• 에너지공학
• /
• 제10권3호
• /
• pp.177-182
• /
• 2001

본 연구는 경유승용차(HSDI 경유엔진) 도입에 대해 소비자 측면, 사회적 측면의 경제적 효과를 분석하고자 하였다. 먼저, 생애비용을 고려한 소비자 경제성분석 결과 승용차 수명 10년, 연간 평균 주행거리를 20.000km로 가정할 때 승용차 1대당 연료비 절감액은 13,836천원으로 추정된다. 사회적 편익은 평균 주행거리 20,000km 기준 경유승용차 관매 10% 증가 전제시 휘발유 승용차 대비 2002년부터 이익이 실현되기 시작하여 2010년에 1,541억원의 편익이 발생하는 것으로 추산된다. 사회적 누적편익은 판매량 10% 증가 가정시 20,000km 주행시 2010년까지 6,368억원의 편익이 발생할 것으로 보인다.

• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2005년도 추계 학술논문 발표대회
• /
• pp.25-28
• /
• 2005

This study investigates the field application of surface insulation curing method, which combined double layer bubble sheet(DBS) and thick-curing-material(TCM) for cold weather concreting. According to the test, deck slab, curing only upper section with DBS and TCM, does not make big different temperature history with that, curing both upper and bottom section during daily average temperature 6.5t. It is concluded that combination of DBS and TCM in only upper section can be safely cured in early period of time during cold water concreting. The field test was carried out with this favourable data. The upper deck slab was insulated by combination of DBS and TCM, and the construction was surrounded by tent. in order to protect from outside wind. The test result shows that the lowest temperature of deck slab indicated 6$ ^{circ}C $. It demonstrated that this curing method can resist early frost and save construction cost in the side of management and saving labor cost, compared with previous method. In addition, the column specimen, combined both form and bubble board, exhibited favorable temperature history, due to internal hydration heat insulation effect.

• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2012년도 추계 학술논문 발표대회
• /
• pp.181-184
• /
• 2012

The Tuned Pendulum Slab Damper(TPSD)system is mainly composed of suspended pendulum slab which was hanging with cable wire from the top floor of building without any extra loads structurally, and can be helpful to reduce vibration with effect of tuned mass damper function by the principle of pendulum movement. The experiment was performed with miniatures of the 30stories of steel structure building by the forced vibration test using shaking table, and the result was reduced about 42% of vibration. The purpose of this study was to make analysis of application of the TPSD system to new building and exist building against strong wind or seismic wave. The result of this study was that the TPSD system shall be satisfactory in field of execution, process control, safety and economical efficiency with saving up to 70% of construction cost.

• 한국인쇄학회지
• /
• 제28권1호
• /
• pp.1-13
• /
• 2010

Gravure printing and manufacturing of advanced electronic components in a way that is going extra hold position. It is to print the electronic components of the rapid productivity improvements as well as cost-saving and environment-friendly industries such as the transition is a big advantage. However the mechanism of gravure is difficult to study scientifically because of high speed and excessively small size of the cell. To approach the mechanism we experimented using gravure printability. The condition of variables of IGT is pressure and velocity. By using Flow-3D simulation software, we built up the theoretical model under the constant variables. Then, we compared the real test with the simulation results. Therefore, it is studied the mechanism of gravure scientifically and it can be analysed the effect of the variable conditions.

• 한국국방경영분석학회지
• /
• 제35권1호
• /
• pp.95-103
• /
• 2009

HLA는 이기종 시뮬레이션간의 연동을 위한 IEEE 1516 표준이며, RTI는 연동을 위한 하부 인프라 서비스를 제공하는 기술이다. 본 논문에서는 HLA/RTI에 호환 가능한 OO기반의 페더레이트 모델 구조를 제안함으로써 코드의 재사용성을 높인다. 이는 시스템 개발 프로세스의 효율을 높이고, 개발시간의 단축 및 소프트웨어 개발 비용의 절감효과를 가져 온다. 제안된 페더레이트 모델은 이를 구현한 페더레이트에 대한 HLA 인증으로 그 실질적인 효과를 검증 받는다.

