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전복막외접근 복강경 탈장교정술과 Lichtenstein 탈장교정술: 조기 수술결과와 합병증의 비교
류정석,박순철,김기환,안창혁,김정수,유승진,임근우,조항주 대한내시경복강경외과학회 2009 Journal of Minimally Invasive Surgery Vol.12 No.2
Purpose: This study compared the postoperative outcomes and complications between laparoscopic totally extraperitoneal (TEP) hernia repair and open Lichtenstein hernia repair. Methods: A total of 64 cases (30 cases by the TEP method and 34 cases by Lichtenstein repair) were enrolled in this study. The operative time, the hospital stay, the VAS score, the amount of analgesic used, the postoperative complications and recurrence were compared between the 2 methods. Results: The mean operative time was 71 min for the TEP group, which was not significantly longer than that for the Lichtenstein group (66 min). The mean postoperative hospital stay was 3.7 days for the TEP group, which was significantly shorter than that for the Lichtenstein group (4.2) (p=0.035). The mean postoperative analgesic dose was 0.9±0.7 and 1.1±1.0 within 24 hours and 0.2±0.5 and 0.7±0.8 after 24 hours, respectively. The dose of analgesic after 24 hours was significantly lower for the TEP group (p=0.011), but the dose within 24 hours and the total dose was not significantly different. The VAS score was 2.3±1.0 and 2.6±0.9 at 12 hrs and 1.2±0.8 and 1.7±0.8 at 48 hrs, respectively. The VAS score was significantly lower for TEP group than that for the Lichtenstein group at 48 hrs (p=0.011), but there was no significant difference between the groups at 12 hrs. There was one recurrence in the TEP group. Conclusion: For the TEP group, the hospital stay was significantly shorter than that for the Lichtenstein group and this is maybe because the postoperative pain after 24 hours from the operation was less for the TEP group. Laparoscopic TEP repair may be performed efficiently with an acceptable operating time and a shorter hospital stay, as compared to open Lichtenstein hernia repair.
Conformal Invariants of Submanifolds in Rn+1
柳井錫 弘益大學校 科學技術硏究所 1994 科學技術硏究論文集 Vol.5 No.-
Extrinsic Invariant로서 Isometry 군에대한 불변량은 다양체의 Principal Curvature들만의 함수로 표시된다는 사실을 밝혔으며, Conformal 변환 군에대한 불변량은 다양체의 Principal Curvature들의 비만의 함수로 표시된다는 사실을 밝혔다.
류정석,조형상 중앙대학교 의과대학 의과학연구소 1986 中央醫大誌 Vol.11 No.4
The present experiments is to evaluate the possibility of replacing the invasive method by the noninvasive one, namely systolic time interval method for monitoring hemodynamic changes occuring during the induced hypotension employed in clinic for the safety measure. For this purpose, various hemodynamic parameters were measured by both invasive and noninvasive STI methods simultaneously in mongrel dogs following the induction of hypotensive state by drugs, nitroprusside and nitroglycerin or bleeding procedure. The data obtained by these two different methods were analysed for the above purpose of this study. The following results were obtained. 1) In the hemodynamic changes checked by the invasive method, there were marked in preload and systemic vascular resistance (p<0.05 and p<0.01) in all induced hypotensive groups, but no significant changes in heart rate in those groups. Cardiac output was not changed in nitroprusside and bled groups, but markedly increased in nitroglycerin group (p<0.01). 2) Comparing the data of invasive method with those of noninvasive STI method, correlation coefficient of tension time index(TTI) to rate-pressure product(RPP) was 0.85, and that of endocardial viability ratio(EVR) to diastole/systole(dT/sT) was 0.96. Therefore RPP and dT/sT are supposed to be the useful indices of cardiac function monitoring in the use of induced hypotensive method.
