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[論文] 4사이클 4氣筒 電氣點火機關의 吸排氣管內의 壓力變動에 關한 硏究
이석재(Seog Jae Lee),김응서(Eung Seo Kim) 한국자동차공학회 1988 오토저널 Vol.10 No.6
The purpose of this study is to investigate the flow through the intake and exhaust system of a spark ignition engine. The flow was assumed to be one-dimensional, compressible and unsteady, and carburetor, muffler, valve and junction are modelled as boundary conditions accord-ing to their flow characteristics.<br/> In the experiment, four cylinder gasoline engine is used and the pressures in the intake and exhaust pipes and in the cylinder are measured and compared with the results of numerical analysis.<br/> In consequence of the comparison, four periods of pressure wave in a cycle are observed in both case of experiment and prediction. In case of exhaust pipe, the results obtained from the experiment are in accord with that from calculation. The results of the intake system show some differences with each other due to the complication in shape, but the periods of both case concur well.
하경표(Kyoung-Pyo Ha),이석재(Seog Jae Lee),김우태(Woo Tae Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Friction reduction is one of the most important factors to improve fuel economy of an engine. Present investigation of an engine’s friction is based on the strip-down method, and present study improved the method to break-down engine’s friction into more components. This was done by cam torquemeter developed by the authors and the torquemeter can separate chain friction from cam shaft friction. Several factors influencing chain guide friction were tested and three major factors were chosen to reduce chain friction by 48%; these factors include chain tensioner spring, oil pressure and chain layout. Fuel economy was measured to increase by 0.8% with the chain friction factors at 2,000 rpm and BMEP 2.0 bar condition. Friction factors of cam shaft, crank shaft and oil pump were also discussed.
신명수,윤병민,송정국,이석재,박상현,정연우,Shin, Myung Soo,Yun, Byung-Min,Song, Jung Kook,Lee, Seog Jae,Park, Sang Hyun,Jeong, Yeon Woo 제주대학교 의과학연구소 2018 The Journal of Medicine and Life Science Vol.15 No.2
The reconstruction method of nasal area can be used differently depending on the location, size, age. In this elderly female patient case, without using the forehead medial flap, good results can be obtained by using an advancement flap considering the nasal aesthetic unit.
李碩宰,李康民 全北大學校 1996 論文集 Vol.42 No.-
Enzyme reaction is a highly specific reaction in nature. The use of enzymes in nonaqueous mixture could open a new possibility of application in biocatalysis of low water soluble substrate and in synthesis reaction. The frequently investigated systems of non aqueous systems are two phase, reversed micelle, soled enzyme in organic solution. There is no systematic comparison of these respective performances of these different enzyme reactions. We will study cholesterol oxidase as a good model in this systematic studies.
심장 수술 중 발견된 양측성 폐 분리증 : Incidentally Found during Open Heart Surgery
이석재 충북대학교 의과대학 충북대학교 의학연구소 2003 忠北醫大學術誌 Vol.13 No.2
폐분리증이 특이한 질환이라 볼 수는 없으나 양측성으로 발견되는 폐분리증은 국내 뿐 아니라 세계적으로도 그 발표 례가 많지 않은 실정이다. 특히 폐분리증은 그 자체에 의한 증상들, 즉 폐렴이나 주변 장기의 압박에 의한 증상들에 의해 발견되는 경우가 대부분이며 심장수술중 발견된 예는 보고된 바 없다. Pulmonary sequestration is not a rare disease entity. But the bilateral pulmonary sequestration is a very rare disease. Especially, it is very hard to find the pulmonary sequestration, if there wre no clinical symptoms or signs. I describe a rare case of bilateral pulmonary sequestration without related symptoms which has been recognized during open heart surgery.
