• 전력전자학회:학술대회논문집
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• 전력전자학회 2004년도 전력전자학술대회 논문집(2)
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• pp.641-645
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• 2004

This paper presents a new speed control method using the acceleration feedforward compensation and using the disturbance torque estimate method. The proposed method improve transition response characteristic of system and has been a robust characteristic in the four-switch three-phase motor drive system in which the gain of speed controller cannot be made large enough. The simulation results prove the validity of the proposed method.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제51권7호
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• pp.379-386
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• 2002

This paper deals with dynamic analysis method of a slotless type permanent magnet linear synchronous motor(PMLSM) using 3-dimensional space harmonic method. The results are good agreement with FEA results because that slotless type PMLSM has simple structure and no saturation of core. And then, Under open-loop control, starting characteristic is analyzed by voltage equation combining with dynamic equation. In order to obtain more accuracy results, this paper use instantaneous back-EMF and thrust instead of back-EMF constant and thrust constant.

• 한국해양공학회지
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• 제17권3호
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• pp.21-26
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• 2003

An iteractive Kantorovich method is presented for the vibration analysis of rectangular orthotropic thick plates. Mindlin plate characteristic functions are derived in general forms using the Kantorovich method. Initially, Timoshenko beam functions consistent with the boundary conditions of the plate were used. Through numerical calculations of natural fairs of appropriate models, it has been confirmed that the method presented is superior to the Rayleigh-Ritz analysis or the finite element analysis in both accuracy and computational efficiency.

• 정보처리학회논문지A
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• 제15A권6호
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• pp.351-360
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• 2008

개별화 학습은 단지 하나의 교수 학습 방법으로서의 의미가 아니라는 인식이 보편화되어 교실 수업뿐만 아니라, 성인 교육, 기업 교육 등 다양한 교수 학습 상황에서 관심을 끌어왔다. 한편 효과적인 개별화 학습은 학습자 특성에 대한 정확한 분석 및 측정이 필수적으로 요구되나, 학습자 특성에 대한 개념과 범주가 다양하고 광범위하여 그에 대한 계량적인 기술이 어렵다. 이에 본 연구에서는 학습자 특성을 인지구조와 인지양식으로 제한하였다. 또한 학습자 특성을 연결주의적 관점에서 기술하고 이를 기반으로 하여 학습자 특성의 정량화 기법을 제안하며 그에 대한 타당성을 검증하였다. 본 연구에서의 학습자 인지구조는 기존에 연구된 학습자 인지구조 객체를 간소화하였고 인지양식은 학습자 인지의 지식관성력으로 축소하여 기술하였다.

• 전자공학회논문지A
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• 제32A권7호
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• pp.23-29
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• 1995

A characteristic mode theory for longitudinal slot of arbitrary width in the outer conductor of coaxial waveguide is applied for calculating the characteristic magnetic currents, the characteristic fields, radiation patterns, and the fields evershere(inside and outside the guide, and in the aperture region). Numerical results of the equivalent magnetic currents and the radiation patterns are compared with those obtained by use of the method of moments.

• 전기학회논문지
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• 제57권4호
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• pp.596-602
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• 2008

This paper presents the dynamic characteristic analysis of Permanent Magnet Linear Synchronous Motor(PMLSM) according to variable load. In order to analyze dynamic characteristics, finite element method(FEM) was used for calculation of the parameter and the Matlab simulink was used for dynamic characteristic simulation. The measuring system of the dynamic characteristics was manufactured and the experiment results were compared with the simulation results.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 하계학술대회 논문집 B
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• pp.811-813
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• 2002

This paper deals with the design of vaccum pump using moving magnet type linear oscillaory actuator based on the design procedure and the characteristic analysis. To improve the starting characteristic, the optimum spring constant is detected and redesigned. The parameter was calculated by Finite Element Method(FEM). In order to dynamic characteristic analysis, Time difference method with voltage and kinetic equation is used. The propritey of the improved model is verified through the experimental.

• 한국전자통신학회논문지
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• 제10권9호
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• pp.1033-1038
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• 2015

상보 필터(Complementary Filter)는 실시간 자세계측을 위해 신호처리 방법으로 많이 사용된다. 필터 설계에서 2차 이상의 버터워즈 특성을 갖도록 하여, 통과대역에서 이득은 균일하고 차단대역에서는 차단 특성이 좋은 버터워즈 특성(Butterworth Filter)을 갖는 상보필터의 설계방법을 제안한다. 적정한 필터 계수의 설정으로 필터의 성능 개선이 이루어짐을 시뮬레이션을 통하여 입증하여 보인다. 시뮬레이션을 바탕으로 산정된 필터의 계수를 이용하여 실시간 신호처리가 가능함을 실험으로 보인다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2011년도 제42회 하계학술대회
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• pp.1067-1068
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• 2011

This paper deals with the method of starting characteristic analysis of a single-phase line-start permanent magnet (LSPM)motor. The starting characteristic such as current, torque and is important in LSPM because of demagnetizing of the permanent magnet. In this paper, the characteristic analysis is performed using finite element method.

• 전기학회논문지
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• 제56권4호
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• pp.699-704
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• 2007

In this paper, optimized model was designed for the starting characteristic of the Single-Phase Line-Start Permanent Magnet Synchronous Motor by using the Design of Experiment. A field pole angle, thickness and distance from center axis of permanent magnet were selected as design factor. We executed the transient state characteristic analysis of 8 test models. The transient state characteristic analysis was executed by using the 2 dimensional Finite Element Method and the Time Difference Method. We checked the fact that the selected design factor affected starting characteristic of the Line-Start Permanent Magnet Synchronous Motor. Depend on this result we found the optimized design point by using the response optimization.