Applied Mechanics and Materials Vols. 599-601

Abstract: -In the current intelligent algorithm recommendation systems, collaborative filtering recommendati

Abstract: The reconstruction algorithm has a hot research in compressed sensing. Matching pursuit algorithm has a huge computational task, when particle swarm optimization has been put forth to find the best atom, but it due to the easy convergence to local minima, so the paper proposed a algorithm ,which based on improved particle swarm optimization. The algorithm referred above combines K-mean and particle swarm optimization algorithm. The algorithm not only effectively prevents the premature convergence, but also improves the K-mean’s local. These findings indicated that the algorithm overcomes premature convergence of particle swarm optimization, and improves the quality of image reconstruction.

Abstract: Internet technology in the life to people bring convenient while, also is facing increasingly serious security threat from the network, many invaders one thousand ways to want to "see" to some concerned data or information, computer network information security is more and more attention. This article, from the perspective of the system vulnerability and network own existence safe hidden trouble, put forward to realize protection methods and strategies of network security.

Abstract: Data association model is the basis to achieve visualization management for coal mines. It guarantees the breaking of Information Island and achieving of information sharing. The paper firstly gives a process to construct the association model. Then according to the thinking that is “system study-object extraction-attribute analysis-association construction”, it gives an exploring research on the data association model for kinds of integrated automation system and management information system. Specifically, it defines four kinds of association rules.

Abstract: Since FPGA processing data, the presence of fixed-point processing accuracy is not high, and IP Core floating point unit and there are some problems in the use of design risk. Based on the improved floating point unit and program optimization algorithm is designed to achieve single-precision floating-point add / subtract, multiply, and divide operations operator. IP Core for floating-point unit design and FPGA development software provides comparative results: both the maximum clock frequency and latency basically unchanged, while the former occupies less hardware resources, to complete a plus / minus, multiply, divide computation time required for the former than the latter were reduced by 46%, 37% and 57%. The program is downloaded to the FPGA chip to get the same results with the simulation results verify the correctness and feasibility of the design.

Abstract: This paper discusses the ultrasonic rangefinder car reversing system working principle based on single chip microcomputer control. Ultrasonic ranging module HC-SR04 is called to transmit and receive ultrasound by single chip computer, temperature is detected through the DS18B20 temperature sensor, the compensation of ultrasonic velocity influenced by temperature is done, and the display and alarm of distance and temperature are achieved by combining with the peripheral circuit module. On the basis of system hardware design, system software is designed and analyzed in detail. At present, traffic accidents multiplied considerably with the exponential increase of the number of sedans in the domestic. For this reason, varied demands are put forward about reversing system. There are many varieties of reversing system, divided into three kinds: laser rangefinder reversing system, infrared rangefinder reversing system and ultrasonic rangefinder reversing system. It is the operational principle of laser rangefinder reversing system that the distance between the car and the object is figured out by calculating the time from laser shot, vehicle mounted laser transmitter emits a very fine laser to the target, to receiving the bounced laser which is received by the optoelectronic device from the target. The advantages of the system are that the range is extremely accurate and the effect of real-time control is striking. However, it is more expensive than others. Infrared rangefinder reversing system measures the distance based on the principle of infrared light without diffusion with the modulated infrared. And the measurement range generally is 1 to 5km. The real time of this reversing system is not very good but it has price advantage. Ultrasonic transmitter launches ultrasound to the obstacle, starting the timer, and the wave will be reflected .At the same time, ultrasonic receiving module detects the reflected beam constantly. Once reverberated ultrasound was detected, timekeeper stops working. According to the time displayed in the timer and the velocity of propagation of the beam in the air this moment, and after they are processed by single-chip micro-computer, the distance between car and barrier is figured out .The above is the working philosophy of ultrasonic rangefinder reversing system. The system is worse than laser rangefinder reversing system and infrared rangefinder reversing system in accuracy and real time for the influence of environment on the ultrasonic wave is relatively large. The requirements of family car for these two aspects are not very high and the ultrasonic rangefinder reversing system is cheaper than the other two systems, so this design uses the ultrasonic ranging scheme. Hardware Design of the System Transmitting and receiving ultrasonic are controlled by single-chip microcomputer in this system. First, what the system has to do is completing the ranging task without contact, detecting the temperature at the time to compensate the velocity of ultrasonic and figuring out the propagation velocity of ultrasound this moment in the air. Finally, the distance can be calculated with the speed detected by the single chip computer and the propagation. Then a series of data is processed in single-chip microcomputer and then set to the peripheral devices which fulfill the corresponding display, alarm and other tasks. So the driver can get the information quickly to make the appropriate action. Affected by the sensor characteristics, the system can carry on the distance measurement in the 3m range, the exact data shown in LCD, test and display the field temperature and compensate the corresponding velocity of ultrasonic wave to increase the applications. If the distance is less than 100 cm, buzzer makes alarm in a certain frequency, the lights of the digital pipe which is used for displaying data flashes and light-emitting diode lights to tell the driver the corresponding distance. And the frequency of buzzer becomes higher as the distance becomes closer. If the distance is beyond the measuring range, the distance display module shows 3 bars, LED lights, trembler buzz, while the temperature measurement module and the temperature display module work regularly.

Abstract: The Chirp signal has been used widely in radar signal, radar echo wave can established to be Chirp model. The estimation of radar echo wave parameter is a important task in radar signal processing. In this paper, we introduced three theories and algorithms of detection and estimation of Chirp signal: 2D peak searching algorithm, two steps searching of maximum value algorithm and pre-estimation algorithm firstly. The parameter estimation precision and computation complexity in low SNR was simulated for these three algorithms. The final simulation indicate that the two steps searching algorithm of maximum value take on nice estimation accuracy and low computation complexity in contrast.

Abstract: In this paper, we focus on the detection and relay tracking for anomalous motion targets, and present an automatic solution which combined the advantage of improved wireless sensor networks with single intelligent monitor. Particle Swarm Optimization (PSO) is used to deploy legitimately wireless sensor networks that consist of many static intelligent monitors and dynamic intelligent monitors, moving targets are extracted using Gaussian Mixture Model and the time difference method by each intelligent monitor, then each monitor judges the behavior of the motion target is legal or not by the new method couple with behavior template matching and feature points tracking. Monitors relay track the anomalous target considering the associated information and time difference between in and out to the surveillance area. The experiment results show that the solution has a better performance and less energy lost than other analogous methods.

Abstract: People in a different state of fatigue, mental status will be significantly different, brain waves are a direct reflection of mental state, and then the brain waves in different states collected will not have a significant difference as well In this paper, Fisher distance to calculate the difference between fatigue characteristics, by the characteristics of the different states to analyze, to use brain waves to reflect the purpose of human fatigue.

Abstract: This paper mainly discusses the application of the mass real-time data mining technology in equipment safety state evaluation in the power plant and the realization of the equipment comprehensive quantitative assessment and early warning of potential failure by mining analysis and modeling massive amounts of real-time data the power equipment. In addition to the foundational technology introduced in this paper, the technology is also verified by the application case in the power supply side remote diagnosis center of Guangdong electric institute.