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Topology Optimization of Thermal Insulators: Thermal-Structural Multi-Objective 2D SIMP Method
Minho Yoon(윤민호),Younghwan Joo(주영환) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4
A two-dimensional multi-objective topology optimization method considering both the thermal insulation and structural stiffness based on the solid isotropic material with penalization method is developed. The objective function is defined by introducing a weight factor that combines the thermal total energy and compliance for the thermal and structural problems, respectively. The method of moving asymptotes (MMA) is utilized to deal with both the negative sensitivity for the structural problem and the positive sensitivity for the thermal problem. The proposed multi-objective method is verified by comparing the analytical sensitivity with those obtained via the finite-difference method. Using the verified sensitivity, the method is applied to a benchmark problem involving a local heat source under a uniform mechanical load. The results are obtained for different values of the weighting factor and volume fraction.
시스템 다이내믹스를 활용한 자유시장경제와 조정시장경제의 비교 분석
윤민호 ( Minho Yoon ) 한국시스템다이내믹스학회 2020 한국시스템다이내믹스 연구 Vol.21 No.4
The purpose of this paper is to build a system dynamics simulation model of varieties of capitalism. The two-industry small open economy model is focused on the labour market. Liberal and coordinated market economies are characterized by high and low elasticity of wage and labour demand respectively. Simulation results show that there is no big difference between the average unemployment rates of two economies whereas liberal market economies have higher volatility. The cases of low(high) wage elasticity and high(low) labour elasticity make higher unemployment rates than liberal and coordinated market economies, which can be translated as institutional complementarities. Simulation results also replicate varieties of institutions as the source of comparative advantage that are main arguments of varieties of capitalism.
독일과 영국의 특허 발명자 데이터를 이용한 자본주의 다양성 이론에 대한 실증 분석
윤민호(Minho Yoon) 한국경제발전학회 2021 經濟發展硏究 Vol.27 No.4
본 연구의 목적은 독일과 영국의 특허 데이터를 이용하여 자본주의 다양성 론을 실증적으로 검증하는 것이다. 특히 자동차와 제약 산업에 초점을 맞추 어 이론이 예측한 특화가 실제로 일어나는지, 그리고 이론이 묘사하고 있는 혁신 시스템의 차이가 실제 존재하는지를 살펴보았다. 분석 결과는 독일 기 업들은 영국에 비해 점진적인 기술체제를 가진 기술에 특화하는 경향이 있고, 영국 기업들은 독일에 비해 이직자들을 통해 지식을 흡수·창출하는 경향이 있었으며 경제체제에 조응하지 않는 기술체제에서도 각 경제 체제의 특징이 관찰되었다. 이러한 결과는 자본주의 다양성론이 주장하는 제도적 비교우위 론과 제도의 경직성·일관성을 뒷받침하는 것이다. 하지만 자본주의 다양성론 의 주장과 달리 특화한 기술 영역도 있어서 자본주의 다양성 이론만으로 모 든 특화를 설명할 수 없음을 확인하였다. This paper investigated whether technological specialization and heterogenous R&D systems among countries expected by Varieties of Capitalism is empirically observed focusing on the automobile and pharmaceutical industries of Germany and UK. We found supportive evidence of Varieties of Capitalism that UK, compared to Germany, tend to specialized in the technological categories of which technological regime is characterized by incremental innovations and create new knowledge by hiring engineers. Moreover, the characteristics of R&D systems of two countries are observed even in the categories in which the countries do not specialized. This result is also consistent with arguments of Varieties of Capitalism that institutional coherence do not allow a breakaway from two ideal types of capitalism. On the other hand, two countries specialize some theoretically inappropriate categories, which means that Varieties of Capitalism cannot explain all specialization phenomena.
윤민호(Yoon, Minho) 한국사회경제학회 2012 사회경제평론 Vol.- No.38
본 논문의 목적은 기업의 존재이유와 기업의 범위결정을 신슘페터주의 진화경제학의 관점에서 설명하는 것이다. 본 논문에서는 Witt(1998)의 리더쉽 관점을 통해 소규모 벤처 기업의 탄생을 설명하고 복잡한 위계조직으로 변한 후에는 기업가의 인지 및 조정능력과 의사소통능력의 한계때문에 기업의 역량을 분리하는 것이 어렵다는 점을 논증한다. 본 논문의 기업이론은 기존이론과 비교했을 때 1) 기능주의적 설명과 진화론적 설명을 통합하고, 2) 산업 차원에서 기업의 범위 결정을 논할 수 있고, 3) 기업 범위의 산업 내 이질성을 설명할 수 있고, 4) 기업 범위의 변화를 설명하는데 적합하다는 강점을 지니고 있다. This paper aims to provide an evolutionary theory of firm existence and boundaries. We explicitly discuss about the cause of firm existence from the viewpoint of evolutionary economics, combine functionalistic and process-oriented explanation of firm evolution, and propose industry-level theory of firm boundaries. Vertical and horizontal firm boundaries are explained in the same frame.
크리스탈 사이클과 수요, 기술의 공진화: TFT-LCD 산업의 역사 친화적 모형
윤민호 ( Minho Yoon ) 한국시스템다이내믹스학회 2021 한국시스템다이내믹스 연구 Vol.22 No.2
This paper aims at building a history-friendly model which replicates the history of the Thin Film Transistor-Liquid Crystal Display (TFT-LCD) industry focusing on the industrial business cycle(crystal cycle) and co-evolution of demand and technology. The model is distinctive compared to existing models addressing industrial business cycles in two points: 1) endogenous demand and technological change are incorporated 2) industrial cycle affects evolution of demand and technology as well as are caused by the change of demand and technology, that is, we consider industrial business cycle as a medium of co-evolution of demand and technology. The simulation results show that it can successfully replicate the crystal cycle, and investment-production delay, price delay and endogenous change of demand are factors of the crystal cycle. Moreover, we can see positive feedback between demand expansion and technological advance through medium of the cycle.
Reference Electrode at Molten Salt: A Comparative Analysis of Electroceramic Membranes
Yoon, Seokjoo,Kang, Dokyu,Sohn, Sungjune,Park, Jaeyeong,Lee, Minho,Choi, Sungyeol Korean Radioactive Waste Society 2020 방사성폐기물학회지 Vol.18 No.2
A reference electrode is important for controlling electrochemical reactions. Evaluating properties such as the reduction potential of the elements is necessary to optimize the electrochemical processes in pyroprocessing, especially in a multicomponent environment. In molten chloride systems, which are widely used in pyroprocessing, a reference electrode is made by enclosing the silver wire and molten salt solution containing silver chloride into the membranes. However, owing to the high temperature of the molten salt, the choice of the membrane for the reference electrode is limited. In this study, three types of electroceramic, mullite, Pyrex, and quartz, were compared as reference electrode membranes. They are widely used in molten salt electrochemical processes. The potential measurements between the two reference electrode systems showed that the mullite membrane has potential deviations of approximately 50 mV or less at temperatures higher than 650℃, Pyrex at temperatures lower than 500℃, and quartz at temperatures higher than 800℃. Cyclic voltammograms with different membranes showed a significant potential shift when different membranes were utilized. This research demonstrated the uncertainties of potential measurement by a single membrane and the potential shift that occurs because of the use of different membranes.