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IEEE Symposium on Nuclear Science (NSS/MIC)

作者： R. Fontaine F. Belanger J. Cadorette J.D. Leroux J.-P. Martin J.-B. Michaud J.-F. Pratte S. Robert N. Viscogliosi R. Lecomte Department of Electrical Engineering and Computer Engineering Université de Sherbrook Sherbrooke Canada Metabolic and Functional Imaging Centre Centre Hospitalier Universitaire de Sherbrooke Sherbrooke Canada Department of Physics Université de Montreal Montreal Canada Instrumentation Division Brockhaven National Laboratory Upton NY USA Department of Nuclear Medicine and Radiobiology Faculty of Medicine Université de Sherbrook Sherbrooke Canada

The integration of a positron emission tomography (PET) scanner and a computed tomography (CT) scanner using the same detection system is a real challenge. The goal of the proposed PET/CT scanner design is to achieve high-speed data acquisition with a coincidence time window smaller than 10 ns and less than 1 mm spatial resolution in both PET and CT imaging using the same PET detectors and electronics. Events can be processed at high count-rate, based on a distributed computational architecture mounted directly within the PET ring. To satisfy these new technological requirements, a modular data acquisition sub-system (DASS) was designed, capable of handling up to 64 individual PET/CT detector channels. The DASS is based on off-the-shelf 8-bit, 100-MHz, high-speed free running analog-to-digital converters (ADC) and digital signal processing running on field programmable gate arrays (FPGA). The core of the processing units consists of four Xilinx Spartan-III FPGAs that can hold up to 16 individual channels each. The modular printed circuit board (PCB) has twelve copper layers, allowing separate ground and power planes to be implemented. The PCB outline allows various configurations in a multi-ring stacking geometry to realize 3-D scanners.

关键词： Data acquisition Distributed computing Positron emission tomography Computed tomography computer architecture Animals Field programmable gate arrays Detectors Spatial resolution High-resolution imaging

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CU vocal: Corpus-based syllable concatenation for Chinese speech synthesis across domains and dialects 7

CU vocal: Corpus-based syllable concatenation for Chinese sp...

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7th International Conference on Spoken Language Processing, ICSLP 2002

作者： Meng, Helen M. Keung, Chi Kin Siu, Kai Chung Fung, Tien Ying Ching, P.C. Human-Computer Communications Laboratory Department of Systems Engineering and Engineering Management Chinese University of Hong Kong Shatin Hong Kong Digital Signal Processing Laboratory Department of Electronic Engineering Chinese University of Hong Kong Shatin Hong Kong

This paper describes CU VOCAL, a Chinese text-to-speech synthesis system that adopts the approach of corpus-based syllable concatenation. We have demonstrated the applicability of the approach primarily for Cantonese, a major dialect of Chinese predominant in Hong Kong, South China and many overseas Chinese communities. This work extends our previous work as described in [1]. Our approach is able to synthesize speech from free-form text, and it can also be optimized for response generation in specific application domains. We have also demonstrated the portability of the approach to Putonghua, the official Chinese dialect, in a domain-optimized setting. Coarticulatory context is expressed in terms of distinctive features. Tonal context is also included. We conducted a series of listening tests using CU VOCAL, which gave favorable performance.

关键词： Speech communication

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Input reconstruction by means of system inversion: Application to fault detection and isolation 15th

Input reconstruction by means of system inversion: Applicati...

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15th World Congress of the International Federation of Automatic Control, 2002

作者： Szigeti, F. Bokor, J. Edelmayer, A. Systems and Control Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences Kende u. 13-17 BudapestH-1111 Hungary Department of Control Engineering Faculty of Engineering University of Los Andes Mérida A.P. 11 La Hechicera Venezuela

ISBN: (纸本)9783902661746

This paper attempts to look at the fundamental problem of fault detection and isolation (FDI) in nonlinear systems. Using the idea of input reconstruction by means of dynamic inversion the authors first discuss the properties of input (or fault) observability in linear systems. The extension of the results to nonlinear systems as well as the mathematical conditions of the calculation of the inverse system, which provides the inverse in finite algorithmic steps, are given. The applicability of the inversion process to fault reconstruction in nonlinear systems is demonstrated. Copyright © 2002 IFAC.

