• Proceedings of the IEEK Conference
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• 2003.07e
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• pp.2427-2430
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• 2003

A uniformly sampled digital pulse-width modulation adopting a pre-compensation filter scheme for applications in high-resolution digital-to-analog data conversion is described. It is shown that linearization of the intrinsic distortion resulting in uniformly sampled pulse-width modulation can be achieved by using a non-integer delay digital filter embedded within a noise shaping re-quantizer.

• Proceedings of the KIPE Conference
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• 1998.07a
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• pp.217-220
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• 1998

In this paper, for high performance as drive, in the speed sensorless vector control of induction motor, introduced flux estimator of voltage model and error compensation algorithm using closed loop integration method, and then we proposed a improved flux estimation method of high accuracy. And the rotor speed is estimating using the stator current and the estimated flux, it is used speed information. The proposed scheme is verified through digital simulations and experiments for 3.7[kW] induction motor and shows good dynamic performance.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1996.11a
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• pp.1012-1016
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• 1996

This paper presents an automatic calibration technique for piezoelectic low pressure transducer, which is useful to measure a pressure within 500 psi. This system with automatic calibration function and error correction algorithm generates standard dynamic pressure for the calibration of sensor. With the compensation for the offset voltage and the pressure error, the accuracy and the usefulness of the proposed scheme is validated.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1995.04b
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• pp.342-347
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• 1995

Loop shaping $H_{\infty}$control with normalized coprime factorization was applied to a servo-motor driven high-speed powitioning system. The high-gain controller was designed to attenuate the postion errors caused byfriction effects and extermal disturbances. The non-existence of limit cycle was analyzed, though there is actuator saturation. The designed $H_{\infty}$control system was experimently tested in a rotary index table. Results showed its effectiveness to improve postion accuracy with out any compensation scheme for friction, and robustness to model perturbation and external disturbances.ces.

• Proceedings of the IEEK Conference
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• 2000.07a
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• pp.129-131
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• 2000

A new analog synchronous mirror delay to be used in the wide-bandwidth clocking circuits is proposed to overcome the frequency dependency of the negative-delay values in the conventional analog synchronous mirror delay. The scheme adopts a new dummy-delay compensation technique by adopting the comparator with inherent systematic offset to achieve the enhanced negative-delay range especially prominent at high frequency applications.

• Proceedings of the KIPE Conference
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• 2017.07a
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• pp.148-149
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• 2017

본 논문에서는 인덕턴스가 작은 BLDC 전동기에서 상전환 시에 나타나는 토크 리플을 저감하는 기법을 제안한다. BLDC 전동기의 홀센서 신호전환 시점에서 상전류를 예측하고 이 전류가 지령치에 미치지 못할 경우 지령전류를 보정하여 스위칭의 듀티비를 새로 계산한다. 제안된 기법은 실험으로 검증된다.

• Proceedings of the KIPE Conference
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• 2014.07a
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• pp.399-400
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• 2014

본 논문은 출력전류에 저역통과필터를 적용함으로써 최적으로 보상할 수 있는 데드타임 보상기법을 제안한다. 제안된 보상기법은 출력전류에 필터보상 알고리즘 적용으로 출력전류의 고조파성분을 저감할 수 있음을 시뮬레이션 해석을 통해 검증한다.

• Journal of Technology Innovation
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• v.2 no.1
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• pp.191-218
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• 1994

This paper aims to find out the R&D personnel management strategies which enhance the productivity of researchers. The R&D personnel management practices are examined focusing on career development and compensation scheme. As proxies for higher motivation and/or productivity, job satisfaction and propensity to leave of researchers are analyzed to evaluate the management practices. Using the survey data from researchers in the Korean automobile industry. this paper suggests the management strategies to raise job satisfaction and thus lower propensity to leave of R&D personnel.

• Proceedings of the KIPE Conference
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• 2016.11a
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• pp.222-223
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• 2016

본 논문에서는 계통연계 인버터에서 비선형부하의 위치에 따라서 발생되는 고조파를 보상하기위한 전류제어 방식을 사용하였다. 비선형부하로 인해 발생되는 고조파는 계통 전압 및 전류의 THD에 많은 영향을 미치기 때문에 이를 보상하는 것이 본 논문의 목적이다. 비선형부하의 위치에 따라서 각각의 경우에 대해 두가지의 고조파 지령값을 선택하는 방식을 사용하였다.

• Proceedings of the KIPE Conference
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• 2016.11a
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• pp.49-50
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• 2016

본 논문에서는 BLDC 모터의 홀 센서의 정렬 오차를 검출하고 보상하는 기법을 제안한다. 합성된 홀 센서 신호를 이용하여 고조파 분석을 수행하여 기본파 성분의 크기를 획득한다. 오차가 없는 경우의 기본파 성분의 크기와 비교하여 정렬 오차각을 검출하고 보상한다.