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이철우(Lee, Chul-Woo),최요섭(Choi, Yosub),이종호(Lee, Jong-Ho) 한국지역지리학회 2016 한국지역지리학회지 Vol.22 No.2
본 연구는 국가주도형으로 조성된 대표적인 산업집적지인 구미 IT 클러스터의 내생적 발전 가능성을 탐색하기 위해서 2005년부터 추진되어 온 산업단지 혁신클러스터정책의 미니클러스터 사업에 대하여 심층 고찰한 것이다. 구미 IT 클러스터를 구성하고 있는 산 · 학 · 연 주체들로 구성된 미니클러스터들은 관 주도의 외생적 조직으로 형성되었으나, 점차 자생적 조직화 과정을 거치면서 자율적인 학습 커뮤니티 조직으로 진화되는 모습을 나타내고 있다. 이를 통해 국지적 학습과 지식 공유가 활성화될 수 있는 사회적 자본의 축적과 국지적 뿌리내림으로 참여기업들뿐만 아니라 지역 기업들의 경쟁력 강화에 기여한 것으로 평가된다. 이러한 성과는 정부주도형으로 형성된 외생적 산업집적지가 대 다수를 차지하고 있는 한국의 산업집적지 활성화 정책 수립에 있어서 중요한 시사점을 제공한다. 특히 본 연구 결과 는 미니클러스터 사업과 같이 자생적인 학습 커뮤니티 조직이 활성화될 수 있는 소프트웨어 중심의 클러스터 사업이 일관성 있게 추진될 필요가 있음을 강조한다. Although industrial complexes have played as an engine of the Korean economy for the last 40 years, the majority of industrial complexes shows limitations to the continuous growth such as a lack of innovation capabilities and social capital, conceived as a key to transforming into clusters of innovation. To overcome those problems, the Korean government embarked on the cluster policy from the mid 2000’s, focusing on promoting the endogenous development capabilities of individual industrial complexes. Drawing upon the in-depth case study of the Gumi IT cluster, one of the representative large-scale industrial complexes in Korea, the authors conclude that the cluster policy has contributed to making the Gumi IT cluster enhance the capabilities of endogenous development through the facilitation of self-organizing learning communities within the cluster.
Aligned Reverse Frame Structure for Interference Mitigation in Dynamic TDD Systems
Lee, Kwonjong,Park, Yosub,Na, Minsoo,Wang, Hanho,Hong, Daesik IEEE 2017 IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS Vol.16 No.10
<P>The dynamic time division duplex (TDD) system has been proposed as a way to meet today's asymmetrically and dynamically changing traffic demand. However, this approach causes cross-link interference, because neighboring base stations and user elements transmit in opposite directions. In this paper, we investigate and analyze the characteristics of cross-link interference in dynamic TDD systems. Based on this observation, we propose an aligned reverse frame structure to utilize and cancel the cross-link interference. Mathematical analysis and numerical results verify that the proposed scheme achieves performance enhancement in terms of capacity compared with conventional dynamic TDD systems.</P>
User Association for Full-duplex Cellular System
SooHyun Kim,Hyunsoo Kim,Yosub Park,Kwonjong Lee,Daesik Hong 대한전자공학회 2017 대한전자공학회 학술대회 Vol.2017 No.1
In the cellular network, in-band full duplex (FD) has regarded as a promising technique for improving spectral efficiency. However, implementing FD transmission in the cellular network results in severe inter-user interference (IUI). In order to mitigate IUI, in this paper, we propose distributed user association algorithm for FD cellular system where user equipments (UEs) are sequentially arriving. We first observe the impact of neighbor UEs on the user association. Based on the observation, we propose the user association algorithm for the newly arriving UE which can avoid strong IUI from neighbor UEs. The proposed algorithm only requires the UE to estimate the IUI and the strength of the received signal from the BSs, and it does not require cooperation between BSs. Thus, it can achieve practical signaling overhead. Finally, simulation results demonstrate that proposed algorithm can improve the UE throughput compared to the conventional association based on the maximum power of the received downlink signal.