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Case-based reasoning combined with statistics for diagnostics and prognosis

Journal of Physics: Conference Series 2012年第1期364卷

作者： T Olsson P Funk School of Innovation Design and Engineering Mälardalen University SE-721 23 Västerås Sweden Industrial Applications and Methods Lab Swedish Institute of Computer Science (SICS) SE-164 29 Kista Sweden

Many approaches used for diagnostics today are based on a precise model. This excludes diagnostics of many complex types of machinery that cannot be modelled and simulated easily or without great effort. Our aim is to show that by including human experience it is possible to diagnose complex machinery when there is no or limited models or simulations available. This also enables diagnostics in a dynamic application where conditions change and new cases are often added. In fact every new solved case increases the diagnostic power of the system. We present a number of successful projects where we have used feature extraction together with case-based reasoning to diagnose faults in industrial robots, welding, cutting machinery and we also present our latest project for diagnosing transmissions by combining Case-Based Reasoning (CBR) with statistics. We view the fault diagnosis process as three consecutive steps. In the first step, sensor fault signals from machines and/or input from human operators are collected. Then, the second step consists of extracting relevant fault features. In the final diagnosis/prognosis step, status and faults are identified and classified. We view prognosis as a special case of diagnosis where the prognosis module predicts a stream of future features.

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Exploring wiki: Measuring the quality of social media using ant colony metaphor 11

Exploring wiki: Measuring the quality of social media using ...

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International Conference on Management of Emergent Digital EcoSystems, MEDES'11

作者： Banerjee, Soumya El-Bendary, Nashwa Al-Qaheri, Hameed Department of Computer Science Birla Institute of Technology Mesra India Arab Academy for Science Technology Maritime Transport P.O. Box 12311 Giza Egypt Department of Quantitative Methods and Information Systems College of Business Administration Kuwait University Kuwait

ISBN: (纸本)9781450310475

This paper proposes a novel bio-inspired model that quantifies the quality aspect of Wiki content. Unlike the statistical measures, the proposed system automates the quality dispersion mechanism using ant colony's pheromone artifacts over Wiki content. The inclusion of artificial ant agents is relevant to the heuristic behavior of Wiki content management and reputation paradigm of Wiki. The proposed model generates substantial empirical and graphical evidences, which could be timely boosted to enhance Wiki culture and editing process of Wiki in order to be theoretically trusted and validated across the users. Observed results present evidences that despite of users' attribution, registered or anonymous, the proposed agent based model provides quantifying editing in content of Wiki and accordingly both commercial viability, in terms of quality, and vandalism can be ensured. Copyright © 2011 ACM.

关键词： Ant colony optimization

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A complete gradient clustering algorithm

A complete gradient clustering algorithm

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3rd International Conference on Artificial Intelligence and Computational Intelligence, AICI 2011

作者： Kulczycki, Piotr Charytanowicz, Malgorzata Systems Research Institute Polish Academy of Sciences Center for Stochastic Data Analysis Methods Newelska 6 PL-01-447 Warsaw Poland Cracow University of Technology Department of Automatic Control and Information Technology Cracow Poland Catholic University of Lublin Institute of Mathematics and Computer Science Lublin Poland

ISBN: (纸本)9783642238956

A gradient clustering algorithm, based on the nonparametric methodology of statistical kernel estimators, expanded to its complete form, enabling implementation without particular knowledge of the theoretical aspects or laborious research, is presented here. The possibilities of calculating tentative optimal parameter values, and then - based on illustrative interpretation - their potential changes, result in the proposed Complete Gradient Clustering Algorithm possessing many original and valuable, from an applicational point of view, properties. Above all the number of clusters is not arbitrarily imposed but fitted to a real data structure. It is also possible to increase the scale of the number (still avoiding arbitrary assumptions), as well as the proportion of clusters in areas of dense and sparse situation of data elements. The method is universal in character and can be applied to a wide range of practical problems, in particular from the bioinformatics, management and engineering fields. © 2011 Springer-Verlag.

