제 2형 콜라겐에 의해 경구관용 유도된 DBA/1 mice에서의 세포면역반응

양형인 ( Hyung In Yang ),김완욱 ( Wan Uk Kim ),민도준 ( Do Jun Min ),박성환 ( Sung Hwan Park ),홍연식 ( Yeon Sik Hong ),이상헌 ( Sang Heon Lee ),조철수 ( Chul Soo Cho ),김호연 ( Ho Youn Kim ) 대한류마티스학회 2000 대한류마티스학회지 Vol.7 No.4

Objective: To investigate the dosage of bovine type II collagen (BnCII) for the induction of oral tolerance in CIA animals, and to verify the changes of immune response and TGF-β production of mesenteric lymph node cells in tolerized CIA animals. Methods: Oral tolerance was induced by feeding of variable doses (5㎍, 10㎍, 20㎍ and 40㎍) of BnCII to DBA/1 mice 4 times per week during 2 weeks, and control mice were given ovalbumin (1000㎍), before immunization. We examed clinical assessment; incidence of arthritis, severity of arthritis, arthritic limb by visual analysis. IgG antibodies to BnCII were measured by ELISA, T cell responses to BnCII and PHA were quantified by antigen (CII)-induced 3H-thymidine incorporation into lymphocytes of mesenteric lymph node, draining lymph node, and spleen. TGF-β in supernatants obtained from lymph node culture medium was measured by ELISA. Results: Arthritis limbs were observed in 100% of control at 5 weeks after subcutaneous BnCII injection. The incidences of CIA in all tolerized group were significantly lower than that in control 5 weeks after immunization (control 100% vs. 5㎍ feeding group: 50%, 10㎍ feeding group: 50%, 20㎍ feeding group: 50%, 40㎍ feeding group: 55.5%, P<0.01). In comparison to control, mean articular indices were lower in all tolerized groups (control 5.13: 5㎍ feeding group 3.50, 10㎍ feeding group 2.75, 20㎍ feeding group 2.87, 40㎍ feeding group 2.63, P<0.05). Arthritic limbs were also significantly lower in tolerized groups (control 58.3: 5㎍ feeding group 20.8, 10㎍ feeding group 16.7, 20㎍ feeding group 20.8, 40㎍ feeding group 20.8, P<0.05). The titers of IgG antibody to CII were lower in tolerized group than that in control [tolerized group; median 10 (min. 0, max. 48), control; median 33 (min. 8.6, max. 101), P<0.05]. The proliferative responses to BnCII were significantly suppressed in tolerized (control 8010±2319cpm, tolerized group 4500±2060cpm, P<0.01). High TGF-β production was noted in tolerized group (control; 28pg/ml, BnCII feeding group; 73pg/ml). Conclusion: Oral tolerance in DBA/1 mice was successfully induced from low doses of BnCII (5㎍) and suppressed T and B cell function in conjunction with increased TGF-β production may play an important role for the induction of CII induced oral tolerance in DBA/1 mice.

개의 췌도분리에서 췌장의 팽창과 콜라겐 분해요소

이상훈,김성주,박정환,김종성,오승훈,한진수,정인경,양태영,김동준,김광원,이문규,민용기,이명식,정재훈,함종렬 대한당뇨병학회 2000 Diabetes and Metabolism Journal Vol.24 No.2

Backgrounds: One of the main problems conditioning the outcome of islet transplantation is the ability to separate a sufficient number of viable islets with preserved function. Islet purification is critically affected by all of the isolation stages. Thus, it is necessary to set up the standard isolation method that islets are separate well from acinar without compromising islet yield and viability. Methods: Twenty three adult mongrel dogs were used for the experiment of total pancreatectomy with islet isolation. The islets were properly isolated by a modified Recordi method. The obtained islets were further purified by centrifugation on discontinuous gradients using cell separation system (Model 2991, Cobe, Lakewood Colo). We evaluated islet number (islet equivalent number, 150 um equivalents/kg of recipient body weight, IEq/kg), purity, cell volume, viabilty, recovery rate, and comparison of outcome according to the isolation conditions. Results: 1) The mean of islet numbers before purification were 13543±9431Eq/kg, digestion times were 13.8±2.6 min., digestion temperature was 37.4±0.2℃, purity was 59.7?.0%, viability was 90.0±2.1%, cell volume was 4.7±1.1 mL, islet number after purification were 4064±361 IEq/kg, and recovery rate was 29±2.9%. 2) Isolated islet numbers were different according to the degree of pancreas distension with collagenase, digestion temperature, and digestion time. 3) The best conditions for islet isolation were above 37.5℃ in temperature at recirculation of collagenase, within 12 min in digestion time and well distended pancreas with collagenase. 4) According to multiple regression adjusted by variable factors, the degree of pancreas distension with collagenase and digestion time were independently associated factors for successful islet isolation. Conclusions: In this study, we concluded that the degree of pancreas distension with collagenase and digestion time were independent factors for successful islet isolation and the best conditions for islet isolation were above 37.5℃ in temperature at recirculation of collagenase, within 12 min in digestion time and well distended pancreas with collagenase.

