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This paper improves Itai and Rodeh's algorithm for finding a shortest cycle in an undirected unweighted graph. Given an undirected unweighted graph G with n vertices,the algorithm can determine a cycle whose length is at most k+1 where k is the length of the shortest cycle in G. The results of the experiment show that the improved algorithm runs faster than the original one when the input graph meets...
To study the effect of heading error, angular noise and target glint on precision of missiles guidance, the PN, VP and BP guidance system models were established and base on the method of adjoints and non-dimensional method, the adjoint models of the three guidance systems were obtained and the expression of non-dimensional miss distance was deduced. It is concluded that the induced miss distance...
The trajectory of a revolute welding robot with six joints was planned in order to make the trajectory smooth and working time optimal. The time intervals between each point to be welded in Cartesian space were coded in binary, and the trajectory was implemented using an adaptive genetic algorithm while considering constraints of displacement, velocity, acceleration and jerk of each joint. According...
This paper describes design of thermal control systems for CCD Focal Plane Assembly (CFPA) on the Attitude-Varied Space Camera (AVSC). In order to keep the temperature of CCD and temperature fluctuation in limited range, thermal path and the combination radiator which is composed of a radiation-panel, thermal-Interface-Panel, and phase change material are specified. Results shows that thermal control...
Chaotic signal is a non-stationary signal that has many peaks and mutations. Existence of noise influences seriously useful information to be extracted. De-noising is more necessary, especially when chaotic signals are polluted by noise. Fundamental wavelet is equal to a group of band-pass filter, different scale signals and different frequency signals are separated by different band channel. Wavelet...
This paper describes CMOS circuit design techniques for a limiting amplifier and received signal strength indicator (RSSI) circuits for the GPS receiver. The circuits in limiting amplifier and RSSI are all preudo differential to minimize the requirement of the supply voltage and be prepared against device mismatch. A folded diode load and folded cascade structure gain cell is introduced for each gain...
Based on the Proteus simulation software, the circuits of MCU controlling LED clock have been designed. The circuits include four parts: Hardware design, software programming, software simulation and physical display. Eventually, through the Proteus software simulation and physical display prove that the method of the circuit design is correct. This paper systematically introduces the design method...
K-anonymization essentially is some update operations over the original dataset. So, to guarantee the integrity of the dataset, it's necessary to preserve the functional dependencies (FDs) in k-anonymization. We present several approaches to maintain FDs in k-anonymization. One is detecting FDs violation constantly while k-anonymizing, which can be merged to numerous previous k-anonymized algorithms...
A new type of linear motor based on non resonant vibration with piezoelectric stacks was investigated. The operation principle of the motor was studied basing on the output characteristic of the piezoelectric stack. The elliptical trajectory could be excited at driving top which was proved theoretically. The structure of the motor was designed and a prototype machine was fabricated. The testing of...
In this paper, a teleoperation system with virtual reality for a construction robot is investigated. Computer graphics (CG) of the robot and task objects are presented to the operator in virtual scene as a tool for assisting teleoperation. The operator performs remote operation of the construction robot by manipulating the graphic robot directly in virtual environment using the joysticks. The position...
An effective finite element method was used for the solution of aeroelastic model of cantilevered plates forced by aerodynamic loads in axial flow. A nonlinear equation of motion of plate based on the inextensibility assumption, coupled with an unsteady lumped vortex model for the aerodynamic part was used to analyze the dynamical behaviour of this fluid-structure system. The nonlinear partial differential...
This paper presents one solution to finding all real roots of polynomial by evolution strategies according to the questions that Newton iterative method of traditional numerical computer is hard to select a suitable initial point and serial operation which leads to low efficiency in finding roots of polynomial. Hybrid evolution strategies including niche and simulated annealing and evolution strategy...
With the information security issues caused by the abuse of enterprise network resources, the objectives and functions of content auditing system are analyzed. According to the principle of content audit, the two-stage classification mechanism and open software architecture have been proposed to support the renewal and extension of application protocols. The hash algorithm for multi-pattern string...
The effective orifice area is introduced for modeling an electric-hydraulic proportional valve in paper. A second-order difference equation is adopted to describe the relationship between the effective orifice area and the input signal. The ordinary least square method is used to identify the valve model parameters, and the Householder transfer is used to solve the ill-conditioned matrix equation...
The accidents of methane explosion affect the coal mine safety in production and the lives of workers seriously. Monitoring the methane concentrations safely with real-time and accurately protection is very important. In this paper, detecting methane concentrations by the infrared methane sensing system based on infrared spectra absorption method. In view of the shortcomings used for mine sensor Currently,...
This paper presents a method of road surface condition detection with road temperature and solar radiation by BP neural network. Because road temperature depends on road surface condition (dry, wet, icy) and solar radiation (mapped to season, geographical location, time, air temperature and air humidity), and there is nonlinear causality between them, road surface condition can be detected indirectly...
In this paper, limit cycle which results from friction during low-velocity servo system has been discussed. First, the piecewise linearization method has been applied to change nonlinear stribeck model to linear model. Second, with analysis of equilibrium property, it is proved the existence of limit cycle and its certain region. The analysis reveals that it is because of stability of equilibrium...
The root lock mechanism is a key component of the space deploying mast and decides on the function of the mast. After analysis of the root lock mechanism, it is simplified as a kind of mechanism with two sliders and a spring. At first, in the situation that the mast is locked, when the root lock mechanism is disturbed, the vibration equation of the mechanism is set up. Judging methods of bifurcation...
Analyze the operating principle of segment, calculate the radial pressure on the hot rolling coiler mandrel. Simulate working condition of segment based on finite element software, make distortion analysis and stress analysis, optimize the design of segment structure, combining the distribution situation of cracks, so as to effectively improve the stress concentration problem. The application of new...
Based on the KRC model as transformation thermodynamics, a new model of the phase equilibrium temperature of X80 pipeline steel has been established by C++ under the hot deformation conditions, on which analyzing the influences of true strain, deformed temperature and strain rate. The results given by the model have good agreements with the measured value. It shows that the model can have a good accuracy...
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