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Chinese Academy of Sciences Institutional Repositories Grid
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CAS IR Grid
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长春光学精密机械与... [14]
力学研究所 [4]
数学与系统科学研究院 [2]
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Parallel ensemble Kalman method with total variation regularization for large-scale field inversion
期刊论文
OAI收割
JOURNAL OF COMPUTATIONAL PHYSICS, 2024, 卷号: 509, 页码: 18
作者:
Zhang XL(张鑫磊)
;
Zhang L(张磊)
;
He GW(何国威)
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收藏
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浏览/下载:7/0
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提交时间:2024/07/04
Ensemble Kalman method
Parallel implementation
Field inversion
Data assimilation
Machine learning
Regularized HSS iteration methods for stabilized saddle-point problems
期刊论文
OAI收割
IMA JOURNAL OF NUMERICAL ANALYSIS, 2019, 卷号: 39, 期号: 4, 页码: 1888-1923
作者:
Bai, Zhong-Zhi
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收藏
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浏览/下载:74/0
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提交时间:2020/01/10
stabilized saddle-point problem
Hermitian and skew-Hermitian splitting
stationary iteration method
inexact implementation
preconditioning
convergence
Mode conversion and coupling in a slanted grating
期刊论文
OAI收割
opt. lett., 2014, 卷号: 39, 期号: 7, 页码: 1976
作者:
Li, Shubin
;
Zhou, Changhe
;
Cao, Hongchao
;
Wu, Jun
;
Yu, Junjie
收藏
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浏览/下载:33/0
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提交时间:2016/11/28
SURFACE-RELIEF GRATINGS
EFFICIENT IMPLEMENTATION
LAMELLAR GRATINGS
TM POLARIZATION
BINARY GRATINGS
WAVE METHOD
DIFFRACTION
DESIGN
OPTIMIZATION
FABRICATION
Mode conversion and coupling in a slanted grating
期刊论文
OAI收割
opt. lett., 2014, 卷号: 39, 期号: 7, 页码: 1976
作者:
Li, Shubin
;
Zhou, Changhe
;
Cao, Hongchao
;
Wu, Jun
收藏
|
浏览/下载:26/0
|
提交时间:2016/11/28
SURFACE-RELIEF GRATINGS
EFFICIENT IMPLEMENTATION
LAMELLAR GRATINGS
TM POLARIZATION
BINARY GRATINGS
WAVE METHOD
DIFFRACTION
DESIGN
OPTIMIZATION
FABRICATION
Reentry guidance based on parametric optimization (EI CONFERENCE)
会议论文
OAI收割
2012 International Conference on Mechatronics and Control Engineering, ICMCE 2012, November 29, 2012 - November 30, 2012, Guangzhou, China
作者:
Li D.
收藏
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浏览/下载:165/0
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提交时间:2013/03/25
This paper presents a parametric optimization approach to solve reentry guidance. Due to the various constraints imposed on the trajectory
original guidance problem can be converted into an optimal control problem with a merit function to be minimized. Direct implementation of method of variation and is too complex to get a reasonable result
while a numerical parametric optimization approach is feasible and efficient if we choose appropriate control variables as the optimization parameters and effective optimization algorithm. A simulation of the approach is performed to show its validity on reentry guidance problem: as the value of merit function converges to acceptable threshold
all constraints are hold. (2013) Trans Tech Publications
Switzerland.
E-CUSP scheme for the equations of ideal magnetohydrodynamics with high order WENO Scheme
期刊论文
OAI收割
JOURNAL OF COMPUTATIONAL PHYSICS, 2012, 卷号: 231, 期号: 19, 页码: 6233-6247
作者:
Shen YQ(申义庆)
;
Zha GC
;
Huerta MA
收藏
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浏览/下载:35/0
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提交时间:2013/01/18
Hypersonic
MHD
Shocks
Approximate Riemann Solver
Constrained Transport Method
Flux-Splitting Scheme
Upwind Scheme
Godunov Method
Efficient Implementation
Flows
Construction
Systems
A hybrid median filter for enhancing dim small point targets and its fast implementation (EI CONFERENCE)
会议论文
OAI收割
2011 International Conference on Multimedia and Signal Processing, CMSP 2011, May 14, 2011 - May 15, 2011, Guilin, Guangxi, China
Yang Q.
