Yoo-Jung Kim

Architecture for implementing the mobile government services in Korea

Each nation’s architecture for the m-Government including Korea’s is being laid out somewhat differently according to its strategy, approach, and its own structural conditions and challenges. Despite such differences, all of them are making numerous efforts to establish the advanced service architecture for the m-Government. In the meantime, they are confused in securing and managing strategic resources which are needed to create constant mobile values, diversifying wired and wireless connection sections, and dealing with technological complexities and differences in various kinds of mobile technologies. Therefore, this study proposes the m-Government service architecture, which can effectively provide nationwide m-Governmental services. It also defines key components of the m-Government service architecture and specific characteristics of applied technologies.

TCP performance enhancement based on virtual receive buffer with PID control mechanism

TCP is the only protocol widely available for reliable end-to-end congestion-controlled network communication, and thus it is the one used for almost all communications. Unfortunately, TCP is not designed with high-performance networking and computing. Thus the research for TCP to obtain good throughput in high-performance networking and computing is in progress all over the world actively. In this paper, we propose a new scheme which makes a TCP system achieve high throughput even with small buffer. The receive buffer almost empties due to the characteristic of original TCP but the amount of physical memory assigned for the buffer cannot be reduced because TCP flow control will downgrade TCP performance with the reduced buffer. However a TCP system applying our proposed scheme can reduce the size of physically assigned receive buffer without downgrading TCP performance. And then we use PID control mechanism as a tool to adjust the size of VRB properly. Lastly, we compare the throughput with two schemes, proposed scheme and original TCP scheme. As a result, the TCP using VRB obtains 46% higher throughput than the original one. And we also compare the amount of memory necessary for achieving the maximum throughput between two schemes. The result of second comparison shows that the proposed TCP spends 43% less memory than the tuned original TCP for same throughput.