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Learning relational rule from examples that are neither positive nor negative

Systems and computers in Japan 2001年第14期32卷 34-40页

作者： Ichise, Ryutaro Numao, Masayuki Knowledge Systems Research Intelligent Systems Research Division National Institute of Informatics Tokyo 101-8430 Japan Department of Computer Science Graduate School of Information Science and Engineering Tokyo Institute of Technology Tokyo 152-8552 Japan

Over the past decade, several inductive logic programming (ILP) systems have been developed. However, the normal ILP system does not have enough power to induce logic programs in some domains. Therefore, various new ILP systems, such as nonmonotonic ILP, that apply new learning tasks, have been proposed. In the present paper, a new learning task, called relational learning from nondichotomizable examples, is proposed for relational domains. The scheme of this task is similar to that of normal ILP, with the exception of the training examples. Normally, conventional ILP uses positive and negative examples in the training process. However, the examples of the proposed learning task are not strictly positive or negative: the training examples have a continuous scale. This new learning task is defined and a new method for learning this task is proposed. A new ILP system, SYNGIP (for SYNthesized system using Genetic programming and Inductive logic Programming), is developed based on this method and the performance of SYNGIP is compared experimentally to that of the conventional ILP method for the task of human feeling acquisition. © 2001 Scripta Technica, Syst. Comp. Jpn.

关键词： Logic programming

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Fast content-based search of VRML models based on shape descriptors

Fast content-based search of VRML models based on shape desc...

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IEEE International Conference on Image Processing

作者： L. Kolonias D. Tzovaras S. Malassiotis M.G. Strintzis Information Processing Laboratory Electrical and Computer Engineering Department Aristotle University of Thessaloniki Thessaloniki Greece Center for Research and Technology Hellas Informatics and Telematics Institute Thessaloniki Greece

Thepaper proposes a novel method for content-based search in a database of VRML 3D models. The proposed technique is based on a querying-by-3D-model approach. A set of shape-based descriptors are extracted from the reference 3D model and compared to the corresponding descriptors of the VRML models contained in the database. The descriptors used vary from simple geometric measurements such as the aspect ratio or a binary 3D shape mask to more complex and sophisticated shape-based criteria such as the edge paths of each 3D model. Similarity measures are then introduced for the specific descriptors and introduced into a 3D model-matching algorithm. Experimental results are presented, evaluating the performance of the proposed method.

关键词： Shape measurement Solid modeling Spatial databases Content based retrieval Iterative algorithms Information processing Laboratories Data engineering Data mining computer networks

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Fundamental components for the realization of a federated Integrated Electronic Health Record environment

Fundamental components for the realization of a federated In...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： D.G. Katehakis S. Sfakianakis M. Tsiknakis S.C. Orphanoudakis Institute of Computer Science Center of Medical Informatics and Health Telematics Applications (CMI-HTA) Greece Foundation for Research and Technology-Hellas (FORTH) Institute of Computer Science (ICS) Department of Computer Science University of Crete Heraklion Crete Greece

The Integrated Electronic Health Record (I-EHR) is a term used to describe the whole set of information that exists in electronic form and is related to the personal health of an individual. Any approach towards I-EHR focuses on the needs of professionals or citizens who want a uniform way of accessing parts of personal health record information that is physically located in disparate information sources. Any I-EHR end-user environment must provide fast, secure and authorized access to the distributed fragments of the electronic patient record (EPR) originating at multiple clinical information systems, and to deliver them in a multitude of formats. The importance of such an environment becomes apparent when used in conjunction with a number of advanced telematic services, such as medical collaboration, home care monitoring, and/or health emergency services, to provide seamless care without visible organizational boundaries.

