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외부증착공정에서의 열영동에 의한 입자부착에 관한 3차원 해석
홍기혁,강신형,Hong, Gi-Hyeok,Gang, Sin-Hyeong 대한기계학회 1997 大韓機械學會論文集B Vol.21 No.3
Three-dimensional conjugate heat transfer and particle deposition on a circular cylinder in the OVD process are numerically investigated. Flow and temperature fields are obtained by an iterative method, and thermophoretic particle deposition is simulated. Effects of the heat conduction in the cylinder, the rotation speed of the cylinder, and the traversing speed of torch on the deposition are studied. Effects of variable properties are also included. As the conductivity of the cylinder decreases, particle deposition rate and deposition efficiency greatly decrease due to the reduced temperature gradient. The rotation of the cylinder has no significant effect on the deposition due to the small diameter of the cylinder and low speed of rotation. Since the increase of the torch speed keeps the surface low temperature, the particle deposition increases with the traversing speed.
어린이전용수영장 시설 안전관리에 관한 법·제도적 고찰과 운영 실태
홍기혁,박재우,김주용 한국체육정책학회 2021 한국체육정책학회지 Vol.19 No.2
The purpose of this study is to analyze the act and system and operational status on safety management of kids swimming pool facilities, which have rapidly grown into private sports facilities, and the actual conditions of facilities and operations. To achieve these research objectives, this study established four research problems and collected data through literature reviews, fact-finding surveys through quasi-participatory observations, and in-depth interviews to identify them. The results of the study are as follows. First, it was found that small private sport facilities such as kids swimming pools were very vulnerable to restrictions on application standards and regulations compared to public sport facilities. Second, the kids swimming pools are managed by establishing its own operating manual and system, while the relevant laws and regulations of the government and the departments are insufficient. Third, it was confirmed that there were no detailed laws, systems or regulations on facilities for safety management as a result of investigating the actual condition of facilities of the kids swimming pools. In terms of the management of facilities, it was confirmed that the kids swimming pools are self-organizing the relevant manual and that the facilities are also managed and maintained by themselves. Fourth, it is suggested that it needs to draw institutional attention of the government and local governments in order to supplement and improve legal and policy regulations on Facility and operational safety. It is necessary to establish an efficient management system for the kids swimming pools through the implementation of new systems such as evaluation and certification system.
균일 층류유동중에 있는 원형 실린더 주위의 열영동에 의한 입자 부착
홍기혁,강신형,Hong, Gi-Hyeok,Gang, Sin-Hyeong 대한기계학회 1996 大韓機械學會論文集B Vol.20 No.2
Thermophoretic particle deposition on a circular cylinder in a uniform laminar air flow was numerically investigated using a control volume method based on the generalized non-orthogonal coordinate system. Variation of air properties due to the change of temperature was taken into account. Effects of variable property on the distribution of heat transfer and deposition rates of particle were discussed. A new correlation of thermophoretic particle deposition on a circular cylinder was proposed in the present study.
비균일 벽면 온도가 원형 실린더에 충돌하는 고온 제트 유동 및 열전달에 미치는 영향
홍기혁,강신형,Hong, Gi-Hyeok,Gang, Sin-Hyeong 대한기계학회 1997 大韓機械學會論文集B Vol.21 No.7
A buoyant jet flow impinging on a circular cylinder is investigated including heat conduction through the cylinder. Temperature and flow fields are obtained by an iterative method, and the effects of the non-uniform wall temperature on the flow and heat transfer are analyzed. Effects of three-dimensionality and the traversing of the jet are also included. Nusselt number over the cylinder surface for the conjugate case is relatively small as compared with the constant wall temperature case due to the small temperature gradient. As the conductivity of the cylinder becomes lower, Nusselt number decreases due to the reduced temperature gradient. Increasing jet traversing speed causes the surface temperature of the cylinder to decrease, which increases local Nusselt number over the surface.
말기 암성 통증 제거를 위한 Totally Implanted Port System (Periplant system)
홍기혁 인제대학교 1991 仁濟醫學 Vol.12 No.4
경막 외강내로 카테타를 삽입한 후 그 일부를 몸 밖으로 빼내어 이 입구로 Opioids를 투여하던 기존의 방법은 감염, 카테타 빠짐, 거동 불편 등의 단점이 있었으나, 카테타 끝을 Port에 연결하여 피하조직에 거치시킨 후 봉합함으로서 기존에 사용하던 방법의 단점을 줄일 수 있었다. Spinal opioids have dramatically changed the way to manage the acute and chronic pain of obstetrical malignant origin. The development of various implantable narcotic delivery systems has complimented and facillitated the growth of this treatment modality. By appropriate patient selection with the unique advantages and disadvantages of each of the six types of implantable narcotic delivery systems, improved results both in terms of pain relief and patient satisfaction can be achieved.