中国科学院机构知识库网格系统: 检索

The plasticity of intrinsic functional connectivity patterns associated with rehabilitation intervention in chronic stroke patients 期刊论文 OAI收割
NEURORADIOLOGY, 2016, 卷号: 58, 期号: 4, 页码: 417-427
作者: Zheng, XH; Sun, LM; Yin, DZ; Jia, J; Zhao, ZY

收藏 | 浏览/下载：17/0 | 提交时间：2016/09/14

MOTOR RECOVERY SUBCORTICAL STROKE LONGITUDINAL FMRI ACTIVATION BALANCE HEMIPARETIC STROKE REORGANIZATION NETWORK MRI PERFORMANCE CORTEX

Micronutrient deficiencies and developmental delays among infants: evidence from a cross-sectional survey in rural China SCI/SSCI论文 OAI收割
2015
作者: Luo R. F.; Shi, Y. J.; Zhou, H.; Yue, A.; Zhang, L. X.

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收藏 | 浏览/下载：126/0 | 提交时间：2017/11/09

nutrition & dietetics public health randomized-controlled-trials 1st 5 years iron-deficiency mental-development motor development test-scores predictive-validity child-development test-performance western china

Linear auto disturbance rejection controller for vector-controlled PMSM drive system (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Transportation, Mechanical, and Electrical Engineering, TMEE 2011, December 16, 2011 - December 18, 2011, Changchun, China
作者: Zhang K.; Zhang K.; Zhang K.; Zhang K.

收藏 | 浏览/下载：36/0 | 提交时间：2013/03/25

A high-performance robust controller of permanent-magnet synchronous motor (PMSM) drive with cascade linear auto disturbance rejection controller (LADRC) is proposed. The robust controller combines the simplicity of linear controller and the merit of the auto disturbance rejection controller (ADRC). First a systematic mathematical model is derived according to the required specifications for the PMSM drive system. Then for the model this paper designs the controller that includes three first-order LADRCs. The controller does not rely on the accurate mathematical model of motor. The controller can estimate and compensate the disturbances that include load disturbance and systematic parameters changes by the linear extended state observer (LESO). Simulation results show that compared with conventional PI controller the proposed approach has strong robustness. In the same load disturbance the speed fluctuation of the LADRCs accounts for 30% of PI controller. 2011 IEEE.

The application of the discrete sliding mode control based on state observer in aerial camera (EI CONFERENCE) 会议论文 OAI收割
2nd Annual Conference on Electrical and Control Engineering, ICECE 2011, September 16, 2011 - September 18, 2011, Yichang, China
作者: Zhang X.; Zhang X.; Zhang X.

收藏 | 浏览/下载：17/0 | 提交时间：2013/03/25

A discrete sliding mode control scheme based on state observer is designed for DC torque motor. Aim on the problem of control chattering and steady-state chattering caused by discrete sliding mode control method adaptive reaching law is proposed Non-chattering and stability are made an analysis. The aerial camera is chosen as an experimental platform and the discrete sliding mode controller with adaptive reaching law is applied to the drawtube system the value of acceleration can be observed on line. The experiment results show the control scheme can effectively eliminate chattering and also make the drawtube system achieve better dynamical performance. 2011 IEEE.

High precision test method for dynamic imaging of space camera (EI CONFERENCE) 会议论文 OAI收割
2010 IEEE International Conference on Advanced Computer Control, ICACC 2010, March 27, 2010 - March 29, 2010, 445 Hoes Lane - P.O.Box 1331, Piscataway, NJ 08855-1331, United States
作者: Jin L.-X.; Zhang K.; Zhang K.; Zhang K.; Zhang K.

收藏 | 浏览/下载：29/0 | 提交时间：2013/03/25

A test method for dynamic imaging of space TDICCD (Time Delay and Integration Charge Coupled Devices) camera was presented in this paper. The test method adopted the PLL (Phase Locked Loop) technology and CMAC (Cerebella Model Articulation Controller) friction compensation as control strategy. Furthermore According to this method a test system for dynamic imaging of space TDICCD camera was designed and implemented. The system simulated the movement of the ground objects relative to the space aerocraft to validate the capability of image speed match and the dynamic imaging quality of TDICCD camera. The design adopted a precision turntable and a drift turntable to simulate the movement around the earth and the drift motion in different latitude due to the rotation of earth of the aerocraft. The turntables were drived by permanent magnet torque motor which was powered by PWM (Pulse Width Modulation). The system adopted DSP (Digital Signal Processor) as the control core and reached a very high performance. The experimental results showed that the steady speed error was better than 0.01 % and the instantaneous speed error reached 0.0267%. The precision of the test system designed met the requirement for dynamic imaging of TDICCD camera. 2010 IEEE.

