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Towards pragmatic patterns for clinical knowledge management 07

Towards pragmatic patterns for clinical knowledge management

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2nd International Conference on the Pragmatic Web: "Building Common Ground on the Web", ICPW '07

作者： Falkman, Göran Gustafsson, Marie Jontell, Mats Torgersson, Olof School of Humanities and Informatics University of Skövde P.O. Box 408 SE-541 28 Skövde Sweden Dept. of Computer Science and Engineering Chalmers University of Technology SE-412 96 Göteborg Sweden Institute of Odontology Sahlgrenska Academy Göteborg University P.O. Box 450 SE-405 30 Göteborg Sweden Dept. of Computer Science and Engineering Göteborg University SE-412 96 Gteborg Sweden

ISBN: (纸本)9781595938596

We present a research program for identifying, modeling, and making use of generic pragmatic patterns for clinical knowledge management that support evidence-based medicine (EBM). Part of this program is SOMWeb, a system based on Semantic Web technologies, which is used for knowledge sharing and dissemination within an oral medicine community. A study of the use of SOMWeb has been conducted as the first step in the elicitation of important contextual factors and communicative activities involved in knowledge sharing processes in oral medicine. One such activity, community discussion activation, is described using consultation patterns together with the collaboration patterns of [5]. The general need for context-aware health information systems and the prospective use of approaches within Pragmatic Web in the pursuit of EBM are also discussed. Copyright 2007 ACM.

关键词： Semantic Web

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Word sense disambiguation using inductive logic programming

Word sense disambiguation using inductive logic programming

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16th International Conference of Inductive Logic Programming, ILP 2006

作者： Specia, Lucia Srinivasan, Ashwin Ramakrishnan, Ganesh Das Graças Volpe Nunes, Maria ICMC University of São Paulo Trabalhador São-Carlense 400 São Carlos 13560-970 Brazil IBM India Research Laboratory Indian Institute of Technology Block 1 New Delhi 110016 India Dept. of Computer Science and Engineering Centre for Health Informatics University of New South Wales Sydney Australia

ISBN: (纸本)9783540738466

The identification of the correct sense of a word is necessary for many tasks in automatic natural language processing like machine translation, information retrieval, speech and text processing. Automatic Word Sense Disambiguation (WSD) is difficult and accuracies with state-of-the art methods are substantially lower than in other areas of text understanding like part-of-speech tagging. One shortcoming of these methods is that they do not utilize substantial sources of background knowledge, such as semantic taxonomies and dictionaries, which are now available in electronic form (the methods largely use shallow syntactic features). Empirical results from the use of Inductive Logic Programming (ILP) have repeatedly shown the ability of ILP systems to use diverse sources of background knowledge. In this paper we investigate the use of ILP for WSD in two different ways: (a) as a stand-alone constructor of models for WSD;and (b) to build interesting features, which can then be used by standard model-builders such as SVM. In our experiments we examine a monolingual WSD task using the 32 English verbs contained in the SENSEVAL-3 benchmark data;and a bilingual WSD task using 7 highly ambiguous verbs in machine translation from English to Portuguese. Background knowledge available is from eight sources that provide a wide range of syntactic and semantic information. For both WSD tasks, experimental results show that ILP-constructed models and models built using ILP-generated features have higher accuracies than those obtained using a state-of-the art feature-based technique equipped with shallow syntactic features. This suggests that the use of ILP with diverse sources of background knowledge can provide one way for making substantial progress in the field of automatic WSD. © Springer-Verlag Berlin Heidelberg 2007.

关键词： Logic programming

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Immediate Mode Scheduling of Independent Jobs in Computational Grids

Immediate Mode Scheduling of Independent Jobs in Computation...

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International Conference on Advanced Information Networking and Applications (AINA)

作者： Fatos Xhafa Leonard Barolli Arjan Durresi Polytechnic University of Catalonia Dept. of Languages and Informatics Systems Campus Nord Barcelona Spain EngineeringDept. of Information and Communication Fukuoka Institute of Technology (FIT) Fukuoka Japan Dept. of Computer Science Louisiana State University Baton Rouge LA

With the emerging paradigm of grid computing and the development of grid infrastructures, grid-based applications are becoming a common approach for solving many complex, large-scale problems in science and engineering. In order to benefit from the large computing power of grid systems, efficient allocation of jobs to resources is necessary. In this work, we consider the allocation problem in immediate mode, in which jobs are allocated as soon as they arrive in the system. We implemented several methods and measured four parameters of the system: makespan, flow- time, resource utilization and matching proximity. The immediate methods are especially interesting when good quality allocations are necessary in very short time. The considered methods have been tested using the most difficult benchmark in the literature for the problem. The computational results allowed us to identify which of considered methods perform better for makespan, flowtime, resource utilization and matching proximity. Also, we were able to evaluate the usefulness of such methods if we knew in advance certain grid characteristics such as degree of consistency of computing, heterogeneity of jobs and resources.

