• ETRI Journal
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• v.28 no.5
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• pp.593-606
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• 2006

Thanks to the great possibilities of providing different types of telecommunication traffic to a large geographical area, satellite networks are expected to be an essential component of the next-generation internet. As a result, issues concerning the designing and testing of efficient connection-admission-control (CAC) strategies in order to increase the quality of service (QoS) for multimedia traffic sources, are attractive and at the cutting edge of research. This paper investigates the potential strengths of a generic digital-video-broadcasting return-channel-via-satellite (DVB-RCS) system architecture, proposing a new CAC algorithm with the aim of efficiently managing real-time multimedia video sources, both with constant and high variable data rate transmission; moreover, the proposed admission strategy is compared with a well-known iterative CAC mainly designed for the managing of real-time bursty traffic sources in order to demonstrate that the new algorithm is also well suited for those traffic sources. Performance analysis shows that, both algorithms guarantee the agreed QoS to real-time bursty connections that are more sensitive to delay jitter; however, our proposed algorithm can also manage interactive real-time multimedia traffic sources in high load and mixed traffic conditions.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.7 no.1
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• pp.75-83
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• 2008

In this paper, we propose an efficient algorithm that assigns single temporary IPv4 address and port number to improve efficiency of IPv4 address that is allocated in DSTM service. And, we have analyzed the elementary functions for DSTM and have designed the functional modules. Also, we have implemented the DTI interface for encapsulation and decapsulation of IPv6 packets. The performance analysis and comparison are investigated whether the appropriate interworking service is possible or not. Our observation results show that the performance of IPv4 over IPv6 tunneling is suitable to DSTM service due to the reduction of delay by eliminating checksum calculations in the header of IPv6 tunneling.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.5 no.2
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• pp.371-384
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• 2001

In these days, it is continuously increased to the intrusion of system in internet environment. The methods of intrusion detection can be largely classified into anomaly detection and misuse detection. The former uses statistical methods, features selection method in order to detect intrusion, the latter uses conditional probability, expert system, state transition analysis, pattern matching. The existing studies for IDS(intrusion detection system) use combined methods. In this paper, we propose a new intrusion detection algorithm combined both state transition analysis and association mining techniques. For the intrusion detection, the first step is generated state table for transmitted commands through the network. This method is similar to the existing state transition analysis. The next step is decided yes or no for intrusion using the association mining technique. According to this processing steps, we present the automated generation algorithm of the penetration scenarios.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2002.11a
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• pp.844-848
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• 2002

In this paper, we present a VoIP service provisioning architecture based on MEGACO/H.248 which is one of the key protocols for VoIP services. MEGACO/H.248 is a media gateway control protocol standardized by both ITU-T and IETF, and many ITSPs, carriers, and vendors currently have a lot of interest in the protocol. MEGACO/H.248 is used by a softswitch a key component of the next generation VoIP network, in order to control various media gateways and provide seamless interworking between PSTN and Yon networks.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2002.05a
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• pp.90-95
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• 2002

This thesis is aiming at analysis and implementing Distance Video Lecturing System to guarantee the high quality in service through using less Network resource. Most of the usual Distance Video Lecturing System has been designed not in the system of Multiuser Conference but Point-to-Point. But from now on Distance Video Lecturing System is to be demanded on not only the expansion to Multiuser Distance Video Lecturing System, but high quality in service for users. To solve these problems, the Multicast Transmission Technology as the dimension of Network as well as highly efficient, advanced Compression Technology should be applied to Video Conference System in company with the expansion of Network bandwidth. The system suggested in this thesis is to help to offer an application service as Distance Video Lecturing System that will make popular on the basis of the character that the next generation Internet will be high speed Network.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.27 no.7A
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• pp.629-634
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• 2002

The next generation of wireless communication system is expected to provide users with wireless multimedia services such as high speed internet access and wireless mobile computing. Depending on the Quality of Service(QoS) requirements and different applications per user, many wireless communication systems have been proposed. The simple decoding algorithm of space-time block coding is based on the assumption of flat fading channel, where no intersymbol interference exists. In this paper, we propose to combine space-time transmit diversity with adaptive equalizer. The proposed system effectively eliminates interference caused by multipath environment. Simulation results show that the proposed system provides improved bit error rate performance.

