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최승원(Seung Won Choi),고윤석(Youn Suck Koh),주용선(Yong Sun Ju),최강현(Kang Hyeon Choe),김우성(Woo Sung Kim),김재중(Jae Joong Kim),박성욱(Seong Wook Park),박승정(Seung Jung Park),이종구(Jong Koo Lee),김원동(Won Dong Kim) 대한내과학회 1994 대한내과학회지 Vol.46 No.3
Objetive: The measurement of cardiac output by CO2 rebreathing method is noninvasive procedure using indirect Fick equation. In order to compare the result of cardiac output measured by CO2 rebreathing method with that by thermodilution technique, this study was performed. Methods: Simultaneous measurement of cardiac output by CO2 rebreathing method and thermodilution technique was performed in 13 mitral stenosis patients. The subjects were 4 men and 9 women, with mean age of 41.15±11.01 year. The cardiac output (CO) can be calculated from indirect Fick equation using the CO2 rebreathing method, CO=CO2 production/CvCO2-CaCO2. The CO2 production was obtained by collecting expired gas and multiply its volume by CO2 concentration and the arterial PCO2 was estimated from the end tidal PCO2. The mixed venous PCO2 was obtained from rebreathing plateau during O2 and mixture gas breathing through rebreathing bag. Results: 1) The average cardiac output was 3.41±0.45(L/min) by CO2 rebreathing method and 3.45±0.37(L/min) by thermodilution technique. 2) The result of cardiac output measured by CO2 rebreathing method was highly correlated to that by thermodilution technique (r=0.82). 3) The equation relating two measurements was Y =-0.01±0.99X. (Y: CO2 rebreathing method, X: thermodilution technique) Conclusion: This study showed that the result of cardiac output by CO2 rebreathing method was correlated well with that by standard thermodilution technique, so it is thought that CO2 rebreathing method could provide valid estimate of cardiac output for evaluation of cardiac function. It is simple to perform, easily repeatable and essentially risk free. Therefore this method could be very useful for clinical use.
직업성천식 감시체계에 등록된 우리나라의 직업성천식 실태
강성규(Seong Kyu Kang),지영구(Young Koo Jee),남동호(Dong Ho Nahm),민경업(Kyung Up Min),박중원(Jung Won Park),박해심(Hae Sim Park),손춘희(Seong Kyu Kang),조상헌(Sang Heon Cho),최인선(In Seon Choi),최승원(Seung Won Choi),홍천수(Chein S 대한천식알레르기학회 2000 천식 및 알레르기 Vol.20 No.6
Background: Since asthma caused by toluene diisocyanate (TDI) was reported at a polyurethane paint factory, occupational asthma there has been increasing concern of in both allergic and occupational health. However, the statistics of occupational asthma did not reflected its seriousness because of many barriers related to legal reporting. Since fild a voluntary report from a clinician sent directly to a surveillance center would allow more cases to be filed without any disadvantage to workers and employers, we developed a surveillance system to facilitate the reporting of occupational asthma. Methods : Allergists and pulmonary physicians were asked to report to the Occupational Asthma Surveillance Center(OASC) using a mail, fax or e-mail if work-related asthma was diagnosed. A claimed case for occupational asthma to the Occupational Health Research Institute was also included. The OASC contacted the workers by phone and investigated the workplace if necessary. The reported cases from October, 1998 to November, 1999 were analysed. Results: Thirty-three cases were reported with 29 males and four females. The mean age was 44 and the mean latency period was 5.4 years. Twenty-one cases were caused by a known allergen inducer with objective evidence. The causative agents included TDI in 45.5 %(15), followed by reactive dye in 24.2 %(8). welding fume(2), formaldehyde(1), paint (1), toluene(1). styrene(1), exhaustive gas(1), and wood dust(1). Among these cases, there were seven dyers, four painters, three machine operators and furniture finishers, two assemblers and tanneries. Eighteen cases had claimed Workers Compensation Insurance and all were accepted. The reasons for not claiming Insurance included ignorance(28.5%), feat of job dismissal (23.8%), other reasons (9.5 %), agreement with the employer(14.3%) and employer hirnself(9.5 %) Conclusion : The OASC by allergists was an effective system to find unreported cases and to provide a prevention strategy of occupational asthma. Occupational asthma was mostly caused by TDI and reactive dye. Painters and dyers were the most common occupations causing occupational asthma. Only half of occupational asthma patients claimed compensation because of workers ignorance and fear of being fired. (J Asthma Allergy Clin Immunol 20: 906-15, 2000)
시멘트 종류 및 압축강도 크기에 따른 콘크리트의 염분침투 및 탄산화 특성실험연구
오병환 ( Oh Byung Hwan ),최승원 ( Choi Seong Won ),정하태 ( Jung Ha Tae ) 한국구조물진단유지관리공학회 2005 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.9 No.1
Durability is a major concern in the design and construction of concrete structures which are located in the sea environment. In particular, the action of chlorides and carbonation may influence greatly the deterioration behavior of concrete structures. Therefore, the durability assessment of concrete structures is indispensible. The purpose of the present study is to evaluate the deterioration degree of concrete according to the lever of concrete strength and cement types. The test variables are concrete strength, types of cement, flyash contents, cover thickness of rebar. The effect of surface coating to prevent penetration is also studied. The test results indicate that the increase of strength decrease the chloride penetration and carbonation. The addition of fly ash also reduce the chloride penetration while the carbonation increase with addition of flyash.
