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.

김수근에 대한 승효상 건축의 수정주의 행보 - 해럴드 블룸의 수정주의 변증법을 중심으로 -

강윤식,강훈,Kang, Yun-Sik,Kang, Hoon 한국건축역사학회 2014 건축역사연구 Vol.23 No.1

Architecture is a product of numerous influences, as shown in the apprenticeships of Kim, Jung-Up and Kim, Swoo-Geun with Le Corbusier's influences. Therefore, its identity is need to be re-defined based on such complex relationships. The rhetorical images of 'the Map of Misreading', as the core of the poetic identification proposed by Harold Bloom's 'the Theory of Influence', provide an efficient way of explaining the relations between architectural apprenticeships and identities. This research is to re-build a new methodology of architectural criticism based on it. The diachronic transformations of the architecture of Seung, Hyo-Sang also had very characteristic 'revisionary ratios' about his precursor Kim, Swoo-Geun. As an antithetic stance of his precursor's final phase, his early days works pursued continuously geometric abstraction and objective images of the architecture of Adolf Loos. However, his recent works are showing the obvious symptoms of regression to his origins. Finally, the architectural identity should be re-conceptualized as a complexity, based on inter-textuality from complex influences. This new architectural identity can be reflected into the modern obsessive identity.

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

강윤식,Kang, Yune-Sik 대한예방의학회 2010 예방의학회지 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.

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.

전공의들의 전문직인식이 직업만족도에 미치는 영향

강윤식,감신,예민해,Kang, Yune-Sik,Kam, Sin,Yeh, Min-Hae 대한예방의학회 1997 예방의학회지 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.

ESG 채권 현황 및 활성화 방안에 관한 연구

강윤식(Yun-Sik Kang),정재만(Jay M. Chung) 강원대학교 경영경제연구소 2020 Asia-Pacific Journal of Business Vol.11 No.1

Recently, ESG bond issuance has been gradually spreading to banks and non-financial private companies in Korea. However, the Korean ESG bond market is still in its infancy in terms of size, diversity and investor base compared to the global ESG bond market. In other words, ESG bonds are rapidly forming in the global market, but are still in the formation stage in the domestic market, and various policy and practical measures such as system, incentives, and infrastructure are needed to activate them. In this paper, we examine the domestic and international status of ESG bonds in relation to responsible investment. In addition, this paper explores specific measures to revitalize the domestic ESG bond market in four aspects: establishing ESG bond standards, procedures and regulations, increasing ESG bond investment demand, increasing ESG bond issuance, building market infrastructure and market efforts. This study is expected to contribute to the development of the domestic ESG bond market and responsible investment.

증례 : 인공호흡기를 이용한 전신마취하 발생한 종격동기종 ( Case Report : Pneumomediastinum Developed under Mechanically Ventilated General Anesthesia )

강윤식(Yeun Sig Kang),김영미(Young Mi Kim),전태완(Tae Wan Jeon),조경행(Kyung Haeng Cho),최영규(Young Kyoo Choi) 경희대학교 경희의료원 1996 慶熙醫學 Vol.12 No.2

삼척 죽서루, 명확한 불확정의 건축교본

강윤식(Kang, Yun-Sik) 한국교육시설학회 2019 敎育施設 Vol.26 No.2

CEO 보상과 기업의 사회적 책임

강윤식 ( Yun-sik Kang ),이재현 ( Jaehyun Lee ),백강 ( Kang Baek ) 한국재무관리학회 2018 財務管理硏究 Vol.35 No.3

본 연구는 최고경영자(CEO)의 보상과 기업의 사회적 책임(CSR) 활동 간의 관계를 실증적으로 분석한다. 본 연구의 실증분석 결과는 다음과 같다. 첫째 CSR과 CEO 보상 간의 관계는 통계적으로 유의한 양의 상관관계를 보여 CSR 활동 수준이 높을수록 CEO 보상 수준이 높은 것으로 나타났다. 둘째 근로자, 협력사 및 경쟁사, 소비자, 지역사회와 같이 사회책임경영 부문을 보다 세분화하여 분석한 결과 CSR과 CEO 보상 간의 통계적으로 유의한 양의 상관관계는 근로자 영역에서만 나타났다. 셋째 이사회 효율성의 수준이 높은 표본 기업의 경우 CSR과 CEO 보상 간의 관계가 통계적으로 유의한 양의 상관관계를 보인 반면, 이사회 효율성의 수준이 낮은 표본 기업의 경우 CSR 활동 수준은 CEO보상과 관련이 없는 것으로 나타났다. 넷째 CEO가 최대주주 일가가 아닌 전문경영인 표본 기업군의 경우 CSR 활동 수준이 높을수록 CEO 보상 수준이 높은 것으로 나타났지만, CEO가 최대주주 일가인표본 기업의 경우 CSR 활동 수준은 CEO 보상과 관련이 없는 것으로 나타났다. 다섯째 이사회 효율성 수준의 고저와 CEO의 최대주주 일가 여부를 동시에 고려하여 분석한 결과에서는 이사회 효율성의 수준이 높고 CEO가 전문경영인인 경우에서만 CSR 활동 수준이 높을수록 CEO 보상이 높은 것으로 나타났다. This study empirically analyzes the relationship between CEO compensation and corporate social responsibility (CSR) activities. The empirical results of this study are as follows. First, the relationship between CSR and CEO compensation shows a statistically significant positive correlation, indicating that the higher the CSR activity level, the higher the CEO compensation level. Second, as a result of more sophisticated analyzes of CSR, such as workers, cooperative companies and competitors, consumers, and local communities, a statistically significant positive correlation between CSR and CEO compensation appeared only in the workers’ area. Third, in the case of sample firms with high level of board efficiency, the relationship between CSR and CEO compensation shows a statistically significant positive correlation. On the other hand, in the case of sample firms with low level of board efficiency, CSR activity level is not related to CEO compensation. Fourth, in the case of a sample firms with a CEO as professional manager, the relationship between CSR and CEO compensation shows a statistically significant positive correlation, while in the case of a sample firms with a CEO as the largest shareholders or their families, the level of CSR activity is not related to CEO compensation. Fifth, according to the result of a simultaneous analysis of the board efficiency level and whether the CEO is the largest shareholders or their families, only when the efficiency of the board is high and the CEO is a professional manager, the higher the level of CSR activity, the higher the CEO compensation.

Proxy TCP ACK를 이용한 무선 환경에서의 TCP 성능향상 연구

강윤식(Yoonsik Kang),장주욱(Ju-wook Jang) 한국통신학회 1999 한국통신학회 학술대회논문집 Vol.1999 No.11