관동맥 질환 환자에서 전산화단층촬영상의 복부지방 분포 및 형광안저 촬영
한혜자,홍종면,차상훈,김동운,남기병,최미영,강세웅,박남규,이석재 충북대학교 의과대학 충북대학교 의학연구소 1996 忠北醫大學術誌 Vol.6 No.2
배경 및 목적 : 죽상경화증의 원인 인자중 하나인 복부지방의 축적도를 복부 전산화 단층 촬영술로 정량화 하여 관동맥 질환과의 상관 관계를 살펴보고자 하려고, 또한 형광 안저 촬영 검사상의 죽상 경화증 정도와 관동맥 질환과의 상관 관계를 알아보고자 하였다 대상 및 방법 : 관동맥 조영술을 시행한 환자중 관동맥조영술 소견상 50% 이상의 협착이 있는 경우를 관동맥 질환군(n=15)으로 정의하였고, 관동맥 조영술 소견상 관동맥 질환이 없고 허혈성 뇌혈관질환, 당뇨병 및 고혈압이 없는 환자들을 대조군(n=11)으로 하였다. 배꼽 위치에서 복부 전산화 단층 촬영을 시행하여 총 복부 지방면적(total abdomen fat area, TAFA). 복강내 지방면적(abdomen visceral fat area, AVFA) 및 복부 피하지방면적(abdomen subcutaneous fat area, ASFA)을 측정하였고, 그 비를 구하여 비교 분석하였다 또한 형광 안저 촬영 검사를 시행하여 동-정맥비와 동-정맥교차수 및 팔망막 순환기 시간을 측정하여 비교 분석하였다. 결과 : 1) 복부 전산화 단층 촬영 : 대조군과 관동맥 질환군은 복강내 지방면적/(AVFA/TAFA)은 각각 53.9±8.3, 56.1±8.5으로 통계적으로 유의한 차이가 없었고, 또 복강내 지방면적/복부 피하지방면적(AVFA/ASFA)도 각각 0.90±0.30, 0.82±0.26으로 통계적으로 유의한 차이가 없었다 (p>0.05). 2) 형광안저 촬영 검사 ; 대조군과 관동맥 질환군에서 동-전맥비(%)는 각각 72.1±4.9, 62.5±6.1, 동-정맥 교차수는 0.3±0.5, 1.1±1.1, 팔망막 순환기 시간(msec)은 15.3±1.8, 17.8±4.0으로 세 지표 모두에서 통계적으로 유의한 차이가 있었다 (p<0.05). 결론 : 관동맥 질환 환자에서 전산화 단층촬영을 이용하여 구한 복부지방의 분포양상(복강내 지방의 구성 비율 등)은 정상 대조군과 차이가 없었다. 관동맥 질환 환자와 정상 대조군에서 형광 안저 촬영 검사로 측정한 동정맥 직경비, 동정맥교차현상수 및 팔망막순환시간은 각각 통계적으로 의미 있는 차이가 있었다 Background : We quantitatively evaluated the abdominal fat distribution by computed tomography(CT) in coronary artery disease patients and the findings of fluorescence angiography in coronary artery disease patients. Methods: Among the patients who were done coronary angiography(CAG), the control group(n=11) has no angiographically significant stenosis(<50%) and the coronary artery disease(CAD) group(n=15) has more than one significant stenosis(>52%). We examined abdominal CT at umbilicus level and fluorescence angiography in all patients. In abdominal CT, we calculated total abdominal fat area(TAFA), abdominal visceral fat asea(AVFA) and abdominal subcutaneous fat area(ASFA) and their ratios. In fluorescence angiography, we calculated that artery-vein ratio(AV ratio), artery-vein cross number(AV cross No) and antecubital-retinal circulation time. Results: 1) Abdominal CT A. AVFA/TAFA(㎡) ; Control group : CAD group = 53.9±8.3 : 56.1±8.5 (p〉0.05) B. AVFA/ASFA(㎡) ; Control group : CAD group = 0.90±0.30 : 0.82±0.26 (p〉0.05) 2) Fluorescence angiography A. AV ratio(%) ; Control group : CAD group = 72.1±4.9 : 62.5±6.1 (p〈0.05) B. AV cross No ; Control group : CAD group = 0.3±0.5 : 1.1±1.1 (p〈0.05) C. Antecubital - retinal circulation time(ms) Control group : CAD group = 15.3±1.8 : 17.8±4.0 (p<0.05) Conclusion : There was significant association between the FAG findings and CAG findings but there was no significant association between the abdominal fat distribution by abdominal CT and CAG findings.
이석재,박동식 圓光大學校 醫科學硏究所 1994 圓光醫科學 Vol.10 No.1-2
A study on spinal cord injury patients with neurogenic bladder dysfunction using sterile intermittent catheterization was conducted. The purpose of this study was to evaluate the effect of bladder training in neurogenic bladder patients for genitourinary complication, and to achieve balanced bladder. The subjects were 19 spinal cord injury patients with neurogenic bladder dysfunction who were admitted to the Department of Rehabilitation Medicine of Wonkwang University Hospital from March 1994 to August 1994. The results were as follows: 1) Among the 19 patients ranging in age from 19 to 60 years old, the most common age group was 30-39 years old, and the subjects conisisted of 15 male and 4 female patients. 2) Of 15 patients with spinal cord injury on and above T10. 12 patients had detrusor hyperreflexia. Whereas areflexia in spinal cord injury below T10 was found in 3 out of 4 patients. 3) Balanced bladder was achieved in 18 out of 19 patients, and the duration of intermittent catheterization was 47 days in the complete injury patients and 15 days in the incomplete injury patients. 4) Providencia rettgeri was the most common causative organism of urinary tract infection. 5) The prevalence of symptomatic urinary tract infection was 42.1% in 19 patients. 6) The urologic complication caused by neurogenic bladder in spinal cord injury patients was found in 2 out of 19 patients( 10.5%).