关键词： Clustering algorithms

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Hierarchical Fuzzy Signatures approach for a piloted quality management system

Hierarchical Fuzzy Signatures approach for a piloted quality...

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IEEE SSD International Multi-Conference on Systems, Signals and Devices

作者： Hajer Ben Mahmoud Raouf Ketata Taieb Ben Romdhane Samir Ben Ahmed National Institute of Applied Science and Technology (INSAT) Research units on Intelligent Control design and Optimisation of Complex System ICOS Corporation Tunisia National Institute of Applied Science and Technology INSAT Tunisia Research units on Methods and tools for Complex Computer Systems MOSIC Tunisia

There are many areas where objects with very complex and sometimes interdependent features are to be classified; similarities and dissimilarities are to be evaluated. This makes a complex decision model difficult to construct effectively. This paper presents a Hierarchical Fuzzy Signatures (HFS) approach for improving the effectiveness and efficiency of quality-management system (QMS). The goal is to classify the objectives for a real-world case study. The latter was chosen because it presents a major problem for controlling the quality levels of its production lines. With the use of this fuzzy signature structure, complex decision models in the quality management field should be able to be constructed more effectively. In fact, this study provides a path for designing a tool for decision support to ensure the effectiveness of a corporate QMS.

关键词： Companies Quality management Biological system modeling Computational modeling Production Availability ISO standards

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PREFACE

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International Journal of Foundations of computer science 2011年第2期22卷 275-276页

作者： VOLKER DIEKERT DIRK NOWOTKA Institute for Formal Methods in Computer Science Universität Stuttgart Universitätsstr. 38 70569 Stuttgart Germany

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EEG phase synchronization and information flow during audio-visual stimulation

EEG phase synchronization and information flow during audio-...

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2010 3rd International Symposium on Applied sciences in Biomedical and Communication Technologies, ISABEL 2010

作者： Teplan, Michal Paluš, Milan Vejmelka, Martin Dept. of Theoretical Methods Institute of Measurement Science SAS Bratislava Slovakia Dept. of Nonlinear Modelling Institute of Computer Science CAS Praha Czech Republic

ISBN: (纸本)9781424481323

Phase synchronization and directionality of human EEG data recorded under influence of audio-visual stimulation were investigated. EEG data came from 6 healthy volunteers repeatedly exposed to 20 min stimulation that comprised intervals with steady stimulation at 4 and 17 Hz. Entrainment of the brain waves and phase synchronization both significantly increased during the stimulation in comparison to nonstimulating conditions accross the whole cortex. Positive correlation of entrainment and phase synchronization was obtained. Directionality analysis suggests that applied methods may estimate direction of information flow from visual processing centers towards frontal cortex locations. ©2010 IEEE.

关键词： Synchronization

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Hierarchical Random Graph Model for Off-line Handwritten Signatures Recognition

Hierarchical Random Graph Model for Off-line Handwritten Sig...

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

作者： Marcin Piekarczyk Institute of Computer Science and Computer Methods Pedagogical University of Cracow Krakow Poland

The article presents the approach based on the usage of syntactic methods for the static analysis of handwritten signatures. The graph linguistic formalisms applied, such as the IE graph and ETPL(k) grammar, are characterised by considerable descriptive strength and a polynomial membership problem of the syntactic analysis. For the purposes of representing the analysed handwritten signatures, new hierarchical (two-layer) HIE graph structures based on IE graphs have been defined. The two-layer graph description makes it possible to take into consideration both local and global features of the signature. The usage of attributed graphs enables the storage of additional semantic information (in the form of a set of parameters) describing the properties of individual signature strokes. Information about the shapes of specimen signatures is presented in the form of a language based on random IE graphs and stochastic class ETPL(k) grammars, which makes it possible to take into consideration the natural variability of the shape of specimen signatures. The verification and recognition of a signature consists in analysing the affiliation of its graph description to the language describing the specimen database. Initial assessments display a precision of the method at a average level of about 17%.

