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SICE Annual Conference

作者： K. Tripipatpornchai Y. Rungruengphalanggul A. Chaisawadi Department of Electrical and Electronic Engineering Faculty of Engineering Rangsit University Pathum Thani Thailand Department of Control System and Instrumentation Engineering Faculty of Engineering King Mongkut''s University of Technology Thonburi Bangkok Thailand

ISBN: (纸本)0780383524

This paper proposes a direct current buck converter which provides two independent regulated direct current output voltages using only single control switch. The first converter operation is based upon the use of continuous conduction mode (CCM) to regulate output voltage by controlling the duty cycle of the switch, while the second converter operation is based upon the use of discontinuous conduction mode (DCM) to regulate output voltage by controlling the duty cycle and changing the switching frequency. The system's operation is verified by results from computer simulation and experimentation from the prototype in this experiment, the switching frequency range is from 4 kHz to 90 kHz and the duty cycle range is from 20% to 42%. The overall efficiency of this converter is approximately 83% at full load.

关键词： Switches DC-DC power converters Switching converters Buck converters Inductors Voltage control Equations Switching frequency Circuits control systems

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Fitting a Pineapple Model for Automatic Maturity Grading

Fitting a Pineapple Model for Automatic Maturity Grading

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IEEE International Conference on Image Processing

作者： Watcharin Kaewapichai Pakorn Kaewtrakulpong Asa Prateepasen Kittiya Khongkraphan Instrumentation and Control System Engineering Department Faculty of Engineering King Mongkut''s University of Technology Bangkok Thailand Production Engineering Department Faculty of Engineering King Mongkut''s University of Technology Bangkok Thailand

In this paper, we present a pineapple skin model and a method to fit the model. Our main application of the model is for automatic maturity grading of pineapples in canned pineapple industry. The model consists of two subparts: Phyllotaxis and pineapple scale models. The Phyllotaxis model represents the spiral arrangement of pineapple-scales, which is a growing pattern of the fruit. It includes a string of scale-model cells. The scale model includes boundary, internal area and petal part of scale. Modified snake algorithm is used to construct the structure model while Active Shape Model (ASM) is applied to each scale. The model can accurately fit to pineapple skins in our experiment and classification features of the fruit can be extracted.

关键词： Spirals Skin Active shape model Fitting Instruments control system synthesis Automatic control systems engineering and theory Production engineering Raw materials

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Road traffic estimation based on position and velocity of a cellular phone

Road traffic estimation based on position and velocity of a ...

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International Conference on ITS Telecommunications (ITST)

作者： S. Promnoi P. Tangamchit W. Pattara-Atikom Department of Control System and Instrumentation Engineering King Mongkut''s University of Technology Thonburi Thailand National Electronics and Computer Technology Center Pathum Thani Thailand

This research studies the proof of concept to road traffic estimation based on the position and velocity of cellular phones. The positioning technique, received signal strength method, was applied to obtain road traffic data. The two algorithms: Linear interpolation of position from signal strength and centroid of signal strength were implemented to identify the positions and velocity of a mobile phone in cars. Successfully estimated results, position and speed, showed that both of two methods have the potential to estimate traffic congestion while the first method is more efficient than another. According to the first method, it yielded an average error of 190.8 m, while the velocity estimation yielded an average error of 10.38 km/hr. The errors from another are 195.29 m and 10.39 km/hr respectively.

关键词： Cellular phones Mobile handsets Roads Base stations Neurons Interpolation Signal processing Broadcasting Velocity control control systems

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Automatic Thai audio/transcription segmentation

Automatic Thai audio/transcription segmentation

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International Conference on Electrical engineering/Electronics, Computer, Telecommunications and Information Technology, ECTI-CON

作者： Chatree Santiklang Chai Wutiwiwatchai Panuthat Boonpramuk Control System and Instrumentation Engineering King Mongkut's University of Technology Thonburi Bangkok Thailand National Electronics and Computer Technology Center Pathum Thani Thailand

This paper proposes an automatic algorithm for segmenting audio and transcription streams to be used in constructing a large vocabulary continuous speech recognition (LVCSR) system. In many cases, LVCSR training data are derived from audio materials with available transcriptions such as preach and news articles. In Thai, these resources are usually in the form of long wave files with their corresponding text articles written with no explicit word nor sentence separation, which is crucial for acoustic and language model training in LVCSR. The proposed algorithm segments a large wave file into small utterances using energy detection. The transcription is then aligned to each utterance using dynamic time warping (DTW) combined with a classification and regression tree (CART) confidence measure over a phone basis. An evaluation shows that the DTW alignment procedure still requires an improvement while the CART confidence measure achieves a promising result.

