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개복 수술한 부인과 환자에서 수술 후 조기 경구 영양공급의 임상적 유용성
노종환,노종환(Jong Hwan Roh),김영태(Young Tae Kim),홍순옥(Soon Oak Hong),김재욱(Jae Wook Kim) 대한산부인과학회 2000 Obstetrics & Gynecology Science Vol.43 No.4
Objective: This study was performed to evaluate the feasibility, safety, and tolerance of early postoperative oral feeding in gynecologic patients who have underwent intra-abdominal surgery. Thus, we investigated the clinical efficacy of early postoperative oral feeding in gynecologic patients, prospectively. Methods: From September 1998 to March 1999, we studied 80 gynecologic patients undergoing laparotomy at Department of Obstetrics and Gynecology, Yonsei University College of Medicine, prospectively. After surgery, the patients were grouped into two arms; the first early oral feeding group began a clear liquid diet on the first postoperative day and advanced to regular diet as tolerated. the second control group received nothing by mouth until return of bowel function. Results: Although more patients in the study group developed nausea, the incidence of vomiting and abdominal distension were comparable in both groups. Time to development of bowel sound and flatus were significantly shorter in study group. Postoperative complications including pneumonia, atelectasis, wound complications, and febrile morbidity occurred insignificantly in both group. Postoperative changes in hematologic indices and electrolytes were comparable in both group. Conclusion: Early postoperative oral feeding in gynecologic patients undergoing intra-abdominal surgery is safe, well tolerated. We believe that re-evaluation of postoperative surgical care may increase our knowledge and better serve our patients.
3D 프린팅으로 적층 제조한 Open-cell 구조의 열적 특성 연구
노종환(J. H. No),김민겸(M. K. Kim),김동원(D. W. Kim),김주원(J. W. Kim),김태환(T. H. Kim),서종환(J. Suhr) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
3D 프린팅으로 적층 제조 가능한 Open-cell 구조는 특정 형상의 Unit-cell을 규칙적인 배열로 구성하여 경량(Lightweight), 고강도/강성(High Strength/Stiffness), 에너지 흡수(Energy Absorption) 등 다양한 기계적 특성을 부여할 수 있다. 그뿐만 아니라 Open-cell 구조의 넓은 전열 면적을 활용하여 열원으로부터 전도된 열에너지를 대류를 통해 방출 함으로서 탁월한 열에너지 관리 능력도 부여할 수 있어 최근 글로벌 환경규제 및 에너지 효율화 요구 측면에서 자동차, 철도, 항공 우주 등 수송 분야의 부품 소재로서 관심이 증가하고 있다. 본 연구에서는 Powder Bed Fusion (PBF) 기법으로 적층 제조한 다양한 Open-cell 구조의 열적 특성을 평가하고 설계 방안을 제시하고자 한다. 높은 비표면적(High Specific Surface Area)을 지닌 Open-cell 구조의 적층 공정 특성상 발생하는 Support 구조를 고려하여 제조 가능한 Cell 크기와 형상을 설계하였으며, 열전도 실험을 통해 정상(Steady) 및 과도(Transient) 상태에서의 열적 거동을 분석하였다. 실험 결과 Open-cell 구조의 표면에서 발생하는 대류 효과를 통해 기존 Solid 구조보다 열저항이 증가하고 열전도도가 감소함을 확인할 수 있었다. 본 연구에서 평가된 Open-cell 구조의 열적 특성은 향후 수송 분야 뿐만 아니라 공정 과정에서 고열이 발생하는 플랜트 및 금형 등 광범위한 산업에서 고효율/고기능 소재로서 활용될 것으로 사료된다.
포상기태 환자에서 악성 임신성 융모종양의로의 전환에 관여하는 임상 및 생물학적 인자들의 역할
김영태,김재욱,박용규,최은경,조은미,노종환,강경숙,조동제 대한부인종양 콜포스코피학회 2000 Journal of Gynecologic Oncology Vol.11 No.3
Objective: The purpose of this study is to reevaluate the prognostic factors by investigating the clinical and biological parameters concerned malignant gestational trophoblastic tumor in patients with hydatidiform mole. Methods: From March 1995 to February 2000, 41 patients admitted to department of the Obstetrics and Gynecology, Yonsei University College of Medicine who were diagnosed with pathologically-proven gestational trophoblastic disease were selected. Parameters such as age, gravida, parity, presence of theca lutein cyst, ratio of uterine size to gestational age, hCG level, DNA ploidy, S-phase fraction were compared between malignant gestational trophoblastic tumor group and spontaneous remission group. Results: Considering the clinical prognostic factors, the patients were divided into two age groups; the first group consisted of those older than 40 years of age and the second control group consisted of those under 40. The number of patients older than 40 in the spontaneous remission group and malignant gestational trophoblastic tumor group were 4(15.4%) and 7(46.7%), respectively, showing a significantly higher number in the group over 40years. Other parameters such as gravida, parity, presence of theca lutein cyst, ratio of uterine size to gestational age, hCG level, DNA ploidy, S-phase fraction showed no statistically significant difference between the two groups. Conclusion: The progression rate from hydatidiform mole to malignant gestational trophoblastic tumor was significantly higher in patients over 40 years of age. Therefore, more aggressive therapeutic approach should be considered in such patients.