• Composites Research
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• v.16 no.3
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• pp.1-8
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• 2003

Densification occurs by the inelastic flow of the matrix materials during the consolidation processes at high temperature for MMCs, and the results depend on many process conditions such as applied pressure, temperature and volume fraction of fiber and matrix materials. This is particularly important in titanium matrix composites since material failure may occur by either the applied conditions or microstructural parameters through the processes, and thus a generic model based on micro-mechanical approaches enabling the evolution of density over time to be predicted has been developed. The mode developed is then implemented into FEM so that practical process simulation has been carried out. Further the experimental investigation of the consolidation behavior of SiC/Ti-6Al-4V composites using vacuum hot pressing has been performed, and the results obtained are compared with the model predictions.

• Composites Research
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• v.18 no.3
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• pp.21-30
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• 2005

Vacuum hot pressing has been used for the development of titanium metal matrix composites using foil-fiber-foil method. Heterogeneous microstructures prior to and following consolidation have been quantified, and the relations to densification behavior investigated. As shown by the results, dramatic variations of the microstructures including equiaxed $\alpha$, transformed $\beta$ and $ Widmanst\ddot{a}tten$ $\alpha$ are obtained during the process according to the fiber distributions. The dependence of microstructures on the consolidation then has been explained in terms of the change in mechanisms such as grain growth and recrystallization that occur with changing levels of inhomogeneity of deformation. Further, micro-mechanics based constitutive model enabling the evolution of density over time together with the evolutions of microstructure to be predicted has been developed. The mode developed is then implemented into finite element scheme so that practical process simulation has been carried out.

• Composites Research
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• v.17 no.1
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• pp.47-54
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• 2004

Vacuum hot pressing has been used for the development of titanium metal matrix composites using foil-fiber-foil technique. Subsequent micro-mechanical characteristics of the composites are then investigated by means of several experimental methods. The levels of consolidation, together with mechanism based failure processes of the materials have been analyzed by employing a thermo-acoustic emission technique. As shown by the results, fiber strength degradation occurs during the consolidation, and particularly residual stresses results from the thermal expansion mismatch between fiber and matrix materials during cooling process are incorporated in the changes of mechanical properties of the finished products. In industrial applications, both qualitative and quantitative evaluations of the material-mechanical characteristics are particularly important, and therefore must be included in process development. The present paper represents a methodology by which this can be achieved.

• 정보화사회
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• s.107
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• pp.18-24
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• 1996

이 자료는 정보통신부의 통신사업경쟁촉진 및 공정경쟁 강화 계획이다.

• Proceedings of the Korean Society of Dyers and Finishers Conference
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• 2012.03a
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• pp.118-118
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• 2012

현재 정부는 친환경녹색성장을 모티브로 환경기준을 강화하고 있으며, 오염 발생원을 최소화 하고자 현재 가동중인 환경기초시설을 대상으로 고도산화공정을 추가하여 오염 배출량을 최소화 하도록 정부와 지자체가 독려하고 있는 중이다. 따라서 대표적인 환경오염 업종인 섬유/염색 관련업체는 강화되는 환경기준을 만족하기 위한 공정검토가 불가피한 현실이다. 특히 대구 OO염색공단은 염색업체가 집적되어 있어 난분해성 오염물질과 색도유발물질이 다량 발생되고 있으며, 폐수처리장에서 운영 중인 재래식 폐수처리공정으로는 강화되는 방류수 수질기준을 충족할 수 없다. 따라서 본 연구에서는 방류수 수질기준을 만족하기 위한 고도산화 공정을 검토하였으며, 그 공정의 최적인자를 도출하고자 하였다. 고도산화 공정에서 오존산화, Peroxone AOP, Fenton oxidation 공정을 검토하였으며, 강화되는 수질기준을 만족할 수 있는 최적인자 및 처리효율을 검토하였다. 그 결과 조건에 따라 COD, T-N, T-P, 색도 등에서 처리효율은 40 ~ 90% 범위로 경제성을 고려하여 최적의 운전조건을 도출 하였다.

• Journal of Korea Fair Competition Federation
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• no.97
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• pp.12-25
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• 2003

공정거래법의 실효적 집행을 위해서는 무엇보다도 공적집행을 개선하는 것이 중요하다. 이를 위하여 무엇보다 합리적이고 투명한 절차운영과 이해관계인의 절차상 권리 강화, 경쟁보호라는 목적에 충실하기 위한 공정위의 독립성과 전문성 확보, 그리고 사법심사를 통한 공정위의 재량권 남용 통제의 강화 등이 이루어질 필요가 있다. 아울러 공정거래법의 실효적 집행은 절차법만의 문제가 아니라, 실체법의 문제이기도 하다는 점을 간과해서는 안 된다. 따라서 집행의 개선논의는 금지기준의 명확성, 타당성 및 목적적합성이라는 실체법적 차원에서도 아울러 접근하여야 한다. 그리고 이러한 실체법의 발전과 합리적인 법 적용이란 공정위의 준 사법 기관성에 걸맞는 경쟁법 전문가의 적극적인 활용에 크게 좌우되는 것임은 물론이다.

• Journal of Korea Fair Competition Federation
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• no.114
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• pp.2-6
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• 2005

시장의 가격시스템을 파괴하고 소비자에게 피해를 끼치는 카르텔은 그 해악이 매우 심각하기 때문에 경쟁 당국의 역할 중에서 카르텔을 억제하는 것만큼 중요한 일이 없다. 여기서는 이를 위한 공정거래위원회의 최근의 노력을 살펴보고 몇 가지 추가적인 법집행 강화방안 및 이를 위한 역량의 강화방안을 제시해 본다.

• Journal of Satellite, Information and Communications
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• v.10 no.3
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• pp.48-52
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• 2015

In this paper, we develops a domestic and foreign first reinforced cover glass grinding process for large surface TPS and resolves a problem of conventional cover glass grinding process through a research. Also, it is developed in priority to improve a productivity and processing quality emphasis. The development process develops a total process technology through a production and operation of demonstration unit. so, in this paper, we secured cover glass grinding process technology, image processing technology, mechanisms and control algorithms.

• Journal of the Korea Society for Simulation
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• v.27 no.1
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• pp.1-13
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• 2018

Earthwork planning is one of the critical issues in a construction process management. For the construction process management, there are some different approaches such as optimizing construction with either mathematical methodologies or heuristics with simulations. This paper propose a simulated earthwork scenario and an optimal path for the simulation using a reinforcement learning. For reinforcement learning, we use two different Markov decision process, or MDP, formulations with interacting excavator agent and truck agent, sequenced learning, and independent learning. The simulation result shows that two different formulations can reach the optimal planning for a simulated earthwork scenario. This planning could be a basis for an automatic construction management.

• Journal of Korea Fair Competition Federation
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• no.39
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• pp.38-39
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• 1998