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The proliferation of location-based social networks, such as Foursquare and Facebook Places, offers a variety of ways to record human mobility, including user generated geo-tagged contents, check-in services, and mobile apps. Although trajectory data is of great value to many applications, it is challenging to analyze and mine trajectory data due to the complex characteristics reflected in human mobility,...
We propose interest seam image, an efficient visual synopsis for video. To extract an interest seam image, a spatiotemporal energy map is constructed for the target video shot. Then an optimal seam which encompasses the highest energy is identified by an efficient dynamic programming algorithm. The optimal seam is used to extract a seam of pixels from each video frame to form one column of an image,...
This paper presents a reference framework, called BUD, to manage a large shared bank of unstructured data. This paper lists several important issues on managing or maintaining the unstructured data in BUD. BUD stores and manages the ever-growing unstructured data by introducing a novel technique called free-table, which is a conceptual view for end-users and a physical entity maintained by transactional...
Rough set theory as a new mathematical tool is used to deal with the imprecise, incomplete and uncertain knowledge for pattern recognition. In current information explosion era, the powerful functions of agricultural decision support system(ADSS) on assistant decision-making and rough set on information processing is becoming increasingly obviously, and have called people's attention. According to...
With the capacity of operating in four quarters and low total harmonic distortion in the grid side, back-to-back converter became a hot spot these years. In this paper, a novel topology structure of back-to-back three-level converter was proposed, it's principle was analysed, besides, the controlling method was stated in detail. Finally, the control method was verified by simulation.
An efficient method of detecting circles, called semi- random detection (SRD) based on right triangles inscribed in a circle (RTIC), is presented. Above all, a 2D compressed array space based on the positions of valid pixels (ASPVP) is constructed. And then four points searching method is used to search the corresponding right triangles. After employing a few specific and effective tools such as radius...
In this paper, a new retarded PEEC model is proposed. The model uses current controlled current sources to account for magnetic field coupling between current cells instead of current controlled voltage sources in traditional retarded PEEC model. The computation saving is tremendous, since the L matrix is excessively large and dense for PEEC. A numerical example is given to show the validity of the...
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