Shenzhen, China

Shenzhen Institute of Information Technology is a university located in Shenzhen, Guangdong, China. Its current president is Zhang Jihong. Wikipedia.

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Li S.,Stevens Institute of Technology | Chen S.,Shenzhen Institute of Information Technology | Liu B.,University of Massachusetts Amherst
Neural Processing Letters | Year: 2013

Bartels-Stewart algorithm is an effective and widely used method with an O(n 3) time complexity for solving a static Sylvester equation. When applied to time-varying Sylvester equation, the computation burden increases intensively with the decrease of sampling period and cannot satisfy continuous realtime calculation requirements. Gradient-based recurrent neural network are able to solve the time-varying Sylvester equation in real time but there always exists an estimation error. In contrast, the recently proposed Zhang neural network has been proven to converge to the solution of the Sylvester equation ideally when time goes to infinity. However, this neural network with the suggested activation functions never converges to the desired value in finite time, which may limit its applications in realtime processing. To tackle this problem, a sign-bi-power activation function is proposed in this paper to accelerate Zhang neural network to finite-time convergence. The global convergence and finite-time convergence property are proven in theory. The upper bound of the convergence time is derived analytically. Simulations are performed to evaluate the performance of the neural network with the proposed activation function. In addition, the proposed strategy is applied to online calculating the pseudo-inverse of a matrix and nonlinear control of an inverted pendulum system. Both theoretical analysis and numerical simulations validate the effectiveness of proposed activation function. © 2012 Springer Science+Business Media, LLC.

Yu B.L.,Shenzhen Institute of Information Technology
Advanced Materials Research | Year: 2014

In this paper, an elevator safety gear wedge with surface metal-ceramic composite coatings is proposed. After composite coating, the friction performance of the elevator safety gear wedge is very stable at high temperature, because of high hardness and high temperature oxidation resistance of coating material. And the friction coefficient becomes small by coating ceramic. In this research, six samples with different coating are prepared. These samples are installed in elevator safety system, and related speed parameters and stopping distance of elevator are tested. A conclusion can be drawn that sample 4 with 45# steel substrate and NiCrBSi-60 coating has a suitable friction coefficient, and the deceleration of elevator is controlled in the range of 0.2 to 1.0g when sample is installed in safety gear system. © (2014) Trans Tech Publications, Switzerland.

Li H.Z.,Shenzhen Institute of Information Technology
Applied Mechanics and Materials | Year: 2014

Aiming at the attitude interference of space mechanical arm of free-flying space robot (FFSR) against the satellite body, parallel coordination motion control technology for space mechanical arm and satellite body is proposed in this paper. Firstly, the position and velocity at any point based on FFSR system can be expressed as a set of functions consisting of chain pole centroid vectors, and the kinematic model for FFSR has been set up. Secondly, the compact form of dynamical model in system centroid vector function for FFSR is set up with Lagrange method. Finally, inherent redundancy characteristic of FFSR system is applied to propose the parallel coordination motion control technology which simultaneously and effectively controls the motions of F satellite body and configuration of space mechanical arm. Transposition Jacobi controller with inertia feedback has been developed. © (2014) Trans Tech Publications, Switzerland.

He J.,Aberystwyth University | Lin G.,Shenzhen Institute of Information Technology
IEEE Transactions on Evolutionary Computation | Year: 2016

In evolutionary optimization, it is important to understand how fast evolutionary algorithms converge to the optimum per generation, or their convergence rates. This letter proposes a new measure of the convergence rate, called the average convergence rate. It is a normalized geometric mean of the reduction ratio of the fitneb difference per generation. The calculation of the average convergence rate is very simple and it is applicable for most evolutionary algorithms on both continuous and discrete optimization. A theoretical study of the average convergence rate is conducted for discrete optimization. Lower bounds on the average convergence rate are derived. The limit of the average convergence rate is analyzed and then the asymptotic average convergence rate is proposed. © 2015 IEEE.

Mu X.,Shenzhen Institute of Information Technology
2010 Chinese Control and Decision Conference, CCDC 2010 | Year: 2010

A fuzzy neural sliding mode controller based on genetic algorithm (FNSMCGA) is presented for trajectory tracking control of multi-link robots with model errors and uncertain disturbances. This approach gives a new global sliding mode manifold for multi-link robots, which enable system trajectory to run on the sliding mode manifold at the start point and eliminate the reaching phase of the conventional sliding mode control. Robustness for system dynamics is guaranteed over all the response time. A fuzzy neural network (FNN) is employed to eliminate chattering of global sliding mode control, and enforce the sliding mode motion by FNN learning the upper bound of model errors and uncertain disturbances. Genetic algorithm can optimize the FNN initial parameters, which can make the robot running with expected trajectory in whole running process. The control laws are calculated by Lyapunov stability method, which ensure that the controlled system is stable. Simulation results verify the validity of the control scheme. ©2010 IEEE.

