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RISS 인기검색어
- 검색키워드
- 저자 : Weihai Chen (검색결과 3 건)
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Stimuli-Induced Equilibrium Point: A Psychological Field Theory Application in Ramp Merging Systems
Kendrick Amezquita S.,Peter C. Y. Chen,Weihai Chen,Zheng Zhao 제어로봇시스템학회 2017 제어로봇시스템학회 국제학술대회 논문집 Vol.2017 No.10
Based on the psychological field theory, the stimuli-induced equilibrium point (SIEP) model is formulated to characterize the interaction of a driver between two vehicles (leader and follower) in a three-vehicle platooning configuration. Considering the intensity of the stimuli that act upon a driver between these vehicles, the point at which the stimuli resultant becomes zero (i.e. the equilibrium point) is obtained. Consequently, the location of such a point within the leader-follower gap changes continuously according to the speed of the middle vehicle and the current traffic scenario. This methodology enables the systematic computation of speed and position references for automatic ramp merging systems. Such stimuli-induced equilibrium point has shown to improve the performance of existing merging control schemes while increasing safety conditions by providing enough reaction time for drivers to avoid and eventual collision.
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Mixed H2/H∞ Control for Linear Infinite-Dimensional Systems
Kai-Ning Wu,Baozhu Guo,Weihai Zhang,Bor-Sen Chen 제어·로봇·시스템학회 2016 International Journal of Control, Automation, and Vol.14 No.1
In this paper, we consider mixed H2=H∞ control problems for linear infinite-dimensional systems. Thefirst part considers the state feedback control for the H2=H∞ control problems of linear infinite-dimensional systems. The cost horizon can be infinite or finite time. The solutions of the H2=H∞ control problem for linear infinitedimensionalsystems are presented in terms of the solutions of the coupled operator Riccati equations and coupleddifferential operator Riccati equations. The second part addresses the observer-based H2=H∞ control of linearinfinite-dimensional systems with infinite horizon and finite horizon costs. The solutions for the observer-basedH2=H∞ control problem of linear infinite-dimensional systems are represented in terms of the solutions of coupledoperator Riccati equations. The first-order partial differential system examples are presented for illustration. Inparticular, for these examples, the Riccati equations are represented in terms of the coefficients of first-order partialdifferential systems.
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Metal Adsorbate-Induced Plasmon Damping in Gold Nanorods: The Difference Between Metals
Pengyu Xu,Xuxing Lu,Junwei Zhao,Yue Li,Sheng Chen,Junfei Xue,Weihui Ou,Song Han,YAPING DING,Weihai Ni 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.9
We presented a single particle study on the metal adsorbate-induced plasmon damping in Au nanorods (AuNRs) through adsorbing clusters of different metals including Pt, Au and Ag. AuNRs with different longitudinal surface plasmon resonance (LSPR) wavelength were measured and investigated individually. Linewidth broadening, plasmon shift and reduction of plasmonic resonance of single AuNRs were studied and compared between Pt, Au and Ag adsorbates. The measured linewidths perfectly match the theoretical predictions of the billiard model with increased scattering coefficients resulted from the metal adsorbates. The results indicate that the plasmon damping in case of Ag is significantly weaker than Pt and Au, which can be attributed to longer relaxation time of free electrons in Ag and therefore less loss of the oscillating plasmon electrons. In contrast to the red shift observed from Au and Pt, blue shift of the LSPR is observed in case of Ag. It suggests that plasmonic properties brought by the metal adsorbates can exert dramatic influence on the nanoparticle that is adsorbed with. We believe that our study not only provides important understanding on plasmon damping but pave the road for the fabrication of complex nanostructures with two or more metal elements.
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