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Proceedings of the 2003 Joint Workshop on Foundations of Mobile Computing, DIALM-POMC 2003

作者： Floréen, Patrik Kaski, Petteri Kohonen, Jukka Orponen, Pekka Helsinki Inst. for Info. Technology Basic Research Unit P.O. Box 26 FIN-00014 Helsinki Finland Lab. for Theor. Computer Science P.O. Box 5400 FIN-02015 Helsinki Finland

ISBN: (纸本)1581137656

We consider the problem of maximizing the lifetime of a given multicast connection in a wireless network of energy-constrained (e.g. battery-operated) nodes, by choosing ideal transmission power levels for the nodes relaying the connection. We distinguish between two basic operating modes: In a static assignment, the power levels of the nodes are set at the beginning and remain unchanged until the nodes are depleted of energy. In a dynamic assignment, the powers can be adjusted during operation. We show that lifetime-maximizing static power assignments can be found in polynomial time, whereas for dynamic assignments, a quantized-time version of the problem is NP-hard. We then study the approximability of the quantized dynamic case and conclude that no polynomial time approximation scheme (PTAS) exists for the problem unless P = NP. Finally, by considering two approximation heuristics for the dynamic case, we show experimentally that the lifetime of a dynamically maintained multicast connection can be made several times longer than what can be achieved by the best possible static assignment.

关键词： Wireless telecommunication systems

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CITATION: semantics-based information modeling for the healthcare administration sector

CITATION: semantics-based information modeling for the healt...

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IEEE EMBS International Conference on Information technology Applications in Biomedicine (ITAB)

作者： G.C. Sakellaris A.G. Anagnostakis M. Tzima D.I. Fotiadis A. Likas Unit of Medical Technology & Intelligent Information Systems Department of Computer Science University of Ioannina and Biomedical Research Institute Ioannina Greece

The CITATION system implements an information brokerage environment for effective information structuring, indexing and retrieval in the healthcare administration sector. CITATION incorporates the latest evolvements in the fields of ontology modeling, natural language processing, XML documents self-describing features, semantics analysis and behavioral description to allow for seamless and personalized information delivery and for adequate representation of the semantics of the existing healthcare administrative information content.

关键词： Medical services Ontologies Information retrieval Natural language processing Indexing Data mining Vocabulary XML Information analysis Natural languages

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Rule discovery and probabilistic modeling for onomastic data

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7th European Conference on Principles and Practice of Knowledge Discovery in Databases, PKDD 2003

作者： Leino, Antti Mannila, Heikki Pitkänen, Ritva Liisa Helsinki Institute for Information Technology Basic Research Unit Department of Computer Science University of Helsinki P.O. Box 26 FIN-00014 Finland Research Institute for the Languages of Finland Sörnäisten rantatie 25 HelsinkiFIN-00500 Finland Helsinki University of Technology Laboratory of Computer and Information Science P.O. Box 5400 HutFIN-02015 Finland University of Helsinki Department of Finnish University of Helsinki P.O. Box 3 FIN-00014 Finland

ISBN: (纸本)3540200851

The naming of natural features, such as hills, lakes, springs, meadows etc., provides a wealth of linguistic information;the study of the names and naming systems is called onomastics. We consider a data set containing all names and locations of about 58,000 lakes in Finland. Using computational techniques, we address two major onomastic themes. First, we address the existence of local dependencies or repulsion between occurrences of names. For this, we derive a simple form of spatial association rules. The results partially validate and partially contradict results obtained by traditional onomastic techniques. Second, we consider the existence of relatively homogeneous spatial regions with respect to the distributions of place names. Using mixture modeling, we conduct a global analysis of the data set. The clusterings of regions are spatially connected, and correspond quite well with the results obtained by other techniques;there are, however, interesting differences with previous hypotheses. © Springer-Verlag Berlin Heidelberg 2003.

关键词： Lakes

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PLACEBO: a computational platform for health professionals and bioengineers

PLACEBO: a computational platform for health professionals a...

