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.

근로자의 최적 위험분산을 위한 원금보장형 우리사주제도(ESOP) 설계 방안

김형태(Hyoung Tae Kim),송홍선(Hong Sun Song),이효섭(Hyo Seob Lee) 한국증권학회 2013 한국증권학회지 Vol.42 No.1

우리사주제도(ESOP)는 근로자로 하여금 자기회사주식을 유리한 조건으로 매입해 보유토록 함으로써 근로의욕을 고취시키고, 보유주식의 가치 상승시 이를 향유하게 함으로써 재산형성에 도움을 주는 제도로 널리 활용되고 있다. 그러나 기업이 도산위험에 처할 경우, 우리사주에 투자한 근로자는 임금채권을 회수하지 못할 뿐 아니라, 우리사주 투자로부터 손실을 볼 수 있는 이중위험에 노출될 수 있다. 주가의 변동성이 높은 한국과 같은 시장에서, 이 같은 주가하락으로 인한 손실위험은 우리사주제도의 활성화를 가로막는 가장 큰 문제점으로 지적되어 왔다. 본 연구에서는 근로자의 이중위험을 분산시키고 안정적인 재산형성에 기여할 수 있는 원금보장형 우리사주제도를 제안하였다. 평균-분산 기대효용(mean-variance expected utility) 모형을 기초로, 원금보장형 우리 사주제도를 활용할 경우 근로자의 효용이 크게 증가함을 보였다. 더불어, 도덕적 해이 문제를 고려하여 근로자에게 최적 효용을 제공하는 원금보장형 우리사주제도 구조를 제시하였다. An employee stock ownership plan (ESOP) allows employees to purchase and hold shares in the company at favorable conditions. ESOPs are popular because they offer incentives to work, and the profit from a higher stock price helps employees accumulate savings. But problems arise when the company is in danger of bankruptcy. In this case, employees can be exposed to dual risks; they may not be able to recover unpaid wages, and stock ownership will incur investment losses. In the volatile Korean stock market, the potential losses from stock price declines are pointed as the biggest obstacle to ESOPs being used more widely. As an alternative, this study proposes a principal-protected ESOP which spreads the dual risks and helps employees save money more stably. Based on the mean-variance expected utility model, we show that the principal-protected ESOP significantly increases utility for employees. We also present a desirable principal-protected ESOP structure that takes into account moral hazard to provide optimal utility to employees. Considering the cost increases from moral hazard because of the principal protection structure, an ESOP that has partial principal protection and distributes some investment returns to the ESOP provider (financial firm) is found to provide the highest expected utility to employees. We hope the results of this study will contribute to a more incentive- compatible ESOP system and provide fresh policy implications for Korea``s ESOP development.

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.

