接觸共形曲率텐서場과 Laplace 演算의 Spectrum

권정환,김운택 대구대학교 부설 과학교육연구소 1991 과학교육 Vol.4 No.-

파라콰트 중독에서의 항산화치료

권운용,조유환,송형곤,김명천,이중의,서길준,윤여규 대한응급의학회 2001 대한응급의학회지 Vol.12 No.4

Background: Paraquat causes severe tissue toxicity when ingested, but has no effective treatment modality. We have shown that high dose vitamin C has effective antioxidant activities against the paraquat intoxication in a previous animal experiment. This study was designed to evaluate the effect of antioxidant therapy with high dose vitamin C and vitamin E in human cases of paraquat intoxication. Methods: From August 1999 to August 2001, 19 paraquat intoxication patients who visited the emergency department of the Seoul National University Hospital and the Kyounghee University Hospital were enrolled to this study. They were devided into two groups, a control group(9 patients) and a study group(10 patients). The control group received only conservative managements including gastro-intestinal decontaminati-on. The study group received conservative managements plus the antioxidant therapy which was composed of vitamin C 24 gm/day intravenously and 20 gm/day orally, and vitamin E 1.6 gm/day orally. Results: In the study group, 5 of 10 patients(50%) survived, but all patients of the control group died(p=0.003). There were no significant differences in age, sex, and usage of gastric lavage and activated charcoal between the two groups. Difference in ingested amount of paraquat between the two groups could not be analyzed due to the inexact and subjective measuring methods based on patients' histories. Conclusion: Antioxidant therapy with high dose vitamin C and vitamin E is effective in vival rate in paraquat intoxicated patients.

HFC-134a와 대체냉매 HFC-152a에 CF_3I를 혼합한 자동차냉매 특성

권일욱,박찬수,홍경한,문기선,최운수,서의경,윤갑식,이종인,하옥남 朝鮮大學校 機械技術硏究所 2002 機械技術硏究 Vol.5 No.1

These days, an attention of environment has been increasing all over the world. to prevent the green house effect and destruction of an ozone layer, an ozone destruction potential(ODP) be zero and a refrigerant for low global warming potential(GWP) is needed. HFC-134a, in which hydrogen is mixed instead of chlorine is a refrigerant used for automobile conditioners and its destruction potential is ecologically zero. However, it is not considered as a perfect substitutive refrigerant as its GWP is high. It is studied refrigerant mixtures in which HFC-134a, HFC-152a and CF_3I with low GWP and zero ODP are mixed by experimentally and concluded as follows; 1. with the variation of speed of compressor outside temperature and flow rate, the heat of evaporator and compressor and coefficient of performance was varied, and influenced the air conditioner. 2. The pressure of evaporator was decreased with increasing the speed of compressor and that of the refrigerant HFC-134a was higher 21% than that of azotrope refrigerant mixed with CF_3I. The overall capacity of condensor and evaporator was increased and HGC-134a was higher than azotrope refrigerant mixed with CF_3I 3. The capacity of evaporator with the refrigerant HFC-134a was higher 6% than azotrope refrigerant mixed with CF31 and the required power with zaotrope refrigerant mixed with CF_3I was higher 11% than that of HFC-134a. 4. The COP of the refrigerant FHC-134a was higher 31% in 1000RPM. when outside temperature was increased, COP was decreased. 5. Performance of HFC-134a is better than azotrope refrigerant mixed with CF_3I but prefered zaotrope refrigerant mixed with CF_3I considering the environment.

古代 로마人의 生活과 體育에 關한 硏究

권운택 한국체육대학교 부속 체육연구소 1985 체육연구소논문집 Vol.2 No.-

Observing the Roman sports and vital life, I found that those had been the internal changes and developments according to the flow of time. There were found the steps like these: 1.During the royal regime, the sports and vital life were under the control of the rulers and Etrurian. 2.During the early Republic control, the sports system was artless and natural but comparatively equal. 3.During the golden age of the Republic, the sports system was unequal, exclusive, and unnatural. 4.During the mid and late period of the Imperial Government, the sports system was different from that of Greece, showy game, and both extermities between the spectators and the athletes. 5.The whole atmosphere of the Roman "ludi" was similar to the modern Olympic and the late Greek Olympiad games.

차량 시뮬레이터를 이용한 적응순항제어시스템의 성능 평가

남형권,이운성 국민대학교 생산기술연구소 2003 공학기술논문집 Vol.26 No.-

Adaptive Cruise Control (ACC) system can automatically adjust the headway-time and driver vehicle's speed between a driver vehicle and a preceding vehicle. Driving simulator a is virtual reality tool that allows Driver-In-the-Loop Simulation in a laboratory. This paper addresses driving behavior with Adaptive Cruise Control (ACC) system using driving simulator. Participants with different driving styles have driven the simulator with and without ACC through a highway route. Participants are divided by Driving Style Questionnaire (DSQ)-Focus, Speed and Total DSQ scores. Driving behavior in terms of average headway-time, lateral position of a car, and head and gaze movement has been investigated.

