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Crystallization by Green-laser Annealing for Three-dimensional Device Application
Yumi Kawamura,Koji Yamasaki,Takehiko Yamashita,Yuta Sugawara,Yukiharu Uraoka,Mutsumi Kimura 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.56 No.5
We report the crystallization of multilayer polycrystalline Si (poly-Si) thin films by green laser annealing with potential applications to three-dimensional devices. We investigated single-, doubleand triple-layer poly-Si thin films crystallized by GLA. The crystallinity of the green-laser-annealed (GLA) poly-Si films was improved by employing a multilayer structure; larger crystal grains were obtained at a lower power than the case of a single layer. We applied the GLA multilayer poly-Si thin films to the fabrication of thin film transistors (TFTs) and thin-film photodiodes. Through a comparison of their performance, we demonstrated the superiority of multilayer crystallization.
Algorithm detecting low arousal states of car drivers based on the driver’s eye blinking pattern
Keisuke Suzuki,Kiichi Yamada,Yumie Minakami,Hiroyuki Kawamura 대한인간공학회 2010 대한인간공학회 학술대회논문집 Vol.2010 No.5
In this study, five kinds of state variables characterizing the eye blinking behavior for detecting low arousal level of car drivers were investigated. This investigation was carried out in a driving simulator for clarifying what kind of state variables are useful for designing the algorithm of awaking alarm, in terms of minimizing the missing alarms in low arousal condition and the excess alarms in awaking condition simultaneously. In applying the ratio regarding closing/opening time of eyelid and the variation of this ratio for designing the algorithm, the time frequency of the missing alarms was approximately 1.5 % and extremely lower than the conditions when the algorithm was based on the other state variables like the total time for eye closing or the opening rate of eyelid. The excess alarms in applying this algorithm are also lower than the other algorithms. An effectiveness of awaking alarm based on this algorithm was also evaluated and clarified that the awaking effects by the acoustic alarm evaluated in terms of the fluctuation of RRI (ECG) was not sufficient, and the methodology for awaking the driver should be studied.