关键词： Fault detection

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Performance comparison of zerotrees based digital watermarking

Performance comparison of zerotrees based digital watermarki...

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IEEE International Conference on Industrial Technology (ICIT)

作者： S. Schwindt T. Amornraksa Multimedia Communications Laboratory Department of Computer Engineering Faculty of Engineering King Mongkut's University of Technology Bangkok Thailand

In this paper, speech based digital watermarking using zerotrees of the rearranged discrete cosine transform (DCT), discrete wavelet transform (DWT) and wavelet packet transform (WPT) for digital images are studied and compared, in term of the quality of the resultant images and robustness against attacks. The PSNR is used to evaluate the quality obtained from the watermarked images, while the robustness is measured from the strength of attacks the embedded speech signal can survive. In this research work the contents contained in the speech is used to identify the specific information hidden in the embedded signal. The speech signal after being extracted from the watermarked images is played back to the listeners to determine whether its content is intelligible or not. The experimental results show that the watermarking scheme implementing the zerotrees of the WPT give the best performance, compared to the others.

关键词： Watermarking Discrete wavelet transforms Discrete cosine transforms Wavelet packets Robustness digital images PSNR Speech analysis Signal processing Data mining

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Reflex HMD to compensate lag and correction of derivative deformation

Reflex HMD to compensate lag and correction of derivative de...

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IEEE Annual International Symposium Virtual Reality

作者： R. Kijima T. Ojika Virtual System Laboratory / Department of Applied Information Science Faculty of Engineering Gifu University Gifu Japan

ISBN: (纸本)0769514928

A head-mounted display (HMD) system suffers largely from the time lag between human motion and the display output. The concept of a reflex HMD to compensate for the time lag is proposed and discussed. Based on this notion, a prototype reflex HMD is constructed. The rotational movement of the user's head is measured by a gyroscope, modulating the driving signal for the LCD panel, and this shifts the viewport within the image supplied from the computer. The derivative distortion was investigated, and the dynamic deformation of the watched world was picked up as the essential demerit. Cylinderical rendering is introduced to solve this problem and is proved to cancel this dynamic deformation, and also to decrease the static distortion.

关键词： Delay effects Virtual reality Hardware Magnetic heads Magnetic separation Displays Rendering (computer graphics) Adaptive filters Data mining Gyroscopes

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Distributed display approach using PHMD with infrared camera

Distributed display approach using PHMD with infrared camera

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IEEE Annual International Symposium Virtual Reality

作者： R. Kijima K. Haza Y. Tada T. Ojika Virtual System Laboratory / Department of Applied Information Science Faculty of Engineering Gifu University Gifu Japan

ISBN: (纸本)0769514928

The aim of this study is to explore the feasibility of multiple display environment technology in the real world. In this paper, the wearable projector, with an infrared camera and light source, is used in combination with retro-reflective screens. The visible image and infrared light are projected to the screen and reflected back to the user's eye and the infrared camera. The screen location and the user's fingertip position are calculated using image processing to enable the interaction. Several examples or demonstrations have been constructed to show the usage of this configuration. The screen functions as both the visible screen and the high-gain infrared marker at the same time. Owing to high-reflection gain of retro-reflective screens, a small, lightweight projector can be used. Also, the high contrast between the screen and the other environmental object in the captured infrared image decreases the difficulty of image processing.

关键词： Cameras computer displays Image processing Head Virtual reality Mirrors Infrared imaging Personal digital assistants Optical sensors Information science

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VLSI architecture of digital matched filter and prime interleaver for W-CDMA

VLSI architecture of digital matched filter and prime interl...

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IEEE International Symposium on Circuits and systems (ISCAS)

作者： Y. Uchida M. Ise T. Onoye I. Shirakawa I. Arungsrisangchai Department Information System Engineering Osaka University Suita Osaka Japan Department Comm & Computer Engineering Kyoto University Kyoto Japan Faculty of Engineering King Mongkut''s Institute of Technology Ladkrabang Bangkok Thailand

A VLSI architecture dedicated to W-CDMA (Wideband Code Division Multiple Access) baseband modem is described, with the main theme focused on the cell searcher and PIL (Prime InterLeaver). A search algorithm is refined for the cell searcher to minimize the circuit size, maintaining the operating throughput. In addition, a time-shared scheme is adopted for the turbo encoding/decoding, aiming at the maximization of the hardware sharing in the encoding/decoding process. Finally, implementation results are shown to demonstrate that the proposed architecture can contribute much toward the practical low-power implementation of W-CDMA baseband modem LSI.

