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TPR-트리에서 경계 사각형의 사장 공간을 줄이기 위한 효율적인 MBR 근사 기법
최석창(Seok-Chang Choi),송문배(Moon-Bae Song),강상원(Sang-Won Kang),황종선(Chong-Sun Hwang) 한국정보과학회 2004 한국정보과학회 학술발표논문집 Vol.31 No.2Ⅱ
이동 객체의 현재와 미래 위치 질의에 최적화된 색인 구조로써 TPR 트리가 있다. TPR 트리는 기존의 공간 색인 구조와 달리 이동 객체와 경계 사각형을 참조 위치와 속도 벡터를 매개 변수로 한 시간에 대한 선형 함수 형태로 모델링함으로써 갱신 비용을 줄이고 현재 및 가까운 미래 위치 정보의 예측을 가능하도록 한다. 하지만 TPR 트리는 시간의 경과에 따라 경계 사각형이 선형적으로 확장됨으로 인해 경계 사각형 내의 객체를 제외한 나머지 공간인 사장 공간과 경계 사각형들 간의 겹침 현상을 증가시켜 질의 성능이 떨어진다는 단점을 가진다. 본 논문에서는 질의 성능을 향상시키기 위하여 경계 사각형 내의 이동 객체들이 이동함에 따라 변경되는 최소 경계 사각형 (MBR : Minimim Bounding Rectangle)을 베지어 곡선 함수를 이용하여 근사함으로써 사장 공간을 줄이는 적응 경계 사각형(ABR : Adaptive Bounding Rectangle) 기법을 제안한다.
김무오(Kim. Mu-Oh),최석창(Choi. Seok-Chang),이청웅(Lee. Cheong-Woong) 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1
This study is to draw index of discriminating visual word "seeing" among several expressions of vision used in our daily life in relation to view and visual behaviors and examine the relationship between visual behavior and view based on this index.<br/> <br/> <br/> <br/> <br/> <br/>
교반기용 임펠러가 달린 축의 베어링 지지점에 따른 진동특성
홍도관(Do-Kwan Hong),안찬우(Chan-Woo Ahn),백황순(Hwang-Soon Baek),최석창(Seok-Chang Choi),박일수(Il-Soo Park) 한국기계가공학회 2009 한국기계가공학회지 Vol.8 No.3
This paper deals with the dynamic characteristics of the impeller shaft model which is the most important part in developing the resin mixing machine. The can is rotating by air motor in mixing machine. Then the end of shaft is fixed. The bearing support is to increase the fundamental natural frequency. The natural frequency analysis using finite element analysis software are performed on the imported commercial impeller shaft model. This paper presents calculated bearing stiffness of Soda, Harris and modified Harris formula considering contact angle according to bearing supported position. The most important fundamental natural frequency of the impeller shaft except bearing support is around 13.932 ㎐. This paper presents one bearing and two bearings support position to maximize the 1st natural frequency. The maximized fundamental natural frequency is around 48.843 ㎐ in one bearing support and 55.52 ㎐ in two bearings support.
실험계획법을 이용한 엔드밀 가공 시 최대가공온도와 표면조도에 미치는 가공조건에 관한 연구
홍도관(Do-Kwan Hong),안찬우(Chan-Woo Ahn),백황순(Hwang-Soon Baek),최석창(Seok Chang Choi),박일수(Il-Soo Park) 한국기계가공학회 2009 한국기계가공학회지 Vol.8 No.3
To find the working condition is one of the important factors in precision machining. In this study, we analyzed maximum working temperature by infra-red camera and surface roughness in side wall end milling using design of experiment (DOE); RSM(response surface methodology), ANOM(analysis of means) and ANOVA(analysis of variance) by table of orthogonal array. ANOM and ANOVA are well adapted to select sensitivity of design variables for maximum working temperature and surface roughness. The effective design variables and their levels should be determined using ANOM, ANOVA. RSM is presented 2nd order approximation polynomial of maximum working temperature and surface roughness is composed with design variables. Therefore, it is expected that the proposed procedure using design of experiment ; table of orthogonal array, ANOM, ANOVA and RSM can be easily utilized to solve the problem of working condition.
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.
안찬우,최석창,이희범,이봉진 東亞大學校 建設技術硏究所 1997 硏究論文集 Vol.21 No.1
This paper presents with dual dynamic vibration absorber consisting of mass, coil spring and oil damper attached to primary vibration system with damping. The effects of dual dynamic vibration absorber were investigated with optimizing equation which equalizes the height of amplitude ratio in the resonance frequency of the primary vibration system and numerically obtaining curves of resonance frequency ratio on the primary vibration system and dual dynamic vibration absorber according to mass ratio, natural frequency ratio and damping ratio of dynamic vibration absorber. The variation of amplitude ratio related to frequency ratio of primary vibration system is verified experimentally and theoretically according to dual dynamic vibration systems using computer program designed to find mutual relationship between dual dynamic vibration absorber.