• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.9
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• pp.5998-6008
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• 2015

The value of social network and entrepreneurial orientation has widely been acknowledged as a critical resource of business success. However, the previous studies did not specify each role and conceptually have examined them as separate antecedents of firm performance. This study develops propositions concerning network capabilities and investigates the moderating effects of network structures (degree centrality, closeness centrality, and betweenness centrality) on the relationship between entrepreneurial orientation and firm performance. This research conducted with a sample of 115 small consulting companies in Korea. The findings indicate that closeness centrality moderates the relationship between proactiveness and performance. Also, the combination of betweenness centrality and proactiveness exerts a positive impact on performance. Accordingly, degree centrality enhances the influence of innovativeness on performance. In particular, betweenness centrality exacerbates the influence of risk-taking on performance against our expectation. Overall, these findings conclude the synergistic effects of network capability and entrepreneurial orientation on firm performance. Finally, practical implications and academic propositions are presented regarding the way firms could most effectively utilize entrepreneurial orientation and network capability to maximize firm performance.

• Journal of the Korean Society for information Management
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• v.26 no.3
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• pp.7-24
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• 2009

Since the Web is dynamic, it is necessary to analyze scholarly Web space with both quantitative and qualitative methods for better understanding of communication characteristics. In this study, we analyzed contents of pages and links to ascertain the characteristics of Korean scholarly Web space in terms of network structure and communication behavior. The result shows that the structure of the original network with all the external links remained is not much different from that of the network with activated external links only. However, the purposes of linking vary among scholarly institutions. The centrality measures correlate more strongly with the clustering coefficient than with the constraint index implying the similar explanatory power of the two types of structural indices.

• Journal of Distribution Research
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• v.16 no.2
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• pp.95-118
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• 2011

The purpose of this study is as follows. First, we investigate empirically the effects of social network properties such as social network density and centrality of a franchisee on its information sharing with various subjects such as the franchisor and other franchisees in the franchise system. Second, we examine exploratively if tie strength between a franchisee and its franchisor plays a moderating role on the relationship between social network properties and information sharing. The study model was established as shown in

• Journal of the Society of Disaster Information
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• v.17 no.3
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• pp.454-464
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• 2021

Purpose: There is a need to construct an evacuation passageway for the 2-Arch tunnel, which has been constructed and is in operation. Therefore, it aims to analyze tunnel and center wall behaviour and stability due to excavation of the center wall. Method: We describe the theoretical background of 2-Arch tunnel and evacuation passageway, and focused on analyzing the behaviour of tunnel and wall using 3-dimensional finite element analysis. Parametric analysis according to rock rating was performed with various ground conditions, and the displacement and stress of the center wall were intensively analyzed. Result: With the center wall excavation, the largest amount of settlement was shown in the center of the opening, and the stress was greatest during the first excavation. In addition, it was shown that stress concentration occurred at the top of both openings, and stability reviews considering the concept of allowable stress showed that it exceeded the allowable stress. Conclusion: Although the displacement of the tunnel has secured stability within the allowable standard, the generated stress is found to exceed the allowable standard, so it is necessary to prevent sudden stress release by applying appropriate reinforcement methods during construction.

• Journal of the Korea Society of Computer and Information
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• v.16 no.2
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• pp.257-266
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• 2011

Over the society the trial for several systems to be connected with Network has been continued to share information and to make it various. In accordance with such a change, the concept of military warfare conduction has been changing form platform centric warfare in separate combat system based on network centric warfare in network based. We have continuously made an effort that we try to get the goal with efficient system which is linked up with network, but such a study on that one in military system analysis is still slower than the study out of military until now. So this study is searching network influence factor by using military network with application of social network analysis method which is used broadly in the society and the science as well. At this time we search co-relationships between social network and the thing that we can analyse C2 time by effectiveness measurement means. By this study it has value of network influence factor identification for the growing network composition.

