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김장윤,황재승,홍성목 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)
Modal mass is essential to analyze structural response under disturbance and to design the vibration control devices used to enhance the serviceability of structure. Modal mass differs from that of analytic mathematical model due to the error generated from analytical assumption and construction. Therefore, the objective of this study is to proposed to calculate the modal mass of structure based on the system identification. And the proposed method is applied to two examples, the single DOF system and the slab of apartment.
김장윤(J.Y. Kim),현동훈(D.H. Hyun),서정철(J.C. Seo) 한국생산제조학회 2010 한국공작기계학회 추계학술대회논문집 Vol.2010 No.-
This study is aimed to develop micrimini telephoto optical system using board camera. Spheric glass lenses and aspheric mirrors are used to complement limits of telephoto efficiency in existing board camera optical system. Further more a new optical market may be opened because inaccessible place such as natural disasters and industrial accidents can be observed.
다중 확장 가능한 Downlight용 LED 조명 모듈에 관한 연구
김장윤(J.K Kim),현동훈(D.H. Hyun),서정철(J.C. Seo),권순필(S.P. Kwon),문재일(J.I. Moon) 한국생산제조학회 2010 한국공작기계학회 추계학술대회논문집 Vol.2010 No.-
This study's goal is developing modules of LED lighting for multi expandable Downlight. We are making it as occasion demands multi expandable, compact, kept reduced glaring and even light uniformity compared with existing LED lighting for Downlight by developing aspheric lens shaped sheets. Now we finished a design and a simulation, and we are developing Mock-up.
광효율 향상을 위한 LED 패키지 표면의 광학패턴에 관한 연구
김장윤(Jang yun Kim),이동재(Dong Jae Lee),정태봉(Tae Bong Jung),현동훈(Dong Hoon Hyun),노명재(Myeong Jae Noh) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
This study’s goal is improving light efficiency by patterning on LED package. On this, optical patterns, designed and analyzed by optical simulation program. mainly pattern is pyramid pattern and the most efficiency degree was 80. Because of difficulty in manufacturing, we research about improving efficiency by various methods.