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International Vacuum Electron Sources Conference, IVESC

作者： R. K. Barik M. S. Bisht R. S. Raju G.-S. Park Central Electronics Engineering Research Institute (CEERI) Pilani (Raj.) INDIA School of Electrical Engineering and Computer Science Seoul National University South Korea School of Electrical Engineering and Computer Science Seoul National University and Center for THz-Bio Application Systems South Korea

A high-current-density, long life and uniform emission cathode is a key requirement for a THz-VED. Using a new synthesis approach Sc 2 O 3 doped W-nanoparticles were made to fabricate cathode, which is believed to play a dominant role for above application. The fabrication details along with the emission results will be presented.

关键词： Cathodes Shape Temperature measurement Current density Educational institutions Tungsten Nanoparticles

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Energy optimization for wireless sensor networks using a novel dynamic multicast routing protocol

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Research Journal of Applied sciences, engineering and Technology 2014年第3期8卷 305-311页

作者： Senthil Kumar, M. Chaturvedi, Ashish Department of Computer Science and Engineering Monad University Hapur Utter Pradesh India Arni School of Computer Science and Application Arni University Indora (Kathgarh) Himachal Pradesh India

Minimization of energy consumption has always been the predominant factor deciding the acceptability of a routing protocol for wireless ad-hoc networks. In this study we have proposed a novel efficient multicast routing protocols in wireless mobile ad hoc networks is proposed. Due to the high mobility of nodes and highly dynamic topology, performing efficient and robust multicast in a Mobile Ad hoc Network (MANET) is a challenging task. Most of existing multicast protocols in MANETs discover the routing path by flooding message over the whole network, which result in considerable cost for routing discovery and maintenance. Moreover, the reliability of the discovered path cannot be guaranteed, since the stabilities of nodes along such path are unpredictable. Here an attempt is made to devise an algorithm combining the features of both energy efficient and low latency algorithms. The new algorithm is intended to do well in real-world scenarios where the energy capacities of the nodes are not uniform. It employs a mobility prediction based election process to construct a reliable backbone structure performing packet transmission, message flooding, routing discovery and maintenance. Several virtual architectures are used in the protocol without need of maintaining state information for more robust and scalable membership management and packet forwarding in the presence of high network dynamics due to unstable wireless channels and node movements. © Maxwell Scientific Organization, 2014.

关键词： Load balancing Low latency Multipath routing Scalability Wireless ad-hoc networks

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A Security Enhanced IEEE1588 Protocol for Deep-Space Environment

A Security Enhanced IEEE1588 Protocol for Deep-Space Environ...

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International Conference on P2P, Parallel, Grid, Cloud and Internet Computing (3PGCIC)

作者： Zijing Cheng Lei He Jingling Zhao Kai Lin Baojiang Cui The Academy of Satellite Application Beijing School of Computer Science Beijing University of Posts and Telecommunication Beijing National Engineering Laboratory for Mobile Network Security Beijing

ISBN: (纸本)9781479978724

With the continuous development of the space technology, increasing communication between spacecrafts. To ensure the spacecrafts keep a uniform time standard, time synchronization protocol plays an crucial role. Taking account the characteristics of deep-space: poor link quality, limited node computing power, and the GNSS service is unstable, through the improving of IEEE1588 protocol, a autonomous time synchronization protocol for the space environment is presented, which security arrangement is relatively sound, does not depend on the GNSS service - Security Enhanced IEEE1588 for Space (SEIEEE1588).

关键词： Synchronization Clocks Protocols Cryptography Authentication Accuracy

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Multiagent reinforcement learning dynamic spectrum access in cognitive radios

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Sensors and Transducers 2014年第2期164卷 170-175页

作者： Chun, Wu Mingyong, Yin Shaoliang, Ma Hong, Jiang School of National Defense Technology Southwest University of Science and Technology Mianyang 621000 Sichuan China Institute of Computer Application China Academy of Engineering Physics Mianyang 621900 Sichuan China

A multiuser independent Q-learning method which does not need information interaction is proposed for multiuser dynamic spectrum accessing in cognitive radios. The method adopts self-learning paradigm, in which each CR user performs reinforcement learning only through observing individual performance reward without spending communication resource on information interaction with others. The reward is defined suitably to present channel quality and channel conflict status. The learning strategy of sufficient exploration, preference for good channel, and punishment for channel conflict is designed to implement multiuser dynamic spectrum accessing. In two users two channels scenario, a fast learning algorithm is proposed and the convergence to maximal whole reward is proved. The simulation results show that, with the proposed method, the CR system can obtain convergence of Nash equilibrium with large probability and achieve great performance of whole reward. © 2014 IFSA Publishing, S. L.

