Browsing by Author "Li, CF"

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A low-power ASIC design for cell search in the W-CDMA system
(2004-05-01)
Li, CF
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Chu, YS
;
Sheen, WH
;
Tian, FC
;
Ho, JS
This paper presents a low-power ASIC design for cell search in the wideband code-division multiple-access (W-CDMA) system. A low-complexity algorithm that is able to work satisfactorily under the effect of large frequency and clock errors is designed first. Then, a set of low-power measures are employed in the design of hardware architecture and circuits. Finally, through power analysis, critical blocks are identified and redesigned so as to further reduce the power consumption. The final design shows that the power is reduced by 51 % from the original design of 133.6 mW to 65.49 mW, and its core area is also reduced by 31.9% from 3.4 x 3.4 mm(2) to 2.8 x 2.8 mm(2). The design is implemented and verified in a 3.3-V 0.35-mum CMOS technology with clock rate 1 36 MHz.
Removal characteristics of H2S by Thiobacillus novellus CH 3 biofilter in autotrophic and mixotrophic environments
(1997)
Chung, YC
;
Huang, CP
;
Li, CF
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環境工程研究所
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Institute of Environmental Engineering
Thiobacillus novellus, like other facultative chemoautotrophs, possesses the unique ability to grow autotrophically as well as heterotrophically. Since in nature the bacteria are likely to encounter different environments, i.e., autotrophic, heterotrophic, or mixotrophic conditions, it is of considerable interest to determine the removal characteristics of H2S in different environments. Thiobacillus novellus CH 3 was isolated from piggery wastewater and used to remove H2S gas from air in this study. The results indicated that the Thiobacillus novellus biofilter under mixotrophic conditions possessed broad adaptability of pH (5 - 10) compared to the one under autotrophic conditions. In a batch experiment high H2S concentration (>140 ppm) inhibited the enzymatic activity, thus the H2S removal was limited by the reaction rate rather than the diffusion rate at diluted H2S concentration. During the environmental shock experiment, 99.5% of the H2S content from the inlet was eliminated in a misotrophic environment, but only 97.5% was eliminated in an autotrophic environment. Moreover, the misotrophic biofilter possessed higher removal capacity than the autotrophic biofilter. Thus, the results suggest that the potential of Thiobacillus novellus CH 3 in the mixotrophic environment should be of selective advantage over the cells in the autotrophic environment.