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식도기관루를 동반한 선천성 식도폐쇄 -20년간 51례 치료경험-
한재현,정재희,송영택,Han, Jae-Hyun,Chung, Jae-Hee,Song, Young-Tack 대한소아외과학회 2008 소아외과 Vol.14 No.1
The aim of this study is to analyze the outcomes of the esophageal atresia with tracheoesophageal fistula over the last 2 decades. The records of 51 patients born between 1987 and 2006 were reviewed. Twenty-seven patients were male. Mean values of the age, gestational age and birth weight were 2.9 days, 296 days and 2.7kg, respectively. All patients had Gross type C anomalies. Thirty-one patients (60.7 %) had one or more associated congenital anomalies and the most common anomaly was cardiac malformation. In 48 cases, primary anastomosis was done and staged operation was done in one case. Circular myotomies in the proximal esophagus were performed in 9 cases. Postoperative complication developed in 26 cases (54 %): pulmonary complication in 12 cases, anastomotic leakage in 10 and anastomotic stricture in 10, recurrent trachoesophageal fistula in one and tracheomalasia in 2 cases. Reoperation was carried out in 2 patients with anastomotic leaks, the remaining leaks were managed non operatively. Three of the strictures were reoperated upon and the others were successfully managed by balloon dilatations. Overall mortality rate was 15.6 %. Mortality rate of the second 10 years (8 %) period decreased significantly compared to that of the first 10 years (23 %) period.
불확실한 수요와 리드타임을 갖는 공급사슬에서 (s,S) 재고정책에 관한 연구
한재현,정석재 대한안전경영과학회 2013 대한안전경영과학회지 Vol.15 No.1
As customers' demands for diversified small-quantity products have been increased, there have been great efforts for a firm to respond to customers' demands flexibly and minimize the cost of inventory at the same time. To achieve that goal, in SCM perspective, many firms have tried to control the inventory efficiently. We present an mathematical model to determine the near optimal (s, S) policy of the supply chain, composed of multi suppliers, a warehouse and multi retailers. (s, S) policy is to order the quantity up to target inventory level when inventory level falls below the reorder point. But it is difficult to analyze inventory level because it is varied with stochastic demand of customers. To reflect stochastic demand of customers in our model, we do the analyses in the following order. First, the analysis of inventory in retailers is done at the mathematical model that we present. Then, the analysis of demand pattern in a warehouse is performed as the inventory of a warehouse is much effected by retailers' order. After that, the analysis of inventory in a warehouse is followed. Finally, the integrated mathematical model is presented. It is not easy to get the solution of the mathematical model, because it includes many stochastic factors. Thus, we get the solutions after the stochastic demand is approximated, then they are verified by the simulations.
한재현,조계현,박종연 강원대학교 산업기술연구소 2003 産業技術硏究 Vol.23 No.A
This paper proposed methods of filament preheating to extend a fluorescent lamp life The ballast for the fluorescent lamp can be classified into two main groups magnetics and electronics. The electronic ballast is lighter and smaller than the magnetic ballast and it can dim up and down. There are two ways to start the fluorescent lamp in the electronic ballast: rapid start and instant start Also there are two methods of the driving inverter self excited oscillation and force excited oscillation. The rapid starting is different from the instant starting in that the rapid start is preheating the filament before the steady state If there is a preheating process before the lamp ignition. the life of the fluorescent lamp can be increased This paper presented the preheating methods for self excited oscillating system and force excited oscillating system.
한재현,최상민 대한기계학회 1989 대한기계학회논문집 Vol.13 No.4
본 연구에서는 미분탄의 연소과정을 파악하기 위하여 메탄-공기 예혼합 화염에서 연소중인 석탄입자를 단계별로 여러 위치에서 순간 냉각에 의해 채취한 후 단면을 관측함으로써 미분탄 연소과정의 해석을 시도하였다. 산소 함유량이 미분탄 연소에 미치는 영향을 고려하기 위하여 반응로에서의 연소 조건을 바꾸어 보았다. 또한 미분탄 연소과정의 이해를 돕기 위해 비분탄을 도가니에 넣어 전기 로에서 가열하여 얻은 챠르와 공기중에서 가열하여 얻은 회(ash)에 대한 단면을 관측하였다. 시험용 미분탄은 국내 발전소 등지에서 대량 소비되는 수입 유연탄을 사용하였다. An experimental investigation on the combustion behavior of pulverized coal particles was performed using the cross-section micrography techniques while sample coal particles were collected in-situ from the flow reactor. The coal particles were representative of pulverized bituminous coal undergoing a raped pyrolysis and combustion, however, quenched at the time when the particles were deposited onto a sample plate. The internal structure of coal was observed to change as deposited. Upon injection into a flow reactor, bituminous coal particles showed many holes which represented internal pore formation during the pyrolysis. The relative portion of the remaining matrix of coal was decreasing as the residence time progressed. This direct observation of cross-section of burning particles enabled better understanding of the coal combustion behavior.
한재현,김종명,유희정 대한소아청소년 정신의학회 2024 소아청소년정신의학 Vol.35 No.2
Objectives: The purpose of this study was to examine the patterns of use of oral aripiprazole treatment in children and adolescents diagnosed with autism spectrum disorder (ASD) at a university medical center in Korea. Methods: We retrospectively reviewed the medical records of 164 outpatient children and adolescents diagnosed with ASD by child and adolescent psychiatrists. Patient demographic characteristics, clinical features, age and dose of aripiprazole treatment, associated adverse events, and concomitant medications, etc. were evaluated. Results: Aripiprazole treatment was initiated at a mean age of 7.64 years, at a mean initial dose of 1.15 mg. Methylphenidate was often co-administered with aripiprazole. The most commonly reported adverse effects were increased appetite and weight gain, which in some cases led to discontinuation of medication. Conclusion: A follow-up study is warranted to evaluate the efficacy and safety of aripiprazole treatment in Korean children and adolescents diagnosed with ASD, and it is crucial to consider their clinical characteristics and response to treatment in the evaluation.