The production of greenhouse has become an important means to increase the income of China's rural areas and farmers, because the environment of greenhouses is controllable and the production is efficient. The temperature and humidity are the most important environmental impacts in the production of crop. The traditional regulation of the environment in greenhouses relies on artificial sampling detection which is inefficiency. Some advanced greenhouses use field wiring to implement the environmental regulation, but the environment is complex so field wiring is also a difficult problem. Aiming at solving the problem of monitoring the temperature and humidity in greenhouses, this paper designs a on-line monitoring system of greenhouses which is based on the wireless communication technology. The system adopts the DHT11 sensors to monitor the temperature and humidity in the greenhouse, and adopts the wireless communication technology of ZigBee so as to realize the online monitoring of the temperature and humidity. By using the wireless transmission and data acquisition nodes which are placed in different greenhouses can transmit the value of the temperature and humidity in greenhouses to the central node easily, and also realized the function of the online monitoring, alarm and transmitting data from different data acquisition nodes to the central node. The system consists of a data acquisition module, a wireless communication module, an alarm module and so on. The system is advanced because of its simple structure, small volume, low cost, easy operation, wide application range, strong scalability and so on. Compared with the traditional system, it can meet the demand of acquiring the temperature and humidity value of greenhouses in China.

According to the time and space distribution of the video sequence image motion vector and the fact that the horizontal component of the non-zero motion vector is often more than the vertical component, this paper presents a cross-diamond search algorithm for motion estimation based on projection from studying the pre-judgment zero motion vector, the starting point of search prediction, the movement type determinant, search strategy formulation and other aspects. The algorithm ensures the image quality basically unchanged. In this case, the search speed of the proposed algorithm speeds up 95-245 times than full search and 4-6 times than the fast motion estimation algorithm. The proposed algorithm has a strong real-time character and an easy hardware implementation.

Traditional mobile IPv6 switching will produce transmission delay,to the mobile communication a great deal of trouble. This switching protocol in mobile IPv6 based on the three improved switching protocol,By the four sides of switching delay、data loss,、signaling load、Complexity to compare,get the most appropriate mobile switching technology.

A DC circuit breaker (DCCB) is proposed to use superconducting technology to limit the fault current firstly and then to use self-excited oscillation method to break the limited current. The objective of this paper is to analyze the methods to reduce the arcing time of the superconducting current-limiting type DCCB. Experimental results show that superconductor limits the different fault current to a stable rising rates and a much lower amplitudes 3~12 ms later after short-circuit occurs. Simulation results show that arcing time decreases exponentially when commutation capacitance increases and it increases linearly when commutation inductance increases. Arcing time increaseswith arc power loss coefficient (N) in a negative exponential form and with arc time constant (θ) in a power exponential form.

t is very important to improve the quality of road managing, energy conservation and emission reduction to achieve lighting energy saving of highway tunnel. It used cloud model and processed the pulse waveform data when the vehicle went through loops to estimate speed; it kept the estimation of speed as the decision basis of vehicles position to estimate the vehicles position; at last, it was supposed to make the error of position estimation correct real-time to judge the position of vehicle accurately, which lighting equipments were controlled by lighting controller, so as to realize illumination on demand. The simulation and experiment results show that the algorithm can realize the measurement of vehicles position inside the highway tunnel, for purpose of energy conservation and emission reduction.