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강용 ( Yong Kang ),김진길 ( Jin Kil Kim ),이상문 ( Sang Moon Lee ),홍성창 ( Sung Chang Hong ),이의동 ( Eui Dong Lee ) 한국화학공학회 2013 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.51 No.1
Characteristics of photocatalytic CO removal process conducting CO conversion by using Pt loaded TiO_2 photocatalyst were investigated in a photocatalytic tubular reactor. Effects of Pt loading method onto TiO_2, linear velocity of gas stream containing CO gas, CO concentration and moisture content in the gas stream on the conversion of CO to CO_2 were examined. It was found that the CO gas could be removed almost 100% by using photocatalytic tubular reactor internally coated with Pt/TiO_2 photocatalyst under UV irradiation, when the linear velocity of gas stream was in the range of 0.01~0.25 m/s and CO concentration in the gas stream was ranged from 20 to 100 ppm and the relative humidity of the gas stream was in the range of 20~40%. The conversion of CO gas decreased gradually with increasing linear velocity of gas stream and CO concentration in the gas stream. The moisture in the gas stream could promote the removal of CO gas by means of the generation of OHradicals.
강기서(Ki Ser Kang),이은우(Eun Woo Lee),강수용(Soo Yong Kang),이한준(Han Jun Lee),정호중(Ho Joong Jung),김태호(Tae Ho Kim),정평호(Pyeong Ho Jeong) 대한정형외과학회 2004 대한정형외과학회지 Vol.39 No.6
목적: 추체후연과 요추 협부 결손면이 이루는 각도를 축방향 전산화 단층 촬영을 이용하여 분석함으로써 진단 시 통상적으로 쓰이는 45°사면 단순 방사선 촬영의 문제점을 제기하고 척추분리증의 진단을 위한 보다 적절한 방사선 촬영 방법을 제시하고자 하였다. 대상 및 방법: 2001년 1월부터 2002년 7월까지 내원한 44명 환자의 총 84예의 척추분리증을 대상으로 하였다. 모든 예에서 축방향 전산화 단층 촬영을 시행하여 척추분리증을 확진하였고 추체후연과 이루는 각도를 측정하여 평균과 표준 편차를 구하여 이를 통해 다양한 요추 협부 결손면의 각도에 대한 분포를 파악하고, 평균값과 평행하게 사면 단순 방사선 촬영을 시행하여 그 결과에 대하여 분석하였다. 결과: 요추 협부 결손면 각도의 다양성을 관찰할 수 있었으나 추체후연에 대한 각도는 평균 20.9±9.5°로 45°사면보다는 관상면에 가까왔으며 절반 이상인 58예의 결손이 후체후연을 기준으로 23° 이내에 분포하고 있었다. 요추 협부 결손 진단의 민감도는 측면 방사선 사진을 이용 시에 88.1%, 45°사면 방사선 사진을 이용 시에는 78.6%, 20°사면 방사선 사진을 이용했을 때는 100%로, 20°사면 방사선을 이용했을 때 민감도가 증가됨을 알 수 있었다. 결론: 추체후연에 대한 요추 협부의 결손 면의 각도는 평균 약 21°였으며, 관상면에 더 가까웠고 그 분포가 평균치 주위로 모여 있었다. 척추분리증의 진단을 위해서는 지금까지 일상적으로 시행되어 지고 있는 45°사면 단순 방사선 촬영보다는 결손면의 분포 각도인 20°로 사면 촬영을 하는 것이 더 적절하고 예민한 진단법이라 사료된다. Purpose: We analyzed angles of defect planes of spondylolysis from coronal plane using axial computed tomography to identify the problem of 45° oblique plain radiograph by which we routinely has used and to suggest an appropriate radiological diagnostic tool for spondylolysis. Materials and Methods: From January 2001 to July 2002, 84 cases of spondylolysis from 44 patients were studied. The diagnosis of spondylolysis was confirmed with axial computed tomography in all cases and angles of isthmic defect from coronal plane were measured. We intended to assess the distribution of angles of isthmic defect and analyzed the result of plain radiographs which were obtained in the direction parallel to the angle of the mean value. Results: Although angles of lumbar isthmic defects have a wide distribution, the mean value was 20.9±9.5°which was nearer to coronal plane than 45° oblique plane. Fifty eight cases were distributed within 23° from coronal plane. A diagnostic sensitivities were 88.1% in lateral view, 78.6% in 45° oblique view and 100% in 20° oblique view, so a 20° oblique view seemed to be more sensitive in diagnosis of lumbar isthmic defect. Conclusion: Because the mean angle of lumbar isthmic defects from coronal plane was about 21°, oblique view with 20° was more appropriate and sensitive diagnostic tool for spondylolysis than oblique view with 45° which have been used routinely.
임상연구 : 불임 환자에게 시행되는 난자 채취 시 Fentanyl과 Alfentanil을 이용한 정맥 마취의 비교
강용인 ( Yong In Kang ),방은치 ( Eun Chi Bang ),이현숙 ( Hyun Sook Lee ),조경숙 ( Kyung Sook Cho ),김수연 ( Su Yeon Kim ),설정호 ( Jung Ho Sul ),김준영 ( Jun Young Kim ),윤태기 ( Tae Gi Yoon ),석현하 ( Hyun Ha Seok ) 대한마취과학회 2008 Korean Journal of Anesthesiology Vol.55 No.5
Background: This study was carried out to compare the effect of intravenous anesthesia with fentanyl or alfentanil on the hemodynamic profile, sedation, recovery and side effect in the patients undergoing oocyte retrieval. Methods: The patients were designed to receive alfentanil (group A, n=70) or fentanyl (group F, n=70) intravenous anesthesia. The patients were given midazolam 0.6 mg/kg and alfentanil 15 μg/kg in group A or fentanyl 1.5 μg/kg in group F. Propofol 0.7 mg/kg was given if patient was awaken during procedure. Hemodynamic changes, propofol used dosage and initial propofol injecting time, Ramsay Sedation Scales, cough reflex on opioid injection, recovery time, duration of apnea and postoperative nausea, vomiting at the recovery room were recorded. Results: Group A had rapid onset, deep sedation, less amount of propofol used, more frequent apnea than group F. There were no significant differences in postoperative nausea, vomiting and recovery time between the two groups. Conclusions: The intravenous anesthesia with fentanyl or alfentanil are suitable for oocyte retreival but apnea happened more frequent in alfentanil group, so the use of alfentanil needs to monitor ventilation and hemodynamic changes carefully. (Korean J Anesthesiol 2008;55:543~8)