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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,오성원,정종진,김수연,이상민,조성언,선승호,황진우,백태현,Song, Chang-Hoon,Lee, Seul-Hee,Oh, Sung-Won,Jeong, Jong-Jin,Kim, Soo-Yeon,Lee, Sang-Min,Cho, Sung-Eun,Sun, Seung-Ho,Hwang, Jin-Woo,Baek, Tae-Hyun 대한한방내과학회 2007 大韓韓方內科學會誌 Vol.28 No.2
Objectives and Methods : Chronic pancreatitis is an inflammative disease characterized by both persistent and irreversible progression of pancreatic lesions that accompanies complications and pain which hinders everyday life activities. As the alcohol consuming population increases, chronic pancreatitis is increasing consequently. We retrospectively analyzed the medical record of a chronic pancreatitis patient who had been treated with oriental herbal medicine, acupuncture and moxibustion for 40 days. He complained of anorexia, fatigue, indigestion, weight loss, constipation, abdominal discomfort and pain. We prescribed him Daekumeumja, Bojungikgi-tang and other oriental herbal medicines in order to cure these symptoms. Results and Conclusion : For 40 days he was treated with oriental medicine and the symptoms mostly disappeared. When it comes to the therapeutic effects, it could be suggested that oriental medicine has significant effects on improving symptoms and qualities of lives.
동맥-정맥 우회술을 이용한 염소 태자의 태반 기능 보조법에 관한 연구
송창훈,이국현,박석천,소금영,김지애,장철호 대한마취과학회 2002 Korean Journal of Anesthesiology Vol.42 No.1
Background : The extrauterine fetal incubation system must meet stable blood gas exchange and sufficient oxygen supply to provide the physiologic oxygen consumption of the fetus. In the fetus, blood gas exchange is totally sustained by the placental circulation. The placenta can be regarded as an extracorporeal organ, and the basic structure of placental circulation comprises arteriovenous (AV) bypass. To mimic this mode of circulation, we used AV ECMO (extracorporeal membraned oxygenation) in the goat fetus, and attempted to achieve stable blood gas exchange and oxygen supply to the fetus. Methods : Pregnant goats, weighting 30-35 ㎏, were anesthetized with N_2O-O_2-enflurane. We performed a cesarean section with a midline incision, and cannulated via the umbilical vessels after a hysterotomy, and connected the fetuses to an ECMO circuit. The fetus was transferred to an incubator containing normal saline mixed with antibiotics. Blood samples were obtained every 4 to 6 hours from the circuit for electrolytes, hemoglobin and blood gas analysis and arterial blood pressure and heart rate were monitored through the umbilical artery. Oxygen delivery and consumption were calculated from the measured parameters. Microscopic examinations of the liver, kidney and lung were performed 24 hours after ECMO to know the effect of AV ECMO on the circulation of the organ. Results : AV ECMO was done for 24 hours in the six goat fetuses and the main cause of death was circulatory failure. Heart rates and blood pressure were stable during ECMO. Sodium bicarbonate was injected when mild acidosis occurred and blood gas exchange was maintained stable. Mean pump flow rate was 156 ± 62 ml/min/㎏ and oxygen extraction ratio was 30.4%. The liver function tests were sustained within normal limits both before and 24 hours after ECMO, but BUN and creatinin increased beyond upper normal limits 24 hours after ECMO. Microscopic features of the liver and kidney showed congestion 24 hours after ECMO. The fetal lung after 24 hours of ECMO especially showed an increase of mature capilllaries in the septum and wall of alveoli compared with the twin fetal lung. Conclusions : These results indicate that the extrauterine fetal incubation model used for this study was suitable to blood gas exchange and utility of oxygen for goat fetuses. (Korean J Anesthesiol 2002; 42: 95~106)