• Proceedings of the Korea Multimedia Society Conference
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• 2002.05c
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• pp.443-448
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• 2002

인터넷의 서비스 품질(QoS : Quality of Service)에 대한 요구가 점차 커지고 있다. 본 논문에서는 QoS 보장 방법중의 하나인 RSVP(Resource Reservation Protocol)에 대하여 기술하고 RSVP 사용에 알맞은 edge망에서 네트워크 대역을 예약하는 과정에서 생기는 문제점를 지적하고, 이에 대한 해결방안으로서 다중경로 예약방식을 제안하였으며, 그 성능을 시뮬레이션을 통하여 분석하였다.

• Proceedings of the Korea Technology Innovation Society Conference
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• 2001.11a
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• pp.141-168
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• 2001

본 연구는 초고속인터넷 접속서비스에서 $\ulcorner$서비스 품질$\longrightarrow$고객만족$\longrightarrow$재구매의도(고객충성도)$\lrcorner$의 일반적인 인과관계가 적용되는지를 규명하고, 고객만족, 재구매의도와 고객충성도에 영향을 미치는 서비스 품질속성을 살펴보면서, 궁극적으로 품질속성 중 고객유지와 충성도를 향상시키는 핵심 품질요소를 도출하기 위한 모형을 이론적으로 제시하고, 그 모형의 유효성을 설문조사와 이에 대한 실증분석을 통해 평가하는데 목적이 있다. 모형을 검증하기 위하여 세 단계의 분석과정을 수행하였다. 첫째, 전반적 서비스 품질과 고객만족, 재구매의도(또는 고객충성도), 그러고 고객만족과 재구매의도 및 고객충성도의 상호관계를 검증하였다. 둘째, 고객만족, 재구매의도 및 고객충성도에 영향을 미치는 선행변수인 품질속성(서비스 성능, 서비스 지원, 부가서비스, 이용요금, 과금, 절차 편리성)들의 영향력을 검증하였다. 마지막으로 공통적 개념으로 분류된 품질속성이 개별적인 품질요소의 미세한 차이를 제대로 반영하지 못하는 단점을 극복하고, 고객유지와 충성도 향상을 위한 핵심 품질요소를 도출하기 위하여 품질속성을 대표하는 품질요소들과 재구매의도와 고객충성도의 상관관계를 살펴보았다. 초고속인터넷 접속서비스 이용자를 대상으로 웹설문조사를 실시하여 총 551 개의 표본을 분석에 사용하였으며, 분석결과는 다음과 같다. 첫째, 서비스 품질은 재구매의도와 고객충성도에 비해 고객만족에 높은 설명력을 갖고 있으며, 재구매의도에 대한 서비스 품질과 고객만족의 설명력은 미미한 것으로 나타나, 고객만족이 더 높은 설명력을 갖는다는 기존의 연구와 차이를 보여 향후 추가적인 연구의 필요성이 제기되었다. 둘째, 여섯 가지의 품질속성들 중 서비스 이용과정에서 1, 2 회의 적은 경험을 하게 되는 서비스 이용절차의 편리성을 제외하곤 나머지 속성 모두 고객만족, 재구매의도 및 고객충성도의 선행변수로써 영향을 미치고 있는 것으로 나타났다. 그러나 절차 편리성은 고객충성도에 유의한 영향을 미치는 것으로 나타나, 충성도는 고객이 서비스를 총체적인 관점에서 평가하고 나타나는 행동이라는 시사점을 얻었다. 셋째, 재구매의도와 고객충성도를 결정하는 품질요소로서는 서비스 안정성, 불만사항 처리결과, 회사의 이미지, 다양한 부가서비스가 도출되었다. 본 연구의 결과는 초고속인터넷 접속서비스의 품질 및 결과변수들에 대한 인과관계를 분석하였다. 그리고 경쟁이 치열해지는 시장 환경에서 미래의 재무적 성과와 수익성을 보장하는 충성스런 고객을 확보하기 위하여 필수적으로 관리되어야 할 핵심 품질요소의 제시와 이에 따른 제언을 하였기 때문에 사업자들이 품질 및 마케팅 전략을 수립함에 있어서 이론적, 실무적 근거를 제공하여 준다.

