• The KIPS Transactions:PartA
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• v.15A no.2
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• pp.101-110
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• 2008

Ubiquitous computing has extended the computer system into the whole physical space and has ushered the emergence of more dynamic distributed systems. This environment require unique QoS parameters for various devices, resources and user requirements. In this paper, we propose a new hybrid QoS management model which defines a static-dynamic QoS parameter that is more appropriate to the ubiquitous computing environment. This model consists of the QoS Control Management Module(QoS CMM) in the client side and the Resource QoS Management Module (RQoS MM) in the server side. The RQoS MM deals with the static QoS parameters and the whole QoS control of the distributed control(QoS CMM) in order to minimize server load in cases of multiple communication. Finally, we present the experimental result of our location based application using a graphical user interface that shows the multimedia service execution of selected client device types such as desktop PC, notebook and PDA.

• Journal of Korea Multimedia Society
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• v.10 no.2
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• pp.278-287
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• 2007

Even though a variety of types of multimedia data are being used on the basis of user characteristics and demands, all devices do not always support playing all multimedia data. Accordingly, a multimedia transcoder is used to create media suitable for each environments. This is due to the dissimilarity between the source QoS and the target QoS. Therefore, we need to consider adapting the two dissimilar QoS. Therefore in this paper, we create a suitable application-specific transcoding path with unit transcoders before performing the media transcoding in consideration of source QoS and target QoS. and the created transcoding path performs the transcoding. Here, creating a UTR(Unit Transcoder) conversion path that considers the transcoding possibility and the minimum of the UTR will allow the playback of various multimedia data with convenience. and The consideration of QoS allows users to use the multimedia easily.

• The KIPS Transactions:PartC
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• v.12C no.6 s.102
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• pp.781-792
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• 2005

This study proposes an Architecture for user level End-to-end Quality of Service(QoS) using overlay In Next Generation Network(NGN). Inexisting NGNs, the IMS of a control plane provides user QoS through direct traffic control and resource-reservation over the IP packet transport network of a user plane. Further, a set of torrent studies are ongoing not only to maximize the QoS for users, but also to minimize the quality deterioration for supporting the user End-to-end QoS. Along with that, an extended QoS in user level must be considered, for Instance, differentiating service quality to support users' expectation, providing optimized contents by users' equipments, and so forth. Accordingly, the Overlay Service Network Architecture proposed by this study provides protocol adaptation for maximum throughput on transport layer by using the most efficient transport layer protocol to various network circumstances. Also, the Overlay Service Network Architecture on application layer distributes processing delay from the data transformation process of the user equipment to the network, and it is capable of intermediate processing depending on user service level. application service feature, and equipment circumstance as well. Thus, this study mainly proposes the Overlay Service Network Architecture for user level end-to-end QoS in NGN with the quality control features both on the transport layer and the application layer, an internal component feature, and a service scenario providing the QoS linking with 3GPP.

• Journal of Advanced Navigation Technology
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• v.14 no.6
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• pp.865-873
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• 2010

In this paper, a novel schedulability criteria is developed to provide handover calls with Quality of Service (QoS) guarantees in terms of both minimum available bandwidth, maximum tolerated packet delay, and other additive QoS constraints as required by the real-time mobile traffic. This requires prediction of the handover time using mobility trends on the mobile station, which is used as input to this work. After the handover time and the QoS are negotiated, the destination base station makes attempts to give priority to handover calls over new calls, and pre-reserves resources that will have more chance of being available during the actual handover.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2022.05a
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• pp.524-526
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• 2022

Considering QoS only considering real-time multimedia service, it is possible to adjust the number of terminals and ensure them appropriately, but this study considers complex services considering real-time multimedia service and general data service. Since the amount of physical network resources is limited, the guarantee of the desired QoS can not be achieved unless the appropriate CAC is done. However, given the traffic profile and QoS spec of the entire network resource and the current service being provided, and the traffic profile and QoS spec of the newly requested service, it is quite difficult to determine exactly whether the new service request is acceptable from this. To do this, it is necessary to study in various directions from mathematical analysis to various simulations and statistical research based on data obtained from actual network operation.

• Electronics and Telecommunications Trends
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• v.19 no.1 s.85
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• pp.9-21
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• 2004

차세대 통신 시스템은 다양한 IP 멀티미디어 응용을 지원하고, 유비쿼터스 서비스를 제공할 수 있도록 다양한 유무선 통신 시스템들이 IP 기반의 멀티네트워크로 통합될 것이다. 이러한 차세대 통신 시스템에서 IP 기반 멀티미디어 응용을 효율적으로 지원하기 위하여 종단간 QoS 제공이 중요한 문제가 된다. 본 고에서는 3세대 이동통신과 차세대 백본 네트워크(NGN)에서 연구되고 있는 QoS 제공 방안을 살펴본다. 그리고, 3세대 이후의 통신 시스템을 위하여 IP 네트워크에 기반을 두고 이질적인 무선 시스템들의 통합에 대해 연구하고 있는 프로젝트에서 All-IP화에 따른 종단간 QoS 제공 방안을 살펴본다. 그리고, 다양한 통신 시스템들이 IP 기반의 백본 네트워크로 통합되어 All-IP화된 차세대 통신 시스템의 개략적 구조를 제시하고, 이를 기반으로 종단간 QoS 제공을 위하여 연구되어야 할 주요 사항들을 살펴본다.

