• KSII Transactions on Internet and Information Systems (TIIS)
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• 제10권2호
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• pp.522-541
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• 2016

Network virtualization provides an effective way to overcome the Internet ossification problem. As one of the main challenges in network virtualization, virtual network embedding refers to mapping multiple virtual networks onto a shared substrate network. However, existing heuristic embedding algorithms evaluate the embedding potential of the nodes simply by the product of different resource attributes, which would result in an unbalanced embedding. Furthermore, ignoring the hops of substrate paths that the virtual links would be mapped onto may restrict the ability of the substrate network to accept additional virtual network requests, and lead to low utilization rate of resource. In this paper, we introduce and extend five node attributes that quantify the embedding potential of the nodes from both the local and global views, and adopt the technique for order preference by similarity ideal solution (TOPSIS) to rank the nodes, aiming at balancing different node attributes to increase the utilization rate of resource. Moreover, we propose a novel two-stage virtual network embedding algorithm, which maps the virtual nodes onto the substrate nodes according to the node ranks, and adopts a shortest path-based algorithm to map the virtual links. Simulation results show that the new algorithm significantly increases the long-term average revenue, the long-term revenue to cost ratio and the acceptance ratio.

• 한국컴퓨터정보학회논문지
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• 제27권9호
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• pp.101-112
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• 2022

본 논문에서는 5G 네트워크 슬라이싱에 대해서 분석하고 5G 이동 통신망에서의 효율적인 네트워크 슬라이스 설정 방안을 제안한다. 5G 이동 통신망에서 네트워크 슬라이싱은 네트워크 슬라이스 인스턴스 정보에 기반하여 구분되고 수행된다. 단말과 네트워크 간의 네트워크 슬라이스 인스턴스 정보가 상호 일치하지 않는 경우, 단말의 PDU 세션 연결 요청 실패에 따른 불필요한 시그널링 오버헤드가 발생한다. 본 논문은 이러한 문제를 해결하기 위해서, 두 가지 효율적인 네트워크 슬라이스 설정 기법, 단말 기반 ENSC(Efficient Network Slice Configuration) 기법과 네트워크 기반 ENSC 기법을 제안한다. 제안하는 두 가지 기법들은 신속한 단말과 네트워크 간의 최신 변경 업데이트된 네트워크 슬라이스 정보를 제공 설정 수행하게 되어, 기존 방안과 비교하여 배터리 리소스 효율성을 향상시키고 불필요한 시그널링 오버헤드를 최소화할 수 있다.

• 한국경영과학회지
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• 제36권4호
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• pp.1-16
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• 2011

It is important not only to introduce the C4I(Command and Control, Communication, Computer, Intelligence) system for realizing the NCW(Network Centric Warfare) but also to evaluate the synergistic effect by the C4I system. However, the study effort for evaluating the system's synergistic effect is insufficient compared with introducing the system. Therefore, in this paper, we proposed a model that measures the synergistic effect of combat power by the warfare information system. To measure the synergistic effect of warfare information system, the network power must be considered, so we also proposed a new methodology for measurement of network power based on SNA(Social Network Analysis), not Metcalfe's law. A model we proposed is a model that measures the raised combat power by the network effectiveness. The methodology and model we proposed in this paper will be used usefully to analyze the practical effect of constructing future warfare information system.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2014년도 추계학술발표대회
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• pp.849-852
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• 2014

Reverse engineering of gene regulatory network is a challenging task in computational biology. To detect a regulatory relationship among genes from time series data is called reverse engineering. Reverse engineering helps to discover the architecture of the underlying gene regulatory network. Besides, it insights into the disease process, biological process and drug discovery. There are many statistical approaches available for reverse engineering of gene regulatory network. In our paper, we propose pairwise mutual information for the reverse engineering of a gene regulatory network from time series data. Firstly, we create random boolean networks by the well-known $Erd{\ddot{o}}s-R{\acute{e}}nyi$ model. Secondly, we generate artificial time series data from that network. Then, we calculate pairwise mutual information for predicting the network. We implement of our system on java platform. To visualize the random boolean network graphically we use cytoscape plugins 2.8.0.

