Intelligent transportation system (ITS) is recognized as an important means to solve traffic problems. The most crucial way to implement ITS is real time traffic control and dynamic traffic guidance, which are all bas...
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Intelligent transportation system (ITS) is recognized as an important means to solve traffic problems. The most crucial way to implement ITS is real time traffic control and dynamic traffic guidance, which are all based on the acquisition of traffic status timely and accurately. This paper puts forward a prototype system of IVICS (integration of vehicle infrastructure cooperation system), which completely changes traditional traffic information collection method. In IVICS, equipped vehicles can be regarded as moving sensors on road network, which can collect local traffic parameters distributedly and transmit to road-side station. This paper also proposes traffic status extraction method, by interpolation of incomplete trajectory data of equipped vehicles, we can reconstruct spacial-temporal trajectories to estimate traffic density, average speed and travel time of certain road segment. Simulations of NGSIM dataset show that even equipped rate is very low, such method can get precise estimation of traffic status, which demonstrates the effectiveness of the above algorithm.
The airliner sealability, influenced by the closeness of cabin door, is an important factor affecting the flight safety during aircraft flights. In the aircraft cabin system, the state of the door can be judged by the...
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ISBN:
(纸本)9781510872745
The airliner sealability, influenced by the closeness of cabin door, is an important factor affecting the flight safety during aircraft flights. In the aircraft cabin system, the state of the door can be judged by the value of the proximity sensor output of the door. To handle the difficulty of integrated test for airliners, taking regional airliner as studying object, the paper accomplishes the simulation of the judgment trajectory of the cabin door state for testing the inductive proximity sensor, via the cubic spline interpolation algorithm on the three-axes motion platform. Meanwhile, it analyses the ARINC429 data related to the cabin door by applying ICD database which is based on virtual instrument, and the result conduced to the test of the connection path between the proximity sensor and the PACU (Position Actuation Control Unit). Therefore, the paper significantly contributes to the integration test in the aircraft cabin door assembly plant of the regional airliner.
the main objective of 3D mesh watermarking is to maximize the watermark strength while minimizing the visual *** this paper,we propose a novel 3D mesh watermarking based on the human visual system and mesh *** analyze...
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the main objective of 3D mesh watermarking is to maximize the watermark strength while minimizing the visual *** this paper,we propose a novel 3D mesh watermarking based on the human visual system and mesh *** analyze the region's mean curvature and fluctuation of curvature,and then choose the appropriate regions with high visual masking degree, in order to embed the watermark by using the interpolation *** experimental results show that the watermark is capacious,invisible and robust against various attacks.
In order to improve the control effect of alcohol and hydrogen power system and accomplish control target of dissociated methanol engine,a electronic control model based on the MAP grid interpolation method has been p...
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In order to improve the control effect of alcohol and hydrogen power system and accomplish control target of dissociated methanol engine,a electronic control model based on the MAP grid interpolation method has been put forward,and the software of Simulink has been used to simulate and verify the *** to the establishment of the control strategy and algorithm,the ECU function is calculated,the MAP grid computing results after using interpolation have been obtained,and finally the experimental values and simulation values are *** results show that it has a high precision using Simulink simulation *** comparison error of simulation and experimental results is less than 5%,the more accurate MAP electronic control three-dimensional map can be got,continuity and smoothness of the image is better,electronic control injection quantity at arbitrary rotation speed and the throttle opening degree can be checked.
A new distributed test system composed of multiple test nodes was designed by adopting storage test technology to test shock waves in explosion field. The advantage of the system is the application of sensor lattice w...
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A new distributed test system composed of multiple test nodes was designed by adopting storage test technology to test shock waves in explosion field. The advantage of the system is the application of sensor lattice whose rise time is microsecond level, which can quickly response to transient shock wave signals. In order to reduce dynamic response error, shock tube is employed to conduct dynamic calibration on the system. The overpressure peak values of the explosion shock wave collected by sensor lattice were used to construct a shock wave pressure field with B-spline interpolation algorithm.
This article proposes a novel mechanism for continuous object boundary region detection. Different from others work, we work on a fog computing environment where a few sensor nodes are deployed. This means that sensin...
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This article proposes a novel mechanism for continuous object boundary region detection. Different from others work, we work on a fog computing environment where a few sensor nodes are deployed. This means that sensing holes may exist in network regions. Based on sensory data, we interpolate on network region and find a predicted object boundary line. To cover sensing holes and detect the real boundary, mobile sensors are adopted to traverse the selected stops on boundary line. Last sensory data gathered by mobile sensors help to draw a more precise boundary area. Experimental evaluation shows that the proposed technique can detect a precise object boundary region timely and sensor nodes can work in an energy-efficient manner.
With the development of near-eye display technology, optical distortion is often introduced into the design of near-eye optical system to meet people's requirements for high definition and large field of view. How...
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With the development of near-eye display technology, optical distortion is often introduced into the design of near-eye optical system to meet people's requirements for high definition and large field of view. However, the larger the field of view, the greater the distortion of the projected image. In order to correct distorted images, this paper proposes an image pre-distortion algorithm based on nonlinear fitting and forward mapping interpolation. The radial basis function fitting algorithm is used to get a more precise mapping relationship between the original image and the pre-distorted image. The compactly supported radial basis function ( CSRBF ) interpolation algorithm based on forward mapping is used for image gray reconstruction to obtain better correction effect of image distortion. The experimental results show that the fitting error of the radial basis function fitting algorithm can be reduced to less than 1 pixel, reaching sub-pixel level. The pre-distortion algorithm has a good correction effect on the non-rotational symmetry distortion produced by the near-eye optical system, which makes the display image clear and complete.
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