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This paper is aimed to assess the accuracy of HY-2A altimetry system. To further improve the accuracy and performance of HY-2A observed SSHs, several new treatments including 4 parameters maximum likelihood estimation (MLE4) retracking for Ku and C band, non-parameter sea state bias (NPSSB) model, and reprocessed dual-frequency altimeter ionospheric correction are included. The evaluation from dual-crossover...
Semisupervised classification method can improve classification accuracy using information of large non-labelled samples, whereas it bears a high cost to obtain labelled samples in hyperspectral image classification. Usual semisupervised classification methods need directly to estimate the classification of every sample in test group. A semisupervised classification method based on label mean is proposed...
Study of reciprocity helps to find influential factors for users building relationships, which greatly facilitates the social behavior understanding in trust networks. In the previous literature, the dynamics of both network structure and user generated content are rarely considered. Our investigation of the available timing information from a real-world network demonstrates that time delay has significant...
Popularity prediction is a key problem in networks to analyze the information diffusion, especially in social media communities. Recently, there have been some custom-build prediction models in Digg and YouTube. However, these models are hardly transplant to an incomplete social network site (e.g., Flickr) by their unique parameters. In addition, because of the large scale of the network in Flickr,...
Constructing a router-level topology map of an IPv6 network is important for understanding the internal properties of IPv6 networks, building new applications, network management, etc. However, the well-known topology discovery tool, traceroute6, can only obtain interface-level topology information, which creates a significant problem known as IPv6 alias resolution. Though the inaccuracy and incompleteness...
Considerable effort has been spent on collecting all the information of routers by using traceroute-like probes in the router-level topology measurements. This method has been argued to introduce uncontrolled sampling biases on statistical properties of the sample graph and heavy load to the network being measured. In order to improve the quality of the maps induced by the method, researchers are...
With the rapid development of IPv6 network, constructing a router-level topology of IPv6 is helpful for network management, network simulation, protocol design, etc. As same as IPv4, the well-known IPv6 topology discovery tool, traceroute6, also brings an important problem named alias resolution. In this paper, we present one novel heuristic method, called Route Positional Method (RPM), for IPv6 alias...
Characteristics of surface defects of hot rolled steel plates were analyzed, and an algorithm for detection of hot rolled steel plates was developed. Based on undecimated wavelet transform and mathematical morphology, the algorithm can solve the problem of false alarms by scales and water marks. Positions of defects were determined by modular maximum of inter-scale correlation of wavelet coefficient...
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