Zhan S.,Shenzhen Institute of Information Technology | Huo H.,Shenzhen Institute of Information Technology
Journal of Information and Computational Science | Year: 2012

Job scheduling system problem is a core and challenging issue in cloud computing. How to use cloud computing resources efficiently and gain the maximum profits with job scheduling system is one of the cloud computing service providers' ultimate goals. For characteristics of particle swarm optimization algorithm in solving the large-scale combination optimization problem easy to fall into the search speed slowly and partially the most superior, the global fast convergence of simulated annealing algorithm is utilized to combine particle swarm optimization algorithm in each iteration, which enhances the convergence rate and improves the efficiency. This paper proposed the improve particle swarm optimization algorithm in resources scheduling strategy of the cloud computing. Through experiments, the results show that this method can reduce the task average running time, and raises the rate availability of resources. 1548-7741/Copyright © 2012 Binary Information Press.

Huo H.,Shenzhen Institute of Information Technology | Zhan S.,Shenzhen Institute of Information Technology
International Journal of Digital Content Technology and its Applications | Year: 2012

Although the grey forecasting model has been successfully utilized in many fields and demonstrated promising results, there are some problems in GM(1,1) model, such as, model method biased, transformation inconsistent and first number of the initial sequence not functioning high precision prediction in model after an accumulated generating operation. Literatures show its performance still could be improved. For this purpose, this paper proposes an improved grey GM(1,1) model, which uses Fourier series to correct the residual of original value and predictive vale, and reconstructs the GM(1,1) white background value based on genetic algorithm. As shown in simulation results, the proposed model obviously can improve the prediction accuracy of the original grey model, and has a very high practicability and reliability.

Chen Y.-Q.,Shenzhen Institute of Information Technology
International Journal of Theoretical Physics | Year: 2013

One-parameter general coherent state of the gl(2,1) superalgebra is constructed. Its properties are discussed in detail. One-parameter matrix elements of the gl(2,1) generators in the one-parameter general coherent-state space are calculated. © 2012 Springer Science+Business Media New York.

Sun Y.,Shenzhen Institute of Information Technology
Yadian Yu Shengguang/Piezoelectrics and Acoustooptics | Year: 2016

This paper presents a new type metal-piezoelectric composite tube actuator to meet the requirements of micro vibration control and vibration isolation system for the shift, driving force and other performance requirements of piezoelectric actuator. The tubular piezoelectric actuators are bonded to a metal tube, when the piezoelectric tube is subjected to the external excitation voltage effect, it will produce the expansion strain in the axial direction, so that the metal tube in the axial direction will produce displacement and driving force. Firstly, the static actuation performance of the metal-piezoelectric actuator is analyzed, the results show that the metal-piezoelectric actuator has moderate displacement and driving force; at the same time, using the finite element method to validate the above result. For a certain metal-piezoelectric composite pipe, the strain obtained by theoretical calculation formula is 0.912×10-5, and the strain obtained by the finite element method is 0.925×10-5. It proves the effectiveness and correctness of the theoretical calculation formula; Finally, the design and fabrication of a copper piezoelectric composite actuator is carried out. © 2016, Sichuan Institute of Piezoelectric and Acoustooptic Technology. All right reserved.

Shenzhen Institute of Information Technology | Date: 2014-06-04

The invention provides a method and device of extracting a sound source acoustic image body in 3D space. The method includes: determining a spatial position of a sound source acoustic image and determining a speaker beside the spatial position where the sound source acoustic image is located according to the determined spatial position (, , ) of the sound source acoustic image; calculating a correlation of signals of all sound tracks of the selected speaker in the horizontal direction and the vertical direction, and obtaining and storing a parameter set {IC_(H), IC_(v), Min{IC_(H), IC_(v)}} of a acoustic image body, wherein the Min{IC_(H), IC_(v)} is a smaller value between IC_(H )and IC_(v). The expression parameters of the acoustic image body obtained in the present invention are used for providing technical support for accurately restoring the size of the sound source acoustic image in a 3D audio live system, which solves the technical problem that the restored acoustic image in a 3D audio is excessively narrow at present.

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