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computer Software 2011年第2期28卷 129-139页

作者： Ohta, Masayuki Sugimoto, Shu Sugawara, Toshiharu Fukuda, Kensuke Hirotsu, Toshio Akashi, Osamu Dept. of Computer Science and Engineering Waseda University Japan National Institute of Informatics PRESTO JST Japan Faculty of Computer and Information Sciences Hosei University Japan NTT Network Innovation Labs Japan

In this paper, we show the possibility of predicting the anomalous packets' behaviors to the near active addresses from small observation address space (Darknet) in Internet. We have proposed the distributed cooperative monitoring architecture (DCMA) which probes the anomalous packets that arrive at the distributed unused address segments and detects and defenses anomalous packets' behaviors to the near active addresses. To realize DCMA, it is necessary to investigate the time-series correlation between anomalous packets arriving at small observation address segments and those of near addresses. Thus, we calculated the correlation strength of anomalous packets that scan address segments from the pairs of the sub-observation address segments divided from the Darknet addresses. Furthermore, we observed the correlation strength when changing the sub-observation's size and investigated the size dependency of the correlation strength. As a result, we could indicate the possibility of predicting the anomalous packets' behaviors to the near address segments from small sub-observation addresses. We could also find that the base observation fixed to the specific sub-observation space contributes to the strong correlation coefficient. Therefore, these results imply that DCMA can predict the anomalous packets' behaviors to the near addresses using small observation space.

关键词： Time series

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A dual-band printed diversity antenna for UMTS and 2.4/5.2-GHz WLAN application

A dual-band printed diversity antenna for UMTS and 2.4/5.2-G...

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2011 Global Mobile Congress, GMC 2011

作者： Guo, Teng Shen, Dongya Zhu, Shihong Zhang, Xiupu Li, Shaojie School of Information Science and Engineering Yunnan University Kunming 650091 China State Key Lab. of Millimeter Waves Nanjing 210096 China Dept. of Electrical and Computer Eng. University of Concordia Montreal QC Canada China Unicom Group Yunnan Branch Kunming 650091 China

ISBN: (纸本)9781467303460

A dual-band printed diversity antenna for UMTS and 2.4/5.2-GHz WLAN operation is proposed. The antenna consists of two back-to-back F-shaped monopoles placed symmetrically with respect to a protruding T-shaped ground plane. Across the two bands, the antenna has two highly decoupled ports and can provide pattern diversity to combat multipath fading. © 2011 IEEE.

关键词： Antenna grounds

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Portality - The portal between virtuality and reality

Portality - The portal between virtuality and reality

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Defense science Research Conference and Expo (DSR)

作者： Jiung-Yao Huang Adrian David Cheok Shu-Shen Wai Chung-Hsien Tsai Shin-Yo Lin Dept. of Computer Science Information Engineering National Taipei University San Shia SinBei City Taiwan Mixed Reality Laboratory National University of Singapore Singapore Dept. of Information Management Chinese Naval Academy Kaohsiung City Taiwan Dept. of Computer Science Information Engineering National Central University Taoyuan County Taiwan Omnicompute Co. Ltd. San Shia SinBei City Taiwan

This paper proposes an innovative concept of community, called Mirror Reality, which is formed by the seamless interaction between users of physical space and virtual world. The Mirror Reality is relying on a portal to achieve the data translation and communication between virtual and reality worlds. This study employs the Ontology technology to analyze unified representation of objects and events in both virtual world and physical space. Furthermore, the research issues of creating a Mirror Reality are also identified. The portal that is implemented from the analysis is called Portality to emphasize its role between virtuality and reality. In other words, Portality takes care all of the data conversion and processing to permit the interoperability between two totally different worlds. Finally, the prototype of Mirror Reality for the university campus with its Portality is illustrated at the end.

关键词： Mirrors Ontologies Communities Avatars Humans Sensors Context

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Recent trends in computational intelligence in life sciences 19

Recent trends in computational intelligence in life sciences

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19th European Symposium on Artificial Neural Networks, ESANN 2011

作者： Seiffert, Udo Schleif, Frank-Michael Zühlke, Dietlind Fraunhofer IFF Magdeburg Dept. Biosystems Engineering Sandtorstrasse 22 Magdeburg39106 Germany University of Magdeburg Institute of Electronics Signal Processing and Communications P.O. Box 4120 Magdeburg39016 Germany University of Bielefeld AG Theoretical Computer Science Universitätsstrasse 21-23 Bielefeld33615 Germany RWTH Aachen University Dept. Information Systems Ahornstrasse 55 Aachen52056 Germany Fraunhofer FIT Sankt Augustin Dept. Life Science Informatics Schloss Birlinghoven Sankt Augustin53754 Germany

ISBN: (纸本)9782874190445

Computational intelligence generally comprises a rather large set of – in a wider sense – adaptive and human-like data analysis and modelling methods. Due to some superior features – such as generalisation, trainability, coping with incomplete and inconsistent data, etc. – computational intelligence has found its way into numerous applications in almost all scientific disciplines. A very prominent field among them are life sciences that are characterised by some unique requirements in terms of data structure and analysis. © European Symposium on Artificial Neural Networks. All rights reserved.

