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Building a multimedia next generation network

WSEAS Transactions on Communications 2006年第2期5卷 225-230页

作者： Raptis, L. Kagklis, D. Patikis, Y. Hatzilias, G. Zervos, N. Zahariadis, T. Crhonis, D. Ioannou, K. Garmpis, A. Department of Electrical Engineering and Computer Science National Technical University of Athens 9 Heroon Polytechniou 15773 Zographou Athens Greece Ellemedia Technologies Ltd. 223 Syggrou Av. GR-17121 Athens Greece Hellenic Telecommunications Organization S.A. 99 Kifissias Ave. 151 24 Athens Greece Wireless Telecommunication Laboratory Department of Electrical and Computer Engineering University of Patras Rion 26500 Patras Greece Department of Applied Informatics in Management and Economy Technological Educational Institution of Messolonghi Messolonghi 30100 Greece

The last years, the voice and the Internet access services have become a commodity, having as a result the offering from network providers, both fixed and mobile, a bunch of services. These developments are posing new requirements to existing networks, which are circuit based, and an evolution path is needed towards next generation networks, which allows the provision of multimedia services with guarantee quality of service. Mobile operators are facing the greatest challenges, since they have to reform their networks in order to provide data and multimedia services and the definition of the IP multimedia Subsystem (IMS) framework is one step towards that direction. The purpose of this paper is to shed light on significant issues, in terms of network architecture and protocols of multimedia next generation networks,,allowing the definition of an evolution scenario of existing networks towards next generation multimedia networks.

关键词： Telecommunication services

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A study of the intension of using computer as a strategic resource of web searching

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WSEAS Transactions on Communications 2006年第9期5卷 1852-1857页

作者： Chu, Yao-Ming Ju, Chen Ying Yang, Hong-Jen Yang, Hsieh-Hua Hu, Wen-Chen Department of Industrial Technology Education National Kaohsiung Normal University No.116 Heping 1st Rd. Lingya District Kaohsiung City 802 Taiwan Department of Health Care Management Chung Jung Christian University 396 Chang Jung Rd. Kway Jen Tainan 71101 Taiwan Department of Computer Science University of North Dakota Grand Forks ND United States

The purpose of this study was to explore the awareness of Technology strategic usefulness of computers as a searching tool. The argument of this study was that people using technology because of knowing its usefulness. If people recognized usefulness of technology, the strategic usefulness would be enhanced aware via the learning of technology strategic importance. A nonequivalent pretest-posttest control group design was applied on senior high school students in the study. The sampled subjects were one hundred and eleven students. Fifty-five of them were treated as the experimental group, and the other fifty-six were treated as the control-group. Members of experimental group were offered classes based on original uses of web-search and teaching of "Technology Strategic Usefulness, TSU" material. On the other hand, the member-students of control group were offered with ordinary uses of Web-search. An evaluation tool was designed for learning achievement of logic. For both technology usefulness and technology strategic usefulness, a scale of usefulness was also layout. After the experimental treatment, students took both Web-search Logic Achievement Test and Technology strategic usefulness of Web-search Scale. Statistical analysis was applied to reveal the experimental results. The findings of this research are :(1) the relationship between usefulness and strategic importance was significant. (2) Strategic importance is an antecedent of technology strategic usefulness.

关键词： Online searching

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Secure topology for electronic medical record transmissions

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Journal of Applied sciences 2006年第6期6卷 954-958页

作者： Alanazi, Hamdan O. Mat Kiah, M.L. Zaidan, A.A. Zaidan, B.B. Alam, Gazi Mahabubul Faculty of Computer Science and Information Technology University Malaysia 50603 Kuala Lumpur Malaysia Faculty of Engineering Multimedia University Jalan Multimedia 63100 Cyberjaya Selangor Malaysia Network and Commuunication Secutiry Reasearch Group ICT and Computational Science Research Cluster University of Malaya 50603 Kuala Lumpur Malaysia Department of Educational Management Planning and Policy Faculty of Education University of Malaya 50606 Kuala Lumpur Malaysia Faculty of Applied Medical Science King Saud University P.O. Box 2454 Riyadh 11451 Saudi Arabia

In this study, handshake protocol for patient, medical center and doctor, medical center is proposed for electronic medical record transmission to improve the confidentiality of data transmission and non-repudiation of sending and receiving medical records. The proposed topology depends on symmetric and asymmetric cryptography to achieve high level of secrecy for electronic medical records. The new topology has been described on multi-users (i.e., Doctors and Patient). The new topology has been implemented using Ntru crypto-system and AES encryption method. The proposed solution has been tested to have high level of confidentiality up to the legal age of the medical records. © 2010 Asian Network for Scientific Information.

