경계면이 움직이는 채널에서 2 차원 droplet 변형에 대한 연구

김형락(Hyung Rak Kim),윤현식(Hyun Sik Yoon),정해권(Hae Kwon Jeong),하만영(Man Yeong Ha) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11

다상유동의 시뮬레이션 기법으로 lattice Boltzmann method(LBM)을 이용하였다.일정한 속도로 움직이는 2 차원 채널에서 비 혼합 액적이 변형하는 현상을 모사하고 접촉각, 경계면의 속도, 액적의 크기 변화에 따라서 액적의 거동을 연구하였다. 초기 액적의 접촉각은 초기조건으로서 액적이 완전히 형성된 후 경계면을 일정한 방향으로 움직였다. 접촉각, 경계면의 속도, 액적의 크기에 따라서 액적은 경계면에 붙어서 이동하는 경우, 액적이 분리되는 경우, 액적이 경계면에서는 뜨게 되는 경우의 3 가지 형태로 분류가 가능하다. A two-dimensional immiscible droplet deformation phenomena on moving wall in a channel has been simulated using lattice Boltzmann method. The behavior of the droplet is shown with the effects of the contact angle, the velocity of bottom wall, droplet size of the droplet to the displacement fluid are investigated. At the initial state, a droplet with various contact angle between the bottom wall is formatted on the wall in a quiescent fluid. When the bottom moves, the shape of droplet starts to deform. The three patterns of deformation of the droplet corresponding to the contact have been shown in the present study.

주 40시간 근무제의 도입이 근로시간, 임금 및 고용에 미치는 영향

김형락 ( Hyung Rak Kim ),이정민 ( Jung Min Lee ) 한국노동경제학회 2012 勞動經濟論集 Vol.35 No.3

본 연구는 2004년부터 점진적으로 실시된 주40시간 근무제, 이른바 주``5일 근무제``의 도입이 근로시간, 임금 및 고용에 미친 효과를 「고용형태별근로실태조산」 원자료를 이용하여 추정하였다. 법정 근로시간 단축이 연도별·산업별 및 사업체 규모별로 단계적으로 적용되었던 점에 착안하여 삼중차감 모형을 사용하였다. 희귀분석 결과, 주 40시간 근무제의 도입으로 실제 근로 시간은 약 43분 단축되었고, 시간당 임금은 약 6.6% 상승한 것으로 나타났으나 신규 고용은 약 2.3%포인트 하락시킨 것으로 나타났다. This paper estimates the impacts of introducing the 40 hour work week standard in South Korea on actual working hours, wages and employment. We exploit variation in timing of implementing the 40 hour work week standard across industries and establishment size and estimate the causal effects by a triple difference model. Our results show that the 40 hour work week standard decreased actual working hours by about 43 minutes while it increased hourly wage rate by 6.6%. The probability of new hires decreased by about 2.3% points.

성찬신학의 기호학적 이해

김형락(Hyung Rak Kim) 한국기독교학회 2014 한국기독교신학논총 Vol.91 No.-

This paper deals with the Eucharistic meaning making process how the recipients signify the Eucharistic meal as the body and blood of Christ. This research aims at exploring the epistemological transformation process of the Eucharist meal (the bread and wine) into the symbol of the body and blood of Christ. For this research, both Charles Sanders Peirce`s semiotics and Graham Hughes Eucharistic theology, which present the meaning?making process especially for the non?textual signs, (symbol) are used as the research methodologies to explain the epistemological transformation progress of the Holy Communion meal as the symbol of the body and blood of Christ. In addition, I explore the Eucharistic theology of Edward Schillebeeckx who asserts a similar Eucharistic semiotic structure as an example to understand the symbolic transformation of the bread and wine. Then, I gave some practical suggestions for the ministers to preside more effective the Eucharist in the local churches. Finally, I summarize and conclude whole research in the last section.

된장 섭취에 의한 Helicobacter pylori의 생장 억제

김형락(Hyung Rak Kim),김영휴(Young Hyu Kim),박성찬(Seong Chan Park),김미선(Mi Sun Kim),백근식(Keun Sik Baik),조현욱(Hyun Wook Cho),성치남(Chi Nam Seong) 한국생명과학회 2007 생명과학회지 Vol.17 No.12

본 연구의 목표는 발효식품인 된장의 섭취가 Helicobacter pylori에 의한 감염의 억제에 효과가 있음을 확인하는데 있다. 된장 추출물과 된장으로부터 분리된 균이 H. pylori의 생장을 억제시키는지 여부를 표준균주인 H. pylori ATCC 26695와 위 궤양 환자의 조직으로부터 분리한 H. pylori 균주를 대상으로 실시하였다. 된장 추출물과 된장으로부터 분리된 대부분의 세균은 H. pylori의 생장을 억제하였다. 된장의 섭취효과를 측정하기 위해 무자각 증상의 H. pylori 보균자를 대상으로 <SUP>13</SUP>C-요소호기검사법을 실시하였으며, H. pylori 감염 농도는 Δ<SUP>13</SUP>C (T₁-T?) 값(P)으로 판정하였다. 1일 30 g (10 g×3회)씩 6주간 섭취한 지원자들의 섭취 전·후의 P값은 58에서 28로 감소하여 H. pylori의 밀도가 낮아졌음을 입증하였다. 즉, 된장이 위 점막에서 H. pylori의 생장을 억제하는 것을 확인하였다. The aim of this study was to estimate the ingestion effect of fermented soybean paste on the growth inhibition of Helicobacter pylori. Anti-H. pylori effect of the aqueous extract of soybean paste and cell-free supernatant of the isolates from soybean paste were determined using agar diffusion method. Soybean paste and the isolates inhibited the growth of H. pylori. Effect of soybean paste ingestion was estimated using urea breath test against infected volunteers showing no symptom of gastric disease. When 10 g of soybean paste was ingested 3 times a day for 6 weeks, average value of P= Δ<SUP>13</SUP>C (T₁- T?) decreased from P=58 to P=28. This result indicated that fermented soybean paste was effective to inhibit the growth of H. pylori in gastric tissue.

