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In this paper, a vision based navigation method for autonomous landing of UAV is presented. First, the pose estimation based on the PnP problem solution is introduced. Because of the pixel position error in image, the estimation errors exist and the position errors are concussive while UAV approaches an airport, which is disadvantageous to the guidance and control for autonomous landing of UAV. Then,...
An effective lane boundaries projective model (LBPM) and improved detection method in the images captured with a vehicle-mounted monocular camera in complex environments, especially for sharp circular curve lane, is proposed in this paper. Firstly, a lane boundaries projective model is deduced. This lane model can not only express straight-line lane boundaries, but also describe the actual sharp circular...
The increasingly large ensemble size of modern High-Performance Computing (HPC) systems has drastically increased the possibility of failures. Performance under failures and its optimization become timely important issues facing the HPC community. In this study, we propose an analytical model to predict the application performance. The model characterizes the impact of coordinated checkpointing and...
This paper examines what affects government credit information systems diffusion. Based on Technology-Organization-Environment framework, Technology Acceptance Model, Innovations Diffusion Theory, and Institutional Theory, we propose a model of affecting government credit information systems diffusion under China E-government circumstance. Data collected from a survey in Shanghai are analyzed with...
The variation of positive dc corona characteristics with air pressure and humidity using a point/plane electrode system was studied in a perspex chamber allowing the pressure and humidity to be varied. A method of calculation was developed to determine the corona current for humid air over a range of pressures and humidities in which the effective ionization coefficient was calculated as a linear...
Trichel streamer pulses have been simulated at various air pressures and humidities. A flux-corrected transport algorithm based on a non-uniform mesh was applied to solve the continuity equations and Poisson's equation in a fluid model to calculate the negative streamer pulse waveforms. The values of the various coefficients for humid air, considered as a mixture of air and water vapor, were estimated...
The simulation of positive dc corona streamer pulse characteristics at various air pressures and humidities for a rod-plane electrode system has been investigated. A flux-corrected transport (FCT) algorithm, based on a non-uniform mesh, and a successive over-relaxation (SOR) algorithm were applied to solve the continuity equations and Poisson equation in a fluid model to produce positive streamer...
This Letter addresses the generalized cascade synchronization problem of discrete-time hyperchaotic systems. By choosing a general kind of proportional scaling error functions and based on rigorous control theory, we take the discrete-time Henon-like map as a example to achieve the generalized cascade synchronization. Numerical simulations are used to show the effectiveness of the proposed technique.
Separation of suspended particles with ultrasonic radiation force suggests advantages in MEMS. But there are some difficulties to position the outlets in MEMS ultrasonic separator based on one-dimensional resonance. In this paper, a new type of MEMS ultrasonic resonance separator, where two anti-phase PZT-transducers are employed to generalize two-dimensional normal mode, is analyzed. This new separator...
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