• Journal of the Korean Data and Information Science Society
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• v.22 no.4
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• pp.741-753
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• 2011

We accomplish clustering analyses for yeast cell cycle microarray expression data. We compare model-based clustering, K-means, PAM, SOM and hierarchical Ward method with yeast data. As the validity measure for clustering results, connectivity, Dunn Index and silhouette values are computed and compared.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.5
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• pp.47-55
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• 2019

The army of republic of korea have been continued to transform their logistics support system structure for better efficient logistics support system in preparation for the future environment. Logistics system has supply network structure which is connected by various units and supply network structure received attention as a factor of success of supply network. Many researchers have continuously researched inventory management, transportation or economy factors for supply network, but such a study on the one in military supply network structure analysis is still slower than the study of analysis of other factors until now. In this study, we identify military supply network structure influence factor by application of social network analysis method which is used broadly and analyze co-relationships between supply network structure influence factor and valued APL(average path length) as a criteria of efficiency of military supply network. By this study it has value of military supply network influence factor identification for the better military supply network fabrication.

• Proceedings of the KIPE Conference
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• 2019.07a
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• pp.254-256
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• 2019

본 논문은 파워셀 구조를 기반으로 설계된 양극성 펄스 전원장치에 대하여 소개한다. 파워셀은 풀브릿지 구조를 기반으로 설계되었으며, 833V를 출력하는 각 셀이 직렬로 연결되어 고전압을 생성하는 구조를 갖는다. 모든 파워셀의 방전 스위치를 구동하기 위해서 절연된 전력과 신호의 동시공급이 가능한 게이트 회로 구동방안이 제안되었다. 양극성 펄스 출력을 위한 파워셀의 각 래그의 단락을 방지하기 위한 게이트 회로가 설계되었다. 설계된 양극성 펄스 파워 모듈레이터의 동작을 검증하기 위해 테스트 회로가 구현되었다. 시험회로는 출력전압, 펄스 폭, 반복률 가변 조건에서 테스트 되었으며, 이를 통해 제안하는 양극성 펄스 파워 모듈레이터의 구조 및 게이트 구동회로의 신뢰성이 검증되었다.

• Korea journal of population studies
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• v.22 no.1
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• pp.65-91
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• 1999

이 연구의 목적은 북한 지역체계의 특징을 이해하고, 남북한 국토공간을 하나의 기능적 단위로 통합할 수 있는 방안을 모색하는데 있다. 북한의 지역체계는 도시간 분화, 상호의존, 그리고 대도시 지배를 주요내용으로 하였으며, 자료의 제한으로 인하여 탐색적 차원에서 연구를 진행하였다. 북한의 지역체계는 개성-평양-신의주를 연결하는 서부축, 원산-청진 -나진·선봉을 연결하는 동해안축, 그리고 희천-강계-만포를 연결하는 내륙축으로 구성되어 있는 것으로 보인다. 북한의 도시는 서부지역 도시를 제외하고는 분화의 정도가 상대적으로 낮고, 도시간 상호의존도 또한 낮은 것으로 보인다. 다만 북한의 경우도 평양이 종주도시화 되었으며, 수위도시인 평양이 북한 전역의 도시를 직접 통제·조정하는 것으로 보인다. 이는 북한이 고도의 중앙집권적 사회주의 경제체제라는 점 그리고 '자족적' 도시발달을 추구하였다는 점과 부합된다. 이 연구에서는 균형성(통합성), 대외연계성, 그리고 효율성을 원칙으로 남북한 지역의 기능적 통합 방안을 단계적으로 제시하였다 중단기적으로 북한의 동해안축을 연결시키며, 장기적으로는 남한의 동해안축을 개발하여 국토공간의 균형적 발달을 도모하는 것이 바람직하다고 본다.

• The Korean Journal of Applied Statistics
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• v.34 no.1
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• pp.25-38
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• 2021

Recently the need for network surveillance to detect abnormal behavior within dynamic social networks has increased. We consider a dynamic version of the degree corrected stochastic block model (DCSBM) to simulate dynamic social networks and to monitor for a significant structural change in these networks. To apply a control charting procedure to network surveillance, in-control model parameters must be estimated from the Phase I data, that is from historical data. In network surveillance, however, there are many situations where sufficient relevant historical data are unavailable. In this paper we propose a self-starting Shewhart control charting procedure for detecting change in the dynamic networks. This procedure can be a very useful option when we have only a few initial samples for parameter estimation. Simulation results show that the proposed procedure has good in-control performance even when the number of initial samples is very small.