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The Fifth International Conference on Information Assurance and Security(第五届信息保障与安全国际会议)

作者： Changlu Lin Lein Harn Dingfeng Ye Key Laboratory of Network Security and Cryptology Fujian Normal University China State Key Laborat Department of Computer Science Electrical Engineering University of Missouri-Kansas CityUSA State Key Laboratory of Information Security Graduate University of Chinese Academy of SciencesChin

ISBN: (纸本)9780769537443

Shamir proposed the first (t, n) threshold secret sharing scheme. Shamir's scheme is ideal and perfect. In this paper, we propose two modifications of Shamir's secret sharing scheme. In our first modification, each shareholder keeps both x-coordinate and y-coordinate of a polynomial as private share. In our second modification, dealer uses polynomial with degree larger than the threshold value t to generate shares for a (t, n) threshold scheme. We show that these two modified schemes are ideal and perfect. Using these two modifications, we design a multilevel threshold secret sharing schemes (MTSS). We prove that the proposed scheme is secure.

关键词： Secret sharing threshold multilevel threshold secret sharing

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Discovering Complex Semantic Matches between Database Schemas

Discovering Complex Semantic Matches between Database Schema...

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International Conference on Web Information Systems and Mining (WISM)

作者： Ying Qian Yuxiang Li Jinling Song Liwen Yue Network and Modern Education Technology Center Hebei Normal University of Science and Technology (HBNUST) Qinhuangdao Hebei China Department of Computer Hebei Normal University of Science and Technology (HBNUST) Qinhuangdao Hebei China College of Information and Engineering Yanshan University슠 Qinhuangdao Hebei China

Schema matching, the problem of finding semantic correspondences between elements of two schemas, plays a key role in many applications, such as data warehouse, heterogeneous data sources integration and semantic Web. The existing approaches to automating schema matching almost focus on computing direct element matches (1:1 matches) between two schemas. However, relationships between real-world schemas involve many complex matches besides 1:1 matches. At present, there are few methods can discover complex matches, such as iMAP, but they have bad matching efficiency, because the candidate matches space is so large which they need searching. A complex schema matching system called CSM is introduced in this paper. Firstly it can filter unreasonable matches on data types and values by preprocessor and clustering processor, and employs a set of special-purpose searchers in match generator to explore a specialized portion of the search space and discovers 1:1 and complex matches. Then it estimates candidate matches and selects optimal candidate matches by using similarity estimator and match selector respectively. Finally, according to the problem that there are opaque columns in the schemas being matched, it can apply complementary matcher to discover matching relations between opaque columns further more. Thereby it can discover more general, reasonable matching pairs. Experiments show that, CSM does not only discover matches between schemas roundly, but also improve the matching recall and precision in practice.

关键词： Relational databases Data warehouses Semantic Web Information systems computer science education Educational technology Educational institutions Matched filters Costs Euclidean distance

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Multicast, hierarchical and fast handover in mobile IPv6 wireless network: A test-bed experience

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International Journal of computers and Applications 2008年第3期30卷 207-212页

作者： Eu, Y.C. Khatun, S. Ali, B.M. Othman, M. Department of Computer and Communication Systems Engineering Faculty of Engineering University Putra Malaysia Department of Communication Technology and Network Faculty of Computer Science University Putra Malaysia

Mobile IPv6 (MIPv6) allows mobile devices to be always addressed by its home address. This paper describes a micro-mobility based test-bed development with enhanced MIPv6 features including multicast function and hierarchical design. The test-bed is hardware and software based comprising of five Personal computers (PCs) and one laptop. The laptop represents the Mobile Node (MN) while the functions of the PCs are as follows;two as Access Points (AP), one as Home Agent (HA), and the other two as foreign Multicast Router (MR) and Correspondent Node (CN) respectively. This test-bed is used to analyze handover delay, packet delay, packet loss, throughput and overall throughput in real wireless environment for conventional handover and enhanced MIPv6 handover scenarios. The results show the enhanced handover scheme reduces handover delay 94.32% (4.35s-0.2s), packet delay by 84.43% (0.7s-0.109 s), packet loss from 44 to 0 packet while the throughput and overall throughput were increased by approximately 117.34% and 124.3% respectively over the conventional system. Finally, it can be concluded that the proposed scheme gives advantages of higher throughput, zero packet loss and lower delays and can significantly improve micro-mobility performance of 3G, 4G and beyond mobile communication systems.

