• KSII Transactions on Internet and Information Systems (TIIS)
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• 제6권1호
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• pp.147-161
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• 2012

In recent years, machine-to-machine (M2M) communications are under rapid development to meet the fast-increasing requirements of multi-type wireless services and applications. In order to satisfy M2M communications requirements, heterogeneous networks convergence appears in many areas, i.e., mobile cellular networks (MCNs) and wireless sensor networks (WSNs) are evolving from heterogeneous to converged. In this paper, we introduce the system architecture and application requirement for converged MCN and WSN, where mobile terminals in MCN are acting as both sensor nodes and gateways for WSN. And then, we discuss the joint optimization of converged networks for M2M communications. Finally, we discuss the technical challenges in the converged process of MCN and WSN.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제9권10호
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• pp.4015-4033
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• 2015

The future mobile networks consist of hyper-dense heterogeneous and small cell networks of same or different radio access technologies (RAT). Integrating mobile networks of different RATs to provide seamless and smooth mobility service will be the target of future mobile converged network. Generally, handover from high-speed networks to low-speed networks faces many challenges from application perspective, such as abrupt bandwidth variation, packet loss, round trip time variation, connection disruption, and transmission blackout. Existing inter-RAT handover solutions cannot solve all the problems at the same time. Based on the high-layer convergence sublayer design, a new receiver-aided soft inter-RAT handover is proposed. This soft handover scheme takes advantage of multihoming ability of multi-mode mobile station (MS) to smooth handover procedure. In addition, handover procedure is seamless and applicable to frequent handover scenarios. The simulation results conducted in UMTS-WiMAX converged network scenario show that: in case of TCP traffics for handover from WiMAX to UMTS, not only handover latency and packet loss are eliminated completely, but also abrupt bandwidth/wireless RTT variation is smoothed. These delightful features make this soft handover scheme be a reasonable candidate of mobility management for future mobile converged networks.

• Journal of Communications and Networks
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• 제13권3호
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• pp.286-297
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• 2011

A novel converged optical network unit (ONU)-base station (BS) architecture has been contemplated for next-generation optical-wireless networks. It has been demonstrated through high quality studies that data traffic carried by both wired and wireless networks exhibit self-similar and long range dependent characteristics; attributes that classical teletraffic theory based on simplistic Poisson models fail to capture. Therefore, in order to apprehend the proposed converged architecture and to reinforce the provisioning of tightly bound quality of service (QoS) parameters to end-users, we substantiate the analysis of the QoS behavior of the ONU-BS under self-similar and long range dependent traffic conditions using custom queuing which is a common queuing discipline. This paper extends our previous work on priority queuing and brings novelty in terms of presenting performance analysis of the converged ONU-BS under realistic traffic load conditions. Further, the presented analysis can be used as a network planning and optimization tool to select the most robust and appropriate queuing discipline for the ONU-BS relevant to the QoS requirements of different applications.

• 한국시뮬레이션학회논문지
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• 제21권1호
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• pp.45-54
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• 2012

이동통신과 디지털 영상처리 기술의 발전에 의해 음성통신, WWW, e-mail, FTP 등 전통적 서비스 이외에 VoD 등 융합형서비스가 이동통신망에서도 상용화되고 있다. 이러한 융합형 서비스는 LTE-Advanced 네트워크 등 초고속 이동 통신망과 통합형 휴대 단말기를 바탕으로 U-cloud 서비스, 모바일 IP-TV 등으로 진화될 것 이다. 본 연구에서는 이종 융합 무선망에서 음성통신, VoD, 영상통화 등 실시간 서비스의 품질을 허용 가능한 수준으로 보장하면서도 무선자원의 활용도를 높여 WWW 등 기존의 비실시간 인터넷 서비스를 최대한 수용하기 위한 방안을 제안한다.

• Journal of Information Processing Systems
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• 제6권3호
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• pp.323-334
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• 2010

The broadcasting & telecommunication services in the future will be converged and be serviced on mobile devices. However, the current ICT infrastructure does not fully meet the future demand for those converged, realistic, intelligent, and personalized services. The Korean government is going to establish a high speed next generation network called UBcN (Ultra-Broadband Convergence Network) by 2013. The Korean government has announced a multi-year plan to establish an UBcN network and to discover and stimulate new converged services for an UBcN in January, 2009. The author of this paper has taken part in formulating development plans since the early stages of planning. In this paper, Korea's development plans for the next generation network and their development strategies are analyzed and discussed based on the author's experience. The paper also discusses the expected impacts of the plan for the future ICT industry, and the implications of government-driven development plans.

