• The Journal of Korean Institute of Communications and Information Sciences
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• v.36 no.1A
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• pp.1-7
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• 2011

Cell Capacity and cell layout are strongly dependent on the up-link interference caused by out-of-cell mobiles. Accurate prediction of the propagation path loss from out-of-cell mobiles is essential to achieve system designs that minimize the infrastructure required for a given quality of service (QOS). Less accurate predictions can be expected to yield designs requiring the use of a greater number of base stations. In order to quantify the dependence of infrastructure on prediction accuracy, this paper considers the cellular systems, LOS (line of sight) cells along a road or highway.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.29 no.4B
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• pp.435-443
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• 2004

Although RSVP is a strong signaling protocol in providing QoS support, it is not scalable. Thus, the IETF introduced the concept of aggregation into RSVP However, the specification for the aggregation of RSVP does not specify how to compute the size of aggregate reservation for a path, but only describes how the resources are reserved and released with a given size. This paper proposes the method of properly determining the size of aggregate reservation on the path condition, when aggregate reservation is performed through RSVP for guaranteeing QoS of multimedia traffic. Simulation results show that the proposed method improves efficiency of the aggregation of RSVP.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• v.9 no.1
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• pp.1094-1097
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• 2005

It is issued that protecting and managing a copyright are very important to a digitization of multimedia contents. We analyze the trend of a multimedia service, IPMP(Intellectual Property Management and Protection), DMP(Digital Media Project), ENTHRONE(End-to-end Qos through Integrated Management of Content, Networks and Terminals), and DRM(Digital Rights Management). All of these techniques are for developing solution about protection and management of the copyright and media service. These have been at the head of the growth of the whole media service, but cause problems such as a illegal copy and distribution. To solve these problems, researchers are performing many projects.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.10 no.7
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• pp.1614-1620
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• 2009

The overlay multicast that has been recently presented as an alternative for the IP multicast has been getting much persuasion by the system resource and the network bandwidth and the advancement of the network cost. we propose a overlay multi_casting network policy for efficient multimedia services with P2P join scheduling. In order to evaluate the performance of proposed scheme, We test the performance of multi_casting nodes with average join count, the maximum guaranteed waiting time and buffer starvation ratio with similar techniques. The result of simulation shows improved about 15${\sim}$20% of performance.

• Proceedings of the IEEK Conference
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• 2000.11a
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• pp.287-290
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• 2000

This paper analyze link-sharing mechanisms in packet networks based on the hierarchical class based queueing. The CBQ outlines a set of flexible, efficiently implemented gateway mechanisms that can meet a range of service and link-sharing requirements. We have analyzed the Class level(B, C, D) using the EWMA (Exponential Weighted Moving Average) weight value and EWMA average limit value.

• Proceedings of the IEEK Conference
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• 1998.10a
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• pp.75-78
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• 1998

In this paper, we propose a new cell discarding and scheduling scheme which reduce cell loss rate by measuring, in real time, the number of discarded cells in the queuing system with a different loss priority for each class of service such that each class of service meets its cell loss rate requirements and reduce average delay rate for the traffic that is sensitive in cell delay in output buffer of the ATM switch. Throughout the computer simulation, the existing scheduling scheme and proposed scheme are compared with respect to cell loss rate and average delay time.

• Proceedings of the IEEK Conference
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• 1998.10a
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• pp.3-6
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• 1998

This paper considers the analysis of QoS(Quality of Service) routing mechanisms to support the NGIs(Next Generation Internets). NGIs are constructing high-speed IP layer networks to support all data services. To support real time multimedia services on NGIs, it is important to satisfy the required QoS parameters on networks. To support QoS requirements for NGI networks, new QoS routing methods are essential. In this paper, serveral new QoS routing algorithms are explained. Some problems for the high speed QoS routing will be explained and possible solutions are suggested.

• Review of KIISC
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• v.8 no.2
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• pp.19-36
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• 1998

IPv6(일명 IPng (Internet Protocol next Generation)은 현재의 인터넷 프로토콜인 IPv4를 개량한 다음 세대의 인터넷 프로토콜이다. 새롭게 개량된 주요내용은 주소공간의 확장, 이동사용자를 위한 IP(Mobile IP)추가, VOD(Video on demand)와 같은 고속통신 QOS(Quality of service) 추가, 그리고 네트워크 계층에서 보안메커니즘 제공 등을 들 수 있다. [1][2][3]. 본논문에서는 이들 중에서 네트워크 계층의 보안 메카니즘을 기존의 전송계층의 SSL(Secure Socket Layer)보안 메카니즘과 비교 분석 하였다.

• The Transactions of the Korea Information Processing Society
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• v.5 no.6
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• pp.1457-1467
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• 1998

본 논문에서는 ATM-LAN상 Navigation서버를 이용한 브라우징 메카니즘, 서버와 클라이언트, 응용, AAL과 Qos간 협상 및 예약 절차의 세션 설정 기술, 프레임의 분열 및 재결합에 관한 알고리즘을 제안하고 구현한 후, 실험 평가한다. 그리고 사용자에게 효율적인 서비스를 제공하기 위한 서비스 관리 모델로서 서비스 메니저를 모델링한다.

• Proceedings of the IEEK Conference
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• 1998.06a
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• pp.713-716
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• 1998

We propose the dejittering method against the jitter originated from the cell losses in ATM network when CBR traffic is transfereed on AAL5. Cell numbering algong with maintaining a timer at receier side introduces 0.669 times peak-to-peak PDV of the AAL5 PDU to that in ITU-T AAL5 standard, and the AAL5 user-HDTV decoder-receives the same or more error-free transport packets in the proposed algorithm than those in the ITU-T AAL5 standard for the same network simulation environment.