关键词： Streaming media Vocabulary Speech recognition Training data Acoustic waves Acoustic signal detection Classification tree analysis Regression tree analysis Acoustic measurements Time measurement

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Analysis and simulation of a multilevel inverter converter NPC Cascade

Analysis and simulation of a multilevel inverter converter N...

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International Conference on Computer engineering and systems

作者： F. Bouchafaa E.M. Berkouk M.S. Boucherit Laboratory of Instrumentation and engineering system University of Sciences and Technology Houari Boumediene Algiers Algeria Laboratory of Process Control National Polytechnic School of Algiers Algiers Algeria

ISBN: (纸本)1424413656;9781424413652

This paper describes the control and regulation of input DC voltages of nine-level NPC voltage source inverter. The analysis and simulation of a cascade constituted by three phase's five-level PWM rectifier-nine levels NPC voltage source inverter (VSI). In the first part, the authors present the five-level PWM rectifier. After, we present a topology of nine levels NPC VSI for then we propose a model of this inverter and the SVPWM strategy which uses eight bipolar carriers to control it. The study of this cascade shows that the input DC voltages of the inverter are not stable and not equals. To remedy to this problem, the authors propose to introduce in the cascade a clamping bridge and regulation using PI regulator. In the second part, we study speed control of the Permanent magnet synchronous machine (PMSM) by using the field oriented control. The results obtained are full of promise to use the inverter in high voltage and great power applications as electrical traction.

关键词： Analytical models Pulse width modulation inverters Space vector pulse width modulation Voltage control Rectifiers Topology Clamps Bridge circuits Regulators Velocity control

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A study of recognition rate improvement for Thai esophageal speech by using feature conversion

A study of recognition rate improvement for Thai esophageal ...

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International Conference on Electrical engineering/Electronics, Computer, Telecommunications and Information Technology, ECTI-CON

作者： P. Sabayjai P. Boonpranuk P. Kayasith C. Wutiwiwatchai Control System and Instrumentation Engineering King Mongkut's University of Technology Thonburi Bangkok Thailand National Electronics and Computer Technology Center Pathum Thani Thailand

The paper represents a front-end process for changing esophageal speech features into normal speech features in order to improve a recognition rate of esophageal speech in a speech recognition system that training by normal speech corpus based on Hidden Markov Models (HMMs). A system, that combines feature conversion technique and cepstral normalization technique in order to prevent variation bias in each signal, is proposed. From experimental results, the feature conversion technique can significantly improve the recognition rate of esophageal speech from 33.75% up to 67.48%. Moreover, the recognition rate is raised up to 77.68% when using the cepstral normalization technique with the feature conversion.

关键词： Speech recognition Esophagus Speech processing Hidden Markov models Larynx Speech analysis Cepstral analysis Pulse modulation Instruments systems engineering and theory

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Algebraic PWM Strategy of a Multilevel NPC Voltage Source Inverter

Algebraic PWM Strategy of a Multilevel NPC Voltage Source In...

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IEEE International Conference on Electronics, Circuits and systems (ICECS)

作者： D. Boufassa F. Bouchafaa E.M. Berkouk M.S. Boucherit Laboratory of Instrumentation and Engineering System University of Sciences and Technology Houari Boumediene Algiers Algeria Laboratory of Process Control National Polytechnic School of Algiers Algiers Algeria

In this paper, the author's present one algorithm of algebraic PWM strategy for nine - level Neutral Point Clamping (NPC) Voltage Source Inverter (VSI) is presented. This algorithm uses a control model of the inverter developed previously by the authors. In the first part, we develop a working model of this inverter, without presumption on its control, by using the connection functions of this converter. In the second part the control models of this converter by using respectively instantaneous and generating connection functions are reviewed. In the last part, one algebraic PWM control strategy of the inverter is proposed. The obtained results are full of promise to use this digital strategy to control nine-level NPC VSI used in high voltage, high power applications as electrical

关键词： Pulse width modulation inverters Clamps Voltage control Velocity control Zero voltage switching Pulse width modulation Instruments systems engineering and theory Process control Digital control

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Kinematic modeling of mobile robots by transfer method of augmented generalized coordinates

Kinematic modeling of mobile robots by transfer method of au...