关键词： Medical services Clinical diagnosis Telematics computer science Biomedical informatics Application software Paramagnetic resonance Liver Patient monitoring Biomedical monitoring

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An architecture for integrated regional health telematics networks

An architecture for integrated regional health telematics ne...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： D.G. Katehakis M. Tsiknakis S.C. Orphanoudakis Center of Medical Informatics and Health Telematics Applications (CMI-HTA) Foundation for Research and Technology-Hellas (FORTH) Institute for Computer Science Greece Department of Computer Science University of Crete Crete Greece

Healthcare is usually delivered within certain organizational boundaries and information produced at each site is managed by isolated autonomous clinical information systems. In some cases point-to-point communication is enabled, facilitating the exchange of information. In contrast, integrated regional health telematics; networks enable accessibility to information and services without visible organizational boundaries, to provide decentralized healthcare through integrated services for seamless and personalized information delivery. This has the advantage that enables informed citizens to have an impact on the healthcare system and to be more concerned and care for their own health. The current vision comprises affordable access to healthcare resources and services for all citizens, thus making medical expertise a shared resource wherever and whenever needed. Important areas in which information society technologies are likely to have a significant impact include those of pre-hospital health emergencies, remote monitoring of patients with chronic conditions, and medical collaboration through sharing of health-related information resources. Accessibility to these and other media-rich, user-oriented. services, in the context of the emerging global information society, will be supported by a healthcare information infrastructure, which can achieve effective horizontal integration of networked information sources.

关键词： Telematics Medical services computer science Clinical diagnosis Collaboration computer architecture Biomedical informatics Application software Isolation technology Electronic mail

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A Web adaptive educational system for people with hearing difficulties

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Education and Information Technologies 2000年第3期5卷 189-200页

作者： Markellou, Penelope Rigou, Maria Sirmakessis, Spiros Tsakalidis, Athanasios Computer Engineering and Informatics Department Multimedia Graphics and GIS Lab. University of Patras Patras 26500 Greece Internet and Multimedia Technologies Research Unit Computer Technology Institute Patras 26221 61 Riga Feraiou Str. Greece

In this paper we present a web adaptive educational tool for the Greek Sign Language. The design and the implementation of the tool were partially funded by national bodies. The paper presents the architecture of the tool, in an abstract way and briefly describes its functionality. The interaction process followed is also presented. © 2000 Kluwer academic Publishers.

关键词： Architecture Hearing difficulties Interactive learning Sign language

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2-D Spatial indexing scheme in optimal time

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East-European Conference on Advances in Databases and Information Systems Held Jointly with International Conference on Database Systems for Advanced Applications, ADBIS-DASFAA 2000

作者： Kitsios, Nectarios Makris, Christos Sioutas, Spyros Tsakalidis, Athanassios Tsaknakis, Jhon Vassiliadis, Bill Department of Computer Engineering and Informatics: Graphics Multimedia and GIS Laboratory University of Patras Patras26500 Greece Computer Technology Institute: Research Unit 5 P.O. Box 1122 Patras26110 Greece

ISBN: (纸本)3540679774

We consider the 2-dimensional space with integer coordinates in the range [1, N] × [1, N]. We present the MPST (Modified Priority Search Tree) index structure which reports the k points that lie inside the quadrant query range (, b] × (, c] in optimal O(k) time. Our Index Scheme is simple, fast and it can be used in various geometric or spatial applications such as: (1) 2 D dominance reporting on a grid (2) 2D maximal elements on a grid. Then, based on structures of Gabow et al. [6] and Beam and Fich [31] we describe an index scheme, which handles in an efficient way window queries in spatial database applications. In the general case in which the plane has real coordinates the above time results are slowed down by adding a logarithmic factor due to the normalization technique. © Springer-Verlag Berlin Heidelberg 2000.

关键词： Query languages

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The role of multiple, linear-projection based visualization techniques in RBF-based classification of high dimensional data

The role of multiple, linear-projection based visualization ...

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International Joint Conference on Neural Networks (IJCNN)

作者： A. Agogino J. Ghosh S.J. Perantonis V. Virvilis S. Petridis P.J.G. Lisboa Laboratory for Artificial Neural Systems Department of Electrical and Computer Engineering University of Texas Austin Austin TX USA National Center for Scientific Research Demokritos Institute of Informatics and Telecommunications Athens Greece School of Computing and Mathematical Sciences Liverpool John Moores University Liverpool UK

The paper presents a method for the 3D visualization of the structure of radial basis function networks using traditional and novel methods of dimensionality reduction. This method allows the visualization of basis function characteristics (centers and widths) along with second level weights. To facilitate the interpretation of a wide variety of high dimensional problems, several forms of projections into 20 or 30 spaces can be used interactively. The traditional methods of principal component analysis and Fisher's linear discriminant are used as well as a novel linear projection method.

