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Tourism Economics 2006年第4期12卷 543-563页

作者： Petropoulos, C. Nikolopoulos, K. Patelis, A. Assimakopoulos, V. Askounis, D. Forecasting Systems Unit School of Electrical and Computer Engineering National Technical University of Athens 15773 Zografou Athens 9 Iroon Polytechniou Str. Greece Supply Chain Management Research Group Department of Decision Sciences and Operations Management University of Manchester Manchester M15 6PB United Kingdom Ministry of Economy and Finance 10180 Athens 5-7 Nikis Str. Greece Decision Support Systems Laboratory School of Electrical and Computer Engineering National Technical University of Athens 15773 Zografou Athens 9 Iroon Polytechniou Str. Greece

Accurate forecasts of tourism demand are prerequisites in the decision making process in many organizations in the private and public sectors. Any information concerning the future evolution of tourism flows is of great importance to hoteliers, tour operators and other industries concerned with tourism, services or transportation. In the last few decades international tourism demand has attracted substantial academic interest, resulting in a wide range of successful forecasting approaches. Much attention has been paid to econometric models that use regression techniques to estimate the underlying relationship between tourism demand and its determinants;unfortunately, empirical studies suggest that these models usually fail to outperform simple time series models. The current study focuses on an alternative approach, the Tourism Technical Analysis System (TTAS), incorporating the use of technical analysis techniques and building on the similarities between stock and tourism markets. The absolute and directional accuracy of TTAS is evaluated in relation to a range of time series and econometric methods for forecasting international tourism demand, using as a benchmark well-known published research.

关键词： Forecasting Technical analysis econometric models Theta decomposition Tourism demand

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Fault-Tolerant Multilevel Converter Topology

Fault-Tolerant Multilevel Converter Topology

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IEEE International Symposium on Industrial Electronics (ISIE)

作者： Salvador Ceballos Josep Pou Igor Gabiola Jose Luis Villate Jordi Zaragoza Dushan Boroyevich ROBOTIKER Energy Unit Tecnalia Technological Corporation Basque Spain Power Quality and Renewable Energy (QuPER) Research Group Department of Electronic Engineering Technical University of Catalonia Catalonia Spain Department of Electrical and Computer Engineering Center for Power Electronics Systems (CPES) Virginia Technology VA USA

This paper presents a modified topology of the neutral-point-clamped converter. The main change consists on adding a fourth leg, which is based on the flying-capacitor converter structure. The aim of this additional leg is to provide fault tolerance to the converter. Furthermore, during normal operation mode, this leg is able to provide a stiff neutral voltage. Consequently, the low-frequency voltage oscillations that appear in the neutral point of the standard three-level topology for some operation conditions no longer exist. As a result, the modulation strategy of the three main legs of the converter does not have to take care of voltage balance, and it can be design to achieve optimal output voltage waveforms, as well as to improve efficiency of the converter. Some simulation results are presented to show viability of this approach under both, normal operation mode and fault event. Experimental results are expected to include in the final paper.

关键词： Fault tolerance Leg Capacitors Switches Sampling methods Voltage control Circuit topology Diodes Frequency Network topology

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NIPPERS: network of interpolated PeERS for Web service discovery

NIPPERS: network of interpolated PeERS for Web service disco...

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International Conference on Information Technology: Coding and Computing (ITCC)

作者： C. Makris E. Sakkopoulos S. Sioutas P. Triantafillou A. Tsakalidis B. Vassiliadis Computer Engineering & Informatics Department University of Patras Patras Greece Internet and Multimedia Technologies Research Unit RA Computer Technology Institute Patras Greece Computer Science Digital Systems & Media Computing Laboratory Hellenic Open University Patras Greece

Web services are becoming an important enabler of the semantic Web. Besides the need for a rich description mechanism, Web service information should be made available in an accessible way for machine processing. In this paper, we propose a new P2P based approach for Web services discovery. Peers that store Web services information, such as data item descriptions, are efficiently located using a scalable and robust data indexing structure for peer-to-peer data networks, NIPPERS. We present a theoretical analysis which shows that the communication cost of the query and update operations scale double-logarithmically with the number of NIPPERS nodes. Furthermore, we show that the network is robust with respect to failures fulfilling quality of Web services requirements.

