Applied Mechanics and Materials Vols. 427-429

Abstract: This paper presents a high precision calibration method based on genetic algorithm (GA) for binocular vision system, involving the problems of the GA optimization and the camera modeling. For the GA optimization, both the binary-code and the real-code are considered. The binary-code makes the feasible solution approach to the optimal solution rapidly, and then the accuracy of GA is further improved by using the real-code. Furthermore, in order to improve the convergence rate of the algorithm, the parameters of the two cameras are calculated separately, and the target function is selected by the forward mapping relationship between the world coordinates and the image coordinates. The experimental results demonstrate the effectiveness of the proposed approach.

Abstract: The Unmanned Surface Vessel (USV) is researched widely due to its unattended, mobility and other advantages. In this paper, the control object is a double propeller electric propulsion USV, where the study based on. The USV motion mathematical model is studied firstly, and active disturbance rejection controller (ADRC) is applied to the USV course tracking. Simulation results demonstrate that the ADRC is effective in USV course tracking.

Abstract: Available traffic delays prediction models ^for signalized intersection tend to predict the traffic delays under certain conditions and they are weak in adapt to different situation. In the paper, based on the theories of BP neural network, a network model, having a strong ability to adapt to different conditions, for traffic delay in average hours at a signalized intersection is established. It is trained and tested utilizing the data of traffic delay in average hours at a certain entrance of a signalized intersection. The predicted results and the actual data are compared with each other and the results prove the reliability and effectiveness of BP neural network in predicting traffic delays.

Abstract: fuse trip interlock line fixed plate and front plate reinforcing ribs interference problems often occur in assembly, analyzed the data by field measurement,, establish project objectives, quantitative targets, through causal analysis, cause analysis, find the reason, the main reason to find the improvement scheme, and finally establish control plan, monitor the production situation, in order to control the situation in production. According to the investigation on the interference problem of fuse trip interlock line in installation, detailed analysis of the process, the question gives effective solutions, and dynamic quality assurance measures, provided the reference method for solving this kind of problems.

Abstract: In the design of laptop power adapter, the former stage is the power factor correction PFC converter; the after stage is DC/DC converter. The control part controls chip through an integrated PFC and PFM control integrated. In this two structures, the former stage PFC often using traditional inductor current critical conduction mode Boost converter to achieve sinusoidal input current to the whole form, thus reducing input current harmonics with a high power factor, keep a long time , simple structure and low cost.

Abstract: Hypersonic cruise vehicles traverse abroad flight envelope, severe interference and aerodynamic parameters of great uncertainty. Aiming at these problems, the attitude control system is divided into two first-order subsystem based on the backstepping, which improved by introducing the command filter and the error signal correction. simplifies the solution of pseudo control of derivative, and considering the attenuation and noise on the system state. The aerodynamic parameters wide variation range and disturbances were classified into two subsystems uncertainties, and two sets of nonlinear extended state observer (NESO) were used to estimate them. The backstepping controller based on NESO was designed with combined estimated value and backstepping method. Additionally used fuzzy logic to tuning the NESO parameters. Simulation results show that the method can track the control signal accurately, and has good robustness against parameter uncertainty.

Abstract: Introduce typical embedded device in power transmission line monitoring system and its update requirements. Analyze the drawback of traditional embedded system update mechanism over the air. Propose a security enhanced update approach with light-weight authentication protocol and recovery mechanism.

Abstract: Based Trajectory Identification projectile velocity sensor with high precision, interference, etc., but it is currently only limited to standard meteorological conditions ballistics identification, for non-standard analysis of the impact of weather conditions less. Through in-depth research paper based on the wind speed sensor ballistic missile identification accuracy, the paper introduces a non-standard method selected point on the trajectory identification wind impact speed by calculating fixed point identification result, you can calculate the velocity at any point recognition result, so as to achieve the purpose of correcting the wind effect and verified its feasibility.

Abstract: With the development of electronic technology, the electronic threats faced by microwave semiconductor devices was increasingly serious.In order to study the electrostatic discharge damage mechanism of bipolar silicon transistors, this paper analyzed the basic physical characteristics of bipolar transistor in electrostatic discharge, such as kirk effect and current crowding effect. Through analysis the human body electrostatic discharge model, established the ESD electric injury model of bipolar silicon transistor. If we knew the production process parameter of devices, we can calculate the ESD damage threshold for designing bipolar silicon device and providing a theoretical basis of parameter optimization. Finally the common ESD damage criterion were analyzed from different angles.

Abstract: This paper describes the design and implementation of executing ELF files for ARM-based multi-process micro-kernel embedded operating system, including overview of ELF files, key techniques of executing ELF files, such as installing command-line parameters and environment variables, loading ELF file, setting related registers and PCB fields, and starting the executable ELF file, etc. Based on the functionality of executing ELF files described in this paper, the corresponding shell interpreter and shell commands can be designed and executed. At the final, the paper provides some demo examples of shell commands to show the effect.