关键词： Very large scale integration Matched filters Multiaccess communication Baseband Modems Encoding Decoding Wideband Circuits Throughput

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Facial and eye gaze detection 2

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2nd International Workshop on Biologically Motivated computer Vision, BMCV 2002

作者： Park, Kang Ryoung Lee, Jeong Jun Kim, Jaihie Digital Vision Group Innovation Center LG Electronics Institute of Technology 16 Woomyeon-Dong Seocho-Gu Seoul137-724 Korea Republic of Computer Vision Laboratory Department of Electrical and Electronic Engineering Yonsei University Seoul120-749 Korea Republic of

ISBN: (纸本)9783540001744

Gaze detection is to locate the position on a monitor screen where a user is looking. In our work, we implement it with a computer vision system setting a IR-LED based single camera. To detect the gaze position, we locate facial features, which is effectively performed with IR-LED based camera and SVM(Support Vector Machine). When a user gazes at a position of monitor, we can compute the 3D positions of those features based on 3D rotation and translation estimation and affine transform. Finally, the gaze position by the facial movements is computed from the normal vector of the plane determined by those computed 3D positions of features. In addition, we use a trained neural network to detect the gaze position by eye’s movement. As experimental results, we can obtain the facial and eye gaze position on a monitor and the gaze position accuracy between the computed positions and the real ones is about 4.8 cm of RMS error. © Springer-Verlag Berlin Heidelberg 2002.

关键词： Cameras

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Intelligent diagnosis method for plant machinery using wavelet transform, genetic programming and possibility theory

Intelligent diagnosis method for plant machinery using wavel...

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IEEE Region 10 International Conference TENCON

作者： Peng Chen T. Horie T. Toyota Zhengjia He Faculty of Computer Science and System Engineering Kyushu Institute of Technology Iizuka Fukuoka Japan Japan Condition Diagnosis Technology Laboratory Incorporated Kitakyushu Japan Department of Mechanical Engineering Xi‘an Jiaotong University Xi‘an China

This paper proposes an intelligent diagnosis method for plant machinery using wavelet transform (WT) genetic programming (GP) and possibility theory. The WT is used to extract feature spectra of each machine state from measured vibration signal for distinguishing faults. Excellent symptom parameters (SP) for detecting fault states are automatically generated by GP. The membership functions of symptom parameters are established using possibility theory for resolving the ambiguous diagnosis problems. The methods proposed in this paper are verified by applying them to the fault diagnosis of gear equipment.

关键词： Machine intelligence Machinery Wavelet transforms Genetic programming Possibility theory Vibration measurement Fault diagnosis Feature extraction Fault detection Signal resolution

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digital envelope detector for blood pressure measurement using an oscillometric method

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Journal of Medical engineering and Technology 2002年第3期26卷 117-122页

作者： Lee, J.Y. Kim, J.K. Yoon, G. Samsung Advanced Institute of Technology Yong-In Korea Republic of Digital Signal Processing Laboratory Department of Electrical and Computer Engineering Sungkyunkwan University Suwon Korea Republic of

Blood pressure measurement in the finger artery offers some advantages compared with that in the brachial artery. However, volume oscillometric signals obtained from finger artery measurement are often influenced by motion artefact due to respiration, speaking, involuntary or voluntary movement, etc. In this paper, we developed a digital envelope detector to detect the maximum oscillation criterion in blood pressure measurement for the first time. The digital envelope detector is robust to noise signals generated by motion artefact and filters out the carrier frequency efficiently. To verify the feasibility of our method, we measured blood pressure for eight subjects using our developed system. The results were compared with the auscultation method. In the case of using a digital envelope detector, we could reduce the mean difference error and standard deviation by 30-40%. Our proposed digital envelope detector is a useful tool to improve the accuracy of blood pressure measurement in finger artery.

关键词： Biomedical engineering

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