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SFX 자바스크립트 엔진 적시 컴파일 오버헤드 감소를 위한 context threading 기법 적용
권진우(Jin-Woo Kwon),오형석(Hyeon-Seok Oh),문소묵(Soo-Mook Moon) 한국정보과학회 2011 한국정보과학회 학술발표논문집 Vol.38 No.2A
적시 컴파일 방식은 실시간으로 머신 코드를 생성하여 생성한 머신 코드로 프로그램을 동작시키기 때문에 인터프리터 방식에 비해 수행 속도가 빠르다. 그러나 적시 컴파일 과정이 런타임에 일어나기 때문에 컴파일 오버헤드가 발생하게 된다. 본 논문은 이를 개선하기 위해 context threading 기법을 적시 컴파일에 적용한다. 실험 결과 기존 적시 컴파일 방식에 비해 런타임 성능은 나빠졌으나 적시 컴파일 오버헤드에 있어서는 25%의 감소를 보였다.
이충길,권진우,손경태,신승호,이우세 ( Choong Gil Lee,Jin Woo Kwon,Kyoung Tae Sohn,Sung Ho Shin,Woo Se Lee ) 대한슬관절학회 1997 대한슬관절학회지 Vol.9 No.1
Local anesthesia for arthroscopic procedure of the knee is an increasinglv popular technique that avoids the use of general anesthesia and the associated risks of respiratory depression, aspiration, and postoperative sedation. Many authors, for example McGinty etc., Martin, Yoshiya etc., advocated local anesthesia as safe and efficient method for arthroscopic procedures of the knee. We performed arthoroscopy of the knee under local anesthesia on 150 patients for diagnostic and operative purposes between January l993 and December l996. The technique of local anesthesia that we used was that 20cc of 0.5%; bupivacaine with I:200,000 epinephrine was injected into superolateral portal of the knee joint and additional 10-20cc ot 1% lidocaine into the arthroscopic portals. Pnevmatic tourniquet wa, not applied in all cases. We analysed the 150 cases and the results were as follows; The diagnostic arthroscopy was performed in 50 cases and the operative arthroscopy was in 100 cases. The duration ot local anethesia was from 4 hours to 12 hours, with an average of 6 hours. In 35 cases arthroscopy was performed as outpatient procedure and average hospital stay excluding other problem was 5 days. No complication related to systemic toxicity by local anesthetics was observed. Conclusively arthroscopy of the knee under local anesthesia is safe and effective procedure to avoid the risks of general anesthesia but patients selection is very important.
최진아(Jin A Choi),권진우(Jin Woo Kwon),지동현(Donghyun Jee) 대한안과학회 2018 대한안과학회지 Vol.59 No.9
목적: 녹내장의 추적관찰 주기와 녹내장의 진행 정도의 정량적 관계에 기초한 비용효용분석을 시행하고자 하였다. 대상과 방법: Markov 모델을 구축하여 초기 녹내장을 가지고 있는 40세 이상의 한국인 남녀를 가상의 코호트로 설정하였다. 녹내장 치료 관련 비용을 사회적인 관점에서 파악하였으며, 효용은 녹내장 상태에 따른 질보정수명을 산출하였다. 녹내장 건강상태는 5단계로 나누었다(초기, 중기, 후기, 단안실명, 양안실명). 녹내장 상태의 전이는 경도에서 중등도로 한 방향으로만 전이하는 것으로 하였고, 각 한 주기의 길이는 1년으로 설정하였다. 비용효용의 점진적 증가비율을 계산하여 추적관찰 주기에 따른 비용효용을 비교하였다. 민감도 분석을 시행하여 본 연구에서 사용한 변수의 불확실성이 어떻게 결과에 영향을 주는지를 파악하였다. 결과: 3개월 추적관찰의 점진적 비용효용비는 6개월의 추적관찰 대비 질보정수명당 28,244,398원이며, 6개월 추적관찰의 점진적 비용효용비는 12개월 추적관찰 대비 질보정수명당 13,615,443원으로 나타났다. 3개월 대비 6개월 주기 추적관찰의 진행확률이 약 10% 이상 증가하고, 3개월 대비 12개월 추적관찰의 진행확률이 약 15% 이상 증가하는 경우에는 3개월 주기 추적관찰이 비용효과적인 것으로 나타났다. 반면, 3개월 대비 6개월 추적관찰의 진행확률의 증가폭이 10% 미만이고, 3개월 대비 12개월 추적관찰의 진행확률이 15% 이상 증가할 경우 6개월 추적관찰이 비용효과적인 것으로 나타났다. 3개월 대비 6개월 추적관찰 전략의 진행확률 증가폭이 10% 를 넘고, 3개월 대비 12개월 추적관찰의 진행확률 증가폭이 15% 미만이면 12개월 추적관찰이 비용효과적인 것으로 나타났다. 