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- 저자 : Jang Choon-Man (검색결과 186 건)
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한국어 대용량 음성인식에서의 효율적인 시간 감축에 관한 연구
장춘서,이기수,신윤식,임은기,김병만,김현수 금오공과대학교 산업기술개발연구원 2000 産業技術開發硏究 Vol.16 No.-
In this paper a time reduction algorithm for large vocabulary speech recognition system has been studied. TDNN(Time Delay Neural Network) was used to classify vowel using phonetical fetures. To increase performance of vowel classification, modular TDNN architecture associated with 2 states input layer has been suggested.
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韓萬春,申明澈,張成煥,李基西 연세대학교 산업기술연구소 1979 논문집 Vol.11 No.1
A linear state equation of the first order differential form relating the load-frequency dynamic characteristics of interconnected power systems was derived for use in computer simulations. A new solution of the algebraic matrix Riccati equation for applications in quadratic optimal controllors and least-square state estimators determination was developed. The program for a dynamic state equation for two interconnected control areas was developed. The optimized load-frequency deviation was analysed and a numerical analysis was tried based on the computer simulation. It was shown that the dynamic response of the load-frequency could be optimized with the weighting factors R and Q The result was that the load-frequency and the tie-line deviation were visibly reduced.
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염만오,장성철,이동극,배춘익 경남대학교 공업기술연구소 2000 硏究論文集 Vol.18 No.-
전기점성유체는 전기장내에서 유변물성이 빠르게 증가하는 현탁액이다. 전기장에 대한 물성의 응답속도가 매우 빠르고 전기장을 제거하면 원래의 유변물성을 가역적으로 가지는 특성이 있다. 그러므로 실용적인 측면에서 많은 응용분야가 있다. 전기점성유체는 자동변속기 오일에 전분입자를 첨가한 무게분율 35wt%의 분산계 ER유체를 사용하였다. 본 연구의 목적은 ER유체의 유량과 압력강하를 스트레인 게이지를 이용하여 계측하는데 있다. Electro-Rheoloical(ER) fluids are suspensions which show an abrupt increase in rheological properties under electric fields. The rheological response is very rapid and reversible when the electric field is imposed and/or removed. Therefore, there are many practical applications using the ER fluids. The ER fluid manufactured here is cousisted of starch particles dispersive ER fluid of weight fraction 35% in a automatic transmission oil. The purpose of the present study is flow rate and pressure drop measurement of an ER fluid by using strain gage.
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Performance Enhancement of 20kW Regenerative Blower Using Design Parameters
Jang, Choon-Man,Jeon, Hyun-Jun Korean Society for Fluid machinery 2014 International journal of fluid machinery and syste Vol.7 No.3
This paper describes performance enhancement of a regenerative blower used for a 20 kW fuel cell system. Two design variables, bending angle of an impeller and blade thickness of an impeller tip, which are used to define an impeller shape, are introduced to enhance the blower performance. Internal flow of the regenerative blower has been analyzed with three-dimensional Navier-Stokes equations to obtain the blower performance. General analysis code, CFX, is introduced in the present work. SST turbulence model is employed to estimate the eddy viscosity. Throughout the numerical analysis, it is found that the thickness of impeller tip is effective to increase the blower efficiency in the present blower. Pressure is successfully increased up to 2.8% compared to the reference blower at the design flow condition. And efficiency is also enhanced up to 2.98 % compared to the reference one. It is noted that low velocity region disturbs to make strong recirculation flow inside the blade passages, thus increases local pressure loss. Detailed flow field inside the regenerative blower is also analyzed and compared.
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