关键词： Data visualization Radial basis function networks Neural networks World Wide Web Bonding Training data Laboratories informatics Uniform resource locators Telecommunication computing

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A distributed tool for commitment specification and management

A distributed tool for commitment specification and manageme...

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25th EUROMICRO Conference on informatics: Theory and Practice for the New Millennium, EUROMICRO 1999

作者： Tarhan, Ayca Demirors, Elif Demirors, Onur Dokuz Eylul University Department of Computer Engineering Bornova Izmir Turkey Bilgi Group Software Education Research and Consultancy Ankara Turkey Middle East Technical University Informatics Institute Ankara Turkey

ISBN: (纸本)0769503217

The need for specifying and managing commitments is supported by many elements in software development, such as project plans tracking systems, and process reviews. Commitment structure in organizations are so large, distributed, and complex that it can be coped with only via appropriate environments and tools. This paper proposes a distributed tool with its notation for commitment specification and management. Distributed Commitment Management Tool (DCMT) enables every single software developer to specify her commitments while modelling her own process in cooperation with others, and to manage her commitments based on the knowledge obtained via this modelling. The findings of the DCMT constitute valuable information not only for detecting and resolving unmet commitments and also for providing basic project management items, such as work breakdown structure, to-do-lists, and expect lists. © 1999 IEEE.

关键词： Specifications

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A co-operative environment for local government: an Internet–Intranet approach

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Telematics and informatics 1999年第1-2期16卷 75-89页

作者： Christos Bouras Panagiotis Destounis John Garofalakis Vassilis Triantafillou Giannis Tzimas Panagiotis Zarafidis Computer Technology Institute (CTI) 3 Kolokotroni St. 262 21 Patras Greece Computer Engineering and Informatics Department University Patras 26500 Patras Greece

In this paper we present a Web-based, database oriented CSCW system to support information dispersal between different Local Government authorities (Region, Prefecture and Municipalities) and the citizens. The system is implemented around the `shared workspace' notion, a group of directories and files controlled by the users of the workspace. Intranet and Extranet technologies are exploited to enable asynchronous and synchronous co-operation, manipulation of information from heterogeneous sources, security and easy administration, providing in parallel advanced communication facilities. We propose an innovative approach for the development of shared workspaces over WWW, based on state-of-the-art software platforms, integrating WWW and database technologies. The whole system was developed under a project funded by the Greek General Secretariat of research and technology and aims in the efficient distribution and management of information between and within different types of local authorities (Municipalities, Prefectures).

关键词： WWW Intranets Extranets CSCW Shared workspace Dynamic web pages

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On training piecewise linear networks

On training piecewise linear networks

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IEEE Workshop on Neural Networks for Signal Processing

作者： A. Atiya E. Gad S. Shaheen A. El-Dessouky Department of Electrical Engineering CalTech Pasadena CA USA Department of Electrical Engineering Carleton University Ottawa Canada Department of Computer Engineering Cairo University Giza Egypt Informatics Research Institute MCSRTA Alexandria Egypt

Piecewise-linear (PWL) neural networks are networks with piecewise-linear node functions. They have attractive features, such as speed of training and amenability to digital VISI implementation. The paper presents an algorithm for training PWL networks. The algorithm is general in that it can be used for the optimization of general PWL functions. It is based on moving from one linear region to the next. This is achieved by exploring 2N specific directions along the boundaries between the linear regions (N is the dimension), and moving along the direction that achieves a descent in the objective function. Convergence to the local minimum is proved, and simulation results confirm the computational efficiency of the algorithm.

关键词： Piecewise linear techniques Neural networks Backpropagation algorithms Very large scale integration Convergence computer networks informatics Computational modeling Computational efficiency Upper bound

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