• 한국문헌정보학회지
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• 제42권4호
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• pp.73-94
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• 2008

국내에는 약 200만명을 상회하는 다양한 유형의 장애인이 있다. 그들은 비장애인과 마찬가지로 평생학습, 사회활동, 여가향유, 사회참여를 목적으로 도서관 지식정보에 대한 접근을 필요로 한다. 이에 주목한 본 연구는 장애인을 위한 도서관서비스 협력망의 구축 및 운영방안을 제안하였다. 그리고 도서관의 장애인서비스 협력망을 가동하기 위한 후속조치도 언급하였다.

• 한국인터넷방송통신학회논문지
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• 제11권6호
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• pp.15-21
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• 2011

애드혹 네트워크에서는 협동 다이버시티를 적용하여 네트워크의 전력소모를 줄이고, 통달거리의 확장 및 시스템의 성능을 향상시키고 있다. 그러나 가장 큰 신호 대 잡음비(SNR, Signal-to-noise ratio)을 갖는 릴레이를 선택하여 송신하는 선택 릴레이 협동 다이버시티 방식은 느린 페이딩 채널에서 특정 릴레이가 계속 송신하므로 네트워크의 생존시간을 줄이게 된다. 그러므로 최근에 네트워크의 생존 시간을 늘이기 위하여 균일전력 릴레이 선택방식이 연구되었다. 본 논문에서는 소스-릴레이 및 릴레이-목적지간의 수신 신호 대 잡음비가 일정수준 이상이 되는 릴레이를 선택하여 송신할 수 있는 하는 이중 기회전송 협동 다이버시티(DOT, Double opportunistic cooperative diversity) 시스템에 균일전력 릴레이 선택방식을 적용하고 시스템의 성능을 유도하였다. 유도한 결과는 선택결합(SC, Selection combining) 방식과 최대비 합성결합(MRC, Maximal ratio combining) 방식과 비교하였다. 균일전력 릴레이 방식을 사용하였을 때 다른 방식에 비해서 시스템의 성능저하가 있었는데, 이는 네트워크의 생존 시간을 늘이기 위해서 릴레이에 균일한 송신기회를 주었기 때문으로 해석되었다.

• ETRI Journal
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• 제34권1호
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• pp.102-105
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• 2012

To serve the growing demand of the bidirectional information exchange, we propose a single relay selection (RS) scheme for physical-layer network coding (PNC) in a bidirectional cooperative network consisting of two sources and multiple relays. This RS scheme selects a single best relay by maximizing the bottleneck of the capacity region of both information flows in the bidirectional network. We show that the proposed RS rule minimizes the outage probability and that it can be used as a performance benchmark for any RS rules with PNC. We derive a closed-form exact expression of the outage probability for the proposed RS rule and show that it achieves full diversity gain. Finally, numerical results demonstrate the validity of our analysis.

• 한국정보시스템학회지:정보시스템연구
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• 제15권3호
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• pp.159-174
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• 2006

Employment rate of graduating students has been one of the most important issues at universities. Recently interest on internship abroad has been increased significantly due to globalization of the society In particular, central and local governments have developed policies and encouraged university students to participate in internships abroad. However, activities and resources for internships abroad are very limited to a few organizations. This paper investigated the current status of internship in the U.S. and Korea. Then, this paper analyzed differences in demand and supply of the internship and matching mechanism of the internship between the U.S. and Korea. From the results of those analyses, this paper developed an international network model which can help effective and efficient increase in the demand and supply of the internship as well as the internship matching mechanism in Korea. This network model utilizes international NGOs in order to develop internationally cooperative environment. This model provides mechanism for (1) effectively identifying intern applicants who like to work abroad and evaluating thent (2) effectively identifying new internship positions and evaluating companies which plan to hire interns, (3) efficiently matching demand for and supply of internship by identifying appropriate candidates, (4) monitoring companies for their quality of working conditions and interns for their qualities of work This model for internship has been applied for a NGO which is International CBMC (Christian Businessman Committee International)

• 한국항해항만학회지
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• 제38권3호
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• pp.307-315
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• 2014

This paper aims to empirically examine how shipping companies can effectively acquire knowledge from their strategic alliance partners. This paper adopts cooperative network embeddedness mechanism, such as network density and tie closeness, as a channel through which to acquire more knowledge for shipping participants within a strategic alliance network. This study also examines the moderating role of competition between alliance partners in reinforcing the effectiveness of the cooperative relationships on the knowledge acquisition. Based on the literature, hypotheses to predict the aforementioned associations between cooperative network embeddedness and knowledge acquisition and the moderating role of competition in facilitating that association are established. A quantitative research method using survey data conducted in the Korean shipping industry was employed in order to empirically test the presented hypotheses. The results show that if players in a shipping alliance network are embedded in a dense network and have close relationships with their alliance partners, this helps to facilitate a greater degree of knowledge acquisition from the partners; and the impact of network density on the knowledge acquisition would be intensified with the higher level of competition between shipping companies.

