• 한국IT서비스학회:학술대회논문집
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• 2003.05a
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• pp.242-246
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• 2003

본 논문은 지역 발전소의 통신실에 설치된 시스템 장비와 부대 시설을 원격으로 관리할 수 있는 통합 솔루션의 구축 방법을 제시한다. 최근에 각종 건물과 시설의 통신 시스템 장비들을 하나로 묶는 통합 관리 시스템은 원활한 유지 보수와 안정적인 운용을 위해서 필수적이 되고 있다. 본 논문에서 제시한 시스템은 지역 발전소의 통신실에 구축되어 있는 유닉스 서버, 라우터, 스위칭 허브 등의 장비를 원격 감시하여 필요한 정보를 추출하고 이를 본사 통신실의 네트워크 관리 시스템으로 자동 전송한다. 본사 통신실의 네트워크 관리 시스템은 이러한 정보를 실시간으로 수집하여 데이터베이스 서버에 기록하고 기록된 정보를 각종 형태로 가공하여 관리자에게 제공한다. 본 논문은 또한 이러한 통합 관리 시스템의 실제 적용 사례를 보여준다.

• Annual Conference of KIPS
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• 2016.04a
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• pp.133-135
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• 2016

현재 클라우드 네트워크는 복잡성 및 거대한 규모로 인해 기존 네트워크와는 차별화된 양상을 보이고 있다. 하드웨어 기반 보안 장비로만 보안 서비스를 제공하기에는 한정적 자원을 고려하였을 때 한계가 있으며, 온 디맨드 서비스와 멀티 테넌시로 인한 동적인 네트워크 환경은 관리자가 외부의 보안 위협뿐만 아니라 내부의 위협도 고려해야하도록 만든다. 본 논문에서는 SDN과 NFV를 이용하여 언급한 문제점들을 해결하고, 효과적인 보안 서비스를 제공할 수 있는 방법론을 제시하도록 한다.

• ETRI Journal
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• v.33 no.2
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• pp.279-282
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• 2011

Coexistence analysis is extremely important in examining the possibility for spectrum sharing between orthogonal frequency-division multiplexing (OFDM)-based international mobile telecommunications (IMT)-Advanced and other wireless services. In this letter, a new closed form method is derived based on power spectral density analysis in order to analyze the coexistence of OFDM-based IMT-Advanced systems and broadcasting frequency modulation (FM) systems. The proposed method evaluates more exact interference power of IMT-Advanced systems in FM broadcasting systems than the advanced minimum coupling loss (A-MCL) method. Numerical results show that the interference power is 1.3 dB and 3 dB less than that obtained using the A-MCL method at cochannel and adjacent channel, respectively. This reduces the minimum separation distance between the two systems, which eventually saves spectrum resources.

• Journal of Communications and Networks
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• v.6 no.2
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• pp.156-162
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• 2004

In recent years, mobile ad-hoc networks have received a great deal of attention in both academia and industry to provide anytime-anywhere networking services. As wireless networks are rapidly deployed, the security of wireless environment will be mandatory. In this paper, we describe a group key management architecture and key agreement protocols for secure communication in mobile ad-hoc wireless networks (MANETs) overseen by unmanned aerial vehicles (UAVs). We use implicitly certified public keys method, which alleviates the certificate overhead and improves computational efficiency. The architecture uses a two-layered key management approach where the group of nodes is divided into: 1) Cell groups consisting of ground nodes and 2) control groups consisting of cell group managers. The chief benefit of this approach is that the effects of a membership change are restricted to the single cell group.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.58 no.10
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• pp.2052-2058
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• 2009

The standardized and open information model called common language and information exchange format should be firstly defined for the interoperable power system and two-way information exchange among the components of the power system. The information models and information exchange formats for power facilities and power system applications are being defined in power system area, but the information model and information exchange format for the consumer area are not being yet defined besides of metering information model. An architecture and open standard for the information exchange between energy service provider and consumer are required to provide various value added services through the networking with devices in consumer premise. In this paper, an architecture for the two-way communications between energy service provider and consumer is defined and psXML(power system XML) for the information exchange is designed.

