• Proceedings of the KIPE Conference
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• 2019.07a
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• pp.80-82
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• 2019

태양광발전과 풍력발전으로 대표되는 분산형 전원이 계통에 연계됨에 따라 계통 사고 발생 시에 계통연계형 인버터에 대한 각국의 계통 규정(Grid code)이 더욱 엄격해 지고 있다. 최근 국외 계통 규정에서는 저 전압 사고뿐만 아니라 영 전압 사고 시에 인버터가 일정 시간 계통 연계를 유지하며 무효전류 출력 기법을 통해 계통 복구를 지원할 것을 요구하고 있다. 계통 사고 시, 사고 전압 잔존량에 따라 무효전류를 정확하게 출력하기 위해 인버터의 PLL(Phase Locked Loop) 제어는 중요하다. 그러나 이러한 PLL 제어의 동적 특성은 계통 사고 순간의 전압 강하 및 사고 위상에 따라 영향을 받게 되고 영 전압 사고에서는 위상 추종이 불가능하기 때문에 복합적인 문제가 나타난다. 본 논문에서는 영 전압 사고에서 사고 위상에 따라 각각 다르게 나타나는 PLL 동적 특성을 시뮬레이션을 통해 분석하였다.

• Proceedings of the Korea Contents Association Conference
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• 2011.05a
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• pp.121-122
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• 2011

본 연구는 한정된 비용으로 효율적/효과적인 기업성과를 도출하기 위해서는 R&D와 마케팅 부문의 연계가 필요하다는 기본관점에서 시작하였다. 연구 결과 R&D와 마케팅 연계 정도와 기술개발성공건수와는 무의미한 관계로 나타났으며 기술상용화건수와 매출액과는 유의한 (+)의 관계를 가지는 것으로 나타났다. 즉, R&D와 마케팅 연계는 기술개발 자체와는 관계가 없으며 개발된 기술의 경제적 성공에는 많은 영향을 미치는 것으로 나타났다.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.623-624
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• 2015

최근 산업의 발달로 전력소비량이 증가하면서 전력계통 주파수 안정화 및 전력평준화에 대한 대안으로 ESS에 대한 관심이 높아지고 있다. 이에 대해 출력변동이 심한 풍력발전에 배터리를 연계하여 운영하는 방법에 대한 연구가 활발히 진행되고 있다. 그러나 현재 국내에서는 ESS 연계 시 높은 초기자본비용과 ESS 운영방법에 대한 문제로 아직까지 활성화되지 못하고 있다. 따라서 본 논문에서는 ESS 연계 풍력발전단의 전력판매수익을 극대화하기 위한 운영기법에 대한 연구를 진행하였다.

• Korean Journal of Agricultural Science
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• v.30 no.1
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• pp.20-30
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• 2003

This study was carried out to examine the e-Business status of Korea Forest Product Industries and to propose the development. The use level of e-Business in korea forest product industries have stayed in internal company information network integration stages. But lots of companies located in the insufficient of e-Business models, the lack of qualified staffs, and the shortage of e-Business operating technology and implementation. As the result of this study, the followings must be considered; 1. For the promotion of e-Business use, it is needed to maintain price competitiveness, quality competitiveness, and market correspondence capacity. 2. For the settlement of e-Business models, it is important to connect information network among cooperation companies as like forest products standardize, common database, and standard electronic catalogue. Also, it needed developing program to strengthen the competitiveness of forest product industries, expanding to outsourcing and affiliated companies.

• Journal of the Economic Geographical Society of Korea
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• v.8 no.1
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• pp.51-70
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• 2005

Knowledge has become a primary source of competitiveness, and knowledge workers, people whose jobs require formal and advanced schooling, are one of the fastest growing groups in workforce. With the rise of a knowledge-based economy, higher education has been increasingly emphasized in economic development. Colleges and universities have recently added translation of research into products and new enterprises to their educational functions while companies have increased their external links to keep pace with rapidly changing and increasingly complex business environments. These changes have strengthened the role of colleges and universities in industrial innovation which is a key to economic development. This research reviews characteristics of U.S. higher education and development of interactions between higher education institutions and companies in the U.S. The case of IT industries, where U.S. has a competitive edge, provides specific examples and implications. Four major routes of interactions between higher education institutions and companies are suggested to provide a research framework for future studies in this area.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.1
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• pp.335-345
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• 2015

