Browsing by Author "Lo, Wan-Ting"

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Agglomerative-Based Flip-Flop Merging and Relocation for Signal Wirelength and Clock Tree Optimization
(2013-07-01)
Liu, Sean Shih-Ying
;
Lo, Wan-Ting
;
Lee, Chieh-Jui
;
Chen, Hung-Ming
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電子工程學系及電子研究所
In this article, we propose a flip-flop merging algorithm based on agglomerative clustering. Compared to previous state-of-the-art on flip-flop merging, our proposed algorithm outperforms that of Chang et al. [2010] and Wang et al. [2011] in all aspects, including number of flip-flop reductions, increase in signal wirelength, displacement of flip-flops, and execution time. Our proposed algorithm also has minimal disruption to original placement. In comparison with Jiang et al. [2011], Wang et al. [2011], and Chang et al. [2010], our proposed algorithm has the least displacement when relocating merged flip-flops. While previous works on flip-flop merging focus on the number of flip-flop reduction, we further evaluate the power consumption of clock tree after flip-flop merging. To further minimize clock tree wirelength, we propose a framework that determines a preferable location for relocated merged flip-flops for clock tree synthesis (CTS). Experimental results show that our CTS-driven flip-flop merging can reduce clock tree wirelength by an average of 7.82% with minimum clock network power consumption compared to all of the previous works.
Synthesis and Characterization of Poly(n-undecyl isocyanate)/Polyaniline Polyblend
(2010-07-05)
Li, Yu-Jen
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Ho, Ko-Shan
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Lo, Wan-Ting
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Yang, Shin-Shiao
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Chao, Liang
Poly(n-undecyl isocyanate) (PUDIC)/n-dodecylbenzenesulfonic acid (DBSA)-doped polyaniline (PANIDBSA) polyblend was prepared and the effect of the H-bonding between these two polymers on the compatibility, conjugation chain length of PANIDBSA, and helixity of PUDIC in the polyblend system were studied. The monomer and polymer were characterized by NMR spectra and the polyblend was analyzed by FTIR, UV-vis spectra, and wide-angle X-ray diffraction. It was found when the blend composition of the PUDIC was higher than 10%, the WAXD patterns demonstrated lower angle shifting for the peaks at around 2 theta = 2-2.5 degrees, referring to the distance between the layers of the layered structure of PANIDBSA crystalline with increasing PUDIC, indicating the expansion of the layered structure of PANIDBSA. The FTIR spectra illustrated the presence of an absorption peak at 1700 cm(-1) shift to higher wave number with PUDIC due to its H-bonding with PANIDBSA. The UV-vis spectra of PANIDBSA described a blue-shift of the lambda(max) with PUDIC, indicating that the presence of PUDIC in the polyblend system can interrupt and decrease the conjugation chain length of PANIDBSA. The optical activity of the helical PUDIC decreased notably with the presence of PANIDBSA, resulting from the reversed helical effect (de-nature) of H-bonding. (C) 2010 Wiley Periodicals, Inc. J Appl Polym Sci 117: 1-7, 2010