http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
DC-DC buck converter의 CCM/DCM 동작 모드에 따른 파워 스펙트럼 분석 및 EMI 영향에 관한 예측
신효섭(Hyo-Sub Shin),김지훈(Ji-Hoon Kim),김소영(So-Young Kim) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.11
There are 2 modes in DC-DC buck converter in terms of inductor current, CCM/DCM mode. In this paper, by using LT3411 controller from Linear Technology, we designed DC-DC buck converter. We predict EMI problem between both modes by using power spectrum analysis.
몬테 카를로 시뮬레이션을 통한 발사관 구조 안전성 분석
박철우,이온수,신효섭,박진용,이동주,Park, Chul-Woo,Lee, Onsoo,Shin, Hyo-Sub,Park, Jin-Yong,Lee, Dong-Ju 한국시뮬레이션학회 2018 한국시뮬레이션학회 논문지 Vol.27 No.4
Launching system is designed to store the payload, withstand the rigors, and prevent it from rusting and damaging. The behavior during initial deployment of the missile is determined by production, assembly and insertion condition of a launching tube and a missile. The purpose of this research is to confirm the safety of a launching tube by statistically analyzing behavior of the missile, during initial deployment stage. Error parameters which effect initial behavior of the missile are selected and analyzed through Monte-Carlo Simulation. Based on the result of simulation, tip-off and stress distribution between rail and shoe is predicted by using the commercial analysis program called Recurdyn. Lastly, the safety factor is calculated based on yield strength of the material and maximum stress of the rail during the process of launching. The safety of the launching system is verified from the result of the safety factors. 발사관은 탑재물을 보관하고 외부 환경으로부터 부식 및 파손되는 것을 방지하는 역할을 한다. 발사관과 유도탄의 제작, 조립 그리고 장입 상태에 따라 발사할 때 유도탄의 초기 거동을 결정하게 된다. 본 연구의 목적은 유도탄이 발사관에서 사출될 때 유도탄의 초기 거동을 결정하는 요소를 통계적으로 분석하여 발사관의 안전성을 확인하는 것이다. 유도탄이 발사될 때 거동에 영향을 주는 오차 요소들을 선정한 후 Monte-Carlo 시뮬레이션을 수행하여 통계적으로 분석하였다. 시뮬레이션 결과를 바탕으로, 각 오차 요소들을 고려한 다물체 동역학 해석을 상용프로그램인 Recurdyn을 이용하여 동역학 해석을 수행하여 유도탄 발사할 때 발생하는 중력 침하 및 레일과 슈 사이에 발생하는 응력을 구하였다. 해당 결과를 바탕으로 현재 설계된 발사관에 대한 안전성을 검증하였다.
정용기,곽희로,신효섭,정춘병,남택주,Chung, Young-Ki,Kwak, Hee-Ro,Shin, Hyo-Sub,Chung, Chun-Byoung,Nam, Taik-Joo 한국전기기술인협회 2001 電力技術人 Vol.228 No.8
전기설비 분야에서는 사용하는 전압규격과 사용방식, 접지 System이 어떻게 조화를 이루냐에 따라 안전에 대한 확보여부가 결정된다. 지락 사고시 지락전류는 일정한 어느 한 부분으로만 흐르는 것이 아니라 접지저항의 상황에 따라 분류한다. 이러한 이유로 접지사항이 낮으면 안전하고 높으면 위험하다는 일반적인 잘못된 생각이 사고를 크게 확대시킬 수 있다. Presently the Korean grounding system uses TN system, multi-grounding method with IT independent grounding method. Nevertheless TN system can't exist with TT system in the technological terms. If they coexist, it causes ground-fault circuit not to operate, and brings about different electrical potential rise by customer system. It brings about serious problems for safety. This paper aims for improving method of grounding system based on the technical analysis on instances in foreign countries and Korea. Almost standards and construction manner were apt to be internationalized after WTO/TBT agreement was concluded. The internal grounding systems should meet the international criteria and reliability for safety, and be provided with technologically impeccable standards.
순차 컨벡스 프로그래밍을 이용한 충돌각 제어 비행궤적 최적화
권혁훈(Hyuck-Hoon Kwon),신효섭(Hyo-Sub Shin),김윤환(Yoon-Hwan Kim),이동희(Dong-Hee Lee) 대한전기학회 2019 전기학회논문지 Vol.68 No.1
Due to the various engagement situations, it is very difficult to generate the optimal trajectory with several constraints. This paper investigates the sequential convex programming for the impact angle control with the additional constraint of altitude limit. Recently, the SOCP(Second-Order Cone Programming), which is one area of the convex optimization, is widely used to solve variable optimal problems because it is robust to initial values, and resolves problems quickly and reliably. The trajectory optimization problem is reconstructed as convex optimization problem using appropriate linearization and discretization. Finally, simulation results are compared with analytic result and nonlinear optimization result for verification.
정용기(Chung-Yong Ki),신효섭(Shin-Hyo Sub),지철근(Cjee-Chol Kon),김영수(Kim-Young Soo) 한국조명·전기설비학회 2002 한국조명·전기설비학회 학술대회논문집 Vol.2002 No.-
An arc/spark detector (ASD) was developed is to early detect wire failures and insecure connections that may lead to fire in residents and commercial and industrial facilities. A detailed circuit design for ASD implementation along with prototype product is reported. The tests of ASD, which were successful in phase identification in many different arc/spark locations under different loadings, and in false alarm probability, showed the ability and capability of the state-of-the-art detector in the electric fire hazard prevention.