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조은석(Eun Seok Cho),이일환(Il Hwan Lee),김민수(Min Soo Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
In recent years, many investigations have been conducted for microchannel heat sinks with MEMS technologies for electronics cooling, but few investigations have been performed to design optimal header for two phase microchannel heat sinks. In general, mass flow distribution in multi-channel heat sinks is strongly determined by geometric parameters of the header of microchannels. This simulation work investigates the impact of mass flow distribution in multi-channel heat sinks to provide optimal geometric parameters for header design, under given geometric criteria. Absolute average deviation, root mean squared deviation, total pressure drop, and area ratio (header area over microchannel area) are calculated with respect to n, the geometric parameter of header shape. Mass flow distribution among microchannels is not changing much under a certain value of n.
조은석 ( Eun Seok Cho ) 창조교육학회 2010 창조교육논총 Vol.12 No.-
Creativity education in the U.S.A. was started from the universities by professors J. P. Guilford`s and E. Paul Torrance`s influence in 1950. Professor Howard Cardner at Harvard University presented are search for “Educational curriculum for cultivating creativity in middle school, high school, and university” in 1997, and the education of cultivating creativity has been conducted in depth even in middle school and high school through all the areas of the U.S.A. Educational policy is being conducted independently by each state in Canada, and creativity education in middle school, high school and university in British Columbia has been substantially conducted after the state government presented the curriculum of educational innovation in 1990. In the United Kingdom, National Recommendation Committee of Education for Creativity and Culture was organized and creativity education in middle school, high school and university has been deeply conducted by the committee activities. In Germany, professor Muhle & Schell presented a thesis of “Creativity and School Education” (1970) and emphasized the education for cultivating creativity, and then creativity education has been conducted in middle school, high school, and university in the whole area of Germany. In Finland, Education for cultivating creativity in the school had been emphasized since 1980s and creativity education was realized in the school. In Spain, creativity education has been deeply progressed under the guidance by Professor David de Prado Dez at Santiago Compostera University. Insead, prestige European Institute of Business Administration at France, is a worldwide international graduate school of business administration, and the lecture on creative education is opened and instructed substantially. Japan, China, South Korea In East Asia, Education for cultivating creativity in the school had been emphasized. The world is confronted with lots of crises currently; there are many individual and social issues to be solved in our lives, such as creative innovation in business competitions, global warming, frequent occurrence of typhoon and hurricane, etc. To search for the solutions of such difficult issues, creative problem solving is necessary and it is recognized that creativity education is urgent. I reviewed the execution of creativity education in the Western countries under the trends of Western educational innovation and hope such result would largely contribute to the reference and educational improvement of the execution of creativity education in Korea.
The Research of Bi-Directional step up-down simple H-bridges inverter for Green Car or Light System
Cho, Eun Seok(조은석),Ko, Jae Su(고재수),Lee, Yong Keun(이용근) 한국전시산업융합연구원 2014 한국과학예술융합학회 Vol.18 No.-
The inverter is widely used for the Green car and High Power Light System. Conventional sinusoidal Inverter(DC-AC conversion system) has a power loss from the wrongly controled switching device due to their own falling and rising time1)2). In this paper, we propose the new method to add the proper dead time and which can work for step down operation. Especially, bi-directional operation is necessary for electronic(hybrid)car and UPS system. For this purpose we propose the novel control method for step-up operation when it works for AC-DC operation without additional converter only using H-Bridge inverter.
조은석 ( Cho Eun-seok ),임정준 ( Lim Jeong-jun ),송하영 ( Song Ha-young ),이상수 ( Lee Sang-soo ) 한국건축시공학회 2019 한국건축시공학회 학술발표대회 논문집 Vol.19 No.2
Light-weight foamed concrete using cement as a raw material consumes a lot of energy and generates CO2 because of the high temperature firing process in the manufacturing process of cement. This study was carried out to evaluate the use of blast furnace slag through the properties analysis by substituting a certain amount of blast furnace slag as an industrial by-product as a substitute for cement. The experimental results showed similar characteristics to those of using only cement when the blast furnace slag fine powder was used in an appropriate amount. Therefore, if a certain amount of cement is replaced with blast furnace slag powder, it can maintain similar quality, reduce natural resources and energy consumption, and reduce carbon dioxide emissions.
친환경 자동차, 대용량 조명장치 등에 적용을 위한 승/강압이 가능한 양방향 H-Bridge Inverter 에 관한 연구
조은석 ( Eun Seok Cho ),고재수 ( Jae Su Ko ),이용근 ( Yong Keun Lee ) (사)한국전시산업융합연구원 2014 한국과학예술융합학회 Vol.18 No.-
The inverter is widely used for the Green car and High Power Light System. Conventional sinusoidal Inverter(DC-AC conversion system) has a power loss from the wrongly controled switching device due to their own falling and rising time1)2). In this paper, we propose the new method to add the proper dead time and which can work for step down operation. Especially, bi-directional operation is necessary for electronic(hybrid)car and UPS system. For this purpose we propose the novel control method for step-up operation when it works for AC-DC operation without additional converter only using H-Bridge inverter.