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IEEE International Conference on Image Processing

作者： N. Voisine S. Dasiopoulou F. Precioso V. Mezaris I. Kompatsiaris M.G. Strintzis Informatics and Telematics Institute Centre for Research and Technology Hellas Thessaloniki Greece Information Processing Laboratory Electrical and Computer Engineering Department Aristotle University of Thessaloniki Thessaloniki Greece

Efficient video content management and exploitation requires extraction of the underlying semantics, a non-trivial task associating low-level features of the image domain and high-level semantic descriptions. In this paper, a knowledge-assisted approach for extracting semantics of domain-specific video content is presented. Domain knowledge considers both low-level features (color, motion, shape) and spatial behavior (topological and directional information). During the preprocessing step, a set of over-segmented homogenous atom-regions is generated and their low-level and spatial descriptions are extracted. A genetic algorithm is then applied in order to find the optimal interpretation according to a specific domain conceptualization. The proposed approach was tested on the formula one, tennis and beach vacations domains showing promising results.

关键词： Algorithm design and analysis Data mining Ontologies Genetic algorithms Object detection Content management Feature extraction Knowledge representation Semantic Web Laboratories

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Fault Diagnosis of Hybrid Systems

Fault Diagnosis of Hybrid Systems

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IEEE International Symposium on Intelligent Control (ISIC)

作者： G.K. Fourlas K.J. Kyriakopoulos N.J. Krikelis Department of Informatics and Computer Technology Technological Educational Institute (TEI) of Lamia Lamia Greece Control Systems Laboratory Mechanical Engineering Department National and Technical University of Athens Athens Greece

Fault diagnosis is a challenging task in the control of hybrid systems. In this work we present a methodology for detection and isolation of faults to hybrid control systems using a diagnoser. For this purpose a general framework is proposed. We discuss the notion of diagnosability of hybrid systems in the framework of hybrid input output automata (HIOA), imposing the conditions for a hybrid system to be diagnosable. The diagnoser is designed using hybrid structure hypothesis tests. The states of the hybrid system model reflect the normal and the failed status of the system components. This approach is applicable to a wide range of real systems since hybrid systems involve both continuous and discrete dynamics

关键词： Fault diagnosis Control systems Automatic control Power system dynamics Fault detection Automata Testing Power system reliability Power system management Hybrid power systems

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An e-learning system for improving learner study efficiency by stimulating learner volition

An e-learning system for improving learner study efficiency ...

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International Conference on Parallel and Distributed Systems (ICPADS)

作者： S. Takahama N. Nakamura L. Barolli A. Koyama A. Durresi K. Sugita Graduate School of Engineering Fukuoka Institute of Technology Fukuoka Japan Department of Information and Communication Engineering Fukuoka Institute of Technology Fukuoka Japan Department of Informatics Faculty of Engineering Yamagata University Yonezawa Yamagata Japan Department of Computer Science Louisiana State University Baton Rouge LA USA

Due to the opportunities provided by the Internet, more and more people are taking advantage of distance learning courses and during the last few years enormous research efforts have been dedicated to the development of distance learning systems. So far, many e-learning systems are proposed and used practically. However, in these systems the e-learning completion rate is about 30 percents. One of the reasons is the low study desire when the learner studies the learning materials. In this research, we propose an e-learning system, which includes three subsystems: the learning subsystem, learner support subsystem, and teacher support subsystem. The learning subsystem improves the learners study desire. The learner support subsystem supports the learner during the study, and the teacher support subsystem support the teacher to get the learner's study state. In the future work, we would like to add other functions to improve more the system performance.

关键词： Electronic learning computer aided instruction Electronic mail Internet computer science education informatics computer science System performance Control systems Costs

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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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Application of policing mechanisms for broadband networks: issues and difficulties

Application of policing mechanisms for broadband networks: i...