关键词： Web services Peer to peer computing Robustness Costs Interpolation Tree data structures Web and internet services Multimedia systems Multimedia computing Informatics

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Bridging the Gap between Mesoscopic and Macroscopic Models: The Case of Multicellular Tumor Spheroids

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Physical Review Letters 2005年第14期94卷 148105-148105页

作者： P. P. Delsanto M. Griffa C. A. Condat S. Delsanto L. Morra Department of Physics Politecnico of Torino Torino Italy INFM-CNR Research Unit of Torino-Politecnico and Torino University Torino Italy Bioinformatics Lab Bioindustry Park of Canavese Colleretto Giacosa (TO) Italy CONICET and FaMAF Universidad Nacional de Córdoba 5000-Cordoba Argentina Department of Physics University of Puerto Rico Puerto Rico 00681 Department of Computer Engineering Politecnico of Torino Torino Italy

Multicellular tumor spheroids are valuable experimental tools in cancer research. By introducing an intermediate model, we have been able to successfully relate mesoscopic and macroscopic descriptions of spheroid growth. Since these descriptions stem from completely different roots (cell dynamics, and energy conservation and scaling arguments, respectively), their consistency validates both approaches and allows us to establish a direct correspondence between parameters characterizing processes occurring at different scales. Our approach may find applications as an example of bridging the gap between models at different scale levels in other contexts.

关键词： Tumors

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Recursive backstepping stabilization of a wheeled mobile robot

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International Journal of Advanced Robotic systems 2004年第1期1卷 287-294页

作者： Mnif, Faical Sultan Qaboos University Department of Electrical and Computer Engineering Oman Intelligent Control Design and Optimization of Complex Systems Research Unit Tunisia

This research is aimed to the development of a dynamic control to enhance the performance of the existing dynamic controllers for mobile robots. System dynamics of the car-like robot with nonholonomic constraints were employed. A Backstepping approach for the design of discontinuous state feedback controller is used for the design of the controller. It is shown that the origin of the closed loop system can be made stable in the sense of Lyapunov. The control design is made on the basis of a suitable Lyapunov function candidate. The effectiveness of the proposed approach is tested through simulation on a car-like vehicle mobile robot.

关键词： Mobile robots

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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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Inference systems by using ordinal sums and genetic algorithms

Inference systems by using ordinal sums and genetic algorith...

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Conference of the North American Fuzzy Information Processing Society - NAFIPS

作者： A. Ciaramella R. Tagliaferri W. Pedrycz DMI University of Salerno Fisciano SA Italy INFM Unit of Salemo Baronissi SA Italy Polish Academy of Sciences Systems Research Institute Warsaw Poland Department of Electrical and Computer Engineering University of Alberta Edmonton AB Canada

In this work a new approach developed by using ordinal sums to apply general t-norms to inference systems of different neuro-fuzzy systems is proposed. A genetic algorithm based strategic to search the best t-norms and/or t-conorms from data is adopted. By using the approach two known neuro-fuzzy systems, that are the fuzzy basis function network and the fuzzy relation neural network models are compared. Several experiments on synthetic and benchmark data using different parametric and non-parametric t-norms and t-conorms are made.

关键词： Genetic algorithms Fuzzy neural networks Fuzzy systems History Fuzzy logic Neural networks Mathematics Game theory Fuzzy sets Lattices

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Near‐Field Microwave Detection of Corrosion Precursor Pitting under Thin Dielectric Coatings in Metallic Substrate

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AIP Conference Proceedings 2003年第1期657卷 462-469页

作者： D. Hughes R. Zoughi R. Austin N. Wood R. Engelbart 1Applied Microwave Nondestructive Testing Laboratory (amntl) Electrical and Computer Engineering Department University of Missouri ‐ Rolla Rolla MO 65409 2Texas Research Institute Austin Inc. (TRI/Austin) Austin TX 78733 3Automated Systems Business Unit Aerospace Support Systems The Boeing Company St. Louis MO 63166 4Nondestructive Evaluation Phantom Works The Boeing Company St. Louis MO 63166

Detection of corrosion precursor pitting on metallic surfaces under various coatings and on bare metal is of keen interest in evaluation of aircraft fuselage. Near‐field microwave nondestructive testing methods, utilizing open‐ended rectangular waveguides and coaxial probes, have been used extensively for detection of surface flaws in metals, both on bare metal and under a dielectric coating. This paper presents the preliminary results of using microwave techniques to detect corrosion precursor pitting under paint and primer, applique and on bare metal. Machined pits of 500 μm diameter were detected using open‐ended rectangular waveguides at V‐Band under paint and primer and applique, and on bare metal. Using coaxial probes, machined pits with diameters down to 150 μm on bare metal were also detected. Relative pit size and density were shown on a corrosion‐pitted sample using open‐ended rectangular waveguides at frequencies of 35 GHz to 70 GHz. The use of Boeing’s MAUS™ scanning systems provided improved results by alleviating standoff variation and scanning artifact. Typical results of this investigation are also presented.

