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Experimental study on the effects of communication range on cooperative robotic search in complex environments

Experimental study on the effects of communication range on ...

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2009 2nd International Conference on Robot Communication and Coordination, RoboComm 2009

作者： Çaylrpunar, Ömer Gazi, Veysel Tavli, Bulent Cervera, Enric Witkowski, Ulf Penders, Jacques Dept. of Computer Engineering TOBB University of Economics and Technology Sögütözü Cad. No: 43 06560 Ankara Turkey Dept. of Electrical and Electronics Engineering TOBB University of Economics and Technology Sögütözü Cad. No: 43 06560 Ankara Turkey Dept. of Computer Science and Engineering Jaume-I University Campus Riu Sec 12071 Castelló Spain Heinz Nixdorf Institute University of Paderborn Fuerstenallee 1133102 Paderborn Germany Microsystems and Machine Vision Lab Sheffield Hallam University Pond Street Sheffield SI lWB United Kingdom

ISBN: (纸本)9789639799516

Communication has an important role in multirobot systems. It can facilitate cooperation, therefore, improve the performance of the system significantly. In this study we investigated the benefits of networked communication by experimentally evaluating the results of two search algorithms which are spiral search and informed random search. The experiments were performed in an experimental area containing obstacles and using e-puck robots where the communication ranges were "simulated" with the help of an overhead camera. Each robot was allowed to (i) keep an occupancy grid based local map of the environment containing also information about the cells it has visited and (ii) exchange this information with the other robots within its communication range. The effect of the size of communication range on the performance of the system defined as the time of completion of the search task (i.e, locating the target), was investigated.

关键词： Cooperative communication

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A secure ubiquitous sensor network with Dragon 09

A secure ubiquitous sensor network with Dragon

引用

International Conference on Convergence and Hybrid Information Technology 2009, ICHIT 2009

作者： Kumar, Pardeep Lee, Hoon Jae Chung, Wan-Young Dept. Ubiquitous IT Graduate School of Design and IT Dongseo University Busan 617716 Korea Republic of Division of Information Network Eng. School of Internet Engineering Dongseo University Busan 617716 Korea Republic of Division of Electronics Computer and Telecommunication Engineering Pukyong National University Busan Korea Republic of

ISBN: (纸本)9781605586625

The creation of wireless sensor networks provides a capable solution for a range of ubiquitous information services. Its challenges like, data security and secrecy due to its hostile deployment nature of being flat to physical attacks with restricted source available. In order to competition the security pressure that sensor networks are exposed to, a cryptography algorithm is implemented at sensor nodes for node-to-node encryption, between nodes considering the data redundancy, energy constraint, and security requirement. In this paper, we analyze Dragon stream cipher and propose a new D-MAC secure data scheme which supports node-to-node encryption using Dragon based-privacy [3] for sensor networks. Our procedure regarded the entity verification and message authentication through the performance of authenticated encryption scheme in wireless sensor nodes. © 2009 ACM.

关键词： Cryptography

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The information diffusion model in the blog world

The information diffusion model in the blog world

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3rd Workshop on Social Network Mining and Analysis, SNA-KDD '09

作者： Kwon, Yong-Suk Kim, Sang-Wook Park, Sunju Lim, Seung-Hwan Lee, Jae Bum Dept. of Electronics and Computer Engineering Hanyang University Seoul 133-791 Korea Republic of School of Business Yonsei University Seoul 120-749 Korea Republic of NHN Corp. Seongnam 266-1 Korea Republic of

ISBN: (纸本)9781605586762

In the blog network, the posts in a blog can be diffused to other blogs through trackbacks and scraps. Analyzing information diffusion in the blog network is an important research issue that can be used for predicting information diffusion, detecting abnormality, marketing, and revitalizing the blog world. Existing studies on information diffusion in a blog network define explicit relationships between blogs and analyze the word-of-mouth effect through such explicit relationships only. However, it has been observed that more than 85% of all information diffusion in a blog network occurs through non-explicit relationships. In this paper, we propose a new model that considers both the explicit and non-explicit relationships between blogs in order to explain the information diffusion phenomena in a blog network. We add a super node and the relationships between the super node and blogs as broadcast edges and register edges to the existing information diffusion model and assign the assimilation probability to every relationship. The expanded information diffusion model improves the accuracy of the basic model by taking into account the degrees of diffusion powers of posts. We verify the superiority of the proposed model through extensive experiments of information diffusion at a real blog network. The experimental results show that our expanded information diffusion model generates 77% less errors than the existing model. Copyright 2009 ACM.

