• The Korean Journal of Applied Statistics
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• v.29 no.6
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• pp.1117-1128
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• 2016

In genetic association studies with high-dimensional genomic data, regularization procedures based on penalized likelihood are often applied to identify genes or genetic regions associated with diseases or traits. A network-based regularization procedure can utilize biological network information (such as genetic pathways and signaling pathways in genetic association studies) with an outstanding selection performance over other regularization procedures such as lasso and elastic-net. However, network-based regularization has a limitation because cannot be applied to high-dimension genomic data with a group structure. In this article, we propose to combine data dimension reduction techniques such as principal component analysis and a partial least square into network-based regularization for the analysis of high-dimensional genomic data with a group structure. The selection performance of the proposed method was evaluated by extensive simulation studies. The proposed method was also applied to real DNA methylation data generated from Illumina Innium HumanMethylation27K BeadChip, where methylation beta values of around 20,000 CpG sites over 12,770 genes were compared between 123 ovarian cancer patients and 152 healthy controls. This analysis was also able to indicate a few cancer-related genes.

• International Commerce and Information Review
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• v.14 no.2
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• pp.55-79
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• 2012

The previous studies based on a resource-based view of firm highlighted the role of resources within a firm in creating and sustaining competitive advantage. Recent research, however, the relational view points to the importance of inter-firm sources(or relational capital) in creating firm competitiveness. In international business field, the studies on born-global firms also states that when firms are lack of ownership-specific advantages in their internationalization process, they resort to the external partners and social networks to complement their resource scarcity. By adopting the relational view and born-global firms concept, a network-based approach needs to be applied to explain the international strategy of Korean service firms. This is because most of Korean service firms own less ownership-specific advantages than global competitors. This study proposes Korean firms' global network building and exploiting strategy to enhance their international stages of development. The network, for example, Global Korean Tourism Network, enables network members access to the valuable resources and capabilities they are lack of when undergoing internationalization process. This study's contribution is along two dimension. First, even global Korean network is emerging as a major issue in recent years, we could not figure out how to build global Korean network for service firms. This studies gives an answer. Second, we derived what benefits can be gained from the network if Global Korean Tourism Network is developed for hotel, tourism, convention firms' internationalization.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2022.06a
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• pp.221-223
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• 2022

최근 CNN(Convolutional Neural Network)은 초해상화(super-resolution)를 포함한 다양한 컴퓨터 비전 분야에서 우수한 성능을 보이며 널리 사용되고 있다. 그러나 CNN은 계산 집약적이고 많은 메모리가 요구되어 한정적인 하드웨어 자원인 모바일이나 IoT(Internet of Things) 기기에 적용하기 어렵다는 문제가 있다. 이런 한계를 해결하기 위해, 기 학습된 깊은 CNN 모델의 성능을 최대한 유지하며 네트워크의 깊이나 크기를 줄이는 경량화 연구가 활발히 진행되고 있다. 본 논문은 네트워크 경량화 기술인 지식증류(knowledge distillation) 중 자가증류(self-distillation)를 초해상화 CNN 모델에 적용하여 성능을 평가, 분석한다. 실험 결과, 정량적 평가지표를 통하여 자가증류를 통해서도 성능이 우수한 경량화된 초해상화 모델을 얻을 수 있음을 확인하였다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.23 no.12
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• pp.1720-1725
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• 2019

In this paper, we consider the efficiency of the scheme for for routing summary algorithms in discontiguous networks. Router than updating and transmitting the entire subnet information in the routing protocol, only the shortened update information is sent and the routing table is shortened to make the router resources more efficient and improve network stability and performance. However, if a discontiguous network is formed in the network design process, a problem arises due to the network contraction function and does not bring about the result of fundamental router efficiency. Using different major networks subnets one major network, causing problems in communication and routing information exchange if the configuration is incorrect. The algorithm proposed in this paper removes only the auto-summary algorithm from the existing algorithm, which increases the complexity and stability of the routing table and reduces the CPU utilization of network equipment from 16.5% to 6.5% Confirmed.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.14 no.9
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• pp.2150-2156
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• 2010

We focus on the network itself and its ability to enable efficient and effective information flow. All networks are complex to a greater degree, including military command and control systems operating in a network-centric environment. It requires to understand the nature of complexity, what its effects are, and how to quantify them. In this paper, we present the beneficial effects of information accessibility and network-based redundancy into a single metric.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.04a
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• pp.744-747
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• 2011

센서 네트워크는 다수의 센서노드를 통해 특정한 요청에 대한 정보를 수집하고 공유하는 네트워크이다. 센서 네트워크에는 많은 수의 센서들이 존재하기 때문에 센서노드를 관리하고 모니터링 하기 위한 효율적인 방법이 필요하다. 센서 네트워크에 IPv6를 적용한 기술로써 6LoWPAN이 있다. SNMP 사용 등 IP를 이용함으로 얻을 수 있는 다양한 장점이 있지만 센서의 배터리 용량과 메시지 사이즈가 제한적이기 때문에 메시지 사이즈가 큰 기존의 SNMP를 그대로 적용하기는 어렵다. 따라서 센서 네트워크에서 제한된 배터리 용량과 메시지 사이즈에 적용할 수 있는 효율적인 네트워크 기법이 필요하다. 본 논문에서는 네트워크 관리 프로토콜인 SNMP를 경량화 하여 6LoWPAN 환경에서도 적합한 방안을 제안하였다. 특히, SNMP 버전 중 SNMPv1, v2보다 보안성이 강화된 SNMPv3을 경량화 하여 6LoWPAN에 적합하고 보안적인 네트워크 관리를 위한 기법을 제안한다.

