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        • GPU상에서 동작하는 Ray Tracing을 위한 효과적인 k-D tree 탐색 알고리즘

          강윤식,박우찬,서충원,양성봉,Kang, Yoon-Sig,Park, Woo-Chan,Seo, Choong-Won,Yang, Sung-Bong 한국정보과학회 2008 정보과학회논문지 : 시스템 및 이론 Vol.35 No.3

          This paper proposes an effective k-D tree traversal algorithm for ray tracing on a GPU. The previous k-D tree traverse algorithm based on GPU uses bottom-up searching from a leaf to the root after failing to find the ray intersected primitive in the leaf node. During the bottom-up search the algorithm decides the current node is visited or not from the parent node. In such a way, we need to visit the parent node which was already visited and the duplicated bounding box intersection tests. The new k-D tree traverse algorithm reduces the brother and parent duplicated visit by using an efficient method which decides whether the brother node is already visited or not during the bottom-up search. Also the algorithm take place bounding box intersection tests only for the nodes which is not yet done. As a result our experiment shows the new algorithm is about 30% faster than the previous. 본 논문은 GPU상에서 작동되는 ray tracing을 위한 효과적인 k-D tree 탐색 알고리즘을 제안한다. 기존의 k-D tree를 위한 GPU 기반 탐색 알고리즘은 임의의 단말노드에서 교차되는 primitive를 찾지 못한 경우. root 노드 방향으로 bottom-up 탐색하여 부모 노드에서 bounding box 교차검사를 이용해 형제 노드의 기 방문 여부를 판단한다. 이러한 방법은 이미 방문한 부모 노드의 방문과 bounding box 교차검사를 중복적으로 수행한다. 본 논문에서 제안하는 알고리즘은 bottom-up 탐색을 수행 할 때 형제노드가 이전에 방문했는지를 확인할 수 있는 효율적인 방법을 제시함으로써 형제노드 및 부모로드의 방문을 생략하도록 하고, 또한 아직 방문하지 않은 노드에 대해서만 bounding box 교차검사를 수행함으로써 중복된 연산을 피한다. 결과적으로 본 논문의 실험은 기존 알고리즘 대비 제안하는 알고리즘이 약 30%의 성능 향상이 있음을 보여 준다.

        • KCI등재
        • KCI등재

          예방의학 영역에서 심신의학적 접근의 적용 가능성: 스트레스 관리를 위한 이완과 명상 기법을 중심으로

          강윤식,Kang, Yune-Sik 대한예방의학회 2010 Journal of Preventive Medicine and Public Health Vol.43 No.5

          Objectives: Emotional support and a stress management program should be simultaneously provided to clients as effective preventive services for healthy behavioral change. This study was conducted to review various relaxation and meditation intervention methods and their applicability for a preventive service program. Methods and results: The author of this paper tried to find various relaxation and meditation programs through a literature review and program searching and to introduce them. The 'Relaxation Response' and 'Mindfulness Based Stress Reduction (MBSR)' are the most the widely used meditative programs in mainstream medical systems. Abdominal breathing, Progressive Musclular Relaxation (PMR), Relaxative Imagery, Autogenic Training (AT) and Biofeedback are other well-known techniques for relaxation and stress management. I have developed and implemented some programs using these methods. Relaxation and meditation classes for cancer patients and a meditation based stress coping workshop are examples of this program. Conclusions: Relaxation and meditation seem to be good and effective methods for primary, secondary and tertiary preventive service programs. Program development and standardization and further study are needed for more and wider use of the mindbody approach in the preventive service area of medicine.

