Applied Mechanics and Materials Vols. 333-335

Abstract: This article introduces the design of wireless monitoring network nodes base on the JN5121 and the basic software programming with the use of API function provided by Jennic Corporation. It can realize the mesh network, multi-hop transmission, dynamic management of network and adapt to the position change of monitoring sites. The sensor nodes which use batteries to supply power take the sleeping mechanism and message-routing optimization to reduce and balance the power consumption.

Abstract: On the basis of low-pass characteristic of the ocean in extremely low frequency (ELF) band , which makes the atmospheric noise distort and signal to noise (SNR) of the receiver worse, magnitude-frequency and phase frequency characteristic of the ocean in ELF band were researched. Influence at different depth of the ocean on the atmospheric noise was simulated and frequency compensation filter was designed with the best uniform approximation method to compensate the distorted atmospheric noise. With the sampling frequency fs=1KHz, at 30m~200m depth, no more than 9th-order IIR filter was used to design frequency compensation filter. The maximal error of the magnitude-frequency characteristic of the designed frequency compensation filter is less than 0.5dB compared with the theoretical. With the filter, the sharpness of the ELF atmospheric noise spikes are restored and the SNR of the receiver is improved.

Abstract: System accuracy is an important assessment indicator for automatic test system, which is influenced by many factors such as instrument, person, and environment. The paper takes a set of automatic motor testing system for an example, the mathematic relationship between the system accuracy and the precision of instrument transformers was analyzed, which also provides a theoretical reference for the precision selection of instrument transformer when the system accuracy was known. Some improved measures such as the selection of measuring point and the calibration of transformer ratio and phase angle are put forward. Testing results verified its simplicity and efficiency, besides the novelty above, the paper also provides a new idea to improve the system accuracy of constructed test platforms without increasing the cost for exchanging a matched transformer.

Abstract: Spinneret cleaning technology is introduced in this paper. For the status of the actual production of low-efficiency, high-intensity artificial drying of the spinneret, an automatic drying process of spinneret is studied and an automatic drying machine of spinneret is studied based on PLC control technology. An experiment is conducted for the prototype of the automatic drying machine of spinneret. The experiment shows that the work efficiency of the drying machine is more than 3 times of the artificial drying and working a low noise environment is achieved.

Abstract: In order to meet the requirements of real-time and embedded of industrial field, a reconfigurable Back-Propagation neural network based on FPGA has been implemented on Xilinx's Spartan-3E (XC3S250E) chip which has 250000 gate. First the optimal network structure and weights were gotten by a variable structure of BP neural network algorithm. Then an improved hardware approaching method of excitation function was put forward, and the maximum error was 1.58% by simulation and comparative analysis on the error. Finally hardware co-imitation and timing simulation was token based on a reasonable choice of data accuracy, and then the hardware BP neural network algorithm was been downloaded and implemented on FPGA. This method has better accuracy and speed, it is an effective method of BP neural network modeling based on hardware, and lays the foundation for the hardware realization of other neural network and embedded image processing.

Abstract: In the intelligent building, the existing power supply and distribution monitoring system is mainly monitoring the voltage, current, power factor and other parameters of power supply equipments, lack of power quality monitoring, analysis and graphical display. In order to improve the power supply and distribution monitoring system in the intelligent building, this article designs a power monitoring system based on LabView, to monitor and analyze the basic parameters, harmonic, three-phase imbalance degree of power supply and distribution.

Abstract: The configurations of Erbium-doped fiber laser and comb filter that work stably have been designed. The stable multiwavelength oscillation of erbium-doped fiber laser with wavelength spacing 0.20nm in 1532nm band had been obtained at liquid nitrogen temperature by optimizing length of erbium-doped fiber and loss of cavity. The experimental results show that, the erbium-doped fiber exhibits obviously different inhomogeneous gain broadening in different band.

Abstract: In order to meet the need of real-time and dynamic monitoring of intelligent transportation, a License Plate Recognition (LPR) System Based on ARM S3C2440 is introduced and a vehicle license recognition system is designed and realized. This thesis comparatively explains the tasks and problems and dose analytic research across all phases of the system. Image binary and slant rectification also be discussed, which are difficulty points in LPR. According to the study of the license plate images, we use hough transformation and image reverse rotation , a inclined rectification method was proposed. The experimental results show that the approach is excellent in the accuracy with rapid speed and is in the robustness.

Abstract: This paper is the design of virtual dressing system based on the Kinect peripherals. The design mainly uses the real-time capture of Kinect somatosensory camera and the image recognition function to realize virtual dressing. This paper includes the introduction which is the use of virtual dressing system based on the Kinect peripherals, the selection of development platform, the function structure of the system, the program structure of design and virtual dressing implementation.