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히트파이프 및 스택핀을 이용한 50W급 옥외용 LED 모듈개발
홍석기(Seok-Gi Hong),정희석(Hee-Suk Jeong),염정덕(Jeong-duk Ryeom) 한국조명·전기설비학회 2015 조명·전기설비학회논문지 Vol.29 No.12
We proposed 50W-LED modules of using Heat-pipe and Stack-fin and produced LED modules was evaluated heat dissipation characteristics with comparison of the conventional die-casting type. It verified the application of products by applying it to 150W-LED road luminaires through simulation. The LED module was measures aimed design temperature of the Stack-fin and showed 26% upward heat dissipation effect than a conventional die-casting type. The luminous efficacy of 150W-LED road luminaires using this LED module reached over 112lm/W, and the simulation results showed average of horizontal luminance, overall luminance uniformity(UO) and lane luminance uniformity(UI) that is suitable for five-lane road with the KS standards.
홍석기 ( Suk Ki Hong ),김선자 ( Sun Ja Kim ),이혜숙 ( Hae Suk Lee ),김철민,이정은 ( Jung Eun Lee ),김화진 ( Hwa Jin Kim ),최진영,권희서,김기범,김영래,김운혁,끌로띨드,냠델게르,아니자,장성일,한정희,한지혜 서울시정개발연구원 2010 연구보고서 Vol.2010 No.19
Seoul joined global city level party based on its volume and economic capacity, However, it has mainly focused on it`s visible facility expansion in process of development. In order to be one of the world-famous global cities, above all, different strategic approach focusing on the human resource is requested. 300,000 immigrant residents from overseas are no longer aliens in Seoul They are neighbors who has right to live together, equally guaranteed by the law in regardless of their race, language, religion, cultural background. It is time for the tolerance. Seoul, as capital city which represents the Republic of Korea, should embrace the citizen from under-development nations Hence, it is necessary for Seoul to make diverse efforts to become an hopeful city. They come to Seoul not only for their personal reason but also for achieving success, supporting their family and contributing their nations. Namely, Seoul is space for them to make their dream come true. Hereupon, Seoul needs to prepare the policy in which it supports their stabilization, social adoption, social participation and contribution for social development. The concept of social cohesion is a keyword of this research, interpreted as a sense of belonging, mutual interest and positive relationship among community members. This research was developed through three approaches (spatial change, social system change and awareness change) for solving problems of social cohesion and it`s improvement. In Chapter 1, we introduce the necessity and the primary aim of this research and briefly describe its research method, Chapters 2 adopts chronicle approach to summarize the immigrant history in Seoul, It also analyzes formation process and physical characteristics of the foreigner`s communities from spatial point of view and estimates their change in the future. Chapter 3 presents the current situation of the laws and social systems (which is) supporting the foreigners and analyzes the alternative for development of social recognition of global culture by including programs for native Korean. In chapter 4, we present the result of survey focusing on mutual consciousness among foreign residents and interviews with Koreans, foreigners and related institute s employees, Lastly, in chapter 5, we proposes the object and alternative action plan to grow Seoul as a leader class global city. In order to make Seoul as a leader class global city, it is necessary to formulate a system which not only supports foreigner s stable settlement in Seoul but also guarantees their active participation same as natives. If these processes are executed step by step, Seoul gives many chances to the foreigner and they are willing to contribute their assets for developing our society.
