• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2005년도 춘계 학술발표회 논문집
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• pp.1023-1030
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• 2005

This study is an experiment paper about the ground improvement material which using the waste residual(slag and paper fly ash) by fire. we are research to concern according to the soil to mix the ground improvement material at show strength effectiveness. Also, we can expect a long time strength increase effectiveness as reduce the dryness contraction. They are distinguished to the clay of the reclamation ground and silty sand soil. We examined around an uniaxial compress test and scanning electron microscopy. The uniaxial stress increases according to the increase of the mixed ratio of ground improvement material and the water contents have been reduced the strength value. A clay's improvement effectiveness is big but in the silty sand soil to express small effectiveness. A ground improvement material mixing of the quantity to write can not expect the effect of Ettringite.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2004년도 춘계학술발표회
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• pp.692-697
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• 2004

This study is on the increasement of strength about soft ground improvement material using waste residual(paper fly ash, coke ash, slag) by fire. Through this study the authors have analyzed the strength improvement of mixed soft silty sand with improvement materials. The strength of mixed soils with high mixture ratio and more curing days increased. But CA-30(cokes 60%) make more low strength improvement than others. Therefore the authors find out that paper fly ash+cokes, paper fly ash+slag or cokes+slag improvement material is more effect in improvement of soft silty sand than cokes+cenlent. And Ettringite reaction is free mixed soils with more than two materials.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2010년도 하계학술대회 논문집
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• pp.364-364
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• 2010

In the electricity control field, a relay is the most widely used electrical switch. But it has problems about a material transfer phenomenon, contact bounce, and the mechanical life. These Problems cause the serious problem in a facility. So, we tried to solve these problems by applying MOSFET electronic switch and could find good improvement compared to conventional electrical switch.

• 산업경영시스템학회지
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• 제43권2호
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• pp.65-71
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• 2020

Worldwide plant market keeps maintaining steady growth rate and along with this trend, domestic plant market and its contractors also maintain such growing tendency. However, in spite of its external growth, win-win growth of domestic material industry that occupies the biggest share in plant industry cost portion is extremely marginal in reality. Domestic plant material suppliers are required to increase awareness of domestic material brand by securing quality and reliability of international standard through improvement of design quality superior to that of overseas material suppliers. Improvement of design quality of plant material becomes an essential element, not an option, for survival of domestic plant industry and its suppliers. Under this background, in this study, priority and importance by each evaluation index was analyzed by materializing plant design stage through survey of experts and defining evaluation index by each design stage and based on this analysis result, evaluation index of stage-gate based decision-making process that may improve design quality of plant material was suggested. It is considered that by utilizing evaluation index of stage-gate based decision-making process being suggested in this study, effective and efficient decision-making of project decision-makers would be enabled and it would be contributory to improve design quality of plant material.

• 한국지반환경공학회 논문집
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• 제14권8호
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• pp.5-9
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• 2013

본 연구에서는 저에너지, 친환경적인 방법의 지반개량을 목적으로 하는 유기산재의 지반개량재로서의 강도특성을 모색하였다. 이에 유기산재를 활용하여 재령 28일까지의 일축압축강도시험 및 삼축압축시험을 통한 흙의 강도 변화에 대해 분석하였다. 유기산 재료를 첨가한 점토의 강도는 재령이 길어질수록, 유기산재 혼합비가 커질수록 전반적으로 증가하는 경향을 나타내었다. 유기산계 지반개량재 혼합에 따른 점토의 강도 증진 효과를 파악하는데 있어서, 일축압축강도시험과 삼축압축시험 결과를 통해 유기산재가 지반개량재로 쓰였을 때 가져오는 강도 증대효과가 있다는 것을 알 수 있었다. 결과적으로, 실내시험을 통해 지반개량에 있어 유기산계 지반개량재의 활용가능성을 볼 수 있었다. 향후 세부적인 시험과 현장시험이 좀 더 명확한 강도증진을 규명하는데 도움이 될 것으로 판단된다.