결론: 본 연구에서 녹내장의 진행확률에 따라 비용효과적인 추적관찰의 전략이 다르며, 3개월 또는 6개월의 추적관찰 전략이 비용효 과적이며 우리나라의 의료보건체계에서 받아들일 수 있는 정도인 것으로 나타났다. <대한안과학회지 2018;59(9):842-847> Purpose: To evaluate the cost-utility based on the quantitative relationship between glaucoma follow-up and glaucoma progression. Methods: The Markov model was constructed and analyzed to determine the cost-effectiveness of primary open-angle glaucoma. The Markov model set up a virtual cohort of Korean over 40 years of age with early glaucoma. The costs associated with glaucoma treatment were assessed from a social point of view, and the utility was calculated using the quality adjusted life years according to the glaucoma states. Glaucoma health status was divided into 5 stages (early, middle, late, unilateral, bilateral blindness). The transition probability was set in one direction from mild to severe, and the length of each cycle was set at one year. The incremental cost effectiveness ratio (ICER) was calculated and compared with each other different follow-up periods. Sensitivity analysis was conducted to determine how the uncertainty of the variables used in this study affected the outcome. Results: ICER of 3-month follow-up was 28,244,398 won/quality adjusted life years (QALY) compared 6-month follow-up, and ICER of 6-month follow-up was 13,615,443 won/QALY compared to 12-month follow-up. If the probability of progression of glaucoma in 6-months follow-up observations increases by more than 10% over 3-month periodic follow-up and the progression probability of 12-month follow-up increases by more than 15% follow-up compared to 3-months follow-up, 3-months follow-up was found to be a cost-effective strategy. On the other hand, 6-month follow-up was found to be cost-effective if probability of progression of 6-month follow-up was less than 10% increase of 3-month follow-up and 15% increase of 6-months follow-up. Conclusions: Cost-effective follow-up strategies differed according to the probability of progression of glaucoma, and 3-month or 6-month follow-up strategies were cost-effective and acceptable in Korea s health care system. J Korean Ophthalmol Soc 2018;59(9):842-847
슬관절 반월상 연골판 파열의 진단에서 이학적 검사의 중요성
이충길,권진우,박재흠,이상훈,이영석 ( Choong Gil Lee,Jin Woo Kwon,Jae Hyun Park,Sang Hoon Lee,Young Seok Lee ) 대한슬관절학회 1996 대한슬관절학회지 Vol.8 No.2
Clinical diagnosis of meniscal lear is frequently difficult even for an experienced surgeon, thus many clinical tests and diagnostic studies have been developed. Although diagnostic accuracy is improving with the use ot arthvoscope and MRI, a carefully taken history and physical examination remain the standard methods fov confirming a meniscal tear. From June 1993 to Decemher l995, 80 knees of arthroscopically diagnosed meniscus tear were studied ret-ospeclively on the basis of bistories and physical examinations, especially knee joint effusion, joint line tenderness, and McMurray test. Statistical analysis of the data obtained from 80 knees revealed as follows. I. The positive finding of joint line tenderness was in 61cases (76.3%), knee joint effusion was in 55 cases (68.8%) and McMunay test was in 52 cases(657n). And at least one of the three physica1 findings was positive in 77 cases (96.3%), two of the three wcre positive in 51 cases(63.8%). 2. The positive frequency of joint line tenderness was higher in anterior born tear and that of McMurray test was higher in midportion, or posterior ho. Knee joint effusion was severe in comhined cases of unterior cruciate ligament tear and Bucket-Handle tear. 3. In case of positive for all 3 physical findings, we thought it to he desirable that arthroscopy was done divectly for diagnosis and treatment. 4. We concluded that thorough history taking and physical examination wouJd he enough to make a diagnosis of meniscus tear.