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IEEE International Symposium on World of Wireless Mobile and Multimedia Networks (WoWMoM)

作者： P. Raptis V. Vitsas K. Paparrizos P. Chatzimisios A.C. Boucouvalas Department of Information Technology Technological Educational Instituite of Athens Thessaloniki Greece Department of Applied Informatics University of Macedonia Thessaloniki Greece School Design Engineering & Computing Bournemouth University Poole UK

The paper studies the packet delay distribution of the IEEE 802.11 distributed coordination function (DCF) protocol. DCF treats packets in an unfair manner. Results indicate that, in large networks, most packets have very low time delays, some packets have delays close to the average value and a small number of packets experience extremely high delays. We study the DCF delay distribution by developing a mathematical model that calculates the important properties of the constituent curves of the delay distribution curve, namely the probability that a packet is successfully transmitted from a particular backoff stage and the average delay of the successfully transmitted packets from this backoff stage. The model is simple, gives an insight into the internal mechanisms of DCF and applies to both basic and RTS/CTS access mechanisms. The accuracy of the analytical model is verified by simulations. Analytical results are presented that explore the effect of network size and of the initial contention window size on the fairness of DCF regarding the distribution of packet delays.

关键词： Delay effects Mathematical model Probability Analytical models Access protocols Media Access Protocol Physical layer Transmitters Throughput Information technology

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Semantic interoperability in tools for intercultural collaboration

Semantic interoperability in tools for intercultural collabo...

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Proceedings of the International Conference on Active Media Technology, AMT

作者： K. Funakoshi K. Sugiyama T. Ishida T. Yoshino J. Munemori H. Zhang Z. Shi NTT Communication Science Laboratories NTT Corporation Japan Graduate School of Informatics Kyoto University Japan Faculty of Systems Engineering Wakayama University Faculty of Systems Engineering Wakayama University Japan Institute of Computing Technology Chinese Academy of Science China

In software/content development in intercultural environments, collaboration among participants and effective administration are crucial for overall successful projects. Various tools are used to achieve the collaboration and the administration of the project: no single groupware is sufficient for both collaboration support and management. Therefore, interoperability among various tools employed in one project is essential for efficient collaboration. To establish semantic interoperability of collaboration tools, we have designed an RDF tag set that can function as vocabulary to describe information interoperably among the tools. In this paper, we propose a tag set to describe information in intercultural projects and show how the data in collaboration tools and project management tools are integrated with those semantic tags. With the tag set and the supporting method, it is expected that the members and the administrators do not have to pay much efforts to keep the collaboration status.

关键词： Collaborative tools Collaborative work Collaborative software Project management Collaboration Vocabulary Cultural differences Ontologies informatics Systems engineering and theory

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ICDAR2005 page segmentation competition

ICDAR2005 page segmentation competition

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International Conference on Document Analysis and Recognition

作者： A. Antonacopoulos B. Gatos D. Bridson Pattern Recognition and Image Analysis (PRImA) Research Laboratory School of Computing Science and Engineering University of Sanford Manchester UK Computational Intelligence Laboratory National Center for Scientific Research Demokritos Institute of Informatics and Telecommunications Athens Greece

There is an established need for objective evaluation of layout analysis methods, in realistic circumstances. This paper describes the page segmentation competition (modus operandi, dataset and evaluation criteria) held in the context of ICDAR2005 and presents the results of the evaluation of four candidate methods. The main objective of the competition was to compare the performance of such methods using scanned documents from commonly-occurring publications. The results indicate that although methods seem to be maturing, there is still a considerable need to develop robust methods that deal with everyday documents.

关键词： Image analysis Performance analysis Image segmentation Text analysis Optical character recognition software Pattern recognition Telecommunication computing Computational intelligence Laboratories informatics

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3D data transmitting and displaying system with an omni-directional display for group learning

3D data transmitting and displaying system with an omni-dire...

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International Conference on Creating, Connecting and Collaborating Through computing

作者： Y. Yasuhara N. Kukimoto N. Sakamoto Y. Ebara K. Koyamada Faculty of Engineering Kyoto University Japan Department of Informatics Tohwa University Japan Graduate School of Engineering Kyoto University Japan Academic Center for Computing and Media Studies Kyoto University Kyoto Japan Center for the Promotion of Excellence in Higher Kyoto University Kyoto Japan

We developed a 3D data transmitting and displaying system with an omni-directional display for group learning. The omni-directional display system enables many users to watch 3D images from each viewpoint without wearing special devices. Therefore, we consider that the omni-directional display is an effective 3D displaying method in the environment of group learning. In our system, we reconstruct 3D shapes of objects from images which are captured by multi-viewpoint cameras. Next, we transmit reconstructed data to remote places and display on the omni-directional display. We realize a series of these process in real-time. Moreover, we implemented a PDA-based control user interface for the omni-directional display system, and realized the control freely from any positions around the display.