• The KIPS Transactions:PartC
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• v.10C no.2
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• pp.155-162
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• 2003

Fast restoration time and service guarantee are the important goals to achieve the network reliability. In the protection switching scheme, one way to guarantee service fro an application session if a network happens to fail is to establish the restoration path that amounts to the same bandwidth of the working path of the session at the same time. When we setup the restoration path, we can reduce the bandwidth consumption by the restoration path if the path can share the bandwidth required by the other paths. This paper explains the methods how to determine the shared bandwidth of the restoration path in the protection switching scheme, given the maximum bandwidth assigned to a link along the working path. We point out that such sharing algorithm can not reduce the bandwidth consumption by the restoration paths in some cases, which contradict the general conception. We explain why this can happen, and show the simulation results in real network topologies to prove our arguments. We explain the reason of the failure of the sharing effect by the simple sharing algorithm. Finally we propose the way of how we can overcome the failure of the sharing effect, using the complete sharing algorithm based on the link database and showing the results.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.30 no.5A
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• pp.370-375
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• 2005

While the international standards bodies recommend the dual leaky buckets for the traffic specification for VBR service, video traffic shows burstiness in multiple time-scales. In order to fill this gap between the current standards and real traffic characteristics, we present a standard-compatible traffic parameter selection method based on the notion of a critical time scale (CTS). Since the defined algorithm minimizes the required link capacity under a maximum delay constraint, it could be used as a benchmark even when it can not be implemented easily. Simulation results with compressed video traces demonstrate the efficiency of the defined traffic parameter selection algorithm in resource allocation.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.13 no.9
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• pp.1760-1766
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• 2009

Digital broadcasting and digital CATV and IPTV will continue in the competition, regardless of how the content of the program was broadcast over the Internet distribution and the damage of piracy is also growing. Excellent quality of the content of the digital CATV sales of DVD and high-density storage media because there is no difference in content and quality is the problem of illegal distribution. However, users can record and reuse program in the position of the guaranteed rights, and the purpose of training in fair and illegal recording and distribution needs to be separate from it. In this paper using a digital certificate recorded by the user and the process to ensure the purpose of illegal distribution of pharmaceutical distribution system design and implementation of the program was broadcast.

• The KIPS Transactions:PartC
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• v.8C no.1
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• pp.41-50
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• 2001

With growth of Internet, real time multimedia application services require guarantee of QoS (Quality of Service). However, the existing Internet based on best-effort service is not enough to support those services, so MARS model to support IP multicast over ATM networks and RSVP to provide heterogeneous QoS by resource reservation scheme are proposed. As a simulation result, it is proved that processing delay of MARS is increased and success of resource reservation is decreased as a number of QoS change request of a receiver is increased. Therefore, it is important to provide heterogeneous QoS that distribute a load of MARS caused by convergence of messages and efficiently manage the resource of network as to find out scale of receivers and frequency of QoS change request.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.11 no.2
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• pp.584-589
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• 2010

In this paper we suggest multimedia synchronization model that is based on the Petri-net and services desirable quality of service requirement. Proposed model applies variable buffer which can be allowed, and then it presents high quality of service and real time characteristics. In this paper we expend Petri-net and propose new multimedia synchronization specification model in PBMSM and apply two analysis method of Petri-net to prove our model suggested. We compared with other models and showed high QoS.

• Journal of Korea Multimedia Society
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• v.11 no.11
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• pp.1536-1546
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• 2008

RSVP-capable router supporting guaranteed services on the internet generally uses a packet scheduler based on the Weighted Fair Queuing (WFQ) algorithm to secure required qualities of traffic flows. A RSVP-capable router based on the LOFQ (Latency optimized fair queuing) algorithm had been proposed to improve the performance of the WFQ-based RSVP-router, but it required not only the RESV message to be expanded but also its performance could be evaluated only through simulation. This paper proposed a LOFQ based RSVP-capable router using the conventional RESV message and developed an algorithm to analyze the performance of the LOFQ based RSVP-capable routers. The performance evaluation using the developed algorithm showed that in terms of performance improvement the proposed router is inferior to the one using the expanded RESV message under a small packet size, but on the range of a large packet size both routers provide the same improvement.

• Journal of Korea Multimedia Society
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• v.6 no.5
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• pp.842-848
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• 2003

The Guaranteed Frame Rate(GFR) service has been designed to accomodate non-real-time applications, such as TCP/IP based traffic in ATM networks. One of the important factors is buffer management for guaranteeing QoS in GFR service. In this paper, we propose a buffer management scheme which can improve the fairness and the throughput through the traffic control in GFR service. For the evaluation of the proposed scheme, we compare proposed scheme with the existing scheme in the fairness and the throughput. Simulation results show that proposed scheme can improve the fairness and throughput than the existing scheme.

• 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.