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8th European Conference on Speech Communication and technology, EUROSPEECH 2003

作者： Matsushita, Masahiko Nishizaki, Hiromitsu Utsuro, Takehito Kodama, Yasuhiro Nakagawa, Seiichi Dpt. Information Computer Sciences Toyohashi University of Technology Japan Dpt. Intelligence Science Technology Graduate School of Informatics Kyoto University Japan

This paper studies speech-driven Web retrieval models which accepts spoken search topics (queries) in the NTCIR-3 Web retrieval task. The major focus of this paper is on improving speech recognition accuracy of spoken queries then improving retrieval accuracy in speech-driven Web retrieval. We experimentally evaluate the techniques of combining outputs of multiple LVCSR models in recognition of spoken queries. As model combination techniques, we compare the SVM learning technique conventional voting schemes such as ROVER. We show that the techniques of multiple LVCSR model combination can achieve improvement both in speech recognition and retrieval accuracies in speech-driven text retrieval. We also show that model combination by SVM learning outperforms conventional voting schemes both in speech recognition retrieval accuracies.

关键词： Speech recognition

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Multiobjective optimization of the transport in oil pipelines networks

Multiobjective optimization of the transport in oil pipeline...

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2003 IEEE Conference on Emerging Technologies and Factory Automation, ETFA 2003

作者： De La Cruz, J.M. De Andres-Toro, B. Herran, A. Porta, E.B. Blanco, P.F. Dpt. Computer Architecture and Automatic Control Universidad Complutense de Madrid Madrid28040 Spain

ISBN: (纸本)0780379373

Heuristic methods are specially well suited to solve combinatorial problems. One of these problems is the distribution of petroleum products through oil pipelines networks. In this paper the problem is stated and solved using a multiobjective and constraint evolutionary optimization algorithm. Several objective functions has been defined to express the goals of the solutions as well as the preferences among them. Some constraints are included as hard objective functions and some has been evaluated through a repairing function to avoid infeasible solutions. An example of working is given. © 2003 IEEE.

关键词： Heuristic methods

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Confidence of agreement among multiple LVCSR models and model combination by SVM

Confidence of agreement among multiple LVCSR models and mode...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Takehito Utsuro Yasuhiro Kodama Tomohiro Watanabel Hiromitsu Nishizakil Seiichi Nakagawa Dpt. Intelligence Science and Technology Kyoto University Japan Dpt. Information and Computer Sciences Toyohashi University of Technology

ISBN: (纸本)0780376633

For many practical applications of speech recognition systems, it is quite desirable to have an estimate of confidence for each hypothesized word. Unlike previous works on confidence measures, we have proposed features for confidence measures that are extracted from outputs of more than one LVCSR models. For further analysis of the proposed confidence measure, this paper examines the correlation between each word's confidence and the word's features such as its part-of-speech and syllable length. We then apply SVM learning technique to the task of combining outputs of multiple LVCSR models, where, as features of SVM learning, information such as the pairs of the models which output the hypothesized word are useful for improving the word recognition rate. Experimental results show that the combination results achieve a relative word error reduction of up to 72 % against the best performing single model and that of up to 36 % against ROVER.

关键词： Support vector machines Speech recognition Automatic speech recognition Voting Length measurement Acoustic measurements Machine learning Informatics Application software Data mining

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A new ica method based on a lattice of the observation space

A new ica method based on a lattice of the observation space

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International Conference on Information Fusion

作者： M.R. Alvarez F. Rojas C.G. Puntonet F. Theis E.W. Lang Dpt. Architecture and Computer Technology. Univ Granada Spain Institute of Biophysics University Regensburg Germany

ISBN: (纸本)0972184457

This work shows a new method for blind separation of sources, based on geometrical considerations concerning the observation space. This new method is applied to a mixture of several sources and it obtains the estimated coefficients of the unknown mixture matrix A and separates the unknown sources. The principles of the new method and a description of the algorithm followed by some speed enhancements are shown. Finally, we illustrate with simulations of several source distributions how the algorithm performs.

关键词： Independent component analysis Lattices Signal processing algorithms Space technology Source separation Signal processing Vectors Stochastic processes Blind source separation computer architecture

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Multiobjective optimization of the transport in oil pipelines networks

Multiobjective optimization of the transport in oil pipeline...

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International Conference on Emerging Technologies and Factory Automation (ETFA)

作者： J.M. de la Cruz B. de Andres-Toro A. Herran E.B. Porta P.F. Blanco Dpt. Computer Architecture and Automatic Control Universidad Complutense de Madrid Madrid Spain

关键词： Intelligent networks Petroleum Pipelines Constraint optimization Evolutionary computation computer architecture Automatic control Fuel economy Refining Transportation

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A deformable model-based visual system for mobile robot topologic navigation

A deformable model-based visual system for mobile robot topo...