청소년기 시민의식의 변화와 학생주도 학습경험의 시간효과
홍석기(Hong, Seokki) 한국청소년정책연구원 2020 한국청소년연구 Vol.31 No.1
본 연구에서는 청소년기 시민의식의 변화 궤적을 탐색하고, 시민의식의 변화 추이에 학생주도 학습경험이 각 시점에서 동시효과와 지연효과를 갖는지 살펴보았다. 이를 위해 경기교육종단연구(Gyeonggi Education Panel Study: GEPS)의 초4패널 자료 중 1차년도(초4), 3차년도(초6), 5차년도(중2), 7차년도(고1)의 4시점 자료를 활용하여, 잠재성장모형(Latent Growth Model: LGM) 분석방법을 적용하였다. 연구결과는 다음과 같다. 첫째, 학생주도 학습경험의 시간효과를 투입하지 않은 무조건 모형에서 초4 부터 고1까지의 시민의식은 시간에 흐름에 따라 선형적으로 증가하는 양상을 보였다. 둘째, 한 시점의 학생주도 학습경험이 동일 시점의 시민의식에 영향을 미치는 동시효과를 검증한 결과, 초4부터 고1까지 모든 시점에서 학생주도 학습경험을 높게 인식할수록 시민의식의 성장에 정적 영향을 미치는 것으로 나타났다. 셋째, 한 시점의 학생주도 학습경험이 이후 시점의 시민의식 변화에 영향을 미치는 지연효과를 검증한 결과, 초4, 초6, 중2 시점의 학생주도 학습경험을 높게 인식할수록 지연시점인 초6, 중2, 고1의 시민의식이 높은 것으로 나타났다. 이상의 결과는 학생주도 학습경험이 시민의식의 변화에 상당한 영향력을 발휘하고 있음을 보여주며, 특히 동일 시점에서의 학생주도 학습경험은 청소년 시기 전반에 걸쳐 시민의식의 증진을 뒷받침하고 있음을 시사한다. 본 연구는 청소년의 시민의식의 변화 양상을 탐색하고, 학생주도 학습경험이 시민의식의 발달궤적에 미치는 영향을 분석하였다는 점에서 그 의의를 찾을 수 있다. 본 연구의 결과를 토대로 청소년 시민의식의 지속가능한 발달을 위해 학생주도 학습경험을 풍부하게 하는 교실의 변화 및 교육정책의 개발에 대해 논의하였다. The purpose of this study was to investigate the changing trajectory of civic consciousness and to examine the time effect of student-led learning experiences on civic consciousness. For the purposes of this study, the 4th-grade panel data of the Gyeonggi Education Panel Study(GEPS) were analyzed using structural equation modeling for simultaneous and lagged models. The results of the analysis are as follows. First, civic consciousness showed a linear increase with time in the unconditional model. Second, as a result of verifying the simultaneous effect that the student-led learning experience had at one point of time and the way it affects the change of civic consciousness at the same point of time, it was found that the higher the recognition of the student-led learning experience, the higher the level of civic consciousness. Third, as a result of verifying the lagged effect that the student-led learning experience had at one point of time affects the change of civic consciousness at the next point of time, the higher the recognition of the student-led learning experience showed high civic consciousness. The significance of this study was to explore the changes in civic consciousness and to analyze the effects of student-led learning experiences on the developmental trajectory of civic consciousness.
신제품 및 서비스에 있어 이분조각 Bass모형에 의한 확산 패턴 분석
홍석기(Seok-Kee Hong),홍정식(Jung-Sik Hong) 대한산업공학회 2010 산업공학 Vol.23 No.4
The Bass model is the most widely used model in research of new product diffusion because it presents a nice explanation on the diffusion process of new products. However, it has a limitation that its performance of fitness is lower as the available data become less and also, the diffusion curve is bell-shape and so, it can not represent the various diffusion patterns. Recently, a two-pieces Bass model is developed and applied to analyze diffusion of 10 products. The results are encouraging in terms of fitness. However, diffusion pattern is not dealt with in the paper. In this paper, analysis of diffusion pattern is in depth addressed in two-pieces Bass model. It is shown that the diffusion curves are divided into 3 types with respect to the peak adoption rate and each type is divided into 2 types further. Takeoff time of a diffusion process is analyzed by using the inflection point and regime-change time where it represents the point that imitation and innovation parameters change. Empirical studies for 68 products(28 domestic products and 40 USA products) are performed to analyze the diffusion pattern. Findings are that diffusion patterns of all products except 1 USA product show typeⅠ and regime-change time becomes shorter as the introduction time of the product is later in domestic products and regime-change time can be regarded as a takeoff time in 47% of total 68 products.