收藏
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浏览/下载:22/0
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提交时间:2013/03/25
Weak stars and middle altitude orbit satellites or high altitude orbit satellites are presented as dim point targets in images of astronomical observation. They have low intensity and occupy few pixels in image. In most situations
the background of sky is always ununiform and there exists pulse noises. Thus results in targets submerging in background noises and low signal noise ratio (SNR). Median filter is an effective method for removing pulse noise. But it can blur image after modifying gray of non-noise pixels when image has low SNR. A hybrid median filter algorithm is proposed to process low SNR dim point targets image. The newly proposed method can suppress the pulse noises
also can increase target $SNR$ and does not add extra fake targets. The time complexity of median filter is O(N2)(N is the widow size) and is difficult to implement in hardware. For quasi real time application
a fast implementation of our hybrid median filter is proposed to reduce the time complexity to O(N). Experimental results show that the newly proposed algorithm is superior to ordinary median filter and fast median filter by comparing visual effect and performance. 2011 IEEE.
Robust trajectory tracking control of autonomous quad-rotor UAV based on double loop frame (EI CONFERENCE)
会议论文
OAI收割
2011 International Conference on Materials, Mechatronics and Automation, ICMMA 2011, January 15, 2011 - January 16, 2011, Melbourne, VIC, Australia
作者:
Sun Q.
收藏
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浏览/下载:24/0
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提交时间:2013/03/25
This paper deals with the under-actuated characteristic of a quad-rotor unmanned aerial vehicle (UAV). By designing the double loop configuration
the autonomous trajectory tracking is realized. The model uncertainty
external disturbance and the senor noise are also taken into consideration. Then the H controller is put forward in the inner loop. An optimal stability augmentation control (SAC) method is used to stabilize the horizon position and keep it away from oscillation. By calculating the nonlinear decouple map
control quantity is converted to the speeds of the four rotors. At last some simulation results and the prototype implementation prove that the control method is effective.
MGRG-morphological gradient based 3D region growing algorithm for airway tree segmentation in image guided intervention therapy (EI CONFERENCE)
会议论文
OAI收割
2nd International Symposium on Bioelectronics and Bioinformatics, ISBB 2011, November 3, 2011 - November 5, 2011, Suzhou, China
作者:
Zhang T.
;
Gao X.
收藏
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浏览/下载:47/0
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提交时间:2013/03/25
Accurate surgical planning and guidance plays an important role in successful implementation of image guided intervention. In interventional lung cancer diagnosis and treatments
precise segmentation of airway trees from lung CT images provides crucial visualization for preoperative planning and intraoperative guidance to avoid major trachea injury. While 3D region growing can segment main the parts of an airway tree (trachea
left and right main bronchus
as well as bronchi)
the method fails at bronchiole segmentation and is not robust. Mathematical morphology is an anatomical detective. In this paper
we propose a morphological gradient based region growing (MGRG) algorithm to overcome the intensity inhomogeneity
and improve the robustness of 3D region growing on extraction of bronchioles. The MGRG algorithm is validated using lung CT images
and results show that it is able to segment bronchioles
and outperforms the traditional region growing method on airway tree segmentation. 2011 IEEE.
Design of transmission of high-speed CCD driving signals (EI CONFERENCE)
会议论文
OAI收割
2011 International Conference on Mechatronic Science, Electric Engineering and Computer, MEC 2011, August 19, 2011 - August 22, 2011, Jilin, China
作者:
Zhang S.
收藏
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浏览/下载:71/0
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提交时间:2013/03/25
In order to overcome the distortion problem of CCD driving signals caused by signal transmission
the detail implementation of transmission of high-speed CCD driving signals based on transmission line theory is discussed. The CCD driving signals are critical to the CCD to produce high quality images. In high speed application these drivers will occupy more circuit board areas and can not be put very close to the CCD. So the driving signals must be transmitted. Because the CCD exhibits capacitive load
the driving signals distortion problem is much severe. Transmission line theory is used to analyze the problem. The method of source termination is adopted to avoid signal reflections. Meanwhile the characteristic impedance of the circuit board and the resistance of terminal resistor are designed small enough to decrease the rising and falling time of the driving signals. Experimental results show that there is no distortion of the high speed driving signals after transmission. 2011 IEEE.
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