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개에서 시행한 한쪽 이식 폐의 99m Tc - MAA 관류스캔
전석길(S . K . Zeon),류종걸(J . G . Ryu),박창권(C . K . Park),유영선(Y . S . Yoo),정덕수(D . S . Jung),이종길(J . K . Lee) 대한핵의학회 1997 핵의학 분자영상 Vol.31 No.3
N/A The aim of this study is to evaluate the efficiency of the pulmonary perfusion scan(Pp scan) in the experimental animal single lung transplantation. Eight left lung transplanted mongrel dogs were included in this study. The serial Pp scan with 111M.Bq 99mTc- MAA were done at the periods of immediate postoperative period, POD 3 days, and POD 10-14 days and finally autopsy was done in each cases. The transplanted lung perfusion was analysed as a percentage radioactivity of transplanted/native lung(T/N) ratio. The Pp scan of a donor mongrel dog was used as a reference(left/right lung (T/N) ratio : 85.2%). The average T/N ratio of all cases on immediate postoperative state(reperfusion injury) : 19.2%, three acute rejections : 12.6%, three bronchial dehiscences : 6.1% and two pulmonary thromboses : 2.0% Two cases showed moderate improvement of reperfusion injury as increasing the T/N ratio in POD 3 days Pp scan. The T/N ratio showed sequentially decreased in six cases. As a conclusion, the Pp scan could be a noninvasive method in the evaluation of the experimental one-lung transplanted mongrel dog.
VRCS(Valve Remote Control System)의 적용설계에 관한 연구
박창권,김태형,정원지 한국공작기계학회 2002 한국공작기계학회 춘계학술대회논문집 Vol.2002 No.-
At present most mechanical design engineers use the techniques that perform shape modeling, force analysis and DMU(Digital Mok-Up). This kind of design methods shorten the time of manufacturing prototypes and have a merit that decreases development cost. But a hydrauric system has inconvenience that engineers have to modify, and complement whenever needed, because simulation-based approaches are not ubiquitous compared to the case of general mechanical parts. This paper presents a case study of efficient application to hydrauric system for designing VRCS(Valve Remote Control System) using a Hycdraulic system design and analysis software.
정원지,박창권,홍대선 한국공작기계학회 2004 한국생산제조학회지 Vol.13 No.2
This paper presents a new optimization technique of acceleration curve for dynamic structure's movement in which high speed and low vibration are desirable. This technique is based on a genetic algorithm with a penalty function for acceleration optimization under the assumption that an initial profile of acceleration curves constitutes the first generation of the genetic algorithm. Especially the penalty function consists of the violation of constraints and the number of violated constraints. The optimized acceleration of the crane through the genetic algorithm and commercial dynamic analysis software has shown to have accurate movement and low vibration, compared to the conventional accelerations with jerk discontinuity.