关键词： Three dimensional displays Computer displays User interfaces Education Image reconstruction Shape Personal digital assistants Data engineering Cameras Control systems

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Developing a robust part-of-speech tagger for biomedical text

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10th Panhellenic Conference on informatics, PCI 2005

作者： Tsuruoka, Yoshimasa Tateishi, Yuka Kim, Jin-Dong Ohta, Tomoko McNaught, John Ananiadou, Sophia Tsujii, Jun'ichi Honcho 4-1-8 Kawaguchi-shi Saitama 332-0012 Japan University of Tokyo 7-3-1 Kongo Bunkyo-ku Tokyo 113-0033 Japan School of Informatics University of Manchester P.O.Box 88 Sackville St Manchester M60 1QD United Kingdom School of Computing Science and Engineering Salford University Salford Greater Manchester M5 4WT United Kingdom National Centre for Text Mining P.O.Box 88 Sackville St Manchester M60 1QD United Kingdom

ISBN: (纸本)3540296735

This paper presents a part-of-speech tagger which is specifically tuned for biomedical text. We have built the tagger with maximum entropy modeling and a state-of-the-art tagging algorithm. The tagger was trained on a corpus containing newspaper articles said biomedical documents so that it would work well on various types of biomedical text. Experimental results on the Wall Street Journal corpus, the GENIA corpus, and the PennBioIE corpus revealed that adding training data from a different domain does not hurt the performance of a tagger, and our tagger exhibits very good precision (97% to 98%) on all these corpora. We also evaluated the robustness of the tagger using recent MEDLINE articles. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Speech processing

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In-field evaluation of a managed IP/MPLS over WDM provisioning solution

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IEEE COMMUNICATIONS MAGAZINE 2005年第11期43卷 S26-S33页

作者： Karayannis, F Serrat-Fernández, J Baliosian, J Rubio-Loyola, J Vaxevanakis, KG Pagomenos, G Zahariadis, TB Raptis, L Ellinas, M Chatzilias, G Chronis, DL Katopodis, HA Doukoglou, T Androulidakis, S Galis, OA Vardalachos, N Tsanakas, P Kalogeras, D Infrastructure Planning and Development Manager Greek Research and Technology Network (GRNET). Consultant CERN IT division in the area of grid computing policies. Associate Professor UPC. Senior Member of Technical Staff Ellemedia Technologies. Telecommunication Engineer Ellemedia Technologies. Technical Director of Ellemedia Technologies. Research Associate Telecommunications Laboratory of NTUA. Lecturer Informatics Department University of Piraeus. Head of the National NMC Operations Coordination Section of OTE SA. Head of the Broadband Access and Optical Core Technologies Laboratory of OTE''s R&D Department. Visiting Professor University College London. University College London. Professor School of Electrical and Computer Engineering of NTUA. Director of the Institute for Research Networking and Technologie. Chairman of GRNET. Design and Development NTUA. Design and Development GRNET Data Networks. Member of the Technical and Scientific Committee of the Greek School Network. Member of TEE

This article demonstrates results and experiences gained in the area of multilayer internetworking, with emphasis on bandwidth on-demand provisioning as well as resource and restoration management. Behavioral characteristics and numerical results were obtained from a management system prototype implemented and tested in an appropriately adapted commercial WDM environment enhanced with multivendor gigabit IP routers. The management solution, the testbed environment, and a representative evaluation scenario are presented as a means of explaining in detail the results that finally allow a global system assessment.

关键词： Computer networks Digital communications Internet protocols Computer programming Routers (Computer networks) Computer network resources

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Telemedicine with digital video transport system in Asia -Pacific area

Telemedicine with digital video transport system in Asia -Pa...

