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Analysis and measurement of relative humidity effects on ejector performance
이호채,제갈승,송성진 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.9
Pumping in ejectors is a measure of how much the secondary fluid is entrained by the high momentum primary flow and is one of the crucial performance indices. In the fuel recirculation system of fuel cells, the entrained secondary fluid contains water vapor due to the over-supplied hydrogen, making the secondary fluid humid. In such cases, the relative humidity of the secondary fluid alters the fluid properties of the mixed flow. This study examines such effects of relative humidity on ejector. A new analytical model has been developed, and series of measurements has been conducted to validate the model’s prediction. The present results demonstrate that higher relative humidity of the secondary fluid reduces pumping in an ejector. During the mixing process of the two fluids, condensation releases heat, increasing the ejector operating temperature. Thus, secondary flow density is decreased, and pumping is lowered.
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1㎾ Class Micro Turbine Development
이호채(Hochae Lee),송성진(Seung Jin Song) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
This paper presents a development of 1㎾ class micro turbine for micro power system. The turbine is a single-stage radial inflow turbine with a rotor diameter of 25㎜ with 11 blades. Its design pressure ratio is 2.5 with TIT of l000K. Using Concepts NREC Axcent. aerodynamic design and CFD analysis of micro turbine was accomplished. Designed turbine is expected to exert 3㎾ of work at design speed of 350.000 rpm with 65% total-to-static efficiency. Rotor of micro turbine was machined using 5-axis machining tool. Its material is stainless steel. SLS (Selective Laser Sintering) technology was used to fabricate for stationary components including nozzle and volute. The micro turbine will be cold tested with compressed air. With coupled high speed generator, it is expected to generate up to 1.7㎾ of electrical power at speed of 180,000 rpm.
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난치성 복수에 대한 복수 초여과 및 복강내 재주입법의 장기 치료효과
이호채,기춘석 한양대학교 의과대학 1990 한양의대 학술지 Vol.10 No.1
Management of ascites, which is caused by liver cirrhosis or other hepatic disease, can be very difficult if it is refractory to drug therapy. Diuretics, even when effective, may cause metabolic or ionic derangements. Repeated abodominal paracentesis may result in hypotension, renal functional impairement and loss of albumin. LeVeen shunt, a devise to drain ascitic fluid into vein, has its lmited use because of some serious complications, such as pulmonary edema, heart failure, gastrointestinal bleeding and DIC. Alternatively there have been trials in which tapped ascitic fluids were ultrafiltered and the unfiltered proteins were retruned back into the peritoneal cavity. These studies however were conducted withsmall number of cases in short term periods. Therefore the present study was designed to evaluate the longterm therapeutic effect of ascitic ultrafiltration and peritoneal reinfusin on 392 patients with 912 procedures for about 9 years. Ascitic fluid was tapped through 15 gauge needle and was continuously led to an artificial hollowfiber kidney with cuprophan semipermeable membrane and ultrafiltered by a blood pump. The unfiltered macro-molecular solution containing most of the proteins was returned back into the peritoneal cavity through another 15 gauge needle. Nine hundred and twelve procedures were performed on 392 patients during the period of 9 years. The results were as followings; 1) Approximately 5300cc of ascites was ultrafiltered for an average of 3.85 hours. 2) There were no significant changes in blood pressure and heart rate before, during and after the procedures. 3) There were no significant changes in creatinine clearance and serum electrolytes before and after the procedures. 4) Serum albumin level increased from mean value of 2.51±0.5 gm/dl to 3.06±0.52gm/dl on the 3rd day after ultrafiltration (P<0.01). 5) The mean interval of ultrafiltration required in patients with liver cirrhosis was 28.0 days and n malignant ascites, 18.7 days, respectively. 6) Compared with 30 cirrhotic patients treated conventionally, 52 similar patients treated with intermit ultrafiltration lived longer, 5.1±3.2 v.s 11.2±.5 months, p<0.05. 7) There was minor complication such as abdominal pain, muscle cramping, dizziness, chest tightness and ascites leakage, but serious complications were not observed. In conclusion, ascitic ultrafiltration and peritoneal reinfusion is thought to be an effective method in controlling refractory ascites and reducing morbidity and mortality of cirrhotic patients.
