• 한국시스템다이내믹스연구
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• 제13권1호
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• pp.113-131
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• 2012

Applying social network analysis techniques, this study examines complex system characteristics of industry-university joint research R&D networks. In specific, it focuses on whether these R&D networks comply with the power law, whose system typically presents the-rich-get-richer and the-poor-get-poor patterns. The basic data come from 7,751 industry-university joint research projects, all of which were carried out by Daejeon, Chungbuk, and Chungnam-based universities from January 2005 to October 2008. The empirical results reveal that the R&D networks abide by the power law. That is, a handful of business units and universities command an overwhelming majority in the joint links, indicating positive feedback dominance within the system.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 제38회 하계학술대회
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• pp.1385-1386
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• 2007

전통적으로 초고압 지중케이블 접속함으로 현장에서 절연을 형성하여 전기적 성능을 유지하는 TMJ(Tape Molded Joint), TJ(Taped Joint), EMJ(Extruded Molding Joint) 및 공장에서 절연물을 가공하여 현장에서 조립만으로 설치를 완료하게 되는 PJ(Prefabricated Joint), PMJ(Pre-Molded Joint) 등이 사용되어 왔다. 최근에 PMJ에 사용되는 재료의 발전과 PMJ의 조립시간 단축, 원가 절감 및 공장 출하시 검사에 의한 신뢰성 향상으로 지중케이블 접속함 시장에서 PMJ의 비중이 점차 확대 되어가고 있다. 이에 당사는 이미 230kV급 PMJ의 개발을 완료하였으며, 이러한 기술적 배경을 바탕으로 현재 PMJ로서는 세계에서 최고 전압급에 속하는 400kV급 PMJ의 개발을 완료하게되었다.

• Journal of Korea Trade
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• 제23권2호
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• pp.46-58
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• 2019

Purpose - This paper analyzes how Research and Development (R&D) cartelization and Research Joint Ventures (RJV) affect firms that engage in Cournot competition in their product market using a model in which the Home and Foreign firm produce differentiated products and export their total output to a third country's market. Design/Methodology - In a two-stage game, research expenditures incurred in the first stage improve product quality and are subject to various degrees of spillovers. We consider four different scenarios. Findings - In a symmetric equilibrium we observe the following: (i) an RJV that cooperates in R&D decision yields the highest R&D expenditure. However, the scenario which yields the lowest expenditure depends on the extent of differentiation between the goods and the degree of spillovers; (ii) RJV cartelization yields the highest product quality, output, and consumer surplus in the third country; however, the lowest is produced by R&D competition if spillovers are strong and by R&D cartelization if spillovers are weak; and (iii) each firm's profit is at its minimum in R&D competition and its maximum in RJV cartelization. Furthermore, if spillovers are strong, the profit of each firm in R&D cartelization is greater than that in RJV competition, and vice versa. Originality/value - By analyzing product innovation in international markets, we can find similarities and differences between process R&D and product R&D in international markets.

• 한국전자거래학회지
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• 제23권1호
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• pp.23-36
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• 2018

공동연구 참여기관의 협력요소와 공동연구성과 간의 인과관계를 협력적 노력의 매개효과와 함께 분석하였다. 협력요소는 공동연구성과의 영향요인으로 사용되는 전략적 합의, 자원 보완성, 신뢰, 흡수역량으로 구성된 2차 요인이다. 공동연구성과에 대한 영향을 분석함에 있어 공동연구 참여를 결정하는 요인인 협력요소와 공동연구 수행 과정에서 성과에 영향을 줄 수 있는 협력적 노력을 구분하고자 하였다. 즉, 공동연구 수행 전과 수행 과정의 영향요인이 공동연구성과에 어떠한 영향을 주는지 구분하여 분석하고자 하였다. 결과를 종합하면 첫째, 전략적 합의, 자원 보완성, 신뢰, 흡수역량은 협력요소라는 2차 요인으로 구성하는 것이 적합하며, 협력요소는 장기 및 단기 공동연구성과 모두에 정의 유의한 영향을 갖는다. 둘째, 협력적 노력은 협력요소와 단기적 공동연구성과의 유의한 매개효과를 갖는다. 그러나, 장기적 공동연구성과에 대한 매개효과는 검증되지 않았다. 즉, 협력요소는 공동연구 참여의도를 높이고 공동연구성과에 긍적적 영향을 주지만, 협력적 노력은 단기적 성과에만 긍정적 영향을 줄 수 있음을 보여준다.

