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Based on analysis of sources of the noise of switched reluctance motor (SRM), the paper puts forward methods to reduce noise in terms of torque ripple and phase change from the point of control view. In the low speed stage, phase current closed-loop segmented according to the sine and cosine curve, maintain a constant torque to reduce the torque ripple. Put forward soft turn-off method at the time...
We investigate the problem of person search in the wild in this work. Instead of comparing the query against all candidate regions generated in a query-blind manner, we propose to recursively shrink the search area from the whole image till achieving precise localization of the target person, by fully exploiting information from the query and contextual cues in every recursive search step. We develop...
This paper first analyzes the mechanism of vibration noise and torque ripple of the switched reluctance motor, and then studies methods of reducing torque ripple and noise reduction according to the principle. In order to reduce the noise, two-step phase conduction is proposed when motor starts. Meanwhile, each phase of the shutoff in advance will be replaced by reducing duty ratio slowly. In order...
To enhance the mask rejection below 2 MHz for effective human body communication (HBC), a new mask shaping technique is proposed for the HBC transmitter, where a digital sigma-delta modulated infinite impulse response (IIR) filter provides sufficient rejection with a digital-to-analog converter (DAC) of only 8 bits. A receiver with high input impedance is designed to improve the sensitivity, and a...
There exist some problems in the fiber optic gyro inertial measurement unit(FOG-IMU) calibration, such as dependence on high-precision turntable, low precision, rigorous calibration condition and so on. Aiming at these problems, we propose a high-precision grading calibration method. Firstly, system parameters are calibrated by the discrete calibration method, in which the effects of the lever-arm...
Aming at solving the boiler steam flow prediction problem in power plants, a predictive method based on least squares support vector machine is presented. A particle swarm optimization algorithm is utilized to optimize the model accuracy. The experimental results based on practical data shows that the predictive model based on least squares support vector machine can effectively predict the main steam...
A method of blind signal separation based on second order statistic analytic equations is provided for a single sensor. This method takes second order statistics equations as restrictive conditions to construct blind separation criterion, then traditional blind separation methods are used to separate source signals through iterative optimization of genetic algorithm. In theory, not only can the coherent...
Magnetic resonance fingerprinting (MRF) is a new quantitative imaging paradigm that enables simultaneous acquisition of multiple magnetic resonance tissue parameters (e.g., T1, T2, and spin density). Recently, MRF has been integrated with simultaneous multislice (SMS) acquisitions to enable volumetric imaging with faster scan time. In this paper, we present a new image reconstruction method based...
A class of discrete-time networked switched control systems are investigated with event-triggered control. The closed-loop system is formulated as switched linear systems with time-varying delays, based on which the exponential stability conditions are obtained under the time delay system framework. The co-design conditions of the control gain and the triggering parameters are proposed. Finally, a...
This paper tackles the optimal tracking control problem for reconfigurable manipulators based on critic-only policy iteration (CoPI) algorithm. By system transformation, the optimal tracking control problem is transformed into an optimal regulation problem. The optimal tracking controller is composed of the desired controller and the approximate optimal feedback one. The desired controller is developed...
We introduce a new fashion search protocol where attribute manipulation is allowed within the interaction between users and search engines, e.g. manipulating the color attribute of the clothing from red to blue. It is particularly useful for image-based search when the query image cannot perfectly match users expectation of the desired product. To build such a search engine, we propose a novel memory-augmented...
A national continuous project "Science and Technology Collage Campus for Adolescents (STCCA)" was started in 2012 by China Association of Science and Technology (CAST) and Ministry of Education (MOE). Top universities, institutes and companies cooperate with CAST on planning and implementation of the project every year. This research evaluated the process and effect of STCCA in 2016. Online...
Conventional phase-contrast (PC) MRI relies on electrocardiogram (ECG)-synchronized cine acquisition and respiration control. It often results in relatively low data acquisition efficiency, and is unable to assess blood flow variabilities. Real-time imaging is a promising technique to overcome these limitations; however, it results in a challenging image reconstruction problem with highly-undersampled...
This paper investigates decentralized tracking control (DTC) problem for unknown large-scale systems via adaptive dynamic programming. The DTC consists of local desired control and local tracking error control. By replacing the actual states of coupled subsystems in interconnection terms with their desired states, the norm-boundedness assumption can be removed. Based on local neural network (NN) observers,...
The circular Escherichia coli chromosome has been suggested to form a partition of the genome where it folds into a collection of sequentially consecutive domains. This paper presents a prediction method to give the location of the folding boundaries. Because genes involved in one domain tend to be co-expressed, the information of activation and co-expression level is extracted from multi-source data...
We have successfully demonstrated a smart UV patch to memorize the accumulative energy from the exposure to UV light over a period of time. The sensing principle is based on changes in the electrical resistance of a composite made of photo-acid generator triphenyl sulfonium triflate (TST), poly aniline emeraldine (PANI-EB), polyethylene glycol (PEG) and carbon nanotubes (CNTs). The sheet resistance...
The next few years promises drastic improvements to global navigation satellite systems. USA is modernizing GPS, Russia is GLONASS, Europe is moving ahead with its own Galileo System, and China is expanding its BeiDou system from a regional navigation system to a full constellation global navigation satellite system known as BeiDou-2/Compass. Chinese BeiDou satellite navigation system constellation...
Taking a multi-joint robotic arm for example, the flexibility of links and joints are considered. The dynamic characteristics of the flexible robotic arm are studied based on finite element method and experimental modal analysis. The analysis results are compared. First, pre-stressed modal analysis of the flexcible robotic arm are carried out applying software ANSYS Workbench. The natural frequencies...
In order to meet the requirement of high-compact and hard-real-time outdoor navigation system, to solve the problem of invalid satellite navigation during GPS-denied period, a multi-sensors integrated navigation system is designed in this study. The system is fused with accelerometer, gyroscope, satellite receiver, binocular vision camera and barometer. The Kalman Filter, which is designed for model...
The next few years promises drastic improvements to global navigation satellite systems. The USA is modernizing GPS, Russia is GLONASS, Europe is moving ahead with its own Galileo System, and China is expanding its BeiDou-1 system from a regional navigation system to a full constellation global navigation satellite system known as BeiDou-2/Compass. Chinese BeiDou satellite navigation system constellation...
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