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이상철,상균영,구자철,서영호,Lee, Sang-Chul,Xiang, Jun-Yong,Gu, Ja-Chul,Suh, Yung-Ho The Korean Operations Research and Management Scie 2006 經營 科學 Vol.23 No.2
The purposes of this research are to identify causalities among flow and customer loyalty In Chinese online games, and to identify the factors by which flow are influenced. This research tests the model with Chinese on-line game users and compare this result with Korea and Japanese results which were conducted by Lee's research. These implications are thought to be helpful for Korean online game companies to understand the Chinese online game user and to develop the penetration strategies. The results indicated that significant Path coefficients to flow were the convenience of operator, the provision of information, the reality of design. The results indicated that significant path coefficients to customer loyalty were the involvement of virtual community and flow. The involvement of virtual community to flow was not significant but to customer loyalty was significant. The provision of information was negatively influenced on flow. The result of comparison indicated that the path coefficients were different among nations. Korea online game companies need to develop the indigenized online game and to Provide the information to their Chinese partner correctly and quickly.
유전알고리즘을 이용한 정지궤도위성의 경도획득 기동계획 연구
이상철,김해동,석진영 한국항공우주학회 2012 한국항공우주학회 학술발표회 논문집 Vol.2012 No.11
현재 위성과 유인 우주비행체는 우주파편과의 충돌위험이 증가하고 있으며, 그로인해 인간 생명이나 재산상의 손실이 발생할 가능성도 함께 증가하고 있다. 미국 NASA와 우주정찰 네트워크는 지름 10㎝ 이상의 우주 물체가 약 22,000 여개에 상당하는 것으로 추정하고 있다. 특히 정지궤도에서 운용중인 위성은 약 300여기에 달한다. 본 연구에서는 정지궤도 위성의 효과적인 경도획득을 위한 기동계획방법을 찾는 것이다. 이를 위해 유전자 알고리즘이 운용중인 다른 위성과의 충돌확률을 낮추는 기동시작시각과 기동크기를 결정하기 위해서 사용되었다. 제안된 방법을 시뮬레이션을 통하여 검증하였다. A satellite or a manned spacecraft orbiting the earth may face a collision with space debris or satellite operated, which results in catastrophic mission failure or a loss of human life and property. The NASA and U.S. Space Surveillance Network estimates that more than 22,000 objects with the size of greater than 10 ㎝ in diameter are orbiting around the earth. Especially about 300 geostationary satellites are operated on geostationary orbit. In this paper, efficient longitude acquisition maneuver is sought for geostationary satellites. A genetic algorithm is used to get the maneuver start time and delta-V that reduce the collision probability with the satellites operated on GEO. The numerical simulation demonstrates the feasibility of the proposed algorithm for GEO satellites
이상철,박승우,감설화,최진오,이왕수,김학진,조성운,김성해,신대희,한주용,강이석,이흥재 대한심장학회 2006 Korean Circulation Journal Vol.36 No.9
Background and Objectives:Phased-array intracardiac echocardiography (ICE) is a novel method for monitoringintracardiac procedures. We report our initial experience with ICE for guiding transcatheter device closure ofatrial septal defects (ASD). Subjects and Methods:From April 2004 to March 2005, ICE was performed in 27consecutive patients during percutaneous device closure of ASDs. The procedural feasibility, the procedure time,the fluoroscopic time, and the complication rate were compared with 27 prior cases that had utilized transesophagealechocardiography. Results:The procedure was performed successfully in all patients. The total procedure time(PT), device deployment time (DT), and fluoroscopic time (FT) were 65.7±22.3, 30.4±23.8, and 12.1±6.4minutes for the study group, and 73.6±23.7, 29.8±16.1, and 11.9±6.0 for the control group, respectively, withno significant difference between the groups. However, PT and DT were significantly shorter in the later 14 casesof the study group compared to the 13 initial cases (52.1±10.9 and 13.2±4.2 vs. 80.3±22.4 and 48.8±22.2, p<0.01, respectively). These differences were also significant compared to the control group, suggesting that there wasa learning curve for the procedure. Conclusion:ICE is a feasible and relatively safe method for monitoring andguiding percutaneous transcatheter closure of ASDs, but a learning period can be expected to achieve better proficiency.(Korean Circulation J 2006;36:612-616)