GHT의 병렬 처리 구현에 관한 연구 ( The Study of The Parallel Implementation of the Generalized Hough Transform )

하선우,채옥삼 대한전자공학회 1992 대한전자공학회 학술대회 Vol.1992 No.11

인문,사회과학편 : 대학생 여가활동참여자의 여가동기, 여가활동 관여도 및 대학생활적응의 관계

하선우(SunWooHa) 한국체육학회 2010 한국체육학회지 Vol.49 No.2

본 연구는 여가활동에 참여하는 대학생의 여가동기, 여가활동 관여도 및 대학생활적응의 관계를 규명하는데 목적이 있다. 이를 위해 총 637부의 자료를 실제분석에 사용하였으며, 빈도분석, 신뢰도 분석, 상관관계분석, 중다회귀분석, 경로분석을 수행하여 다음의 결과를 도출하였다. 첫째, 여가동기와 여가활동 관여도의 관계에서는 즐거움, 중요성, 자기표현 인지는 내적, 외적동기가 모두 정적 영향력을 가지며, 무동기는 부적 영향력을 나타냈다. 위험가능성, 위험결과성 인지는 외적, 무동기가 모두 정적 영향을 나타냈다. 여가활동 관여도와 대학생활적응의 관계에서는, 학업적, 사회적 적응은 자기표현 인지, 개인·정서적 적응은 위험가능성 인지, 일반적 적응은 즐거움 인지가 가장 크게 영향을 미치는 것으로 나타났다. 둘째, 여가동기와 여가활동 관여도 및 대학생활 적응간에는 인과관계가 있으며, 여가동기와 여가활동 관여도의 일부 하위변인은 대학생활적응에 직접효과를 나타내며, 여가동기는 여가활동 관여도를 매개로 하여 대학생활적응에 간접효과를 나타낸다. The purpose of this study was to examine the relationship among leisure motivation, leisure involvement and the university life adjustment in leisure activities of students. To achieve the purpose of this study, students who were getting to a university in Seoul, were selected as population of this study. After selecting 10 universities by mean of stratified cluster random sampling method, a total of 637 subjects were used for data analysis. To analyze data, multiple regression and path analysis were conducted. The results of this study as follows; First, intrinsic, extrinsic motivation are positively, amotivation are negatively significant in pleasure, importance, sign of leisure involvement. Also, extrinsic motivation and amotivation has a positive influence on risk probability and risk consequence of leisure involvement. And, sign has the most strong effect on academic and social adjustment(risk-probability : personal, emotional adjustment, pleasure : institutional adjustment). Second, this result was exposed to the caused relationship among leisure motivation, leisure involvement and the university life adjustment.

RPS 제도 도입에 따른 민간 석탄 발전소의 최적 발전량 감소 메커니즘 연구

하선우(Sun-Woo Ha),이상중(Sang-Joong Lee) 대한전기학회 2015 대한전기학회 학술대회 논문집 Vol.2015 No.7

균형선형모형에서의 사영행렬의 계산

선우하식 建國大學校 附設 自然科學硏究所 1992 建國自然科學硏究誌 Vol.3 No.-

The design matrix X of the balanced linear model y=Xβ + ε can be expressed in terms of Kronecker product of matrices of 0's and 1's. Also if we use the properties of the Moore-Penrose inverse, the projection matrix P??=X(X'X)­X' can be computed without computing the generalized inverse (X'X)­ of X'X. This can reduce a lot of the computational works and computational storages. In this paper, we derive an iterative method for finding the projection matrix of the balanced linear model with interaction effects or not.

대학생 여가활동참여자의 여가활동 관여도, 여가권태 및 대학생활적응의 관계

하선우(SunWooHa),남윤신(YounShinNam) 한국체육학회 2010 한국체육학회지 Vol.49 No.3

본 연구는 여가활동에 참여하는 대학생의 여가활동 관여도와 여가권태 및 대학생활적응의 관계를 규명하는데 그 목적이 있다. 이를 위해 총 668부의 자료를 실제분석에 사용하였으며, 빈도분석, 신뢰도 분석, 상관관계분석, 중다회귀분석, 경로분석을 수행하여 다음과 같은 결과를 도출하였다. 첫째, 여가활동 관여도의 하위변인 중 즐거움 인지, 중요성 인지, 자기표현 인지의 경우 여가권태에 부적 영향력을 가지며, 위험가능성 인지는 정적 영향력을 가지는 것으로 나타났다. 또한, 여가권태는 대학생활적응에 부적인 영향을 미치는 것으로 나타났다. 둘째, 여가활동 관여도의 일부 하위변인과 여가권태는 대학생활적응에 직접효과를 가지며, 여가활동 관여도는 여가권태를 매개로 하여 대학생활적응에 간접효과를 나타냄으로써 각 변인간의 인과관계를 파악할 수 있다. The purpose of this study was to examine the relationships among leisure involvement, leisure boredom and the university life adjustment in leisure activities of students. To achieve the purpose of this study, students who were getting to a university in Seoul, were selected as population of this study. After selecting 10 universities by mean of stratified cluster random sampling method, 890 students were sampled for this study. A total of 668 subjects were used for data analysis. Instruments used in this study were modified consumer involvement profile, leisure boredom scale, university life adjustment scale, To analyze data, multiple regression and path analysis were conducted. The results of this study as follows; First, pleasure, importance, sign of leisure involvement are negatively significant, risk probability are positively significant in leisure boredom. Also, leisure boredom is negatively significant in the university life adjustment. Second, this result was exposed to the caused relationship among leisure involvement, leisure boredom and the university life adjustment.

