Search Results - Ge Ren
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Ex-military strategic leaders and corporate social performance: effects and boundaries
Published 2025-09-01Get full textExmilitary strategic leaders, by whether and when they affect corporate social performance (CSP), have not been systematically explored to date. On the basis of imprinting theory, upper echelons theory, and empirical data from Chinese listed firms from 2011 to 2020, we obtain the following findings:...
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Piston Sensing for Sparse Aperture Systems via All-Optical Diffractive Neural Network
Published 2024-01-01Get full textIt is a crucial issue to realize real-time piston correction in the area of sparse aperture imaging. This paper demonstrates that an optical diffractive neural network is capable of achieving light-speed piston sensing. By using detectable intensity distributions to represent pistons, the proposed m...
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Enhanced Disturbance Observer Based on Acceleration Measurement for Fast Steering Mirror Systems
Published 2017-01-01Get full textIn this paper, a modified disturbance observer (DOB) for fast steering mirror (FSM) optical system based on a charge-coupled device (CCD) and inertial sensors is proposed. Combining a DOB with the classical cascaded multiloop feedback control, including position loop, velocity loop, and acceleration...
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Momentum-Accelerated Incoherent Fourier Ptychographic Photography
Published 2020-01-01Get full textIncoherent Fourier Ptychography (IFP) is a super-resolution imaging method, which requires lots of iteration time to recover the high-resolution object image from raw images. To improve the convergence rate of the IFP, we propose an improved algorithm, termed momentum-accelerated Incoherent Fourier...
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Misalignment Calculation on Off-Axis Telescope System via Fully Connected Neural Network
Published 2020-01-01Get full textOn the process of alignment for pupil off-axis telescope system, the determination of decentering and tilt misalignments is a key step. In this paper, we proposed a new method which adopts the fully connected neural network (FCNN) as a fitting tool to establish the nonlinear mapping relation between...
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Experimental Study of a Multispectral Piston Sensing Technology
Published 2019-01-01Get full textNowadays giant segmented telescopes and multiaperture telescopes have grown out of the quest for high-resolution observations in astronomy. One of the major issues is the phasing of such telescopes. A concept of multispectral piston sensing technology is, therefore, re-examined and studied experimen...
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Restoration of Degraded Images Using Pupil-Size Diversity Technology With Stochastic Parallel Gradient Descent Algorithm
Published 2016-01-01Get full textThe performance of imaging systems is inevitably degraded by aberrations of optical systems. Furthermore, images detected by long-distance imaging schemes also suffer blurring induced by atmospheric turbulence. To address this problem, we propose and demonstrate an aberration-free imaging procedure...
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Restoration of Sparse Aperture Images Using Spatial Modulation Diversity Technology Based on a Binocular Telescope Testbed
Published 2017-01-01Get full textIn this paper, our recently developed spatial modulation diversity technology (SMDT) is first used to correct the blurring and restore the lost midband contrast of synthetic images based upon an actual sparsely filled aperture system, specifically a binocular telescope testbed consisting of two hori...
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