Browsing by Author "Liu, C. J."

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Common-Acoustic-Poles and Zeros Modeling Using Jointly Balanced Model Truncation
(2009)
Liu, C. J.
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Hsieh, Shih-Fu
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電子工程學系及電子研究所
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Department of Electronics Engineering and Institute of Electronics
We propose a new technique for common-acoustic-poles and zeros (CAPZ) modeling. In 3-D sound processing, head-related transfer functions (HRTF's) record channels' characteristics from different locations to both ears. Compared to conventional pole/zero models, it is more efficient to model HRTF's by using CAPZ modeling. Based on balanced model truncation (BMT), jointly BMT is proposed to effectively model a group of HRTF's using common-poles IIR filters. The simulation result shows the proposed method is superior to the previous Prony and Shanks methods.
Effects of water intercalation in Na(x)CoO(2)center dot yH(2)O
(2009)
Lin, J. Y.
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Chen, Y. L.
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Hsu, Ben
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Liu, C. J.
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Tai, Y. L.
Water intercalation is necessary for the occurrence of superconductivity in NaxCoO(2) center dot yH(2)O. It is known that water insertion leads to the elongation of the c-axis. Beyond that, it remains controversial about the effects of water intercalation on the electronic structure of Na(x)CoO(2) center dot yH(2)O. In this paper, we report the Co-K edge spectroscopy on y = 0.7 and 1.4 samples, respectively. The spectra are compared with those of the reference samples. It is found that the variation of the Co valence can not be explained by the simple electron counting. These results are consistent with those of the previous chemical titration.