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A17075-T6 시편의 절삭이송속도와 쇼트피닝 유무에 따른 피로수명 연구
김형태,신기훈,Kim, Hyoung-Tae,Shin, Ki-Hoon 한국생산제조학회 2007 한국생산제조학회지 Vol.16 No.4
This paper presents a study on the effects of feedrate and shotpeening on the fatigue life of A17075-T6 specimens. For this purpose, six groups of specimens, each of which consists of eight specimens, were first machined at six different feedrates(0.05, 0.10, 0.15, 0.20, 0.25, 0.30mm/rev). Half of eight specimens in each group were then peened and the others remained un-peened. Then, the fatigue life was measured by using 4-point rotatry bending machine. One observation was that the fast the feedrate was, the large the diameter of a specimen was. To make sure that the bending stress was the same in all cases, different loading conditions were thus applied to specimens based on their diameters. Next, comparison of fatigue life among twelve sets of specimens(six groups times two sets, peened and un-peened) was performed. Finally, based on machining cost analysis, a guideline for optimal feedrate was presented.
PIV Measurement of Velocity Profile in the 1/8 Scale CANDU6 Moderator Circulation Test
김형태,서한,차재은,방인철,Kim, Hyoung Tae,Seo, Han,Chan, Jae Eun,Bang, In Cheol The Korean Society of Visualization 2014 한국가시화정보학회지 Vol.12 No.1
The Korea Atomic Energy Research Institute (KAERI) has a scaled-down moderator test program to simulate the CANDU6 moderator circulation phenomena during steady state operation and accident conditions. In the present work a preliminary experiment using a 1/8 scaled-down moderator tank has been performed to identify the potential problems of the flow visualization and measurement in the scaled-down moderator test facility. With a transparent moderator tank model, a velocity field is measured with a Particle Image Velocimetry (PIV) technique under an isothermal state. The flow patterns from the inlet nozzles to the top region of the tank are investigated using PIV for a 1/8 scale moderator tank.
특이점분포방식(特異點分布方式)에 의한 비정상수중익문제(非正常水中翼問題)의 해석(解析) -제2보(第2報) 3차원(次元) 문제(問題)로의 확장(擴張)-
김형태,이창섭,Hyoung-Tae,Kim,Chang-Sup,Lee 대한조선학회 1983 大韓造船學會誌 Vol.20 No.3
In this paper a discrete-vortex-method(DVM) is presented for investigating the hydromechanics of the planar hydrofoils performing the undulatory motion which can be related to fish propulsion with carangiform mode. This is an extention of the authors previous work(1981) on the 2-dimensional hydrofoil. The applicability and accuracy of the present method are shown by means of comparing the calculated lifts and moments, and their distributions over the planforms with those in available references, for aspect ratio 1.0 and 2.0 rectangular hydrofoils and a swept-back hydrofoil of aspect ratio 2.0 from reduced frequency 0.1 to 0.5. The agreement is considered good. To assure the applicability of the DVM to the study of the propulsive performance of the oscillating planar hydrofoils, the convergence tests are performed. The mean thrust(in pure heave, this is wholly due to leading-edge suction), the mean power to maintain the motion and the hydromechanical efficiency are calculated for the rectangular hydrofoil of aspect ratio 8.0 and these are compared with the calculations by Chopra & Kambe(1977) and Lan(1979) for the same cases.
