• Electronics and Telecommunications Trends
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• v.14 no.5 s.59
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• pp.55-69
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• 1999

초고속통신망에서 서비스 사업자 시스템에 적용될 번호체계, 상호접속 기준에 대한 기본적 요건과 기술적 표준 규정 등에 관한 연구가 미비한 실정이다. 초고속 서비스 사업자 망과 초고속 통신망에 접속 및 운용되는 시스템에서 초고속망의 번호계획을 위하여 연동을 고려할 대상 망은 기존의 전화망, 데이터망, ATM 망 및 ISDN 등이 있다. 본 고에서는 인터넷망과 ATM 망과의 연동시 발생할 번호체계의 상호접속 및 연동방안에 대하여 논한다. 현재 제정된 ITU-T 표준 규격을 중심으로 현존하는 망과 초고속 번호체계간의 상호 연동방안을 기술하였다. 또한 ATM 포럼 등의 사설기관에서 사용하고 있는 번호체계도 추가적으로 검토하였다.

• Journal of the Korean Institute of Telematics and Electronics S
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• v.35S no.5
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• pp.17-26
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• 1998

B-ISDN has many advantages to provide multimedia, image transfer, etc. Recently, ABR service has been proposed in order to satisfy user's various requirements in it. In this paper, we propose a new ABR flow control algorithm called CAPRO. This algorithm uses the buffer proportional to propagation delay and controls the traffic on a link-by-link basis in order to minimize the effect of propagation delay. In order to use buffer more efficienctly, we define the request cell and the control cell. Then, we analyze our algorithm using mathematical model, simulate it using SLAM system, and compare to the existing EPRCA. As a result, our algorithm has the benifit of the throughput, cell loss probability, and fairness.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.25 no.9A
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• pp.1377-1386
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• 2000

As all delays resulting from the signaling network directly affect the response time of network management activity, all control informations have to be transported most efficiently. It is very important to know the performance of the signaling system not only because of smooth network operation but also because of efficient engineering of signaling networks. In this paper, we analyzed mean queueing delay of signaling link for ISUP signaling messages in common channel signaling system by using M[X]/G/1 and M[X]/D/1 batch arrival queueing system. This is because we modeled arrival process of the signaling messages as batch arrival process considering that many kinds of signaling messages are generated at short intervals when a call requests a connection. Analysis was carried out considering different call processing scenario based on ITU-T specification. We also described the numerical results from the different types of queueing models.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.22 no.8
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• pp.1643-1651
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• 1997

Next generation mobile networks will be demanded to support high speed data and multimedia services in addition to extisting serviced including voice communications. In this paper, we discuss the requirements of the wireless service with broad range of appkications, and present several types of architecture for future bobile network. After a brief comparative analysis, we propose a most practical and feasible one. And also, we discuss possible interworking scenarios between radio access system and intelligent network. In consideration of the selected infrastructure and scenario, we present protocol architectures and basic functions of radio access system. Based on the architecture, we believe that the itegrated system can be realized with such advantages of easy interworking, high feasibility on common services, easy introduction to new services, and unified operation.

• Proceedings of the KIEE Conference
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• 1999.07g
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• pp.3196-3198
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• 1999

In this paper, we are proposed ATM AAL 1 source clock recovery methods for CBR service. The proposed method compute the difference between network clock level and the reference level by inspecting the variation of a buffer. Also it is the service clock recovery method that control local clock using the look-up table defined clock dividing rate of the difference in advance. It can be applicable to both SDH network and PDH network which has no common reference clock between its ends, it has an important mean in view of the internetworking between existing networks for the integrated service chased by B_ISDN.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 1998.05a
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• pp.109-114
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• 1998

