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Selection of Valve Clearance Using MLA Tappet for Valvetrain Rig
Sunki Min,Bongjo Kim,Hongjoo Kim 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
MLA system is used to reduce cost and friction. But MLA system doesn't have the ability of controlling of clearance between MLA and valve not as HLA. In case of MLA the clearance becomes nearly zero as the engine warmed-up. The valve motion is usually studied at valvetrain rig for convenience. But the temperature of test head at rig is much lower than real engine. So there is a difference between rig test result and real valve motion at engine. In this study the effect of MLA clearance was studied. From maximum clearance to zero clearance, 5 sorts of MLA were tested. From the lift and velocity graph of closing region the seating velocity and bouncing height was studied. Also the effect of warming-up on clearance was studied.
Estimation of Thermal Aging Embrittlement of LWR Primary Pressure Boundary Components
Kim, Sunki,Kim, Yongsoo Korean Nuclear Society 1998 Nuclear Engineering and Technology Vol.30 No.6
Cast duplex stainless steels are extensively used for primary pressure boundary components. These components are, however, embrittled due to the precipitation of $\alpha$' phase by spinodal decomposition and other processes when exposed to reactor operating temperature for a design lifetime or life extension conditions. This report presents a procedure for estimating the current condition and the residual life of safety-related stainless steel components by using ANL database and correlations. The database of Charpy impact energy suggests that CF-8M grade is the most susceptible to thermal aging and CF-3 grade is the least. Thus, the integrity of CF-8M alleys may be degraded seriously and the degree of deterioration may exceed acceptance limit after several years of service in the nuclear reactors.
인간 로봇 상호작용을 위한 Disparity 정보를 이용한 동작 인식
김순기(Sunki Kim),김대진(Daijin Kim) 한국정보과학회 2008 한국정보과학회 학술발표논문집 Vol.35 No.2
제스처는 음성을 대체할 수 있는 가장 강력한 의사소통 수단이다. 본 논문에서는 제스처 인식을 통해 인간과 컴퓨터 사이의 상호적용(HCI)이 가능한 방법을 제안하였다. 사람의 제스처를 판단하기 위하여 시간 정보를 이용하여 사람의 움직임을 누적 하고 중첩하는 MHI (Motion History Image)와 MEI (Motion Energy Image)의 방법을 이용한다. 또한 배경 변화에 강인한 제스처 인식이 가능하도록 3차원 좌표 정보를 이용한다. 먼저 AdaBoost 방법을 이용하여 사람의 얼굴을 검출한 후 사람 얼굴 영역의 Z축 좌표 값의 평균을 구한다. 사람 얼굴 영역 Z축 평균값을 이용하여 카메라에서부터 사람 얼굴보다 가까운 일점 3차원 영역을 잘라내어 제스처 영역으로 정의한다. 제스처 영역은 카메라와 사람 얼굴 사이의 공간이므로 제스처 인식 도중 배경의 변화나 조명의 변화에 강인한 특징을 가진다. 제스처 분류기는 인공 신경망을 이용하였다.
Chung, Sunki,Shin, Dongyoon,Choun, Myounghoon,Kim, Jungsuk,Yang, Seugran,Choi, Mihwa,Kim, Jin Won,Lee, Jaeyoung The Electrochemical Society 2018 ECS Transactions Vol.85 No.13
<P>Water management in the cathode is one of the most significant issues in proton exchange membrane fuel cells, especially for long-term stability and dynamic operation in fuel cell vehicles. Therefore, it is critical to design a water-managed/well-fueled cathode layer to overcome significant mass transfer limitations and the corrosion of the carbon support in fuel cells. In this work, we report a simple modification method of the Pt/C cathode using highly graphitized carbon nanofibers for improved water management. This study may open up new possibilities for water management and will be helpful for developing high performing proton exchange membrane fuel cell.</P>
金善祺(Kim Sunki) 한국언어문학회 2006 한국언어문학 Vol.59 No.-
This study aims to examine the relationship between Pahanjip, the first Korean book about poems and their related stories and Bohanjip, which was published 40 years later. The main focus of this study is the extensive and augmentative relationship between two books. There were two main reasons to publish Bohanjip. One was the insufficiency of Pahanjip itself, and the other was the demand which the writer of Bohanjip and people around him realized to supplement Pahanjip.<BR> As a result of the study, Pahanjip was excessively oriented toward Lee Inro’s personal achievements and his view points about literature. Those were recognized as negative factors by other writers. The leading figure who criticized Lee Inro was Choi Wu, who was the ruler of the times. The writer of Bohanjip was Choi Ja. In comparison to Pahanjip, there existed a will to extend and develop the contents of Pahanjip in Bohanjip.<BR> In extension parts, the quantity and areas of data were expanded. In addition, criticism became more various, and objectivity increased. Bohanjip contains contents which were compiled and evaluated more carefully than Pahanjip. Lee Inro’s rhetorical device which quoted famous old writers’ writing was replaced by Originality Theory. Lee Inro’s place as the head of literary circles was replaced by Lee Gyubo. The efforts to extend the old book and develop it into the new one made a significant contribution to early Korean poetry books.