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    ABSTRACT: Planning VoD services based on the server architecture and on the available equipment is always a challenging task. We created a mathematical frame model to support the design of distributed multimedia services. The model consists of a (1) static and a (2) dynamic part. The static part enables giving estimations about the available throughput. In the dynamic part of the model, we defined evaluation criteria for VoD services relating to utilization and load balance of the system, video usage, quality of service, client satisfaction and costs. The dynamism of the frame model originates from the possible state transitions which have to be defined in a core model. We show examples how the model works and performs optimizations regarding video placement and client satisfaction.
    01/2006;
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    ABSTRACT: We present an adaptive distributed multimedia server architecture (ADMS) that builds upon the idea of offensive adaptivity, where the server proactively controls its layout through replication or migration of server components to recommended hosts. Proactive actions are taken when network or server resources become critical when fulfilling client demands. Recommendations are provided by a so-called “host recommender” which represents an integral part of Vagabond2 - the middleware used for component distribution. Recommendations are based on measured or estimated server and network resource availabilities. Network distance and host resource metrics - obtained from network and host resource services respectively - may be communicated as MPEG-21 DIA descriptors. Finally we evaluate our architecture in a real-world streaming scenario.
    Proceedings of Information Technologies and Communications (ITCom), Internet Multimedia Management Systems IV, Orlando, USA; 01/2003
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    ABSTRACT: Multimedia services are becoming widespread over the Internet. Large amount of resources are needed to deliver multimedia data with high quality and it is a quite difficult task to set up and scale video servers to comply with expectations. We developed a formal frame model to support the design of distributed video servers, the evaluation of their behaviour and the control of the server activities. It is a general model that can be customised to different architectures. The model enables giving estimations about the available throughput and defines utilization, balance and economic functions. State transition rules can be defined as well to specify dynamic adaptation steps for the server.
    Methods and tools for development of semantic enabled systems and services for multimedia content, interoperability and reusability; 08/2006

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