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IEEE International Conference on Systems, Man, and Cybernetics

作者： Osamu Sugiyama Katsutoshi Itoyama Kazuhiro Nakada Hiroshi G. Okuno Graduate School of Information Science and Engineering Tokyo Institute of Technology Graduate School of Informatics Kyoto University Grad. Sch. of Inf. Science and Engineering Honda Research Institute Japan Co. Ltd Graduate Program for Embodiment Informatics Waseda University

With the rise of inexpensive microphone array products and the robot audition software called HARK, we can record and analyze multidirectional sound sources easily. The combination of microphone array and the software enables us to separate, localize, and track multidirectional sound sources. Most of the solutions for accessing these separated sound source information provide clients for interpreting simplified information about the separated sources, but not to directly execute the semantic annotations. Since the multidirectional sound annotation requires simultaneous labeling of separated sound sources and a multidirectional overview of the sources, it is essential to have an efficient way of annotation and an intuitive view of multidirectional sounds. Our proposed sound annotation tool provides drag & drop operation of annotation with a 3D sound source view and also provides annotation autocompletion with a SVM trained with the user's annotation history. The proposed features enable users to do the annotation task intuitively and confirm its result. We also conducted an evaluation demonstrating the efficiency of annotation done using the tool.

关键词： Accuracy Orbits Software Three-dimensional displays Microphones Support vector machines Robots

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Electrical equivalent circuit of ceramics insulators with RTV Silicone Rubber coated and computer simulation of leakage current

Electrical equivalent circuit of ceramics insulators with RT...

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International Conference on Electrical engineering and informatics, ICEEI

作者： Fari Pratomosiwi Suwarno School of Electrical Engineering and Informatics Institut Teknologi Bandung Bandung INDONESIA Sch. of Electr. Eng. & Inf. Inst. Teknol. Bandung Bandung Indonesia

During operation, high voltage insulators may severe a certain degree of pollution which may reduce their performances such as surface resistance and flash over voltages. Under these conditions a large leakage current (LC) may flow on the surface and degradation may take place. The LC waveforms are normally non-pure sinusoidal. This is due to the non linear behaviour of insulator surface and in particular condition, electrical disch.rges take place which distort the leakage current waveform. The magnitude and the waveform of the leakage current correlate with the surface condition of outdoor insulators. The parameters were proposed as diagnostics tools for ceramic outdoor insulators with RTV silicone rubber coating. In order to improve the diagnostic tool and to deeply understand the behaviour of the leakage current on the outdoor insulators, it is important to investigate the parameters affect the leakage current. To understand the correlation between leakage current waveforms and electrical circuit parameter, we will, in this paper, proposed an equivalent electrical circuit model for modelling leakage current phenomenon on ceramic outdoor insulator with RTV silicone rubber coating under various environmental conditions. Proposed equivalent electrical circuit model consists of capacitor(s), non-linear resistor(s), and arc model(s). These three parameters will be used to simulate the LC waveforms of ceramic insulator with RTV silicone rubber coating under various environmental conditions using ATP/EMTP software package. The results showed the similarity between experimental and simulated LC waveforms. The simulated environmental conditions were clean sample.

关键词： Equivalent circuits Ceramics Dielectrics and electrical insulation Rubber Computer simulation Leakage current Surface disch.rges Surface resistance Surface contamination Coatings

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Solving a Realistic Location Area Problem Using SUMATRA Networks with the Scatter Search Algorithm

Solving a Realistic Location Area Problem Using SUMATRA Netw...

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International Conference on Intelligent Systems Design and Applications (ISDA)

作者： Sónia M. Almeida-Luz Miguel A. Vega-Rodríguez Juan A. Gómez-Pulido Juan M. Sánchez-Pérez Department of Informatics Engineering Sch. of Tech. and Mgmt. Polytechnic Institute of Leiria Leiria Portugal Department Technologies of Comp. and Communications Escuela Politécnica University of Extremadura Caceres Spain

This paper presents a new approach based on the scatter search (SS) algorithm applied to the location management problem using the location area (LA) sch.me. The LA sch.me is used to achieve the best configuration of the network partitioning, into groups of cells (location areas), that minimizes the costs involved. In this work we execute five distinct experiments with the aim of setting the best values for the scatter search parameters, using test networks generated with realistic data. We also want to compare the results obtained by this new approach with those achieved through classical strategies, other algorithms from our previous work and also by other authors. The simulation results show that this SS based approach is very encouraging.

