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I.H. Kim(김일한),S.W. Ha(하성환),C.I. park(박찬일),S.T. Kim(김수태) 대한방사선종양학회 1986 Radiation Oncology Journal Vol.4 No.1
1979년부터 1984년까지 이식신에 대하여 39회의 국소적 방사선조사가 서울대학교병원 치료방사선과에서 시행되었다. 10회는 예방적으로, 29회는 치료적으로 시행되었고 전체 환자 수는 29명이었다. 방사선조사는 1일 150cGy로 격일간 450cGy를 원칙으로 하였으며 methylprednisolone(Solumedrol)과 동시 병용되었다. 면역억제제로서 prednisone과 Imuran은 이식 후 계속 투여되었다. 방사선조사 시기는 예방목적일 경우에는 이식수술 후 1, 3, 5일에, 치료목적인 경우에는 거부반응의 진단 후 어느정도 시간간격을 두고 시행되었는데, 간격은 개인차이가 있었다. 10예의 예방적조사를 받은 이식신의 8예가 추후 거부반응이 출현하였으며, 이식 후 15개월 후에 기능적 생존을 보인 예는 없어서 예방적조사 효과는 회의적이었다. 치료목적으로 처음 조사받은 21예의 거부반응 회복율은 71%였고, 방사선조사 전 혈청 크레아티닌이 5.5mg%이하일 경우는 93%,; 5.5mg%이상일 경우는 17%였다(P<0.01). 극복이 안된 경우 재차 방사선조사에 대한 효과는 초회효과보다 열등하였다. 거부반응이 회복된 경우에 47%가 재차 거부반응이 출현하였다. 거부반응에 대한 처음 방사선조사 후 이식신의 기능적 생존율은 방사선조사 후 6개월, 1년, 2년 및 3년에 각각 70%,;65% 및 54%였고, 방사선조사 전 혈청 크레아티닌 수준, 거부반응 진단 후 방사선조사까지의 경과시간 및 방사선조사후의 반응 등이 이식신의 기능적 생존에 유의한 영향을 미침을 알 수 있었다(P<0.001). 따라서 방사선조사로 효과를 얻기 위하여는 거부반응으로 인한 이식신 파괴가 한계수준을 넘지 않는 범위 내에서 시행함이 필요함을 알 수 있었다. 이 효과는 Solumedrol과 병용된 결과이므로 방사선조사의 상대적 기여도를 밝히는 것은 어려웠다. From 1979 to 1984, 39 local allograft irradiations were given to 29 patients: 10 irradiations were administered for prevention and 29 for reversal of acute rejection of transplanted kidney. Three doses of 150 cGy every other day were combined with high-dose of methylprednisolone pulse (1 gm/day) for 3 days. For prevention of acute rejection, local irradiation was delivered on the days 1, 3, and 5 after the transplantation, and for reversal, irradiation started after the diagnosis of acute rejection. Eight out of 10 patients irradiated for prevention had acute allograft rejection, and, what is more, there was no surviving graft at 15 months after transplantation. Reversal of acute rejection was achieved in 71%. When the pre-irradiation level of serum creatinine was below 5.5mg%, the reversal rate was 93%, but above 5.5mg% the reversal rate was only 17% (p<0.01). Reirradiation after failure was not successful. Among 15 reversed patients, 7(47%) had subsequent rejection (s). The functional graft survivals at 6 month, 1, 2, and 3 year were 70%,;65%,; 54%,;and;54%, respectively. Therapeutic irradiation resulted in better graft survival when serum creatinine was below 5.5mg% (p<0.001) or when irradiation started within 15 days after the diagnosis of acute rejection (p<0.001).