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19th International Conference on Advanced Information Networking and Applications, AINA 2005

作者： Nakashima, Naoki Okamura, Koji Hahm, Joon-Soo Kim, Young-Woo Mizushima, Hiroshi Tatsumi, Haruyuki Moon, Byung-In Han, Ho-Seong Park, Yong-Jin Lee, Jae-Hwa Youm, Sung-Kwan Kang, Chul-Hee Shimizu, Shuji Department of Medical Informatics Kyushu University Faculty of Medicine Fukuoka Japan Computing and Communications Center Kyushu University Fukuoka Japan Department of Medicine Hanyang University Medical College Seoul Korea Republic of Research Institute and Hospital National Cancer Center Goyang Gyeonggi Korea Republic of Research Institute National Cancer Center Tokyo Japan Signal Transduction and Medicine Sapporo Medical University Graduate School of Medicine Sapporo Japan Department of Surgery Breast Center Ewha WomansMokdong Hospital Seoul Korea Republic of Department of Surgery Seoul National University Bundang Hospital Seoul Korea Republic of Division of Electrical and Computer Engineering Hanyang University Seoul Korea Republic of Korea Advanced Research Network Seoul Korea Republic of School of Electrical Engineering Korea University Seoul Korea Republic of Department of Endoscopic Diagnostics and Therapeutics Kyushu University Faculty of Medicine Fukuoku Japan

ISBN: (纸本)0769522491

We have established a medical network in Asia-Pacific area with high-quality moving image on a super broad-banded internet line since February 2003. Broadcasting real-time surgery and teleconference with medical-quality videos with Digital Video Transport System (DVTS) were so useful to learn surgical techniques and other medical procedures beyond borders. We have conducted 20 events in categories of teleconference (8 times), live transmission of medical procedure (6 times), and remote attendance to scientific medical meetings (6 times) until September 2004. We had teleconferences among 3 countries in APAN-Hawaii in January 2004 (Japan, Korea and USA), and in APAN-Cairns in July 2004 (Japan, Korea and Australia). There have been no serious transmission/ ethical problems sofar. With these experiences and current achievements, we hope to extend this advanced network system to whole Asia-Pacific countries to share medical skills and knowledge. © 2005 IEEE.

关键词： Telemedicine

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Thoughtful Interaction Design: A Design Perspective on Information Technology

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2004年

作者： Jonas L?wgren Erik Stolterman

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Telemedicine with digital video transport system in Asia-Pacific area

Telemedicine with digital video transport system in Asia-Pac...

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International Conference on Advanced Information Networking and Applications (AINA)

作者： N. Nakashima K. Okamura Joon-Soo Hahm Young-Woo Kim H. Mizushima H. Tatsumi Byung-In Moon Ho-Seong Han Yong-Jin Park Jae-Hwa Lee Sung-Kwan Youm Chul-Hee Kang S. Shimizu Department of Medical Informatics Fukuoka Japan Computing and Communications Center Kyushu University Fukuoka Japan Department of Medicine Hanyang University Medical College Seoul South Korea National Cancer Center Research Institute and Hospital Goyang Gyeonggi South Korea National Cancer Center Research Institute Tokyo Japan Signal Transduction & Medicine Graduate School of Medicine Sapporo Medical University Sapporo Japan Department of Surgery and Breast Center Ewha Womans Mokdong Hospital Seoul South Korea Department of Surgery Bundang Hospital Seoul National University Seoul South Korea Division of Electrical and Computer Engineering Hanyang University Seoul South Korea Korea Advanced Research Network Seoul South Korea School of Electrical Engineering Korea University Seoul South Korea Department of Endoscopic Diagnostics and Therapeutics Kyushu University Fukuoka Japan

We have established a medical network in Asia-Pacific area with high-quality moving image on a super broad-banded Internet line since February 2003. Broadcasting real-time surgery and teleconference with medical-quality videos with digital video transport system (DVTS) were so useful to learn surgical techniques and other medical procedures beyond borders. We have conducted 20 events in categories of teleconference (8 times), live transmission of medical procedure (6 times), and remote attendance to scientific medical meetings (6 times) until September 2004. We had teleconferences among 3 countries in APAN-Hawaii in January 2004 (Japan, Korea and USA), and in APAN-Cairns in July 2004 (Japan, Korea and Australia). There have been no serious transmission/ethical problems so far. With these experiences and current achievements, we hope to extend this advanced network system to whole Asia-Pacific countries to share medical skills and knowledge.