关键词： Data mining

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Determining content power users in a blog network

Determining content power users in a blog network

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3rd Workshop on Social Network Mining and Analysis, SNA-KDD '09

作者： Lim, Seung-Hwan Kim, Sang-Wook Park, Sunju Lee, Joon Ho Dept. of Electronics and Computer Engineering Hanyang University Seoul 133-791 Korea Republic of School of Business Yonsei University Seoul 120-749 Korea Republic of NHN Corp. Seongnam 266-1 Korea Republic of

ISBN: (纸本)9781605586762

In a blog network, there are special users who induce other users to actively utilize blog services. In this paper, these users whose contents exhibit large influence over other users are defined as Content Power Users (CPUs). Accurately determining who content power users are in a blog network is important in order to establish an effective business policy that stimulates usage of blog services. In this paper, we propose a new method of determining content power users. First, we measure the influence of each document owned by individual users. Since the influence of a document tends to be high with long exposure, we adjust the value of influence of a document based on exposure duration. Then, by adding up the values of influence of all the documents owned by each user, we calculate the influence of the corresponding user. We analyze the performance of our method, by applying the proposed method to an actual blog network and comparing its results to those of preexisting methods for determining power users. The experimental results demonstrate that our method is well suited for the dynamic nature of the blog network. Copyright 2009 ACM.

关键词： Data mining

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A New Method to Generate Attack Graphs

A New Method to Generate Attack Graphs

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2009 Third IEEE International Conference on Secure Integration and Reliability Improvement SSIRI 2009(第三届IEEE安全软件集成及可信性改进国际会议)

作者： Anming Xie Guodong Chen Yonggang Wang Zhong Chen Jianbin Hu Institute of Software School of Electronics Engineering and Computer Science Peking University Be Dept. Of Electronic Engineering The First Aeronautical College of Air Force China Institute of Software School of Electronics Engineering and Computer Science Peking University Be Institute of Software School of Electronics Engineering and Computer Science Peking University Be Institute of Software School of Electronics Engineering and Computer Science Peking University Be

ISBN: (纸本)9780769537580

To address the scalability problem in attack graphs generation, we propose a novel method to generate attack graphs automatically. Our approach constructs a two-tier attack graph framework, which includes a host access graph and some sub-attack graphs. A subattack graph describes concrete attack scenarios from one source host to one target host, while the host access graph describes the attacker's privilege transition among hosts. Our sub-attack graphs and host access graph have remarkable smaller scales and can help network administrators to find the key hosts in attack sequences. Analysis shows that the upper bound computational cost of our model is O(N3), which could also be competed in real time. The following experiment validates our approach.

关键词： network security attack graphs host access graph sub-attack graph

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A new data gathering algorithm based on mutual supportability and grey prediction in wireless sensor networks

A new data gathering algorithm based on mutual supportabilit...

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NCM 2009 - 5th International Joint Conference on Int. Conf. on Networked Computing, Int. Conf. on Advanced Information Management and Service, and Int. Conf. on Digital Content, Multimedia Technology and its Applications

作者： Min, Xiang Ping, Wang Zhiyong, Luo Young, Han Kim Yan, Jin Ministry of Education Chongqing 400065 China School of Electronics Soongsil Univesity Dongjak-Gu Seoul 156-743 Korea Republic of Dept. of Computer Science and Engineering Konkuk University Gwangjin-gu Seoul 143-701 Korea Republic of

ISBN: (纸本)9780769537696

The energy of node in Wireless Sensor Networks (WSN) is severely constrained, it is very important to maximize the network lifetime by reducing the data dissemination among the nodes. In order to enhance energy efficiency and prolong the system lifetime, a novel data gathering algorithm based on mutual supportability and grey prediction is presented. According to of nodes' the historical data, cluster heads make the decision which nodes are redundant, and then predict some data of these redundant nodes. In order to improve precision of the fused data, the mutual supportability of nodes and the parameter of the grey mode must be modified periodically. With the data gathering algorithm, the frequency of data gathering and energy consumption in intra-cluster could be reduced. The simulation results demonstrate that the data gathering algorithm is effective, and the system lifetime is prolonged. © 2009 IEEE.

关键词： Energy efficiency

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Analog layout synthesis - Recent advances in topological approaches

Analog layout synthesis - Recent advances in topological app...

