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난관결찰술후 발생된 난관자궁내막증 및 난관루에 관한 연구
조경훈,김정구,장윤석,Cho, K.H.,Kim, J.G.,Chang, Y.S. 대한생식의학회 1987 Clinical and Experimental Reproductive Medicine Vol.14 No.1
The purpose of this study is to evaluate the incidence of endometriosis and tuboperitoneal fistula in remaining tubal segments after tubal ligation. We reviewed 936 tubes which were obtained from 474 patients who received tubal reanastomosis in the Department of Obstetrics and Gynecology in Seoul National University from June, 1980 to June, 1986. The results were as follows: 1. The incidence of tuboperitoneal fistula was 9.31% of the total 936 tubes (87 tubes) and cautery was the most frequent technique of sterilization in fistula formation (15.20%). 2. The incidence of tubal endometriosis was 2.03% of the total 936 tubes (19 tubes) and cautery was the most frequent technique of sterilization in the development of tubal endometriosis (2.73%). 3. The incidence of tuboperitoneal fistula in the remaining proximal tubal segment within 4 cm was 11.25% and the incidence of endometriosis in the remaining proximal tubal segment above 4cm was 5.54%. 4. The incidence of tuboperitoneal fistula within 3 yrs after tubal ligation was 11.92% and the incidence of endometriosis over 6 yrs after tubal ligation was 5.73%.
볏짚의 사료가치 증진을 위한 적정 알카린 H2O2 처리 수준에 관한 연구
문양수(Y . S . Moon),하종규(J . K . Ha),고종열(J . Y . Ko),최연호(Y . H . Choy),조경훈(G . H . Cho),최윤재(Y . J . Choi),한인규(I . K . Han) 한국축산학회 1990 한국축산학회지 Vol.32 No.10
This study was carried out to determine the adequate levels of alkaline hydrogen peroxide treatment for the improvement of nutritive value of rice straw. In vitro digestibility and chemical analysis after several treatments were measured. Treatment variables were soaking time(12, 24, 48 and 96 hrs), temperature(5, 25, 50 and 75℃) of alkaline H₂0₂ solution, H₂0₂ concentration (0.5, 1, 2, 3 and 4%) and substrate /solution ratio (1, 2, 3, 4 and 5g/ml). The results obtained were summarized as follows. 1. The DM digestibilities or rice straw treated with H₂O₂ for 24 and 48 hours were higher than those of the others(p$lt;0.05). There was no differ ences when the rice straw was treated for 12, 72 or 96 hours. Cell wall contents were not affected by the time of treatment. 2. The DM digestibilities were higher at pH 11.5 or above(p$lt;0.05) and was decreased as pH declined. When rice straw was treated with H₂O₂ at pH 11.5 or higher, NDF, ADF and cellulose contents were increased. However, lignin content and DM recovery percentages were decreased. 3. The DM digestibilities were not influenced by the ratio of straw versus liquid. The contents of NDF and cellulose were not affected up to the ratio of 4g rice straw/50m1, but were decreased at 5g rice straw/50m1. Lignin content and DM recovery percentages, however, were increased at 5g rice straw /50m1. 4. The DM digestibilities were not different among treatments at 5, 25 and 50℃. However, the rice straw treated at 75℃ showed lowest digestibility of all treatment (p$lt;0.05). The content of NDF, ADF and cellulose was increased by increasing temperature. However, lignin content and DM recovery percentages were decreased by increasing temperature. 5. The AHP treated rice straw had higher content of ADF and cellulose, and lower content of hemicellulose and lignin as the concentration of H₂O₂, increased. But hemicellulose, lignin and DM recovery percentages were decreased. The NDF content was not different among five different concentrations of H₂0₂ solution. In conculsion, based upon the results of present experiments the most desirable method is to soak rice straw in 1% alkaline H₂0₂ solution at pH 11.5, at room temperatrve (25℃), for 24∼48 hours and at the ratio of 4g rice straw /50m1 solmtion.
볼 타입 공구를 이용한 SPIF 공정의 표면 특성 분석
경준현(J. H. Kyeong),윤형원(H. W. Youn),이병협(B. H. Lee),이선재(S. J. Lee),조경훈(K. H. Cho),이창환(C. H. Lee) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
판재점진성형은 정해진 공구 경로에 따라 판재를 성형하는 공법으로 CNC, 로봇 팔과 같은 공작기계로 성형한다. 일반적으로 반구형 금속공구를 사용하는데 소재와의 마찰로 인해 표면에 공구 자국이 남고, 표면이 손상된다. 이때, 3 축 자유도가 있는 볼 공구가 마찰을 최소화할 수 있는 대안이 될 수 있다. 본 연구에서는 볼 타입 공구를 이용한 점진성형공정의 표면 특성 분석을 수행하였다. 3 축 회전 자유도가 있는 Ball Roller 공구를 제작하고, 같은 공구 직경의 반구형 공구와 비교실험을 실시했다. 실험계획은 다음과 같다. CNC 3 축 가공기에서 SPIF 공정으로 진행했으며, 공구이송속도 4,000 mm/min, 공구회전속도 125 RPM 으로 고정하고, 공구 경로는 Coutour 로 하였다. StepDown은 0.1, 0.25, 0.5, 0.75, 1, 1.5, 2 mm 로 설정하였다. 형상은 사각 피라미드로 AA5052 판재를 성형하였다. 성형된 판재를 표면 거칠기 측정기로 성형면의 Ra, Rz 를 측정하여 공구이동간격에 대한 경향을 비교하였다. 측정결과, 볼 타입 공구와 일반 반구형 공구의 공구이동간격에 대한 Ra, Rz 경향은 유사하였다. 그리고 전자주사현미경과 공초점 현미경을 통해 표면 형태를 분석했다. 일반 반구형 공구는 원소재의 표면 흔적이 없고, 공구와의 마찰 면에 선 속도 차이에 의한 표면 상태가 확인되었다. 볼 타입 공구로 성형했을 경우, 소성변형으로 인한 Orange Peel Effect 가 나타났고, 원소재의 표면 상태를 다소 유지시킬 수 있음을 확인했다.