Papers by Author: Zhi Gang Wang

Abstract: Online sensors which are used to testing moisture play an important role in greenhouse system. Testing moisture which sensors is a key role to the accuracy is very important to agricultural development. The character of the sensors was directly associated with the development of greenhouse automatic system. There is no doubt that the structure of the sensors is critical to the testing results. A study of different sizes of sensors and the structure of capacitance sensors on precision was studied in the paper. We design the structure of the sensors and then conduct an experiment. According to the experiment, we decide the best size of the sensors.

Abstract: The research on Communication based on Ad hoc networks between vehicles is highly concerned about in many countries. However, Vehicular Ad hoc Networks (VANETs) is in the environment in which traditional methods have certain limitations. In this paper, vehicular network scenarios and the probability of penetration model are given. Through adding obstacles and the probability of penetration model to NS2, GPSR performs better in the new simulation scenarios.

Abstract: DATA flooding attack is a serious menace for the security of on-demand routing protocol in Ad Hoc networks. In the paper, on the basis of three typical on-demand routing protocols AODV, DSR and TORA, we present a special security scheme against data flooding attack. Then we simulate the scheme on NS2 platform and compare two performance parameters before and after using the scheme: average delay and packet delivery rate. The results indicate that this project is comparatively effective to resist the DATA flooding attack.

Abstract: Currently, the research on Vehicular Ad hoc Networks(VANETs) is hot. Vehicular movement model is an important factor, which affects the simulation results of VANETs. In the simulation of VANETs, Vehicular movement model used in the urban environment should consider not only the characteristics of the vehicular movement, but also the role of obstructing the radio waves. In this paper, after a detailed analysis of vehicle motion features, it gives a vehicular movement model based on directed graph. The simulation shows that the model can well reflect the movement of vehicles in the real world, and the influence of urban environment on the network performance.