• The Journal of Korean Institute of Next Generation Computing
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• v.15 no.4
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• pp.80-88
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• 2019

Software Defined Networking (SDN) is the future network paradigm of decoupling control and data functions. In SDN structure, it is hard to address scalability in case of large-scale networks because single controller managed thousands of switches in a centralized fashion. Most of previous studies have focused on horizontal scalability, where distributed controllers are assigned to network devices. However, they have abstracted the control plane and the application plane into a single controller. The layer of the common SDN architecture is divided into data plane, control plane, and application plane, but the control plane and application plane have been modeled as a single controller although they are logically separated. In this paper, we propose a analytical traffic model considering the both application plane and control plane based on queuing theory. This model can be used to address scalability issues such as controller placement problem without complicated simulations.

• The Journal of Korean Institute of Next Generation Computing
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• v.14 no.5
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• pp.7-18
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• 2018

Recently, serverless computing is spotlighted. Because it supports the development of application based on micro-service. Micro-service means a small-scale service that can operate independently. Applications with micro-service units have the advantage of enabling individual updates, easy and fast deployment. In addition, it has the advantage of supporting various languages and platforms for each service. Therefore many enterprise are trying to change from monolithic architecture to micro-service based architecture. However, there is a lack of research on methods and baseline for micro-service construction. In this paper, a method is proposed to construct the micro-service unit by analyzing UML design in monolithic application. It also shows the proposed approach can reconstruct monolithic application into micro-service based unit by implementing the constructed micro-services in a real serverless platform environment. In addition, the results of the comparative evaluation with the related studies are presented.

• The KIPS Transactions:PartC
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• v.17C no.3
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• pp.243-250
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• 2010

Vehicular communication networking is one of the most important building blocks of Intelligent Transportation System (ITS). The vehicular communication network is a wireless communication system enabling vehicles to communicate with each other as well as with roadside base stations. Mobility management of vehicles which move at high speeds and occasionally make a long journey is an interesting research area of vehicular communication networks. Recently, The Proxy Mobile IPv6 (PMIPv6) protocol is proposed for network-based mobility management to reduce the overhead of mobile nodes. PMIPv6 shifts the burden of the mobility management from mobile nodes to network agents to decrease the overhead and latency for the mobility management. In this paper, we derive the scenario of deploying PMIPv6 in vehicular communication networks and propose a new LMA handover mechanism for realizing the scenario. By carrying out the ns-2 based simulations, we verify the operability of the proposed mechanism.

• Journal of the Korea Computer Industry Society
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• v.5 no.5
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• pp.761-770
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• 2004

The multicarrier direct sequence code-division (MC-DS/CDMA) is a well-known multiple access and data transmission scheme that is applicable for various mobile and wireless communications. Particularly for modern, smart vehicles equipped with multiple sensors, MC-DS/CDMA is one of the possible means for giving the sensors to get connected one another for sending and receiving messages and control information. For intra-vehicalur communicaiton and networking applications, we have proposed a novel MC-DS/CDMA multiple access and data transmission scheme incorporating a new idea of inserting sub-symbol based cyclic prefixes for compromising inter-symbol interference. In the performance investigation of our MC-DS/CDMA, we have looked into system performances related to bandwidth utiltzation, coding gain, and multiple number of sensors. Since the channel delay is comparatively shorter inside of vehicle than any other general mobile channels, the proposed scheme can be a successful candidate for networking wireless sensors simultaneously operting in an intelligent vehicle.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.39B no.6
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• pp.397-405
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• 2014

Software-Defined Networking (SDN), which separates the control plane from the data plane and manages data planes in a centralized way, is now considered as a future networking technology, and many researchers and practitioners have dived into this area to devise new network applications, such new routing methods. Likewise, network security applications could be redesigned with SDN, and some pioneers have proposed several interesting network security applications with SDN. However, most approaches have just reimplemented some well-known network security applications, although SDN provides many interesting features, They didn't effectively use them. To investigate if we can use SDN in realizing sophisticated network security applications, we have designed and implemented an advanced network security application, Reflectornet, which redirects malicious or suspicious network trials to other security monitoring points (e.g., honeypot). In addition, we have tested its performance and practicability in diverse angles. Our findings and some insights will encourage other researchers to design better or intelligent network security applications with SDN.

• Proceedings of the Korean Information Science Society Conference
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• 2003.04d
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• pp.220-222
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• 2003

IPv6 프로토콜은 차세대인터넷에서 사용될 것이고 이미 실용화 단계에 와 있다 관련 기술의 표준화와 기본 네트워킹 장비개발 등은 어느 정도 이루어진 상태이나, 망을 적극 활용할 수 있는 응용의 부재로 사용자 및 ISP들의 적극적인 사용을 이끌어내지 옷하고 있는 실정이다. 이에, 본 논문에서는 IPv6 활성화를 위해 최근 전자통신연구원에서 개발한 IPv6 기반의 비디오 스트리밍 시스템의 설계 및 구현 내용과 6TALK[7]을 이용한 IPv6 서비스 예제를 소개하며, 트랜스유라시아망(TEIN)[6]을 이용한 한-EU간의 국제 시연 내용을 소개한다.