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Proceedings 2003 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS 2003) (Cat. No.03CH37453)

作者： M. Mata J.M. Armingol A. de la Escalera F.J. Rodriguez Computer Architecture and Automation Dpt. Universidad Europea de Madrid Madrid Spain Systems Engineering and Automation Dpt. Universidad Carlos III de Madrid Madrid Spain

Deformable models have been intensively studied in image analysis through the last decade, and are used for detection and recognition of flexible or rigid templates under diverse viewing conditions. Genetic algorithm (GA) based deformable models are used for generic visual landmark detection and interpretation. The developed system allows topologic localization and navigation using natural and artificial landmarks, exploiting deformable models' ability for handling landmark perspective variations. The resulting perception module has been integrated successfully in a complex navigation system. Various experimental results in real environments are presented on this paper, showing the effectiveness and capacity of the landmark detection and reading system.

关键词： Deformable models Visual system Mobile robots Navigation Robotics and automation Image recognition Object detection Object recognition Uncertainty Image motion analysis

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CAVT - A Congestion Avoidance Visualization Tool

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computer Communication Review 2003年第3期33卷 96-101页

作者： Welzl, Michael Mühlhäuser, Max Leopold Franzens University of Innsbruck Institute of Computer Science Technikeretr. 25/7 A-6020 Innsbruck Austria Darmstadt University of Technology Dpt. of Computer Science Telecooperation Alexanderstr. 6 D-64283 Darmstadt Germany

We present CAVT, a simple yet powerful tool to visualize the behavior of congestion control mechanisms. Essentially being a simulator that builds upon the well-known Chiu/Jain vector diagrams, CAVT provides researcher... 详细信息

关键词： Congestion control (communication)

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Virtual Vessel Reconstruction from a Fragment's Profile

Virtual Vessel Reconstruction from a Fragment's Profile

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4th International Symposium on Virtual Reality, Archaeology and Intelligent Cultural Heritage, VAST 2003

作者： Kampel, M. Melero, F.J. Vienna University of Technology Institute of Computer Aided Automation Pattern Recognition and Image Processing Group Favoritenstr. 9 183-2 ViennaA-1040 Austria Universidad de Granada E.T.S. Ingeniería Informática Dpt. Lenguajes y Sistemas Informáticos C/. Daniel Saucedo Aranda s/n GranadaE-18071 Spain

ISBN: (纸本)3905673088

Every archaeological excavation must deal with a vast number of ceramic fragments. The documentation, administration and scientific processing of these fragments represent a temporal, personnel, and financial problem. Up to now documentation and classification have been done manually which means a lot of routine work for archaeologists and a very inconsistent representation of the real object. First, there may be errors in the measuring process (diameter or height may be inaccurate). Second, the drawing of the fragment should be in a consistent style, which is not possible since a drawing of an object without interpreting it is very hard to do. We are developing a documentation system for archaeological fragments based on their profile, which is the cross-section of the fragment in the direction of the rotational axis of symmetry. Hence the position of a fragment (orientation) on a vessel is important, since it allows a good profile to be obtained. This paper presents two different approaches to the estimation of the orientation of archaeological fragments and the profile extraction. One method is based on a Hough inspired approach and the other is based on genetic algorithms and expert interaction. We compare the methods and show results with respect to robustness, applicability, and accuracy. © The Eurographics Association 2003.

关键词： Genetic algorithms

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A digital optical-fiber finger blood volume meter

A digital optical-fiber finger blood volume meter

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IEEE Instrumentation and Measurement technology Conference

作者： J.N. Lygouras K.N. Tarchanidis P.G. Tsalides Dpt. of Electrical and Computer Engineering Democritus University of Thrace Xanthi Greece Dpt. of Petroleum Technology Kavala Institute of Technology and Education Kavala Greece

ISBN: (纸本)0780366468

This paper presents a technique to design a digital optical-fiber photoplethysmograph. This noninvasive method is based on the measurement of the intensity of an infrared-light beam, which penetrates the index finger. Digital techniques are used to produce the transmitted signal and to demodulate the received signal. Optical fibers are used to transfer the light to and from the sampling point. Frequency analysis of the peripheral volume pulse-wave signal is performed off-line. The power content in the harmonics of this pulse wave may be a useful measure of aging and vascular disease.

关键词： Fingers Blood Optical pulses Pulse measurements Optical design Optical design techniques Optical fibers Sampling methods Frequency Signal analysis

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Spline-type solution to parameter-dependent LMIs

Spline-type solution to parameter-dependent LMIs

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IEEE Conference on Decision and Control

作者： I. Masubuchi A. Kume E. Shimemura Dpt. of Computer and Systems Engmeering Kobe University Kobe Japan School of Information Science Japan Advanced Institute of Science and Technology Ishikawa Japan

Parameter-dependent quadratic forms (PDQF) play an important role in analysis and synthesis of linear parameter varying (LPV) systems. This paper proposes a method to find a PDQF that meets some criterion written in terms of LMI guaranteeing performances of LPV systems. Through approximation of PDQF with spline functions, we derive finite number of LMI from a given LMI-criterion on a PDQF, which is inherently a condition with infinitely many inequalities. This approximating solution to LMI on a PDQF is proved to have the following properties: (1) any solution to the derived LMI of finite number always produces a PDQF satisfying the original LMI-criterion, and (2) the finite LMI-condition always holds with sufficiently fine division of the parameter's region if the original one is solvable. Thus the results of this paper enable to solve parameter-dependent LMI associated with PDQF without conservatism.

关键词： Spline Stability criteria Information science Lyapunov method Control design Concrete Finite element methods Performance gain Linear matrix inequalities

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