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International Conference on Advanced Information Networking and Applications (AINA)

作者： T. Gouda L. Barolli K. Sugita A. Koyama A. Durresi G. De Marco Fukuoka Institute of Technology Graduate School of Engineering Fukuoka Japan Department of Information and Communication Engineering Fukuoka Institute of Technology Fukuoka Japan Department of Informatics Yamagata University Yonezawa Yamagata Japan Department of Computer Science Louisiana State University Baton Rouge LA USA

Networks of today are passing through a rapid evolution. The broadband ISDN (B-ISDN), which offers a wide variety of telecommunication services, is considered to be a powerful future network, which can satisfy the demands of users and the network providers. Even the network speed is increased very fast and by using DWDM technology the Terabit/s speed is possible in the near future, the costumers request are increasing and new multimedia applications which need large bandwidth will appear in the future. For this reason control of user traffic will be very important to keep the quality of service (QoS) of other already established connections by detecting violations of negotiated parameters and taking appropriate actions. In this paper we propose a fuzzy policing mechanism (FPM) for multimedia applications. We consider the case of still picture source control. The performance evaluation via simulation shows that the FPM efficiently controls the mean cell rate of the still picture source. We will extend this study for other multimedia applications such as video sources.

关键词： Broadband communication B-ISDN Communication system traffic control Electronic mail Quality of service Wavelength division multiplexing Traffic control Telecommunication services Bandwidth Bit rate

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New E-learning tools for DC-DC converters

New E-learning tools for DC-DC converters

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2005 European Conference on Power Electronics and Applications

作者： Hamar, J. Funato, H. Ogasawara, S. Nagy, I. Ogasawara and Funato Laboratory Dept. of Electrical and Electronic Engineering Utsunomiya University 7-1-2 Yoto Utsunomiya-shi Tochigi 321-8585 Japan Budapest University of Technology and Economics Department of Automation and Applied Informatics Goldmann György tér 3 H-1111 Budapest Hungary Computer and Automation Institute Hungarian Academy of Sciences Hungary

ISBN: (纸本)9075815085

The paper gives an overview of the Yoto project, a novel e-learning initiative to build up an electrical engineering knowledge base. It also presents a new e-module of the project relating to the steady-state operation of dc-dc converters. The multimedia rich module contains numerous interactive tools promoting the high level education in the academy sector and the vocational trainings in the industry. The interactive tools also highly support the circuit design process by enabling fast calculation and access to relevant circuit quantities and waveforms (voltages and currents) in steady-state without long simulations.

关键词： DC-DC converters

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Dynamic response measurement of clinical gas analysers

Dynamic response measurement of clinical gas analysers

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Annual IEEE Symposium on computer-Based Medical Systems

作者： K. Shakya C. Deegan F. Hegarty C. Markham School of Informatics and Engineering Institute of Technology Blanchardstown Ireland Department of Medical Physics and BioEngineering Saint James''s Hospital Dublin Ireland Department of Computer Science National University of Ireland Maynooth Ireland

Capnographs are devices that use CO/sub 2/ from a patients' expired breath to monitor the cardiopulmonary status during anaesthesia and mechanical ventilation. The waveforms are called capnograms. Capnographs at present are routinely calibrated via a static calibration method only. There is no specific method of dynamically testing capnographs. Since capnograms are time varying, there is a definite requirement to evaluate the dynamic response of these systems. This paper presents a technique to determine the time and frequency response of capnographs using a custom built EtCO/sub 2/ simulator system. This system is computer controlled via a C program. A portable version of the simulator system has also been developed using a microprocessor. The waveforms obtained using the simulator system are recorded and image analysis is performed using Matlab to obtain the time and frequency responses of the capnographs. This paper explains the image analysis part of the technique in detail. Measurements of several types of capnograph systems proved that older capnographs usually do not satisfy the manufacturer quoted specifications for time and frequency response. Monitoring capnographs on a routine basis is thus important and is recommended. This new technique of time and frequency response measurement can be used as part of a quality control protocol for capnographs; for commissioning and routine monitoring as well as to verify manufacturer quoted specifications in new units.

关键词： Time factors Frequency response Computational modeling Image analysis Frequency measurement Time measurement Manufacturing Patient monitoring Cardiology Ventilation

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A CAC scheme for multimedia applications based on fuzzy logic

A CAC scheme for multimedia applications based on fuzzy logi...