• Journal of information and communication convergence engineering
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• 제2권4호
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• pp.247-250
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• 2004

Currently, advanced countries such as European countries and Japan invest lots of efforts to develop improvement of electric power production and supply, environmental countermeasure, and renewable energy development. Accordingly, Korea has been putting efforts to all kinds of electric related technical development based on the mid-long term plan. Further, it is necessary to increase effectiveness of R&D investment by propelling joint research activities with advanced countries for development of important technologies. Based on this background, this study tries to find thought-provoking suggestions of energy projects, programs and policies. For a comparative analysis, Japan which is similar to Korea in terms of market size and policies, and EU where joint research has been actively carried out among nations are analyzed and compared to policies and joint R&D activities of Korea.

• 한국자기학회:학술대회 개요집
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• 한국자기학회 2008년도 Asian Magnetics Conference
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• pp.178-178
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• 2008

This paper presents an efficient approach for simulating the loss of the laminated core joints in power transformers. Two laminated core models, with the same material and joint type but different leg length, are established for validating the specific total loss inside the joint region.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 제37회 하계학술대회 논문집 C
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• pp.1564-1565
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• 2006

현재 전세계적으로 170kV급 이하의 초고압 지중케이블 접속함으로 기존의 현장몰드방식의 TMJ(Tape Molded Joint)와 부품조립방식의 PJ(Prefabricated Joint)보다 조립시간이 짧고 작업자의 숙련도가 높지 않아 경제적이며, 유지보수에 장점을 가진 고무몰드 접속함(PMJ)이 채용되고 있으며, 이러한 추세는 적용 전압급이 점차 상승하면서 230kV급까지 그 비중이 늘어나고 있는 경향을 보이고 있다. 당사에서는 이러한 추세에 발맞추어 154kV급 고무몰드접속함의 개발 당시의 Silicone의 기초물성시험 DATA 획득, 고무몰드 UNIT 및 금형 설계 기술 확립과 접속 공법 개발의 경험을 바탕으로 230kV급 고무몰드접속함의 개발에 성공하였다.

• Structural Engineering and Mechanics
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• 제32권3호
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• pp.447-457
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• 2009

A general analytical method for computing the joint stiffness from the sectional properties of the members that form the joint is derived using Vlasov's thin-walled beam theory. The analytical model of box T-joint under out-of-plane loading is investigated and validated using shell finite element results and experimental data. The analytical model of the T-joint is implemented in a beam finite element model using a revolute joint element. The out-of-plane displacement computed using the beam-joint model is compared with the corresponding shell element model. The results show close correlation between the beam revolute joint model and shell element model.

• Journal of Welding and Joining
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• 제35권3호
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• pp.1-6
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• 2017

The effect of metal turnover (MTO) of electroless Ni plating bath on the brittle fracture behavior of electroless nickel electroless palladium immersion gold (ENEPIG)/Sn-3.0wt%Ag-0.5wt%Cu(SAC305) solder joint was evaluated in this study. The MTOs of the electroless Ni for the ENEPIG surface finish were 0 and 3. As the MTO increased, the interfacial IMC thickness increased. The brittle fracture behavior of the ENEPIG/SAC305 solder joint was evaluated with high speed shear (HSS) test. The HSS strength decreased with increasing the MTO of the electroless Ni bath. The brittle fracture increased with increasing the shear speed of the HSS test. The percentage of the brittle fracture for the 3 MTO sample was much higher than that for the 0 MTO sample.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1990년도 한국자동제어학술회의논문집(국제학술편); KOEX, Seoul; 26-27 Oct. 1990
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• pp.913-916
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• 1990

In this paper, attempts have been made to control AC synchronous servo motor used as actuators of joints of the FARA robot with high dynamic performance and precise positioning. The AC synchronous servo motors used in FARA robots have resolves as position sensors. Resolver to digital converters are used in order to obtain the information of rotor speed and position from resolver outputs. The proposed joint position control system consists of four speed controller and one position controller. Analog methods are used in the position controller, while digital methods are used in the position controller. For precise position control, PID control algorithm and interpolation functions are executed in two 16 bit microprocessors with sampling rate 2ms. Experimental results show that the proposed joint position control system can be effectively applied to industrial robots in order to obtain high dynamic performance and precise positioning. The proposed joint position control system is being used in the control of FARA robots of Samsung Electronics.