Changyeol Choi

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The recent advance in wireless network technologies has enabled the streaming media service on the mobile devices such as PDAs and cellular phones. Since the wireless network has low bandwidth channels and mobile devices are actually composed of limited hardware specifications, the transcoding technology is needed to adapt streaming media to the given(More)
In this paper, we propose a new patching scheme, called P2Prefix patching, to improve the performance of the typical patching technique by using both the prefix patching from clients and the regular stream multicast from the server. In our proposed scheme, each client plays the role of a patching server to serve a prefix stream to other clients that request(More)
For Video-On-Demand (VOD) systems, it is important to provide Quality of Service (QoS) to more clients under limited resources. In this paper, the performance scalability in cluster-based VOD servers is studied with several grouping configurations of cluster nodes. To find performance bottlenecks, the monitoring functions are employed and the maximum QoS(More)
Multiview broadcasting has recently gained much attraction from academic and commercial fields because it can deliver the immersive viewing of natural scenes. Therefore, various researches implementing multi-view video broadcasting have been conducted with a variety of different system architectures. However, the previous systems have focused on wired(More)
Due to the limited resources in thin-clients on mobile devices and the large amount of computation for decoding streaming media, it is not easy to support the QoS of streaming media for thin-client on mobile environment. To solve the problems, the terminal servers would be charged for decoding the streaming media and thin-clients have a role to update only(More)
Ubiquitous computing is about networked processors, which is constructed not only with one computer but with networks of computers. Security solutions usually lack a clear definition of survivality. Thus, this paper deals with a method of quantitatively assessing the system security based on the survivality. Since a logical step towards modeling survivality(More)
In this paper, we propose a new broadcasting scheme, called P2P broadcasting, for eliminating the service latency time of the existing broadcasting schemes. Our broadcasting scheme is based on the simplest staggered broadcasting protocol and then we use peer to peer caching technique, in which a number of clients that share a segment of a stream delivered(More)