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Al-doped ZnO (AZO) films with different boron (B) content have been prepared on glass substrates by co-sputtering of AZO (2wt. % Al 2 O 3 ) and B-doped ZnO (BZO, 3wt. % B 2 O 3 ) targets at room temperature. The B content in the B-doped AZO (BAZO) film was controlled by DC power on BZO target. X-ray diffraction analysis indicated that the B-doping improved the crystalline structure of AZO film. Hall measurement analysis showed that resistivity of BAZO films was lowered to 2.06×10−3 Ω·cm, whereas that of AZO film was 5.68×10−3 Ω·cm. Hall mobility of AZO film was improved with appropriate B-doping, and carrier concentration was increased with B-doping due to B activation as a donor.

In this paper, a robust self-tuning controller for a velocity control of permanent magnet type stepping motor is proposed‥ The self-tuning theory provides a nonlinear modeling of a stepping motor drive system and could provide the controller with information regarding the reference variation, system noise, and parameter variation of the stepping motor through the on-line estimation. Thus, the proposed self-tuning controller can change the gains of the controller according to system conditions. The availability of the proposed controller is verified through experiment results.

In this paper, the authors have proposed and fabricated a new bi-directional T-shaped triple-gate structure for reduction of kink current in poly-Si TFTs fabricated by SLS crystallization method. The mobility of TFT parallel channel direction with laser crystallization direction is 169.87cm2/Vs and the mobility of TFT perpendicular channel direction with laser crystallization direction is 64.28cm2/Vs respectively. The different channel structure is used in the proposed device instead of using asymmetric gate channel length, and then the proposed bi-directional T-shaped Triple-gate structure could be fabricated by normal LTPS process without any limitation of device design rules.