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Mechanical circulatory support systems at Tokyo Medical and Dental University

Ohuchi K., Hoshi H., Watanabe N., Kido K., Yokoyama Y., Asama J., Shinshi T., Shimokohbe A., Yoshikawa M., Takatani M.

Biocybernetics and Biomedical Engineering

2007

Vol. 27, no. 1-2

161-167

This paper describes mechanical circulatory support devices (MCSD) which are under development at Tokyo Medical and Dental University in collaboration with Tokyo Institute of Technology. They include para-corporeal magnetic levitated (Mag-lev) centrifugal blood pump, implantable Mag-lev centrifugal blood pump, extra-corporeal pediatric centrifugal blood pump, and implantable pulsatile ventricular assist device (VAD) and totally replacement artificial heart system.

Effect of unequal power allocation in turbo coded multi-route multi-hop networks

Wada T., Jamalipour A., Ohuchi K., Okada H., Saito M.

Journal of Telecommunications and Information Technology

2006

nr 1

46-53

Multi-hop ad hoc networks are promising candidates for next generation mobile communications. They have sufficient channel capacity to achieve high data rate transmission for large number of users. One advantage of multi-hop networks is to realize multi-route transmissions. Since information bit streams can be transmitted over multiple routes, we can obtain route diversity effect. In order to enhance the route diversity effect, we usually introduce forward error correction schemes. Turbo coding is one of suitable coding methods for multi-hop networks. The turbo encoder generates one message stream and two parity streams whilst the message stream is more important than the parity streams for achieving reliable communications. Thus an unequal power allocation to the message and parity streams could be effective in improving the performance. In this paper, the effect of unequal power allocation for turbo coded multi-hop networks is investigated. Assuming the channel as additive white Gaussian and binary symmetric, we will show considerable performance improvement by unequal power allocation in terms of the bit error rate performance in multi-route multi-hop networks.