        • SCOPUSKCI등재

          전공의들의 전문직인식이 직업만족도에 미치는 영향

          강윤식,감신,예민해,Kang, Yune-Sik,Kam, Sin,Yeh, Min-Hae 대한예방의학회 1997 Journal of Preventive Medicine and Public Health Vol.30 No.1

          In ordo to investigate the professional job perception and job satisfaction of interns and residents and its related factors, the author conducted survey using self administered questionnaire for 2 months(August and September, 1996). The study subjects were 562 interns and residents who worked at one university hospital(tertiary hospital) and two general hospitals(secondary hospital) in Taegu, Korea. Among them, 297 (52.8%) responded completely. The results were as follows ; Respondents thought that people component was most important, science and status components were next among professional value scales which meant the desirable attitudes required to conduct professional works. But, the score of professional value scales was generally high and not affected by other variables in multiple linear regression analysis. They seemed to have very normative and ideal perceptions about professional values. The score of professionalism scales, which were attitudinal and behavioral traits about professional job, of high grade residents was significantly higher than that of interns and lower grade residents. The score of reference to professional organization and autonomy factor were increasing significantly as the grade increased. Working conditions and perception for socioeconomic status of doctors influenced the score of professionalism scale significantly. It seemed that professional socialization was made during the training periods of interns and residents. Most of respondents answered that current socioeconomic status of doctors were middle and high strata but they responded that the socioeconomic status of doctors would fall in the future. They seemed to have a pessimistic thought about doctor's status. Generally the respondents thought that they were satisfied with doctor job and fit to the job, but 51.9% answered that if possible they would get other jobs. It seemed to reflect their critical thinking on doctors' status. Perceptions about socioeconomic status of doctors, professional value and professionalism influenced job satisfaction significantly. The interns and residents had high sense of calling to doctors and thought that doctors were socially important job. Generally they were satisfied with their job. Interns and residents had normative thoughts about the trait which compentent doctors must have. During the training period, they seemed to have attitude and perception as a professional and to make professional socializations.

        • SCOPUSKCI등재

          외래환자에서 금연 성공의 결정요인

          강윤식,장정순,황영실,홍대용,김장락,Kang, Yune-Sik,Jang, Joung-Soon,Hwang, Young-Sil,Hong, Dae-Yong,Kim, Jang-Rak 대한예방의학회 2003 Journal of Preventive Medicine and Public Health Vol.36 No.3

          Objective : This study was conducted in order to investigate predictors of smoking cessation in outpatients. Method : Subjects were 40f adult smoking patients who saw their doctors in the outpatient setting at a university hospital, regardless of their willingness of otherwise in smoking cessation. Physicians delivered a brief, stop smoking prompt to all patients who smoked one or more cigarettes a day. Then they referred to on-site counselors who provided a brief, nurse assisted intervention with a survey to a randomly assigned intervention group (200 smoking patients), whom the counselors telephoned later to prevent relapse or promote the motivation to quit, or gave only a survey to a control group (201 smoking patients). After at least 5 months, self-reported current smoking cessation was confirmed later using cut-off values of 7 ppm or less in expired alveolar air after breath holding portable CO analyzer. Results : After 5 months, subjects in the intervention group were 1.56 times (95% C.I. 0.89-2.73) more likely to quit smoking than those in the non-intervention group (14.0% vs. 9.0%). Willingness to quit smoking in a month, scheduled admission in a month, self efficacy score and FTND (Fagerstrom Test for Nicotine Dependence) score were all significantly related with smoking cessation. In stepwise multiple logistic regression, previous attempts to quit smoking were significant instead of self efficacy score. In the intervention group who had willingness to quit smoking in a month (132 smoking patients), FTND score, whether quit date was today, and whether quit promise paper was submitting were all significantly related with smoking cessation. In stepwise multiple logistic regression, scheduled admission in a month and whether quit date was today were significant predictor variables, Smoking cessation treatment should be tailored to individual smoking patients considering these predictors.

        • KCI등재

          기업의 사회적 책임 활동과 자본비용 간의 관계에 관한 연구

          강윤식(Yun-Sik Kang),김문섭(Moon-Seop Kim) 한국무역연구원 2016 貿易 硏究 Vol.12 No.5

          '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

          We concentrate on the relationship between corporate social responsibility (CSR) and the cost of capital, because prior researches often focus on firm performance and research on cost of capital is scarce, despite equity and debt being a primary source of external capital. More specifically, this paper examines the effect of CSR on the cost of equity, cost of debt and weighted average cost of capital (WACC). For this empirical research, we take a comprehensive approach that examines various dimensions related to CSR, namely, environment, society and governance as well as sub-dimensions of society (i.e., employees, related companies, consumers and the community). For a sample of 2,400 Korean firm-year observations from 2011 to 2014, we find that firms with a better CSR score exhibit lower cost of capital (cost of equity, cost of debt and WACC) after controlling for other firm specific determinants. These findings support arguments in the literature that firms with socially responsible practices have higher valuation and lower risk.

