Browsing by Author "Tsai, SY"

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Fatigue reliability evaluation for composite laminates via a direct numerical integration technique
(1998-05-01)
Kam, TY
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Chu, KH
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Tsai, SY
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機械工程學系
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Department of Mechanical Engineering
A direct numerical integration technique for evaluating Fatigue reliability of composite laminates under varying stress amplitudes is presented. A number of cumulative damage models are adopted to construct the limit state equation for the laminates in the reliability analysis. Existing fatigue life distributions of composite laminates under cyclic stresses of constant amplitude are used in the reliability assessment of the composite laminates under varying stress amplitudes. The accuracy of the proposed method in fatigue reliability prediction is then verified by experimental Fatigue life data of varying stress amplitudes. A comparison between the present method and the modified beta-method is also made to illustrate the suitability of the present method in fatigue reliability prediction. (C) 1998 Elsevier Science Ltd.
Optical disk mastering using optical superresolution technique
(2001-03-01)
Shieh, HPD
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Tsai, SY
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Peng, YH
;
Hsieh, TE
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材料科學與工程學系
A new laser lithography technique using the effect of optical superresolution can effectively reduce the exposed spot size on a photoresist layer, thus allowing disk mastering toward higher density using an existing light source and optics. A thin metallic mask layer deposited on the top of the photoresist layer is used to obtain a "below optical diffraction limit" linewidth on the photoresist layer. The feasibility of the laser lithography technique, as evaluated by simulation and experimental results, revealed that the linewidth on the photoresist layer could be shrunk by more than 50% of the diffraction limit of the optical system.
Performance comparisons between direct NRZ and gain-switched RZ modulation on Fabry-Perot lasers
(2005)
Peng, WR
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Peng, PC
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Chen, J
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Tsai, SY
;
Chi, S
We firstly study the performance comparisons between direct non-return to zero and gain-switched return to zero data formats on a Fabry-Perot laser. With high speed electrical AND gate, we also investigate the relation between the pulse width of electrical drive signal and the quality of optical eye diagrams. It is found that shorter pulse width of electrical signal can completely eliminate the pattern effect and the sensitivity of RZ format is 3.8-dB better than NRZ format at data rate = 2.488-Gbps.