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愼學宰 木浦海洋大學校 1994 論文集 Vol.2 No.1
As a first step to study the low temperature flow properties of some residual fuels and to inuestigrte the measurement of the efficacy by flow improvers, a comparative test was conducted. From some experimental results, the following conclusions were obtained. ⑴ It is possible to estimate the CFPP as a testing method for gas oil diesel oil mixed with flow improvers. ⑵ In order to establish the CFPP as a formal testing method, many very strict restrictions must be obeyed for the accuracy of the measurement and some factors that affect to the low temperature flow properties of fuels. ⑶ As the flow improvershave the optimum mixing weight for improving the temperature flow properties sespectively, in case of comparing efficacies by them, it must be considered that.
愼學宰 木浦海洋大學校 1995 論文集 Vol.3 No.1
Generally speaking, the characteristics with heavy fuel operation is different from that with marine diesel oil in diesel engines and the fuel viscosity exerts a great influence on the injection characteristics. In order to design the injection system suitably, the influence of the fuel viscosity on the injection characteristics should be understood. In response, a series of experiments and simulation calculations have been carried out. As a result, it is obtained that the decrease of leakage from plunger clearance and the decrease of flow coefficient at nozzle hole excert on influence on the injection characteristics at incleasing fuel viscosity. Moreover, it could be said that the optimum viscosity at the inlet of injection pump is less than 15∼20 cSt in the range of conventional injection system.
중속 디젤 기관에 있어서 저질유 연소시의 排煙농도에 관한 고찰
신학재 木浦海洋大學校 1997 論文集 Vol.5 No.1
This paper describes for exhaust smoke study of degraded heavy fuel oil in medium speed diesel engine with high fuel injection pressure system. The combustion test has been carried out on heavy fuel oil. The smoke density of the degraded heavy fuel oil decreases with increasing the heat release rate at the initial region of the diffusion combustion. It is suggested that the smoke density measured under low load condition was related to the excess fuel in the fuel spray fraction impinging on the piston wall at the time of ignition which was estimated from the fuel spray penetration based on the momentum theory.
혼합형 교습전략을 기반으로 하는 지능형 코스웨어 저작 시스템
정정호(Choung-Ho Choung),신학재(Hak-Jai Sin),김민구(Min-Koo Kim) 한국정보과학회 1995 한국정보과학회 학술발표논문집 Vol.22 No.2A
상용되고 있는 대부분의 교육용 프로그램은 정해진 순서에 따라 교습이 진행된다. 이러한 교육용 프로그램은 주로 학습의 보조적인 수단으로 사용되고 있다. 교육용 프로그램이 학습의 주된 수단으로 사용되기 위해서는 개인교사와 같이 학습자의 상태에 따라 교습을 진행하여야 한다. 본 논문에서는 학습자의 상태에 따라 교습을 진행하는 교육용 프로그램을 제작할 수 있는 저작 시스템을 설계하였다. 설계한 저작 시스템에서는 정적인 교습순서와 동적인 교습순서를 기술할 수 있다. 정적인 교습순서란 대상이 되는 학습자들에 맞도록 미리 계획된 교습순서를 말하고, 동적인 교습순서란 개별 학습자의 상태에 따라 변화되는 교습순서를 말한다. 본 논문에서는 정적인 교습순서과 동적인 교습순서를 혼합하여 기술할 수 있는 저작 시스템 모델을 제시하였다.
김수용(S Y Kim),진소영(S Y Jin),정순희(S H Jung),유수영(S Y Yoo),강성준(S J Kang),신학재(H.J. Shin) 대한소화기학회 1987 대한소화기학회지 Vol.19 No.1
Ischemic colitis is frequently misdiagnosed as non-specific colitis, ulcerative colitis. The Surgeon may miss the true diagnosis at operation because arterial pulsations frequently are present in the mesenteric vessels, and the normal appearance of the serosa may mask the amount of ischemic damage in the bowel. Colonic ischemia is multifactorial disease complex, presenting as a continum that may range from mucosal edema to gangrene, from completly reversible to irreversible and from no vascular occlusion to complete occlusion. We had a case of ischemic colitis, associated with rectal cancer which was unexpected before operation. The literatures are reviewed here with the case presentation.