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Human systems integration and advanced technology in engineering department workload and manpower reduction

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NAVAL ENGINEERS JOURNAL 2003年第1期115卷 57-65页

作者： Lively, KA Seman, AJ Kirkpatrick, M KENNETH A. LIVELY graduated from the University of Colorado with a BS in applied mathematics and an MS in mathematics in 1976 and from the Massachusetts Institute of Technology with an MS in electrical engineering and the degree ocean engineer in naval architecture and marine engineering in 1984. He retired from the U.S. Navy in 1989 after 23 years of service. Assignments included electrical officer on the USS Constellation (CV 64) project engineer for the DDG 51 machinery control system (NAVSEA) and DDG 51 Technical Director (NAVSEA). He was vice president of the PDI Division of Bird-Johnson Company from July 1989 to November 1998 where he managed various gas turbine and machinery controls related development projects. He joined Anteon Corporation's Systems Engineering Group as senior controls engineer in December 1998 where he provided technical support to the integrated power systems program (NAVSEA PMS 510) and managed the Office of Naval Research Afloat Laboratory. DR. MARK KIRKPATRICK is currently an independent consultant in human factors and work-load/manning analysis and modeling. He holds a Ph.D. degree in experimental psychology from The Ohio State University and has 34 years of experience in applied human factors. From 1982 through 2000 Dr. Kirkpatrick served as the senior vice president of Carlow International. Prior to joining Carlow in 1982 Dr. Kirkpatrick served as a member of the technical staff at North American Rockwell's Missiles Division and as a project director and vice president for Essex Corporation. His areas of expertise include workload simulation task analysis operator-in-the-loop simulation human performance experimentation statistical analysis and human factors T&E. He has directed and/or participated in human factors projects for the U.S. Navy U.S. Army NASA Department of Transportation the U.S. Nuclear Regulatory Commission and private industry. ANTHONY J. SEMAN III is the technical manager for the reduced ship's crew by virtual presence (RSVP) advanced technology d

Aboard current ships, such as the DDG 51, engineering control and damage control activities are manpower intensive. It is anticipated that, for future combatants, the workload demand arising from operation of systems under conditions of normal steaming and during casualty response will need to be markedly reduced via automated monitoring, autonomous control, and other technology initiatives. Current DDG 51 class ships can be considered as a manpower baseline and under Condition III typical engineering control involves seven to eight watchstanders at manned stations in the Central Control Station, the engine rooms and other machinery spaces. In contrast to this manning level, initiatives such as DD 21 and the integrated engineering plant (IEP) envision a partnership between the operator and the automation system, with more and more of the operator's functions being shifted to the automation system as manning levels decrease. This paper describes some human systems integration studies of workload demand reduction and, consequently, manning reduction that can be achieved due to application of several advanced technology concepts. Advanced system concept studies in relation to workload demand are described and reviewed including. Piecemeal applications of diverse automation and remote control technology concepts to selected high driver tasks in current DDG 51 activities. Development of the reduced ship's crew by virtual presence system that will provide automated monitoring and display to operators of machinery health, compartment conditions, and personnel health. The IEP envisions the machinery control system as a provider of resources that are used by various consumers around the ship. Resource needs and consumer priorities are at all times dependent upon the ship's current mission and the availability of equipment pawnbrokers.

关键词： Naval warfare

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Telemedicine: Future Promise for Dialysis Management

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Seminars in Dialysis 2002年第1期12卷

作者： James F. Winchester Betty Levine Jeff Collmann Kevin A. Schulman Jeanine W. Turner Saif Rathore Nasib Khanafer Adil Alaoui Neela Pania Arwa Al-Awaa Lance Hoffman Marisa Hofilena Seong K. Mun Department of Medicine Georgetown University Medical Center Washington D.C. Department of Radiology Imaging Science and Information Systems Center Georgetown University Medical Center Washington D.C. Clinical Economics Research Unit Georgetown University Medical Center Washington D.C. School of Engineering and Applied Science Institute on Computer and Telecommunications Systems Policy George Washington University Washington D.C.

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