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International Conference on Advanced Information Networking and Applications (AINA)

作者： L. Barolli M. Durresi K. Sugita A. Durresi A. Koyama Department of Information and Communication Engineering Fukuoka Institute of Technology Fukuoka Japan Franklin University Columbus OH USA Department of Computer Science Louisiana State University Baton Rouge LA USA Department of Informatics Yamagata University Yonezawa Japan

The purpose of admission control is to support the quality of service (QoS) demands of real time applications via resource reservation. In order to deal with admission control for high-speed networks, in a previous work we proposed a fuzzy based admission control scheme, which is flexible and adaptive and makes an intelligent decision for call acceptance. In the previous work, we considered only two indicators for QoS and congestion control. However, for multimedia applications more QoS and CC parameters should be considered. In this paper, we extend our previous work by proposing two additional schemes, which are integrated in the previous scheme. The new scheme is called fuzzy admission control for multimedia applications (MFAC). In this paper, we introduce the conventional admission control schemes and give some simulation results of their performance. We explain the proposed MFAC scheme and present the design of fuzzy QoS controller (FQC) and Fuzzy congestion controller (FCC). The performance of the new scheme and the comparison with conventional ones is for the future work.

关键词： Fuzzy logic Quality of service Admission control Fuzzy control High-speed networks Adaptive control Programmable control Neural networks Intelligent networks Communication system traffic control

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Geometric containers for efficient shortest-path computation

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ACM Journal of Experimental Algorithmics 2005年 10卷 1.3–es页

作者： Wagner, Dorothea Willhalm, Thomas Zaroliagis, Christos Institut für Theoretische Informatik Universität Karlsruhe (TH) Postfach 6980 Karlsruhe 76128 Germany Computer Technology Institute P.O. Box 1122 Patras 26110 Greece Department of Computer Engineering and Informatics University of Patras Patras 26500 Greece

A fundamental approach in finding efficiently best routes or optimal itineraries in traffic information systems is to reduce the search space (part of graph visited) of the most commonly used shortest path routine (Dijkstra's algorithm) on a suitably defined graph. We investigate reduction of the search space while simultaneously retaining data structures, created during a preprocessing phase, of size linear (i.e., optimal) to the size of the graph. We show that the search space of Dijkstra's algorithm can be significantly reduced by extracting geometric information from a given layout of the graph and by encapsulating precomputed shortest-path information in resulted geometric objects (containers). We present an extensive experimental study comparing the impact of different types of geometric containers using test data from real-world traffic networks. We also present new algorithms as well as an empirical study for the dynamic case of this problem, where edge weights are subject to change and the geometric containers have to be updated and show that our new methods are two to three times faster than recomputing everything from scratch. Finally, in an appendix, we discuss the software framework that we developed to realize the implementations of all of our variants of Dijkstra's algorithm. Such a framework is not trivial to achieve as our goal was to maintain a common code base that is, at the same time, small, efficient, and flexible, as we wanted to enhance and combine several variants in any possible way. © 2005 ACM.

关键词： Data structures and algorithms Dijkstra's algorithm Geometric container Graph algorithms Shortest path Traffic network

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New e-learning tools for DC-DC converters

New e-learning tools for DC-DC converters

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European Conference on Power Electronics and Applications

作者： J. Hamar H. Funato S. Ogasawara I. Nagy Ogasawara & Funato Laboratory Department of Electrical and Electronic Engineering Utsunomiya University Utsunomiya Tochigi Japan Department of Automation and Applied Informatics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary Computer and Automation Institute Hungarian Academy of Sciences (ATOMKI) Hungary

The paper gives an overview of the Yoto project, a novel e-learning initiative to build up an electrical engineering knowledge base. It also presents a new e-module of the project relating to the steady-state operation of DC-DC converters. The multimedia rich module contains numerous interactive tools promoting the high level education in the academy sector and the vocational trainings in the industry. The interactive tools also highly support the circuit design process by enabling fast calculation and access to relevant circuit quantities and waveforms (voltages and currents) in steady-state without long simulations

关键词： Electronic learning DC-DC power converters Humans Steady-state Laboratories informatics Automation Business computer science education Electrical engineering

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