关键词： Processor scheduling Grid computing Resource management Distributed computing Large-scale systems Benchmark testing Load management informatics computer science Application software

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Multimodal fusion for cued Speech language recognition

Multimodal fusion for cued Speech language recognition

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European Signal Processing Conference (EUSIPCO)

作者： Savvas Argyropoulos Dimitrios Tzovaras Michael G. Strintzis Aristotle University of Thessaloniki Thessaloniki GR Informatics and Telematics Institute Centre for Research and Technology Hellas Thermi-Thessaloniki Hellas Electrical and Computer Engineering Dept. Aristotle University of Thessaloniki Thessaloniki Hellas

In this paper, a novel method for Cued Speech language recognition is proposed. A multimodal processing framework is developed for the efficient fusion of the modalities under consideration. The robust feature extraction from the audio, lip shape and gesture modalities is also discussed. Moreover, the inherent correlation among the signals is modelled using a modified Coupled Hidden Markov Model. The contribution of each modality to the fused decision is modified by assessing its reliability and assigning a weighting factor to improve the accuracy of the recognized words. The method is experimentally evaluated and is shown to outperform methods that rely only on the perceivable information to infer the transmitted messages.

关键词： Speech recognition Shape Speech Hidden Markov models Feature extraction Reliability Gesture recognition

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Using a Grid Platform for Enabling Real Time User Modeling in On-line Campus

Using a Grid Platform for Enabling Real Time User Modeling i...

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International Conference on Complex, Intelligent and Software Intensive Systems, CISIS

作者： Santi Caballe Fatos Xhafa Thanasis Daradoumis Joan Esteve Leonard Barolli Arjan Durresi Universitat Oberta de Catalunya Barcelona Catalunya ES Dept. of Languages and Informatics Systems Polytechnic University of Catalonia Barcelona Spain Department of Computer Science Multimedia and Telecommunication Open University of Catalonia Barcelona Spain Department of Information and Communication Engineering Fukuoka Institute of Technology (FIT) Higashi-ku Fukuoka Japan Department of Computer Science Louisiana State University Baton Rouge LA USA

User modelling in on-line distance learning is an important research field focusing on two important aspects: describing and predicting students' actions and intentions as well as adapting the learning process to students' features, habits, preferences, and so on. The aim is to greatly stimulate and improve the learning experience. Indeed, on the one hand, students' intentions may change during the realization of learning activities and thus their actions evolve accordingly as the learning process moves forward. On the other hand, adaptive systems can effectively plan and design appropriate learning tasks according to students' features, habits and interests with the aim of facilitating the achievement of the learning goal. In this context, user modelling implies a continuous processing and analysis of user interaction data during long-term learning activities, which produces large and considerably complex information. As a consequence, processing this information is costly and could require computational capacity beyond that of a single computer. In this paper, we show how a grid approach can considerably decrease the processing time of log data of on-line distance educational Web-based systems. Our prototype is based on the master-worker paradigm and is implemented using a peer-to-peer platform running on the Planetlab nodes. The results of our study show the feasibility of using grid middleware to speed and scale up the processing of log data and thus achieve an efficient and dynamic user modeling in on-line distance learning

关键词： computer aided instruction Adaptive systems computer science Predictive models Context modeling Information analysis Peer to peer computing Software systems Application software Usability

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PastryStrings: A comprehensive content-based publish/subscribe DHT network

PastryStrings: A comprehensive content-based publish/subscri...

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26th IEEE Internationa26th IEEE International Conference on Distributed Computing Systems, ICDCS 2006

作者： Aekaterinidis, Ioannis Triantafillou, Peter RA Computer Technology Institute Dept. of Computer Engineering and Informatics University of Patras Greece

ISBN: (纸本)0769525407

In this work we propose and develop a comprehensive infrastructure, coined PastryStrings, for supporting rich queries on both numerical (with range, and comparison predicates) and string attributes, (accommodating equality, prefix, suffix, and containment predicates) over DHT networks utilising prefix-based routing. As event-based, publish/subscribe information systems are a champion application class, we formulate our solution in terms of this environment. © 2006 IEEE.

