In order to improve the accuracy of free flight conflict detection and reduce the false alarm rate, an improved flight conflict detection algorithm is proposed based on Gauss-Hermite particle filter（GHPF）. The algor...In order to improve the accuracy of free flight conflict detection and reduce the false alarm rate, an improved flight conflict detection algorithm is proposed based on Gauss-Hermite particle filter（GHPF）. The algorithm improves the traditional flight conflict detection method in two aspects：（i） New observation data are integrated into system state transition probability, and Gauss-Hermite Filter（GHF） is used for generating the importance density function.（ii） GHPF is used for flight trajectory prediction and flight conflict probability calculation. The experimental results show that the accuracy of conflict detection and tracing with GHPF is better than that with standard particle filter. The detected conflict probability is more precise with GHPF, and GHPF is suitable for early free flight conflict detection.展开更多
Correlation of the SGS (sub-grid scale) velocity between the two phases in an isotropic gas-particle two-phase flow was numerically investigated with FDF model. The results show the SGS gas velocity seen by the partic...Correlation of the SGS (sub-grid scale) velocity between the two phases in an isotropic gas-particle two-phase flow was numerically investigated with FDF model. The results show the SGS gas velocity seen by the particles varies with the relative velocities between particle phase and gas phase. The relative velocity between the two phases produces the effect of the anisotropic turbulence on the particles. The variation of Stokes number influences the magnitude of the interaction between the two phases.展开更多
The rapid progress in information technology has provided huge opportunities to fully utilize all kinds of information resource. Materials, energy, and information are the three indispensable strategic resources of hu...The rapid progress in information technology has provided huge opportunities to fully utilize all kinds of information resource. Materials, energy, and information are the three indispensable strategic resources of human society. Information is also one of the most active factors of social production. Vision is an essential approach for human beings to cognize the world： among all the information that human beings can perceive, 83% come from vision. Visual media, with image, video and digital geometry as their representatives, have already become a hot research area.展开更多
基金Supported by the Joint Project of National Natural Science Foundation of ChinaCivil Aviation Administration of China(U1333116)
文摘In order to improve the accuracy of free flight conflict detection and reduce the false alarm rate, an improved flight conflict detection algorithm is proposed based on Gauss-Hermite particle filter（GHPF）. The algorithm improves the traditional flight conflict detection method in two aspects：（i） New observation data are integrated into system state transition probability, and Gauss-Hermite Filter（GHF） is used for generating the importance density function.（ii） GHPF is used for flight trajectory prediction and flight conflict probability calculation. The experimental results show that the accuracy of conflict detection and tracing with GHPF is better than that with standard particle filter. The detected conflict probability is more precise with GHPF, and GHPF is suitable for early free flight conflict detection.
基金support of National Natural Science Foundation of China(Grant No:1077216211132008)+1 种基金the Major Projects on Control and Rectification of Water Body Pollution(GrantNo.2009ZX07424-001)the Qianjiang Talent Project(Grant No.2010R10035)
文摘Correlation of the SGS (sub-grid scale) velocity between the two phases in an isotropic gas-particle two-phase flow was numerically investigated with FDF model. The results show the SGS gas velocity seen by the particles varies with the relative velocities between particle phase and gas phase. The relative velocity between the two phases produces the effect of the anisotropic turbulence on the particles. The variation of Stokes number influences the magnitude of the interaction between the two phases.
基金Supported by the National Natural Science Foundation of China (Grant Nos. 10502044, 10772162, 50736006)
文摘The rapid progress in information technology has provided huge opportunities to fully utilize all kinds of information resource. Materials, energy, and information are the three indispensable strategic resources of human society. Information is also one of the most active factors of social production. Vision is an essential approach for human beings to cognize the world： among all the information that human beings can perceive, 83% come from vision. Visual media, with image, video and digital geometry as their representatives, have already become a hot research area.