关键词： Scattering Costs Mobile communication Partitioning algorithms Personal communication networks Intelligent systems Intelligent networks informatics Design engineering Algorithm design and analysis

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Optimizing Multiple Sequence Alignment by Improving Mutation Operators of a Genetic Algorithm

Optimizing Multiple Sequence Alignment by Improving Mutation...

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International Conference on Intelligent Systems Design and Applications (ISDA)

作者： Fernando José Mateus da Silva Juan Manuel Sánchez Pérez Juan Antonio Gómez Pulido Miguel A. Vega Rodríguez Department of Informatics Engineering Sch. of Tech. and Mgmt. Polytechnic Institute of Leiria Leiria Portugal Department Tecnologías Computadores y Comunicaciones Escuela Politécnica Universidad de Extremadura Caceres Spain

Searching for the best possible alignment for a set of sequences is not an easy task, mainly because of the size and complexity of the search space involved. Genetic algorithms are predisposed for optimizing general combinatorial problems in large and complex search spaces. We have designed a genetic algorithm for this purpose, AlineaGA, which introduced new mutation operators with local search optimization. Now we present the contribution that these new operators bring to this field, comparing them with similar versions present in the literature that do not use local search mechanisms. For this purpose, we have tested different configurations of mutation operators in eight BAliBASE alignments, taking conclusions regarding population evolution and quality of the final results. We conclude that the new operators represent an improvement in this area, and that their combined use with mutation operators that do not use optimization strategies, can help the algorithm to reach quality solutions.

关键词： Genetic mutations Genetic algorithms Sequences Evolution (biology) Bioinformatics Design optimization Testing RNA Space technology Intelligent systems

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Design and implementation of an end tidal CO2 simulator for the evaluation of clinical gas analysers

Design and implementation of an end tidal CO2 simulator for ...

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作者： Shakya, Kabita Deegan, Catherine Hegarty, Fran Markham, Charles Sch. of Informatics and Engineering Inst. of Technology Blanchardstown Dublin 2 Ireland Dept. of Med. Phys. and Bioeng. St. James's Hospital Dublin 2 Ireland Department of Computer Science National University of Ireland Maynooth Ireland

This paper presents a new technique to determine the dynamic and frequency response of capnographs using a custom built 'EtCO2 simulator system'. Capnographs are devices that use CO2 from a patients' expired breath to monitor the cardiopulmonary status during anaesthesia and mechanical ventilation. Capnographs at present are routinely calibrated via a static calibration method only. The dynamic response of the capnographs is not accounted for. The frequency and time response are important as they determine if capnographs can be used in high frequency and pediatric ventilation sch.mes. Experiments performed using the method described in this paper proved that old capnographs usually do not satisfy the manufacturer quoted specifications for time and frequency response. Therefore, a routine check for capnographs is recommended. The method can also be used to verify manufacturer quoted specifications. The EtCO2 simulator system, designed and constructed simulates human respiration cycle. The gas sources used are 5% CO2 and room air that can be switched alternatively. Both supplies are pressure regulated and connected through non-return valves to electric valves. The valves are microprocessor controlled and the on/off time is user defined allowing a wide range of waveforms to be simulated. The output from the simulator is delivered to capnograph. Capnograms are captured by digital video recording. The captured video in 'avi' file format is then converted into individual frames. These frames are converted into digital data through image processing in Matlab. The data obtained is subjected to extensive analysis to determine the frequency and time response of the respective capnograph. Copyright 2005 ISA. All Rights Reserved.

关键词： Biomedical equipment

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A novel shape descriptor based on empty morphological skeleton subsets

A novel shape descriptor based on empty morphological skelet...

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2004 International Symposium on Intelligent Multimedia, Video and Speech Processing, ISIMP 2004

作者： Namati, Eman Li, J. S. Jimmy Flinders University Sch. of Informatics and Engineering GPO Box 2100 Adelaide 5001 Australia

ISBN: (纸本)0780386884

In this paper a novel shape descriptor based on the empty morphological skeleton subsets is proposed. This new descriptor possesses many properties required for practical shape recognition i.e. it is non-specific, robust to scale, rotation and boundary variations. One advantage of the proposed descriptor is that the empty morphological skeleton subset pattern maybe used to distinguish different objects even with identical union of skeleton subsets. Implementation of this descriptor for recognition of objects has been successfully realized using Neural Networks.

