Tae-Young Chang

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we present a medium access control (MAC) protocol for ad hoc networks with multiple input multiple output (MIMO) links. MIMO links provide extremely high spectral efficiencies in multipath channels by simultaneously transmitting multiple independent data streams in the same channel. MAC protocols have been proposed in related work for ad hoc networks with(More)
A tremendous amount of research has been done toward improving transport layer performance over wireless data networks. The improved transport layer protocols are typically application-unaware. In this paper, we argue that the behavior of applications can and do dominate the actual performance experienced. More importantly, we show that for practical(More)
In this paper, we consider the problem of file synchronization when a mobile host shares files with a backbone file server in a network file system. Several <i>diff</i> schemes have been proposed to improve upon the transfer overheads of conventional file synchronization approaches which use full file transfer. These schemes compute the binary <i>diff</i>(More)
Current popular Web browsers simply fetch the entire Web page from the server in a greedy fashion. This simple Web-fetching mechanism employed by browsers is inappropriate for use in low-bandwidth networks since they unnecessarily cause large response time for users. In this paper, we first analyze the reasons that cause large response time by considering(More)
Although lateral pelvic node dissection (LPND) is recommended for rectal cancer with clinically metastatic lateral pelvic lymph nodes (LPNs), LPNs may respond to neoadjuvant chemoradiotherapy (nCRT). Our aim was to determine the optimal indication for LPND after nCRT for mid/low rectal cancer. Of 2,263 patients with clinical stage II/III mid/low rectal(More)
A tremendous amount of research has been done toward improving transport-layer performance over wireless data networks. The improved transport layer protocols are typically application-unaware. In this paper, we argue that the behavior of applications can and does dominate the actual performance experienced. More importantly, we show that for practical(More)
Although one is made to believe that a collaborative application that runs on a collection of heterogeneous mobile devices can be easily developed with the existing middleware technologies such as JXTA, BREW, compact .NET and J2ME, the reality is that they require too many ad-hoc techniques as well as cumbersome and timeconsuming programming. Our System on(More)
Current popular web-browsers simply fetch the entire web-page from the server in a greedy fashion. This simple web fetching mechanism employed by browsers is inappropriate for use in low-bandwidth networks, since they cause large response times for users unneccesarily. In this paper, we first analyze the reasons that cause large response times by(More)