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등방성체와 직교이방성체의 접합계면네 내재된 동적모드 III 균열의 등속전파
이광호,황재석,유재용,Lee, Gwang-Ho,Hwang, Jae-Seok,Yu, Jae-Yong 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.12
The dynamic problems of interface crack propagated with constant velocity along the interface of bimateraial composed of isotropic and orthotropicmaterial under antiplane loading condition are studied in this paper. The general dynamic stress fields and displacement fields of mode III are derived when interface crack between isotropic and orthotropic material is propagating with constant velocity. The general dynamic stress fields and displacement fields in isotropic material. Finally, the characteristics of interface crack propagation are studied with various properties of isotropic and orthotropic material and crack propagarion velocities.
이광호(Kwang Ho Lee),조용래(Yongrae Cho),우청원(Chungwon Woo),정장훈(Jang Hoon Chung),최종화(Jonghwa Choi),이주영(Juyoung Lee),유상욱(Sanguk Yu),이충현(Choong Hyun Lee),김은아(Eun-A Kim),김명순(Myungsoon Kim) 과학기술정책연구원 2016 정책연구 Vol.- No.-
The convergence of technology and industry has been recognised as a key to overcome growth slowdown in major industries at the country level. However, evidence-based policies and institutions regarding the convergence are still in its infancy. A theory of technological innovation patterns, which is one of major theories on technological innovation, argues that policies must be set in the context of industrial innovations considering its key attributes and innovation paths. Based on the theory, understanding relationships between the patterns and convergence can provide significant insights to formulate appropriate policies on industry convergence. This research has questioned that the Pavitt’s theory of technological innovation patterns analysing British firms a few decades ago is still available for major industries in Korea. Other issues to be questioned are what the impacts of convergence which widely spreads out every technology and industry on technological innovation patterns are and how to verify them. Based on the questions, this research aims to analyse technological innovation patterns for major industries in Korea by periods and to identify the impacts of convergence on the patterns. Furthermore, policy directions can be suggested based on the results in order to be ready to upcoming technological innovation challenges. The research focused on two major leading industries, automobile and display. It divided historical trajectories of both industries into three parts and analysed their key attributes of industry environment and institution, technological regime and organizational response by each period. The cases were analysed using a framework combined two theories of technological innovation patterns and sectoral innovation systems accompanied by patent data for quantitative analysis. As a result, technological innovation patterns of both automobile and display industries have transformed from scale-intensive to science-based in Pavitt’s taxonomy by periods. In particular, convergence between electronic engineering and information and communication technology (ICT) has led to radical transformation in the automobile industry. Meanwhile, changes of display industry have been mainly caused by convergence between semiconductor materials technology and nanotechnology. In addition, the co-evolution of technology regime and industry environment and institution has influenced the changes of technological innovation patterns. With the results of analysis, the research recommends several applicable policies to improve coherence between industry environment and institution, technological regime and organizational response. Firstly, a guideline and roadmap for regulation improvement are required to respond next architecture transformation. Secondly, domestic mergers and acquisitions (M&A) and joint ventures should be accelerated. Thirdly, it is necessary to raise specialized research and development (R&D) companies and to access a niche market generated by segmented value chain trends. Fourthly, monitoring systems offering information on technology and industry convergence are required under scrutiny of global trends in regulation changes. Fifthly, there is a need to promote initial markets targeting on convergence products through innovative public procurement systems. Lastly, task-force team underlying interdepartmental agreement and incentives for performances are essential to compel integrated policies.
하천수질예측 Model(I)-WQRRS Model에 의한 한강 하천수질예측-
심순보,이광호,유병로,Sim, Sun-Bo,Lee, Gwang-Ho,Yu, Byeong-Ro 한국수자원학회 1984 물과 미래(한국수자원학회지) Vol.17 No.1
This study has performed to investigate and evaluate the simulation model of steam Water Quality and the simulated results have 매내 been compared with the observed data in the Han River. The predicted BOD, Total-N, Coliform concentrations in the downstream of the Chungrang-Cheon are 8.6m/1, 4.5mg/1 and $3.7X10^5$ respectively. It is interesting to note that the results simulated based on the WQRRS model are extremely in good agreement and also are very much comparable with those observed data reported previously references.
