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김홍민,최상철,김광용,김병희,임영택,Kim, Hong-Min,Choi, Sang-Cheol,Kim, Kwang-Yong,Kim, Byung-Hee,Lim, Young-Taek 한국유체기계학회 2003 한국유체기계학회 논문집 Vol.6 No.2
Both numerical and experimental studies on the sedimentation efficiency of a sedimentation bed were carried out. Three different structures of sedimentation bed and five different combinations of blockage ratio of center feed wall and angle of distributor are implemented to find the optimal values of geometric parameters. The effect of rotation of the distributor on sedimentation efficiency is also investigated. It reveals that the effects of blockage ratio and angle of distributor on sedimentation efficiency are considerable, while rotation effect can be neglected, and that calculated efficiencies show good agreements with those of experiment, qualitatively.
난류열전달 향상을 위한 엇갈린 리브가 부착된 열전달면의 형상최적설계
김홍민,김광용,Kim, Hong-Min,Kim, Kwang-Yong 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.9
This study presents a numerical procedure to optimize shape of streamwise periodic ribs mounted on both of the principal walls to enhance turbulent heat transfer in a rectangular channel flow. The response surface method is used as an optimization technique. The optimization is based on Navier-Stokes analysis of flow and heat transfer with $k-{\varepsilon}$ turbulence model. The width-to-height ratio of a rib, rib height-to-channel height ratio and rib pitch to rib height ratio are chosen as design variables. The object function is defined as a function of heat transfer coefficient and friction drag coefficient with weighting factor. Optimum shapes of the rib have been obtained for the range of 0.02 to 0.1 of weighting factor.
코넬 공과대학 기숙사 사례를 통한 대학 기숙사의 패시브 하우스 기술 적용에 관한 연구
김홍민,오형석,류수훈,Kim, Hong-Min,Oh, Hyoung-Seok,Ryu, Soo-Hoon 한국교육시설학회 2018 敎育施設 Vol.25 No.4
Global warming is happening now and inevitable. Everyone knows that immediate action should be taken to slow it down, but uncertain about the effective solution. Despite global efforts to reduce greenhouse gas emissions, sea levels are rising gradually. In 2013, Cornell University announced the Climate Action Plan(CAP) to make the campus greener, to reduce waste, and to ensure efficient use of resources. In particular, they set a goal of reducing energy use by 2050 and making carbon emissions to zero. Accordingly, the purpose of this study is to analyse the case of the master plan of Cornell Tech campus and its major buildings. Mainly, The House, faculty and student housing of Cornell Tech and the world tallest certified passive house, will be the main precedent that shows the architectural planning of passive house. Passive house technology, which was thought to be possible only in single-family houses, can be applied to high-rise buildings. If any passive house technology of The House project is actively introduced into the dormitory projects of domestic universities that are about to be built or renovated, it will be a good opportunity for the university to take the lead in preparing for global warming.
배관구조에 따른 속도분포 변형과 선회가 오리피스 유량계의 압력차에 미치는 영향에 대한 수치적 연구
김홍민,허재영,김광용,Kim, Hong-Min,Kim, Kwang-Yong,Her, Jae-Young 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.10
Three-dimensional pipe flows with elbows, tees and headers in three different pipe systems are calculated to estimate the effect of asymmetry of axial velocity profile and swirl on measuring accuracy of an orifice flowmeter. It is evaluated how the pressure difference across the orifice is dependent on the upstream straight pipe length and how swirl intensity, swirl angle, and axial velocity distribution affect the measuring error of the orifice flowmeter. From the results, it is found that variation of the pressure difference across the orifice is negligible in case that maximum swirl angle is less than 2$^{\circ}$, and also that the pressure difference across the orifice is more sensitive to the asymmetry of axial velocity profile rather than the swirl intensity.
김홍민(Hongmin Kim),진상록(Sangrok Jin),박수민(Sumin Park),김영수(Youngsoo Kim),김종원(Jongwon Kim) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Total Knee Arthroplasty is a surgery of replacing a knee joint with artificial implants. The objectives of the surgery is to restore and correct the lower limb mechanical axis and alleviate pain in the knee joint. Various robotic systems have been proposed to accomplish high accuracy of the alignment of the lower limb mechanical axis and therefore precise cutting of the femur and tibia. These robotic systems for TKA have drawbacks such as increased surgery time and limitation of surgeon’s direct intervention. These drawbacks mainly arises from using the end mill for the cut and adopting an automated scheme of the process. We propose a novel surgical robotic platform that is able to effectively guide the surgeons during TKA. The robotic platform accurately locates the planes of cut and positions the cutting jig. Surgeons use the oscillating saw which they have been using in the conventional surgery, thus the user experiences the familiar force feedback when making the cut, while greatly reducing the load of human resources and surgery time.
원자로 외벽냉각시 원자로공동에서의 자연순환 이상유동에 대한 수치적 연구
김홍민(Hong-Min Kim),서준우(Jun-Woo Seo),김광용(Kwang-Yong Kim),박래준(Rae-Joon Park),하광순(Kwang-Soon Ha),김상백(Sang-Baik Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
This work presents a numerical analysis of two-phase natural circulation flow in reactor cavity under<br/> external vessel cooling. Steady, incompressible, three-dimensional Reynolds-averaged Navier-Stokes<br/> equations for multiphase flows with zero equation turbulence model are solved to predict the shear key effect<br/> on the circulation rate of cooling water and the distribution of void fraction according to the different mass<br/> flow of inlet air. Results show that shear key has a positive effect on the circulation rate of cooling water and<br/> induce a local increase of void fraction below the shear key, but not remarkably.