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Articles by Junguo Zhang
Total Records ( 4 ) for Junguo Zhang
  Yi Wang , Junguo Zhang , Linfan Tao and Xin Jin
  Nowadays, new requirements have been put forward for university construction in order to build a conservation-minded campus. Due to the lack of effective management mechanism and management, campus energy consumption has a lot of problems such as data measurement inaccuracies and the lack of measurement. As a brand-new campus energy management, energy monitoring platform will effectively improve the level of the energy management work so as to get recognition from the administrators in the universities. Based on the energy monitoring platform construction of a university in the north, which is designed with the consideration of the pratical situations of the university. The information transmission network of the platform is established according to the optical fiber ring network. The water metering, electricity metering and environmental monitoring at the key building of the campus are achieved in the energy platform. It is worth mentioning that the sub-items and household electrical metering realized in the building. It can figure out the energy conserving potential of the campus buildings according to the energy monitoring platform data analysis, providing strongly technical support and abundant data basis for energy-saving renovation project of the campus.
  Qiumin Xiang , Junguo Zhang , Xin Luo , Yuying Cheng and Chen Wang
  Wildlife monitoring is the basis of effective protection, sustainable use and scientific management of wildlife resources. In order to obtain image information of wildlife monitoring remotely and in real time, wireless multimedia sensor network was introduced to the field of wildlife monitoring. The key of acquiring and transmitting image through wireless multimedia sensor network is image compression. However, the traditional image compression algorithm is not suitable for wireless multimedia sensor network owing to its computational complexity, long compression time, large volume of compression data and other shortcomings. The compressed sensing theory put forward in recent years, has achieved a low-speed sampling signal coding and accurate reconstruction and greatly reduces the computational complexity and also provides a new way of thinking to improve the conventional image compression algorithm. This study demonstrates the advantages of using wireless multimedia sensor network to monitor wildlife and expounds the basic principle of compressed sensing theory and its application in image compression. On this basis, the study also discusses the possibility that image compression algorithm based on compressed sensing theory is applied to wireless multimedia sensor network. Last but not the least, it is confirmed that image compression algorithm based on compressed sensing theory is suitable for wireless multimedia sensor network by doing the simulation experiments in MATLAB.
  Zhipeng Zhang , Yuanhao Dang and Junguo Zhang
  There exists a considerable amount of water in standing trees. The moisture content of standing trees is of great significance to the disciplines of plant physiology, the wood drying, plant irrigation, quality evaluation of trees and prevention of disease and pest. One of the methods for the determination of standing trees is lateral impact vibration. The moisture content can be determined by measuring the resonance frequency of standing trees. The traditional tool used to induce the vibration is the wood hammer. However, it relies on human and can’t induce constant excitation. In view of the above limitations, an automatic excitation device is developed. The device consists of two parts, the mechanical structure and the control system. The mechanical structure includes the stepper motor, the mechanical arm and the base. The control system includes the MCU, the remote controller, the wireless receiver, the LCD and the stepper motor driver. The operation mode of the device can be set by the keys on the MCU or the remote controller. The device strikes the standing tree laterally and induces the vibration. It produces stable force, works automatically and promotes the efficiency remarkably in practical application.
  Junguo Zhang , Yi Wang and Fantao Lin
  Pointer instrument has been widely used in the electric power, chemical industry and other industrial fields, because of the advantages such as low price, high reliability, easy installation, replacement and so forth. The traditional manual reading method has its drawbacks for example process trival, big workload, lack of accuracy. This article, based on digital image processing techniques, studies the automatic reading recognition method for analog measuring instruments. After pretreatment of original image on the instrument dial, the pointer information will be split by binarization; The Hough transform is the main idea for line detection and then by the pointer straight line parameters and calculating the image pixel the angle and direction of the pointer can be got; Angle method is used to determine the reading of the meter pointer which is simple but effective. At the same time template matching method is used to recognize the range of pointer instrument automatically. The system software is designed by matlab on the platform of windows. By using MATLAB (gui) simulation, pointer meter reading recognition system can be constructed which includes control interface.
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