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Classification of Malay speech sounds based on place of articulation and voicing using neural networks

Classification of Malay speech sounds based on place of arti...

引用

IEEE Region 10 International Conference TENCON

作者： Ting Hua Nong J. Yunus S.H.S. Salleh Department of Electronics Faculty of Electrical Engineering University Technology of Malaysia Malaysia Department of Microelectronics and Computer Engineering Faculty of Electrical Engineering University Technology of Malaysia Malaysia

This paper investigates the effectiveness of using neural networks in classifying Malay speech sounds according to their place of articulation and voicing. The system is very different from conventional speech recognition systems, where the systems do not classify the speech sounds into groups of voicing and place of articulation. The system proposed classifies 16 selected Malay syllables into their groups of phonetic features. The Malay syllables are initialized with stops and followed by succeeding vowels. The speech tokens are sampled at 16 kHz with 16-bit resolution. LPC-derived cepstrum is used to extract the speech features. A three-layer multilayer perceptron (MLP) is used to train and recognize the Malay syllables. The system gives an encouraging result, with an average accuracy of 92.92%.

关键词： Neural networks Speech recognition Multilayer perceptrons Turing machines Cepstrum Feature extraction microelectronics Vocabulary Lips

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Planar silicon light emitting sources in standard 1.2 and 2 micron CMOS technology

Planar silicon light emitting sources in standard 1.2 and 2 ...

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Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim)

作者： L.W. Snyman H. Aharoni M. du Plessis J.K. Marais Carl and Emily Fuchs Institute for Microelectronics (CEFIM) Department of Electrical Electronics and Computer Engineering University of Pretoria Pretoria South Africa Department Electrical and Computer Engineering Ben-Gurion University of the Negev Beersheba Israel Department of Electrical and Computer Engineering Ben-Gurion University of the Negev Beersheba Israel Carl and Emily Fuchs Institute for Microelectronics (CEFIM) Department of Electrical Electronics and ComputerEngineering University of Pretoria Pretoria South Africa

Three structures of silicon light emitting sources are described, each presenting higher electrical-to-optical conversion efficiency. The advantage of these structures lay in the fact that they were all fabricated usi... 详细信息

关键词： CMOS technology Silicon Testing Optical devices Light sources Integrated circuit yield Optical signal processing Africa Very large scale integration Integrated circuit technology

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Temperature-dependent large signal modulation and Auger recombination in In/sub 0.4/Ga/sub 0.6/As quantum-dot lasers

Temperature-dependent large signal modulation and Auger reco...

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Device Research Conference

作者： S. Ghosh P. Bhattacharya E. Stoner H. Jiang S. Nuttinck J. Singh J. Laskar Solid State Electronics Laboratory Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI USA Broadcom Corporation Irvine CA USA Microelectronics Research Center Department of Electrical Engineering Georgia Institute of Technology Atlanta GA USA

ISBN: (纸本)0780370147

Reports, to the best of the authors' knowledge, the first experimental determination of the Auger coefficients in quantum dots. In/sub 0.4/Ga/sub 0.6/As/GaAs self-organized quantum dot separate confinement heterostructure (SCH) lasers were grown by MBE. The active region consists of five coupled quantum dot layers. Single-mode ridge waveguide lasers with ridge widths 3/spl mu/m, 5/spl mu/m, and 8/spl mu/m and length 600/spl mu/m were fabricated by standard photolithographic techniques and cleaving of the facets. The peak lasing wavelength was measured to be 1.06/spl mu/m at room temperature, confirming lasing from ground state transitions. The lowest measured threshold current was 15 mA.

关键词： Quantum dot lasers Waveguide lasers Wavelength measurement Gallium arsenide Potential well Laser transitions Land surface temperature Stationary state Current measurement Threshold current

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A software architecture for image acquisition and camera control in an active computer vision system

A software architecture for image acquisition and camera con...

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22nd International Conference on Information Technology Interfaces, ITI 2000

作者： Šegvić, Siniša Stanisavljević, Vladimir Kalafatić, Zoran Department of Electronics Microelectronics Computer and Intelligent Systems Faculty of Electrical Engineering and Computing Unska 3 10000 Zagreb Croatia

ISBN: (纸本)9539676916

In a system for active computer vision, there is an intrinsic need for interfacing two different kinds of specific hardware devices: image digitizer and controllable camera. The architecture of software components responsible for these interfaces must be carefully designed in order to achieve their scalability, testability, maintainability, reusability and portability. Hardware abstraction is a major concern in this context since it allows to compile and test other system components independently of actual devices and their manufacturers. The paper reports on a feasible solution to the problem having many of the desired properties, using the object oriented design methodology. The designed architecture have been successfully implemented, in combination with several actual mechanisms for image acquisition and camera control. © 2000 Univ of Zagreb.

关键词： Distributed computer systems

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Very low threshold oxide-confined 1.3 /spl mu/m GaAs-based quantum dot laser

Very low threshold oxide-confined 1.3 /spl mu/m GaAs-based q...

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Conference on Lasers and Electro-Optics (CLEO)

作者： G. Park O.B. Shchekin D.L. Huffaker D.G. Deppe Microelectronics Centre Department of Electronics and Computer Engineering University of Texas Austin TX USA

ISBN: (纸本)1557526346

Summary form only given. Research on GaAs-based quantum dot (QD) lasers operating at 1.3 /spl mu/m wavelength has been rapidly advancing since the demonstrations of room-temperature operation in pulsed-mode and continuous wave (CW) operation. Native oxide confinement is of interest for this type of laser, similar to that used for quantum well edge-emitting lasers and quantum dot vertical cavity surface emitting lasers. The native oxide confinement is especially interesting due to the lateral "built-in" electronic confinement potentials that confine the current in lateral direction. We report on the room-temperature CW operation of oxide-confined single-layer InGaAs QD lasers with very low threshold current of 1.2 mA. The low threshold operation is achieved due to low optical waveguide loss of the native oxide.

