multi-hop scheduling has not only a shorter schedule period but also a less number of transmitted wavelengths used.

关键词： Spread spectrum communication Wavelength division multiplexing WDM networks Optical fiber networks Optical transmitters Optical receivers Delay Optical design Broadcasting Optical tuning

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Reputation Cascade Model over Social Connections in Online Social Networks

Reputation Cascade Model over Social Connections in Online S...

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IEEE WIC ACM International Conference on Web Intelligence (WI)

作者： Maziar Gomrokchi Jamal Bentahar Babak Khosravifar Department of Computer Science Concordia University Montreal Canada Concordia Ins. of Information System Engineering Concordia University Montreal Canada

Reputation is turning to be one of the most important concerns in online social networks. Users in such environments extend their activity area with respect to the possible updates on their reputation level. In this paper, we propose a probabilistic model of reputation cascade through the network. This model helps users to select the best possible choice of interaction. Furthermore, we also provide a game theoretic approach to analyze the model.

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Genetic Algorithm for optimizing cutting conditions of uncoated carbide (WC-Co) in milling machining operation

Genetic Algorithm for optimizing cutting conditions of uncoa...

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IEEE Conference on Innovative Technologies in Intelligent systems and Industrial Applications (CITISIA)

作者： Azlan Mohd Zain Habibollah Haron Safian Sharif Faculty of Computer Science & Information System Universiti Teknologi Malaysia Skudai Johor Malaysia Department of Modeling & Industrial Computing Faculty of Computer Science & Information System Universiti Teknologi Malaysia Skudai Johor Malaysia Department of Manufacturing & Industrial Engineering Faculty of Mechanical Engineering Universiti Teknologi Malaysia Skudai Johor Malaysia

This paper presents the capability of genetic algorithm (GA) technique in obtaining the optimal machining parameters for uncoated carbide (WC-Co) tool to minimize the surface roughness (R a ) value in milling process. The optimal machining parameters are generated using MATLAB optimization toolbox. Regression technique is applied to create the surface roughness predicted equation to be taken as a fitness function of the GA. Result of this study indicated that the GA technique capable to estimate the optimal cutting conditions that yields to the minimum R a value. With high speed, low feed and high radial rake angle of the cutting conditions rate, GA technique recommended 0.17533 mum as the best minimum predicted surface roughness value. Consequently, the GA technique has decreased the minimum surface roughness value of the experimental data by about 25.7%.

关键词： Genetic algorithms Metalworking machines Rough surfaces Surface roughness Machining Milling MATLAB Equations Yield estimation Feeds

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A Metrics Suite for Measuring Reusability of Learning Objects

A Metrics Suite for Measuring Reusability of Learning Object...

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International Conference on Intelligent systems Design and Applications (ISDA)

作者： Siti Fadzilah Mat Noor Norazah Yusof Siti Zaiton Mohd Hashim Department of Information Science Faculty of Information Science and Technology Universiti Kebangsaan Malaysia Bangi Malaysia Department of Software Engineering Faculty of Computer Science & Information System Universiti Teknologi Malaysia Skudai Malaysia

Learning Object (LO) is one of the main research topics in the E-Learning community in the recent years, and most researchers pay attention to the issue of Learning Object Reusability. The most obvious motivation is the economic interest of reusing learning material instead of repeatedly authoring it. Reusability requires the LO to be in a fine-grain form because raw media elements are often much easier to reuse than aggregate assemblies. In other words, as the LO size decreases (lower granularity), its potential for reuse increases. Therefore, when designing learning objects, reusability must be considered as a key consideration. This paper shows how we adapted and applied some of the metrics from the software engineering field for the purpose of measuring reusability of learning objects.

关键词： Software engineering Software measurement Electronic learning Information science Aggregates Assembly Animation Intelligent systems Application software computer science

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