파인블랭킹 공정 시 클리어런스 및 V링 형상의 영향에 관한 연구

김형락,박종연,김형종 江原大學校 産業技術硏究所 2004 産業技術硏究 Vol.24 No.A

Fine blanking can be considered as a manufacturing process capable of producing sheet metal parts with completely smooth edges that may be hardly obtained by conventional shear-cutting procedures. This fact, together with the considerable economic advantages offered by this process, has been responsible for the rapid acceptance of fine blanking throughout the manufacturing industry all over the world, and the discovery of many new applications. This study was performed to investigate the effect of clearance and V-ring shape on the quality of sheared surface in a fine blanking process. The critical value needed to apply the normalized Cockcroft-Latham fracture criterion to the simulation of fine blanking is obtained by correlating the result of finite element analysis and that of experiment for the uniaxial tensile test. From finite element analysis of an axisymmetric fine blanking process. It has been found that punch load, die-roll depth, burnish zone size and shape of sheared surface are considerably influenced by clearance and V-ring shape.

차세대 무선 통신 시스템을 위한 안테나 신기술

김형락,권세웅,황광선,윤영중 延世大學校 電波通信共同硏究所 2002 電波通信論文誌 Vol.6 No.1

차세대 통신 시스템에서 공통적으로 요구하는 소형화, 광대역화, 집적화추세에 따라 RF소자는 광대역화, 소형화, 집적화를 향해 발전하고 있으며 안테나 기술도 현재 추세에 발맞추어 소형화, 능동집적화, 광대역화를 통하여 개발 방향을 모색하고 있다. 본고에서는 현재 추세인 소형 안테나, 능동 안테나와 더불어 최근 관심이 집중되고 있는 임펄스 통신에 이용될 수 있는 초광대역 안테나 기술에 대해 소개한다. The technical trends of the next generation wireless communication are miniaturization, broad-band operation, and integration. Thus, in accordance with this trend, RF devices and components are being developed in such way, and same with the antenna. In this paper, technology of small antenna, active antenna, and ultra wideband antenna, which can be applied to impulse communication system, are introduced.

四君子湯에서 甘草의 抗酸化劑로서의 役割

김형환,조수인,이용태,김인락 대한본초학회 1999 大韓本草學會誌 Vol.14 No.2

The immune response is dependent on phagocyte function. When this function is deficient or enhanced, the patient is susceptable to a large variety of disease. Enhanced function results in an over active immune response. This study was carried out to investigate whether water extracts of Sijunzi-Tang and Radix Glycyrrhizae have inhibitory effect of neutrophil superoxide generation and cell injury. Superoxide was generated by rabbit polymorphonuclear leukocytes (neutrophils) stimulated by tert-butylhydroperoxide(t-BHP), and was measured by luminol and its detector chemiluminometer. The inhibitory effect of extracts against t-BHP induced superoxide generation was dose-dependent in the range of 0.1~1% concentrations. Cell injury was estimated by measuring lactate dehydrogenase(LDH), and lipid peroxidation was examined by measuring malondialdehyde(MDA), a product of lipid peroxidation. When rat renal cortical slices were treated I mM t-BHP, water decocted herbs inhibited LDH release from the slices as partially dose depecdent manner. It shows that herbs can reduce cytotoxicity, but over dose can be toxic to the slices. And MDA measurement shows the effect of Sijunzi-Tang and Radix Glycyrrhizae inhibiting cytotoxicity from oxidants, partially depend on preventing lipid peroxidation of cells. HPLC data shows the antioxidative effect of Sijunzi-Tang depends on the effect of Radix Glycyrrhizae. So further studies should be followed to make clear the mechanisms of antioxidative effects.

운동 후 발생한 횡문근융해증의 임상정 고찰

김경곤 ( Kyong Gon Kim ),김준형 ( Jun Hyung Kim ),김성민 ( Song Min Kim ),전규락 ( Gyu Rak Chon ),김영욱 ( Young Wook Kim ),이호학 ( Ho Hak Lee ),박상준 ( Sang Joon Park ),김윤권 ( Yun Kwon Kim ),김소연 ( So Yon Kim ),김영중 ( You 대한내과학회 2002 대한내과학회지 Vol.63 No.6

