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양승진(Seungjin Yang),유정훈(Jeonghoon Yoo) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
The machine locking system is an important device for the safety of persons using the machine. Therefore, the locking system using electromagnetic fields was proposed to decrease defects, the cost of repairing and maintenance for the existing locking system using structural mechanism. We analyze the EM locking system and calculate the generated force by the finite element method. The optimal topology is obtained by the sensitivity analysis. And the obtained optimal topology is confirmed the improved design comparing with the initial locking system.
소규모 건축물에 적용된 SCW 형식의 GWHP 시스템의 운전방식에 따른 냉난방시 지하수 온도 특성에 관한 연구
양승진(Yang Seung-Jin),김주영(Kim Ju-Young),홍원화(Hong Won-Wha),안창환(Ahn Chang-Whan) 대한건축학회 2009 대한건축학회논문집 Vol.25 No.6
Standing column well(SCW) in ground water heat pump(GWHP) system that is well known for the high efficient heating and cooling system was introduced in Korea 2004, and has been applied in large facilities. Therefore the research of optimum planning of the standing column well for small facilities should be made. Accordingly, this research is aimed to understand the characteristics of underground water as heating and cooling source of the standing column well system that is applied in a small building in accordance with operation methods during heating and cooling. And these results also offers DB(database) for planing of the efficient standing column well systems, which are able to prevent the waste of underground water. For this research, the thermocouples were installed at 10 spots in the well, and the data on temperature of underground water were collected through the data logger all the year round. And temperature changes of the underground water were analyzed by shifting the operation methods of the standing column well system. Differences in the temperature of underground water in accordance with operation methods are clearly defined. Therefore, these findings are expected to contribute to constructing DB required for the optimum planning of small-scale SCW in GWHP system.
레이저의 피부 흡수에 의해 발생하는 축 방향 변위의 펄스 폭 의존성에 관한 연구
양승진 ( Seungjin Yang ),백준혁 ( Junhyeok Baek ),김재영 ( Jaeyoung Kim ),장경민 ( Kyungmin Jang ),박종락 ( Jongrak Park ) 조선대학교 공학기술연구원 2015 공학기술논문지 Vol.8 No.3
In this study, simulations of the axial displacement generated in human tissues by pulsed laser absorption were executed. The temporal width of the laser pulse was varied from 1 ns to 1000 ns, while the pulse energy and the beam diameter were set to 9.6 mJ and 0.5 mm, respectively. It was found that the magnitude of the axial displacement decreased as the laser pulse width increased. When the laser pulse width was ~500 ns, the magnitude of the axial displacement dropped to half of that for the 1-ns pulse width. The magnitude of the axial stress was also examined and found to be rapidly reduced with the increase of the laser pulse width.
대학 기숙사에 도입된 SCW GWHP 시스템의 경제성 평가에 관한 연구
양승진(Yang Seung-Jin),김재민(Kim Jae-Min),김주영(Kim Ju-Young),홍원화(Hong Won-Hwa),안창환(Ahn Chang-Hwan) 한국건축친환경설비학회 2008 한국건축친환경설비학회 논문집 Vol.2 No.4
These days, Energy problem has been a serious issue due to continuing high oil price and exhaustion of resource. Especially, the energy in apartment house like dormitory has been consumed recklessly. As a solution for this energy problem. it is urgent to applicate alternative energy, that is, renewable energy. In this sense, this study analyzed economic evaluation of geothermal heat pump system. First, comparison between existing gas heat pump system and geothermal heat pump system was preceded and follow the analysis of annual energy reduction amount according to early investment prices and operation expenses. As a result, it was show that geothermal heat pump system used only 13% of existing system energy expense. This study will attribute to inform the excellence of geothermal heat pump system and be used as source materials for the application of apartment house in.
양승진(Yang, Seung Jin),이정웅(Lee, Jung Woong),박기범(Park, Ki Bum),윤미경(Yun, Mi Kyoung),박성용(Park, Seong Yong) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.06
태양전지에서 고효율을 얻기 위해서는 알루미늄 원자의 확산에 의한 불순물층으로서 p+층이 필수적이다. P+층은 형성전자의 재결합을 방지하고, 생성 캐리어의 수집 효율을 향상시키는 BSF(Back Surface Field) 효과의 역할을 한다. 도포된 알루미늄 페이스트가 부족할 경우 BSF효과가 나타나지 않으며 과할 경우 웨이퍼가 휨이 발생하여 최적 인쇄도포량이 중요하다. 본 연구에서는 레오미터 측정조건을 스크린 프린팅 인쇄 조건과 유사하게 진행하여 저장탄성율(G') 과 손실탄성율(G)의 관계를 살펴보았다. 회복단계에서 G'>G 이고 Cross point가 없을 경우 도포량이 1.8g 이상이였으며, 웨이퍼의 휨(bowing)이 크게 발생하였고, 이와 반대로 회복시 20초 후에 Cross point가 나타난 경우 10% 정도 도포량 감소와 함께 휨 발생도 1 mm 이하로 양호한 특성을 확인할 수 있었다.