의료 진단용 압력 센서

윤의식(尹義植) 대한전기학회 1998 전기의 세계 Vol.47 No.1

산화물환원에 의한 W-15wt%Cu 나노복합분말의 합성과 특성

윤의식 한국분말야금학회 1997 한국분말야금학회지 Vol.4 No.4

The synthesis of W-l5wt%Cu nanocomposite powder by hydrogen reduction of ball milled W-Cu oxide mixture was investigated in terms of powder characteristics such as particle size, mixing homogeneity and micropore structure. It is found that the micropores in the ball milled oxide (2-50 nm in size) act as an effective removal path of water vapor, followed by the formation of dry atmosphere at reaction zone. Such thermodynamic condition enhances the nucleation of W phase but suppresses the growth process, being in favor of the formation of W nanoparticles (about 21 nm in size). In addition, the superior mixing homogeneity of starting oxide mixture turned out to Play a significant role for forming extraordinary chemical homogeneity of W-l5wt%Cu nanocomposite powder.

금융 물류 BPR에 대한 연구 : 농협물류를 중심으로

윤의식,신유균,이종성,유춘회,강경식 대한안전경영과학회 2008 대한안전경영과학회지 Vol.10 No.1

LD TO CAN의 전기 광학적 특성 측정에 의한 TO CAN Package 공정의 안정성 조사 ( Evaluation of TO CAN Package Process's Stability by Measuring CW Electrooptical Properties of LD TO CAN )

윤의식,전흥준,고한준,최민호,신기철,박인식 한국통신학회 1998 한국통신학회 기타 간행물 Vol.- No.-

계획적 배송에 TMS적용을 통한 온실가스 배출 저감 방안에 대한 연구

윤의식,이순곤 한국SCM학회 2010 한국SCM학회지 Vol.10 No.1

Developed countries have resolved for the best steps(measures) dealing with global warming at the COP3 which is under discussion on taking effective actions against global warming. The Kyoto Protocol(Kyoto Protocol to the United Nations Framework Convention on Climate Change) was carried out as of Feb sixteenth, 2005, Its principal points are setting reduced goals with binding force in developed countries, new introduction of ways to cut down the greenhouse gas and attaining the goal which is to diminish greenhouse gas with allied countries There are subjects of reduction that have been CO2, CH4, N2O, HFCs, HFCs, SF6, and so on. The part of transport is especially asked for diminishing CO2. This is connected with efficiency of backup logistic. The industry of the logistics has achieved a rapid growth in South Korea. Even if the logistic costs in Korea's enterprises account for 9.9%, the figure is below the level 7.1% of US, 5.1% of Japan. To revise and make up for it from aspects of stated above the environmental problems and cost -cutting, we will curtail distribution costs and improve the quality which meets the needs of clients. In consequence we try to contribute much for retarding global warming through diminished CO2. We will make a suggestion how logistic industry should proceed by introducing TMS which has been improved in the field. From this research, we make a model of TMS that has been issued in this field of logistic system at H company and look into the effects of TMS. Moreover we try to check CO2 emissions according to current routes and compare with how far the company has an effect after applying to TMS.

고강도 강섬유보강 콘크리트의 역학적 특성 및 장기변형 특성에 관한 실험적 연구

윤의식,박승범 대한토목학회 2006 대한토목학회논문집 A Vol.26 No.2A

This study presents basic information on the mechanical properties and long-term deformations of high-strength steel fiber reinforced concrete(HSFRC). The Influence of steel fiber on modulus of elasticity, compressive, splitting tensile and flexural strength, and drying shrinkage and creep of HSFRC are investigated, and flexural fracture toughness is evaluated. Test results show that Test results show that the effect of steel fibers on the compressive strength is negligible, and the modulus of elasticity of HSFRC increased with the increase of fiber volume fraction. And the effect of fiber volume fraction(Vf) and aspect ratio(lf/df) on tensile strength, flexural strength and toughness is extremely prominent. It is observed that the flexural deflection corresponded to ultimate load increased with the increase of Vf and lf/df, and due to fiber arresting cracking, the shape of the descending branch of load-deflection tends towards gently. Also, the effect of addition of various amounts of fiber on the creep and shrinkage is obvious. Especially, the effect of adding fibers to high-strength concrete is more pronounced in reducing the drying shrinkage than the creep. 본 연구에서는 고강도 강섬유보강 콘크리트(HSFRC)의 설계 및 시공을 위한 기초 자료를 제공하기 위하여 역학적 특성 및 장기변형 특성에 관한 연구를 수행하였으며, 탄성계수, 압축강도, 인장강도, 휨강도, 건조수축 및 크리프에 미치는 강섬유 혼입의 영향을 검토하고, 휨파괴인성을 평가하였다. 연구결과, HSFRC의 압축강도에 미치는 강섬유의 혼입효과는 그다지 크지 않았고, 탄성계수는 섬유혼입률이 증가함에 따라 증가하는 것으로 나타났으며, 인장강도, 휨강도 및 휨인성에 미치는 섬유혼입률(Vf) 및 섬유형상비(lf/df)의 영향은 대단히 큰 것으로 나타났다. 이는 Vf 및 lf/df,의 증가와 함께 극한하중에 상응하는 처짐량이 증가하고, 강섬유의 균열구속성능에 의해 하중-처짐곡선의 하강곡선이 완만하게 감소하기 때문인 것으로 판단된다. 또한 크리프 및 건조수축에 미치는 섬유혼입률(Vf)의 영향은 대단히 큰 것으로 나타났으며, 특히 고강도 콘크리트에 강섬유를 혼입하면 크리프 변형에 비해 건조수축 변형의 저감에 더욱 효과가 큰 것으로 나타났다.

금속사출성형한 W-Cu 나노복합분말의 소결거동

윤의식,유지훈,이재성 한국분말야금학회 1997 한국분말야금학회 학술대회논문집 Vol.1997 No.1

초고속 data 전송을 위한 세라믹 기본의 stem을 이용한 새로운 형태의 TO package

윤의식,주필연,이명진,정지채 한국통신학회 2002 한국통신학회 기타 간행물 Vol.2002 No.10

분말사출성형한 W-l5wt%Cu 나노복합분말의 초기소결거동

윤의식,유지훈,이재성 한국분말야금학회 1998 한국분말야금학회지 Vol.5 No.4

The initial sintering behaviour of the powder injection molded (PIMed) W-l5wt%Cu nanocomposite powder was investigated. The W-Cu nanocomposite powder was produced by the mechanochemical process consisting of high energy ball-milling and hydrogen reduction of W blue powder-CuO mixture. Solid state sintering of the powder compacts was conducted at $1050^{\circ}C$ for 2~10 hours in hydrogen at mosphere. The sintering behaviour was examined and discussed in terms of microstructural developments such as W-Cu aggregate formation, pore size distribution and W grain growth. The volume shrinkage of PIM specimen was slightly larger than that of PM(conventional PM specimen), being due to fast local densification in the PIM. Remarkable decrease of carbon and oxygen in the PIM enhanced local densification in the early stage of solid state sintering process with eliminating very fine pores less than 10 nm. In addition, such local densiflcation in the PIM is presumably responsible for mitigating of W-grain growth in the initial stage.

분말사출성형한 W-Cu 나노복합분말의 치밀화와 가스방출

윤의식,유지훈,이재성 한국분말야금학회 1999 한국분말야금학회 학술대회논문집 Vol.1999 No.1