Browsing by Author "Wu, HW"

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Chaos synchronization and chaos anticontrol of a suspended track with moving loads
(2004-03-05)
Ge, ZM
;
Wu, HW
;
機械工程學系
;
Department of Mechanical Engineering
In this paper, we first study the chaotic synchronization phenomenon of the suspended track with moving load system and then the transient response of chaos synchronization. The Lyapunov exponent is utilized to prove the chaos synchronization, but under certain conditions it is more complicated. Next, we study the synchronization of autonomous and non-autonomous systems. We find that slave systems cannot be synchronized with master system for certain time excitations no matter how large A is. Next, the phase synchronization between them will be studied. An application of chaos synchronization and secure communication is presented. Finally, in order to increase the chaos phenomena, we use anticontrol. Constant torque, periodic torque, periodic impulse signal, time delay function, and adaptive control are used successfully to control the state from order to chaos. (C) 2003 Elsevier Science Ltd. All rights reserved.
High performance InAs/GaAs quantum dot infrared photodetectors with AlGaAs current blocking layer
(2001-06-01)
Wang, SY
;
Lin, SD
;
Wu, HW
;
Lee, CP
;
電子工程學系及電子研究所
Low dark current InAs/GaAs quantum dot infrared photodetector (QDIP) is demonstrated. The dark current reduced for over three orders of magnitude by introducing a thin AlGaAs current blocking layer. This thin AlGaAs can reduce the dark current much more than the response signal. The responsivity at 0.5 V is 0.08 A/W with peak at 6.5 mum and the corresponding detectivity about 2.5 x 10(9) cm Hz(1/2/W1/2). It is the highest detectivity reported for QDIP at 77 K. (C) 2001 Published by Elsevier Science B.V.
Low dark current quantum-dot infrared photodetectors with an AlGaAs current blocking layer
(2001-02-19)
Wang, SY
;
Lin, SD
;
Wu, HW
;
Lee, CP
;
電子工程學系及電子研究所
Low dark current InAs/GaAs quantum-dot infrared photodetectors (QDIPs) are demonstrated. The dark current is reduced by over three orders of magnitude by using a thin AlGaAs current blocking layer. This thin AlGaAs layer reduces the dark current much more than the response signal. The responsivity at 0.5 V is 0.08 A/W with a peak detection wavelength at 6.5 mum. The corresponding detectivity is 2.5x10(9) cm Hz(1/2)/W-1/2, which is the highest detectivity reported for a QDIP at 77 K. (C) 2001 American Institute of Physics.