关键词： Topology

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Providing service standardisation for virtual enterprises

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WSEAS Transactions on Circuits and Systems 2005年第11期4卷 1545-1552页

作者： Vassiliadis, B. Tsaknakis, J. Drossos, L. Sirmakessis, S. Ioannou, K. Internet and Multimedia Technologies Academic Research Computer Technology Institute Patras Greece Computer Science Hellenic Open University 13-15 Tsamadou st. GR-26222 Patras Greece Department of Applied Informatics in Management and Economy Technical Education Institute of Messologi Messologi Greece Wireless Telecommunication Laboratory Department of Electrical and Computer Engineering University of Patras Rion 26500 Patras Greece

Virtual Enterprises are a, relatively, new business model that is greatly depended on network technology. Providing services in such an environment is a challenge in itself;architectural, technological and organisational difficulties have not permitted yet the development of a framework for Virtual Enterprise enaction. In this paper we describe a Virtual Private Network architecture that uses special monitor and coordination processes in order to achieve efficient delivery of services and activities in Virtual Enterprise environments. We discuss the general architecture of the system, emphasising on the solutions used to monitor and co-ordinate various activities.

关键词： Virtual reality

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An architecture for mobile-health care service provision

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WSEAS Transactions on computers 2005年第11期4卷 1502-1509页

作者： Votis, K. Vassiliadis, B. Tsaknakis, J. Stefani, A. Ioannou, K. Drossos, L. Dept. of Computer Engineering and Informatics University of Patras Patras Greece Department of Computer Science Hellenic Open University Greece Dept. of Electrical and Computer Engineering University of Patras Patras Greece Dept. of Applied Informatics in Management and Economy Technical Education Institute of Messologi Greece

This paper introduces the architecture of an open information and communication platform that integrates all relevant participants in health and social sector. The main concept of the proposed platform is based on concept introduced by new computing paradigms and the need of transformation of the existing internetworking and web technologies into a human resource pool that will be accessible by anyone, at anytime, and from everywhere in support of their needs. This platform intends to create the essential infrastructure for the provisioning of health and social services to individuals that receive residential care using Peer-to-Peer (P2P) networks over Internet, GSM and PSTN networks. The use of new computing models such as Service-Oriented computing, Grid, P2P and argumentation technologies are discussed. Furthermore, the functional requirements and the architecture of a complete solution are presented.

关键词： Intelligent agents

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Platform-based synthesis design methodology for system-on-chips

Platform-based synthesis design methodology for system-on-ch...

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2005 6th International Conference on Electronics Packaging Technology

作者： Wen, Quan Liu, Bo He, Jianmin Department of Management Science and Engineering Southeast University Nanjing 210096 China Department of Computer Science and Technologies Second Northwest University for Minorities Yinchuan 750021 China Department of Computer Science and Engineering Southeast University Nanjing 210096 China

ISBN: (纸本)0780394496

Platform-based design for system-on-chips (SoCs) uses existing designs as starting points for new system implementations and put more stress on system level reuse. Synthesis methods are important elements in platform-based design methodologies. This paper takes hardware/software (HW/SW) co-design and high level design reuse as keys to SoC design. First, it introduces a system level coexploration methodology and presents a typical platform-based design flow. Then it emphasizes performance analysis, considering a problem called the first-generation dilemma, proposes a revised platform-based design flow. To support design technology innovations, several synthesis issues are discussed, such as platform reuse, configurable architecture, and system level verification. In addition, it adopts market-oriented views and synthesis tools such as Cadence VCC to make the design practical. © 2005 IEEE.

关键词： Microprocessor chips

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Some new algorithms for knowledge discovery in local hypertext corpora

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WSEAS Transactions on Circuits and Systems 2005年第11期4卷 1493-1500页

作者： Vassiliadis, B. Stefani, A. Drossos, L. Ioannou, K. Computer Science Hellenic Open University 13-15 Tsamadou st. GR-26222 Patras Greece Department of Applied Informatics in Management and Economy Technical Education Institute of Messologi Messologi Greece Wireless Telecommunication Laboratory Department of Electrical and Computer Engineering University of Patras Rion 26500 Patras Greece

The wealth of information available in the internet or local corpora has increased while our ability to search and retrieve relevant information is being reduced. Hypermedia, being complex information objects, are difficult to manage. In this paper we propose some new algorithms for searching and retrieving hypermedia documents from a local server by taking advantage content and context information. Besides presenting new solutions for hypertext, we review the state of the art in multimedia data mining and present future trends in this research area.

关键词： Data mining

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Optical transmitter bandwidth requirements for POF telecom links

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WSEAS Transactions on Circuits and Systems 2005年第11期4卷 1608-1613页

作者： Louvros, S. Ioannou, K. Vassiliadis, B. Drossos, L. Kotsopoulos, S. Wireless Telecommunication Laboratory Department of Electrical and Computer Engineering University of Patras Rion 26500 Patras Greece Computer Science Hellenic Open University 13-15 Tsamadou st. GR-26222 Patras Greece Department of Applied Informatics in Management and Economy Technical Education Institute of Messologi Messologi Greece

Light emitting diodes (LED) are usually the alternative optoelectronic devices for optical communications with moderate bandwidth efficiency and bit rates, compared to semiconductor lasers. Laser applications dominate the long distance communication networks. However LED seems to be a very good solution, especially in very short distance communication networks, where Plastic Optical Fibers, (POF) are used as the optical transmission medium. This paper investigates a qualitative technique of calculating the bandwidth, based on first principles of semiconductor physics. This technique is more convenient for a first approach of the subject on optical communication networks and its simplicity provides a very useful analytical tool. Finally these results are compared with the existing experimental ones.

