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한원희(Won-Hee Han),최병호(Byoung-Ho Choi) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.4
Hydrogen diffusion is one of critical mechanisms of stress corrosion cracking (SCC) of engineering materials such as carbon steels. Especially, it is known that the degradation of pipe grade carbon steels under fatigue loading conditions is accelerated by hydrogen diffusion steels, but the classical diffusion equation cannot address this specific issue. So, in this paper, the conventional diffusion equation, i.e. Fick's second law, is modified by applying new boundary conditions considering fatigue loading conditions, and the solution is given analytically using Green's function. In addition, some parametric studies are provided by applying some key parameters of the solution, and the results are discussed to understand physical meanings of the final solution.
공간 스케일에 따른 사용자의 증강현실 가구 콘텐츠 배치 유형 특성 분석
한원희(Han, Won-Hee),김주연(Kim, Ju-Yeon) 한국주거학회 2021 한국주거학회 학술대회논문집 Vol.33 No.2
The realm of human life is expanding beyond the real space through the development of media and technology and expanding into virtual and augmented reality fields. In addition, the user does not just experience the planned program in a virtual space, but experiences a world where one creative activity can be accomplished by touching and feeling various contents in it. In particular, augmented reality is attracting attention in terms of usability and usability to create a realistic virtual world by adding virtual content to the real world. Against this background, this study tried to find out what kind of disposition difference in the cognitive aspect when augmented reality contents have different spatial scales. The research method for this is as follows. First, a content placement comparison experiment was planned by examining how augmented reality content is perceived according to its size and the scale at which the difference is conspicuous. Second, 10 kinds of contents in the actual size and 1:20 scaled down size were prepared in the form of furniture and a batch experiment was conducted. Third, the layout characteristics of users at each scale were analyzed. the results are as follow. First, 1:1 scale experiments conducted in real space took a relatively long time compared to 1:20 scale experiments. Second, in the intersecting experiment, the placement type showed a significant difference according to the user’s characteristics and scale. Therefore, the significance of this study can be said to be to utilize the contents of this study as basic data for design design by understanding how content perception and recognition using augmented reality are made and their characteristics in the field of spatial design.
한원희(Han, Won-Hee),김주연(Kim, Ju-Yeon) 대한건축학회 2021 대한건축학회 학술발표대회 논문집 Vol.41 No.1
The H&B store is a space where users" visual perception experience is emphasized. Various types of shelves are used as visual strategies for efficient display and presentation. A behavioral analysis experiment was conducted to study the correlation between the user"s choice of movement and the visual-perceptual characteristics of spatial elements. In the selected H&B space, the areas were divided according to the difference in openness, which is a visual perception characteristic that shows a remarkable difference. Through the analysis of the movement line, the relationship between the user"s spatial exploration behavior and spatial factors was identified. The result is as follows. When checking the frequency of visits by users and 5 areas according to the difference in openness in the space, it was confirmed that the frequency decreased in the order of the areas with high openness and low levels. This study is meaningful in proposing one research method to understand the relationship between openness and movement selection, one of the characteristics of visual perception.
한원희(Han, Won-Hee),정예림(Jung, Yea-Rim),유광헌(Yoo, Gwang-Hun),최진경(Choi, Jin-Kyung),김주연(Kim, Ju-Yeon),박규령(Park, Gyu-Ryung) 대한건축학회 2022 대한건축학회 학술발표대회 논문집 Vol.42 No.2
The Community Service Center is a space operated by a change of name from the Community Center since 2016 to provide more efficient administrative services and to provide better services to residents through an administrative system with expanded welfare functions. However, despite changes in the name and direction of work, the space itself is using the old buildings without any significant changes. These space problems not only cause aging problems such as heating and cooling, parking, and elevators, but also limit improvement in terms of providing fundamental civil complaints and welfare services. In addition, it is said that they feel a lot of inconvenience, especially when the movement of users is difficult, along with the furniture arrangement that does not take into account the residents usage patterns and the difficult and complicated signs to read. As such, although residents requests for maintenance of administrative welfare centers continue to increase, research on user-centered behavioral analysis is still insufficient. Therefore, in this study intends to diversify improvement measures through the analysis of user behavior and usage evaluation in the Community Service Center and to be used as basic data for spatial planning.
보로노이 셀을 이용한 2차원 비등방성 폼 구조 모델링 및 탄소성 압축변형 해석
한원희(Won-Hee Han),최병호(Byoung-Ho Choi),김일현(Ilhyun Kim),이정무(Jeong-Moo Lee) Korean Society for Precision Engineering 2012 한국정밀공학회지 Vol.29 No.7
Foam structure is usually hard to model due to the complexity of the geometry of cells. So, many simplified models to represent complicated foam structures have been proposed, but most of them are not actually describe the random feature of the cell structure well. So, in this study, two dimensional isotropic and anisotropic closed cell structures of the foam were modeled using the concept of Voronoi cells. The elasto-plastic deformation behavior under compressive loads was investigated by finitie element analysis, and the results were compared with ideal honeycomb structure. In addition, the effect of anisotropy of Voronoi cell structures of the foam on Young’s modulus and yield stress under compressive loads was studied.