• 한국정보기술학회 영문논문지
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• 제9권2호
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• pp.55-63
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• 2019

Vehicle communication networks have some deficient network resources to support a vast multimedia service including safety driving information, video, news and some broadcast relayed from the playgrounds such as professional baseball games for autonomous vehicles. This paper deals with the framework for providing seamless multimedia service including safety driving information using multicast in cooperated-connected vehicle communication network (CVCN). It adopts smart-switch (SS) and smart intelligent multicast agent(SIMA) to support the seamless multimedia service. The SS manages and switches multimedia streams through SIMA in CVCN network. The SIMA to operate as an access point, is composed of multicast supporting part and control part of mobile devices/autonomous vehicles in CVCN network. Therefore this proposed technique using SS and SIMA within CVCN network is a new framework for multimedia service that can disperse the load of server.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제10권10호
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• pp.4902-4932
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• 2016

The popularity of network virtualization has recently regained considerable momentum because of the emergence of OpenFlow technology. It is essentially decouples a data plane from a control plane and promotes hardware programmability. Subsequently, OpenFlow facilitates the implementation of network virtualization. This study aims to provide an overview of different approaches to create a virtual network using OpenFlow technology. The paper also presents the OpenFlow components to compare conventional network architecture with OpenFlow network architecture, particularly in terms of the virtualization. A thematic OpenFlow network virtualization taxonomy is devised to categorize network virtualization approaches. Several testbeds that support OpenFlow network virtualization are discussed with case studies to show the capabilities of OpenFlow virtualization. Moreover, the advantages of popular OpenFlow controllers that are designed to enhance network virtualization is compared and analyzed. Finally, we present key research challenges that mainly focus on security, scalability, reliability, isolation, and monitoring in the OpenFlow virtual environment. Numerous potential directions to tackle the problems related to OpenFlow network virtualization are likewise discussed.

• 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.

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 2005년도 추계학술발표회
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• pp.997-998
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• 2005

• 한국정보통신학회논문지
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• 제3권2호
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• pp.245-253
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• 1999

본 논문에서는 수산업을 주산업으로 하고 있는 통영지역의 정보활성화에 대하여 연구하였다. 그리고 정보의 효용가치를 극대화시키기 위한 방안으로 해양정보망, 수산정보망, 수산유통정보망 등 세 가지의 네트워크 모델을 제시하였다. 해양정보망에서는 해양환경 및 해양생물의 정보화에 대해서, 수산정보망에서는 어업 및 양식업의 정보화에 대해서, 수산유통정보망에서는 양식 및 일반 어류유통의 정보화에 대한 방안을 제시하였다. 각 정보망에서 수집된 자료는 실시간으로 처리하여 최종 사용자가 항상 최신의 자료를 사용할 수 있도록 Web 기반에서의 서비스를 구현하였다.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 1999년도 춘계종합학술대회
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• pp.70-77
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• 1999

본 논문에서는 수산업을 주산업으로 하고 있는 통영지역의 정보활성화에 대하여 연구하였다. 그리고 정보의 효용가치를 극대화시키기 위한 방안으로 해양정보망, 수산정보망, 수산유통정보망 등 세 가지의 네트워크 모델을 제시하였다. 해양정보망에서는 해양환경 및 해양생물의 정보화에 대해서, 수산정보망에서는 어업 및 양식업의 정보화에 대해서, 수산유통정보망에서는 양식 및 일반 어류유통의 정보화에 대한 방안을 제시하였다. 각 정보망에서 수집된 자료는 실시간으로 처리하여 최종 사용자가 항상 최신의 자료를 사용할 수 있도록 Web 기반에서의 서비스를 구현하였다.