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LVRT/HVRT System 모델 개발 전략에 관한 연구
김병기(Byungki Kim),유경상(Kyungsang Ryu),남양현(Yanghyun Nam),김찬수(Chansoo Kim),고희상(Heesang ko),김미성(Misung Kim),박재범(Jaebum Park),김대진(Daejin Kim) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.7
본 논문에서는 대용량 풍력발전기를 대상으로 일정기준이상 연계운전 능력을 평가할 수 있는 10MW급 이상의 LVRT(Low voltage Ride Through)/HVRT(Low voltage Ride Through)기능 모의가 가능한 시험장비의 개발 방안을 제안한다. 즉 RLC 방식의 단점을 보완한 단권변압기를 기반 탭 변환 방식시험장치의 권선비 조정 모델을 제안한다.. 상기에서 제안한 설계 및 운영 방안을 바탕으로 구현한축소형 LVRT/HVRT 시험장비의 성능시험을 통해 본 논문에서 제시한 설비의 유용성을 확인하였다.
김양현(Kim, YangHyun),조현빈(Jo, HyunBin) 한양법학회 2010 漢陽法學 Vol.32 No.-
In the 2000s, a series of gun robbery cases happen across the country of Korea including not only large cities like Seoul, Daegu and Daejeon but small-and middle-sized cities like Gyeongju, Seosan and Gunsan. Moreover, lots of international violence organizations with guns flow into Korea, where the culprits use their gun to commit crimes. So, it is unavoidable for the police to use guns in repressing robbery and other brutal crimes using guns. Excessive use of guns should be restrained, but permission must be given for police officers to use guns in such an urgent situation as to protect the life and property of the people and the officers themselves. In this regard, this research aims to give concrete directions to indistinct criteria of judicial precedents for police to use weapons and to compare domestic criteria with those of foreign countries, with a view to proposing systematic and detailed criteria. To do that, investigations have been made into the theoretical background of this research, concepts and laws for the Korean police to use weapons, and requisites for the police to use weapons. In order to analyze judicial precedents about the police’s use of weapons, legal use of weapons has been separated from illegal use. The analysis has contributed to understanding the criteria for police officers to use weapons. Furthermore, in order to analyze the content of the judicial precedents, the police’s use of weapons has been classified into legal use and illegal use of weapons. First, the characteristics of suspects are analyzed with a focus on ① their sex, ② number of them, ③ drinking or non-drinking, ④ casualties, ⑤ kind of their crime, ⑥ kind of weapons they possess, ⑦ aspects of possessing and using the weapons, ⑧ resistance to police officers, and ⑨ warning and changes after warning shots. Second, the characteristics of suspects are analyzed with a focus on ① their sex, ② number of them, ③ asking for support or not, ④ oral order, ⑤ warning shots, ⑥ ball firing, ⑦ distance of shots, and ⑧ aiming directions. Third, the characteristics of the scene are analyzed with a focus on ① timing, ② existence of a third party, ③ location of the scene of action, and ④ imminence of the harm. Lastly, the present author gives suggestions for the nation’s policies. First, legislation on the police’s use of weapons need be improved. So, it is necessary that the relevant laws should more clearly stipulate the conditions and limits for the police to use weapons. And some considerations should be taken into the preparation of a manual which proposes objective criteria for the scope of permission to use a gun police officers can follow on a criminal spot. Furthermore, regulations should be newly established to compensate for the damages caused by the police’s use of weapons, schemes prepared to resolve personal disadvantages, and ex post factor relief systems reformed. Second, systems for the police to use weapons need be improved. Current education and training on the use of weapons should be upgraded with more realistic programs like a simulation. Moreover, alternative weapons need be introduced and/or developed so that police officers may use other weapons than a gun to overpower criminals, with a view to minimizing the police’s damages. Third, justifications for the police’s use of weapons need be improved. To do that, citizens’ recognition of the police’s use of weapons should be enhanced. In addition, PR activities need be intensified to advertise the said justifications. Fourth, as a way to improve a system to treat the police after their use of weapons, consideration should be taken into new establishment of the provisions about compensation for damages and into schemes to get rid of personal disadvantages. Fifth, schemes are suggested to introduce gun and other alternative weapons in relation to the police’s use of weapons. Of the above suggestions, what i
후방카메라모듈의 system level 불량분석을 위한 ESD 예측해석기술에 관한 연구
김양현(Yanghyun KIM),서철헌(Chulhun Seo) 대한전자공학회 2020 전자공학회논문지 Vol.57 No.9
본 논문에서는 simulation 기술을 이용한 후방카메라모듈의 Electrostatic Discharge(ESD) 불량분석을 위한 예측기술에 관한 연구를 제안한다. 그리고 제안된 후방카메라모듈의 ESD 불량분석과 EC61000-4-2 테스트 조건을 만족하기 위해 적합한 카메라 정전기 방전(ESD) 시뮬레이션 방법이 개발되었다. ESD 인증시험에는 contact discharge와 air discharge가 있으며 본 논문에서는 contact discharge 조건에 기반 하여 비교 분석하였으며 시험조건은 ESD 국제표준규격인 IEC61000-4-2에 따라 시뮬레이션 모델링을 구현하였고 동일조건으로 결과를 비교 하였다. 본 연구에서는 제안된 ESD Simulation을 이용한 불량분석 기술을 적용하여 실측과 simulation결과를 비교하여 동일한 결과를 얻었다. In this paper we propose a study on prediction technology for Electrostatic Discharge(ESD) defect analysis of rear camera module using simulation technology. In addition, a suitable ESD simulation method was developed to satisfy the ESD defect analysis of the proposed rear camera module and the IEC61000-4-2 test condition. The ESD certification test includes contact discharge and air discharge. In this paper, comparative analysis was performed based on the contact discharge condition and simulation modeling was implemented according to the ESD international standard, IEC61000-4-2 and the results were compared under the same conditions. In this study, the same results were obtained by comparing the actual measurement and simulation results by applying the proposed defect analysis technique using ESD simulation.