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Hiroshi Ochi,Yoshitaka Watanabe,Takuya Shimura,Takehito Hattori 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
To achieve high-speed acoustic data transmission, the use of a frequency band of 80 ± 20 kHz is being considered. However, the absorption attenuation coefficient in these frequencies only has empirical formula. Therefore,the absorption attenuation was measured using the frequency of 60 to 100 kHz within the propagation distance of 530 to 700 m at approximately 1,000 m depth. The transmission signal wave form was measured with conductivity,temperature, and depth (CTD) data. From these measured data, the absorption attenuation coefficient was calculatedusing several empirical equations. Calculated value of absorption attenuation coefficients by using measured signal were compared with calculated value by several empirical equations. As a result, a corresponding comparatively good for the empirical formula of Francois and Garrison.
A Design of FIR Filter Using CSD with Minimum Number of Registers
Suzuki, Kenichi,Ochi, Hiroshi,Kinjo, Shigenori 대한전자공학회 1996 APCCAS:Asia Pacific Conference on Circuits And Sys Vol.1 No.1
This paper proposes an algorithm to be used for VLSI design of FIR filter using a canonical signed digit (CSD) representation with a minimum number of registers. The coefficients represented by CSD have a common digit pattern, so that they can reduce the number of adders to calculate same digit patterns. The proposed method takes advantage of this technique without using more registers than that of the transfer function.
Noboru Hasegawa,Akira Sasaki,Hiroshi Yamatani,Maki Kishimoto,Momoko Tanaka,Yoshihiro Ochi,Masaharu Nishikino,Yuichi Kunieda,,Hitoki Yoneda,Atsushi Iwamae 한국광학회 2009 Current Optics and Photonics Vol.13 No.1
We attempted the first measurement of the spectral width of the nickel-like molybdenum x-ray laser ( = 18.895 nm) by use of a high-resolution spectrometer in order to determine the strength of the magnetic field required for the generation of a circularly polarized x-ray laser. The spectral width was measured to be = 18 mÅ under the substantial lasing condition. The magnetic field required for the generation of a circularly polarized x-ray laser was 40 T. The splitting of the x-ray laser line was clearly obtained under 15 T external magnetic field. The strength of the magnetic field estimated from the splitting of the x-ray laser line was large compared with the external magnetic field. It implies that there might be an alternative mechanism for enhancement of the magnetic field in the gain medium plasma.
A Novel Frame Synchronization for MIMO-OFDM Transmission System
Yuhei Nagao,Kenichi Kubo,Masayuki Kurosaki,Hiroshi Ochi 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
MIMO-OFDM system, such as IEEE802.11n wireless LAN and IEEE802.16e wireless MAN, employs cyclic shift diversity transmission in order to avoid unintended beam-forming. However, such system reduces the accuracy of frame synchronization due to large value of channel root mean square (RMS) delay spread, which is observed at receiver. This paper proposes a novel frame synchronization scheme for high accuracy in large RMS delay spread channel environment. The simulation results show that the proposed scheme can improve the performance of the packet error rate and synchronization error rate in IEEE802.11 TGn channel model B with the RMS delay spread of 15[㎱] and model E with RMS delay spread of 100[㎱].
A Low Power, Low Supply Voltage, and Wide dB-Linear Range Pseudo-Exponential Function Generator
Laksono Widyo Isworo,Cosy Muto,Hiroshi Ochi 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
A new topology of pseudo-exponential function generator, which features low supply voltage (1.2V), low power (0.3㎽), and wide ㏈-linear range (120 ㏈), is proposed. Its rail-to-rail topology results in an improved implementation of the pseudo-exponential function to achieve wider ㏈-linear range. These features make the pseudo-exponential function generator suitable for realizing very wide gain range variable gain amplifier (VGA). The pseudo-exponential function generator is simulated in 90㎚ CMOS technology and verified by ADS simulation. The comparison between the proposed topology and the reference topology is also presented.