• Journal of KIISE:Information Networking
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• v.27 no.3
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• pp.278-287
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• 2000

본 논문은 무선 ATM 서비스의 핸드오버 처리를 위한 경로 재구성 방법에 대한 것으로써 경로 재구성을 위한 교차 스위치의 신속한 검색을 위하여 경로 연혁정보를 활용하는 방법을 제안하였다. 본 방법에서는 단말로부터 핸드오버가 욕되는 시점에서 현재의 연결에 대한 경로정보를 전달 받아 경로 연혁정보에서 일치되는 교차 스위치를 찾아 직접 경로 재구성을 위한 신호정보를 전달함으로써 경로 재구성 처리시간을 단축시킬 수 있다. 그리고 핸드오버 과정에서의 셀 순서 유지와 유실을 방지하기 위하여 기지국에서 관리하는 버퍼 사용방법을 사용하였다.

• Journal of Information Processing Systems
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• v.16 no.4
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• pp.896-914
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• 2020

With the rapid growth of network traffic, a large number of connected devices, and higher application services, the traditional network is facing several challenges. In addition to improving the current network architecture and hardware specifications, effective resource management means the development trend of 5G. Although many existing potential technologies have been proposed to solve the some of 5G challenges, such as multiple-input multiple-output (MIMO), software-defined networking (SDN), network functions virtualization (NFV), edge computing, millimeter-wave, etc., research studies in 5G continue to enrich its function and move toward B5G mobile networks. In this paper, focusing on the resource allocation issues of 5G core networks and radio access networks, we address the latest technological developments and discuss the current challenges for resource management in 5G.

• Proceedings of the Korean Society for Information Management Conference
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• 2015.08a
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• pp.121-125
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• 2015

SNS(Social Networking Service)의 활용률이 높은 현대 사회에서 광범위하게 사용되고 있는 SNS 마케팅은 도서관계에서는 범위 및 확산되는 속도가 다른 영역에 비해 느리다. 이를 분석하기 위한 국내의 연구들이 있었지만 SNS 마케팅이 활성화되어 있는 해외의 사례에 비해 적은 국내의 자료로 인해 난항을 겪고 있음에 주목하였다. 특히 국내외 대학도서관의 SNS 마케팅 현황을 관찰하고 이를 확산 이론과 연결하는 것을 통해 다시 한번 현재 상황을 분석하였다.

• Annual Conference of KIPS
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• 2013.11a
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• pp.698-701
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• 2013

Mobile social networking applications are getting increasingly popular among today's mobile applications. Mobile users find their old or new friends anywhere or anytime through mobile social network (MSN) services. MSN uses matchmaking mechanisms to discover mutual interests among different people. To discover friends in MSN, a user must share his/her private information which can be a risk for his/her personal privacy as this information can be learned by a malicious or semi honest user. In this paper we give a brief survey on MSN that includes MSN categories, components, architecture and applications. In the rest of the paper we discuss the matchmaking protocols. Finally we give some suggestions to improve the previous protocols.

• Journal of Information Processing Systems
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• v.17 no.1
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• pp.163-177
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• 2021

Many methods of discovering social networking communities or clustering of features are based on the network structure or the content network. This paper proposes a community discovery method based on topic models using a time factor and an unsupervised clustering method. Online community discovery enables organizations and businesses to thoroughly understand the trend in users' interests in their products and services. In addition, an insight into customer experience on social networks is a tremendous competitive advantage in this era of ecommerce and Internet development. The objective of this work is to find clusters (communities) such that each cluster's nodes contain topics and individuals having similarities in the attribute space. In terms of social media analytics, the method seeks communities whose members have similar features. The method is experimented with and evaluated using a Vietnamese corpus of comments and messages collected on social networks and ecommerce sites in various sectors from 2016 to 2019. The experimental results demonstrate the effectiveness of the proposed method over other methods.