접합부의 비선형 거동을 고려한 강뼈대 구조물의 고등해석과 최적설계

최세휴,박문호,송재호,임청권,Choi, Se Hyu,Park, Moon Ho,Song, Jae Ho,Lim, Cheong Kweon 한국강구조학회 2003 韓國鋼構造學會 論文集 Vol.15 No.6

The advanced analysis and optimal design of semi-rigid frame were presented. Advanced analysis can predict the combined nonlinear effects of connection, geometry, and material on the behavior and strength of semi-rigid frames. The Kishi-Chen power model was used to describe the nonlinear behavior of semi-rigid connections. Geometric nonlinearity was determined using stability functions. On the other hand, material nonlinearity was determined using the Column Research Council (CRC) tangent modulus and parabolic function. The direct search method proposed by Choi and Kim was used as optimization technique. The member with the largest unit value evaluated using the LRFD interaction equation was replaced one by one with an adjacent larger member selected from the database. The objective function was assumed as the weight of steel frame, with the constraint functions accounting for load-carrying capacities, deflections. inter-story drifts, and ductility requirement. Member sizes determined by the proposed method were compared with those derived using the conventional LRFD method. 본 논문에서는 접합부의 비선형을 고려한 강뼈대 구조물의 고등해석과 최적설계를 수행하였다. 고등해석은 접합부의 비선형, 기하학적 비선형 및 재료적 비선형을 고려한다. 접합부의 비선형은 Kishi와 Chen이 제안한 3가지 매개변수를 가지는 파워모델을 사용하여 고려하였다. 기하학적 비선형은 안정함수를 사용하여 고려하였으며, 재료적 비선형은 CRC 접선 탄성계수와 포물선 함수를 사용함으로서 고려하였다. 최적화 기법으로는 Choi와 Kim이 제안한 직접탐색법을 사용하였다. 직접탐색법은 LRFD의 상관방정식으로 계산된 값중에서 최대값을 가지는 부재의 크기를 단계별로 증가시키는 방법이다. 목적함수는 구조물의 중량을 사용하였으며, 제약조건식은 구조시스템의 하중-저항능력, 처짐, 층간 수평변위 및 연성요구 조건을 고려하였다. 제안된 방법에 의한 설계결과를 LRFD방법과 비교하였다.

EDI을 위한 OSI Layer 구현

최정현 광운대학교 인문사회과학연구소 1996 인문사회과학논문집 Vol.25 No.-

숲 문화 체험 학습 프로그램 개발 모형

최인자,류청산 韓國實科敎育硏究學會 2001 實科敎育硏究 Vol.7 No.1

The purpose of this study was to design of experiential learning program that can be utilized in the curriculums in the contents of subjects in elementary school. This study suggests the experiential learning model with three main issues namely six ranges of experiential learning, seven experiential elements, and three steps of development. And it showed the model of experiential learning program design which had five steps. 1.Choose the theme and goal. 2.Set up the range of experiential learning program. 3.Organize each step of experiential learning program activities. 4.Confirm the main experiential element of experiential learning program. 5.Organize each unit activity of experiential learning program step. With this model, experiential learning program of forest culture excursion is developed and suggested. Based on the result of this study, the following considerations are remarked for the substantial improvement of the experiential learning and further studies in this area. 1.Experiential learning should be established a theory. 2.Since this study only concerns with providing the experiential learning program of forest culture excursion, substantial studies verifying the effectiveness of this program should be accomplished. 3.Internet homepage should be managed to apply useful information of experiential learning.

한글.com 분석을 통한 이름공간 모델 연구

최정현 광운대학교 디지털경영연구소 2003 디지털 경영연구 Vol.9 No.-

인터넷의 활성화가 문화적 코드로 발전하여 자국어로 또는 자국문자로 위치 식별 주소를 사용하려는 것이 국제적 추세이다. 이를 위하여 한글 도메인 이름이 인터넷에서 사용되어야 한다는 여론에도 불구하고 한글을 사용한 도메인 이름 공간에 대한 연구가 없으므로 도메인 이름의 개방단계를 2단계로 할 것인지 여부를 결정하지 못하고 있다. 이를 위해서 본 논문은 실증적으로 기업 상호와 "한글.com"에 등록된 이름을 분석하여 한글 도메인의 공간크기를 추정하려는 것이 목적이다. 본 논문은 크기를 추정하기 위한 공간 모델을 제시하고 그것으로 추정한공간을 제안 하면서 앞으로 한글 도메인 정책에 도움이 되는 한글 도메인이름 작명의 방식에 대한 것을 연구한 것이다. As the boom of the Internet leads the Internet into a cultural code, the countries try to do an experiment to use their own languages and character sets for identifying the Internet resources. In Korea, such issues has been discussed among both the Internet-people and laymen because alphabetical identifier is not easy for most Korean internet-people, however, no one has studied on the system to accept Korean-Character domain name which requires new mechanism to translate Korean characters into codes appropriate to communication, and new domain resolution system. Of course the technical comments on the multilingual DNS have been steadily suggested, however, no study on the name space of Korean character domain. In special, considering the opening of the second level domain, the name space will be one of the key issues. In this paper, our target is to get the statistical data and the model for estimating the name space of Korean domain. For this objective, this second level domain names of "thangul.com" excluding ".com" has been analyzed so that the policy of Korean character domain name system would be established correctly. In special, the naming characteristics of Korean enterprises has been focused.

