• 한국컴퓨터정보학회논문지
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• 제26권4호
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• pp.55-62
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• 2021

본 논문에서는 사용자의 관심영역(Region of interests, ROI)을 마찰력 기반의 스크롤을 통해 데이터를 빠르고 효율적으로 검색할 수 있는 인간-콘텐츠 사이의 새로운 인터페이스를 제안한다. 사용자가 관심이 있는 정보나 콘텐츠를 찾는 행동에서 착안한 우리의 접근 방식은 주어진 콘텐츠에서 ROI를 효율적으로 계산하고, GMM(Gaussian mixture model, 가우시안 혼합 모델)에서 착안해 개발한 커널을 기반으로 사용자가 관심 있어 하는 정보의 위치로 부드럽고 빠르게 화면을 이동시켜 정보를 탐색한다. 본 논문에서는 선형 보간법(Linear interpolation)을 적용하여 한층 부드러운 하나의 관성을 만들고, 이것을 스크롤에 적용한다. 결과적으로 사용자의 입력에 따라 정보가 검색되는 기존의 접근법과는 달리, ROI와 DOI(Degree of interests, 중요도)를 기반으로 마찰력을 제어한다. 제어된 마찰력 기반 스크롤을 통해 사용자가 관심 있어 하는 정보나 콘텐츠를 보다 쉽고 직관적으로 찾아줄 수 있기 때문에 사용자는 탐색 시간을 절약할 수 있다.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 1999년도 춘계학술대회논문집
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• pp.119-124
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• 1999

Quantitative evaluation of the tribological conditions at the tool-workpiece interface in metal forming is usually accomplished by the ring-compressinon. test This paper describes an experimental investigation into shear friction factor under cold and hot forming conditions according to materials and lubricants using the ring compression test. Six different materials and five different lubricants were applied in the experiments. calibration curves with the friction coefficient were obtained using FEM analysis and verified by the verified by the experimental results. The influence of materials and lubricants level on friction are discussed. In the ring compression test the shear friction factor has a different from steels and aluminum water base graphite lubricants on cold working conditions and hot working conditions.

• 한국해양공학회:학술대회논문집
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• 한국해양공학회 2000년도 추계학술대회 논문집
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• pp.12-19
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• 2000

In this paper, not only the development of optimizing of friction welding with more reliability and more applicability but also development of in-process real-time weld quality(such as strength and toughness) evaluation technique by acoustic emission for friction welding of the engine exhaustive valve(SUH3-SUH35 dissimilar steels of 12.3mm, 16mm, 20mm and 24mm in diameters) were performed, comparing with the other FRW matches of materials such as SUH3 to SUH31, SUH3 to STS303 and SUH3 to STS304. As an important result, the techniques for dissimilar friction welding optimization of engine heat resisting steels SUH3 and SUH35( 12.3mm, 16mm, 20mm, 24mm) and its real-time weld quality evaluation by AE were developed, considering on both diameter and carbon equivalent effects.

• 한국해양공학회:학술대회논문집
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• 한국해양공학회 2000년도 추계학술대회 논문집
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• pp.42-46
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• 2000

In this paper, joints of Cu-1Cr-0.1Zr alloy to STS316L were performed by friction welding method. Cu-1Cr-0.1Zr alloy is attractive candidate as nuclear power plant material and exibit the best combination of high sts good electrical and thermal conductivity of any copper alloy examined. The stainless steel is a structural material who alloy acts as a heat sink material for the surface heat flux in the first wall. So, in this paper, not only the develop optimizing of friction welding with more reliability and more applicabililty but also the development of in-process rear quility(such as strength and toughness) evaluation technique by acoustic emission for friction welding of such nuclear component of Cu-1Cr-0.1Zr alloy to STS316L steel were performed.

• 한국생산제조학회지
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• 제7권2호
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• pp.47-53
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• 1998

In this study, behavior of deformation and mechanical properties under static tensile load in friction welded dissimilar materials. and necking phenomenon occuring at yeilding point are shown. Behavior of Hv(Micro Vickers Hardness) is observed that the maximum value is occured near by the interface. and the minimum value is arised at the heat affected zone. Fracture occured at the minimu value of Hv of the heat affected zone is observed. The position of fracture surface is subjected to behavior of Hv. Yielding strength subjected to friction welding conditions, specially to upset pressure is shown.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2004년도 추계학술대회논문집
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• pp.301-304
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• 2004

Friction welding was used to weld the turbine wheel and shaft and have a good welding quality. Friction welding was conducted an the two dissimilar material, Nimonic 80A and SNCrW. The control of friction welding process parameter such as flywheel energy, interface temperature, amount of upset have an effect on the mechanical properties of the welded joint. FE simulation can be a useful tool to optimize the weld geometry and process parameters. Flash shape and thickness weld is consistent with the simulated results. Process analysis was performed by the commercial code DEFORM 2D. Mechanical property of weld joints was evaluated by microstructure, chemical component, tensile, impact, hardness test so on.

• Tribology and Lubricants
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• 제18권2호
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• pp.109-116
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• 2002

phase lubrication can be used as an alterative lubrication method to overcome the demerits of liquid and solid lubrications. In this work, the tribological characteristics of metals are investigated under vapor phase lubrication. It was found that the friction coefficient and wear volume can be controlled efficiently by the amount of vapor phase lubricant delivered to the sliding interface. The friction coefficient could be reduced to about 0.1 under vapor lubrication. Also, depending on the amount of vapor lubrication delivered to the system, the width of the wear track could be varied between 50 to 250 Um. It is shown that vapor phase lubrication mechanism is very effective to control the friction and wear phenomena without the use of excessive oil.

• 한국해양공학회:학술대회논문집
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• 한국해양공학회 2001년도 춘계학술대회 논문집
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• pp.282-288
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• 2001

This paper deals with determining the proper friction welding condition and analyzing various mechanical properties of friction welded joints of the bladepart heat resisting steel(STD11) for cold die punch to the shank part alloy steel(SCM440). And the in-process real-time weld quality evaluation technique by acoustic emission during friction welding of STD11 to SCM440 steels with higher confidence and reliability has been much required even though it might be the first trial approach for developing it. Also, the high temperature properties of STD11-SCM440 weld were considered in this paper.

• 한국해양공학회지
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• 제15권2호
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• pp.79-87
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• 2001

In this paper, not only the development of optimizing of friction welding with more reliability and more applicability but also the development of in-process real-time weld quality (such as strength and toughness) evaluation technique by acoustic emission for friction welding of the engine exhaustive valve (SUH3-SUH35 dissimilar steels of 12.3mm, 16mm, 20mm, and 24mm in diameters) were performed, comparing with the other FRW matches of materials such as SUH3 to SUH31, STS303 and SUH3 to STS304. As an important result, the techniques for dissimilar friction welding optimization of engine heat resisting steels SUH3 and SUH35 (12.3mm, 16mm, 20mm, and 24mm) and its real-time weld quality evaluation by AE was developed, considering on both diameter and carbon equivalent effects.

• 한국해양공학회지
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• 제10권2호
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• pp.69-76
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• 1996

In-process quality control and high reliability of the weld are the major concerns in applying friction welding to the economical and qualified mass-production. Experimental examinations and quantitative analysis were performed for the optimiaztion of similar friction welding of hydraulic valve spool steels(SNCM220, SCM435, SACM645, SCM415, ${\varphi}24). The quantitative correlations were found between the initial cumulative counts of acoustic emission(AE) occurring during plastic deformation periods of the welding and the fatigue life as well as weld strength and welding conditions. A real-time evaluation system was developed for the friction weld quality by AE.