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조보형 대한전기학회 1995 전기의 세계 Vol.44 No.8
우리나라에서 공과 대학 학생들의 효율적인 교육을 위하여 유사학과의 계열별 통폐합이 추진되고 있는 바, 현 시점에서 미국에서 논란되어지고 있는 전기공학 교육과정의 내표하고 있는 많은 문제점이 미국 뿐만 아니라 한국에서도 공통적인 문제점들임을 감안할 때 미국의 여러 기관, 학교 등에서 연구, 계획, 실행되어가고 있는 교과과정에 대해 그 방향을 정리 검토하여 한국의 전기공학 교육발전에 참고하려 한다. 미국 대학에서 일반적으로 시행되고 있는 교과과정 및 제도는 한국과 거의 유사하다고 볼 수 있다. 그러므로 일상적인 제도에 관한 것을 포함시키지 않고 현재의 공통적인 문제점들을 개선하고자 하는 새롭고 창의 적인 개혁 방안들을 중심으로 정리하였다. 이 글에서는 한국 사회의 현실성이란 변수를 감안하지 않고 미국의 전기공학교육의 방향을 객관적으로 검토하는데 촛점을 두었다.
Digital Control of a Power Factor Correction Boost Rectifier Using Diode Current Sensing Technique
신종원,조보형,현병철 전력전자학회 2009 JOURNAL OF POWER ELECTRONICS Vol.9 No.6
In this paper, a digital average current mode control using diode current sensing technique is proposed. Although the conventional inductor current sensing technique is widely used, the sensed signal of the current is negative. As a result, it requires an additional circuit to be applied to general digital controller ICs. The proposed diode current sensing method not only minimizes the peripheral circuit around the digital IC but also consumes less power to sense current information than the inductor current sensing method. The feasibility of the proposed technique is verified by experiments using a 500W power factor correction (PFC) boost rectifier.
한국형 발화지점 추정 기법에 관한 연구 (탄화된 종이벽지 성분분석을 중심으로)
이영민,조보형,김철수,김만종,신현희 한국화재감식학회 2016 한국화재감식학회 학회지 Vol.7 No.3
This study describes the techniques to analyze the components of carbonized paper wallpapers in fire scenes and estimate the ignition point. The conventional ignition point estimation methods include a number of techniques from the US' NFPA 921 and Japan's TFD Materials Information, such as wood carbonization depth measurement, gypsum boards calcination measurement, and metal deformation analysis. In the United States and Japan, these techniques can be applied well to various fire scenes because most housing buildings are finished with gypsum boards and paints. However, in the case of Korea, there are limitations in applying the above techniques as most buildings are finished with wallpapers on fire- resistant substances or mortar. Wallpapers are carbonized in a fish scale shape by the radiant heat generated at the ignition point, and the carbonized wallpapers show differences according to their locations. The amounts of the soot left on the wallpapers also vary. Nonetheless, there are no academic theories or studies conducted in relation to this. The purpose of this study is, therefore, to analyze the components of carbonized wallpapers collected from fire scenes and tests, and to establish ignition point estimation techniques that can be applied to fire cases in Korea
A Novel Soft-Switching Full-Bridge PWM Converter with an Energy Recovery Circuit
이동영,조보형,박종후 전력전자학회 2009 JOURNAL OF POWER ELECTRONICS Vol.9 No.5
This paper proposes a new phase-shift full-bridge DC-DC converter by applying energy recovery circuits to a conventional full-bridge DC-DC converter in plasma display panel applications. The converter can achieve soft-switching in main-switches by an extra auxiliary resonant network even with the wide operating condition of both output load and input voltage. The un-coupled design guidelines to the main bridge-leg component parameters for soft-switching operation contribute to conduction loss reduction in the transformer primary side leading to efficiency improvement. The auxiliary switches in the resonant network also operate in zero-current switching. This paper analyzes the operation modes of the proposed scheme and presents the key design guidelines through steady state analysis. Also, the paper verifies the validity of the circuits by hardware experiments with a 1kW DC/DC converter prototype.
Unified Power Quality Conditioner for Compensating Voltage Interruption
한병문,조보형,설승기,김재언 대한전기학회 2006 Journal of Electrical Engineering & Technology Vol.1 No.4
- This paper proposes a new configuration for the Unified Power Quality Conditioner,which has a DC/DC converter with super-capacitors for energy storage. The proposed UPQC can compensate the reactive power, harmonic current, vovoltage interruption. The performance of the proposed system was analyzed through simulations with PSCAD/EMTDC software. The feasibility of system implementation is confirmed through experi-mental works with a prototype. The proposed UPQC has ultimate capability to improve the power quality at the point of installation on power distribution systems and industrial power systems.