• 한국자동차공학회논문집
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• 제12권1호
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• pp.196-202
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• 2004

The development of new materials with light weight and high strength has become vital to the machinery, aircraft and auto industries. However, there are a lot of problems with developing such materials that require expensive tools, and a great deal of time and effort. Therefore, the improvement of fatigue strength and fatigue life are mainly focused on adopting residual stress(in this thesis). The compressive residual stress was imposed on the surface according to each shot velocity(57, 70, 83, 96 m/sec) based on Shot-peening, which is the method of improving fatigue life and strength. By using the methods mentioned above, the following conclusions have been drawn. 1. The fatigue crack growth rate(da/dN) of the Shot-peened material was lower than that of the Un-peened material. And in stage I, ΔKth, the threshold stress intensity factor, of the shot-peen processed material is high in critical parts unlike the Un-peened material. Also m, fatigue crack growth exponent and number of cycle of the Shot-peened material was higher than that of the Un-peened material. That is concluded from effect of da/dN. 2. Fatigue life shows more improvement in the Shot-peened material than in the Un-peened material. And compressive residual stress of surface on the Shot-peen processed operate resistance force of fatigue crack propagation.

• 한국콘텐츠학회논문지
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• 제10권10호
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• pp.429-439
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• 2010

본 연구의 목적은 전자구매시스템의 도입을 통해 구매성과기대에 미치는 영향을 파악하고자 하는 것이다. 선행연구의 고찰을 통해 다음의 가설이 설정되었다. H1 : 근무호텔의 특성(호텔등급, 객실 수, 경영형태, 직원 수)에 따라 전자구매시스템도입에 대한 필요성지각에는 차이가 있을 것이다; H2 : 전자구매 시스템 도입에 대한 필요성 지각은 식자재, 음자재, 객실소모성 및 청소용품, 시설 관련 일반자재 구매에 대한 성과 기대에 유의한 영향을 미칠 것이다; H2-1, H2-1, H2-3, H2-4 : 전자구매 시스템 도입에 대한 필요성 지각이 식자재, 음자재, 객실소모성 및 청소용품, 시설 관련 일반자재 구매성과기대에 미치는 영향에 있어서 직급과 직무는 조절변수역할을 할 것이다. 결과적으로 전자구매시스템도입에 대한 필요성 지각은 구매기대성과에 비례하는 것으로 나타났으며, 직급과 직무의 조절변수역할에 대한 검증은 부분채택 되었다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2001년도 하계학술대회 논문집
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• pp.515-518
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• 2001

In this study, the electric door lock using the password input system for security improvement was fabricated. The security has been improved by using the multiple micro process. The controller with solenoid valve has been designed indirect driving system for releasing the door lock system. Also, the self checkup system for improving the trustworthy was developed with two kinds of micro process. The results will be applied IC card system and fingerprint identification system for security improvement.

• 센서학회지
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• 제18권3호
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• pp.217-221
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• 2009

Different methods of material engineering, used for improvement of solid state gas sensors parameters are reviewed in this report. The wide possibilities of material engineering in optimization of gas sensing properties were demonstrated on the example of $SnO_2,\;TiO_2\;and\;In_2O_3$-based sensors.

• 한국지하수토양환경학회지:지하수토양환경
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• 제14권3호
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• pp.47-56
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• 2009

본 연구는 해안점토 또는 육상의 사질토에 지반개량재를 혼합하였을 때 어떤 강도변화를 보이는지에 관한 것이다. 철광석을 제련할 때 부산물인 슬래그와 제지류 소각할 때 생기는 paper fly ash를 일정한 비율로 혼합하여 지반개량재를 만들었다. 이러한 지반개량재를 해안점토와 육상의 사질토에 혼합한 후 함수비, 양생일, 혼합비 등으로 구분하여 일축압축강도 시험용 공시체를 제작하였다. 공시체가 28일간 양생되는 동안 일축압축강도의 변화와 생성물질의 변화를 분석하였다. 강도분석 결과 육상의 사질토보다 해안점토에서 최대 11배 정도의 강도증가의 효과가 나타났는데, 이는 지반개량재로 인한 ettringite 반응이 사질토보다 해안점토에서 명확하게 보여주는 것을 의미한다.