열병합 발전소용 목질계 바이오매스의 연소 특성에 관한 연구
류정석 ( Jeong Seok Ryu ),김기석 ( Ki Seok Kim ),박수진 ( Soo Jin Park ) 한국공업화학회 2011 공업화학 Vol.22 No.3
본 연구에서는 열병합 발전소의 원료로서 목질계 바이오매스로 임목 부산물, 폐목재, 야자수 부산물, 야자수 껍질의 연소 특성을 조사하기 위하여 열중량 분석기를 이용하여 연소 실험을 수행하였다. 목질계 바이오매스의 비교군으로는 일반적인 석탄을 사용하였다. 열중량 분석기 결과로부터, 목질계 바이오매스의 연소는 석탄과 비교하여 낮은 온도인 280 ℃에서 420 ℃ 구간에서 가장 활발한 연소반응을 보였음을 확인 할 수 있었다. 열중량분석에 의하여 측정된 활성화 에너지에 있어서 임목 부산물은 석탄 및 기타 목질계 바이오매스와 비교하여 가장 낮은 활성화 에너지 값을 나타내었으며, 또한 목질계 바이오매스의 경우 석탄과 비교하여 연소반응속도가 크게 증가함을 확인 할 수 있었다. 이는 목질계 바이오매스의 높은 연소개시 속도를 보이는 것을 나타내며, 이러한 결과는 석탄과 비교하여 낮은 비등점의 휘발분을 많이 포함하는 목질계 바이오매스의 특성에 기인하는 것으로 판단된다. In this work, various wood biomasses were used to determine the combustion characteristics for the fuel of cogeneration plant. Combustion characteristics of four types, i.e., (i) forest products, (ii) recycled wood, (iii) empty fruit bunch, and (iv) palm kernel shell, were examined via thermal gravimetric analyzer (TGA) in air atmosphere and coal was used as a comparison group. From the TGA results, the combustion of the wood biomass was occurred in the range of 280 to 420 ℃, which was lower than that of coal. Forest product showed the lowest activation energy (0.4 kJ/mol) compared to that of other wood biomasses (about 6 to 14 kJ/mol) and coal (64 kJ/mol). In addition, the reaction rate constant of the wood biomass was lower than that of coal. These results indicate the higher combustion initiation rate of wood biomass due to the high content of volatile matter, which had a low boiling point.
Spherical CR Manifolds with Amenable Holonomy and Complex Hyperbolic Structure
Ryu, Jeong-Seog,Hong, Kyung-Hwa 弘益大學校 科學技術硏究所 1994 科學技術硏究論文集 Vol.5 No.-
복소 다양체를 연구하는 데 있어서 자연스러운 질문이면서 또한 근본적인 질문은 언제 홀수차원의 다양체 M이 analytic space의 경계인가 하는 것이다. 우리는 본 연구를 통하여 M이 spherical CR manifold 이고 M의 홀로노미 군이 amenable 일 때 R. Miner의 연구결과를 이용하여 M이 특별히 복소 쌍곡면 공간이 경계가 되는 것을 밝혔다.
조형상,승익상,구길회,류정석,조성강 중앙대부설한국의과학연구소 1981 한국의과학 Vol.13 No.1
김기석 ( Ki Seok Kim ),최은아 ( Eun A Choi ),류정석 ( Jeong Seok Ryu ),이용표 ( Yong Pyo Lee ),박종연 ( Jong Yeon Park ),최승후 ( Seung Ho Choi ),박수진 ( Soo Jin Park ) 한국공업화학회 2012 공업화학 Vol.23 No.5
본 연구에서 반탄화 우드칩은 저온 열처리 방법에 의하여 제조하였고, 열처리 온도에 따라 제조된 반탄화 우드칩의 열분해 특성과 발열량을 측정하였다. 반탄화 우드칩의 기초 열분해 특성을 조사하기 위하여 열중량 분석기를 이용하였고, 발열량은 발열량 측정기를 이용하여 확인하였다. 열중량 분석기 결과로부터, 저온에서 열처리된 열처리 샘플은 순수 우드칩과 유사한 200 ℃에서 400 ℃ 구간에서 가장 활발한 열분해 반응을 보였고, 반면에 열처리 온도의 증가에 따라 제조된 반탄화 우드칩의 초기 열분해 온도는 증가하는 것을 확인할 수 있었다. 또한, 반탄화 우드칩의 발열량은 열처리 온도의 증가에 따라 증가하는 것을 확인하였다. 이는 열처리 온도 증가에 따라 우드칩의 주성분인 셀룰로오스, 헤미셀룰로오스, 그리고 리그닌의 부분적인 탄소화에 의한 탄소함량의 증가에 기인하는 것으로 판단된다. In this work, a semi-carbonized wood chip (SC-WC) was prepared by heat-treatment at low carbonization temperature. The pyrolysis characterization and heating value of the SC-WC at different heat-treatment temperature were evaluated. The pyrolysis characterization and heating value of the SC-WC were determined using thermal gravimetric analyzer (TGA) in N2 atmosphere and calorimeter, respectively. From the TGA results, the thermal decomposition reaction of the SC-WC treated at by low temperature was similar to pure wood chip and the reaction was most actively occurred in the range of 200 ℃ to 400 ℃, whereas the initial thermal decomposition temperature of the SC-WC increased with the increasing heat-treatment temperature. In addition, the heating value of the SC-WC showed a similar trend as to the decamposition temperature behavior. This is probably attributed to increased carbon content of SC-WC by the localized carbonization of the wood chip which consisted of cellulose, hemi-cellulose, and lignin.