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

作者： F. Vartziotis D.I. Fotiadis I.E. Lagaris A. Likas Unit of Medical Technology and Intelligent Information Systems Department of Computer Science University of Ioannina (UoI) Ioannina Greece Department of Computer Science University of Ioannina and Biomedical Research Institute FORTH Ioannina Greece

In this article, we present PLACEBO, an innovative software and hardware platform, which intends to solve biomedical problems formulated in terms of partial differential equations. It can be networked with various imaging devices, such as MRI and CT and can be used for pre-operative surgical planning. It employs an effective computational environment for solving partial differential equations, which is based on neural networks. This approach, in order to exploit the parallel character of the neural networks, is implemented partly in specialized hardware hosted on a commercial PC. There are two operation levels. A user-level, targeting health professionals that need to solve a set of predefined biomedical problems, and a bioengineering level, which allows the construction of problem sets. Since ease of use is of paramount importance for these kind of platforms, a friendly graphical user-interface is being developed.

关键词： Biomedical computing Partial differential equations Neural networks Biomedical imaging Magnetic resonance imaging Computed tomography Surgery computer networks Neural network hardware Biomedical engineering

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CHILDCARE: a collaborative environment for the monitoring of children healthcare at home

CHILDCARE: a collaborative environment for the monitoring of...

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IEEE EMBS International Conference on Information technology Applications in Biomedicine (ITAB)

作者： K. Starida G. Ganiatsas D.I. Fotiadis A. Likas Unit of Medical Technology and Intelligent Information Systems Department of Computer Science University of Ioannina and Biomedical Research Institute FORTH Ioannina Greece

This paper provides an overview of the concept, the functionalities and the architecture of the CHILDCARE platform. The CHILDCARE system aims at supporting the out-of-hospital continuous healthcare management of chronically ill children. Special focus is placed on the utilization of the latest technology accomplishments towards the incorporation of teleconference sessions, collaborative spaces and intelligent add-ons over a common secure platform. This combination allows for: (a) remote communication between health experts and the child's family, (b) efficient collaboration between the responsible doctor and healthcare professionals, (c) interfacing legacy hospital information systems to obtain health records, (d) set-up, execution and monitoring of health management plans, (e) ubiquitous access from multiple devices, (f) role-based management of the actors with respect to their actual involvement in the healthcare process, (g) confidentiality and security at all levels.

关键词： Pediatrics Collaboration Medical services Space technology Health information management Teleconferencing Hospitals Management information systems Remote monitoring Information security

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Using XML and controlled vocabularies to achieve unambiguous knowledge acquisition from multiple heterogeneous medical data sources

Using XML and controlled vocabularies to achieve unambiguous...

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IEEE EMBS International Conference on Information technology Applications in Biomedicine (ITAB)

作者： K.M. Kontaxis G.C. Sakellaris D.I. Fotiadis Unit of Medical Technology and Intelligent Information Systems Department of Computer Science University of Ioannina and Biomedical Research Institute FORTH Ioannina Greece

In this paper we describe an innovative system that aims to integrate heterogeneous distributed healthcare information resources. It is based on the advantages of technologies like the extensible markup language (XML), controlled vocabularies (CVs) such as wordnet and the unified medical language system (UMLS), as well as the common object request broker architecture (CORBA). The proposed approach is based on three key functionalities: a) the user-transparent acquisition of each source's structural information, b) the lexical and semantical analysis based elaboration of the user's initial query and c) the appropriate combination of the results from the two previous functionalities, aiming to the selection of the query that corresponds with each source. CORBA is responsible for providing the interoperability between objects in this disparate distributed environment.

关键词： XML Vocabulary Knowledge acquisition Medical services Medical control systems Unified modeling language Information retrieval Intelligent systems Information systems computer science

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An intelligent system for the provision of personalized dietary plans and health monitoring

An intelligent system for the provision of personalized diet...

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IEEE EMBS International Conference on Information technology Applications in Biomedicine (ITAB)

作者： I. Antoniou T. Nanou D. Fotiadis A. Likas Unit of Medical Technology and Intelligent Information Systems Department of Computer Science University of Ioannina and Biomedical Research Institute FORTH Ioannina Greece

We present an intelligent web-based system, called h-Life, which addresses the monitoring and improvement of health and lifestyle through the provision of customized dietary plans. Additional plan-related services including monitoring, alerting, reminding and evaluation, complement the functionality of the h-Life system. Several innovative components are integrated in order to efficiently manage the storage, access and retrieval of medical and personal data. Based on the latest technologies in intelligent and communication systems, the system provides the user with personalized dietary plans and lifestyle information, tailored to the individual needs. The h-Life system is based on a scalable and interoperable architecture that can be easily extended to accommodate future needs. Apart from a personal health assistant for the end-users, h-Life is a valuable tool for the health professionals that can remotely monitor their customers and manage the medical knowledge utilized by the system.