MULTI-DEGREE REDUCTION OF B¶EZIER CURVES WITH CONSTRAINTS OF ENDPOINTS USING LAGRANGE MULTIPLIERS

선우하식 충청수학회 2016 충청수학회지 Vol.29 No.2

In this paper, we consider multi-degree reduction of B¶ezier curves with continuity of any (r; s) order with respect to L2 norm. With help of matrix theory about generalized inverses we can use Lagrange multipliers to obtain the degree reduction matrix in a very simple form as well as the degree reduced control points. Also error analysis comparing with the least squares degree reduction without constraints is given. The advantage of our method is that the relationship between the optimal multi-degree reductions with and without constraints of continuity can be derived explicitly.

RPS제도 도입에 따른 민간 석탄 발전소의 최적 발전량 결정 메커니즘 연구

하선우(Sun-Woo Ha),이상중(Sang-Joong Lee) 대한전기학회 2016 전기학회논문지 Vol.65 No.7

A private company"s 1,000 MW coal-fired power plant will be the first coal-fired power plant that was included in the 5th ‘Basic Plan on Electricity Demand and Supply‘ (2010). Now it is facing the task to abide by the RPS(Renewable Portfolio Standard) policy after commercial operation. If they fail to supply the necessary REC (Renewable Energy Certificate) mandated by the RPS policy, they are subject to be fined by the government and forced to modify the cost function to reflect the burden. Eventually the company"s coal-fired power plant will be forced to reduce generation to maximize profit because the amount of electricity generated by the power plant and the REC obligation is positively correlated. This paper analyzed the change of cost function of private coal-fired power plant according to the introduction of RPS policy from the viewpoint of private company, and finally proposed the optimal generation to maximize the profit of private coal-fired power plant under the current RPS policy.

초고압 및 초음파 추출공정을 이용한 매자나무 수피의 향장활성 증진

하지혜,최운용,서용창,김지선,김영옥,차선우,김진철,이현용 한국약용작물학회 2011 한국약용작물학회지 Vol.19 No.1

This study was performed to investigate the enhancement of cosmeceutical activities of Berberis koreana bark by different extraction processes. The extracts are WE (water extract at 100℃, control), USE (ultrasonification for 1 hours at 60℃ with water), HPE (high pressure for 5 minutes at 60℃ with water) and USE + HPE (ultrasonification process for 1 hours after high pressure for 5 minutes at 60℃ with water), respectively. The cytotoxicity of the extracts was in the range of 24.02~26.94% at 1.0 mg/ml concentration. The USE + HPE showed the lowest cytotoxicity. Compared to the WE, total phenolic and flavonoid contents in the USE + HPE increased to 121.5% and 154.2%. The USE + HPE showed the highest activity at 1.0 mg/ml concentration in 1,1-diphenyl-2-picryl-hydrazyl (DPPH) radical scavenging, inhibition activity of xanthine oxidase and superoxide dismutase (SOD)-like test, respectively. Tyrosinase inhibition of WE, USE, HPE and USE + HPE at 1.0 mg/ml concentration was measured as 17.72, 19.62, 22.83 and 24.16%, respectively. Hyaluronidase inhibition activities of the USE + HPE were higher than 20.8%~29.5% of the WE. Our results suggested that the extracts from ultrasonification process after high pressure extraction has relatively high cosmeceutical activities, and that the bark of Berberis koreana could be considered as a candidate of new functional cosmetic agents.

Some interesting combinatorial identities

Sunwoo, Hasik 建國大學校 自然科學硏究所 2002 建國自然科學硏究誌 Vol.13 No.1

There are various identities about binomial coefficients. In this paper we derive some interesting combinatorial identities using polynomial expansion. Also we will derive some interesting combinatorial identities containing multiplications of two or three binomial coefficients. These identities can be proved using the results of the basis transformations of polynomial space.

A Study on the Efficient Computational Algorithms for Computing Test Statistics in the Unbalanced Linear Model Based on the Corresponding Balanced Linear Model

Sunwoo, Hasik 건국대학교 자연과학연구소 1998 建國自然科學硏究誌 Vol.9 No.1

본 논문에서 불균형선형모형 y=Xβ+ε에서의 가설 H0:L'β = m 의 검정통계량을 구하는 알고리즘에 대하여 논하고자 한다. 일반적으로 불균형모형에는 많은 양의 자료가 포함되어 있어 검정통계량을 구하는 데 상당한 양의 기억용량과 계산을 필요로 한다. 모형의 각 칸(cell) 에 단 하나씩의 관측치를 포함하고 있다고 가정하면 균형모형이 되며 이때의 모형행렬 X0와 원래의 불균형선형모형의 모형행렬 X 사이에는 X=TX0 라는 매우 밀접한 관계가 성립하는데 이 때 T는0과 1로만 구성된 매우 간단한 행렬이다. 본 논문에서는 균형선형모형에서 필요한 행렬들을 매우 쉽게 계산하고 모형행렬간의 관계식을 이용하여 원래의 불균형모형에서의 검정통계량을 보다 적은 기억용량을 이용하여 구하는 알고리즘을 연구하고자 한다. In this paper we are interested in the hypothesis test of the hypothesis H0 : L'β= m of a given unbalanced linear model y = Xβ +ε. In general it is required lots of computational storage to obtain the test statistics. The corresponding balanced linear model is defined by assuming there exists only one observation in each cell. The design matrix X of the given unbalanced linear model and the design matrix simple matrix X0 of the corresponding balanced linear model have very close relationship, namely X=TX0. where T is a simple matrix containing 0's and 1's in regular arrangement. Using the results of the corresponding balanced linear model, we can compute the test statistics very easily and we can save lots of computational storage and also computational efforts.