• 한국통신학회논문지
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• 제35권3B호
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• pp.503-516
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• 2010

본 논문에서는 유무선 통합 환경에서 융합 미디어 서비스를 제공하기 위한 통합 프로파일 및 인증 제어 기술로써, 시스템 구현을 통한 결과를 제시한다. 가입자의 접속, 서비스, 이동성, 방송형 프로파일을 관리하고 개방형 API(Application Program Interface)를 통해서 제3사업자에게 가입자 프로파일 정보를 PUSH/PULL 방식으로 제공하는 방안을 제안한다. 이때 개방형 API는 웹 서비스, REST(Representational State Transfer) 기반으로 구현하여 제3사업자가 쉽게 서비스를 제공할 수 있는 방식을 제안한다. 또한, 한번 접속 인증에 성공하면 액세스 망이 변하거나 혹은 IMS(IP Multimedia Subsystem) 기반의 서비스 망에 접속하게 될 때 동일한 인증 정보를 유지할 수 있는 SSO(Single Sign-On) 기능을 제안한다. 제안된 방식은 CUPS(Converged User Profile Server) 시험 네트워크 구현 연구를 통하여 기능 검증 및 성능 분석을 수행하였다.

• 한국경영과학회:학술대회논문집
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• 한국경영과학회 2006년도 추계학술대회
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• pp.277-280
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• 2006

This paper deals with a heuristic algorithm for solving a broadband converged access networks (BCAN) design problem. The problem is to minimize the total cost of switches and cables while satisfying demand and QoS constraints. We propose a Tabu Search (TS) algorithm for finding a good feasible solution within a reasonable time limit.

• Journal of Communications and Networks
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• 제8권4호
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• pp.422-431
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• 2006

This paper proposes an adaptive routing protocol called ARCA for converged ad-hoc and cellular network (CACN). Due to the limitation of both bandwidth and transmission range in a cell, a mobile host (MH) may not be able to make a call during busy time. CACN offers a flexible traffic diversion mechanism that allows a MH to use the bandwidth in another cell to ease the congestion problem and increase the throughput in a cellular network. Based on the presentation of CACN's physical characteristics, the paper details the design issues and operation of the adaptive routing protocol for CACN (ARCA). Detailed numerical analysis is presented in terms of both route request rejection rate and routing overhead, which, along with the simulation results, have indicated the effectiveness and efficiency of the ARCA protocol.

• 디지털융복합연구
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• 제9권1호
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• pp.61-70
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• 2011

Ultimately, this research will focus on the activity traits of future customers in the convergence age. To accomplish that, firstly, researcher develop measures for assessing the convergence level of digital devices and digital services. Next, this will investigate the behavioral traits of people who use specific devices or services on the internet or mobile networks. This study proposed five convergence measures each for devices and services. For digital devices, measures such as converged functions, accessibility to network, portability, immediate communicability, and expandibility of functions were utilized. For digital measures such as scope of users, newness, social network level, ease-of use on mobile networks, and expandibility of information were used. We believe that the research results can provide insights for those wishing to explore the convergence level of devices and services and those developing high-level converged devices and digital services.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2017년도 춘계학술대회
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• pp.747-749
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• 2017

악성코드 감염, 외부침입 등으로 인한 금융회사의 고객정보 유출, 기타 금융사고 발생에 대한 위험으로부터 금융거래를 보호하기 위해 금융위원회에서는 "금융전산 보안강화 종합대책"에서 업무망과 인터넷망 분리에 의한 안전한 금융거래와 고객정보 보호대책의 가이드라인을 제시하고 금융전산망 분리를 의무화시켰다. 이에 각 금융회사는 회사별 IT전산 환경에 맞는 물리적, 논리적 망분리 방법을 선택하여 망분리 시스템을 구축하고 있다. 본 논문은 전통적 범용장비의 구성과 최근 발전중인 가상화 기술 중 하나인 Hyper Converged를 통한 통합형 HCI(Hyper Converged Infrastructure) 방식에 대한 비교 및 사례 연구로 논리적 망분리 구축을 위한 효율적인 인프라 구성 방안을 제시한다.