목적: 저자들은 전투 경찰에서 흔히 실시되는 훈련 후 횡문근융해증과의 연관성을 알아보고자 하였다. 방법: 전투경찰 173명을 대상으로 6일간 평균 매일 8시간에 걸쳐 PT체조훈련이 시행하였고,설문조사를 통해 개인당 훈련량을 조사하였다. 결과: 검사 결과 173명 중 98명에서 횡문근융해증을 진단 할 수 있었다. 혈중 마이오글로빈은 훈련량이 증가함에 따라 상승하는 소견을 보였다. 시간 경과에 따른 진행 과정을 볼 때, CPK, AST, 혈중 마이오글로빈은 Background: It is important to recognize rhabdomyolysis in clinical settings, because 10∼30% of rhabdomyolysis patients develop acute renal failure as a complication and patients with such complication have risk of high mortality. Recently, there have bee

Study on physicochemical properties of U3+ in LiCl-KCl eutectic media at 773 K

Kim, Tack-Jin,Jung, Yongju,Shim, Joon-Bo,Kim, Si-Hyung,Paek, Seungwoo,Kim, Kwang-Rak,Ahn, Do-Hee,Lee, Hansoo Springer-Verlag 2011 JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY Vol.287 No.1

Purification and Characterization of Substance P-related Peptide from the Body of the African Lungfish, Protopterus dolloi

Kim, Chan-Hee,Kim, Eun-Jung,Go, Hye-Jin,Lee, Hyung-Ho,Hong, Yong-Ki,Kim, Hyung-Rak,Chung, Joon-Ki,Park, Jang-Su,Muneoka, Yojiro,Park, Nam-Gyu Korean Chemical Society 2006 Bulletin of the Korean Chemical Society Vol.27 No.7

The peptide with structural similarity to mammalian substance P (M-SP) has been isolated from extract of the body of the African lungfish, Protopterus dolloi, using the rectum of the newt as the bioassay system. The primary structure of the SP-related peptide was identified as Lys-Pro-Arg-Pro-Asp-Gln-Phe-Tyr-Gly-Leu-Met-NH2 (L-SP) and contained four substitutions ($Lys^{1}\rightarrow $ Arg, $Arg^{3}\rightarrow$ Lys, $Asp^{5}\rightarrow$ Gln, and $Tyr^{8}\rightarrow$ Phe) compared with M-SP; this structure is identical to that of the peptide isolated from the gut of the Australian lungfish. Circular dichroism spectra showed that L-SP had an unordered structure in the buffer solution and phospholipid bilayers. This peptide was found to have an excitatory effect on rectal muscle tissues of newt, quail, and fish. L-SP also had a more potent vasodilatory effect on the guinea-pig aorta than that of M-SP. The identification of the peptide provides evidence that SP family, hitherto confined to mammals, have a widespread occurrence in lungfish.

Regional Analysis of Soft Tissue Thickness on Korean Buttocks and Application to Fasciocutaneous Flap Design

Kim, Do Yup,Choi, Hyun Nam,Park, Jin Hyung,Kim, Sin Rak,Kim, Hyun,Han, Yea Sik Korean Society of Plastic and Reconstructive Surge 2014 Archives of Plastic Surgery Vol.41 No.2

Background Various shapes and designs of the gluteal artery perforator flap have been used for treating sacral pressure sores and reconstructing breasts. To establish the ideal fasciocutaneous flap design for use in the gluteal area, the soft tissue thickness distribution was measured. Methods Twenty-one buttocks of adult Korean cadavers were analyzed through rectangular subfascial dissection. Each buttock was divided horizontally into 10 sections and vertically into 10 sections, and then, the thickness at the corners of the sections was measured. For the sake of comparison and statistical verification with living bodies, computed tomography (CT) images of 120 buttocks of patients were randomly selected. Five horizontal sections and 4 vertical sections were made, and the thickness at each corner was recorded. Results According to the dissection and the CT images, the area with the thinnest soft tissues in the buttock was around the posterior superior iliac spine, close to the sacral area. The thickest area was the superolateral area of the buttock, which was 3.24 times and 2.15 times thicker than the thinnest area in the studies on cadaver anatomy and the CT images, respectively. Conclusions The thickness of the soft tissues in the buttocks differed by area. The superolateral area had the thickest soft tissues, and the superomedial area had the thinnest. This study includes information on the distribution of the thickness of the gluteal soft tissues of Koreans. The outcome of this study may contribute to the design of effective local flaps for pressure sore reconstruction and free flaps for breast reconstruction.

