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Real-time Monitoring for Freezing and Thawing Process of Subgrade in Seasonal Frozen Regions
Li MingBao,Zheng Xian,Zhang JiaWei 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.6
This research shows that there is a cosine changing of the distribution of the temperature field on an annual cycle, and a temperature changing lag exists for the different depth of subgrade. Based on the law of frozen depth of subgrade, the frozen procedures can be divided into four stages. Based on the observation data, the cathode surface temperature is positively correlated with both the frost heave quantity and the frozen depth. In addition, to reduce the observation cost and the measure difficulty, the frost heave quantity can be obtained through the observation of the frozen depth.
Plant Sap Flow Wireless Sensor Network Base on DF-MAC Protocol
Zhang Jiawei,Song Wenlong,Li Mingbao 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.7
Plant sap flow detection plays an important role in water consumption research and plant growth rule. Wireless Sensor Networks (WSN) can effectively realize that transmit the data back to PC. How to prolong the service life of wireless sensor network with the limited energy is a key point. To solve the problem, a novel energy-efficient division-frame MAC (DF-MAC) protocol applied for Wireless Sensor network to detect plant sap flow is proposed in this paper. The idle listening time is shorten in DF-MAC, and wireless equipment is operated in low power of sleep mode to save energy when data transmission is not occurred. DF-MAC has two major characteristics: low number of collisions and low duty cycle. The nodes of sensor in DF-MAC have shorter listening time that would save the power of communicating with other nodes. The number of collisions is minimized in DF-MAC which can save the energy required to send data packages again. According to the consequences of simulation, the energy depletion of DF-MAC Protocol is much lower compared with the existing MAC. DF-MAC is of theoretical and applied significant for plants sap flow measurement in practice.