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2009 Design, Automation and Test in Europe Conference and Exhibition, DATE '09

作者： Graeb, H. Balasa, F. Castro-Lopez, R. Chang, Y.-W. Fernandez, F.V. Lin, P.-H. Strasser, M. Dept. of Computer Science and Information Systems Southern Utah University United States Institute of Microelectronics of Sevilla CSIC University of Sevilla Spain Graduate Institute of Electronics Engineering National Taiwan University Taiwan Institute for EDA Technische Universitaet Muenchen Germany

ISBN: (纸本)9783981080155

This paper gives an overview of some recent advances in topological approaches to analog layout synthesis and in layout-aware analog sizing. The core issue in these approaches is the modeling of layout constraints for an efficient exploration process. This includes fast checking of constraint compliance, reducing the search space, and quickly relating topological encodings to placements. Sequence-pairs, B*-trees, circuit hierarchy and layout templates are described as advantageous means to tackle these tasks. © 2009 EDAA.

关键词： Topology

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Semantic analytical reports: A framework for post-processing data mining results

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18th International Symposium on Methodologies for Intelligent Systems, ISMIS 2009

作者： Kliegr, Tomáš Ralbovský, Martin Svátek, Vojtech Šimunek, Milan Jirkovský, Vojtech Nemrava, Jan Zemánek, Jan University of Economics Prague Faculty of Informatics and Statistics Nám. Winstona Churchilla 4 130 67 Praha 3 Czech Republic Czech Technical University Dept. of Computer Science and Engineering Karlovo nam. 13 121 35 Praha 2 Czech Republic

ISBN: (纸本)3642041248

Intelligent post-processing of data mining results can provide valuable knowledge. In this paper we present the first systematic solution to post-processing that is based on semantic web technologies. The framework input is constituted by PMML and description of background knowledge. Using the Topic Maps formalism, a generic Data Mining ontology and Association Rule Mining ontology were designed. Through combination of a content management system and a semantic knowledge base, the analyst can enter new pieces of information or interlink existing ones. The information is accessible either via semi-automatically authored textual analytical reports or via semantic querying. A prototype implementation of the framework for generalized association rules is demonstrated on the PKDD'99 Financial Data Set. © 2009 Springer Berlin Heidelberg.

关键词： Data mining

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A novel modification of ARX to generalize crude oil consumption model

A novel modification of ARX to generalize crude oil consumpt...

引用

IEEE Region 10 International Conference TENCON

作者： Iwan Awaludin Rosdiazli Ibrahim K. S. Rama Rao Electrical and Electronics Eng. Dept UTP Malaysia/Computer Eng. Dept. POLBAN Indonesia Electrical and Electronics Engineering Department UTP Malaysia

A general model of oil consumption is investigated in this study. This model should be applicable to different countries even with different characteristics. Conventional model that works very well for Malaysia is tested with seven developing Asian countries: China, India, Indonesia, Malaysia, Pakistan, Philippines, and Thailand. The results have shown that this model can not produce a good fit to original data. A modification of Autoregressive Exogenous (ARX) model is proposed and tested. Data are separated into training and validation dataset where the number of validation dataset is higher than the number of training dataset. The results have shown that the proposed model can be considered as a general model where all countries except Philippines can produce a good fit to original data.

关键词： Petroleum Predictive models Energy consumption Artificial neural networks Testing Gallium nitride Mathematical model Extrapolation Root mean square Decision making

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Two- and three-dimensional studies of a silicon-based chromatic dispersion compensator

Two- and three-dimensional studies of a silicon-based chroma...

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2009 Asia Communications and Photonics Conference and Exhibition, ACP 2009

作者： Png, C.E. Lim, S.T. Li, E.P. Danner, A.J. Ogawa, K. Tan, Y.T. Advanced Electromagnetics and Photonics Group IHPC A Star 1 Science Park Road #01-01 Singapore 117528 Singapore Dept. of Electrical and Computer Engineering National University of Singapore 4 Engineering Drive 3 Singapore 117576 Singapore Optics and Electronics Laboratory Fujikura Ltd. 1440 Mutsuzaki Sakura Chiba 285-8550 Japan

ISBN: (纸本)9781557528773

We demonstrate two- and full three-dimensional simulation of an active silicon-based photonic crystal chromatic dispersion compensator with low power consumption of 114nW and functioning at 40.5MHz. The novel device allows waveguiding and electrical transport to be individually tailored to a large extent. ©2009 Optical Society of America.

关键词： Silicon photonics

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