Earticle

As to the embedded system of multi-tasks, this paper proposes a hardware/software partitioning algorithm based on Clustering algorithm using reference and density and Genetic algorithm. The algorithm uses reference task to reflect attribute of system task node, and firstly finish classification of task nodes to decrease the scale of the system, and then partitions hardware/software based on genetic algorithm. The experiments results have showed that this algorithm can accelerate converge to appropriate solution of complex system with more tasks.

Robots are imitation for the present generation human beings. There is huge change in between robot and human beings where differentiated by their mind, intellectual capabilities. Generally Manipulator is an important parameter in robots construction and flexible operation, nothing but robotic arm. In this paper, we proposed a specially designed Controller for the flexible operation of the manipulator is nothing but “Cohen-Coon PID Controller”. The proposed PID Controller drives to get flexibility in operation of double link manipulator. The entire topology has been studied, investigated, modeled and simulated on double link manipulator only. The overall simulation for test system can be carried out in control tool box of MAT Lab M-File Technique. Each link of double link manipulator was simulated by assigning the state variables in M-File. So that highly graphical facilitations are provided for showing the variation in tip-vibrations and pay-load torque responses for Theta_1 and Theta_2 of double link manipulator. However, the Proposed Robust PID Controller shows better performance rather than the normal conventional Closed Loop PID Controllers.

Electrospinning technique is currently one of the most important methods for preparing nanofiber. It is important and essential to analyze the distribution of electric field in electrospinning machine. The electric field’s distribution in the typical electrospinning device was calculated and analyzed based on finite element calculation theory of electric field. The electric field is optimized by the optimization of the structure parameters, and a set of optimal sequence is got. Based on the experimental system of the electrospinning machine, contrast experiment is performed in before and after the optimization of electric field. The experimentation results show that the distribution of fiber diameter of polyimide non-woven fabric is equal and has an certain directivity after adding assistant electric field. The simulation analysis provides an effective reference for the optimization design of electric field’s distribution in the electro-spinning device.

The dynamic pressures at a distance of 500mm away from the spout for the aircraft tire burst jets were measured in the aircraft main landing gear. The dynamic pressures were treated for equivalent static pressures while the distributions of the equivalent static pressures were simulated by linear and cubic spline interpolation functions based on MATLAB software. The results showed that the equivalent static pressure close to the middle region of the sector is relatively large at the same distance from the spout. The distributions by linear interpolation are more uniform than cubic spline interpolation, but the results from the cubic spline interpolation are more rounded than the other. The equivalent static pressure less 500mm away from the spout was obtained by the interpolations. Moreover, the equivalent static pressures are usually higher by cubic spline interpolation than linear interpolation.

Making Web Services secure means making SOAP messages secure and keeping them secure wherever they go. Several security standards of Web Service Security (WS-Security), such as XML Digital Signature, are used to secure SOAP messages exchange in Web Service environment. However, the content of a SOAP message, protected with XML Digital Signature, can be changed without invalidating the signature. In this paper, we present a study on detection techniques of XML Rewriting attacks in Web Services. We first explore the XML Rewriting Attack that can take place in Web Service communication. We further investigate detection techniques and describe their limitations. Finally, we discuss general countermeasures for prevention and mitigation of XML Rewriting attacks.

As railroad bridge is one of the most important infrastructures of railway, the safety of bridge has a direct effect on railway operation efficiency and safety. In this paper, we propose a distributed railway bridge monitoring platform based on the Internet of Things (IOT) to monitoring the state of bridge safety. We made detailed research on the sensor nodes deployment, sensing data updating and early warning mechanisms of the wireless sensor network. The proposed system achieved the desired purpose of real-time monitoring of railroad bridge safety during test in China Railway Corp.

In this paper, first, the nonlinear mathematical model of special Blowdown Supersonic Wind Tunnel (BSWT) consisting of a set of ordinary differential and algebraic equations is developed in Matlab/Simulink software environment. At the second step, an Artificial Neural Network (ANN) is used for finding the optimum membership functions of the Fuzzy Logic Controller (FLC) system. This method can help for reasonable system recognition. In this step, by designing and training a feed-forward multilayer perceptron neural network according to the available database which is generated from mathematical model; a number of different reasonable functions for Valve Opening Angle (VOA) in various test conditions are determined. These functions are used to define the desired VOA fuzzy Membership Functions (MFs). Next, a Proportional-Derivative FLC (PD-FLC) system is developed in the Simulink toolbox to control a relationship between the stagnation pressure and the temperature in the plenum chamber, which presents the Reynolds number in the test section. A synthetic algorithm combined from FLC and ANN is used to design a controller for a BSWT with the aim of achieving the accurate and acceptable desired results. Performance of the BSWT using optimized fuzzy controller by ANN is found to be satisfactory, as confirmed by the results.

Both chronic problems of hearing aid have been solved by a probabilistic signal processing algorithm. The algorithm was implemented into a low and single voltage and low power dsp ic chip which can be used as a hybrid of the hearing aid. Both simulated and experimented results show clear noise reduction as well as feedback cancellation. The computational capacity of the physical chip was practically discussed for the limit of the algorithm.

In this paper, different control methods have been investigated for an earth observation satellite with push broom imaging. In pushbroom Imaging scan method, the satellite should be able to follow a certain path. Forward Motion Control method has been used to improve image quality. Due to the need for fine pointing and mild attitude maneuvers, reaction wheels are chosen as the control actuator. In this paper, PID, Fuzzy and extended LQR controllers is designed for a nonlinear model of a satellite. Research results show that controller with PID Quaternion feedback has average precision with less computation. LQR controller with the extension of the cost function has the best tracking accuracy. Fuzzy controller generates Minimum control torque in comparison others.