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)
The logistics system gets evolved into autonomous cooperating meta-system through adopting system-of-system theory. Since logistics meta-system operates in tentative environment, its architecture and operation endure dynamic complexity from the viewpoint of dependability management. Moreover, its dependability such as performance, reliability and life(More)
In this paper, we analyze the conversion profit when campus web servers are integrated into a cloud computer. We first investigate the cost of legacy system model of campus web servers operated by individual laboratories, departments, institutes and so on. Next, we set up a cloud computer model for the integrated web services meeting the same performance(More)