초고속 정보통신의 경제적인 구축을 위해서는 기존 통신망의 적절한 활용이 요구된다. 현재 국내에서는 PSTN, N-ISDN, 기업망 등 많은 독자적인 망들이 운용되고 있는데 비하여 이들 망의 점진적인 발전 및 초고속 통신망으로의 효율적인 통합운용이 절실히 요구되는 시점이다. 이러한 상황을 개선하기 위해, 초고속 통신망의 하부망으로서 경제적인 대안으로 관심을 끌고 있는 기존망의 하나가 CAIV 전송망의 일종인 HFC(Hybrid Fiber Coax)망 이다. 지금까지 HFC망은 주로 일반 통신 사업자 입장에서 보다는 CATV사업자들이 기 보유한 망을 통해서 통신과 방송의 통합 서비스를 경제적으로 제공하고자 하는 방안으로서 많은 관심을 끌고 있다. 본 논문에서는 HFC 구조에서 상향으로의 데이터 충돌이 발생했을 시 이 문제를 해결하기 위해 IEEE802.14에서 제안하는 MAC Protocol과 HFC망의 MAC프로토콜 구성요소 중 제안된 경합중재 알고리즘의 형태를 알아보고 이중 Tree algorithm을 분기율에 따라 성능을 평가하고자 한다.

• Journal of the Korean Institute of Navigation
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• v.20 no.4
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• pp.111-128
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• 1996

This paper is focused on the desirable improvement schemes of the local network of information and telecommunication network. In this study, we examined whether polices of information and telecommunication of government have been carried out a desirable programme to meet the public interest, found out several problems in the these policies. Such problems as follows : (1) a system of local information & telecommunication is developing by a Model of Top-Down. In the present management system, an interest of the public of local society about the local telecommunication network is a much lower level, (2) there is no general controlling roll of the local information & telecommunication, (3) there is no service controlling system of local telecommuni-cation, and (4) there is no organic coordinating system of inter-departments in the central government level. In order to resolve these problems, this study suggests a few desirable sxhemes for the local telecommunication : (1) an establishment of middle-long range planning for the integrated future network of info-telecommunication, (2) an organizing of telecommunication network being suitable for the local characteristics toward B-ISDN.

• Korea Multimedia Society
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• v.1 no.1
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• pp.19-32
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• 1997

There are many kinds of predominant modes to transfer Multimedia information on internet in the world. Various methods are applied to get real time multimedia data as possible as we need. At the moment it is very difficult to use acceptable technologies for performe those methods effectively on the Networks. This paper gives the alternative directions and trends for research and development of multimedia transmission on the internet. ATM is one of the best mode to transfer mass-multimedia data at the high speed on the Broad-Band ISDN until now. And xDSL (xDigital Subscriber Line) is an excellent typical method on the PSTN (Public Switched Telephone Network) using old type telephone line. But they are not yet applied into the phase of practical use together this time. So this paper analyzes what we need and how to develop the multimedia transmission modes which we can send on the internet without a problem or any difficulty for our various multimedia information all the time under low cost and high speed.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.18 no.33
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• pp.123-134
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• 1995

After the introduction of ATM as a proper technology for B-ISDN, there have been many research efforts to realize ATM networks. But a computationally tractable modelling technique which reflects diverse characteristics of the ATM traffic accurately is not available yet. In this study, we try to establish an accurate but still convenient ATM traffic model. We first introduce the modelling technique for the voice traffic based on the fluid flow approximation. Then we present a traffic model for the mixed traffic from multiple video sources and voice sources. The video source model is based on the 3 state continuous time Markov chain. The accuracy of the model is demonstrated by some comparison results with respect to simulation.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.8 no.1
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• pp.11-22
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• 1998

ISDM에서는 모든 정보가 디지털 형태로 전송되고 통신망 접속이 개방성을 갖기 때문에 중요 정보자원에 대한 정보보호 문제점이 날로 증가하게 되었다. 따라서 이러한 불법적인 침입자에 의하여 우연 또는 의도적인 침입 위협에 대한 정보보호의 필요성이 절실히 요구되는 실정이다. 그러므로 본 논문에서는 ISDN패킷교환방식의 가상회선 서비스에서, 비밀키 암호화 시스템과, 비밀키와 공개키 암호화 시스템을 결합한 하이브리드 암호화 시스템을 이용하여 사용자 상호간의 안전한 인증 절차를 제안하였다. 또한 네트워크 내부에 인증센터를 설치하지 않고 네트워크 외부에 인증센터를 설치하여 호설정 과정 중에 사용자 상호 인증이 이루어짐으로, 보다 신속하고 안전하게 사용자의 중요 정보를 전달할 수 있는 키 분배 프로토콜과 호 제어 방식을 제어하였다.