Chi-Hoon Shin

Selective multiplexer-removal algorithm for lowering power consumption of circuits

In this paper we propose an algorithm about aggressive, but partial removal of multiplexers used for sharing functional units (FUs). By eliminating some multiplexers and duplicating the FU related, the proposed algorithm could be more advantageous for low power circuits than just keeping the multiplexers. To determine whether a removal of a group of multiplexers is beneficial or not, we compared a FU with multiplexers to multiple replications of the FU without any multiplexer under various conditions. Through the experiments, we aggregated information to be used for finding appropriate multiplexers to be extricated from circuit netlist; using the information, we built an automated algorithm to remove particular multiplexers; we applied it to a netlist of 16 bit processor. The processor that is newly generated by the algorithm consumed average about 12% less power than the initial processor.

LATONA: an advanced server architecture for ubiquitous sensor network

The emerging Ubiquitous Sensor Network (USN) makes connection less datagrams and short event packets get popular. A large number of short term event packets of USN can cause serious problems, such as interrupt handling overhead and context switching overhead. Furthermore, heavy load of the packet security methods needs enough processing power. Then, the more USN develops, the more network overheads would be loaded into host CPU. To solve the problems, we propose a special server component including TOE (TCP/IP Offloading Engine) and H/W IPSec (IP Layer Security) for USN.