关键词： Packet loss

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Topology-aware Overlay Multicast over IP Multicast networks

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Journal of Shanghai Jiaotong university(Science) 2008年第1期13卷 91-96页

作者：陈逍邵华钢汪为农 Department of Computer Science and Engineering Shanghai Jiaotong University Regional Network Center of East China

Most existing overlay multicast approaches refuse to consider any network layer support no matter whether it is available or not. This design principle greatly increases the complexity of the routing algorithms and makes the overlay topologies incompatible with the underlying network. To address these issues, topology-aware overlay multicast over IP multicast networks (TOMIMN) was proposed as a novel overlay multicast protocol, which exploits the cooperation between end-hosts and IP multicast routers to construct a topology-aware overlay tree. Through a little modification to protocol independent multicast sparse mode (PIM-SM), a multicast router is able to receive registration from nearby group members and redirect passing-by join requests to them. Due to the multicast router's support, TOMIMN organizes its group members into an overlay multicast tree efficiently, which matches the physical network topology well.

关键词： overlay networking network architecture overlay multicast

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Distributed P2P-SIP conference construction 08

Distributed P2P-SIP conference construction

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International Conference on Mobile Technology, Applications, and Systems, Mobility'08

作者： Tirasoontorn, Karn Kamolphiwong, Sinchai Sae-Wong, Suthon Centre for Network Research Department of Computer Engineering

ISBN: (纸本)9781605580890

SIP-based Internet Telephony is an increasingly popular communication system that is used by various users and organizations. Most of deployments are based on client/server model in traditional SIP system. Especially, conferencing function is used for voice/video conference include file transfer and share remote applications through internet network. The conferencing system has an association between SIP user agents (Participants) and central point of control (Focus). The functionalities of SIP conference are organized in a centralized manner and heavily rely on dedicated servers. And it has some drawbacks to make the conferencing system is not reliable and scalable when participants increase. Peer-to-Peer (P2P) is another model different from client/server model. Every peer plays an equally important role in the network. P2P network is self-organized architecture, does not require any server in the network and hence make a good solution to those problems mentioned in above. In this paper, we describe the architecture designed to construct Peer-to-Peer (P2P) network collaborating with existing traditional SIP for conferencing system. The details in this paper include the operations of how to create, join, leave and terminate the conference in P2P-SIP conference network. We have shown that our proposed scheme compared to other recently schemes is more attractive in terms of scalability (e.g. based on pure P2P), working with traditional SIP, as well as interactive communication approach for all SIP clients and extend function join our P2P-SIP conference. Copyright 2008 ACM.

关键词： network architecture

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Route optimization in nested mobile networks using binding update for top-level MR 08

Route optimization in nested mobile networks using binding u...

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4th Asian Internet engineering Conference, AINTEC 2008

作者： Sornlertlamvanich, Parin Elz, Robert Kamolphiwong, Sinchai Department of Computer Engineering Faculty of Engineering Centre for Network Research Thailand

ISBN: (纸本)9781605581279

network Mobility (NEMO) Basic Support protocol is an extension Mobile IPv6. NEMO signaling is performed with extended of Mobile IPv6 messages. NEMO Basic Support protocol is concerned with managing the mobility of an entire network, it provides for devices or vehicles which move to another point of attachment to the Internet. NEMO can maintain sessions established between nodes on the mobile network and the global Internet after the Mobile Router (MR) changes its point of attachment. However, NEMO uses a bi-directional tunnel between the MR and its Home Agent (HA), resulting in a pinball route between 2 nodes. In addition, nested mobile networks will further increase the sub-optimality of routing, causing problems for some application. This proposed solution decreases packet delay, network resource usage and processing delay. Also, the bi-directional tunnel can be avoided, and the level of nesting of mobile networks does not increase packet overhead. This solution only requires modification of the MR. Copyright 2008 ACM.

关键词： Wireless networks

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Prostate cancer localization with multispectral MRI based on Relevance Vector Machines

Prostate cancer localization with multispectral MRI based on...