A design on a control method of a new type of focal plane shutter (EI CONFERENCE) 会议论文 OAI收割
2010 International Conference on Computer, Mechatronics, Control and Electronic Engineering, CMCE 2010, August 24, 2010 - August 26, 2010, Changchun, China
Xue L.; Ming L.; Zheng L.-N.; Zhou J.-F.; Zhang H.-W.; Zhang J.-C.

收藏 | 浏览/下载：33/0 | 提交时间：2013/03/25

In order to ensure appropriate exposure time and no exposure while electric charge is transferring after taking a photograph it is necessary to have the shutter mechanism cooperate with CCD for area CCD aerial cameras. The ground object illumination has a wide range which is from 4000Lx to 100000Lx so a shutter which is high efficient and a continuous stepless adjustment are also required. This paper introduces the fundamental principle structural design and control procedure about this new focal plane shutter. Under the control of DSP the velocity of shutter curtain governed by the shutter motor can be not only precisely controlled but also the durability and the reliability are increased. The experiment results have shown that this new shutter has the higher stability of movement long life span with more than 105 operating times a wide range of exposure time from1/ 50s to 1/ 320s(depending on the slit width)and the exposure error is less than 10%. With the CCD gain adjustment the performance of this shutter is fully satisfied with the requirements of area CCD aerial cameras. 2010 IEEE.

An effective algorithm for hierarchical network topology connectivity check 会议论文 OAI收割
2nd International Conference on Information Science and Engineering, ICISE2010 - Proceedings, Hangzhou, China, December 4, 2010 - December 6, 2010
Wang Shaohua; Zhong Ershun; Ma Haibo; Li Kai; Zhang Xiaohu; Zheng Huaihai

收藏 | 浏览/下载：33/0 | 提交时间：2012/09/01

Algorithms Electric network topology Information science Road network Time complexity Topological networks Motor transportation Connectivity Effective algorithms Excellent performance Heuristic search Hierarchical network Large graphs Path-planning

Estimation of psychomotor delay from the Fitts' law coefficients 期刊论文 OAI收割
BIOLOGICAL CYBERNETICS, 2009, 卷号: 101, 期号: 4, 页码: 279-296
作者: Beamish, Dan; Bhatti, Shabana; Chubbs, C. Scott; MacKenzie, I. Scott; Wu, Jianhong

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收藏 | 浏览/下载：12/0 | 提交时间：2018/07/30

Fitts' law Psychomotor delay Motor performance Motor control Neurodynamics

Disc varifocal mechanism to improve efficiency of scene matching navigation system (EI CONFERENCE) 会议论文 OAI收割
2009 2nd International Conference on Future Information Technology and Management Engineering, FITME 2009, December 13, 2009 - December 14, 2009, Sanya, China
作者: Zhang C.-L.

收藏 | 浏览/下载：20/0 | 提交时间：2013/03/25

In order to meet special requests of optical imaging sensor in scene matching navigation system a disc varifocal mechanism is proposed for the flight vehicles of long flying time and range. Within small space occupied it can obtain real images with various resolutions. Moreover using plate traveling-wave Ultrasonic Motor as its driven motor can reduce energy loss improve control precision and ensure image obtaining being real-time and stable. Disc varifocal mechanism driven by plate traveling-wave Ultrasonic Motor is high-response and variation in load doesn't affect its performance parameter. Therefore applying disc varifocal mechanism in scene matching navigation system combing software and hardware can obviously improve the accuracy real-time and robust of scene matching navigation system. The experiment showed that when the weight of mechanism was 1.5kg the shortest starting was 0.6ms and the shortest shutoff was 0.5ms. 2009 IEEE.

Performance limitations from delay in human and mechanical motor control 期刊论文 OAI收割
BIOLOGICAL CYBERNETICS, 2008, 卷号: 99, 期号: 1, 页码: 43-61
作者: Beamish, Dan; Bhatti, Shabana; Wu, Jianhong; Jing, Zhujun

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收藏 | 浏览/下载：21/0 | 提交时间：2018/07/30

Fitts' law psychomotor delay motor performance motor control neurodynamics