Advanced Materials Research Vols. 562-564

Abstract: The beacon drifting problem occurs when the beacon nodes move accidentally after deployment. In this occasion, the localization results of sensor nodes in the network will be greatly affected and become inaccurate. In this paper, we present a localization algorithm in wireless sensor networks in beacon drifting scenarios. The algorithm first uses a probability density model to calculate the location reliability of each node, and in localization it will dynamically choose nodes with highest location reliabilities as beacon nodes to improve localization accuracy in beacon drifting scenarios. Simulation results show that the proposed algorithm achieves its design goals.

Abstract: In order to satisfy the high accuracy velocity measurement requirement, using the improved dual-frequency laser Doppler velocity measurement principle, designed a set of laser Doppler velocity measurement system. System consists of two parts: optical system and signal acquisition and processing system. Through the establishment of dual-frequency laser Doppler velocity measurement experimental platform for testing, the result shows that the method can be carried on the high accuracy velocity measurement which in high speed move object. Measurement range from 0.1 m/s to 50 m/s, the error is less than 2 percent and it could increase the speed measurement range.

Abstract: This paper presents an application platform for meteorology observing heterogeneous wireless sensor networks (WSNs) and a data fusion weather platform. We propose system architecture for wireless sensor networks and mesh networks for handling and storing sensor data streams in real-time. It collects data from WSN and continuously transmits physical or metrology conditions at different locations to a remote central data server. A web based platform designed to enable remote online access to WSN data with interactive data retrieval and visualization functionalities.

Abstract: Over-voltages happen when electric locomotive passes the neutral section, which has serious influence on safe operation of the traction power supply system. This paper builds the model of contact net and neutral section of traction power line and analyzes transient process of the electric locomotive passing the neutral section. This paper proposes automatic control system for electric locomotive passing neutral section. It is effective to avoid the over-voltages.

Abstract: Based on the summarization of the concept of Vehicle-to-Grid and its recent development in the world, two topologies of V2G are put forward accounting for the different power supply modes. According to the analysis of the nowadays EV driving and energy system, a new topology of EV energy control system, which is suitable for application under V2G mode, is put forward, and its working principle is developed. The characteristics of this system are efficient, low cost and high integration. 1. Introduction

Abstract: An indoor positioning technique combined with wireless sensor network, RFID and photoelectric sensor is introduced into high speed stacker positioning and speed regulating systems. Compared to high precision retroreflective laser ranging sensors, the combined positioning technique can provide absolute addressing with low cost to speed up stackers. An optimization of frequency conversion motor with absolute addressing can increase improve turnover rate and reduce energy consumption of AS/RS systems.

Abstract: By analyzing the causes of ultrasonic distance measurement error, through the use of temperature compensation, and increasing the measured time interval to the microsecond level, ultrasonic ranging circuit can achieve the millimeter level. After the circuit design and construction, the ultrasonic range finder was calibrated from 1cm to 21cm. The measurement results show that in the scope of work, the linearity reached 0.999623; the measurement of the ultrasonic range finder achieved the millimeter level.

Abstract: This paper puts forward a mathematical method to measure the symmetry property of two image elements—a specific instance of the Gestalt law of symmetry. The method makes an abstract of image elements by introducing vector points and experimental results show that the computation results is consistent with the human perception interpretation in most cases.

Abstract: Pedestrian Navigation System (PNS) is a system aims at determining the current location of person, recording the walking trajectory. This paper presents an algorithm of PNS based on lowperformance MEMS-IMU attaching to the waist of people. The algorithm consists of step detection, model identification, stride, heading determination and position estimation. A method to identify a user’s status, calibrate the length coefficient K by Least-Squares and update K online according to different models and acceleration is presented, which adaptively adjusts the calculation of stride length in case of different walking speeds and manners. The integration of INS and magnetic azimuth for heading direction is put forward and the walking trajectory is calculated by Dead Reckoning (DR). Several tests have been conducted and the algorithm performed well.

Abstract: During detecting the edge of the images, the text partly use great likelihood estimation and least square method estimation algorithm to estimate, we found the result of two estimate algorithms used in the same model are different through experimental analysis. Aiming at above mentioned problems, this text divides the commonly used model in pattern process into the linear model and non-linear model, among the non-linear model, it divides into multinomial model, gauss model, shouldered index model and power counting model, and this text use great likelihood estimate algorithm and least square method estimation algorithm to estimate these models separately, and draw their scope of the application through the experiment, also provide the convenience for the future choice.