Search

Your search keyword '"Li, Dequan"' showing total 505 results
Start Over Author "Li, Dequan"
505 results on '"Li, Dequan"'

22. Piston Error Automatic Correction for Segmented Mirrors via Deep Reinforcement Learning.

Author

Li, Dequan, Wang, Dong, and Yan, Dejie

Subjects
*DEEP reinforcement learning, *MACHINE learning, *SUPERVISED learning, *OPTICAL transfer function, *TRANSFER functions, *REINFORCEMENT learning
Abstract

The segmented mirror co-phase error identification technique based on supervised learning methods has the advantages of simple application conditions, no dependence on custom sensors, a fast calculation speed, and low computing power requirements compared with other methods. However, it is often difficult to obtain a high accuracy in practical application situations with this method because of the difference between the training model and the actual model. The reinforcement learning algorithm does not need to model the real system when operating the system. However, it still retains the advantages of supervised learning. Thus, in this paper, we placed a mask on the pupil plane of the segmented telescope optical system. Moreover, based on the wide spectrum, point spread function, and modulation transfer function of the optical system and deep reinforcement learning—without modeling the optical system—a large-range and high-precision piston error automatic co-phase method with multiple-submirror parallelization was proposed. Finally, we carried out relevant simulation experiments, and the results indicate that the method is effective. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

33. Theoretical and Experimental Adsorption Studies of Polyelectrolytes on an Oppositely Charged Surface

Author

Mashl, R. Jay, Grønbech-Jensen, Niels, Fitzsimmons, M. R., Lütt, M., and Li, DeQuan

Subjects
Condensed Matter - Soft Condensed Matter, Condensed Matter - Materials Science
Abstract

Using self-assembly techniques, x-ray reflectivity measurements, and computer simulations, we study the effective interaction between charged polymer rods and surfaces. Long-time Brownian dynamics simulations are used to measure the effective adhesion force acting on the rods in a model consisting of a planar array of uniformly positively charged, stiff rods and a negatively charged planar substrate in the presence of explicit monovalent counterions and added monovalent salt ions in a continuous, isotropic dielectric medium. This electrostatic model predicts an attractive polymer-surface adhesion force that is weakly dependent on the bulk salt concentration and that shows fair agreement with a Debye-Huckel approximation for the macroion interaction at salt concentrations near 0.1 M. Complementary x-ray reflectivity experiments on poly(diallyldimethyl ammonium) chloride (PDDA) monolayer films on the native oxide of silicon show that monolayer structure, electron density, and surface roughness are likewise independent of the bulk ionic strength of the solution., Comment: Revtex, prb format; uses amssymb

Published
1999
Full Text
View/download PDF

50. Detecting the Deviations of Privileged Process Execution

Author

Su, Purui, Li, Dequan, Qu, Haipeng, Feng, Dengguo, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Lorenz, Pascal, editor, and Dini, Petre, editor

Published
2005
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results