关键词： Cognitive radio

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Research on illumination invariance colour index algorithm based on colour ratio

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computer Modelling and New Technologies 2014年第6期18卷 360-364页

作者： Cai, Fei Wang, Wenjun School of Computer Science and Technology Tianjin University Tianjin China Tianjin Key Laboratory of Cognitive Computing and Application Tianjin China School of Civil Engineering Shandong Jianzhu University Jinan China

Statistics of colour value of each pixel in the image are output in traditional colour histograms. Therefore, though the two same images photographed in different illuminations are consistent in colour content, they have different colour distributions in the histograms. To solve the problem, this paper introduces an illumination invariance colour index algorithm based on colour ratio. According to the colour constancy theory, although colour values of its pixels will be changed once the image is subject to illumination, colour ratios remain unchanged. Colour ratio refers to the ratio between two contiguous pixels. As per colour ratios, colour ratio image may be obtained, which depicts obvious boundaries or margins of the image content so that we statistics of colour ratio histogram can be obtained as an index mechanism to remove illumination effect. Verified by lots of tests, this method can extract useful colour characteristics and remove illumination effect, so that it can be practically used in effective computer recognition of objects in traffic videos.

关键词： Pixels

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SSD lifespan-oriented cache optimization in SSD/HDD hybrid storage system

SSD lifespan-oriented cache optimization in SSD/HDD hybrid s...

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2014 International Conference on Environmental engineering and computer application (ICEECA 2014)

作者： X.Wang Q.X.Zhang Y.A.Tan J.Q.Qu Beijing Engineering Research Center of Massive Language Information Processing and Cloud Computing Application School of Computer Science and Technology Beijing Institute of Technology Shanghai Radio Equipment Research Institute

Layered SSD/HDD hybrid storage system has been widely used. However, most traditional designs are performance oriented, and not optimized for SSD lifespan. In this paper, SSD lifespan oriented layered model and cache algorithm are proposed. To decrease SSD wear rate, HDD-RAM switch tunnel is appended to the traditional layered hybrid structure. Cache window size is considered in cache algorithm to filter data, avoiding unnecessary cache cost. Results show optimized designs significantly reduced erase times on SSD, and slightly influenced original performance.

关键词： SSD lifespan-oriented cache optimization in SSD/HDD hybrid storage system HDD RAM cache

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Using Kuliback-Leibler divergence to model opponents in poker 28

Using Kuliback-Leibler divergence to model opponents in poke...

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28th AAAI Conference on Artificial Intelligence, AAAI 2014

作者： Zhang, Jiajia Wang, Xuan Yao, Lin Li, Jingpeng Shen, Xuedong Intelligence Computing Research Center Harbin Institute of Technology Shenzhen Applied Technology Engineering Laboratory for Internet Multimedia Application China Intelligence Computing Research Center Harbin Institute of Technology Public Service Platform of Mobile Internet Application Security Industry China School of Electronics Engineering and Computer Science Peking University China C302 HIT Campus Shenzhen University Town NanShan District XiLi Shenzhen518055 China IER Building Soutn Area Shenzhen High-Tech Industrial Park Shenzhen518055 China

ISBN: (纸本)9781577356653

Opponent modeling is an essential approach for building competitive computer agents in imperfect information games. This paper presents a novel approach to develop opp onent modeling techniques. The approach applies neural networks which are separately trained on different datasct to build K- model clustering opponent models. KullbackL eibler (KL) divergence is used to exploit a safety mode on opponent modeling. Given a parameter d that controls the max divergence between a model's centre point and the units belong to it, the approach is proved to provide a lower bound of expected payoff which is above the minimax payo ff for correctly clustered players. Even for the players that are incorrectly clustered, the lower bound can also be unlimi ted approximated with sufficient history data, In our experi ments, agent with the novel model shows an improved class ification efficiency of opponent modeling comparing with relative researches. And also, the new agent performs better when playing against poker agent HITSZ-CS-13 which participate Annual computer Poker Competition of 2013. © Copyright 2014. Association for the Advancement of Artificial Intelligence (***). All rights reserved.