시멘트 종류 및 압축강도 크기에 따른 콘크리트의 염분침투 및 탄산화 특성실험연구
오병환(Oh Byung Hwan),최승원(Choi Seong Won),정하태(Jung Ha Tae) 한국구조물진단유지관리학회 2005 한국구조물진단학회 학술발표회논문집 Vol.- No.-
Durability is a major concern in the design and construction of concrete structures which are located in the sea environment. In particular, the action of chlorides and carbonation may influence greatly the deterioration behavior of concrete structures. Therefore, the durability assessment of concrete structures is indispensible. The purpose of the present study is to evaluate the deterioration degree of concrete according to the lever of concrete strength and cement types. The test variables are concrete strength, types of cement, flyash contents, cover thickness of rebar. The effect of surface coating to prevent penetration is also studied. The test results indicate that the increase of strength decrease the chloride penetration and carbcnation. The addition of fly ash also reduce the chloride penetration, while the carbonation increase with addition of flyash.
AI 센서 솔루션을 활용한 원격 운전자 모니터링 시스템
우종혁(Jong-Hyuk Woo),최승원(Seung-Won Choi),서종모(Jong-Mo Seo),김성우(Seong-Woo Kim),안병은(Byung-Eun Ahn),이동주(Dong-Joo Lee),최연석(Yeon-Seok Choi),이인수(Insu Lee) 한국HCI학회 2019 한국HCI학회 학술대회 Vol.2019 No.2
운전자 상태 이상으로 발생하는 교통사고는 그 피해규모가 클 뿐만 아니라, 사고의 예측 및 대응이 불가능하며, 누구라도 사고의 피해자가 될 수 있다는 불안감때문에 사회적 문제로 인식되고 있다. 자동차 관련기술이 발전함에 따라 안전한 운행을 위한 보조장치들이 차량에 적용되고 있지만, 탑승하는 운전자안전을 모니터링하는 장치는 부족한 것이 현실이다. 본 연구는 이미지 센서를 기반으로 Remote PPG 기술과 AI 솔루션을 적용한 원격 운전자 모니터링 시스템을 제안하고자 하며, 연구 결과를 바탕으로 운행 중인 차량과 같이 급변하는 환경에서도 정확한 HR 측정결과를 제공하는 운전자 모니터링 장치 도입에 기여할 수 있을 것이다.
관절경을 이용한 고 빈도 재발성 전방 견관절 탈구의 재건술
고상훈,유총일,조성도,최창혁,전인호,우종근,곽창렬,윤동진,최승원,Ko, Sang-Hun,You, Chong-Il,Cho, Sung-Do,Choi, Chang-Hyuk,Cheon, In-Ho,Woo, Jong-Keun,Kwag, Chang-Yul,Yun, Dong-Jin,Choe, Seong-Won 대한관절경학회 2005 대한관절경학회지 Vol.9 No.2
목적: 수면중 탈구가 동반된 고 빈도를 보이는 재발성 견관절 전방 불안정성의 제한된 증례에서 관절경 술식을 이용한 하 견갑 상완 인대 전대의 축화 성형술과 전하 관절 낭-관절 순 복합체의 상방 전위와 더불어 보조적으로 시행된 후 하방 봉합 축화술, 열선 수축술, 회전간 폐쇄술의 단기 추시 결과와 효용성을 알아보고자 하였다. 재료 및 방법: 1998년 3월부터 2004년 2월까지 수면중 탈구가 동반된 고민도 재발성 탈구를 보인 드문 증례에 대하여 18예의 증례를 분석하였다. 평균 나이는 29.4$(21{\sim}37)$세 였으며, 평균 추시 기간은 22.1$(12{\sim}45)$개월이었다. 술전과 술후 6개월, 1년, 마지막 추시에서 운동 범위와 Rowe점수를 측정하였다. 결과: 우수 6예, 우량 10예로 우량 이상이 88.9%(16예)였으며 보통이 1예, 불량이 1예였다. 결론: 수면중 탈구를 동반한 고 빈도 탈구를 보이는 재발성 전방 견관절 불안정성에서 관절경 하 재건술은 좋은 결과를 보여 관혈적 술식의 대체 방법이 될 수 있지만, 더 많은 증례에 대한 장기 추시가 필요할 것으로 사료된다. Purpose: To evaluate the short-term follow up outcome and the effectiveness of arthroscopic vertical shift of anteroinferior capsulolabral complex, plication of AIGHLC (anterior band of inferior glenohumeral ligament complex) and thermal capulorraphy, posteroinferior suture plication, rotator interval closure as an adjuncts in recurrent instability of megafrequency with night time dislocation. Materials & Methods: From March 1998 to February 2004, we have had 18 shoulders out of 156. All of the cases have been night time dislocation above more one time. The age were average 29.4$(21{\sim}37)$ year old. The average follow up were 21.1 $(12{\sim}45)$months We checked Rowe score and ROM at pre-operation, post-operation 6 months,1 year & last follow up period. Results: Above good results were 16 cases(88.9%). The excellent were 6 cases, good were 10, fair 1, poor 1. Conclusions: In recurrent anterior shoulder dislocation in greater than 50 frequency, arthroscopic stabilization can be an alternative technique for selected patients against open inferior capsular shift. But more long ter n follow up and large materials will be needed in the future study.