구급일지를 통한 병원 전 환잔 분류 및 처치의 적절성 평가 연구

민순식,김재광,이근,박철완,양혁준,류일,현성열,이훈규,정환모,김윤 대한응급의학회 2000 대한응급의학회지 Vol.11 No.4

Background: Recently, patients' demands for emergency medicine are increasing, and most of prehospital medical care, including basic life support, cardiopulmonary resuscitation and triage, are provided by paramedics or emergency medical technicians. Evaluation of the adequacy of prehospital management and triage has become important for improving the quality and the effectiveness of the emergency medical system. Methods: The 202 patients who were transferred by ambulance with paramedics, nurses, or emergency medical technicians to the Emergency Department in Gil Medical Center from July 1, 1999, to September 31, 1999, were enrolled. This study was conducted prospectively by using the emergency physician,s log and newly devised protocols recorded by paramedics or nurses. Results: 1) Male to female ratio was 1: 0.8, and the peak age of the patients were the 4th(18.8%) and 6th decade(15.3%). 2) Of the 202 patients, 84 patients were transferred for trauma and 118 for medical problems. The mean transfer time was 6±1.73 minutes. 3) The validities of prehospital triage and decisions using the trauma severity measure and the disease severity measure, were 33.3% in trauma patients and 57.6% in medical patients.4) The results for the adequacy rate in prehospital management analyzed by using the rate of necessity of treatment. performance of treatment, and adequate treatment were as follows: oxygen supply.38.1/41.6/93.8 ; wound dressing. 19.3/71.8/92.9 ; immobilization of the cervical spine, 15.8/56.3/92.9 ; application of a spinal board. 12.9/42.3/72.7 ; application of a splint, 9.9/50.0/60.0 ; manual maintenance of an airway. 9.9/55.0/63.6 ; and CPR, 4.5/66.7/0. 5) Kind of ALS(Advanced Life Support) were not conducted(peripheral IV, EKG. intubation, medical administration. defibrillation, pacing). The rates of necessity of treatment were as follows: peripheral IV, 40.6%; ECG monitoring, 23.3% ; endotracheal intubation, 8.9% ; medical administration, 8.9% ; defibrillation. 3.5%; and pacing. 1.5% Conclusion: The adequacy of prehospital triage and decisions using trauma and disease severity measures was relatively low. To improve the adequacy of BLS(Basic Life Support) and to increase the performance of ALS(Advanced Life Support), we must create challenges to develop new protocols and to supplement new equipment.

Variation of Harbor Oscillations in Yeongil Bay

Min­Su Jeon,Joong­Woo Lee,Jae­Hyun Jeong,Sang­Yong Yang,Young­Hwan Jeong 한국항해항만학회 2006 한국항해항만학회 학술대회논문집 Vol.1 No.-

  Today, harbor oscillation problems are the most significant factor to consider when designing harbors serving very large ships. In coastal harbors, large vessels moored in the elastic hawsers are often displaced due to the resonance between long period waves and mooring systems. As a result, cargo handling may be interrupted and the hawsers may be broken, especially when the amplification becomes extreme. The most significant harbor confronted with harbor oscillation problem in Korea is Pohang New port. Many cases of problems are being reported by the pilot association and the local office of MOMAF (Ministry of Maritime Affairs and Fisheries). However, it is difficult to prevent the arrival of long waves causing oscillation within this harbor. Moreover, the Korean government has already started a new port plan at the mouth of Yeongil Bay without addressing the problems that have occurred in Pohang New port. This study deals with the variation of harbor oscillation due to the construction of a 4.1 km breakwater at the bay mouth including the arrangement of the new berths. Numerical methods used are in fairly standard form from the extended mile slope equation. The obtained numerical results were compared with field measurement from the previous and this will bring a certain level of discussion and consideration of variation to the future port development.

클러스터를 기반으로 한 인증 기법에 관한 연구

양환석,김종민,이웅기 朝鮮大學校 統計硏究所 2006 統計硏究所論文誌 Vol.8 No.1

본 논문에서는 ad hoc network에서 클러스터를 기반으로 노드들의 인증을 통한 안전한 데이터 전송 방법을 제안하였다. 클러스터를 관리하는 클러스터 헤드 노드는 클러스터가 형성될 때 멤버 노드들의 이웃 노드들에 대한 신뢰 정보를 받는다. 클러스터 헤드는 이러한 신뢰 정보와 자신의 정보를 조합하여 보다 정확하고 효율적으로 다른 노드를 평가한다. 이렇게 함으로써 네트워크에 새롭게 참여하는 노드에 대해서도 보다 정확한 인증을 수행할 수 있게 된다. 그리고 무선망의 제한된 대역폭을 고려하여 네트워크 상의 제어 패킷의 양을 줄여 데이터 전송의 효율성을 증가시키기 위해 제한된 broadcast 메커니즘을 이용하였다. 실험을 통해 제안한 방법의 효율성을 확인하기 위해 클러스터 헤드의 수, 경로 길이, 그리고 제어 패킷의 양을 측정하였다.

