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Logarithmic temperature dependence of resistivity in CVD graphene
Kanji Takehana,Yasutaka Imanaka,Eiichiro Watanabe,Hirotaka Oosato,Daiju Tsuya,김용민,안기석 한국물리학회 2017 Current Applied Physics Vol.17 No.4
Logarithmical increase of the longitudinal resistivity (rxx) between 10 K and 80 K and its saturation at low temperature were observed in the graphene synthesized by the chemical vapor deposition (CVD) with various applied gate voltage. In the two-dimensional system, it is considerably difficult to identify the origin of the logarithmic temperature (Log-T) increase of the resistivity, because there are three corrections to exhibit the Log-T behavior: the weak localization, the electron-electron interaction (EEI) in the disordered system and the Kondo effect. In order to distinguish the origin of the Log-T behavior, we contrived a new method utilizing the magnetotransport property in tilted magnetic fields. As a result, we have assigned the Log-T behavior in the CVD graphene to the correction of the EEI.
Mallard Detection using Microphone Array and Delay-and-Sum Beamforming
Masumi Hashimoto,Hirokazu Madokoro,Kanji Watanabe,Masayuki Nishiguchi,Satoshi Yamamoto,Hanwool Woo,Kazuhito Sato 제어로봇시스템학회 2019 제어로봇시스템학회 국제학술대회 논문집 Vol.2019 No.10
This paper presents a method of estimating the direction and position of mallards from voice information using arrayed microphones combined with delay-and-sum beamforming. Rice farming using mallards saves labor because mallards work instead of farmers. Nevertheless, the number of mallards declines when they are preyed upon by natural enemies such as crows, kites, and weasels. We consider that efficient management can be achieved from locating and identifying the locations of mallards and natural enemies using voice information that can be widely sensed in a paddy field. For this study, we developed a prototype system with 32 microphones installed as an array installed on our originally designed and assembled mount. We obtained benchmark sound datasets in an outdoor environment that comprises 18 grid points of 40 m width and 30 m depth. For direction estimation, no detection angle error occurred at 9 points. Estimation errors were increased at sharp-angle positions from the microphone array. For position estimation, our method correctly estimated 8 points.