• The Journal of the Korea Contents Association
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• v.13 no.4
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• pp.86-96
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• 2013

This study is about utilizing social game as a gamification advertising platform. Since iPhone released to the world, the smart phone industry has rapidly increased. And the development of the smart phone industry has rapidly increased its rate of users in which it has led to leaping growths of new kind of service such as SNS(Social Network Service), and SNG(Social Network Game). The purpose of this study is predicting the development of advertising industry in smart phone paradigm shift. This study focused on social network game as a gamification advertising platform, and studied on case of which is social network game used as a gamification advertising platform. Finally, this study has developed suggestions for new way of advertising by utilizing Mobile social network game as a gamification advertising platform.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.28 no.10B
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• pp.899-915
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• 2003

Delivering rich and continuous media contents robustly over a wide range of network conditions of the wired/wireless Internet is a highly challenging task. To address this challenges, the continuous media applications at the edge of network has become more and more adaptive while the best-effort Internet is slowly progressing towards improved networking services. That is, the role of network adaptive media delivery, which dynamically links the quality demand of application contents to the underlying networking services, has become more crucial. In this paper, we will first review the required network adaptation functionalities seen from the application side: congestion control / rate control, error control, and synchronization / adaptive playout. Then, we start the coverage of networking support issues that helps the realization of network adaptive media streaming - from network support and protocol support toward consolidated support via middleware. Finally, we propose a dynamic network adaptation framework that efficiently leverages its awareness of both media application (including contents) and underlying networking support.

• KDI Journal of Economic Policy
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• v.17 no.1
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• pp.3-49
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• 1995

한국경제의 선진권진입(先進圈進入)은 국민이 선진국의 생활수준을 향유할 수 있는 국가경쟁우위(國家競爭優位)의 확보를 의미한다. 국가경쟁우위를 확보하기 위해서는 (1)국내기업의 핵심역량(核心力量)이 배양되고 과학기술하부구조(科學技術下部構造)가 확충되는 등 지식집약산업의 중추기능(中樞機能)이 집적되어야 하고, (2)정보공유(情報共有)와 공동학습(共同學習)을 실현하는 혁신주체간의 네트워크도 형성되어야 한다. 세계기업(世界企業)을 지향하는 국내기업들이 90년대에 무형경영자산(無形經營資産)에 대한 장기투자를 확대하기 시작하여, 2000년대에는 핵심역량의 축적이 가속될 것이며, 2010년대에는 한국계 다국적기업 중에서 기업내(企業內) 세계분업(世界分業)을 전개하는 초우량기업(超優良企業)이 나타날 것이다. 2010년대에는 초우량기업을 중심으로 연구개발(硏究開發)네트워크와 생산분업(生産分業)네트워크가 구축되고 과학기술하부구조가 확충되는 등 세계기업이 고부가활동(高附價活動)(상품기획 연구개발 엔지니어링 등)을 배치하는 입지조건(立地條件)이 구비될 것이다. 특히 차세대(次世代) 원천특허기술(源泉特許技術)의 확보를 위한 기초 응용연구의 국내기반도 확충될 것이다. 중소기업분야에서도 지식집약화에 경영자원을 집중적으로 투입하면서 세계시장을 대상으로 입지를 선정하고 네트워크를 활용하는 것이 보편화될 것이다. 중소기업의 조직화(組織化) 공동화(共同化)를 통하여 지식집약화와 세계화에 요구되는 경영자원의 축적이 가속되고 기능적 상호보완으로 혁신활동(革新活動)의 상승효과(相乘效果)를 증폭시키는 네트워크의 형성도 촉진될 것이다. 중견 중소기업의 업종은 특정지역에 군락(群落)을 이루고 기능(機能)의 집적(集積)과 네트워크의 형성을 통하여 지역산업(地域産業)으로서 세계시장에서 경쟁우위를 확보하게 될 것이다.

• Journal of Korea Multimedia Society
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• v.9 no.2
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• pp.208-214
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• 2006

Participants of a NVE(networked virtual environment) may have different hardwares and network environments, and to guarantee the fairness, messages of participants should be synchronized. A solution for the synchronization problem is to wait for a certain amount of time until the server processes the message. It is not easy to determine a suitable waiting period because of the trade-off between the fairness and the responsiveness. In this paper we propose a method to decide a waiting period by considering only the participants with small network delays and perform experiments for the performance evaluation. Experiments show that the proposed method leads to significant improvement of responsiveness, while retaining fairness.