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Oura Kazuyori,Wada Hideo,Koyama Masatoshi,Maemoto Toshihiko,Sasa Shigehiko 한국정보디스플레이학회 2022 Journal of information display Vol.23 No.1
A bilayer thin-film transistor (TFT) structure with ZnO and Al-doped ZnO (AZO) was fabricated using a solution process. The film thickness and sintering atmosphere of ZnO and AZO were controlled and then evaluated by measuring their electrical characteristics. By changing the sintering atmosphere, carriers attributed to oxygen vacancies in the thin film increased. Moreover, the ZnO single-layer TFT sintered in N2 exhibited good electrical characteristics. In the ZnO/AZO bilayer TFT laminated with the ZnO sintered in N2 and high-resistance AZO thin films, electrical characteristics, such as the On/Off ratio and subthreshold swing, improved compared to those of the ZnO-TFT. The On/Off ratio of the ZnO/AZO-TFT using the AZO thin film sintered in an O2 atmosphere notably improved to 3.7×105 compared to that of the ZnO-TFT (1.7×104). In addition, the subthreshold swing in the ZnO/AZO-TFT was 0.36 V/dec, while the field-effect mobility was 2.2×10−1 cm2/Vs, thereby exhibiting the best electrical characteristics among the fabricated samples. According to the grazingincidence X-ray diffraction measurement, the ZnO particle size and crystallinity of the ZnO/AZO bilayer were higher than those of the ZnO single layer. Therefore, improvement of the electrical characteristics was confirmed.
A Method of Estimating Motion Trajectory with Combining Particle Filter and Optical Flow
Junichi Oura,Teruo Yamaguchi,Hiroshi Harada 제어로봇시스템학회 2014 제어로봇시스템학회 국제학술대회 논문집 Vol.2014 No.10
In our previous research, it was proved that accuracy and efficiency of object tracking increase when we combined a particle filter and optical flow. At a boundary between object and background in the image, however, trajectory of motion turned away from the correct direction. By using Hesse matrix that consists of the derivatives about the brightness, each particle’s position was decided whether it was near the boundary or not, and it enabled particles to avoid such area. As a result, the incorrect trajectories of motion were decreased. In addition, by improving the resampling process, particles have correct velocity were increased. However, in a particular object, its trajectories were broken off on the way. In brief, the tracking failed in regard to such an object. So far, the regions whose exact speed was easy to calculate could be tracked appropriately, but the objects whose inside consist of parts such as edges could not be tracked and their trajectories were broken off.
Neutron and Proton Measurements of Cylindrical Radially Convergent Beam Fusion
sonoe Oura,Akitoshi Okino,Eiki Hotta,Kunihito Yamauchi,Masato Watanabe,Morimasa Yuura,Toshiyuki Kohno 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
Radially convergent beam fusion (RCBF) has been studied for practical use as a portable neutron/ proton source for various applications such as landmine detection and medical positron emission tomography. However, some problems remain for practical use, and the most critical one is the insufficiency of absolute neutron/proton yields. In this study, a new RCBF device was designed and tested to obtain higher neutron/proton yields. The key features of the new device are the cylindrical electrode configuration in consideration of better electrostatic confinement of ions and extraction of protons, and an integrated ion source. From the experiments using deuterium gas, it was confirmed that the ion source works effectively. At the same discharge condition of voltage and current, the obtained neutron production rate was about one order of magnitude higher than that of the conventional spherical RCBF device. A maximum neutron production rate of 6.8 × 109 n/s was obtained at a pulsed discharge of .70 kV, 10 A. For application as a proton source, proton yield in the RCBF device should be investigated, but the RCBF device also produces X-rays and electrons. To count protons by Solid-State Detector (SSD), it is necessary to eliminate these X-rays and electrons. Therefore, a new proton-counting system that has been designed has three magnetic deflectors. The SSD position was determined by a calculation of the proton trajectory.bt
극소전계전자방출 전류밀도 검출을 위한 센싱 시스템 개발
류정탁,K., Oura,김연보 대구대학교 정보통신연구소 2003 情報通信硏究 Vol.1 No.2
본 연구에서 개발된 전계전자방출 측정 시스템은 FE(field emission) 디바이스 전체에 대한 전기적 특성을 평가할 수 있을 뿐만 아니라 극미소한 영역에 대한 전계적 특성도 측정할 수 있다. 따라서 FE 디바이스의 물리적 및 전기적 특성을 보다 정밀하게 마이크로 단위로 평가할 수 있어 우수한 FE 디바이스의 개발 및 개선에 큰 도움을 줄 수 있다. 또한 이 극소전계전자방출 측정 시스템은 FE 디바이스가 전계에 의해 방출하는 전류밀도를 2차원적 및 3차원적으로 표시가 가능하므로 FE 디바이스의 특성을 직관적으로 평가할 수 있다. In this research, we developed the electric field electron emission measurement system of new form. This system can measure electric field characteristic about a microscopic area as well as all over area of a field emission (FE) device. Therefore, this system can give big help in development and improvement of more superior FE device because of measurement capacity for physical and electric property of FE device about a microscopic area. Also, we can intuitionally evaluate FE device characterization, because this system displays possible two-dimensional and three-dimensional current density emitted from FE device by electric field.