L . bulgaricus CH - 2 와 Str . thermophilus 에 의한 발효유의 풍미성분에 관한 연구 2 . 휘발성 유리지방산의 변화
유제현,제등 승,이광호 ( J . H . Yu,M . Satio,K . H . Lee ) 한국축산학회 1985 한국축산학회지 Vol.27 No.1
This experiment was conducted to study the change of flavor components, especially volatile free fatty acids, during earmentation by Str. thermophilus, L. bulgaricus and the associated culture of the two species. The results obtained are summarised as follows: 1. In the production of total volatile fatty acid, it was found that Str. thermophilus was concerned most significantly and that symbiotic activity was shown slightly. 2. In the change of volatile free fatty acid considered as contributing to the balance of flavor substances rather than main flavor components, the change of acetic acid contents was shown distinctively, and especially L. bulgaricus which characteristics a comparatively high-proteolytic activity in milk, produced the acetic acid in the highest amount, and the symbiotic relationship was shown mildly.
국내 기상조건하 주거용 건물 가스 보일러의 부분부하 특성과 에너지 사용량 분석
유병호(Byeong Ho Yu),서병모(Byeong-Mo Seo),문진우(Jin-Woo Moon),이광호(Kwang Ho Lee) 대한설비공학회 2015 설비공학 논문집 Vol.27 No.9
Residential buildings account for a significant portion of the total building-energy usage in Korea, and a variety of research studies on the domestic boiler have therefore been carried out; however, most of these studies examined the boiler itself, whereby the part-load ratio characteristics and the corresponding gas-energy consumption patterns were not analyzed. In this study, the part-load ratio and operating characteristics of a domestic gas boiler were analyzed within a residential building equipped with a radiant floor-heating system; in addition, the energy consumption between condensing and conventional boilers was comparatively analyzed. Our results show that significant portions of the total operating hours, heating load, and energy consumption are in the part-load ratio range of 0 through 40%, whereby the energy consumption was significantly affected by the boiler efficiency under low part-load conditions. These results indicate that the part-load operation of a boiler is an important factor in residential buildings; furthermore, replacing a conventional boiler with a condensing boiler can reduce annual gas-energy usage by more than 20%.
손정은(Jeong-Eun Son),유병호(Byeong-Ho Yu),김홍욱(Hong-Wook Kim),이광호(Kwang Ho Lee) 대한설비공학회 2016 대한설비공학회 학술발표대회논문집 Vol.2016 No.6
Properly controlled UFAD systems under cooling operation produce thermal stratification exhausting the conditioned-air supplied from floor diffuser to the return plenum after removing the heat load of occupied zone. Thermal stratification is one of the important features of UFAD systems; it eliminates the necessity to consider heat from convection that occur in areas other than lower occupied zone. Hence, the system is more energy effective compared to conventional overhead systems that presume the entire space as an air conditioning space. Thus, enhancing the thermal stratification is necessary for the UFAD systems performance. In this study, we assess the UFAD energy performance by considering the thermal stratification as an input variable through the EnergyPlus simulation. As a result, enhancing thermal stratification improves the cooling energy saving potential by more than 15% as expected. On the other hand, the reduction of thermal stratification causes the increase in supply air volume so that air conditioning of occupied zone as well as upper mixed zone is needed.
사무소 건물에서 냉동기의 부분부하율 및 냉방 에너지 성능 특성 분석
서병모(Byeong-Mo Seo),유병호(Byeong-Ho Yu),이광호(Kwang-Ho Lee) 대한설비공학회 2015 설비공학 논문집 Vol.27 No.11
Commercial buildings account for significant portions of the total building energy in Korea, and thus, a variety of research on chiller operation has been carried out. However, most of the studies were carried out on the chiller itself, i.e., the part load ratio characteristics and the corresponding electricity energy consumption patterns were not analyzed in existing studies. In this study, the part load ratio and the operating characteristics of the vapor compression chiller were analyzed within an office building equipped with the conventional variable air volume system. As a result, significant portions of total operating hours, cooling load, and energy consumption turned out to be in the part load ratio range of 0 through 50%. Thus, energy consumption was significantly affected by the chiller COP at low part load conditions, indicating that chiller operation at the part load is an important factor in commercial buildings.