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A Two-Stage Scenario-Based Stochastic Programming Approach To Pre-Positioning Emergency Supplies
송창훈,박석봉 육군사관학교 화랑대연구소 2012 한국군사학논집 Vol.68 No.2
A two-stage stochastic programming model with recourse for pre-positioning hurricane supples is presented in this paper. Companies face the difficult decision of where to strategically preposition emergency supplies in preparation for a variety of possible disasters. Uncertainty caused by factors, such as the path of a hurricane, is a major influence on demand for emergency supplies. The first stage of the model relates to finding th optimal allocation of supplies from one warehouse to a variety of geographically dispersed locations that will potentially be affected by an observed storm. The second stage (or recourse) problem is concerned with deriving the re-allocation of supplies among the locations once demands have been realized after the storm has passed. The result of the study provides a means for determining what inventory levels should be stocked at each location, and how re-distribution strategies should be carried out. Also, the result of the study indicates that the expected cost of the pre-positioning strategy is lower that the expected costs without a pre-positioning strategy.
송창훈,이슬희,김정철,오성원,정종진,황진우,백태현,Song, Chang-Hoon,Lee, Seul-Hee,Kim, Jung-Chul,Oh, Sung-Won,Jeong, Jong-Jin,Hwang, Jin-Woo,Baek, Tae-Hyun 대한한방내과학회 2006 大韓韓方內科學會誌 Vol.27 No.3
Objectives : This study was designed to evaluate the effects of oriental treatment on cancer patients. Methods : We retrospectively analyzed the medical record of a distal cholangiocarcinoma patient who had been treated with oriental medicine for 150 days. He complained of anorexia, dyspepsia, fatigue, weight loss, constipation, abdominal discomfort and pain. etc. We prescribed him Samchulkunbi-tang and other oriental medicines, in order to treat symptoms and improve long term survival. Results and Conclusion : For 150 days, he was treated with oriental medicine and the symptoms mostly disappeared. We had a worthwhile improvement of long term survival. When it comes to therapeutic effects, it could be suggested that oriental medicine has significant effects on improving symptoms, survival and quality of lifes.
소형디젤엔진용 E-EGR 밸브의 개발 및 차량적용에 관한 실험적 연구
송창훈,정용일,차경옥 한국에너지학회 2002 에너지공학 Vol.11 No.3
본 연구에서는 유니크에서 개발된 E-EGR 밸브의 특성을 분석하였으며, 차량적용의 가능성을 평가하였다. 메르세데스 벤츠에서 개발된 배기량 0.8리터급 소형디젤 승용차인 Smart cat가 본 실험에 사용되어졌다. 실험용 차량은 전자식 EGR 밸브가 장착된 3기통의 터보 과급식 차량이다. 테스트벤치에서 EGR 밸브의 성능을 비교 및 분석한 후 차대동력계상에서 EGR map과 CVS-75 시험결과를 통하여 전자식 EGR 밸브의 차량적용 가능성을 여부를 수행하였다. In this study the characteristics of E-EGR valve developed by Unick were analyzed and the feasibility of application to vehicles were evaluated. Smart car (3$\ell$/100 km) and engine which is small-displacement size, 0.8-liter, of diesel passenger car developed from Mercedes-Benz were used for this experiment. It was installed a 3-cylinder turbo-charged light duty diesel engine with an electronic EGR valve. After the analysis and comparison of E-EGR valve performance under test benches, the estimation of vehicle application was executed through the EGR map and CVS-75 test result measured on the chassis dynamometer.
의과대학 산과학 강의에 있어서 주제발표식 학습에 시도와 문제점 분석
송창훈 朝鮮大學校 附設 醫學硏究所 1998 The Medical Journal of Chosun University Vol.23 No.1
Traditionally, medical education was performed by professor-centered lectures However, medical education is changing rapidly from traditional concepts to new trends. One of the changes is problem based learning. The purpose of this study is to model the modified PBL which is adjusted in our educational environment. A class of 165 students at Chosun U-niversity Medical School. was selected as a study group from August 1997 to October 1997. The lecture was performed by the students themselves every week according to lecture topics given from the tutor. The results were as follows: 1.The students' own opinions about ; ubject-Oriented Student Lecture(SOSL) were mainly(78%) that it was worthy of development with repletion. 2. The students who wanted to partici late in a lecture were 58.8%, and the students who didn't want were 38%. 3. The disadvantages of SOSL, which were indicated by students, were disorganized and disarranged lectures(31.9%), unclear lectures(30%), lack of reliability (19.4%), and partial participation(18.8%). 4. The students who participated in SOSL needed additional professor's supplementary lecture(54.3%), whole participation (48.9%), presentation skills (40%), programming (24%). preparation (17%). 5. The students had difficulty in group study (60%), subject understanding (446%). reference survey(31%),and lack of time(26%). 6. The educational patterns of Chosun Medical School were professors-entered with lecture notes (79.4%). 7. The students that wanted changes from the previous teaching methods were 96.9% and those that did not want changes were 3.1%. In conclusion, SOSL may cause some confusion and dissatisfactions to students who are familiar with traditional professors-entered lectures, but by revolution and development. SOSL will be applicated as an effective instruction in our actual circumstances.
4행정 가솔린기관의 상용배기시스템 소음저감 및 성능에 관한 실험적연구
송창훈,양진승,차경옥 명지대학교 산업기술연구소 2001 産業技術硏究所論文集 Vol.20 No.-
In vehicle exhaust systems the sound attenuation and the reduction of flow losses are often two competing demands. The present study considers a fully vehicle exhaust system and investigates experimentally both the sound attenuation and the flow performance of production configurations including the catalyst, the resonator, and the muffler. Dynamometer experiments have been conducted with 1500cc engine with speeds ranging from 1000 to 5000 rpm. Measurements include the flow rates, the temperatures and the absolute dynamic pressures of the hot exhaust gases at point locations. The present study describes the experimental aspects of an ongoing effort to validate and use the nonlinear fluid dynamic models in the time-domain for the prediction of the acoustic and power performance of firing internal combustion engines with full production exhaust systems.