• Journal of KIISE
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• v.42 no.2
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• pp.213-219
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• 2015

Simulation is used these days to verify the hypothesis or the new technology. In particular, National Defense Modeling & Simulation (M&S) is used to predict wartime situation and conduct the military training. National Defense M&S can be divided into three parts, live simulation, virtual simulation, and constructive simulation. Live simulation is based on the real environment, which allows more realistic sumulation; however, it has decreased budget efficiency, but reduced depictions of reality. In contrast, virtual and constructive simulations which are based on the virtual environment, have increased budget efficiency, but reduced depictions of reality. Thus, if the three parts of the M&S are combined to make the L-V-C combined environment, the disadvantages of each simulation can be complemented to increases the quality of the simulation. In this paper, a method of interworking heterogeneous simulation middeware for L-V-C combined environment is proposed, and the test results of interworking between Data Distribution Service (DDS) and High Level Architecture (HLA) are shown.

• Proceedings of the IEEK Conference
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• 2000.11a
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• pp.259-262
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• 2000

MSF(MultiService Switching Forum) 개념이 도입된 개방형 시스템 구조를 적용한 고성능 스위칭 시스템 개발이 필요하며, Media Gateway System은 ATM망에서 중저속의 Non-ATM 인터페이스를 수용하는 ATM access multiplexer/concentrator로서 ATM 물리계층 기능, ATM 계층 기능, 회선대행 기능, AAL2 trunking 기능, N-ISDN 연동 기능 및 FR/ATM 연동기능을 제공한다. 본 논문에서는 Media Gateway System에 FR/ATM 연동 기능을 구현하기 위하여 적용할 연동 규격을 살펴보고 FR/ATM 연동시스템 구조를 제안하였다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 1998.11a
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• pp.483-487
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• 1998

실시간 주문형 비디오 서비스를 수용하는 멀티미디어 셋탑 박스와 서비스 서버간의 서비스 연결의 연속성을 제공하면서 사용자 단말의 추가적인 부담을 줄이기 위해 ATM 액세스 노드 내에 연결성 연동 에이젼트 기능을 구현하였다. 이를 통하여 망 내의 SVC와의 연결성을 사용자 단말에게 제공하는 방안을 제시하고 이를 MPEG-1 VOD 서비스의 연결 설정 및 해제에 적용한다.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 1991.10a
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• pp.199-202
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• 1991

Recent telecommunication technology trends have made possible the concept of Intelligent Network, which is expected to lead to additional revenues for both telecommunication administers as well as business service customers. In this paper international Korea Telecommunication Network configuration with special services are described and introducing the Intelligent Network Services into the international Korea Telecommunication Network in a phased manner is studied considering of interworking between international and domestic Intelligent Network services.

• Journal of Industrial Technology
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• v.11
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• pp.99-106
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• 1991

In this paper the functional requirements of a B-ISDN access network based on MAN are investigated. Firstly, criteria of designing access network for the B-ISDN is studied. Secondly, the types of subscribers and their service requirements are defined. Thirdly, various architectures of CPNs(Customer Premises Networks) are considered and their characteristics are studied, Finally, the interworking functions of a DQDB MAN as an access network are investigated.

• The KIPS Transactions:PartC
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• v.11C no.6 s.95
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• pp.799-806
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• 2004

A growing diversity of pervasive devices is gaming access to the Internet and other information. However, much of the rich multimedia contents cannot be easily handled by the client devices because of the limited communication, processing, storage and display capabilities. The in-tegration of voice, data and video service modified the target of networking technologies. Networks must have some the capabilities for in-tegration of various services and also for QoS support as required by each of those service. Because of these reasons, we developed EAGIS(Efficient ATM Gateway for real time Internet Service) to provide seamless multimedia service between the ATM network and the Internet. EAGIS consists of the interworking unit, content server, transcoding server, and the serveice broker to provide seamless multimedia service be-tween the ATM network and the Internet. In this paper, we design the architecture and transcoding service scenario of the EAGIS. When the RTP is used for the bi-directional communication, transcoding time is configured by the time-stamp of RTCP. When HTTP is used for unidirec-tional communication, self-timer is used. By using these reference time, standard transcoding method is applicable according to the frame trans-mission rate and network traffic load. And we can also assure the QoS of the multiple users` effective bandwidth by our algorithm.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.21 no.1
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• pp.103-118
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• 1996

With the advent of B-ISDN based on ATM technonlogy, ther are increasing needs for the interconnection of existing LAN/MAN's through ATM networks. ATM networks, therefore, must provide connectionless service. In this paper, the traffic distributio scheme using multi-path is proposed to support efficient connectionless service in ATM networks. Because the proposed scheme distributed the bursty traffic arrived in the interworking unit (IWU) and the connectionless server (CLS) from LAN-terminals, it alleviates the packet loss ratio caused by buffer overflow at IWU/CLS and is able to use nettowrk resources efficiently according to the network conditions and the amount of the traffic arrived at IWU/CLS. This paper presents the distribution algorithm and the IWU/CLS, CLS-CLS closed-loop rate control scheme.

• The Journal of the Korea institute of electronic communication sciences
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• v.18 no.2
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• pp.259-268
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• 2023

In this paper, it is said that the quality of wireless service has been improved by providing wireless service that can eventually overcome wired wires by using 2.4GHz band wireless access technology that supports 2.4/5GHz dual band. Increasing the maintenance cost incurred when building wireless CCTV, makes it possible to connect with existing CCTV, and study about expanding the service area of A/V surveillance system using CCTV.

• Journal of information and communication convergence engineering
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• v.12 no.4
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• pp.228-236
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• 2014

One of major purposes of these standard technologies is to ensure interoperability between entities from different vendors and enable interworking between various technologies. As interoperability and interworking are essential for machine-to-machine communications (M2M) and Internet of Things (IoT) for them to achieve their ultimate goal, i.e., things to be connected each other, multiple standards organizations are now working on development M2M/IoT related specifications. This paper reviews the current activities of some of the most relevant standardization bodies in the area of M2M and IoT: third-generation partnership project (3GPP) core and radio network aspects, broadband forum, and oneM2M. The major features and issues being focused upon in these standards bodies are summarized. Finally, some key common trends among the different bodies are identified: a common service layer platform, new technologies mitigating an explosive growth of network traffic, and considerations and efforts related to the development of device management technologies.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.18 no.5
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• pp.675-684
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• 1993

In this paper, we analyze a traffic control schemes at the interworking unit(IWU) of the IEEE 802.6 DQDB MAN and the B-ISDN, and estimate its performance via computer simulation. We also study traffic management, relaying sublayers for the cases of four service classes defined in the B-ISDN. As for performance criteria, we consider slot waiting time, slot loss rate, and the fairness between DQDB nodes in access networks. We propose a simple control algorithm that decreases the waitint delay at the OWU. With the buffer size of 40 [slots] at the IWU, we have found that the slot loss rate was nearly zero at traffic load below 0.9, and the slot waiting time became less than 15 slot times.