关键词： Distributed computer systems

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Utilizing infrared pattern recognition features for indoor localization validated by future position restrictions

Utilizing infrared pattern recognition features for indoor l...

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2nd IET International Conference on Intelligent Environments, IE 06

作者： Petrellis, Nikos Konofaos, Nikos Alexiou, George Computer Engineering and Informatics Dept. Research Academic Computer Technology Institute University of Patras Greece

ISBN: (纸本)0863416632

In this paper we present a system that is capable of estimating the position of a moving target on a grid plane covered by a pair of infrared transmitters. The area of this plane can be up to 15m2, further expandable if multiple transmitters are used. The position estimation method is based on comparing the number of infrared patterns received to the expected ones in a specific time interval (success rate). Using this method, no signal strength or time of flight has to be precisely measured, leading to an ultra low cost architecture. A proper topology of the infrared transmitters that optimally cover the desired area is discussed. The history of movements of the target is utilized in order to reject false estimations. The error achieved is below the half of the grid node distance.

关键词： Feature extraction

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Evaluating different one to many packet delivery schemes for UMTS 06

Evaluating different one to many packet delivery schemes for...

引用

WoWMoM 2006: 2006 International Symposium on a World of Wireless, Mobile and Multimedia Networks

作者： Alexiou, Antonios Antonellis, Dimitrios Bouras, Christos Research Academic Computer Technology Institute Greece Computer Engineering and Informatics Dept. Univ. of Patras Greece

ISBN: (纸本)0769525938

It is known that multicasting is an efficient method of supporting group communication as it allows the transmission of packets to multiple destinations using fewer network resources. Thus, service providers are increasingly interested in supporting multicast communications over wireless networks and in particular over UMTS. Multicasting is a more efficient method of supporting group communication than unicasting or broadcasting, as it allows transmission and routing of packets to multiple destinations using fewer network resources. In this paper the three above mentioned methods of supporting group communication are analyzed in terms of their performance. © 2006 IEEE.

关键词： Packet networks

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An active contour model guided by LBP distributions

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8th International Conference on Advanced Concepts for Intelligent Vision Systems, ACIVS 2006

作者： Savelonas, Michails A. Iakovidis, Dimitris K. Maroulis, Dimitris E. Karkanis, Stavros A. Dept. of Informatics and Telecommunications University of Athens 15784 Athens Greece Dept. of Informatics and Computer Technology Lamia Institute of Technology 3rd Kilometer Old National Road 35100 Lamia Greece

ISBN: (纸本)3540446303

The use of active contours for texture segmentation seems rather attractive in the recent research, indicating that such methodologies may provide more accurate results. In this paper, a novel model for texture segmentation is presented, combining advantages of the active contour approach with texture information acquired by the Local Binary Pattern (LBP) distribution. The proposed LBP scheme has been formulated in order to capture regional information extracted from distributions of LBP values, characterizing a neighborhood around each pixel, instead of using a single LBP value to characterize each pixel. The log-likelihood statistic is employed as a similarity measure between the LBP distributions, resulting to more detailed and accurate segmentation of texture images. © Springer-Verlag Berlin Heidelberg 2006.

关键词： Image segmentation

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Design aspects of open municipal broadband networks 06

Design aspects of open municipal broadband networks

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1st International Conference on Access Networks, AcessNets '06

作者： Alexiou, Antonios Bouras, Christos Primpas, Dimitrios Research Academic Computer Technology Institute Computer Engineering and Informatics Dept. Univ. of Patras N. Kazantzaki Str 26500 Rio Greece

ISBN: (纸本)1595935134

This paper presents the design principles that cover the implementation of broadband infrastructure in the region of Western Greece, by examining all the necessary parameters that arise while implementing such a critical developmental project. Furthermore, we present as a case study, all issues of the designing of the Metropolitan Area Network of Patras, the third biggest city of Greece. The major target of the MAN of Patras is to interconnect the buildings of the public sector in the city and also deploy fibers that will create conditions of competition in providing both access and content services in advantage of the end consumer. The usage of the broadband infrastructure by service providers will be based on the open availability of the fiber optics infrastructure in a cost effective way. Finally, we present the main characteristics of a proposed business plan that ensures financial viability of the broadband infrastructure. Copyright 2006 ACM.

关键词： Broadband networks

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