关键词： Mathematical morphology

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Vibration control of a cantilever beam using adaptive resonant control

Vibration control of a cantilever beam using adaptive resona...

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2004 5th Asian Control Conference

作者： Tjahyadi, Hendra He, Fangpo Sammut, Karl Sch. of Informatics and Engineering Flinders University GPO Box 2100 SA 5001 Australia

ISBN: (纸本)0780388739

In this paper, an adaptive resonant controller is applied to attenuate vibrations in a cantilever beam structure with large varying parameters. This controller is particularly suited for structures that are exposed to previously unmodelled dynamics. On-line estimation of the structure's natural frequencies is used to up-date the resonant controller's parameters. Simulation results show that the proposed adaptive strategy can achieve better performances than its fixed-parameter counterpart.

关键词： Cantilever beams

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Mining relationships between interacting episodes

Mining relationships between interacting episodes

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Proceedings of the Fourth SIAM International Conference on Data Mining

作者： Mooney, Carl H. Roddick, John F. Sch. of Informatics and Engineering Flinders Univ. of South Australia PO Box 2100 Adelaide SA 5001 Australia

The detection of recurrent episodes in long strings of tokens has attracted some interest and a variety of useful methods have been developed. The temporal relationship between discovered episodes may also provide useful knowledge of the phenomenon but as yet has received little investigation. This paper discusses an approach for finding such relationships through the proposal of a robust and efficient search strategy and effective user interface both of which are validated through experiment.

关键词： Temporal Sequence Mining

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Radio direction finding for maritime search and rescue

Radio direction finding for maritime search and rescue

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2004 5th Asian Control Conference

作者： Pine, K. Evans, M.E. Sammut, K. He, F. Sch. of Informatics and Engineering Flinders University Adelaide Australia Def. Sci. and Technol. Organisation Edinburgh Australia

ISBN: (纸本)0780388739

Two Unmanned Aerial Vehicles (UAVs) are required to respond to a maritime emergency beacon, localise it, and then circle around it in an optimal configuration. Each UAV is able to measure bearing to the beacon but not its range. Novel guidance and control strategies based on cost function gradient search techniques are developed to achieve a continuous reduction in the estimate of the beacon location. Simulation studies reveal the localisation and circling behaviour achieved with the various cost functions, and a new minimum estimation error configuration is discovered. A direct cost function based on an 'area-of-uncertainty' metric achieved the best localisation considering flight and localisation time.

关键词： Unmanned vehicles

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MR pulse sequence selection for optimal display of acrylic polymer phantoms

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Radiography 2004年第3期10卷 177-182页

作者： Kurmis, Andrew P. Slavotinek, John P. Sch. of Informatics and Engineering Flinders University Adelaide SA 5001 GPO Box 2100 Australia Department of Medical Imaging Flinders Medical Centre Bedford Park SA 5042 Flinders Drive Australia

Purpose Acrylic phantoms are being increasingly used as an alternative to cadaveric and animal derived tissue samples in pre-clinical magnetic resonance (MR) imaging research studies. Such phantoms have been imaged using a variety of MR sequences but little effort has been devoted to determining the most appropriate MR pulse sequence. In order to address this question, a prospective comparative study was performed to determine which MR sequence optimally demonstrates acrylic polymer phantoms. Methods Nine MR imaging sequences were selected and used to image an acrylic phantom placed in a water bath. The mid-sagittal slice of each sequence was used to determine signal-to-noise (S/N) and contrast-to-noise (C/N) ratios. The signal intensity maximum gradient at the phantom/fluid interface was used as a measure of edge delineation. Results Of the nine sequences reviewed the T2 driven equilibrium pulse sequence (DRIVE), a 3D turbo spin echo (TSE) sequence, provided the highest S/N (72.88) and C/N (69.62) ratios, while the proton density (PD) TSE or intermediate T2 TSE sequences provided the best edge delineation (definition of the acrylic-fluid interface). Conclusion This study suggests that selection of MR pulse sequences when evaluating a submersed acrylic phantom is dependent on which information is most important to the researcher. If S/N and C/N are considered most important, of the nine MR sequences tested, the T2 DRIVE sequence may be best employed. If edge delineation is considered most important, then PD or intermediate T2 TSE sequences may be best employed. © 2004 The College of Radiographers. Published by Elsevier Ltd. All rights reserved.

关键词： Contrast separation Edge delineation Image assessment MR imaging

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