健康한 韓國人의 動脈血液 가스 및 酸一鹽基 平衡値에 對한 觀察

崔震守,曺方煥,朴喜淑,金顯承,金瑛,白正敏,徐錫助 순천향의과대학 1979 Journal of Soonchunhyang Medical Science Vol.2 No.3

The purpose of this paper is to make an attempt in this investigation to determine normal adult values of arterial blood gas and acid-base balance in 53 healthy Korean male and female subjects of varying age and then compare with the data obtained by others. Determinations of the acid-base status of the arterial blood were performed at 37℃ by the Astrup method using a radiometer instruments, consisted of BGA2A/3-MK 2 system. The mean and standard errors of each component were as follows: pH 7.42±0.043, oxygen saturation 96.96±0.089%, pO?? 97.66±0.91mmHg, pCO?? 37.08±0.68mmHg, CO?? content 24.29±0.43mM/L, bicarbonate 23.26±0.68mM/L, buffer base 46.56±0.66mEg/L, and base excess -0.024±0.001mEg/S. Compared with normal adult values in literatures, all the components of the data appear to be in the same range without any significant difference.

한국인의 우쭐심리에 대한 문화심리학적 접근

최상진,박정열,이장주 中央大學校 人文科學硏究所 2000 人文學硏究 Vol.29 No.-

The purpose of this study is to investigate the nature of Korean's Uzzul(boasting) mind and behavior from a cultural psychological perspective. The psychological aspect of Uzzul was examined by adopting the historical, contextual, and representational analyses. First, the historical analysis assessed the concept of Uzzul as recorded in the ancient Korean literature. In addition, the origin of Uzzul and the changes were examined from the topographical, ideological, and psychological perspective. Secondly this study focused on the we-ness relationship to assess the situational contextual analysis. Finally, an open-ended questionnaire was administered to examine the representational analysis. Ninety-one undergraduate students participated in this study. The data were analyzed by the content analysis and the major categories of responses were extracted.

배드민턴 드롭샷 동작의 운동학적 분석

오정환,최수남,정익수 한국운동역학회 2005 한국운동역학회지 Vol.15 No.1

C. H. OH, S. N. CHOI, I. S. JEONG. Kinematic Analysis of the Badminton Drop-shot Motion. Korean Journal of Sport Biomechartics, Vol. 15, No. 1, pp. 221-235, 2005. The purpose of this study was to analyse badminton players' drop-shots, in order to make players understand the principles of drop-shot motion in badminton. Three dimensional analysis was used to measure movements such as the time required per section, the change of center of gravity, joint angle and speed, and joint speed. The results of this study revealed as follows: (1) top players are faster than amateurs in the total time required per section; (2) top players moved more in the x-axis and z-axis, while amateurs moved more in the y-axis; (3) the inclination of amateurs was greater than that of top players in all phases; (4) amateurs showed larger angle on the shoulder joints than top players in the first phase, while top players showed larger angle on the shoulder joint than amateurs in the second and third phase. Amateurs' angle was larger on angle joint in the first phase than top players' ones, while top players' angle was larger in the third phase than amateurs; (5) the speed of racket head of top players was faster than that of amateurs; and the velocity of the center of gravity of amateurs was greater than that of the top players. The findings of this study were that gravity decreases during impact and then the velocity increases to perform the follow-through and making the swing fast by increasing the speed of the racket head is most important.