关键词： Neural networks

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Welcome from the industrial track chair and the industrial forum chair

Proceedings of the European Conference on Software Maintenan...

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Proceedings of the European Conference on Software Maintenance and Reengineering, CSMR 2011年 303-304页

作者： Tjortjis, Christos Zillmann, Christian Dept. of Computer Science Univ. of Ioannina Ioannina Greece Dept. of Engineering Informatics and Telecoms University of W. Macedonia Kozani Greece OFFIS - Institute for Information Technology Escherweg 2 26121 Oldenburg Germany

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Analysis of change of landuse pattern of large scale landuse/landcover images

Advances in Modelling and Analysis B

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Advances in Modelling and Analysis B 2011年第1-2期54卷 44-56页

作者： Haider, P. Mandal, J.K. Mal, S. Dept. of Information Technology Jalpaiguri Govt. Engineering College Jalpaiguri W.B. India Dept. of Computer Science and Engineering University of Kalyani Kalyani Nadia 741 235 W.B. India Dept. of Electrical Engineering Kalyani Govt. Engineering College Kalyani Nadia W.B. India

This paper deals with the technique to detect and analyse the change of the feature distribution of landuse pattern over a particular period of time. The changes of the landuse classes are calculated in terms of RGB values between landuse/landcover images and output is generated with variation of colors. The technique provides the changes location wise i.e. if a particular location (point) of the output image or the input image is selected, the information of latitude, longitude and the type of change of that location is generated. The tool also calculates the total area for each class of the two input images and with this information provides the graphical representation of the class wise and overall changes. Session wise feature distribution line graph is also integrated. Observation of changes of landuse pattern will reflect the changes priodically(few years interval) over a perticular area. This technique will identify the changeprone locations depending upon the detection of variation of clustered pixel values among sessions of a location which leads to predict future distribution of landuse classes of a desired location.

关键词： Location

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A study on the effect of traffic patterns on Routing protocols in Ad-hoc network following RPGM Mobility model

A study on the effect of traffic patterns on Routing protoco...

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International Conference on Signal Processing, Communication, Computing and Networking Technologies

作者： Arindrajit Pal Jyoti Prakash Singh Paramartha Dutta Paulomi Basu Doyel Basu Dept. of Computer Science and Engineering Academy of Technology West Bengal India Dept. of Information Technology Academy of Technology West Bengal India Department of Computer and System Sciences Visva-Bharati University West Bengal India

Mobile Ad-hoc networks(MANET)s are self organizing networks which can form a communication network without any fixed infrastructure. The constant bit rate (CBR) traffic is very well known traffic model for mobile Ad-hoc network. CBR traffic generates data packets at a constant rate. This constant rate packet generational is good enough for text data packets. The multimedia applications generally generate packets which sometimes increase and might be sometimes followed by some idle period. CBR traffic model does not accommodate the specific features of multimedia data. The day by day increase of multimedia data prompts us to investigate some other traffic models which can accommodate the specific features of these data. One such traffic model is Exponential traffic model which is based on exponential distribution. The other model is Pareto traffic model based on Pareto distribution. In this article, we have tried to study the behavior of mobile Ad-hoc network routing protocols under Exponential and Pareto traffic sources for nodes moving with Reference Point Group Mobility model (RPGM). To the best of our knowledge, this is the first attempt to analyze the effect of traffic patterns with Reference Point Group Mobility (RPGM) model on mobile ad hoc network routing. We have chosen the Normalized routing load, Packet Delivery Fraction and throughput as our figures of merit to compare various protocols. We found high Normalized Routing Load for both Exponential and Pareto traffic compared to CBR traffic in both Dynamic Source Routing (DSR) and Ad hoc On-demand Distance Vector protocol. The Packet Delivery Fraction is comparable in all types of traffic patterns and routing protocols. Throughput is high for Ad hoc On-demand Distance Vector (AODV) routing protocol across all traffic models.