关键词： Optical links

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ONE-TO-ONE TECHNOLOGY-ENHANCED LEARNING: AN OPPORTUNITY FOR GLOBAL RESEARCH COLLABORATION

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Research and Practice in Technology Enhanced Learning 2006年第1期1卷 3-29页

作者： TAK-WAI CHAN JEREMY ROSCHELLE SHERRY HSI KINSHUK MIKE SHARPLES TOM BROWN CHARLES PATTON JOHN CHERNIAVSKY ROY PEA CATHIE NORRIS ELLIOT SOLOWAY NICOLAS BALACHEFF MARLENE SCARDAMALIA PIERRE DILLENBOURG CHEE-KIT LOOI MARCELO MILRAD ULRICH HOPPE Research Center for Science and Technology for Learning National Central University 300 Jhongda Road Jhongli City 32001 Taiwan ROC Center for Technology in Learning SRI International 333 Ravenswood Ave BN-376 Menlo Park California 94025 USA Center for Learning and Teaching The Exploratorium 3601 Lyon Street San Francisco California 94123 USA Advanced Learning Technologies Research Centre Massey University Private Bag 11-222 Palmerston North New Zealand Learning Sciences Research Institute Nottingham University Jubilee Campus Wollaton Road Nottingham NG8 1BB UK University of Pretoria Telematic Learning & Education Innovation Lynnwood Road Hillcrest Pretoria South Africa 0002 South Africa National Science Foundation 4201 Wilson Boulevard Arlington Virginia 22230 USA Stanford Center for Innovations in Learning Stanford University Wallenberg Hall Building 160 450 Serra Mall Stanford CA 94305-205 USA Department of Cognition and Technology University of North Texas Matthews Hall 316-D PO Box 311337 Denton TX 76203-1337 USA Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI 48109 USA Laboratoire Leibniz 46 Avenue Félix Viallet 38031 Grenoble Cedex France Institute for Knowledge Innovation and Technology OISE/University of Toronto 252 Bloor Street West Toronto Ontario M5S 1V6 Canada Swiss Federal Institute of Technology Ecole Polytechnique Fédérale de Lausanne 1015 Lausanne Switzerland Learning Sciences Lab National Institute of Education Nanyang Technological University 1 Nanyang Walk Singapore 637616 Singapore Center for Learning and Knowledge Technologies Växjö University MSI Växjö University Vejdes plats 6 och 7 351 95 Växjö Sweden Institute for Computer Science and Interactive Systems University Duisburg-Essen Building LF Lotharstr. 63/65 47048 Duisburg Germany

Over the next 10 years, we anticipate that personal, portable, wirelessly-networked technologies will become ubiquitous in the lives of learners — indeed, in many countries, this is already a reality. We see that ready-to-hand access creates the potential for a new phase in the evolution of technology-enhanced learning (TEL), characterized by "seamless learning spaces" and marked by continuity of the learning experience across different scenarios (or environments), and emerging from the availability of one device or more per student ("one-to-one"). One-to-one TEL has the potential to "cross the chasm" from early adopters conducting isolated design studies to adoption-based research and widespread implementation, with the help of research and evaluation that gives attention to the digital divide and other potentially negative consequences of pervasive computing. We describe technology-enhanced learning and the affordances of one-to-one computing and outline a research agenda, including the risks and challenges of reaching scale. We reflect upon how this compares with prior patterns of technology innovation and diffusion. We also introduce a community, called "G1:1," that brings together leaders of major research laboratories and one-to-one TEL projects. We share a vision of global research, inviting other research groups to collaborate in ongoing activities.

关键词： Technology-enhanced learning research collaboration pervasive computing wireless technologies

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Minimum disc cover set construction in mobile ad hoc networks

Minimum disc cover set construction in mobile ad hoc network...

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Third International Conference on computer Network and Mobile Computing, ICCNMC 2005

作者： Sun, Min-Te Ma, Xiaoli Yi, Chih-Wei Yang, Chuan-Kai Lai, Ten H. Wireless Engineering Research and Education Center Auburn University United States Department of Computer Information Science National Chiao Tung University Taiwan Department of Information Management National Taiwan University of Science and Technology Taiwan Department of Computer Science and Engineering Ohio State University United States

The minimum disc cover set can be used to construct the dominating set on the fly for energy-efficient communications in mobile ad hoc networks. The approach used to compute the minimum disc cover set proposed in previous study has been considered too expensive. In this paper, we show that the disc cover set problem is in fact a special case of the general α-hull problem. In addition, we prove that the disc cover set problem is not any easier than the α-hull problem by linearly reducing the element uniqueness problem to the disc cover set problem. In addition to the known α-hull approach, we provide an optimal divide-and-conquer algorithm that constructs the minimum disc cover set for arbitrary cases, including the degenerate ones where the traditional α-hull algorithm incapable of handling. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Telecommunication networks

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