• The KIPS Transactions:PartC
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• v.9C no.5
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• pp.757-764
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• 2002

This Paper describes our experiences with the design and implementation of a networked multimedia information management system in an object-oriented framework for distributed multimedia applications, and an integrated QoS-resource negotiation protocol which has been applied to a video server in our networked multimedia infrastructure. The salient features of our framework to support efficient multimedia streaming are explained. Next the paper explores the challenges faced in integrating the proposed QoS negotiation policy into the framework.

• Convergence Security Journal
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• v.7 no.1
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• pp.77-82
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• 2007

Supporting Quality of Service (QoS) for multimedia services in heterogeneous mobile networks is a part of key issue for Beyond Three Generation (B3G) development. In particular, if QoS degradation are occurred because cell overload and error late patterns of wireless links during the transmission of multimedia data, the efficient QoS management is necessary to maintain the same QoS of transmitted multimedia data because the QoS may be defected by some delay and information loss. This paper deals with QoS Degradation reason Intra-System Handover (D-ISHO) for handling QoS of multimedia services over heterogeneous mobile networks. For this aim, the function modules for supporting QoS of D-ISHO are proposed. The sequence diagram showing interaction between the modules is described and then a scenario for D-ISHO is considered. Simulation is focused on the average delay and packet loss rate. The proposed heterogeneous mobile system using the QoS-Guaranteed Resource Management (QGRM) provides a better performance than each different access system.

• Proceedings of the Korea Information Processing Society Conference
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• 2017.04a
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• pp.183-184
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• 2017

최근, 모바일 디바이스 성능 고도화로 인해 내장된 컴퓨팅 및 스토리지 자원을 이용한 다양한 연구가 활발히 진행되고 있다. 그러나 모바일 디바이스내 제한된 배터리량으로 인해 개발된 많은 어플리케이션을 동작하는 데 원활하지 못한 문제점을 가진다. 최근 연구는 어플리케이션의 몰입감 및 모바일 디바이스의 자체 성능 최적화에 대한 연구가 집중되어 있다. 현재, 분산된 모바일 디바이스내 비가용 유휴 자원을 활용한 연구가 미흡한 단계로 모바일 디바이스의 자원 고가용성을 위한 자원 관리 연구가 필요하다. 기존에 모바일 자원 통합 기법인 Mobile Resource Management(MRM)가 연구되었지만, 작업량 증가에 따라 인프라내 특정 모바일 디바이스의 배터리 소모가 급격히 소모되는 문제점을 내재한다. 따라서 본 논문에서는 MRM 인프라내 특정 모바일 디바이스의 급격한 배터리 소모 방지를 위해 모의적으로 모바일 디바이스 연결 및 작업 수행하여 최적의 작업 분배를 위한 MBC-Sim을 제안한다.

• Proceedings of the Korea Contents Association Conference
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• 2005.11a
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• pp.340-344
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• 2005

For the next generation wireless systems, multimedia services will be highly demanded and needed to transmit the cost-efficient packet data. With this regard, the adaptive resource management methods are preferable to optimally control the various traffic classes in OFDMA (WiBro) systems. We have developed a sub-channel state prediction method based on the past sub-channel state dependency. Using the method, we are developed a scheduling algorithm that can efficiently control multimedia traffic downlink transmissions.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.27 no.6B
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• pp.593-600
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• 2002

The reverse link signal power required for multimedia traffic in multipath faded single-code (SC-) and multi-code CDMA (MC-CDMA) systems is investigated. The effect of orthogonality loss among multiple spreading code channels is herein characterized by the orthogonality factor. The required signal power in both the CDMA systems is then analyzed in terms of the relative required signal power ratio of data to voice traffic. The effect of varying system parameters including spreading bandwidth, the of orthogonality factor, and the number of spreading codes are examined. Analytical results show that MC-CDMA users transmitting only a single traffic type require significantly more power than SC-CDMA users with only a single traffic type. On the other hand, MC-CDMA users transmitting multimedia traffic require power levels approximately identical to SC-CDMA users with multimedia traffic. The results can be used in the design of radio resource management (e.g., power allocation) scheme for wireless multimedia services.