关键词： Intelligent systems Biomedical monitoring computerized monitoring Logic Medical services Databases Information retrieval Remote monitoring Patient monitoring Cardiovascular diseases

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An efficient system for the detection of arrhythmic segments in ECG recordings based on non-linear features of the RR interval signal

An efficient system for the detection of arrhythmic segments...

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computers in Cardiology (CinC)

作者： M.G. Tsipouras D.I. Fotiadis Unit of Medical Technology and Intelligent Information Systems Dept of Computer Science University of Ioannina and Biomedical Research Institute FORTH Ioannina Greece

In this paper we explore the RR interval signal to detect arrhythmic segments in electrocardiograms (ECG) using non-linear analysis. Initially, the RR interval signal is extracted and it is segmented into small segments. Linear (standard deviation), spectral (total energy) and non-linear (approximated entropy and normalized entropy) characteristics are extracted for each segment. Time-frequency analysis is used for the calculation of the total energy. These characteristics are fed into a neural network to classify each segment as normal or arrhythmic. The proposed approach is validated using the MIT-BIH database for various segment sizes (32, 64, 128, 256 and 512 RR intervals). The method results in high sensitivity and specificity (85% sensitivity and 92% specificity) for arrhythmic segment detection.

关键词： Electrocardiography Entropy Signal analysis Neural networks Algorithm design and analysis Medical signal detection Time frequency analysis Rhythm Feature extraction Heart

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Three-dimensional coronary artery reconstruction using fusion of intravascular ultrasound and biplane angiography

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International Congress Series 2003年第C期1256卷 1133-1138页

作者： Bourantas, C. Fotiadis, D.I. Kourtis, I.C. Michalis, L.K. Plissiti, M. Department of Cardiology Medical School University of Ioannina GR 45110 Ioannina Greece Department of Computer Science Unit of Medical Technology and Intelligent Information Systems University of Ioannina GR 45110 Ioannina Greece Biomedical Research Institute-FORTH GR 45110 Ioannina Greece Michailideion Cardiology Center GR 45110 Ioannina Greece

We have developed an efficient method for 3D reconstruction of coronary arteries. Our approach is based on the fusion of intravascular ultrasound (IVUS) and biplane angiography. The method includes an efficient algorithm for the automatic identification of the regions of interest in IVUS images and a novel methodology for the extraction of the catheter path from biplane angiographies. The estimation of IVUS frames relative twist and the computation of first IVUS frame absolute orientation is also investigated. To assess the performance of the method, a validation procedure is introduced. Several metrics are obtained to verify the reliability of our method in the description of coronary artery morphology. © 2003, Elsevier B.V. All rights reserved.

关键词： 3D artery reconstruction Biplane angiography Deformable models Intravascular ultrasound

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Effort drivers in maintenance outsourcing-an experiment using Taguchi's methodology

Effort drivers in maintenance outsourcing-an experiment usin...

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(CSMR) European Conference on Software Maintenance and Reengineering

作者： B.S. Rao N.L. Sarda Unit No. 112 SDF IV Seepz Syntel Mumbai India Department of Computer Science & Engineering Indian Institute of Technology Mumbai India

We establish the context of software maintenance outsourcing of large commercial systems and discuss the problem of estimating the maintenance effort in absence of key parameters such as development effort and maintenance history. To arrive at the drivers that could have a significant effect on the maintenance effort, an experiment was conducted at Syntel, a NASDAQ listed application management and e-business solutions company. We present the list of possible drivers, the profile of the people who participated in the experiment, the details of the 36 experiments and the statistical analysis of the experiment based on Taguchi's methodology. For a system whose size parameter in terms of lines of code is known, we conclude that the five most significant parameters that effect the efforts of maintenance are a)the multi time zone support, b)average number of lines per program, c)percentage of online programs in the total system, d)the nature of service level agreements and e)the complexity of the file system being used.

关键词： Outsourcing Software maintenance Application software Costs History Business Companies Hardware computer science Statistical analysis

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