• 환경위생공학
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• 제24권1호
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• pp.25-32
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• 2009

The analyzed results of the heavy metal concentration of air and soil at the D iron-manufacturing company area were as follows; The concentration of $PM_{2.5}$ in the case area exceeded the air standard level in 3 seasons except summer. The $PM_{10}$ level was similar to the standard level, which was similar to the standard level, which was $50{\mu}g/m^3$. The Pb concentration of air in the case area was $0.13{\mu}g/m^3$, which was slightly higher than $0.11{\mu}g/m^3$ in the control area. The concentration of Cd and Cr were higher in the control area. The heavy metal (Pb) concentration of soil in the case area was $10.7{\mu}g/m^3$, which was higher than that of the control area. For these results, it is necessary for the D iron-manufacturing company area to consider a counter plan for dusts and are duction plan for the heavy metal (Pb).

• 한국콘텐츠학회:학술대회논문집
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• 한국콘텐츠학회 2008년도 춘계 종합학술대회 논문집
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• pp.198-202
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• 2008

대규모 3D 컴퓨터애니메이션의 제작공정은 제작기술의 발전과 예산의 대규모화로 인해 그 구조가 더욱 복잡화, 세분화, 되고 있으며, 프로덕션타입, 제작규모, 제작방식과 같은 유형에 따라 제작 파이프라인의 형태가 다양하게 변화되고 있다. 하지만, 소규모 제작업체에서는 제작 파이프라인의 개념과 그 구성에 대한 변화와 발전이 미비하여 이에 대한 재조명이 필요할 때이다. 이러한 연구의 배경을 주목하여 본 연구는 국내 소규모 3D애니메이션의 제작 파이프라인에 대한 이해를 돕고, 소규모 국내 프로덕션 실정에 맞는 3D애니메이션 제작 파이프라인의 구성 방안을 모색 하고자하는데 그 목적을 가진다. 본 연구에서 제시하는 소규모 3D애니메이션의 제작 파이프라인 구성 모델과 방법론은 프로젝트의 성향이나 주변 환경에 따라 충분히 변화 가능한 것이기 때문에 절대적인 것만은 아니며, 3D 컴퓨터애니메이션 제작 파이프라인의 구성을 위해서는 그 목적을 충분히 이해하고, 프로덕션내의 작업자간의 정보의 공유가 충분히 이루어질 수 있도록 소규모 프로덕션의 환경을 고려하여 상황에 맞추어 구성 할 수 있는 방법이 될 것이라고 생각한다.

• 통상정보연구
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• 제10권1호
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• pp.295-314
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• 2008

I compared trade structure and competitiveness by sector using industrial classification in UN Comtrade data and SITC. Based on the comparison, I calculated market share, export competitions, RCA, and TSI. and then selected sensitive industries based on competitiveness, and identified the ZOPA and our BATNA. These calculations confirmed the industries damaged by FTA and those benefiting from the FTA between Korea and Japan, the study them developed strategies for VIA negotiation. It is to minimize damages to Korean economy and to maximize benefits from the agreement. The negotiation plan allowed an adjustment period for industries, for which damages are expected, by setting a long grace period before implementing tariffs. Based on the negotiation plan made through economic analysis, I intend. contribute to more efficient promotion of negotiation by extracting the optimal FFA negotiation plan for each manufacturing industry.

• 한국CDE학회논문집
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• 제6권4호
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• pp.263-270
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• 2001

In stamping-die manufacturing, the first step is to build die patterns for lost wax casting process. A recent industry trend is to manufacture the die pattern using 3-axis NC machining. This study identifies technical considerations of the pattern machining caused by the characteristics of Styrofoam material, and proposes technical methods related to establishing a process plan and generating tool paths for optimizing the pattern machining. In this paper, the process plan includes the fellowing three items: 1) deter-mining a global machining sequence-a sequence of profile, top, bottom machining and two set-ups, 2) extracting machining features from a pattern model and merging them, and 3) determining a machining sequence of machining features. To each machining feature, this study determines the machining start point, generates the approach tool path, and proposes a tool path linking method fur reducing the distance of the cutter rapid motion. Finally, a smooth tool path generation and an automatic feedrate adjustment (AFA) method are introduced far raising the machining efficiency.

• International Journal of Reliability and Applications
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• 제18권2호
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• pp.21-44
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• 2017

Accelerated life tests (ALTs) are frequently used in manufacturing industries to evaluate the reliability of products within a reasonable amount of time and cost. Test units are subjected to elevated stresses which yield quick failures. Most of the previous works on designing ALT plans are focused on tests that involve a single stress. Many times more than one stress factor influence the product's functioning. This paper deals with the design of optimum modified ramp-stress ALT plan for Burr type XII distribution with Type-I censoring under two stress factors, viz., voltage and switching rate each at two levels- low and high. It is assumed that usage time to failure is power law function of switching rate, and voltage increases linearly with time according to modified ramp-stress scheme. The cumulative exposure model is used to incorporate the effect of changing stresses. The optimum plan is devised using D-optimality criterion wherein the ${\log}_{10}$ of the determinant of Fisher information matrix is maximized. The method developed has been explained using a numerical example and sensitivity carried out.

• 전력전자학회논문지
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• 제27권5호
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• pp.397-401
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• 2022

The construction of the ITER tokamak machine is ongoing at a 77% process rate to achieve the first plasma in 2025. The 18 sets of power supply systems comprising 400 MVA thyristor AC/DC converters for the superconducting magnets supplied by Korea (KO) are being installed with other systems, such as PF converters (China), DC busbars (Russia), and cooling water systems (India), in two buildings (Europe). The system interfaces have been defined during the design stage, and the systems have been manufactured. However, during the on-site installation work, several installation and integration issues emerged due to the manufacturing tolerance and design mistakes. To continue the installation and testing, the engineers of each system resolved the interface issues, planned the commissioning, and integrated the test plan. This paper describes the on-site installation status and issues and the commissioning plan of KO AC/DC converters.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2010년도 춘계학술대회 논문집
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• pp.435-436
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• 2010

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2009년도 춘계학술대회 논문집
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• pp.657-658
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• 2009

• 대한안전경영과학회:학술대회논문집
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• 대한안전경영과학회 2008년도 추계학술대회
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• pp.541-553
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• 2008

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 1994년도 박판성형기술의 진보
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• pp.119-128
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• 1994

Until recently, Stamping tool manufacturing depend on skilled designers and technicians, because it has many parameters. So, Try-out time not controlled. We now apply CAE, preliminary experiment, material database and automated stain measurement in stamping tool manufacturing for concurrent engineering that decreases product development circle time, saves cost, improves product reliability. Automated strain analysis and measurement environment gives very accurately informations to technicians of stamping tool manufacturing. They analysed the part in problem and appled to results in Try-out step.