• Journal of Korea Multimedia Society
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• v.6 no.3
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• pp.496-507
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• 2003

Rapidly increasing Internet traffic demands require IP protocol based on high quality networking technology. Accordingy, our Internet has evolved from best-effort service toward differentiated service framework so as to implement QoS as prerequisite to a series of new applications. In addition, it is forecasted that existing transport network will be reorganized into DWDM-based optical Internet sooner or later under the influence of Internet demands for higher bandwidth based on QoS. This study shows a way to an effective implementation in some aspects: QoS implementation on DWDM-based optical Internet network, control protocol, backbone network architecture and switching technology for the Next Generation Internet (NGI).

• Electronics and Telecommunications Trends
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• v.19 no.3 s.87
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• pp.125-135
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• 2004

차세대 통신망 기술은 개별망에서 단일망인 광대역통합망으로 발전되어 가고 있는 추세이며, 향후 유. 무선 통합 및 방송. 통신 융합이 가능한 IP 기반의 멀티네트워크로 통합될 것이다. 본 고에서는 우리나라가 주도하고 있는 국내, 국제 연구망과 해외 여러 나라들이 추진하고 있는 연구개발망에 대해 살펴보고 첨단 연구개발망을 활용하여 연구개발하고 있는 주요 사항들 즉, IPv6, Measurement, Multicasting, VoIP 같은 네트워킹 기술과 바이오, 나노, 의료, 기상, 교육, 환경 연구 등 과학기술 전반에 걸쳐 6T를 포괄하는 첨단기술을 연구하는 연구개발망에 대한 동향 분석과 IT 분야의 핵심기술과 인프라 제공을 위한 BcN 기반의 연구시험망 구축 방안에 대해 살펴본다. 이러한 첨단 연구개발망은 지속적인 성장과 글로벌시대의 고부가가치 창출을 위한 차세대 연구망으로 미래 선도기술을 배양하는 역할을 수행하는 핵심기술개발과 상용화와 연구개발 기술간의 격차를 줄임으로써 개발기간의 단축과 가격경쟁력을 향상시킬 것으로 사료된다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2014.05a
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• pp.724-727
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• 2014

This paper is analyzing the situation of the Internet of Things Industry and draw the policy implications to promote Internet of Things industry. Major IT companies as Apple, Google, IBM, Sony, and Samsung have developed various smart glass and smart watch as a Iot products. In order to promote Iot Industry, we should take the build up of eco system between IT makers and the various contents provider, protection of personal information and data, development of killer applications and business models, and the conversion from IPv4 to IPv6 as a next internet address infra, build up of international standard platform on IoT.

• Information and Communications Magazine
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• v.31 no.6
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• pp.32-38
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• 2014

소프트웨어기반의 네트워크 미들박스 시스템은 특정 하드웨어의 종속성을 탈피하고, 다양한 여러 기능을 유연하게 제공할 수 있는 장점이 있어 최근 큰 각광을 받고 있다. 더욱이 최근 멀티코어 및 매니코어 프로세서의 발전 및 큰 대역폭을 지원하는 네트워크 카드의 등장은 저렴한 범용 컴퓨팅 하드웨어 기반에서도 높은 성능의 미들박스 서비스를 소프트웨어만으로 쉽게 제공할 수 있는 가능성을 보여주고 있다. 하지만 기존의 소프트웨어기반 네트워크 미들박스 시스템 개발에서 쓰이는 네트워킹 소프트웨어 스택은 여러 미들박스 서비스를 쉽게 만들고 유지하기에 불편한 점이 많이 있다. 첫째로, 리눅스(Linux)와 같은 범용 운영체제는 버클리 소켓(Berkeley socket)과 같이 엔드 노드를 위한 네트워킹 스택을 지원하는 반면 네트워크 미들박스 서비스 제작을 위한 전용 스택은 지원하지 않고 있다. 이로 인해 미들박스에서 많이 쓰는 플로 관리 같은 기능을 IP 패킷처리부터 새로 구현해야 하는 부담이 생긴다. 두번째로, 전용 스택의 부재는 같은 기능을 갖는 여러 미들박스 서비스가 공존할 때에도 그 구현을 공유하지 못하는 문제를 만들어 낸다. 또, 여러 미들박스 서비스가 하나의 물리적 하드웨어 위에서 수행될 경우에도 인터페이스가 일정하지 않아 같은 연산을 중복 수행해 자원 낭비를 초래한다. 본 논문에서는 차세대 소프트웨어기반 미들박스 서비스 설계 및 제작을 용이하게 하기 위한 전용 소프트웨어 스택의 필요성을 알아보고, 이런 전용 스택이 만들어 낼 수 있는 여러 가능성을 짚어본다.