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채종주,박용선,조소현,강석용,이호,김홍범 해양환경안전학회 2019 海洋環境安全學會誌 Vol.25 No.4
Maritime accidents are always accompanied by human/property damages. If management level ship's officers properly respond to emergency situation in a correct manner based on knowledge required by international conventions, when maritime accidents occur, it will be possible to minimize such human/property damages. To improve the ability to deal with maritime accidents, this study analyze maritime accident cases to identify which competencies ships' officers' were lacking, compared the emergency response competencies required by international conventions, analyzed various emergency management manuals of shipping companies and carried out questionnaire surveys to suggest improvements of emergency response capability for ship's master. Through the analysis of maritime accidents, it was identified that management level ship's officers lacked competencies regarding damage stability and intact stability, and that the training for emergency response required by international conventions had been insufficiently carried out. In addition, even though emergency management manuals of ships were generally adequate, it has been identified that there were limitations in terms of practical use of emergency response manual. Therefore, based on the questionnaire, this study proposed the expansion of emergency response training required by international conventions based on use of simulators, and the development of guidelines or manuals for effective and efficient response in emergency situations. 해양사고는 항상 인적/물적 피해를 동반한다. 이러한 해양사고가 발생하였을 때 선박의 관리급 해기사가 정확한 지식을 바탕으로 비상 상황에 적절히 대응 한다면 이러한 인적/물적 피해는 최소화 할 수 있을 것이다. 본 연구에서는 해양사고 사례분석을 바탕으로 해양사고 발생 시 부족했던 해기능력 식별, 국제협약에서 요구하는 비상대응 능력을 비교, 선사가 보유하고 있는 다양한 비상대응 매뉴얼 분석 및 설문을 통해 해기사의 비상대응능력 향상을 위한 개선 사항을 제안하였다. 주요 해양사고사례를 통해서 많은 관리급 항해사가 손상복원력, 비손상복원력에 대한 지식의 부재를 식별하였고, 국제협약에서 요구하는 비상대응 해기능력의 경우 일부 축소해서 제공되고 있다는 것을 확인할 수 있었다. 더불어 선사의 비상대응 매뉴얼은 대체로 잘 갖추어져 있으나 실제 비상시 활용 측면에서는 한계가 있다는 것을 식별하였다. 이러한 분석을 바탕으로 선원 및 선사 관계자를 대상으로 설문을 시행하여 국제협약에서 요구하는 비상대응 해기교육의 확대, 시뮬레이터를 활용한 비상상황에 대한 간접경험 기회제공 확대 및 비상 시 효과적이고 효율적인 대응을 위한 지침 또는 매뉴얼의 개발 등을 제안하였다.
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국내에서 분리된 일본뇌염 바이러스의 Envelope Protein의 3차구조 분석
남재환,채수림,김은정,윤경식,이호동,고현철,조해월 대한바이러스학회 1997 Journal of Bacteriology and Virology Vol.27 No.2
Three dimensional structures of envelope protein from Korean isolates and Nakayama-NIH strain of Japanese encephalitis virus (JEV) were deduced by a computer program (HyperChem 4.0 Chemplus 1.0) based on the data of the three dimentional structure of Tick-borne encephalitis virus. In the three dimensional structure of envelope protein, neutralizing epitope and T-helper cell recognition site of C-terminal region of Korean isolates were structually similar to those of Nakayama-NIH but the N-terminal region was not. Korean JE isolates were compared with Nakayama-NIH strain by using cross-neutralization antibody test. Neutralizing activities of Korean isolates derived from guinea pigs were higher than those of Nakayama-NIH strain against Korean isolates, although the polyclonal antibody titers of Nakayama-NIH showed 1:160 to 1:640 against Korean isolates. According to the results from three dimentional structures and cross-neutralization analyses, the antigenic difference between Korean JE isolates and Nakayama- NIH strain may be dependent on structural difference of envelope protein.
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