실시간 ABS 시뮬레이션을 위한 차륜속도 시뮬레이터의 개발
김석민(S.M.Kim),배봉국(B.K.Bae),정재현(J.H.Chung),서명원(M.W.Suh),석창성(C.S.Seok),김영진(Y.J.Kim),이재천(J.C.Lee),김성봉(S.B.Kim),이선일(S.I.Lee),김장성(J.S.Kim) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_2
In order to perform a vehicle driving simulation test in laboratory for the electronic control unit(ECU) analysis of anti-lock brake system(ABS), it is necessary to simulate the wheel speed signal which is to be controlled for the various road and driving conditions. The speed signal from the real wheel speed sensor is not only for the speed calculation but also for the diagnosis of the ABS system. In this research, wheel speed simulator is developed which can generate the equivalent signal as that of a real wheel speed sensor. The applicability of the wheel speed simulator is validated by the simulation tests using commercial ECU of ABS. The wheel speed simulator is based on the personal computer so that it can be applied to other vehicle tests involving vehicle speed and/or wheel speed.<br/>
김석민(S.M.Kim),배봉국(B.K.Bae),정재현(J.H.Chung),서명원(M.W.Suh),석창성(C.S.Seok),김영진(Y.J.Kim),이재천(J.C.Lee),김성봉(S.B.Kim),이선일(S.I.Lee),김장성(J.S.kim) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_2
The prevalence of microprocessor-based controllers in automotive systems has greatly increased the need for tools which can be used to validate and test control systems over their full time range of operation. The objective of this paper is to develope the real time simulator of anti-lock braking system using hardware-in-the-loop simulationbased on a personal computer. By use of this simulator, the analyses of commercial electronic control unit as well as the validation of the developed control logics for ABS were performed successfully. The simulator of this research can be applied to development of more advanced control system, such as traction control cystem,vehicle dynamic control system and etc.<br/>
S.H. Ahn,홍병식,홍성종,M. Ito,T. I. Kang,B. I. Kim,J. H. Kim,H. W. Lee,K. B. Lee,이경세,J. K. Lim,D. H. Moon,박성근,W. J. Park,M. S. Ryu,H. H. Shim,심광숙,S. Y. Bahk,Y. J. Kim,김용은,D. G. Koo,S. J. Lee,S. K. Nam,J. T. 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1
We present the design and the test results for a real-sized prototype resistive plate chamber by using cosmic-ray muons for the forward region of the Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider (LHC). In particular, we investigate the effects of adding SF6 to the gas mixture for the avalanche mode operation of a resistive plate chamber. A small fraction of SF6 is very effective in suppressing streamer signals in a resistive plate chamber. The shapes of the muon detection efficiency and the muon cluster size remain similar, but are shifted to higher operating voltage by SF6. The noise cluster rate and size are not influenced by SF6.
1999년도 한국 신생아외과 현황 -대한소아외과학회 회원대상 전국조사(제 2 차)-
김우기,김상윤,김신곤,김인구,김재천,김현학,박귀원,박우현,송영택,오수명,유수영,이두선,이명덕,이성철,이석구,서정민,정상영,정성은,정을삼,정풍만,Kim, W.K.,Kim, S.Y.,Kim, S.K.,Kim, I.K.,Kim, J.C.,Kim, H.H.,Park, K.W.,Park, W.H.,Song, Y.T.,Oh, S.M.,Yoo, Y.S.,Lee, D.S 대한소아외과학회 2001 소아외과 Vol.7 No.1
To understand the current status of neonatal surgery in Korea, a survey was made among the 36 members of the Korean Association of Pediatric Surgeons. The response rate was 75 % (26 surgeons in 20 hospitals). Five hundred fifty three neonatal surgical patients treated in 1999 were analyzed. Regional numbers of patients were closely related to the regional population in most areas. Ano-rectal malformations (17 %), pyloric stenosis (16 %), Hirschsprung's disease (13 %), atresia/stenosis of the gut (11 %), esophageal atresia (8 %) were the most common anomalies treated. The majority of operations were done within the first week of life. Seventy one per cent of cases were major life threatening or so-called neonatal index cases. Over-all mortality was 8 per cent. Higher mortality was observed in patients with diaphragmatic hernia (26 %), gastro-intestinal perforation (18 %), NEC (18 %), and esophageal atresia(14 %). Higher mortality was observed in patients with extremely low birth weight (33%) and low birth weight (18 %). Associated anomalies were observed in 20 %. Prenatal ultrasound was performed in 36 per cent with sensitivity of 20 %. Result of this study was compared to the previous report (1994) and that of Japan (1998).
김완두(W. D. Kim),김완수(W. S. Kim),우창수(C. S. Woo),정승일(S. I. Jung),김석원(S. W. Kim),김영구(Y. G. Kim) 한국철도학회 2001 한국철도학회 학술발표대회논문집 Vol.- No.-
A chevron rubber spring is used in primary suspension system for rail vehicle. The chevron spring has function which support the load carried and reduce vibration and noise in operation of rail vehicle. The computer simulation using the non-linear finite element analysis program MARC executed to predict and evaluate the load capacity and stiffness for the chevron spring. The appropriate shape and material properties are proposed to adjust the required characteristics of chevron spring in the three modes of flexibility. Also, several samples of chevron spring are manufactured and experimented. It is shown that the predicted values agree well the results obtained from experiments.