Lex Credendi to Lex Orandi? - The Eucharistic Sacrifice Controversy in the Sixteenth Century -

Kim, Hyung-Rak 한국실천신학회 2010 신학과 실천 Vol.0 No.25

In the sixteenth century, the controversy of the Eucharistic sacrifice emerged as a result of Luther’ concerns that the doctrine of the Eucharistic sacrifice of the Roman Church was considered even deficient or blasphemous. For the reformers including Luther, this contradiction that existed between the Eucharistic rite and Eucharistic theology was one of the major reasons for the reformers’ opposition to the Roman Church. This liturgical conflict between the reformers and the Roman Church also caused a separation in the way the rituals of the Protestant Eucharistic liturgy and the Roman Catholic Mass were practiced. Succeeding the notion of 'Eucharistic sacrifice' of the Christian leaders of the early Christian church, the medieval Roman Catholic scholars developed this notion as one of the most important Eucharistic theologies as well as the doctrine of Eucharistic change, transubstantiation. This notion, however, misused in practical area unlike its theological area, and theological notion is even related to the corruption of Roman Catholic Mass. Confronting to Roman Catholic Church's misuse of the doctrine of 'Eucharistic sacrifice,' the reformers shaped their own Eucharistic liturgies. Especially, Martin Luther objected the Roman Catholic notion of Eucharistic sacrifice, very severely. The reason for his rejection was that the notion of Eucharistic sacrifice of medieval Roman Catholicism was the theological basis of benefit of grace by God through the Eucharist that church practiced. Luther deleted all kinds of orders in medieval Roman Mass that were related to the notion of Eucharistic sacrifice because it contradicted to Luther's theological slogan of reformation, "Sola Fidei!" This controversy presents an important example that the doctrine (lex credendi) influenced the liturgy (lex orandi) in Protestant tradition.

The Contemporary Liturgical Inculturation Theories : - Focusing on the Theories of Peter C. Phan and Mark R. Francis -

Kim, Hyung Rak 한국실천신학회 2013 신학과 실천 Vol.0 No.37

Since the mid-twentieth century, the Christian churches in the third world have been interested in the inculturation of their liturgies based on their local cultures. In addition, many liturgical scholars have begun to research the methodologies and theologies regarding inculturation between the Christian liturgy and local culture. Among the most prominent figures to be on the cutting-edge of these efforts are Peter C. Phan, and Mark R. Francis distinctive scholars in the field of liturgical inculturation. In this research, I focus on the methodologies for liturgical inculturation formulated by each of those two major figures: Peter C. Phan and Mark R. Francis. Although each of them all asserts the importance of the inculturation of the Christian liturgy, their definitions of “liturgical inculturation” are distinct from one another. In this research, I distinguished each perspectives of the liturgical inculturation, and compared their theological and methodological approaches to the liturgical inculturation, and then rediscovered the new version of definition regarding “liturgical inculturation” in the context of the contemporary Korean Christianity. Through this research, I have reached a strong conviction that In spite of the diverse human conditions, the liturgical inculturation is indispensable for ortho-relationship with God, ortho-faith in God, and ortho-life in the community.

A study on the droplet dynamic behavior on the moving flat plate in the presence of the upper flat tip

Kim, Hyung Rak,Ha, Man Yeong Elsevier 2017 Computers & fluids Vol.156 No.-

<P><B>Abstract</B></P> <P>This study carries out three-dimensional numerical simulation using the lattice Boltzmann method to investigate the dynamic behavior of the water meniscus formed between a moving flat bottom wall and a flat tip surface. The effects of the initial droplet contact angle of the bottom wall and upper tip surface, the moving velocity of the bottom wall on the dynamic behavior of the droplet are considered in this study. Under the influence of these parameters considered, the present results show the change in the shape of droplet as a function of time when the droplet is moving in between the bottom wall and the upper tip surface, and also when the droplet is moving along the bottom wall after the droplet completely escapes from the influence of the upper tip surface. This study also shows the variation of the dynamic contact angle of droplet as well as the dimensionless wet lengths between the droplet and the bottom wall or the flat tip as a function of time.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The droplet that has been maintaining the shape at static state. </LI> <LI> After the influence of the tip, the dynamic contact angle is small. </LI> <LI> The droplet reaches steady state after the droplet escapes. </LI> </UL> </P>