• Journal of Communications and Networks
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• v.14 no.6
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• pp.692-702
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• 2012

Supporting quality of service (QoS) guarantees for diverse multimedia services are the primary concerns for WiMAX (IEEE 802.16) networks. A scheduling scheme that satisfies QoS requirements has become more important for wireless communications. We propose a downlink scheduling scheme called adaptive priority-based downlink scheduling (APDS) for providing QoS guarantees in IEEE 802.16 networks. APDS comprises two major components: Priority assignment and resource allocation. Different service-type connections primarily depend on their QoS requirements to adjust priority assignments and dispatch bandwidth resources dynamically. We consider both starvation avoidance and resource management. Simulation results show that our APDS methodology outperforms the representative scheduling approaches in QoS satisfaction and maintains fairness in starvation prevention.

• IE interfaces
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• v.11 no.1
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• pp.155-163
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• 1998

In multiparty multimedia communication, each participant not only receives information from other participants but also generates real-time data streams to distribute to others and therefore the difference between source and destination is not clear in terms of data transmission. During a teleconference session, many sub-multicast trees may be generated to exchange information to specific members within the multicast group and if those sub-multicast trees use the same fixed multicast tree, the blocking probability will be high and it is hard to provide QoS for each sub-multicast group. Also, even though there exits some shortcuts between each sub-multicast group, fixed multicast tree does not allow to use those shortcuts. Thus to overcome these problems. We propose a network resource reservation protocol and show that its effectiveness in terms of blocking probability and network resources usage.

• Proceedings of the Korea Multimedia Society Conference
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• 2004.05a
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• pp.814-817
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• 2004

그리드는 컴퓨터류만 연결된 기존의 인터넷에 모든 종류의 비컴퓨터류의 기계장치들을 인터넷상에 연결시켜 컴퓨터와 더불어 활용하는 기술을 지칭한다. 즉, 지역적으로 분산되어 있는 컴퓨팅 파워를 공유하여 마치 한 대의 고성능 컴퓨터처럼 사용할 수 있게 해 주는 것을 말한다. 이러한 그리드환경에서 client가 요구하는 작업을 명시하는 표준 RSL(Resource Specification Language)을 이용해 GRAM (Globus Resource Allocation and Management)에 작업을 제출한다. 하지만 기존의 GRAM에서는 특별한 수행 환경을 요구하는 작업을 수행시키는 방법을 알지 못한다. 이에 본 논문에서는 브로커와 상호작용가능한 실행환경정보(Excution Environment Information)를 제안함으로써, GRAM의 특수 수행 환경을 지원 할 수 있게 하였다.

• ETRI Journal
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• v.32 no.2
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• pp.292-301
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• 2010

Increasing convergence among heterogeneous radio networks is expected to be a key feature of future ubiquitous services. The convergence of radio networks in combination with dynamic spectrum allocation (DSA) could be a beneficial means to solve the growing demand for radio spectrum. DSA might enhance the spectrum utilization of involved radio networks to comply with user requirements for high-quality multimedia services. This paper proposes a simple spectrum allocation algorithm and presents an analytical model of dynamic spectrum resource allocation between two networks using a 4-D Markov chain. We argue that there may exist a break-even point for choosing whether or not to adopt DSA in a system. We point out certain circumstances where DSA is not a viable alternative. We also discuss the performance of DSA against the degree of resource sharing using the proposed analytical model and simulations. The presented analytical model is not restricted to DSA, and can be applied to a general resource sharing study.

• Journal of Korea Society of Industrial Information Systems
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• v.10 no.3
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• pp.15-20
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• 2005

Since the invention of Web, it became part of our daily life replacing the routine information search and effecting many activities which otherwise could have been done off-line without it. It was a natural evolution of the web technology, which had started out as a simple test based pattern matching, to be based on the optimized match process for its multi-media Web environment, like still images, music and movies that we are to face today. In this paper, we proposed and implemented the model which the multimedia resources can be efficiently shared in semantic web. After converting multimedia resource information(metadata) into RDF, for efficient management, the model separate and allotment actual multimedia resource and corresponding metadata changed to RDF to each server. The proposed model could be applied in all multimedia resources. For easy explanation and implementation, however, we applied it to the digital photograph in example.