关键词： Telemedicine Biomedical imaging Medical diagnostic imaging Teleconferencing Hospitals Network-on-a-chip Biomedical informatics Computer networks Cancer Oncological surgery

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The Healthgrid White Paper 3

The Healthgrid White Paper

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3rd Annual Conference of the Healthgrid Association, Healthgrid 2005

作者： Breton, Vincent Dean, Kevin Solomonides, Tony Aloisio, Giovanni Benkner, Siegfried Bilofsky, Howard Blanquer, Ignacio Brady, Michael Cannataro, Mario Chouvarda, Ioanna Claerhout, Brecht De Moor, Georges De Neve, Wilfried De Wagter, Carlos Fiore, Sandro Hassan, Kinda Heeren, Germaine Hernández, Vicente Herveg, Jean A.M. Hofmann, Martin Jones, Chris Koutkias, Vassilios Lloyd, Sharon Lonsdale, Guy Alonso, Victoria L. Maglaveras, Nicos Maigne, Lydia Malousi, Andigoni Martín-Sánchez, Fernando McClatchey, Richard Medico, Enzo Miguet, Serge Mirto, Maria Montagnat, Johan Nørager1, Sofie Nozaki, Kazunori Oliveira, Ilídio Castro Pennec, Xavier Poullet, Yves Merino, Juan Pedro Sánchez Strizh, Irina G. Taillet, Michel Tristram, Clive Tverdokhlebov, Nikolay Veltri, Pierangelo Ziegler, René CNRS-IN2P3 LPC Campus des Cézeaux AubiereCedex63177 France Internet Business Solutions Group Cisco Systems 9 New Square Bedfont Lakes Middlesex FelthamTW14 8HA United Kingdom University of the West of England Bristol CEMS Coldharbour Lane BristolBS6 6TH United Kingdom Center for Advanced Computational Technologies ISUFI Dept. of Innovation Engineering University of Lecce Via per Monteroni Lecce73100 Italy Institute of Scientific Computing University of Vienna Nordbergstrasse 15 ViennaA-1090 Austria University of Pennsylvania School of Engineering and Applied Science Computer and Information Science Center for Bioinformatics 1416 Blockley Hall 423 Guardian Drive PhiladelphiaPA19104-6021 United States Universidad Politecnica de Valencia Camino de Vera/n Valencia46022 Spain FRS FREng Dept. of Engineering Science Oxford University Parks Road OxfordOX1 3PJ United Kingdom Magna Graecia University of Catanzaro School of Bioinformatics and Biomedical Engineering Campus di Germaneto Viale Europa Germaneto Catanzaro88100 Italy Aristotle University The Medical School Lab of Medical Informatics Box 323 Thessaloniki54124 Greece Custodix NV Verlorenbroodstraat 120 Bus 14 MerelbekeB-9820 Belgium Research in Advanced Medical Informatics and Telematics UZ Gent 5K3 De Pintelaan 185 GentB9000 Belgium Department of Radiotherapy Ghent University Hospital Building P7 De Pintelaan 185 GentB-9000 Belgium Laboratoire LIRIS Université Lumière Lyon 2 Campus Porte des Alpes 5 avenue Pierre Mendès France Bron69676 France av. E.Mounierlaan 83 Brussels1200 Belgium Faculté de Droit de Namur - FUNDP Centre de Recherches Informatiques & Droit 5 rempart de la Vierge Namur5000 Belgium Schloss Birlinghoven Sankt Augustin53754 Germany CERN Geneva 231211 Switzerland Oxford University Computing Laboratory Wolfson Building OxfordOX1 3QD United Kingdom C&C Research Laboratories NEC Europe Ltd. Rathausallee 10 Sankt AugustinD-53757 Germany Medic

ISBN: (纸本)158603510X

Over the last four years, a community of researchers working on Grid and High Performance computing technologies started discussing the barriers and opportunities that grid technologies must face and exploit for the development of health-related applications. This interest lead to the first Healthgrid conference, held in Lyon, France, on January 16th–17th, 2003, with the focus of creating increased awareness about the possibilities and advantages linked to the deployment of grid technologies in health, ultimately targeting the creation of a European/international grid infrastructure for health. The topics of this conference converged with the position of the eHealth division of the European Commission, whose mandate from the Lisbon Meeting was "To develop an intelligent environment that enables ubiquitous management of citizens’ health status, and to assist health professionals in coping with some major challenges, risk management and the integration into clinical practice of advances in health knowledge." In this context "Health" involves not only clinical procedures but covers the whole range of information from molecular level (genetic and proteomic information) over cells and tissues, to the individual and finally the population level (social healthcare). Grid technology offers the opportunity to create a common working backbone for all different members of this large "health family" and will hopefully lead to an increased awareness and interoperability among disciplines. The first HealthGrid conference led to the creation of the Healthgrid association, a non-profit research association legally incorporated in France but formed from the broad community of European researchers and institutions sharing expertise in health grids. After the second Healthgrid conference, held in Clermont-Ferrand on January 29th–30th, 2004, the need for a "white paper" on the current status and prospective of health grids was raised. Over fifty experts from different areas of grid tec

关键词： Health risks

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