비등방성 확산 필터링된 영상 슬라이스들의 볼륨 렌더링에 관한 연구

신문걸,김태형,박용기,김두영 동아대학교 정보기술연구소 2001 情報通信硏究所論文誌 Vol.9 No.1

The goals of this paper are not only to reduce of noise using anisotropic diffusion filter post-processing but also to represent 3-D image using 2-D image slices by volume rendering. A 3D shape image can be obtained as the 2-D images are continuously acquired, during the object is removed noise by filtering. The 3-D shape images are displayed on computer monitor by use of OpenGL Software.

인장력을 받는 ㄱ형강 접합부의 감소계수 U값에 관한 연구

표영석,윤성호,나승욱,신영록,김보영,최문식 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)

This study focuses on the inspect of effective net area design code, according to limited state design criteria of steel structures, recently established in Korea, by an experiment on the joint of angle tension members on the ground. reduction factor. The methods of this study were to compare other study results on effective net area rupture mode and ultimate capacity, and to evaluate the propriety of the criteria design code. The result is that code in force limited state design criteria of steel structures and AISC-LRFD joint of angle tension members predicted load and experiment depend on ultimate capacity difference. Therefore, it is thought that there is need for supplemental test and study to effective net area of tension joint focused on bolted connection of angle.

초고층 건축물의 횡력 저항 시스템에 관한 연구

김영학,한범석,안종문,신성우 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)

Recently residential tall buildings have been prosperous in Korea with the type of multi-used building since late 1990s. Although 6 buildings ranked in world tallest building Top 200 have been built in Seoul, over 100-stories building isn't presented yet. The characteristics of Korean super-tall buildings are described; ① located in Seoul city, Kyung-gi do Sung-nam city, and Busan city ② the height between 100m and 200m ③ multi-used building. The purpose of this study is to find out the behavior of tall building in point of displacement contribution factor calculated by the principle of virtual work. Consequently present the most effective members for controling lateral drift control by analysis using computer programs on a real structural model.

퍼지모델링을 이용한 저속비대선의 선미형상 주요치수 결정

김수영,김현철,정성재,하문근,안당,신수철 釜山大學校生産技術硏究所 1998 生産技術硏究所論文集 Vol.55 No.-

본 연구에서는 유전자 알고리즘을 적용한 퍼지모델링 기법을 이용하여 저속비대선에서 선미형상의 주요치수를 결정하고, 이를 실적선과 비교하였다. . This paper presents a method that determines the stern profile dimensions for full, slow-speed ship using fuzzy modeling, applied the genetic algorithm and compares with the database of ships

레미콘 회수수의 안정적 재활용을 위한 교반수조의 설비유형 효과

이문환,이세현,박영신,박재명 대한건축학회 2005 大韓建築學會論文集 : 構造系 Vol.21 No.2

Using the sludge water in producing ready mixed concrete, which is generated as washing surplus concrete after completing manufacturing and transportation of concrete is the best method in meeting the issue of cost of production and environment. However, in reality, using sludge water decreases Quality, and solid ingredients adhere to the transportation line of sludge water and the basin of sludge water, agitated to prevent precipitation of sludge, which incurs tremendous amount of repair expenses. In order to resolve the problems above, we have studied stable methods of supplying sludge water and experimentally reviewed the types of facilities. The result showed that a facility that added stabilizing agents which retarded hydration of unhydrated cement in sludge water for certain periods (2-3 days) and simultaneously agitated and moved by air diffusion and vertical flat blade impeller was most effective in stabilizing concentration of solid and preventing precipitation of solid in the bottom of basin. In addition, the performance of agitation and prevention of adherence of reaction basin of sludge water depended on selective efficiency of sand grain, and it has been studied that buffering inconsistent band of circulation of sludge water by operating the ring blower for air diffusion to the maximum was advantageous to preventing managing concentration and prevention of adherence.

우리나라 輸出保險制度에 관한 硏究

성문기,공신영 昌原大學校 産業經濟硏究所 1993 産經硏究 Vol.10 No.-

물-LiBr吸收式 冷凍사이클의 性能豫測에 關한 硏究

김문헌,권영필,신치웅 崇田大學校 1981 論文集 Vol.11 No.1

The objective of this paper is to simulate the performance of H₂O-LiBr absorption refrigerator. The thermodynamic cycle of the H₂O-LiBr simple effect absorption refrigeration is analyzed and the coefficient of performance is derived for an ideal cycle. Equation for thermodynamic properties of LiBr solution and water are obtained by the least square method from equilibrium charts. And a computer program is developed, which can calculate the circulation ratic and the coefficient of performance from the efficiency of the heat exchanger and temperatures of generator, condenser, evaporator and absorber. The simulation of the performance by the computer shows the following characteristics. When the efficiency of the heat exhcnanger increase, the COP volue increases and the operating range is reduced by recry stallization. When the generator temperature increase, the COP value increases at a high condensor temperature but decrease at a low condenser temperature. However the COP value always increases as the condenser temperature decreases. It is more effective for high COP value to decrease the condenser temperature than to increase the generator temperature.