关键词： computer games

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An unsupervised model for classification and recognition of household appliances

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Journal of Computational Information Systems 2014年第1期10卷 403-410页

作者： Liu, Li Ding, Jiaman Zhong, Jiayu Fu, Xiaodong Lv, Yang Yunnan Provincial Key Laboratory of Computer Technology Application Faculty of Information Engineering and Automation Kunming University of Science and Technology Kunming 650500 China State-Province Joint Laboratory of Digital Home Interactive Applications School of Information Science and Technology Sun Yat-Sen University Guangzhou 510006 China

Detecting and monitoring the numerous household appliances in smart home is significant for home energy management, because the large various household appliances are complicated to identify and control. This paper proposes an intelligent unsupervised model for the classification and recognition of household appliances. The key idea in this work is to integrate appliance and activity recognition mechanism for effective management and operation within a domestic location. We first present the corresponding classification list of household appliances w. r. t their respective usage patterns and basic power factors. Then, the communication services among various appliances are established to recognize complex appliances and monitor the variation of their states. Finally, the proposed method is applicable for an inexpensive, unsupervised controlling of electrical appliances in a real-time way. Experimental results show that our method effectively provides a financially viable and easily applicable solution for gathering information and monitoring status of diverse household appliances. Copyright © 2014 Binary Information Press.

关键词： Domestic appliances

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SLA aware cost efficient virtual machines placement in cloud computing

SLA aware cost efficient virtual machines placement in cloud...

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IEEE International Conference on Performance, Computing and Communications (IPCCC)

作者： Jiangtao Zhang Zhixiang He Hejiao Huang Xuan Wang Chonglin Gu Lingmin Zhang School of Computer Science and Technology Harbin Institute of Technology Shenzhen Graduate School Shenzhen China Public Service Platform of Mobile Internet Application Security Industry Shenzhen China Shenzhen Key Laboratory of Internet of Information Collaboration Shenzhen China Shenzhen Applied Technology Engineering Laboratory for Internet Multimedia Application Shenzhen China

ISBN: (纸本)9781479975761

Servers and network contribute about 60% to the total cost of data center in cloud computing. How to efficiently place virtual machines so that the cost can be saved as much as possible, while guaranteeing the quality of service plays a critical role in enhancing the competitiveness of service cloud provider. Considering the heterogeneous servers and the random property of multiple resources requirements of virtual machines, the problem is formulated as a multi-objective nonlinear programming in this paper. Virtual machine cluster with higher traffic is made staying together. This reduces the communication delay while saving the inter-server bandwidth consumption, especially the relatively scarce higher level bandwidth, by exploiting the topology information of data center. At the same time, statistic multiplex and newly defined “similarity” techniques are leveraged to consolidate virtual machines. The violation of resource capacity is kept at any designated minimal probability. Thus the quality of service will not be deteriorated while saving servers and network cost. An offline and an online algorithms are proposed to address this problem. Experiments compared with several baseline algorithms show the validity of the new algorithms: more cost is cut down at less computation effort.

关键词： Bandwidth Servers Cloud computing Topology Multiplexing Correlation Clustering algorithms

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Synthesized algorithms of concept similarity based on the semantic correlation prerequisite

Synthesized algorithms of concept similarity based on the se...

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8th International Conference on Bio-Inspired Computing: Theories and applications, BIC-TA 2013

作者： Liu, Hui-Lin Liu, Qing School of Computer Science and Engineering Anhui University and Technology Huainan232001 China Jiangxi Application Engineering Vocational Institute Pingxiang337042 China

ISBN: (纸本)9783642375019

This paper offers a synthesized approach of solving the shortage of the traditional similarity in ontology mapping. First, it selects high correlation concepts by Hirst-St-Onge semantic relativity algorithms, in order to reduce the complexity of the account. Then according to the characteristic of the ontology concept, we designs a synthesized method through calculating the respective similarity in name, attribute and instance of concepts, and works out weight by Sigmoid function. Experiment data indicates that it makes the better accuracy than the traditional methods. © Springer-Verlag Berlin Heidelberg 2013.

关键词： Semantics

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