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- 저자 : 오경수(Kyung Su Oh) (검색결과 4 건)
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오경수(Kyung Su Oh),신영길(Yeong Gil Shin),신병석(Byeong-Seok Shin) 한국정보과학회 2000 정보과학회논문지 : 시스템 및 이론 Vol.27 No.1
We present a method that enhances the rendering speed of z-buffer algorithm using temporal coherence between two contiguous frames on fixed viewing conditions. Conventional z-buffer algorithm stores depth value for each pixel on a view plane while rendering some polygons, then it determines the visibility of the remaining polygons based on the stored depth values. If we can get color and depth information for some polygons without rendering, it is possible to generate an image by rendering only the remaining ones. In case of high frame rate, we can find the fact that sets of static polygons of the two contiguous frames are almost the same. This temporal coherence enables us to get the color and depth information of static polygons efficiently. Our algorithm stores color and depth information of static polygons and reuses it for generating the next frame. This method can be easily implemented since it does not require complex data structure and modification for conventional z-buffer algorithm. Also it is adequate for hardware implementation. 이 논문에서는 시점이 고정된 경우 프레임간의 시간 일관성을 이용해서 z-버퍼 알고리즘의 렌더링 속도를 향상시키는 방법을 제안한다. z-버퍼 알고리즘은 일단의 다각형들을 렌더링하는 동안 각화소의 깊이 값을 저장해서 나머지 다각형들을 렌더링할 때 이들의 가시성을 판별하는데 사용한다. 만약 일부 다각형들에 해당하는 색상과 깊이 정보를 렌더링을 하지 않고도 얻어 낼 수 있다면, 나머지 다각형들만을 렌더링해서 동일한 화상을 얻을 수 있다. 화면의 갱신주기가 짧은 경우 연속된 두 프레임에서 움직임이 없는 다각형들의 집합은 상당히 큰 일관성을 가진다. 이러한 시간 일관성을 이용하면 연속한 프레임에서 움직임이 없는 다각형들의 색상과 깊이 정보를 새롭게 계산할 필요가 없다. 이를 위해 고정된 다각형들의 색상과 깊이 정보를 따로 저장해두었다가 재사용하는 방법을 제안한다. 이 방법은 복잡한 자료구조를 사용하거나 기존 z-버퍼 알고리즘 자체를 바꾼 것이 아니므로 구현이 쉽고 하드웨어로 구현하기도 용이하다.
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긴 관상동맥 병변에 대한 제1세대 및 2세대 약물용출 스텐트 중첩 시술 후 2년간 임상 경과의 비교
오경수 ( Kyung Soo Oh ),정명호 ( Myung Ho Jeong ),이정애 ( Jung Ae Rhee ),최진수 ( Jin Su Choi ),이두환 ( Doo Hwan Lee ),김정훈 ( Jeong Hun Kim ),박수환 ( Soo Hwan Park ),김인수 ( In Soo Kim ),현대용 ( Dae Yong Hyun ),정윤아 ( Yun 대한내과학회 2015 대한내과학회지 Vol.89 No.2
Background/Aims: Despite improved revascularization techniques, the clinical outcomes of patients with diffuse coronary artery lesions after percutaneous coronary intervention are unsatisfactory. However, few studies have compared the efficacy of first- and second-generation drug-eluting stents (DES) in patients with diffuse long coronary artery lesions. Methods: Between January 2006 and July 2012, 364 patients who were treated with DES for long coronary artery stenosis (> 30 mm) were enrolled in this study and assigned to either Group I (first-generation DES, 62.3 ± 10.4 years, 136 males, n = 183) or Group II (second-generation DES, 64.3 ± 10.7 years, 134 males, n = 181). The incidence of major adverse cardiac events (MACE) was compared between the two groups over 2 years of follow-up, and predictive factors associated with MACE were evaluated through a multivariate analysis. Results: Although several coronary angiographic characteristics were different between the two groups, most demographic and baseline clinical variables were the same. The cumulative incidence of MACE was significantly higher in Group I than in Group II (25.7 vs. 6.6%, p < 0.001), mainly due to reduced target lesion revascularization (21.9 vs. 2.2%, p < 0.001). According to the results of the multivariate analysis, the use of a paclitaxel-eluting stent (PES) (hazard ratio [HR], 5.168, 95% confidence interval [CI], 2.515-10.617, p < 0.001), decreased left ventricular function (≤ 45%, HR, 3.586, 95% CI, 1.839-6.990, p < 0.001), and diabetes mellitus (HR, 2.984, 95% CI, 1.605-5.548, p < 0.001) were independent contributors to MACE.
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오경수,범정철,하종욱,박인준,소원욱,이수복 한국공업화학회 2004 응용화학 Vol.8 No.1
We report on the surface proputies of the films composed of polysiloxane and trimethoxyperfluorosilane(TMPFS). In this study, the PFS was introduced in order to enhance soil-proof property of siloxane polymer. Surface properties of the mixture were investigated. Contact and sliding angle measurements were done in order to investigate the anti-soil, and soil release properties, respectively. The surface free energy of siloxane polymer was decreased remarkably by incorporation of small quantity of PFS with the increment of contact angle and decrease of sliding angle. The TMPFS/Polysiloxane mixture film may provide a great opportunity for the antisoil applications.
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Kim, Jae-Won,Oh, Kyung Su,Park, In Jun,Ha, Jong Wook,So, Won Wook,Lee, Soo-Bok 한국공업화학회 2003 응용화학 Vol.7 No.2
In this study, in order to enhance soil-proof property of siloxane polymer, the perfluoroalkylsilane (PFS) was introduced, and surface properties of the mixture were investigated. Contact angle and sliding angle measurements were done for anti-soil, and soil release properties, respectively. The surface free energy of siloxane polymer was decreased remarkbly by incorporation of small quantity of PFS with the increment of contact angle and drcreas of sliding angle.
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