• 한국소성가공학회:학술대회논문집
• /
• 한국소성가공학회 2006년도 춘계학술대회 논문집
• /
• pp.261-264
• /
• 2006

Many process parameters have an effect on the auto-body panel forming process. A well-designed blank shape causes the material to flow smoothly, reduces the punch and yields a product with uniform thickness distribution. Therefore, the determination of an initial blank shape plays the important role of saving time and cost in the auto-body panel forming process. For these reasons, some approaches to estimate the initial blank shape have been implemented in this paper, the one-step approach by using a finite element inverse method will be introduced to predict the initial blank shape the developed program is applied to auto-body panel forming.

• 한국결정성장학회지
• /
• 제13권6호
• /
• pp.261-266
• /
• 2003

결정질 규소를 이용한 태양전지의 제조에 필요한 texture 식각 공정에 초음파를 적용하였다. 이 결과 $60^{\circ}C$에서 초음파를 적용하여 식각된 규소 기판으로 제조된 태양전지의 광전변환효율이 기존의 방식대로 $70^{\circ}C$에서 초음파 없이 식각된 규소 기판으로 제조된 태양전지의 광전변환효율보다 높았다. 이 결과는 규소를 이용한 태양전지의 제조에 필요한 식각공정에서 초음파를 적용하면 공정 온도를 낮출 수 있고 또한 사용되는 고가의 용액을 줄일 수 있어 전체적으로 태양전지의 제조 가격을 낮출 수 있는 가능성을 보여준다.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 1996년도 춘계학술대회 논문집
• /
• pp.44-48
• /
• 1996

This paper describes the effects of thermal deformation in electromagnetic chuck on the grinding accuracy. Gringing process is the last machining process and decisive in saving past other machining cost. The thermal deformation of grinding machine is unavoidable and affect seriously ginding accuracy. The thermaldeformation of electromagnetic chuck is one of important thermal problems. Heat generation of magnetic chuck is analyzed and measured. The temperature disturibution in chuck is elliptical form with high temperature in center of chuck. The thermal deformation form of chuck is changed with time to mountain form. The grinding experiment shows that the thermal deformation of magnetic chuck influence strongly machining accuracy as much as the headstock

• 한국원자력학회:학술대회논문집
• /
• 한국원자력학회 1998년도 춘계학술발표회논문집(2)
• /
• pp.470-475
• /
• 1998

The marginal nuclear criticality analysis for the high density spent fuel storage at a PWR plant was carried out by using the HELIOS and CASMO-3 codes. More than 20 % of the calculated reactivity saving effect is observed in this analysis. This mainly comes from the adoption of some important fission products and B-10 in the criticality analysis. By taking burnup and boron credits, the high capacity of the spent fuel storage rack can be more fully utilized, reducing the space of storage. Larger storage for a given inventory of spent fuel should result in remarkable cost savings and mort importantly reduce the risks to the public and occupational workers.

• 한국기계가공학회지
• /
• 제7권4호
• /
• pp.44-49
• /
• 2008

The characteristic of magnesium alloy is the most light in utility metal, the effect of electromagnetic wave interception, excellent specific strength and absorptiveness of vibration. Although magnesium alloy with above characteristic is a subject matter which is suitable in world-wide tendency of electrical component frame, sheet magnesium alloy is difficult to process. Therefore, forming analysis of sheet magnesium alloy and applying warm-working to process are indispensable. Among Finite element method, the static implicit finite element method is applied effectively to analyze sheet magnesium alloy stamping process, which include the forming stage. In this study, it was focused on the crack, wrinkling and spring back on sheet magnesium alloy stamping by the static implicit analysis. According to this study, the result of simulation will give engineers good information to access the forming technique on sheet magnesium alloy. And its application is being increased especially in the production of electrical component frame for the cost reduction, saving of defective ratio, and improvement of Productivity.