http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
초음속 노즐에서 발생하는 비대칭 유동의 제어에 관한 연구
S. Matsuo,T. Setoguchi,T. Hashimoto,S. Tokuda,J. Nagao,김희동 한국가시화정보학회 2011 한국가시화정보학회지 Vol.9 No.2
Several previous works on rocket nozzle flows have revealed the existence of the transition from FSS to RSS and the occurrence of asymmetric flow associated with the boundary layer separation, which can cause excessive side-loads of the propulsion system. Thus, it is of practical importance to investigate the asymmetric flow behaviors of the propulsion nozzle and to develop its control method. In the present study, the asymmetric flow control method using a cavity system was applied to supersonic nozzle flow. Time-dependent asymmetric flow was experimentally investigated with the rate of change of the nozzle pressure ratio. The results obtained showed that the cavity system installed on nozzle wall would be helpful in fixing the unsteady motions of the boundary layer separation, consequently reducing the possibility of the occurrence of the asymmetric flow.
Yang, K.S.,Choi, S.T.,Kim, Y.H.,Nishi, S.,Shimizu, S.,Tokuda, K. IEE 2004 Electronics letters Vol.40 No.22
A 60 GHz highly integrated small mobile terminal with integrated IF modem for the radio-on-fibre millimetre-wave communication system is presented. This terminal integrates a 60 GHz transmitter, receiver and IF modem in one module. It has the characteristics of high data rate, small volume and pico-cell service application.
A 60-GHz point-to-multipoint millimeter-wave fiber-radio communication system
Choi, Sung Tae,Yang, Ki Seok,Nishi, S.,Shimizu, S.,Tokuda, K.,Kim, Yong Hoon Professional Technical Group on Microwace Theory a 2006 IEEE transactions on microwave theory and techniqu Vol.54 No.5
A 60-GHz point-to-multipoint wireless access link with data rate of 156 Mb/s incorporating 60-GHz transceiver modules and full-duplex fiber-optic millimeter-wave transmission is developed for short-range applications such as indoor wireless local area networks and intelligent transport systems. For compact system configuration, a small-size millimeter-wave transceiver module with planar antennas is developed. The transceiver module is based on broadband planar integration and packaging of millimeter-wave circuits. The RF output power is +10 dBm and the measured 3-dB antenna beamwidth is 30°. The total size of the developed 60-GHz transceiver module, except input and output connectors, is 50 mm × 75 mm × 35 mm. A point-to-point full duplex fiber-optic configuration is extended to the scheme with multiple access points (APs) by using a tree coupler and a dense wavelength division multiplexing multiplexer. The AP has a simple configuration without frequency conversion. The bit error rate and packet error rate performances of the 60-GHz fiber-radio access link are evaluated. Furthermore, the effect of the extension to the scheme with multiple APs is investigated.