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IEEE International Conference on Robotics and Automation (ICRA)

作者： Wheekuk Kim Do Hyung Kim Byung-Ju Yi Bum Jae You Department of Control and Instrumentation Engineering Korea University South Korea School of Electrical Engineering and Computer Science Hanyang University South Korea Intelligent System Control Research Center Korea Institute of Science and Technology South Korea

ISBN: (纸本)0780365763

A kinematic modeling method is proposed which uses augmenting variables to match the dimensions of the input vector and output vector of each serial subchain of the mobile robots. Firstly, kinematic models of various type of wheels are derived including skidding and sliding velocities. Then the method of augmented generalized coordinates is applied to obtain inverse and forward kinematic models. The kinematic models derived by the direct inverse of the augmented matrices provide an accurate solution, which was not achievable by the modeling method based on the pseudo-inverse method which provides an approximate solution. Lastly, two kinematic models for typical, differential-driven mobile robots are presented to show the effectiveness of the proposed modeling method.

关键词： Mobile robots Wheels Electric variables control Intelligent robots Robot kinematics Instruments Computer science Intelligent systems Intelligent control control system synthesis

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Enslavement and control in dq synchronous frame for using a cascade multilevel NPC structure

Enslavement and control in dq synchronous frame for using a ...

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International Design and Test Workshop

作者： F. Bouchafaa S. Arezki M. Boudour E.M. Berkouk Laboratory of Instrumentation and Engineering System University of Sciences and Technology Houari Boumediene Algiers Algeria Laboratory of Process Control Department Electrical engineering National Polytechnic School of Algiers Algiers Algeria

The aim of this paper is to give a solution to unbalance problem of the input DC voltages of the nine-level NPC-VSI in dq synchronous frame. For that, we used in high voltage and great power applications, one two-level PWM current rectifier-nine-level NPC VSI cascade. In the first part, we develop a knowledge model of the nine-level NPC VSI and propose a space vector modulation of this converter using eight bipolar carriers. After that, this study shows particularly the problem of the stability of the DC voltages of the inverter. Then, we propose a solution to the problem by employed closed loop regulation using classic PI regulator mode in d-q synchronous frame. We add a clamping bridge to stabilise the multi DC input voltages of the nine-level NPC VSI. This cascade found applications in great power and high voltage fields as electrical traction.

关键词： Voltage Pulse width modulation inverters Pulse width modulation Clamps Stability Bridge circuits Regulators Power semiconductor switches Instruments systems engineering and theory

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Temperature and strain sensitivities of surface and hybrid acoustic wave Brillouin scattering in optical microfibers

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Chinese Physics B 2022年第9期31卷 333-339页

作者： Yi Liu Yuanqi Gu Yu Ning Pengfei Chen Yao Yao Yajun You Wenjun He Xiujian Chou Taiyuan University of Technology Key Laboratory of Advanced Transducers and Intelligent Control SystemMinistry of Education and Shanxi ProvinceTaiyuan 030024China Taiyuan University of Technology Institute of Optoelectronic EngineeringCollege of Physics and OptoelectronicsTaiyuan 030024China Strong Digital Technology Co. Ltd.(Thinvent)Nanchang 410000China North University of China Key Laboratory of Instrumentation Science and Dynamic Measurement Ministry of EducationTaiyuan 030051China North University of China College of Mechatronics EngineeringTaiyuan 030051China North University of China Science and Technology on Electronic Test and Measurement LaboratorySchool of Instrument and ElectronicsTaiyuan 030051China

Temperature and strain sensitivities of surface acoustic wave(SAW)and hybrid acoustic wave(HAW)Brillouin scat-tering(BS)in 1μm-1.3μm diameter optical microfibers are *** contrast to stimulated Brillouin scattering(SBS)from bulk acoustic wave in standard optical fiber,SAW and HAW BS,due to SAWs and HAWs induced by the coupling of longitudinal and shear waves and propagating along the surface and core of microfiber respectively,facilitate innovative detection in optical microfibers *** highest temperature and strain sensitivities of the hybrid acoustic modes(HAMs)are 1.082 MHz/℃and 0.0289 MHz/με,respectively,which is suitable for microfiber sensing applica-tion of high temperature and strain ***,the temperature and strain sensitivities of the SAMs are less affected by fiber diameter changes,ranging from 0.05 MHz/℃/μm to 0.25 MHz/℃/μm and 1×10^(-4) MHz/με/μm to 5×10^(-4) MHz/με/μm,*** can be found that that SAW BS for temperature and strain sensing would put less stress on manufacturing constraints for optical ***,the simultaneous sensing of temperature and strain can be realized by SAW and HAW BS,with temperature and strain errors as low as 0.30℃-0.34℃and 14.47με-16.25με.

关键词： Brllouin scatering surface acoustic waves hybrid acoustic waves optical microfiber sensing

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