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Sliding Mode Control for an Intelligent Landing Gear Equipped with Magnetorheological Damper
Luong Quoc Viet,이효상,장대성,황재혁 항공우주시스템공학회 2020 항공우주시스템공학회지 Vol.14 No.2
Several uncertainties in the landing environment of an aircraft are not considered, such as the falling speed, ambient temperature, and sensor noise. These uncertainties negatively affect the performance of the controller applied to a landing gear. The sliding mode control (SMC) method, which maintains the optimal performance of a controller under uncertainties, is used in this study. The landing gear is equipped with a magnetorheological damper that changes the yield shear stress according to the applied magnetic field. The applied controller employs a hybrid control combining Skyhook control and force control. The SMC maintains the optimal performance of the hybrid control by minimizing the tracking error of the damper force, even in various landing environments where parameter uncertainties are applied. The effect of SMC is verified through co-simulation results from Simscape and Simulink.
Ownership Structure and Dividend Policy of Vietnamese Enterprises after the Global Financial Crisis
Pham,Quoc Viet,Luong,Quoc Trong Vinh,Tran,Bao Vy 한국유통과학회 2019 KODISA ICBE (International Conference on Business Vol.2019 No.-
The paper examines the impact of ownership structure on the dividend policy of listed companies in the Vietnam stock market after the global financial crisis. The sample uses panel data including 91 corporates listed on the Ho Chi Minh City Stock Exchange (HOSE) for 2009-2015. The results of the study show that public ownership and domestic private ownership are positive correlated with dividend payout ratio, while the effect of foreign ownership on dividend policy is not significant. This result could provide an important implication on the orientation of restructuring state-owned enterprises and attracting foreign investment in Vietnam stock market in the future.
Fill factor controlled nanoimprinted ZnO nanowires based on atomic layer deposition
Surabhi, Srivathsava,Luong, Chi Hieu,Kim, Min Yi,Van, Phuoc Cao,Quoc, Viet Dong,Kuchi, Rambabu,Lee, Jae-Woong,Chang, Hyo-Sik,Jeong, Jong-Ryul ELSEVIER 2018 Current Applied Physics Vol.18 No.6
<P><B>Abstract</B></P> <P>Enhanced diffraction by sub-wavelength nanostructures to convert incident electromagnetic radiation into waveguide modes has applications in anti-reflective coatings for optoelectronic devices. We propose a metal oxide (ZnO) nanowire grid polarizer as such a nanostructure, fabricated by ultraviolet nanoimprint lithography and whose fill factor (FF) is controlled by atomic layer deposition. Using finite difference time domain simulations, we investigated the polarization-dependent optical transmittance of the structures and calculated the polarizing efficiency. Optical profiles such as electric and magnetic field intensity and current density distributions of specific FF nanopatterns were determined for the transverse magnetic and transverse electric modes. The effects of geometrical parameters including the wire-grid period, fill ratio, and spacing between the wire-grid layers on diffraction wavelength were characterized. Respective FF-controlled ZnO nanowire structures were fabricated and their experimental optical transmittances were measured for nanowire grid polarizer applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Fill factor (FF) controlled ZnO nanowires (NW) through atomic layer deposition (ALD), combined with UV-NIL were prepared. </LI> <LI> Polarizing efficiency of NWs has increased with ALD thickness at which stronger diffraction wavelengths are observed. </LI> <LI> ALD enables us to control the fill factor precisely in nanowire grid polarizer. </LI> <LI> Simulation results supported by experiments confirm that the proposed FF controlled ZnO NWs can be efficient polarizers. </LI> </UL> </P>