Cooperative systems are ubiquitous nowadays. In a cooperative system, end users contribute resource to run the service instead of only receiving the service passively from the system. For example, users upload and comment pictures and videos on Flicker and YouTube, users submit and vote on news articles on Digg. As another example, users in BitTorrent contribute bandwidth and storage to help ea...

For the quality of communication as multiple-input multipleoutput (MIMO), the cooperative scheme has been widely used in the wireless communication system. One of the cooperative schemes is spacetime cyclic delay diversity (STCDD). In this paper, a cooperative transmission scheme using two sources and applying STCDD is proposed. When a destination is distant from a source, the system uses two s...

In this paper we present the COMODIN (COoperative Media On-Demand on the InterNet) system, a media on-demand platform for synchronous cooperative work, which is aimed at securely supporting an explicitly-formed cooperative group of distributed users for (i) requesting an archived multimedia session, (ii) sharing the playback, and (iii) collaborating with each other through questioning and, opti...