이머징 위쉽, 현대 한국 기독교의 대안적 예배가 될 수 있는가?

김형락 ( Hyung Rak Kim ) 서울신학대학교 기독교신학연구소 2010 神學과 宣敎 Vol.37 No.-

열 유동 해석을 고려한 굴삭기 엔진룸 배치 기여도 분석

김형락(Hyung Rak Kim),서영민(Young Min Seo),하만영(Man Yeong Ha) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.열공학 No.-

실천신학 : 예배 전쟁을 넘어 존 웨슬리의 예전적 예배를 향하여

김형락 ( Hyung Rak Kim ) 서울신학대학교 기독교신학연구소 2014 神學과 宣敎 Vol.45 No.-

In the late twentieth century, the term, worship wars has emerged in the North American Christian churches. The worship war means that the conflict between two different worship traditions, which are Hypolitus tradition and Willow Creek tradition. Hypolitus tradition represents the historical liturgical tradition originated from the third century Christian liturgy, while Willow Creek tradition is a contemporary style worship that has emerged in the late twentieth century for the seekers and the younger generation. This conflict between these two worship traditions has become a serious issue in not only the North American Christian churches but also the Korean Christian churches. I probed the two Christian worship traditions, liturgy and worship comparing the differences of two traditions, advantages and disadvantages of each tradition. Then, I explained some reasons why the Korean Protestant Churches should include the liturgical tradition more. To explain the reasons, I presents the relationship between the liturgy (worship) and theology in light of three mainline Christian traditions such as the Orthodox tradition, Roman Catholic tradition, and Protestant tradition. Then, I give an example worship tradition that tries to keep balance between liturgical tradition and worship tradition, the liturgical worship of John Wesley. Through this research, I have arrived a strong conviction that the liturgical worship that John Wesley tried to combine the elements of liturgy and worship is the solution of the worship wars emerged in the contemporary Christian churches.

열 유동 해석을 고려한 엔진룸 배치 최적화에 대한 연구

김형락(Hyung-Rak Kim),하만영(Man-Yeong Ha),서영민(Young-Min Seo),이재석(Jae-Seok Lee),황주호(Ju-Ho Hwang) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12

Recently, temperature of the engine room has been increased due to the high performance engine. Efficient and durable design of the cooling system is essential. In this paper, we considered the effect of distance between fan and heat exchangers, gap of shroud tip and the exhaust-port of substructure. Based on the results, the best cooling system of the layout for an excavator is selected. Finally, the criterion to select the best cooling system has been set up.

바닥면이 움직이는 이차원 채널 내 액적의 특성 연구

김형락(Hyung-Rak Kim),윤형식(Hyun-Sik Yoon),정해권(Hae-Kwon Jeong),하만영(Man-Yeong Ha) 대한설비공학회 2011 설비공학 논문집 Vol.23 No.2

A two-dimensional immiscible droplet deformation phenomena on moving wall in a channel has been investigated by using lattice Boltzmann method involving two-phase model. The dependence of the deformation of the droplet with different sizes on the contact angle and the velocity of bottom wall has studied. When the bottom wall starts to move, the deformation of the droplet occurs. For the largest bottom wall velocity, eventually, the deformation of the droplet is classified into the three patterns according to the contact angle.

대역폭 확장 특성을 갖는 주파수 Reconfigurable 슬롯 안테나

이우성,김형락,윤영중,Lee Woo-Sung,Kim Hyung-Rak,Yoon Young-Joong 한국전자파학회 2006 한국전자파학회논문지 Vol.17 No.6

본 논문에서는 기존의 주파수 reconfigurable 안테나의 협대역 특성을 개선하기 위한 대역폭 확장 특성을 가지는 주파수 reconfigurable 슬롯 안테나가 제안되었다. 제안된 안테나는 주파수 reconfigurable 특성을 가지는 동시에 대역폭을 확장시키기 위하여 넓은 슬롯 및 좁은 슬롯 두 부분으로 구성되어 있다. 삼각형 구조의 넓은 슬롯은 제안된 안테나의 대역폭을 증가시키는 역할을 하며, 좁은 슬롯은 PIN diode를 장착하는 역할을 한다. 제안된 안테나는 PM diode의 동작 상태를 바꿈에 따라 슬롯의 총 길이를 변화시키며, 이로 인해 중심 주파수 조절과 임피던스 정합의 변화를 최소화시킨다. In this paper, a frequency reconfigurable slot antenna which has a bandwidth-enhanced characteristic is proposed. The proposed antenna consists of two parts; the wide slot and the narrow slot, to increase the bandwidth of the antenna and have the frequency reconfigurable characteristic. The wide slot has triangular shape and makes the bandwidth increased, and the narrow slot can mount PIN diodes. By changing on/off state of PIN diodes, the total length of the slot is changed. From this characteristic, the proposed antenna can finally control the center frequency and minimize variation of the impedance matching.