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元忠淵,梁承浩,金德憲,金世燦 成均館大學校 科學技術硏究所 1992 論文集 Vol.42 No.2
In this paper, the authors describe the equivalent circuit for a DC motor in consideration of both magnetic saturation and armature reaction phenomena. To develop DC motor model in PSPICE is to eliminate the gap between drive electronics and models of driven machine. On the basis of these results the dynamic characteristics of a MOSFET chopper controlled DC series motor are investigated by PSPICE simulation and experiment.
전력전자 PSPICE 컴퓨터 시뮬레이션을 위한 스위치 모델
元忠淵,金淵俊,金世燦,金德憲 成均館大學校 科學技術硏究所 1990 論文集 Vol.41 No.2
PSPICE is widely used in analysis of general circuit and simulation in electric and electrical field is applied to power electronics circuit. The circuits used with thyristors will add significant complexity to PSPICE analysis, it is important that the thyristor model be as simple as possible. In order to solve this problem, an ideal voltage controlled switch and an ideal current controlled switch were added as circuit elements. Two typical power electronics circuits simulation using PSPICE program presented.
전류제어형 PWM 인버어터―유도전동기 위치제어의 신경회로망 응용
元忠淵,梁承浩,金世燦,金德憲 成均館大學校 科學技術硏究所 1991 論文集 Vol.42 No.1
이 논문은 전력변환기 시스템 모델링에 대한 신경회로망 사용을 기술하였다. Bp 알고리즘은 PWM 인버어터에 의해 구동되는 유도전동기의 on-off 패턴제어를 모델화하기 위해 처음으로 사용되었다. 신경회로망의 한 잇점은 본질적으로 병렬처리 이어서 그 결과 직렬인 디지털 컴퓨터보다 훨씬 빠르다. 게다가 신경회로망은 인버어터에 대해 학습능력이 있다. 제안된 방법의 타당성을 디지털 컴퓨터 시뮬레이션을 통하여 확인하였다. This paper discribes the use of neural networks for modeling power converter system. A back propagation(BP) algorithm is used firstly to model on-off pattern control of PWM inverter fed induction motor and, as a result, can solve problems much faster than a serial digital computer. Furthermore, neural networks have ability to learn for inverter. The validity of proposed method is confirm through the digital computer simulation.
Soft Switching 방식을 이용한 Active Clamp Mode Forward Converter 설계
원충연,유동욱,김덕헌,김학성 成均館大學校 科學技術硏究所 1992 論文集 Vol.43 No.2
In recent years, a trend of DC-DC converter is studied mainly quasi resonant converter and multi resonant converter such as resonant type. But by using zero voltage and zero current method, these converter have voltage and current stress in the circuits. So the purpose of this paper is to reduce voltage and current stress, and to increase efficiency (about 5∼10%) rather than above converters. Experimental results show that active clamp mode PWM switching forward converter has minimum switching loss and conducting loss. The test results verify the simulation performance.
황덕기,김영일,박동원 동아대학교 공과대학 부설 한국자원개발연구소 1993 硏究報告 Vol.17 No.1
Liquid-Liquid separation of Cu(Ⅱ) by SLM with hallow fiber module is one of the most effective method for removal, separation of heavy metals in aqueous solution and waste water. Liquid-Liquid separation by SLM using tri-octyl amine(TOA) was studied in order to investigate the optimum separation condition of CU(Ⅱ) and overall coefficient of mass transfer. The experimental result was that separation of CU(Ⅱ) in aqueous solution accomplished very well and overall coefficient of mass transfer was accordance experimental values with theoretical values.
초음파 비선형 음향 효과 및 X-선 회절법을 이용한 2.25Cr-1Mo 강의 열화 손상 평가
김덕희,박은수,박익근,변재원,권숙인 한국산업안전학회 2002 한국안전학회지 Vol.17 No.4
It was attempted to evaluate the degree of degradation of thermally aged 2.25-1Mo steel by ultrasonic nonlinear parameter(UNP) measurement and X-ray diffraction analysis of extracted carbide. Artificial aging was performed to simulate the microstructural degradation in 2.25Cr-1Mo steel arising from long time exposure at 540℃. Microstructural analysis (number of carbides per unit area) and measurements of mechanical properties(Vickers hardness, DBTT) and degradation evaluation parameters(UNP and intensity ratio of X-ray diffraction peak of electrolytically extracted carbied) were performed. Both of UNP and intensity ratio of X-ray diffraction peak for M6C carbied to that of M23C6 carbied(IR) increased abruptly in the initial 100 hour of aging and then changed little. UNP and IR were proposed as potential parameters to evaluate the degree of aging degradation of 2.25Cr-1Mo steel.
실관막에 의한 Cd(Ⅱ) 및 Cu(Ⅱ)의 액-액 추출에 관한 연구
황덕기,박동원 동아대학교 환경문제연구소 1993 硏究報告 Vol.16 No.2
The extraction of Cd(Ⅱ) and Cu(Ⅱ) in mixed aqueous solution was studied with TOA(tri-n-octylamine) dissolved in aromatic organic solvents using HFSLM(hollow fiver supported liquid membrane). HFSLM module with constant volume was used to measure mass transfer coefficients of the extraction with mixed aqueous solution under acidic condition at 25℃, and overall mass transfer coefficients were increased with increasing initial concentration of HCI in mixed aqueous solution, with increasing velocity of inner fibers.
이덕희,문종국,배강우,이용환,김진하,박강원 大韓産業醫學會 1996 대한직업환경의학회지 Vol.8 No.3
This study was conducted to evaluate the blood lead levels in 141 pregnant women who were not occupationally exposed to lead and their umbilical cord, and to identify some differences in blood lead levels by living area. The subjects were all delivered at St. Benedict Hospital in Pusan and the blood lead levels were measured by graphite furance atomic absorption spectrophotometer. The summarized results were as follows. 1. The geometric mean lead levels in maternal and cord blood were 8.0±1.8μg/dl, 5.0±0.6μg/dl respectively. 2. Lead levels in maternal(8.7±1.7μg/dl) and cord blood(5.4μ±0.7μg/dl) of industrial area(n=24) were higher than residential area(n=124) which were 7.9±1.7μg/dl and 5.0±0.6μg/dl respectively(p<0.05). 3. Maternal blood lead concentration was significantly correlated to cord blood lead concentration(r=0.6090, p<0.001), but other variables(maternal age, paternal smoking, birth weight, etc) were not correlated.
실관막에 의한 화학슬러지 중 철(Fe) 회수에 관한 연구
박동원,황덕기,김영일 동아대학교 환경문제연구소 1992 硏究報告 Vol.15 No.2
The metal extractions in microporous hollow fiber modules cut down the cost of energy and gain the enlargement of separation efficiency because of their large surface area per unit volumn. This study examines Fe(Ⅲ) separation in wastewater and the optimum separation condition from values of overall mass transfer coefficient, with hollow fiber membrane module, using tri-n-octylamine as extractant. The experimental results are as follows. 1. The separation rate was maximum at pH 2 and as pH in Fe(Ⅲ) solution grew, overall mass transfer coefficient was decreased. 2. As the flow rate of feed solution in the hollow fiber module increased, overall mass transfer coefficient was increased. 3. In the transfer resistance in the hollow fibers, the mass transfer resistance which follows solute diffusion in the hollow fibers dominated overall mass transfer resistance.