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임상연구 : 경막외마취를 이용한 흉강경 수술시 Remifentanil의 목표 농도 주입의 효과
이도원 ( Do Won Lee ),김태균 ( Tae Kyun Kim ),백승훈 ( Seung Hoon Baek ),신상욱 ( Sang Wook Shin ),백승완 ( Seong Wan Baik ),권재영 ( Jae Young Kwon ) 대한마취과학회 2006 Korean Journal of Anesthesiology Vol.51 No.3
Background: Video assisted thoracoscopic surgery (VATS) can be performed under epidural anesthesia. However, epidural anesthesia dose not provide complete analgesia during VATS. In that case, remifentanil may provide adjuvant analgesia. The aim of this study was to find safe and effective target concentration of remifentanil during VATS under epidural anesthesia. Methods: Patients were randomly allocated to target concentration of remifentanil 1 or 2 ng/ml (Group N1 or N2). Thoracic epidural catheter was inserted at T6-7 or T7-8 and 0.75% ropivacaine 6 ml was administered. Patients were positioned in lateral position and remifentanil infusion was started. If patients complained of pain, target concentration of remifentanil was elevated by 0.5 ng/ml. Hemodynamic and respiratory variables were checked during anesthesia. The degree of sedation was evaluated with Ramsey sedation scale and modified Steward recovery scale was used to evaluate recovery. Results: There was no significant difference between 2 groups in hemodynamic and respiratory variables. N2 group showed more sedation on skin incision (P < 0.05). The incidence of pain complaint in N1 group was higher than those of N2 group (P < 0.05). There was no significant difference in the incidence of side effects and ephedrine administration. Conclusions: Remifentanil target concentration of 2 ng/ml is more effective than 1 ng/ml to reduce pain without significant side effects during VATS under thoracic epidural anesthesia. (Korean J Anesthesiol 2006; 51: 318~23)
크라우드 소싱과 데이터 마이닝을 이용한 미술 작품 해설 핵심 키워드 추출 및 미술관 오디오 가이드 서비스 방법
이도원(Lee Do Won),홍태림(Hong Tae Lim),조준동(Cho Jun Dong) 한국HCI학회 2020 한국HCI학회 학술대회 Vol.2020 No.2
본 연구는 관람객의 작품 감상에 도움을 주기 위한 목적으로 데이터 마이닝을 이용한 미술관의 오디오 가이드서비스 개선에 대한 연구이다. 크라우드 소싱(Crowd sourcing)을 통해서 미술 작품에 대한 해설 자료를 수집하여, 텍스트 마이닝 (Text mining)을 실시하여 각 작품의 핵심적인 부분인 최다 빈출 키워드를 추출하여, 사용자들이 해당 단어를 취사 선택할 수 있도록 했다. 사용자들이 각 key word 를 선택하면 해당 부분에 대한 미술비평가의 해설을 제공한다. 본 서비스가 실제로 관람객의 감상에 도움을 주었는지 검증을 하기 위해 다양한 연령의 30 명을 대상으로 기존의 오디오 가이드와 데이터 마이닝을 활용한 오디오 가이드를 비교 체험하고 설문조사를 진행하였으며, 설문조사 결과를 토대로 실제로 작품 감상에 도움이 되었음이 검증되었다.
생태학적 ${\cdot}$ 육수학적 현상들에 대한 프랙탈의 적용
장현정,강신규,이도원,Chang, Hyun-Jeong,Kang, Sin-Kyu,Lee, Do-Won 한국하천호수학회 2000 생태와 환경 Vol.33 No.2
Fractal geometry has become one of prospective research approaches as the complex structure of natural entities is not easily characterized by traditional Euclidean geometry. With the fractal geometry, we can better decipher the complex structure and identify natural and anthropogenic agents of landscape patterns occurring at different spatial scales. The usefulness of fractal, however, has not been fully appreciated among Korean academic societies, especially in ecological and limnological fields. We attempt to address three points in this study. First, we introduce the concept and dimension of fractal and review relevant research approaches, especially with respect to ecological and limnological phenomena. Second, we explore possible applications of fractal to some aspects of geography and land use characteristics in South Korea. For the analyses of fractal dimensions, we used data published in other studies previously and collected for this study. Data were analyzed by a perimeter/area method of fractal dimension for the spatial distribution of global solar radiation and leaf area index, and the movement of wild boars in forested landscapes of mid-eastern Korea. The same approach was also applied to the water channel of a hypothetical river and the shape of reservoirs in Yongin, Kyunggi Province. Finally, we discuss the results and key issues to consider when a fractal approach is employed in ecology and limnology.
임상연구 : 경막외 자가조절진통을 시행한 위부분절제술 환자에서 Sevoflurane과 함께 투여한 Remifentanil의 효과
윤상훈 ( Sang Hun Ryu ),이도원 ( Do Won Lee ),권재영 ( Jae Young Kwon ) 대한마취과학회 2007 Korean Journal of Anesthesiology Vol.53 No.1
Background: Remifentanil is an ultra-short acting opioid, and its use has been known to be related to acute opioid withdrawal or tolerance. This study was performed to compare the hemodynamic response, recovery characteristics, and postoperative pain response after sevoflurane-remifentanil or sevoflurane anesthesia in subtotal gastrectomy patients. Methods: Sixty patients scheduled for gastrectomy were andomly allocated into two groups. Thoracic epidural catheterization was performed before anesthesia. Anesthesia was maintained with sevoflurane-remifentanil (SR group) or sevoflurane (SN group). We compared hemodynamic variables during surgery and recovery, the pain and sedation score during recovery, and the pain core and analgesic requirements during the postoperative period. Results: Intraoperative blood pressure and heart rates in the SR group were lower than in the SN group. There was no significant difference in extubation time and recovery time between patients in the two groups. The patients in the SN group showed more prompt recovery at 15 minutes after extubation. The VAS scores and analgesic demand of the SR group were greater than in the SN group. Conclusions: Intraoperative use of remifentanil with sevoflurane may be related to increased postoperative pain. (Korean J Anesthesiol 2007; 53: 35~41)