• Convergence Security Journal
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• v.13 no.6
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• pp.3-9
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• 2013

With the rapidly changing information communication environment and development of technologies, the informati on networks are evolved from traditional fixed form to an active variable network that flexible large variety of data can be transferred. To reflect the needs of users, the next generation using DWDM (Dense Wavelength Division M ultiplexing) transmission system and OXC (Optical Cross Connect) form a dynamic network. After that GMPLS (Ge neralized Multi-Protocol Label Switching) can be introduced to dynamically manage and control the Reconfigurable Optical Add-drop Multiplexer (ROADM)/Photonic Cross Connect (PXC) based network. This paper propose a softw are architecture of Path Computation Element (PCE) protocol that has proposed by Internet Engineering Task Force (IETF) to path computation. The functional blocks and Application Programming Interface (API) of the PCE protoco l implementation are also presented.

• Electronics and Telecommunications Trends
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• v.30 no.4
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• pp.129-139
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• 2015

현재의 인터넷은 40여 년 전에 신뢰할 수 있는 호스트 간의 통신을 기반으로 설계되어 식별성(Identity)과 기밀성(Privacy)등의 보안성에 대한 특별한 요구사항이 없었다. 추후 인터넷이 전 세계적으로 확장함에 따라 신뢰할 수 없는 호스트가 통신에 참여하게 되었고 이에 대한 보안 요구사항이 새롭게 등장하였다. 이러한 요구사항을 만족시키기 위한 인터넷의 보안 기술은 키(Key)에 매우 의존적으로 발전하여 현재 모든 인증 관련 기술과 보안 기술들은 공개키 기반 구조(Public Key Infrastructure: PKI)와 같이 키를 기반으로 하고 있다. 이러한 연구 동향은 미래인터넷의 보안 연구에서도 여전히 반영되어 미국에서 진행 중인 eXpressive Internet Architecture(XIA)나 다른 미래 인터넷 프로젝트에서도 키 기반의 보안기술 연구를 진행하고 있다. 하지만 모든 통신을 의심하고 이를 감시하기 위한 기존의 인터넷 보안 기술과 달리 미래인터넷 보안 연구는 상호 신뢰를 기반으로 네트워크에 대한 공격 자체를 원천적으로 차단할 수 있는 신뢰통신(Trustworthy communication)을 목적으로 하고 있으며 이에 대한 새로운 연구 결과가 등장하고 있다. 본고에서는 차세대 보안연구 분야인 신뢰통신의 연구동향과 성과를 소개하고 장단점을 분석한다. 특히 미래인터넷의 신뢰통신 연구 중 대중적으로 인정받고 있는 공개키를 이용한 자가인증(Self-certifying)과 이를 뒷받침하기 위한 공개키 검증 시스템 연구 및 신뢰경로 구축 연구를 중심으로 미래인터넷의 신뢰통신 연구가 진행된 과정을 중점적으로 소개한다.

• Spatial Information Research
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• v.14 no.3 s.38
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• pp.261-270
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• 2006

With the development and invention of computer and internet, GIS (Geographic Information System) has provided diverse services to users. Web 2.0, the next generation web, has been developed to create a new business by accumulating and structuring information from many users. The characteristics of Web 2.0 are blog, longtail distribution, SNS, DCC, collective intelligence, and so on. This study proposes a GIS 2.0 service model to maximize the introduction effect and use of GIS by the method that two-way communication and the participation of consumer, characteristics of Web 2.0, are used to build more practical GIS rather than providing spatial information in one-way and simple inquiry oriented way.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.43 no.12 s.354
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• pp.42-52
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• 2006

The interest for IPv6, Which is next generation IP, increases, while th difficulty for adopting it into IT indestries also increase too. We also expect that Internet technologies develop 0 basis of All-IP networks, which include various heterogeneous networks. Therefore, it is necessary for network to support mobility and multicast capavility to create application with wide-variety- In this paper, we propose a scheme that be able to provide mobility and multicast efficient in IPv6 networks. The proposed scheme has been implemented and experimented on NS-2 and validated with respect to multicast packet delay time and count of Joining and pruning)