• 한국농공학회논문집
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• 제50권6호
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• pp.83-91
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• 2008

This study grasped problems and properties of rural tourism through Cooperative Tourism Development Model Project, so it provided to develop network program and to indicate long-term development direction. This study area was Gubyung-Areum village in Boeun-gun, Chungcheongbuk-do. This village has superior natural landscape and rich area theme. Also, this village was chosen in Areum Village Revitalization Project in 2002, infrastructure full equipment was achieved. Gubyung-Areum village is administering buckwheat flower festival and experience program by Bo-Eun County Office help to change the farm stay village to the rural experience village. But, there were some problems to operate in experience program. So that Chungcheongbuk-do Provincial Government Republic of Korea is propelling Cooperative Tourism Development Model Project for coping these problems from 2007.12.31 to 2008.9.30. This study is going to develop tourism network program that take advantage of enough area resources grasping problem of Gubyung-Areum village through propulsion of Cooperative Tourism Development Model Project. This study present Developing Strategies for Gubyung-Areum village through investigation, analysis and operation process.

• ETRI Journal
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• 제37권2호
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• pp.262-272
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• 2015

In particular, for a practical mobile robot team to perform such a task as that of carrying out a search and rescue mission in a disaster area, the network connectivity and localization have to be guaranteed even in an environment where the network infrastructure is destroyed or a Global Positioning System is unavailable. This paper proposes the new collective intelligence network management architecture of multiple mobile robots supporting seamless network connectivity and cooperative localization. The proposed architecture includes a resource manager that makes the robots move around and not disconnect from the network link by considering the strength of the network signal and link quality. The location manager in the architecture supports localizing robots seamlessly by finding the relative locations of the robots as they move from a global outdoor environment to a local indoor position. The proposed schemes assuring network connectivity and localization were validated through numerical simulations and applied to a search and rescue robot team.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제13권9호
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• pp.4572-4586
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• 2019

Mobile Edge Computing (MEC) and Information-Centric Networking (ICN) are essential network architectures for the future Internet. The advantages of MEC and ICN such as computation and storage capabilities at the edge of the network, in-network caching and named-data communication paradigm can greatly improve the quality of video streaming applications. However, the packet loss in wireless network environments still affects the video streaming performance and the existing loss recovery approaches in ICN does not exploit the capabilities of MEC. This paper proposes a Deep Learning based Loss Recovery Mechanism (DL-LRM) for video streaming over MEC based ICN. Different with existing approaches, the Forward Error Correction (FEC) packets are generated at the edge of the network, which dramatically reduces the workload of core network and backhaul. By monitoring network states, our proposed DL-LRM controls the FEC request rate by deep reinforcement learning algorithm. Considering the characteristics of video streaming and MEC, in this paper we develop content caching detection and fast retransmission algorithm to effectively utilize resources of MEC. Experimental results demonstrate that the DL-LRM is able to adaptively adjust and control the FEC request rate and achieve better video quality than the existing approaches.

• 한국컴퓨터산업학회논문지
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• 제6권5호
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• pp.775-782
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• 2005

무선망 서비스는 낮은 대역폭, 빈번한 끊김 현상, 패킷 전송률, 사용자의 이동성 등에 따른 많은 문제점이 발생되고 있다. 본 논문에서는 무선 망 서비스를 효율적으로 수행하기 위해 협력적 갱신 기법을 제안한다. 제안된 기법은 협력적 필터링을 이용하여 갱신을 수행하게 되며, $mbuffer_{in}$과 $mbuffer_{out}$에 의해 스트리밍이 수행된다. 시뮬레이션 결과 제안된 기법의 성능이 효율적임을 보인다.

• Journal of Communications and Networks
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• 제14권2호
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• pp.169-178
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• 2012

In this paper, we study the advantages of using range extension cooperative transmission (CT) in multi-hop energy harvesting wireless sensor networks (EH-WSNs) from the network layer perspective. EH-WSNs rely on harvested energy, and therefore, if a required service is energy-intensive, the network may not be able to support the service successfully. We show that CT networks that utilize both range extension CT and non-CT routing can successfully support services that cannot be supported by non-CT networks. For a two-hop toy network, we show that range extension CT can provide better services than non-CT. Then, we provide a method of determining the supportable services that can be achieved by using optimal non-CT and CT routing protocols for EH-WSNs. Using our method and network simulations, we justify our claim that CT networks can provide better services than nonCT networks in EH-WSNs.