인터넷상에서의 최적 얼굴인식 시스템에 관한 연구

김종민,양환석,이웅기 朝鮮大學校 統計硏究所 2006 統計硏究所論文誌 Vol.8 No.1

본 논문은 다중 프레임(연속적 입력영상)을 이용한 실시간 얼굴인식 시스템에 관한 연구로써, 네트워크를 통한 얼굴인식 방법을 제안한다. 제안된 알고리즘은 우선 영상의 압축 및 축소 기법을 이용하여 전송 지연의 감소와 처리시간을 줄이고, 이에 따라 전체적인 인식 시간을 줄이는 것을 목표로 하고 있으며, 또한 여러 장의 입력영상을 이용하여 인식률을 높이는 방법을 제안하고자 한다. 그러나 단순히 기존의 방법인 point to point 방식인 단순 거리 계산은 오차가 많기 때문에 본 논문에서는 개선된 Class to Class방식인 Majority-Making-Decision rule을 이용하여 몇 개의 연속적인 입력영상을 모델영상의 인식의 단위로 이용하여 인식률을 높였다. 논문은 영상의 압축률과 크기에 따른 인식률의 상관관계를 바탕으로 전체적인 시스템 구현과 함께 알고리즘을 소개하는 것으로 구성되어 있으며, 실제 실험을 통한 성능을 비교 평가 하였다.

Haemophilus aphrophilus 심내막염 1예

차충환,신희봉,장성수,김민경,김양수,송재관,김미나 대한임상미샐물학회 2003 Annals of clinical microbiology Vol.6 No.2

정신분열증환자에서 Haloperidol과 Reduced Haloperidol 사이의 상호변환에 있어 Haloperidol Reductase에 관한 연구

김민정,정은기,오동열,김이영,양병환 大韓神經精神醫學會 1994 신경정신의학 Vol.33 No.5

Haloperidol is metabolized through reductation by the enzyme haloperidol reductase at the benzylic ketone to form an alcohol metabolite, known as reduced haloperidol. The basic and clinical pharmacology of reduced haloperidol and also haloperidol reductase is the main subject of haloperidol study, as the reduced metabolite can be converted back to the parent drug which has some neuroleptic effect. This study was undertaken to investigate correlations between haloperiol reductase activity in RBC and reduced haloperidol formation, also the difference of haloperidol reductase activity between responding and nonresponding schizophrenic patient. The results were as follows : 1) The haloperidol reductase activity of schizophrenic patients in RBC at 2 weeks was 12.8±4.3ng/30 min/200ul RBC, 16.0±11.9 at 4 weeks and 22.3±71 in control group. There was statistically significant difference of haloperidol reductase activity in RBC between schizophrenic patient and control group at 2 weeks but no difference at 4 weeks. 2) We divided the patient into responding and nonresponding group by the percentage of improvement in total BPRS score as more or less than 31% respectively and there was no significant difference of haloperidol reductase activity in RBC among two groups. 3)) There was no significant relationship between haloperidol dose of administration and haloperidol reductase activity in RBC. Considering the above results, haloperidol reductase activity in schizophrenic patients showed different results according to the duration of drug administration, so the study which deal with the factors, influencing the activity of haloperidol reductase, should be undertaken in the future.

손가락 끝 점을 이용한 손 형상 인식

김종민,이웅기,장근실,양환석,허진경,박승규 朝鮮大學校 統計硏究所 2007 統計硏究所論文誌 Vol.9 No.1

최근 사용자 친화형 유저 인터페이스 구현을 위해 인간의 손 형상을 실시간으로 인식하는 연구의 중요성이 부각되고 있다. 그러나 인간의 손은 자유도가 크기 때문에 손 형상을 정확히 인식하기란 매우 어렵고 또한 피부색과 유사한 색을 가지는 복잡한 배경에서는 더욱 곤란하다. 본 논문에서는 별도의 센서를 부착하지 않고 카메라를 사용하여 피부색 정보에 의한 손 형상을 분할한 후 손가락 끝 점을 찾는다. 찾은 손가락 끝 점을 이용하여 방향을 탐지하는 알고리즘에 대해 기술한다. 이 방법은 템플리트 매칭을 이용하여 손가락 끝 점을 탐색한 후 찾은 손가락 끝 점과 손목의 중심을 이용하여 전, 후, 좌, 우 방향을 탐지한다. 제안하는 방법을 이용하여 3D 가상현실 공간에서의 네비게이션(Navigation)에 응용하였으며, 실험결과 전진, 후진 및 좌측, 우측의 방향전환도 매우 좋은 결과를 보였다. 또한 본 논문에서 제안하는 방법은 마우스, 키보드, 조이스틱 등의 조작 없이 전, 후, 좌, 우 방향전환을 사용자가 직관적으로 지시함으로써 보다 자연스러운 인간과 컴퓨터의 상호작용을 제공할 수 있을 것이다.

Scintigraphy를 이용한 척수 손상 환자와 정상인의 담즙 배설양상 비교

신용일,양충용,주민철,위훈,정환정,김창근,길은영 圓光大學校 醫科學硏究所 2004 圓光醫科學 Vol.19 No.1