Browsing by Author "Li, JS"

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Rubbing-induced molecular alignment on a rubbed alkyl-branched polyimide film
(1995)
Huang, JY
;
Li, JS
;
Chen, SH
;
交大名義發表
;
光電工程學系
Rubbing-induced molecular alignment on an alkyl-branched polyimide film with varying unidirectional rubbing strength has been investigated with the use of optical phase retardation measurement, atomic force microscopy (AFM), and second-harmonic generation (SHG). Our AFM images suggest that the rubbing-induced micro-groove should play a minor role in aligning liquid crystal (LC) molecules. The polar angle of the polar head group of a LC monolayer on an alkyl-branched polyimide film was found to vary with the rubbing strength. The results obtained from various experimental techniques can be reconciled with a simple molecular model proposed in this paper.
The effects of Rician fading and multiple CCI on differentially detected GMSK signals
(1997)
Su, YT
;
Kao, WC
;
Li, JS
;
交大名義發表
;
電信工程研究所
The paper presents the bit error rate (BER) analysis of a GMSK system employing various forms of differential detections. The desired signal is assumed to experience Rician fading while multiple co-channel interference (CCI) suffer from Rayleigh fading. The effects of fading rate (fast or slow fading) and time and frequency dispersions are also examined.