Nonlinear and stochastic dynamics is essential and practical in almost all branches of natural science and engineering.It has been a central subject to understand various complex dynamics,such as random vibration,stoc...Nonlinear and stochastic dynamics is essential and practical in almost all branches of natural science and engineering.It has been a central subject to understand various complex dynamics,such as random vibration,stochastic transition,synchronization,et al.,in the areas of mechanical and aerospace engineering,physics and chemistry.For example,the stochastic resonance has been utilized effectively in mechanical fault diagnosis and weak signal detection.Naturally,many methods have been developed to get the stochastic responses,including stochastic averaging method.展开更多
One of the main drivers for intelligent transportation systems is safety. Adaptive cruise control, as a common solution for traffic safety, lias extended from radars to cameras. Due to high mobility of vehicles and un...One of the main drivers for intelligent transportation systems is safety. Adaptive cruise control, as a common solution for traffic safety, lias extended from radars to cameras. Due to high mobility of vehicles and unevenness of roads, the picture quality of cameras has been great challenges for camera-based adaptive cruise control. In this paper, an image distortion correction algorithm is addressed. Our method is based on optical flow technology which is normally applied in motion estimation and video compression research. We are the first to attempt to adapt it in image distortion correction. Two optical flow approaches, the Lucas-Kanade method and the Horn-Schunck method, are selected and compared. The procedure of image distortion correction using the optical flow method has been tested by both synthetic test images and camera images. The experimental results show that the Lucas-Kanade method is more suitable in the correction of image distortion.展开更多
CHINA’S State Council Information Office released a white paper titled“Fighting COVID-19:China in Action”in early June.The white paper chronicles China’s all-hands-on-deck response to the public health emergency,s...CHINA’S State Council Information Office released a white paper titled“Fighting COVID-19:China in Action”in early June.The white paper chronicles China’s all-hands-on-deck response to the public health emergency,showing what makes a responsible major country in the face of a crisis.The country deserves credit for its efficiency in messaging the epidemic dynamics to its people as well as its timeliness and transparency in terms of information sharing with the international community because what it has done greatly helped both the domestic and global fights against the virus.展开更多
Daily precipitation records for summer months at fourteen stations in Shaanxi Province,China,have been analysed to determine the dependence of daily precipitation occurrence by use of MAICE and MBICE procedures.The re...Daily precipitation records for summer months at fourteen stations in Shaanxi Province,China,have been analysed to determine the dependence of daily precipitation occurrence by use of MAICE and MBICE procedures.The results show that dependence is statistically significant at all fourteen stations located in different climatic regions.Fitting of Markov chain models gives a satisfactory description of the distributions of wet and dry sequences,including long-length spells.展开更多
文摘Nonlinear and stochastic dynamics is essential and practical in almost all branches of natural science and engineering.It has been a central subject to understand various complex dynamics,such as random vibration,stochastic transition,synchronization,et al.,in the areas of mechanical and aerospace engineering,physics and chemistry.For example,the stochastic resonance has been utilized effectively in mechanical fault diagnosis and weak signal detection.Naturally,many methods have been developed to get the stochastic responses,including stochastic averaging method.
文摘One of the main drivers for intelligent transportation systems is safety. Adaptive cruise control, as a common solution for traffic safety, lias extended from radars to cameras. Due to high mobility of vehicles and unevenness of roads, the picture quality of cameras has been great challenges for camera-based adaptive cruise control. In this paper, an image distortion correction algorithm is addressed. Our method is based on optical flow technology which is normally applied in motion estimation and video compression research. We are the first to attempt to adapt it in image distortion correction. Two optical flow approaches, the Lucas-Kanade method and the Horn-Schunck method, are selected and compared. The procedure of image distortion correction using the optical flow method has been tested by both synthetic test images and camera images. The experimental results show that the Lucas-Kanade method is more suitable in the correction of image distortion.
文摘CHINA’S State Council Information Office released a white paper titled“Fighting COVID-19:China in Action”in early June.The white paper chronicles China’s all-hands-on-deck response to the public health emergency,showing what makes a responsible major country in the face of a crisis.The country deserves credit for its efficiency in messaging the epidemic dynamics to its people as well as its timeliness and transparency in terms of information sharing with the international community because what it has done greatly helped both the domestic and global fights against the virus.
文摘Daily precipitation records for summer months at fourteen stations in Shaanxi Province,China,have been analysed to determine the dependence of daily precipitation occurrence by use of MAICE and MBICE procedures.The results show that dependence is statistically significant at all fourteen stations located in different climatic regions.Fitting of Markov chain models gives a satisfactory description of the distributions of wet and dry sequences,including long-length spells.