This study assessed the changes in Korea's industrial structure to analyze the linkage between years 1995-2000 -2005-2009 Industry Input-Output Tables to access the constant changes in the structure of the inter-industry linkage analysis. First, the Korean economy during the period of analysis was based on solid growth from 1,190 trillion won in 1995 to 2,775 trillion won in 2009. Second, the structure of the industry association in the case of industries, services and electronic form was as follows: in 1995, Heavy-heavy-primary, public; in 2000, service-heavy-heavy, electronic-primary, public; in 2005 Services - Manufacturing - Consumer Goods - first, public, service; and 2009 e-manufacturing - Consumer Goods - primary, the public.

• Journal of the Economic Geographical Society of Korea
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• v.12 no.3
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• pp.277-290
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• 2009

This paper aims to draw essential facts of network city, to analyze the urban corridor in South-East region, Korea, as a network city. Firstly, the characteristics of the network city is examined theoretically. The global economy is developing an innovative class of network cities. A network cities evolve when two or more previously independent cities, potentially complementary in function, strive to cooperate and achieve significant scope economies aided by-fast and reliable transport and communications infrastructure. Network Cities place a higher priority on knowledge-based activities like research, education and the creative arts. Each constituting city stands to benefit from the synergies of interactive growth via reciprocity, knowledge exchange and unexpected creativity. Secondly, we discussed the network structure of cities in South-East region, Korea itself intensively. We survey the network location and outline of the urban corridor in South-East region, spatial specialization and interaction between the constituting cities. We also discussed the problems of the network cities in South-East region, Korea and introduced the desirable policies and alternatives. We can ascertain from the case study of cities in South-East region that the cities in South-East region corresponds the network city model fairly.

• Journal of the Economic Geographical Society of Korea
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• v.8 no.2
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• pp.195-215
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• 2005

This study was carried into execution to analyze Spatial Characteristics of Seoul Business Services Cluster in circumstance of local economic development led by knowledge-intensive business services. The analysis was performed for industrial agglomeration and companies' linkage and network. As the result, there are three business services cluster, including the largest one in Gang-Nam Gu, Seoul, and for last 10 years, there has been increasing development of business services cluster. In the meanwhile, their linkage and network have not been performed briskly. Therefore, from now on, a plan that can help companies' linkage and network performed inside of cluster to have active and international structure has to be considered in cluster policy.

• Journal of Korea Technology Innovation Society
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• v.10 no.3
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• pp.531-554
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• 2007

This paper suggests a new model connecting various knowledge activities through classification systems such as classifications of research, technology, industry, major and job. Although research activities are linked to technology and industry areas or to education and job areas, there is no effort to link these kinds of activities. There are a few studies to link research and technology or research and education respectively. But, there have been no studies to connect technology-industry linkage and education-job linkage. This paper suggests that research area can be a basis of link between technology-industry linkage and education-job linkage. The methods building the links are not simple, but easy; 1) setting up new science/research classification system having two dimensions of research and application, 2) building electronic systems and databases allowing fields for several classification systems, and 3) making rules using multi-dimensional classification systems following the purpose of the programs. The model is designed to meet the needs of nationwide R&D and human resources policies, and for the preparation of knowledge society to grasp the relationship between sequential activities using knowledge. If we know the interactive relationships between various areas, we can trace related phenomena in different activities with restricted information.

• Journal of Technology Innovation
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• v.17 no.2
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• pp.25-53
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• 2009

The purpose of this paper is to analysis sectoral patterns of technological innovation in Korean manufacturing sector. Pavitt(1984) put forward a well-known taxonomy that industries three groups of industries characterized by markedly different innovative modes, namely science-based, production-intensive and supplier-dominated industries. Using Pavitt's taxonomy as a framework, we try to explain similarities and differences among sectors in the sources and impact of innovations. Based on a sample of 2,371 firms in manufacturing industry, this paper investigated its relevance to explain the sources and directions of innovative activities in Korean industries. Empirical study shows that in supplier dominated firms most process innovations come from suppliers of equipment and materials. In science-based firms product innovation is produced internally, based on the rapid development of the underlying sciences in the universities and research institutes. It also shows that production-intensive firms have a positive association between innovativeness and customer collaboration. This explanation has implications for our understanding of the sources and directions of technical changes, the formation of technological advantages at the level of both region and country.