关键词： Routing protocols Routing Computational modeling Mobile ad hoc networks Throughput Multimedia communication

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Extracting environmental constraints to make reactive system specifications realizable

Computer Software

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computer Software 2011年第3期28卷 132-146页

作者： Hagihara, Shigeki Shimakawa, Masaya Yonezaki, Naoki Kitamura, Yusuke Sekido, Satoshi Department of Computer Science Graduate School of Information Science and Engineering Institute of Technology Japan System Engineering Dept. Sony Business Solutions Corporation Value Creation Division Japan Department of Communications and Integrated Systems Graduate School of Science and Engineering Tokyo Institute of Technology Japan

Many fatal accidents of safety critical reactive systems have occurred in unexpected situations which had not been considered during design and test phases of the systems. To prevent these accidents, reactive systems should be designed to respond appropriately to any requests of any timing from their environments. Verifying this property in specification phase reduces the development costs of safety critical reactive systems. This property of a specification is well known as realizability. If a specification was found not to be realizable, we have to determine the flaws in the unrealizable specification. Unrealizability of a specification arises from arbitrary requirements given by system designers. From a different point of view, it can be thought that the unrealizable specification implicitly imposes a precondition on the behavior of environment, which a system can not control. If it is possible to obtain the precondition in intuitively comprehensive forms, this makes it easy for system designers to understand the cause of flaws in specifications. In this paper, we propose methods for deriving constraints on the behavior of environments, which is implicitly imposed by unrealizable specifications. Instead of realizability, we use strong satisfiability which is a necessary condition for realizability, due to the fact that many practical unrealizable specifications are also strongly unsatisfiable, and strong satisfiability have the advantage of lower complexity for analysis against realizability. These methods derive constraints in propositional linear temporal logic from Büchi automata representing specifications. The expressions of derived constraints are limited to simple and intuitively comprehensive forms where only two temporal operators appear successively. We give proofs for three correctness properties of our methods, i.e. the termination property, the soundness property, and the weakest constraints derivability. We also discuss complexity of our methods. Fi

关键词： Specifications

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A case analysis of factors affecting the adoption of grid technology by universities

2011 IST-Africa Conference Proceedings, IST 2011

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2011 IST-Africa Conference Proceedings, IST 2011 2011年

作者： Uzoka, F.M.E. Akinnuwesi, B.A. Olabiyisi, S.O. Alabi, D. Department of Computer Science and Information Systems Mount Royal University Calgary Canada Dept. of Information Technology Bells University of Techn Ota Nigeria Department of Computer Science and Engineering Ladoke Akintola University of Technology Ogbomosho Nigeria Dept of Information Technology Bells University of Technology Ota Nigeria

ISBN: (纸本)9781905824267

Grid computing is emerging as the foundation upon which virtual collaborations can be built among large organizations with the aim of integrating and sharing computer resources, and thus offering performance speed and resource availability, which is unattainable by any single institutional technology resources. With the level of increase in the number of tertiary institutions in Africa, and the attendant lack of basic information technology resources, the use of grid computing for collaboration purposes would contribute to the enhancement of research, course delivery, course management, and other aspects of institutional development. This paper carries out an empirical study of the possibility of adoption of grid computing as a vehicle for collaboration among tertiary institutions in Nigeria from the perspective of the potential adopters (users) of the systems. This study uncovers challenges to the adoption of grid technology by the tertiary institutions. The key challenges that significantly affect the adoption of grid computing in tertiary institutions are mainly attitudinal (perceived need and perceived benefits). Infrastructural issues (facilitating conditions) also impose limitations on the ability of universities to implement grid computing. © 2011 IIMC LTD.

关键词： Curricula

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Forward error correction with RaptorQ Code on embedded systems

Forward error correction with RaptorQ Code on embedded syste...

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Midwest Symposium on Circuits and Systems (MWSCAS)

作者： T. Mladenov K. Kim S. Nooshabadi Dept. Information & Communications Gwangju Institute of Science and Technology Gwangju South Korea Department of Electrical and Computer Engineering Michigan Technological University Houghton MI

Raptor code, a member of the rateless fountain codes family, has been a preferred technology for the forward error correction (FEC) at the application layer. It is used by the 3 rd Generation Partnership Program (3GPP) Multimedia Broadcast/Multicast Service (MBMS) and Digital Video Broadcasting (DVB-H) standards for multimedia broadcast and content delivery. Currently, a next generation fountain code, called RaptorQ, is being proposed. It aims at reducing to a minimum the redundant FEC information, outperforming significantly Raptor code. The improved coding performance comes at the expense of increased encoding and decoding complexity. This paper compares the coding properties, the decoding performance and the energy efficiency of the two codes on embedded system. Furthermore, simulations are performed for a practical MBMS scenario. Finally, conclusions are drawn with respect to the applicability of the new code for realtime multimedia broadcasting and content delivery.

关键词： Decoding Hardware Radio access networks Radiation detectors

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