Applied Mechanics and Materials Vols. 182-183

Abstract: Grid photovoltaic system’s inverter, grid device and other power electronics device consume a large quantity of reactive power, the distribution system load mostly is perceptual, it must also consume reactive power. This will make big interference interconnection of photovoltaic system after the transient voltage stability serious test. Therefore, the study grid photovoltaic system transient voltage stability is of great significance. This paper introduces the transient voltage stability of research contents, such as transient voltage stability of factors, stability criterion, the simulation calculation, and puts forward prevention transient voltage instability accident measures, and analyzes system transient voltage stability mechanism.

Abstract: This paper proposed DLMS algorithm which is suitable for real-time signal processing. The algorithm adopts hardware multiplier and pipeline technology to accelerate the operation of the system. By analyzing the time sequence and spectrum of the output signals, the attenuation of the interference signals is about 51dB. It can further demonstrate the high quality and high speed of the DLMS algorithm to filter out the interference signals, and well handle the relationship between the resources and speed of FPGA to meet the requirements of high-speed signal processing.

Abstract: A novel method for analogue VLSI implementation of programmable Gaussian function generator is proposed in this paper, in which the Gaussian function is approximated by the OTA-C filter whose frequency response is Gaussian-shaped. OTA-C circuit is very suitable for this application since the programmability can be controlled by the transconductance of OTA precisely and easily. Based on the probability argument, the OTA-C biquadratic filters and OTA-C integrator which have the cascade connection are used as the building block. To elaborate the construction procedure, a seventh-order OTA-C Gaussian function generator is selected as an example. The simulation results verify the feasibility of the presented approach.

Abstract: LM3S2110, which not equipped with A/D converters, is the microprocessor based on Cortex-M3.The design takes advantage of on-chip analog comparator to constitute the A/D converter with great precision, fast conversion speed, low cost. Equally, the excogitation also afford hardware implementation methods and software process. The conversion technology revolving about LM3S2110 controller employs the built-in comparator and the PWM module to achieve A/D conversion function through converting analog input signal into digital output signal. The results imply that the technology has high cost performance and pretty well conversion accuracy while attaining conversion.

Abstract: An embedded audio-video synchronization compression coding approach is presented. The proposed method takes advantage of the different mode types used by the H.264 encoder during the inter prediction stage, different modes carry corresponding audio information, and the audio will be embedded into video stream by choosing modes during the inter prediction stage, then synchronization coding is applied to the mixing video and audio. We have verified the synchronization processing method based on H.264/AVC using JM Model and experimental results show that this method has achieved synchronization between audio and video at small embedded cost, and the same time, audio signal can be extracted without distortion, besides, this method has hardly effect on the quality of video image.

Abstract: Through analyzing the pattern data of computerized jacquard knitting wrap machine, comparing the current storages structure and type, this paper introduces a method for Flash file structure of jacquard data. The method takes advantage of ARM chip to achieve the operations for access and modification of Flash, designing a management procedures of jacquard data access from the perspective of increasing the Flash life. The management procedures not only complete read and write operations, but also meet the requirement of jacquard high-speed data transfer.

Abstract: A Ultra Wide-Band pulse amplifier circuit based on module AH101 is designed firstly in the paper. Secondly the EMC design principle for Ultra Wide-Band pulse amplifier are described at details.In the end ,the test result of the amplifier is give out. It has some reference value for researchers who are interested in Ultra Wide-Band Pulse’s amplification.

Abstract: Modern education has put more and more emphasis on the importance of interaction between teachers and students in the classroom. One of the main directions of the digital learning research is interactive technology. This paper has designed an Interactive Response System for classroom instruction based on RFID and MAS technology. It is a technology platform, including teacher control side, students voting machines (one for each student), receivers, and supporting software.

Abstract: Image segmentation with the traditional Fuzzy C-means (FCM) algorithm only uses each pixel’s gray value, when the image is corrupted by noises, the accuracy of segmentation will be greatly reduced. So, this paper proposed an image segmentation method which based on rough sets theory and fuzzy c-mean clustering. The test result shows that the method has a good segmentation performance.

Abstract: Firstly,the article discessed intelligent furniture’s concept, characteristics and composition of the form.Secondly,it classified the intelligent furniture from different angles.According to the characteristics of intelligent furniture,we summed up the general design principles and methods of how to design the intelligent furniture.Finally,by the different function of use ,the design of intelligent furniture products were analyzed in detail.