关键词： Quantum dots Quantum dot lasers Vertical cavity surface emitting lasers Quantum well lasers Surface emitting lasers Optical waveguides Optical pulses Optical surface waves Indium gallium arsenide Waveguide lasers

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Real-time object tracking based on optical flow and active rays

Real-time object tracking based on optical flow and active r...

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Mediterranean Electrotechnical Conference (MELECON)

作者： Z. Kalafatic S. Ribaric V. Stanisavljevic Department of Electronics MicroelectronicsFaculty of Electrical Engineering and Computing Computer and Intelligent Systems Zagreb Croatia

A real-time system for tracking multiple quasi-rigid objects is presented. To enable the tracking of objects having similar gray-level intensity during contacts, we use dynamic information extracted by computing sparse optical flow along the object contours. Optical flow vectors are used for updating the positions of the tracked contours in a sequence of image frames. The local properties of optical flow enable the system to track the objects during and after contact, when parts of object contours become hidden. The missing dynamic information is reconstructed by using a model of constant optical flow along an object contour. To deal with the contours of changing-shape, a contour-correcting procedure based on an active contour model is added. The robustness of the tracking algorithm is improved by adding a supervision module, which detects tracking failures and reinitializes the lost contours. The system has been tested on real sequences with laboratory animals during pharmacological experiments and has been shown to be sufficiently robust and efficient.

关键词： Image motion analysis Optical computing Robustness Real time systems Data mining Image reconstruction Active contours System testing Laboratories Animals

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Integrating Dempster-Shafer belief functions into a knowledge representation system based on Petri nets

Integrating Dempster-Shafer belief functions into a knowledg...

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Mediterranean Electrotechnical Conference (MELECON)

作者： A.B. Posavec Department for Electronics Microelectronics Computer and Intelligent Systems at the Faculty of Electrical Engineering and Computing University of Zagreb Croatia

The expressive power and the epistemic adequacy of the Dempster-Shafer (DS) theory of evidence has often been acknowledged. DS theory of evidence is based on two components: a tool for representing belief for a statement, i.e. a pair of set functions (Bel, Pl) that quantify to what extent available evidence implies the statement and to what extent is available evidence consistent with the statement, respectively; and a tool for combining evidence. Thus DS theory deals with belief intervals rather than single numerical values of belief. There is an explicit differentiation between the notion of disbelief from that of lack of belief. However, as many other methodologies in the field of uncertain reasoning, DS theory addresses only the problem of representing the uncertainty of knowledge, without dealing with the problem of representing the knowledge itself. Saffiotti (1994) has proposed a framework for integrating the DS theory with a knowledge representation system. This approach introduces so-called belief bases, whose purpose is to allow embedding belief functions into a knowledge representation system which is better suited for representing the knowledge itself. Belief bases for a given knowledge representation system are built using three primitive operations, which utilize Dempster's combination rule. This paper describes an attempt at integrating appropriately modified belief bases into a knowledge representation system which utilizes Petri nets for representing knowledge.

关键词： Knowledge representation Uncertainty Petri nets Intelligent systems Fuzzy reasoning Fuzzy logic computer network management microelectronics Computational complexity Modeling

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A study of doped patch and dipole antenna arrays with photonic interactions

A study of doped patch and dipole antenna arrays with photon...

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International Topical Meeting on Microwave Photonics, MWP 2000

作者： Lockyer, D.S. Vardaxoglou, J.C. Ensell, G.J. Department of Electronic and Electrical Engineering Loughborough University Loughborough LeicestershireLE11 3TU United Kingdom Microelectronics Centre Department of Electronics and Computer Science University of Southampton Highfield SouthamptonSO17 1BJ United Kingdom

A technique to control the transmission properties of arrays doped in silicon is described. Photonic excitation creates plasma, which alters array performance. This can be controlled using optical masks and the resona... 详细信息

ISBN: (纸本)0780364554

关键词： Natural frequencies

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Power characteristics of high voltage LDMOS transistors

Power characteristics of high voltage LDMOS transistors

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2000 30th European Microwave Conference, EuMC 2000

作者： Gebara, Edward Rorsman, Niklas Olsson, Jörgen Zirath, Herbert Eklund, Klas-Håkan Laskar, Joy Georgia Institute of Technology School of Electrical and Computer Engineering Atlanta United States Chalmers University of Technology Department of Microelectronics Götteborg Sweden Uppsala University Ångström Laboratory Solid-State Electronics Uppsala Sweden Eklund Innovation Sweden

A lateral double diffused DMOS (LDMOS) transistor has been integrated into a CMOS process. An effective RESURF of the drain drift region enables a high breakdown voltage of about 90V and GHz operation. The measured output power density is 1.4W/mm at 1GHz for a supply voltage of 70V. A power added efficiency (PAE) of 51% and an output power density of 1.2W/mm was obtained at 50V. © 2000 IEEE.

关键词： MOS devices

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A study of doped patch and dipole antenna arrays with photonic interactions

A study of doped patch and dipole antenna arrays with photon...

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International Topical Meeting on Microwave Photonics (MWP)

作者： D.S. Lockyer J.C. Vardaxoglou G.J. Ensell Department of Electronic and Electrical Engineering Loughborough University Loughborough UK Microelectronics Centre Department of Electronics and Computer Science University of Southampton Southampton UK

关键词： Dipole antennas Antenna arrays Silicon Conductivity Frequency selective surfaces Doping Optical control Resonance Temperature Solids

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