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IEEE International Symposium on Biomedical Imaging

作者： S. Ozer M. A. Haider D. L. Langer T. H. van der Kwast A. J. Evans M. N. Wernick J. Trachtenberg I. S. Yetik Medical Imaging Research Center (MIRC) Electrical & Computer Engineering Department Illinois Institute of Technology Chicago IL USA Joint Department of Medical Imaging Princess Margaret Hospital University Health Network and Mount Sinai Hospital Toronto ONT Canada Institute of Medical Science University of Toronto Toronto ONT Canada Department of Pathology and Laboratory Medicine Toronto General Hospital Toronto ONT Canada

ISBN: (纸本)9781424439317

Prostate cancer is one of the leading causes of cancer death for men. However, early detection before cancer spreads beyond the prostate can reduce the mortality. Therefore, in vivo imaging techniques play an important role to localize the prostate cancer for treatment. Although magnetic resonance imaging (MRI) has been proposed to localize prostate cancer, the studies on automated localization with multispectral MRI have been limited. In this study we propose combining the pharmacokinetic parameters derived from DCE MRI with T2 MRI and DWI. We also propose to use relevance vector machines (RVM) for automatic prostate cancer localization, compare its performance to support vector machines (SVM) and show that RVM can produce more accurate and more efficient segmentation results than SVM for automated prostate cancer localization with multispectral MRI.

关键词： Prostate cancer Magnetic resonance imaging Support vector machines Biomedical imaging Hospitals Needles Cancer detection Image segmentation Humans Neoplasms

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Important scene analysis model using result importance and situation importance

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International Journal of Wireless and Mobile Computing 2009年第4期3卷 225-235页

作者： Hashimoto, Takako Katooka, Takashi Iizawa, Atsushi Kitagawa, Hiroyuki Software RandD Group RICOH Company Ltd. Bukyo-ku Tokyo 112-0002 Japan Department of Computer Science Graduate School of Systems and Information Engineering University of Tsukuba Tsukuba Ibaraki 305-8573 Japan Chiba University of Commerce Japan Network Solution and Services Center Global Marketing Group RICOH Company Ltd. Japan Ricoh IT Solutions Co. Ltd. Japan

Functional improvements to mobile terminals have made possible the spread of multimedia information delivery services. Especially for sports, a service that extracts important scenes and reports them to users has become popular. We take the approach that situational changes in a game's progress can be presented as state transitions, and devise an important scene analysis model based on Result Importance (RI), which represents each situation's actual importance, and Situation Importance (SI), which shows the degree of a chance at the situation. With our model, significant scenes are extracted dynamically. Experimental results indicate that the proposed method is very promising. Copyright © 2009 Inderscience Enterprises Ltd.

关键词： Multimedia systems

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Metamaterial with negative index due to chirality

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Physical Review B 2009年第3期79卷 035407-035407页

作者： E. Plum J. Zhou J. Dong V. A. Fedotov T. Koschny C. M. Soukoulis N. I. Zheludev Optoelectronics Research Centre University of Southampton Southampton SO17 1BJ United Kingdom Department of Electrical and Computer Engineering and Microelectronics Research Center Iowa State University Ames Iowa 50011 USA Department of Physics and Astronomy and Ames Laboratory Iowa State University Ames Iowa 50011 USA Institute of Optical Fiber Communications and Network Technology Ningbo University Ningbo 315211 China Institute of Electronic Structure and Laser—FORTH and Department of Materials Science and Technology University of Crete Greece

Recently it has been predicted that materials with exceptionally strong optical activity may also possess a negative refractive index, allowing the realization of superlenses for super-resolution imaging and data storage applications. Here we demonstrate experimentally and numerically that a chirality-induced negative index of refraction is possible. A negative index of refraction due to three-dimensional chirality is demonstrated for a bilayered metamaterial based on pairs of mutually twisted planar metal patterns in parallel planes, which also shows negative electric and magnetic responses and exceptionally strong optical activity and circular dichroism. Multilayered forms of the metamaterial are found to be suitable for use as ultrathin polarization rotators and circular polarizers for practical applications.

关键词： chirality circular dichroism metamaterials optical materials optical multilayers optical rotation polarisation refractive index

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Learning video segmentation and presentation system based on visual and audio information

Learning video segmentation and presentation system based on...

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2008 the 1st IEEE International Conference on Ubi-Media Computing and Workshops, U-Media2008

作者： Liao, Yi Chun Huang, Chun-Hong Department of Computer Science and Information Engineering China University of Technology Department of Computer information and Network Engineering Lunghwa University of Science and Technology

ISBN: (纸本)9781424418657

Learning video system is used in distance learning programs to deliver pre-recorded lectures. In this paper, we start our discussion on a multimedia presentation recording system which we had developed. We then present how the video recording concept can be further extended to realize a video segmentation system, which is based on video content information. The visual and audio information of a learning video is different. We also point out that a video classification technology can be further integrated to enhance the tool, to enable a more realistic and useful system for the discussion in distance education. © 2008 IEEE.

关键词： Video recording

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