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백색 LED 보정 공정 적용을 위한 고점도 형광체 미세 정량토출 공정
양봉수(Bong Su Yang),양영진(Young Jin Yang),김형찬(Hyung Chan Kim),고정범(Jeong Beom Ko),조경호(Kyung Ho Cho),도양회(Yang Hoi Doh) 한국생산제조학회 2016 한국생산제조학회지 Vol.25 No.2
Several research works for finding and optimizing the methods of dispensing high viscosity phosphor used in the fabrication of white LED’s are currently in progress. High viscosity phosphor dispensing with a high accuracy is crucial because the dispensing rate and uniformity directly affect parameters such as the CIE chromaticity diagram, color temperature and luminous flux of white LED’s. This study presents a novel method of dispensing high viscosity phosphor using electrohydrodynamic printing. The dispensing rate was optimized less than 0.01 mg phosphor using experiments and optimizing the process parameters including the standoff distance from the nozzle to the substrate, ink supply pressure, and multi-step pulsed waveform magnitude ratio. The dispensing rate was measured by dispensing 20 dots using drop-on-demand with the optimized parameters, and the experiments were repeated 10 times to maximize the data accuracy. The average dispensing rate that can be reliably used for high viscosity phosphor dispensing was 0.0052 mg.
피드백 제시방법이 남자 고등학생들의 멀리뛰기 기록과 파지에 미치는 영향
양봉석(Bong Suk Yang),이강헌(Kang Hun Lee) 한국체육교육학회 2002 한국체육교육학회지 Vol.7 No.3
The purposes of this study are to study select representative teaching-learning models, analyze activities useful for those models, and explain the results of these activities on Long Distance Jump of high school male students. Under the condition of the summary feedback, fade feedback and no-feedback method, the Long Distance Jump is tested by them twice per a week for 8 weeks. Concrete research conclusion of this study are the following ; 1. The group students offered retention feedback and fade feedback method have better effect than the no-feedback group students does. 2. As the learning term are longer, all groups have good points all the above methods. 3. The summery feedback method and fade feedback method groups are obtained better retention than the no-feedback method groups are. Being based on the above study. I would like to say about kinds of the method to improve student`s physical activities accomplishment. First, what is offered a feedback method, if we are checking per activity learning periods, each group effects caused rather lower activity for the students. Because the activity memory power is overcharged. In conclusion, physical instructors and teachers should offer a suitable method when they offer each method. Second, if we offer each method each group, physical instructors and teachers had better use various methods according to the condition to gain better effect.
LCC분석에 의한 오피스건축물의 최적경제수명추정분석 및 장수명화에 관한 연구
양봉석,정희철,김경래,Yang Bong-Seog,Jeong Hee-Cheol,Kim Kyung-Rai 한국건설관리학회 2001 건설관리 : 한국건설관리학회 학회지 Vol.2 No.4
본 연구는 오피스건축물의 최적경제수명을 Life Cycle Cost를 고려하여 추정분석하고, 이를 통해 최적경제수명 이후의 건축물을 어떻게 관리하는 것이 경제적으로 유리한가에 대한 것이다. 경제수명의 추정에서 초기투자비와 유지관리비를 중요한 요소로 고려하여, 여의도$\cdot$마포지역의 오피스건물을 대상으로 조사한 내용을 단위면적 당 동일한 가치로 환산한 뒤, LCC를 이용하여 최적경제수명을 추정하였다. 마지막으로 최적경제수명 이후의 관리방법으로 재건축 및 보수공사 시 투입되는 금액에 따라 5개의 안으로 비교하였다. The purpose of this study is to estimate and analyze the optimum economic life of office buildings in consideration of their LCC (Life Cycle Cost), and thereby, explore the ways to manage the outlived office buildings economically. In estimating the economic life, initial investment cost and maintenance cost are taken into due consideration. For this study, those office buildings in Yeouido and Mapo region were sampled. The surveyed details were reduced to unit area to calculate a unit value, and then, their optimum economic life was estimated using LCC. Five alternatives for management of outlived office buildings were compared in terms of reconstruction or rehabilitation cost.