关键词： Handwriting recognition Shape Polynomials Stochastic processes Hidden Markov models Biometrics Contracts Image converters Competitive intelligence Software systems

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Artificial Intelligence methods for Understanding Dynamic computer Tomography Perfusion Maps

Artificial Intelligence Methods for Understanding Dynamic Co...

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

作者： Tomasz Hachaj Institute of Computer Science and Computer Methods Pedagogical University of Cracow Krakow Poland

In this article author presents novel approach for analyzing the meaning of brain perfusion maps generated with dynamic computer tomography treatment. With these methods it is possible to detect (if exists), describe position, measure, and state prognosis for brain tissues that are affected by ischemic or hemorrhagic lesions. The whole process is driven by number of image processing algorithms, medical knowledge about average perfusion values and knowledge about interpretation of visualized symptoms. The methods was implemented and tested on 75 triplets of medical images acquired from 30 different adult patients (man and woman) with suspicious of ischemia / stroke. Each triplet was consisted of perfusion CBF and CBV map and ¿plain¿ CT image (one of the image from perfusion treatment acquired before contrast arrival became visible). The algorithm response was compared to image description done to each case by radiologist. The hypothesis to verify was if there is any lesions in perfusion map and if the algorithm found correct position, description and prognosis for them (if the algorithm give a wrong answer for any of this condition the case was considered as ¿error¿). Total error rate (the proportion of error instances to all instances) of full automatic detection (without manual correction of position of brain symmetry axis) was 48.0% and total error rate of semi automatic detection results (with correction of position of brain symmetry axis) was 22.7%.

关键词： Artificial intelligence Tomography Lesions Biomedical imaging Error analysis Position measurement Hemorrhaging Image processing Visualization Medical tests

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Decision support systems in transport logistics

Decision support systems in transport logistics

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作者： Abramov, Alexander L. Kovtaniuk, Alexandra A. Mathematics and Computer Science Institute Far Eastern National University 27 Oktyabrskaya St. Vladivostok 690600 Russia Mathematics and Computer Science Institute Far Eastern National University Graduate of Faculty Mathematical Methods in Economy 27 Oktyabrskaya St. Vladivostok 690600 Russia

In this paper problems of transport logistics focused on organization of optimal transportation and storage of resources and products are discussed. These problems were reduced to the knapsack and bin packing problems. Different heuristic approaches for the mentioned problems are analyzed. The architecture of the decision support system containing the subsystem for solving optimal cargo loading problems on bases of the algorithms is present.

关键词： Decision support systems

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Towards Distributed and Adaptive Detection and Localisation of Network Faults

Towards Distributed and Adaptive Detection and Localisation ...

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Advanced International Conference on Telecommunications (AICT)

作者： Rebecca Steinert Daniel Gillblad Industrial Applications and Methods Lab (IAM) Swedish Institute of Computer Science Kista Sweden

ISBN: (纸本)9781424467488;9780769540214

We present a statistical probing-approach to distributed fault-detection in networked systems, based on autonomous configuration of algorithm parameters. Statistical modelling is used for detection and localisation of network faults. A detected fault is isolated to a node or link by collaborative fault-localisation. From local measurements obtained through probing between nodes, probe response delay and packet drop are modelled via parameter estimation for each link. Estimated model parameters are used for autonomous configuration of algorithm parameters, related to probe intervals and detection mechanisms. Expected fault-detection performance is formulated as a cost instead of specific parameter values, significantly reducing configuration efforts in a distributed system. The benefit offered by using our algorithm is fault-detection with increased certainty based on local measurements, compared to other methods not taking observed network conditions into account. We investigate the algorithm performance for varying user parameters and failure conditions. The simulation results indicate that more than 95% of the generated faults can be detected with few false alarms. At least 80% of the link faults and 65% of the node faults are correctly localised. The performance can be improved by parameter adjustments and by using alternative paths for communication of algorithm control messages.

关键词： Fault detection Probes Testing Delay estimation Parameter estimation Collaboration Costs Performance evaluation Communication industry computer industry

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