特異 分布方式 에 의한 非定常水中翼問題 의 解析

金炯太(Hyoung-Tae Kim),李昶燮(Chang-Sup Lee) 대한조선학회 1983 大韓造船學會誌 Vol.20 No.3

목회적 교육의 관점에서 본 한국의 기독교교육에 대한 평가

김형태(Hyoung Tae Kim) 한국기독교교육학회 2006 기독교교육논총 Vol.13 No.-

이 논문의 주제는 목회적 교육의 관점에서 본 한국의 기독교교육에 대한 평가이다. 이 연구의 목적은 한국의 기독교교육이 한국교회에 대한 바른 교육적 평가를 통해 건강한 한국교회의 성장을 도울 수 있게 하자는 것이다. 이를 위한 연구의 절차로 먼저 기독교교육 실천의 4차원인, 1) 교육의 표준-성서, 2) 교육의 시설-교회, 3)교육의 효과-그리스도인의 인격변화, 4) 교육의 목적-하나님의 나라의 삶을 선정하고, 이것들을 다음과 같은 이 연구의 가설로 설정한다. 일반적 가설: 기독교교육의 기본목적은 하나님의 나라의 삶이며, 이를 위한 기독교교육의 당면 목표는 예수 그리스도께서 바라는 인격의 변화를 돌보기 위한 한 신앙적 결단이다. 가설의 연역된 결과: 1. 예수 그리스도께서 바라는 인격의 변화는 기독교의 성서에 계시되어 있다. 2. 예수 그리스도께서 바라는 인격의 변화는 교회 안에서 돌봐지는 신앙적 결단이다. 3. 예수 그리스도께서 바라는 인격의 변화는 개인과 그의 관련된 공동체를 변화시킨다. 4. 예수 그리스도께서 바라는 인격의 변화는 삶의 화해와 평화와 일치를 성장시킨다. 이상의 연구 가설들을 긍정하기 위해서 성서와 관계 문헌들을 연구한다. 그리고 가설 검증의 신뢰도와 타당도는 연구자의 다년간에 걸친 목회적 교육 경험과 연구실적이 뒷받침한 주관적 평가로 대신다. The problem of this study consisted of four elements:(1) Christian educational standard­Bile; (2) Christian educational institution­church; (3) Christian educational effectiveness­personality change; (4) Christian educational purpose­the eternal salvation of God. This four elements set up the following four hypotheses:(1) Christian personality change is revealed in the Bible; (2) Christian personality change is an faithful commitment in the care of the Church; (3) Christian personality change reflects on his or her related community life changes; (4) Christian personality change grows an reconciliation, peace, and unity in the community life. The scop of this study is delimited to the Presbyterian Church of Korea, and the period of the Republic of Korea since 1945. The four hypotheses were tested subjectively, and failed to be well supported. The first, Christian education in Korea has not been well fulfilled the Christian personality change in accordance with what Jesus Christ wanted in the Bible. The second, Christian education in Korea has not been well confirmed to be a faithful commitment to Christ in the care of the church. Because there is no such pastoral education in which church minister should take a double role of pastor and teacher. The third, Christian education in Korea has not been well effective on his or her related community life changes. The Korean church has been failed to reflect her healing power on the secular social culture. The fourth, Christian education in Korea has not been well done to realize the eternal salvation of God on the Korean peninsula and to grow a reconciliation, peace, and unity among the Korean people.

새터민 청소년의 심리적응에 영향을 미치는 가족관련 요인

김형태 ( Hyoung Tae Kim ) 한국가족관계학회 2008 한국가족관계학회지 Vol.13 No.1

반도체 클린룸용 배기 열회수식 에어와셔 시스템의 에너지 소비량 실험

김형태(Hyoung-Tae Kim),송근수(Gen-Soo Song),유경훈(Kyung-Hoon Yoo),손승우(Seung-Woo Son),강신영(Shin-young Kang),권오명(Oh-Myung Kwon) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5

In the present study, an experiment was conducted to investigate saturation efficiencies of air washer, the energy consumption and heat recovery efficiencies for fin-coil type air washer systems. In recent semiconductor manufacturing clean rooms, the energy consumption of outdoor air conditioning systems represents about 45 % of the total air conditioning load required to maintain a clean room environment. Meanwhile, there is a large amount of exhaust air from a clean room. From an energy conservation point of view, heat recovery is therefore useful for reducing the outdoor air conditioning load for a clean room. In the present work, an energy-efficient outdoor air conditioning system was proposed to reduce the outdoor air conditioning load by utilizing an air washer to recover heat from the exhaust air. The proposed outdoor air conditioning system consisted mainly of a preheating coil, an air washer, two stage cooling coils, a reheating coil, a humidifier and two heat recovery cooling coils inserted into the air washer and connected to a wet scrubber.

전략적 협업방법론 고찰 : 모바일 산업 사례연구

김형태(Hyoung tae Kim) 한국산업경영시스템학회 2015 한국산업경영시스템학회지 Vol.38 No.1

In this paper, even though there exist various problems to be solved in SCM field, we focus on problems arising from demand- supply discrepancy and introduce the concept of CPFR (Collaboration Planning Forecasting and Replenishment) as one solution for outstanding problems. Furthermore, by presenting a real CPFR project case between the S Company and V Company, we try to help potential benefactors of CPFR in two aspects : 1) how to implement CPFR, and 2) what they can expect from CPFR.