삼차신경통의 치료를 위한 삼차신경절 풍선압박술의 마취관리 -증례보고
김형태 ( Hyung Tae Kim ),안선경 ( Seon Kyeong An ),장인수 ( In Su Jang ),김형일 ( Hyoung Ihl Kim ) 대한마취과학회 2009 Korean Journal of Anesthesiology Vol.57 No.1
Trigeminal neuralgia is sudden, usually unilateral, severe brief stabbing recurrent pain in the distribution of one or more branches of the 5th cranial nerve. Treatments of trigeminal neuralgia include systemic trials of medications and surgical procedures such as microvascular decompression, stereotactic radiosurgery, percutaneous glycerol or alcohol rhizolysis, percutaneous radiofrequency rhizotomy, and percutaneous balloon compression (PBC). PBC of the trigeminal ganglion using a balloon catheter was introduced by Mullan and Lichtor in 1983. Since then, many papers have been published describing results of this technique. Typically, this procedure is performed under general anesthesia. However, little is known about the use of PBC for the treatment of trigeminal neuralgia in Korea. We report here our anesthetic management of percutaneous balloon compression of trigeminal ganglion for the treatment of the trigeminal neuralgia by total intravenous anesthesia. (Korean J Anesthesiol 2009; 57: 132~6)
CFX Simulation of a CS28-2 Experiment
Hyoung Tae Kim(김형태),Bo Wook Rhee(리보욱),Joo Hwan Park(박주환) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
A computational fluid dynamics (CFD) simulation tool for the CS28-2 high temperature experiment is developed with a CFX-10 software and the results obtained from the simulations are compared with the experimental data. The CS28-2 test is one of the experiments to understand the high-temperature fuel channel behavior and to establish the effectiveness of the moderator as a heat sink to demonstrate the safety of CANDU reactors. The main heat transfer characteristics of the CS28-2 are a super-heated steam convection and a radiation heat transfer from the hot rods to the surrounding cold wall. The CFX-10 predictions of the temperatures of the heater rods and the pressure tube are in good agreement with the measurement data for steady-state conditions.
Appropriate Technology for Supporting the Social Welfare of Local Community
김형태(Hyung-Tae Kim),김형태(Hyoung-Tae Kim),고명순(Myung-Soon Ko) 적정기술학회 2017 적정기술학회지(Journal of Appropriate Technology) Vol.3 No.1
글로벌화 시대인 21세기는 다른 나라와 교류가 없이는 발전해 나갈 수 없게 되었고 정치적, 사회적, 경제적, 문화적 모든 분야에서 급 변화가 이루어지며 국경을 초월한 다국적 기업들을 중심으로 그 활동영역이 무너지고 있는 추세이 다. 그러나 이러한 세계화에 따라 성장되는 강대국들이 있는 반면에 오히려 경제적 종속, 의존성이 심화되어 국제적 경 쟁에 뒤처진 저개발국들이 존재하고 그들 국민의 빈곤은 해결되지 못하는 과제로 남아있게 되었다. 물론 세계 NGO 단 체들을 통한 사회복지의 실천이 계속되어 왔지만 대부분의 구호활동은 단발적 물자공급을 지원하는 것에 그치고 있는 실정이다. 이러한 기부형 원조활동은 경우에 따라 공여국들의 원조재원조달 불안정성, 단발성원조에 대한 수혜국의 반 참여의식 등이 문제점으로 나타나고 있다. 이에 대하여 적정기술은 매우 적합한 실천수단이자 해결책이 될 것으로 판 단되어 본 연구의 동기로 삼고자 한다. 적정기술 활동의 두 가지 특징은 미래 사회복지실천의 매우 효율적인 적합성 을 담보하는 방안이 될 수 있다는 것과 사회복지봉사활동의 실행 효과에 대한 지속성을 가진다는 관점을 중심으로 본 연구를 통해 그 배경과 현황을 파악하고, 저개발국의 기초적인 생활복지 개선사업의 하나인 정수필터 생산기술지원 봉 사 사례를 살펴봄으로 사회복지 실천과 정책의 새로운 방안을 고찰하고자 한다. The 21st century is a global era when no country can not be developed without interchanging with other countries. In this era, everything is changing across political, social, economic and cultural fields, and multinational corporations are working across over specific active region. However, while there are growing powers with globalization, there is a deepening economic subordination of underdeveloped countries with increasing global competitiveness, which leads to unresolved problem of their poverty. While the practice of social welfare through NGO (non-governmental organizations) has continued, most of the relief efforts have remained in support of the provision of one-time supplies. Such donations are attributable to the problem of unstable financial aid funds for donors, and the ungratefulness of donee for one-time assistance. On the contrary, appropriate technology is considered to be a very proper means of practice and a solution to this situation, which would be the objective of this research work. The two characteristics of the appropriate technological activities are like these; to review the feasibility of social welfare practices and to devise a new method of supporting the implementation of social welfare activities. In this study, we’ll try to review the background and current situation of this water treatment and to explore the new means of social welfare actions and policies as an example of basic living practices for welfare improvement in undeveloped countries.