조상들의 지혜와 느림의 철학을 배운 숲 탐방

조권운 숲과 문화 연구회 2002 숲과 문화 Vol.11 No.3

서울大學校學生의 赤血球沈降速度에 關한 硏究 : 結核集團檢診의 疫學的方法을 爲하야

金仁達,權彛赫,車喆煥,柳運相,尹德老,林道洙 서울대학교 1957 서울대학교 論文集 Vol.5 No.-

The Eryshrocyte Sedimentation Rate on the students of Seoul National Uuiversity was discussed corelating with X-ray findings for tuberculosis mass suruey. 1) Among the students of Seoul National University, 4727 were examined by miniature radiogram and the morbidity of active tuberculosis was shown 1.7 percent 616 of students were examined by both miniature radiogram and blood sedimentation reaction and the morbidity was 2.9 per cent. 2) The screening procedure by blood sedimentation reaction in addition to miniature radiogram could prevent missing around one fourth of active cases This means that E.S.R. has a great significance on the screening procedure for tuberculosis case findings. 3) Abnormal E.S.R. was shown on 75,5 percent of active cases. Persons whose E.S.R. are beyond 3mm for 30minutes and 10mm for 60minutes are suspected tuberculosis and should be required further examination. 4) The distribution rate of E.S.R. of between 0∼6.5mm was shown on 80percent of these students who were examined and that of between 0∼10mm was shown on 88.7 percent of students. The mean was 4.8mm. Hereby it is recommended That E.S.R. must be employed as one part of the useful methods on the mass screening survey for tuberculosis. furthermore it should be recalled that most of the Korean youths show tuberculin test positive. This fact requires such procedure as blood sedimentation reaction in addition to X-ray photography urgently on the epidemiological tuberculosis survey.

발열이 있는 호중구 감소증 환자에서의 위험도 예측인자

정중식,권운용,김규석,임용수,이중의,서길준,윤여규 대한응급의학회 2000 대한응급의학회지 Vol.11 No.3

Background: Most febrile neutropenic patients are treated in an aggressive manner. However, identification of low-risk patients may enable clinicians to administer risk-based treatment. The object of this study is to certify the factors associated with increased risk at the time of visiting the emergency department. Methods: This is a retrospective study. We reviewed the medical records of 101 febrile neutropenic patients who had visited the emergency department of Seoul National University Hospital from January 1998 to August 1999. We assumed 22 risk prediction factors that could be assessed at admission to the emergency department and 5 factors that could be assessed during treatment course. To find independent risk-prediction factors, we analyzed these factors respectively by using multiple regression analysis. Results: Tachycardia(aOR=136.5), altered mentality(aOR=28.8), decreased renal function(aOR=20.1), and significant comorbidity(aOR=17,2) are the independent factors associated with higher mortality. Altered mentality(aOR=31.6) and decreased renal function(CCr < 75㎖/min, aOR=5.4) are those associated with a higher incidence of septic shock. Independent factors associated with persistent(more than 3 days) fever are the early(within 10 days) onset of fever after last chemotherapy(aOR=8.8) and the existence of new pulmonary infiltrates on a simple chest X-ray(aOR=4.3). Conclusion: The stability of vital signs, the change of mentality, the renal function, the existence of significant comorbidity, the existence of new pulmonary infiltrates, and the rate of neutropenia are clinically useful risk-prediction factors in febrile neutropenia at the time of visiting the emergency department.

방광이행상피세포암에서 p53유전자의 변화

김법완,권태균,노기석,정성광,장세국,정운복,김정완 경북대학교 병원 1997 경북대학교병원의학연구소논문집 Vol.1 No.1

The objective of this study was to characterise the pattern of p53 mutations in bladder turmor. In this study, 25 bladder transitional cell carcinomas were analyed by immunohistochemistry (IHC) for p53 nuclear overexpression, and the results were compared with those of polymerase chain reaction-single strand conformational polymorphism (PCR-SSCP) analysis in exon 5-8 of the p53 gene and DNA sequencing analysis. 15 out of 20 cases (75%) showed p53 nuclear immunoreactivities on IHC. On PCR-SSCP analysis, 10 out of 25 cases(40%) had abnormal shifts on mobility. 62% of the mutations were in exon 8. Direct DNA sequencing analysis were performed in these 10 cases to confirm the presence of mutated p53 genes and to determine the type of mutations. Sixteen point mutations were detected in 10 cases. Tow specimens had double mutations and another two had triple mutations. G:C→A:T transitions were the most frequent patterns (62.5%). One mutation was a premature stop codon and two were silent mutations. There out of 10 had a point mutation at codon 285 (GAG/Glu→AAG/Lys) and two had at codon 280(GAG/Glu→AAG/Lys). One of 16 mutations was transition at hot spot codon 273 with CpG site. These results suggest that altered expressions and point mutations of p53 occured in all grade of bladder cancer, but are more associated with hight grade bladder tumors. To elucidate the carcinogenesis of bladder cancer, further studies should be carried out.

폐수 처리 장치에 대한 막분리 기술

유병승,한운우,유동권 大田大學校 産業技術硏究所 1994 산업기술연구소 論文集 Vol.1994 No.8