초고층 건축물의 경제성 증진을 위한 사례 연구

김영학,한범석,안종문,신성우 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)

An economic analysis is one of the most important factor to determine the project feasibility. In some mega projects, however, it is not unique factor to make a Go or No-Go decision because of overriding an economic aspect by some project indirect factors such as political, social, environmental, and technical factors, etc. The purpose of this study is to investigate the economical effects of supertall buildings through application of optimum structural system and materials. Analytical results shows that economical effects of RC structures used high strength concrete in supertall buildings can be achieved.

곡선 전개를 이용한 형태 추출

김성곤,신문걸,김두영 東亞大學校 附設 情報通信硏究所 1998 情報通信硏究所論文誌 Vol.6 No.1

Shape modeling is an important part of computer vision. Shape models help the tasks of object representation and recognition. In this paper, curve evolution and level set algorithms are used for extracting a shape within an image. This method is based on the ideas developed by Osher and Sethian to model propagating solid/liquid interfaces moving with curvature-dependent speeds. We propose the new generalized formulation and stopping function of evolution for more accurate extraction of shape. Our method canbe applied to model arbitrarily complex shapes and has the ability to dynamically sense the topological changes of the shape during the shape recovery process.

환경농업 시범마을 논에서 시비에 따른 무척추동물 개체 수 변화

한민수,신중두,나영은,이남종,박문희,김세근 한국환경농학회 2002 한국환경농학회지 Vol.21 No.2

논의 관리방법에 따른 수서생물상의 변동 양상을 파악하기 위하여 종합적인 환경농업기술 시범 2개 지역의 논 및 하천에서 주기적으로 조사 분석하였다. 논에서의 수서 무척추동물의 총 개체 수는 두 지역 모두 농가관행구에 비해 화학비료 토양검정 시비구에서 62% 이상 높았고 그 다음은 두 지역에서 서로 다르게 나타나 옥천의 경우 농가관행구, 양평은 화학비료+개량재 순으로 많고, 가장 적은 처리는 무비구였다. 수서곤충의 총 개체 수는 토양검정시비구가 농가관행구 옥천 및 양평 각각 328, 45.1/L보다 56%, 69% 더 많았다. 갑각류의 총 개체수는 옥천 지역에서는 토양검정 화학비료구> 화학 비료+개량제구> 농가관행구> 무비구 순으로 많았으며, 양평에서는 화학비료+개량제구>토양검정 화학비료>무비> 농가관행구 순으로서 과다 비료시용구인 농가관행구에서 가장 적었다. 두 지역의 논관류 하천에서 서식하는 수서 무척추동물은 59과 76종이 분류되었고, 미확인종이 14종으로 조사되었으며, 특히 물방개과 중 노란테 콩알 물방개 및 땅콩 콩알 물방개가 채집되었고 양평 지역에서는 날도래 종류가 다양하게 서식하고 있는 것으로 나타났다. 하천지류별 수서 무척추동물 서식밀도는 두 지역 모두에서 상류보다는 하류에서 밀도가 높았으며, 옥천의 연평균 성적에서도 하류에서 1300/0.09 ㎡로 최상류에 비해 172% 더 많은 밀도를 나타냈다. 친환경 농업 실천 2개 지역에서의 논 서식 수서 무척추동물 개체 수 조사 결과 일반관행 농가 논 91.1/L 보다 58% 더 많았다. This study was conducted to survey and identify kinds and population of the freshwater invertebrate fauna according to the managements of paddy rice fields at Ok-Chun and Yang-Pyung. The experiment was conducted in 4 paddy plots; conventional fertilization plot (CF), fertilization by prescription with soil testing with (ST+A) or without soil amendment (ST), and no fertilization as the control. In addition, the freshwater invertebrate fauna was also surveyed at 3 sections of as upper, intermediate and down, in both Jitan and Bungsan stream. The total number of the freshwater invertebrates was higher in the order of ST>CF>ST+A>C and ST>ST+A>CF>C at Ok-Chun and Yang-Pyung, respectively. The population density of aquatic insects was higher in plots fertilized by prescription with soid testing than in the other plots at both demonstration villages. The freshwater invertebrates collected in Jitan and Bungsan stream were identified and classified into 59 families and 90 species, and their population density was highest in the downstream among.