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How to achieve desired accuracy of RFID localization is challenging for high dynamic and sparse environments, especially for anisotropic RFID tags. We introduce a new method of measuring location of the active RFID tags in three-dimension space to improve localization accuracy. This research (i) provides directional signal-distribution models for both horizontal and vertical orientation of anisotropic...
Topology partition imposes significant challenge on reliable delivery of warning messages to vehicles in the zone of relevance (ZOR) in Vehicular Ad Hoc Networks (VANETs). In order to improve the probability of delivering warning messages to all vehicles in the ZOR, VANETs rely on periodic broadcast to disseminate warning messages, which brings the problem of how to set proper message lifetime for...
Accurate positions of some sensor nodes need to be calculated within wireless sensor network (WSN) in many applications, such as environmental monitoring system. This paper aims at the location method of sensor nodes in small scale WSN application scenarios; several kinds of traditional positioning methods are discussed. The main contribution of this work is to propose an algorithm based on the energy...
In this paper,the comprehensive evaluation method including the analysis of the spatial distribution of heavy metals, the evaluation of geo-accumulation index and ecological rick index is applied to evaluate the pollution of the topsoil in the city. It analyzes the main pollutants qualitatively and evaluates the degree of pollution of heavy metals and ecological harm. In the case of existing data,...
Semivariograms and its parameters have a significant impact on Kriging interpolation and stochastic simulation. This paper used GS+ and ArcGIS to research the heavy metal of Yichang citrus orchard, which used spherical model, Gaussian model, exponential model and linear model to fit the experimental semivariograms and applied these models in the Sequential Gaussian Simulation. The stochastic simulation...
The stability control of unmanned aerial vehicle (UAV) is the most important technology when it is on the duty of taking area photos. This paper aims at analyzing the structures, the corresponding channel of control and control modes in small fixed-wing UAV, and focuses on flight control system, which systematically reveals the running rules of UAV. According to the control theories in UVA, the paper...
Wireless sensor network (WSN) is widely applied to I-home, I-office, greenhouse agriculture, environment monitoring and many other industry areas. Signal attenuation and barriers make WSN hard to get high quality and reliability of network communication, which are very import to monitoring systems. This paper focus on the signal attenuation performance in WSN, analyzes the model of signal attenuation,...
Elliptic curve cryptosystem (ECC) is broadly applied to authentication, certification, key distribution and message encryption in recent years, since its quite benefit in stronger safety and computational efficiency than RSA, a primary public key system used for all most twenty years. How to improve the computational efficiency of ECC is a hot topic, the focus of this issue is at the scalar multiplication,...
Performance is very important for video communication over VANET (vehicle ad hoc network). To analyze different route protocols of VANET, a simulation tool-set is presented for evaluating video transmission performance in this paper. The tool-set integrates myEvalvid, NS2 and VanetMobiSim. With the integration, researchers can easily evaluate the quality of video transmitted over VANET and analyze...
Wireless sensor network is a newly technology t be used in landslide prediction as they provide dense data, and real-time monitoring and prediction of events. A real-time monitoring system of landslide prediction based on WSN is introduced in this paper. Statistical modeling of the landslide strain data and the distributed detection algorithm are mainly analysed. The strain data are modeled using...
Wireless sensor network (WSN) applied in electrical equipment on-line monitoring of power grid is a new network technology to prevent electric power system from failures.It integrates cheap sensors and wireless communication to provide data sampling to the status of power line. High quality and reliability of power supply is one of the most significant tasks of the system, so security issue becomes...
At present, elliptic curve digital signature algorithm (ECDSA) is one of the hottest topics in the field of information security. Its implementation with hardware is valuable to many applications in future. Scalar multiplication is one of main factors affecting the elliptic curve algorithm executive efficiency. A variable window mechanism method of combining NAF and variable-length sliding window...
Currently, the V2V (vehicle to vehicle) network relies on periodic broadcast to disseminate emergency warning messages (EWM) to locations beyond the transmission range of individual nodes. But along with it, there comes the problem of broadcast redundancy, which reduces the reliability and efficiency of the warning system. In this paper, by studying different broadcast strategy, a new efficient IEEE...
Frequent occurrences of blackouts have made the reliability of power grid much more concerned in the last few years. Recent work reveals that some important lines can have critical impact on the blackouts in power system. Based on the newest progress in the field of complex network theory, power grids are treated as small world networks. This paper calculates the topological characteristic parameters...
Secure multicast is an effective group communication technology for information sharing and message exchange in emerging grids. As the group scale in grids may be very large and group members can be very unstable (a member can join or quit the group dynamically), it is hard for conventional group key management schemes to satisfy the efficiency of group key distribution very well because of the complexity...
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