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사종엽,허준성 嶺南大學校 工業技術硏究所 1998 工業技術硏究所論文集 Vol.26 No.2
Two-phase flows of two immiscible fluids have many difficulties to determine exact solutions due to the movement of interface while they are common physical phynomena in nature. In the VOF(Volume of Fluid) method, the volume fraction of fluid is introduced to monitor the interface motion. The conservation equations for the field variables are solved by using an advection scheme on an arbitrary Lagrangian-Eulerian mesh. The advection scheme takes a weighted combination of the upwind and downwind fluxes. The fluid interface are traced by tracking the sharp variations of the volume fraction. A code for analysis of 2-dimensional fluid flow with free surface is developed. This code is composed of pre-processor, solver and post-processor. The pre-processor is for mesh generation and setting boundary conditions and initial conditions and the flows are calculated with VOF-FCT method in the solver. The post-processor visualize the solution. this code is programmed with GUT(Graphic User Interface)in Windows95.
박정향,사종엽 嶺南大學校 工業技術硏究所 2002 工業技術硏究所論文集 Vol.30 No.2
The surface modeller has been developed for designing efficiently the reflector shape of headlamps. The surface and curves has been represented by using NURBS (Non-Uniform Rational B-Splines). IGES format has been supported for data exchange among other 3D CAD systems such as CATIA. The triangular surface mesh generation has been mounted on the surface modeller for other simulation and design. The OOP (Object-Oriented Programming) technique has been used completely for all of above-mentioned modules, such as NURBS representation, surface modeller, IGES support, triangulation of surface mesh, and GUI (Graphic User Interface). The actual reflectors designed on CATIA has been tested and imported successfully into the present program.
Jung-Youb Lee,Jung-Won Kim,Eun-Jung Kim,Mi-Young Lee,Chang-Wook Nam,In-Sung Chung 대한직업환경의학회 2018 대한직업환경의학회지 Vol.30 No.-
Background: The concentration of particulate matter in the air varies depending on the region because it is lightweight and generated from a variety of sources. To assess the relationship between particulate matter and eye disease, this study analyzes the concentration data obtained from spatial analysis of particulate matter and emergency visit data. Methods: The study included 769 residents of Daegu, Korea who had visited an emergency room for the problem of conjunctivitis or keratitis. Concentrations of PM10 and other air pollutants were obtained from the Korean Ministry of the Environment. PM10 concentrations and the number of patients from each of 143 administrative dongs (sub-municipal level administrative units) of the city of Daegu were obtained using spatial analysis. The patient distribution and PM10 concentration were mapped for comparison, and their relationship was examined using scatter plot, regression analysis, and the independent sample t-test. Results: The number of patients with conjunctivitis and keratitis was significantly higher in the regions of the top 20% areas than the bottom 20% areas in terms of PM10 concentration. The distribution of PM10 concentration and number of patients was visually similar on the map. The concentration of PM10 and the number of patients showed a dose–response relationship. When the concentrations of other air polluta9nts were controlled for, the numbers of conjunctivitis and keratitis patients were 0.04 per 1000 ER patients and 0.10 per 1000 ER patients, respectively. Conclusion: As PM10 is associated with the prevalence of conjunctivitis and keratitis, measures to reduce particulate matter through environmental methods are needed.
Lee, Jung-Youb,Leigh, Seung-Bok,Kim, Taeyeon,Cho, Sooyoun Architectural Institute of Japan 2015 JOURNAL OF ASIAN ARCHITECTURE AND BUILDING ENGINEE Vol.14 No.3
<P> There is a growing interest in sustainable design in the building industry to reduce energy consumption and minimize adverse environmental impacts of buildings. The strategies for sustainable design are as follows: 1) reducing the size of the building's equipment system and saving energy through an optimal design; 2) maximizing natural energy use through a passive solar heating system; and 3) utilizing an active system through applications of high-performance heating, ventilation, and air conditioning (HVAC) and lighting systems, installation of new and renewable energy facilities, and so on. It is vital to evaluate and compare the energy efficiencies of design alternatives at an early design stage, and hence, to improve the energy performance of the final building, as design elements determined at an early phase in the architectural design process greatly influence the energy performance of the building itself. Further, costs increase over time with the number of design changes made. In the course of this research, the KLT (Korean lighting and thermal energy) method was revised and developed based on the lighting and thermal energy (LT) method, adjusting for South Korea's climate and architectural regulations, which can be used to assess the energy performance of buildings. This study was conducted to determine the process of selecting optimal design alternatives to maximize building energy performance at an early stage in the process. </P>
최정도(Jung-Do Choi),이주엽(Ju-Youb Lee),강수훈(Jung-Do Choi),박진희(Ju-Youb Lee),신동석(Su-Hoon Kang) 한국컴퓨터정보학회 2009 한국컴퓨터정보학회 학술발표논문집 Vol.16 No.2
현재 홈 네트워크 환경은 각 디바이스들을 위한 독립적인 서비스 보다 모든 디바이스를 통합관리 지원하는 지능적인 홈 오토메이션 서비스로 발전하고 있다. 이에 본 논문에서는 사용자의 신원확인만으로 댁내의 모든 디바이스들을 사용자 개인의 특성에 맞게 자동 제어할 수 있는 지능형 홈 오토메이션 시스템을 제안한다. 등록된 사용자의 정의된 규칙을 이용하여 가정내의 모든 디바이스들을 자동 제어한 수 있는 조건기반엔진을 설계하여 모든 디바이스를 독립적으로 제어하는 방식을 보완함으로써 지능적인 서비스를 사용자에게 제공할 수 있다.
The Influence of Dielectric Constant on Ionic and Non-polar Interactions
Hwang, Kae-Jung,Nam, Ky-Youb,Kim, Jung-Sup,Cho, Kwang-Hwi,Kong, Seong-Gon,No, Kyoung-Tai Korean Chemical Society 2003 Bulletin of the Korean Chemical Society Vol.24 No.1
This work is focused on analyzing ion-pair interactions and showing the effect of solvent induced inter-atomic attractions in various dielectric environments. To estimate the stability of ion-pairs, SCI-PCM ab initio MO calculations were carried out. We show that the solvent-induced attraction or ‘cavitation' energy of the ion-pair interactions in solution that arises mainly from the stabilization of the water molecules by the generation of an electrostatic field. In fact, even the strong electrostatic interaction characteristic of ion-pair interactions in the gas phase cannot overcome the destabilization or reorganization of the water molecules around solute cavities that arise from cancellation of the electrostatic field. The solvent environment, possibly supplemented by some specific solvent molecules, may help place the solute molecule in a cavity whose surroundings are characterized by an infinite polarizable dielectric medium. This behavior suggests that hydrophobic residues at a protein surface could easily contact the side chains of other nearby residues through the solvent environment, instead of by direct intra-molecular interactions.