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장성환(Sung-Whan Jang),정병조(Byoung-Jo Jung) 한국조명·전기설비학회 2013 조명·전기설비학회논문지 Vol.27 No.8
The study carried out in this dissertation focuses on the lens structure design and the light distribution for LED safety luminaires using COB type LED module. Lens structures for LED lights has been designed 1) to induce light diffusion by dual process of internal reflection and refraction, 2) to minimize the inherent LED lights glittering, and 3) to have uniform brightness. The lens designed with the proposed structures function as diffusers for the divergence of the LED lights so that they form a wide angle of view and adjust the light distribution. We designed of lens with stable uniformity factor and average roughness using aspheric optics property. Finally we made the analysis data of the simulated data.
역전파 학습알고리즘을 이용한 비선형 동적 시스템 제어에 관한 연구
장성환(Sung-Whan Jang),나상동(Sang-Dong Ra),유인호(In-Ho Yu),조현섭(Hyun-Seob Cho),김기철(Ki-Cheol Kim),최봉식(Bong-Shik Choi) 한국정보과학회 1995 한국정보과학회 학술발표논문집 Vol.22 No.1
미지의 변수를 가진 선형 시스템의 식별과 적응 제어에 관한 연구는 그 동안 성공적으로 연구되어 왔으며 괄목할 만하게 진보되었다. 하지만 기존의 적응 제어 기법은 동적 시스템의 수학적 모형을 필요로 하지만 동적 시스템은 비선형성을 가지고 있으며, 비선형 특성이 심한 시스템의 제어는 아주 어렵다. 본 연구에서는 역전파 학습 알고리즘의 성능 개선과 비선형 동적 시스템에 대한 학습 알고리즘에 대해서 기술하였다. 그리고 실험을 통하여 제안된 미지의 비선형 동적 시스템의 역전파 학습을 고찰하였다.
권의혁,장성환,한정환,김병수,정진기,이재천,Kwon Eui-Hyuk,Jang Sung-Hwan,Han Jeong-Whan,Kim Byung-Su,Jeong Jin-Ki,Lee Jae-Chun 한국재료학회 2005 한국재료학회지 Vol.15 No.1
It is well known that PCB (Printed Circuit Board) is a complex mixture of various metals mixed with various types of plastics and ceramics. In this study, high temperature pyre-metallurgical process was investigated to extract valuable metallic components from the PCB scrap. For this purpose, PCB scrap was shredded and oxidized to remove plastic materials, and then, quantitative analyses were made. After the oxidation of the PCB scrap, $30.6wt\%SiO_2,\;19.3wt\%Al_2O_3\;and\;14wt{\%}CaO$ were analyzed as major oxides, and thereafter, a typical composition of $32wt\%SiO_2-20wt\%Al_2O_3-38wt{\%}CaO-10wt\%MgO$ was chosen as a basic slag system for the separation of metallic components. Moreover a size effect of crushed PCB scrap was also investigated. During experiments a high frequency induction furnace was used to melt and separate metallic components. As a result, it was found that the size of oxidized PCB scrap was needed to be less 0.9 m to make a homogeneous liquid slag and to recycle metallic components over $95\%$.