• Journal of KIISE:Computer Systems and Theory
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• v.26 no.1
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• pp.98-106
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• 1999

본 논문에서는 대용량 입출력을 수행하는 태스크의 QoS를 제어하기 위한 방법으로사용자가 시스템에 입출력 요구시 요구 대역폭을 제시하고, 파일시스템에서 디스크개소와 입출력 이벤트를 고려하여 입출력의 병렬성을 제어함으로써 QoS를 제어하는 방법을 제안하였다. 그리고, 시스템에서 각 태스크가 주어진 병렬성을 가지고 입출력을 진행하고 있을 때, 요구 대역폭을 가지고 입출력을 요구하는 태스크의 대역폭을 만족시키기 위한 병렬성을 계산하는 분석 모델을 유도하였다. 그리고, 디스크 입출력의 병렬성을 이용하여 대용량 입출력의 QoS를 효율적으로 제어할 수 있음을 분석 모델의 결과를 통해 검증하였다.

• Journal of KIISE:Information Networking
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• v.34 no.1
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• pp.73-80
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• 2007

This paper presents an approach to support dynamic QoS(Quality of Service) requirements of largely emerging SIP(Session Initiation Protocol) multimedia applications in broadband access networks. The topology of QoS-enabled broadband access networks and its operational model to support SIP QoS are firstly suggested. And then the procedures to bind QoS-enabled SIP signaling into an IP QoS mechanism are presented. In this paper, DiffServ-based IP QoS architecture is deployed due to the complexity problem of the other IntServ architecture, and COPS(Common Open Policy Service) and COPS-PR protocol based signaling mechanisms are used to support dynamic DiffServ QoS, correspondent with dynamic SIP QoS. The broadband access network is assumed to support rapidly expanding Metro Ethernet 802.1 D/Q QoS, and how to translate SIP QoS parameters into IP DiffServ classes and DiffServ classes into 802.1 D/Q QoS parameters is also presented in this paper.

• Journal of the Korea Society of Computer and Information
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• v.16 no.2
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• pp.243-248
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• 2011

According to increasing of accessing multimedia stream contents, Web services have become popular. However, these Web services are not supported with the same quality to Web clients who frequently access multimedia services. This paper proposes ontological technique to apply client level Quality of Service(QoS) that provides two different levels to serve Web service with proper quality by contribution value. And, it describes with UML(Unified Modeling Language) how to relate QoS and SLA(Service Level Agreement). Main contribution of this paper is to support client level QoS and SLA and to use Ontology for it. Therefore, this work uses an ontology-based approach to organize QoS and SLA, enabling semantic classification of all Web services based on domains and QoS and SLA attributes.

• Proceedings of the Korean Information Science Society Conference
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• 2004.10b
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• pp.43-45
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• 2004

웹 서비스의 등록, 검색, 조합, 실행을 자동적으로 수행할 수 있도록 웹 서비스에 시맨틱 웹 기술을 적용시킨 것이 시맨틱 웹 서비스(Semantic Web Services)이다. 시맨틱 웹 서비스는 원하는 서비스를 찾으려는 사용자의 노력을 줄이기 위해 기계가 이해할 수 있는 정보를 서비스에 추가시킴으로써 정확하게 원하는 서비스를 찾을 수 있게 해준다. 수많은 서비스들 중 같은 역할을 하는 서비스들이 있을 수가 있다. 그 중 하나의 서비스만을 선택해야 할 때 서비스의 기능이 아닌 질적인 측면에서 QoS(Quality of Service)를 고려하면 최선의 서비스를 선택을 하는데 도움을 줄 수 있다. 따라서 시맨틱 웹 서비스의 검색과 조합의 측면에서 매치메이킹(matchmaking)에 대한 연구의 하나로써 QoS의 매칭에 대한 연구를 수행하게 되었다. 기존의 QoS 매칭과 관련된 연구에서 QoS의 유사도를 계산하는 방법은 QoS 요소의 값의 특성을 반영하지 않는다는 것과 QoS 유사도의 순위가 놓더라도 좋은 서비스라는 것을 의미하지 않는다는 두 가지 문제점을 발견하였다. 따라서 본 논문에서는 기존 연구의 문제점을 해결할 수 있는 방법을 제시하고자 한다. 먼저 기존의 웹 서비스 관련 연구에서 논의된 여러 QoS 모델을 수렴하여 QoS 모델의 요소들을 결정하였다. 그리고 기존 연구의 두 가지 문제점을 해결하기 위해 각 QoS 요소의 표준편차를 이용한 표준 값을 구하여 QoS 요소의 값의 특성을 반영하였다. 또한 매칭 결과 순위가 높은 것이 사용자에게 더 선호되는 좋은 서비스라는 것을 보장하는 메커니즘을 제안하였다.