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A 4Mbps INFRARED WIRELESS COMMUNICATION SYSTEM DEDICATED TO MOBILE COMPUTING
Uno, Hiroshi,kumatani, Keiji,Okuhata, Hiroyuki,shirakawa, Isao,Chiba, Toru 대한전자공학회 1996 APCCAS:Asia Pacific Conference on Circuits And Sys Vol.1 No.1
A high performance and low power architecture is devised for a 4Mbps infrared wireless communication system dedicated to the mobile computing. In this architecture, 4PPM(4-Pulse Position Modulation) infrared signals detected by an infrared receiver are digitized into TTL interface level pulses, and the digitized pulses are demodulated by a 1-bit digital demodulator. To improve the dynamic range of the link length, a 4PPM demodulator is synthesized to implement a demodulation algorithm which is constructed so as to accommodate the output tolerance of the infrared receiver. A part of experimental results shows that the realized 4Mbps infrared communication system can achieve an error free link in the range of 0-140cm at 90mW power consumption.
Design Optimization of Single-Stage Launch Vehicle Using Hybrid Rocket Engine
Kanazaki, Masahiro,Ariyairt, Atthaphon,Yoda, Hideyuki,Ito, Kazuma,Chiba, Kazuhisa,Kitagawa, Koki,Shimada, Toru The Society for Aerospace System Engineering 2015 International Journal of Aerospace System Engineer Vol.2 No.2
The multidisciplinary design optimization (MDO) of a launch vehicle (LV) with a hybrid rocket engine (HRE) was carried out to investigate the ability of an HRE for a single-stage LV. The non-dominated sorting genetic algorithm-II (NSGA-II) was employed to solve two design problems. The design problems were formulated as two-objective cases involving maximization of the downrange distance over the target flight altitude and minimization of the gross weight, for two target altitudes: 50.0 km and 100.0 km. Each objective function was empirically estimated. Several non-dominated solutions were obtained using the NSGA-II for each design problem, and in each case, a trade-off was observed between the two objective functions. The results for the two design problem indicate that economical performance of the LV is limited with the HRE in terms of the maximum downrange distances achievable. The LV geometries determined from the non-dominated solutions were examined.