        • 구역화를 이용한 3차원 격자 데이터의 리파인먼트 단순화

          강윤식(Yoon-Sig Kang),양성봉(Sung-Bong Yang) 한국정보과학회 1999 한국정보과학회 학술발표논문집 Vol.26 No.1B

          본 논문에서는 grid 형태의 height data의 지형을 greedy insertion algorithm을 이용하여 TIN(Triangulated Irregular Network)의 단순화된 지형정보를 생성해 내는 향상된 알고리즘을 제시한다. greedy insertion algorithm[1]은 전체 terrain을 포함할 수 있는 2개의 base triangle을 생성한 후 maximal local 또는 global error를 갖고 있는 point를 원하는 수의 point또는 threshold에 도달할 때까지 반복적으로 추가하는 방법을 통하여 원하는 resolution의 terrain triangulation을 얻어내고 있다. 이와 같은 greedy insertion algorithm을 소개하고 있는 최근의 논문 중 가장 빠른 수행 성능을 보이고 있는 알고리즘의 경우 전체 n개의 point로 이루어진 grid data로부터 m개의 point를 가지고 있는 triangulation을 생성해 내는데 평균 O((m+n)logm)의 수행 시간이 소요되고 있으나[2], 본 논문에서는 terrain data를 가로 k x 세러 l 개의 sub-block으로 partitioning을 한 후 각 sub-block단위로 greedy insertion algorithm을 적용시켜 simplification을 행함으로 평균 O((m+n)log m+n/k×l)의 수행 성능의 향상과 enlonged triangle들의 억제효과를 보여주고 있다.

        • KCI등재

          기업의 지배구조, 사회적 책임 활동과 기업가치에 관한 연구

          강윤식(Yun-Sik Kang),위경우(Kyeong-Woo Wee) 한국무역연구원 2017 貿易 硏究 Vol.13 No.5

          '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

          This study empirically examines which of the following two competing points of view, the agency problem viewpoint or the value enhancement viewpoint, is supported by corporate social responsibility (CSR) activities in Korea. Using fixed effects model, this study also investigates to see if the economic effects of the CSR activities are manifested differently depending on the corporate governance structures of the firms by using the anti-takeover provisions (ATPs) of the listed companies as proxy variables of corporate governance. Results reveal that CSR activities have a positive economic effect on firm value, thereby supporting the value enhancement viewpoint. Moreover, the positive effect of CSR on firm value is statistically significant when the firms do not have ATPs, but becomes insignificant when firms have ATPs. This implies that the value enhancement point of view is supported in companies with good corporate governance while the agency problem point of view is supported in companies with poor governance. Our results are robust even when the instrument variable is introduced to control the endogeneity problems.

        • KCI등재

          기업의 사회적 책임 활동이 기업의 위험에 미치는 영향

          강윤식(Yun-Sik Kang),위경우(Kyeong-Woo Wee) 한국무역연구원 2017 貿易 硏究 Vol.13 No.1

          '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

          This study empirically analyzes the effect of corporate social responsibility (CSR) activities on the risk of the firm by looking at their influences on total risk, systematic risk, idiosyncratic risk and business risk, respectively. The main results are as follows. First, there exists a significant negative relationship between the level of CSR activities and the total risk of the firm. This result is consistent with those of previous researches that assert the positive role of CSR activities. Second, there is a negative relationship between the level of CSR activities and systematic risk. This implies that firms with higher levels of CSR activities are likely to have less sensitivity to the risks associated with economic fluctuations. Third, there is also a negative relationship between the level of CSR activities and idiosyncratic risk. This may result from the fact that CSR activities lessen firm specific inefficiencies by reducing firm specific risks (such as litigation risk, brand and reputation risk, labor dispute, and consumer boycott) which are important factors of a firm’s profitability. Finally, we find that there is a significant negative relationship between the level of CSR activities and business risk. This result suggests that CSR activities have a real effect on the performance factors of the firm such as customer loyalty.

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