재생 브라켓의 전단접착강도에 관한 비교 연구

서정훈,최은아 대한치과교정학회 1998 대한치과교정학회지 Vol.28 No.4

본 연구는 열을 이용한 금속 브라켓의 재생 처리시, 기저부 형태와 브라켓 재생 방법에 따른 전단접착강도 및 브라켓 탈락 양상을 비교하고자 시행되었다. 교정 치료를 위해 발거된 건전한 소구치 252개를 수집하고, Type I, Type II, Type III 스탠다드 브라켓을 각각 재생 방법에 따라 네 군으로 나누어 준비된 소구치에 접착하고, Instron Universal Testing Machine(Model 4466)으로 전단접착강도를 측정하였으며, 브라켓의 타락 양상을 관찰하고 브라켓 기저부의 주사전자현미경 소견을 관찰하였다. SP SS 통계처리 프로그램을 이용하여 일원분산분석(oneway ANOVA), Scheffe`s multiple range test를 실시하여 다음과 같은 결론을 얻었다. 1. 브라켓 기저부 형태에 따른 전단접착강도는 유의차가 있었으며(P<0.001), 그 크기는 Type III(round indentation, micro-etched base), Type I(foil-mesh base), Type II(grooved integral base, micro-etched)의 순이었다. 2. 재생 방법에 따른 전단접착강도는, Type I, Type II 브라켓에서는 Big Jane에 1분간 처리시 우수한 결과를 보였고(p<0.05), Type III 브라켓에서는 각 군간 유의한 차이를 보이지 않았다.(p>0.05). 3. Type I, Type II 브라켓은 기저부-레진 계면에서 가장 높은 빈도로 탈락하였고, Type III 브라켓에서는 레진의 절반가량이 치면에 잔존하는 탈락 양상이 가장 많았다. 4. 탈락 양상에 따라 탈락시의 전단접착강도가 유의성 있는 차이를 보였는데(p<0.05), 브라켓 탈락시 접착제의 절반가량이 치면에 잔존하는 경우 전단접착경우가 가장 큰 것으로 나타났다. 5. 브라켓 재생 후 기저부에 남아 있는 접착제는 전단접착강도의 감소에 영향을 미치지 않았다. This study was undertaken to compare the bond strength and the fracture site of new and recycled brackets according to the base design. 252 sound premolars extracted for orthodontic treatment were collected, and Type I, Type II, Type III brackets were divided into four groups by recycling method. Each bracket was then bonded to an extracted premolar. Instron Universal Testing Machine(model 4466) was used to measure the shear bond strength, and the surface of the recycled brackets were viewed in SEM. For the analysis of the results, one way ANOVA and Scheffe`s multiple range test was executed using the SPSSWIN program. 1. The shear bond strength showed statistically significant difference according to the bracket base design (P<0.001). Type III bracket(round indentation base, micro-etched) showed the highest bond strength, Type I bracket(foil-mesh base) was second, and Type II bracket(grooved integral base, micro-etched) was last. 2. The effect of recycling on the bond strength was different according to bracket type. The shear bond strength of Type I, Type II brackets showed the smallist reduction when treated for 1 minute in Big Jane(p<0.05), but the shear bond strength of Type III brackets showed no statistically significant difference according to recycling method(p>0.05). 3. In Type I, Type II brackets, frequent fracture site was bracket-resin interface, but in Type III brackets, about half of the resin was retained on the tooth surface frequently. 4. The shear bond strength was highest when about half of the resin was retained on the tooth surface(p<0.05). 5. The resin remnant on the bracket base after recycling had no effect on the shear bond strength.

가로변 건축물 외관에 있어서 창의 이미지 특성에 관한 연구

이청웅,양동협,강형구,최환석 朝鮮大學校 建設技術硏究所 2000 建設技術硏究 Vol.20 No.1

The window in architecture has a mysterious role connecting the indoor and outdoor world and also an interaction. this study investigates the functions of the past and present windows and its functions which will be required in future and aims a t seeking a planning direction of desirable window by integrating the understanding of window plan in outdoor space of building and new design techniques. The origin of window and its developmental process are expressed primarily by internal functions and it has been discussed from the external viewpoint with the development of structure, materials and social and cultural aesthetic sense. Accordingly it describes the history and place of windows to define the functions of windows and Chapter 2 states the forms, functions and treatments of window opening part according to the times. Chapter 3 cites the cases of the prototypes of forms shown in the outside of building as the functional and design elements windows in building. Chapter 4 suggests the positive cases of window prototype which produces the outdoor space of modern architecture and examines the correlation of it to the various elements according to the objective methods and order on the basis of SD method. Consequently, the windows in building should be planned by considering the following: 1. The window must be faithful to its original purposes. 2. It should be based on a great design because it is an important part which shows the appearance of building in urban area. 3. As today's buildings are large-scaled and high storied and also have unique characteristics, the development of construction technique and the production of good materials and products should be made. 4. The various general factors of windows should be analyzed and considered in planning windows as well as its design and technical sides.

건축물 외장의 배색 유형에 관한 연구 : 광주광역시 금남로 가로 건축물을 중심으로

이청웅,최석창,김양석,하주아 조선대학교 국토개발연구소 1997 국토개발연구 Vol.17 No.1

Since the urban environmental colors as a starting point of the research on environmental colors of the building depend on the environmental characteristics of the complex and various physical and social culture to improve the visual order of the urban landscape and don't establish its system and order, the importance of the visual effects of urban environment has been suggested through the experimental and theoretical research. It is to want to abstract the factor of surface pattern from the side of two dimentional physical factor and perceptual of architecture surface construction by concreting calssifing the criterion of analysis in to rank phase, perceptual concept, finding out basic composition factor of shape and opening architecture surface construction of design. To suggest the material of mere practical color design, this study examines the research of exterial colors of the building on the street, prescribes the characteristics of the building with other environmental factors which compose the colors and aims at suggesting the actual color design materials making the trend of colors the object of the research.