Browsing by Author "Chou, Yu-Jun"

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Decentralized stabilization of H-infinity fuzzy control for nonlinear multiple time-delay interconnected systems
(2007-03-01)
Hsiao, Feng-Hsiag
;
Xu, Sheng-Dong
;
Lin, Chia-Yen
;
Chou, Yu-Jun
;
Chen, Yu-Ching
A robustness design of H infinity fuzzy control is proposed in this paper to overcome the effect of modeling errors between nonlinear multiple time-delay systems and fuzzy models. In terms of Lyapunov's direct method, a stability criterion is derived to guarantee the UUB (uniformly ultimately bounded) stability of nonlinear multiple time-delay interconnected systems with disturbances. Based on this criterion and the decentralized control scheme, a set of fuzzy controllers is then synthesized via the technique of parallel distributed compensation (PDC) to stabilize the nonlinear multiple time-delay interconnected systems and the H infinity control performance is achieved in the mean time.
Decentralized stabilization of Nonlinear multiple time-delay interconnected systems via h-infinity fuzzy control
(2006)
Hsiao, Feng-Hsiag
;
Xu, Sheng-Dong
;
Lin, Chia-Yen
;
Chou, Yu-Jun
;
Chen, Yu-Ching
A robustness design of H-infinity fuzzy control is proposed in this paper to overcome the effect of modeling error between nonlinear multiple time-delay systems and fuzzy models. In terms of Lyapunov\'s direct method, a stability criterion is hence derived to guarantee the UUB (uniformly ultimately bounded) stability of nonlinear multiple time-delay interconnected systems with disturbances. Based on this criterion and the decentralized control scheme, a set of fuzzy controllers is then synthesized via the technique of parallel distributed compensation (PDC) to stabilize the nonlinear multiple time-delay interconnected systems and the H-infinity control performance is achieved in the mean time.
Realization of an H-2/CO dual-gas sensor using CoPd magnetic structures
(2018-10-29)
Liang, Jaw-Yeu
;
Chou, Yu-Jun
;
Yin, Chiao-Wen
;
Lin, Wen-Chin
;
Lin, Hong-Ji
We demonstrated the application of CoPd magnetic devices in single (H-2) and dual (H-2 and CO) gas detection by varying the thin-film structure. The anomalous Hall effect provided the read-out signal of the devices. The dual-gas sensor was particularly useful for examining whether methane reformation by steam was completed during H-2 production where CO is a byproduct. Through in situ Fourier transform infrared and X-ray absorption spectroscopy, we discovered that H-2 detection involved a charge-transfer effect between Co and Pd in addition to a surface-adsorption process, for both multilayer and alloy structures; however, CO detection was solely associated with a surface-adsorption process, which only occurred in the alloy structure. The proposed devices demonstrated performances exceeding those of current commercial models (solid-state based) regarding power consumption (<5 mW) because they were not required to undergo a heating process. An Arduino prototype platform was employed to test the modularization of the device, and adequate feasibility was demonstrated. Published by AIP Publishing.