The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Interactive whiteboards have been widely used in classrooms. They provide a new and strong technical support for education's informationization. Unfortunately, currently, there is not a resource database, which is adapted to the situation of China and can give better play to its advantages. Based on the integrableware theory and the study of interactive white boa rd software system and teaching functions,...
T-spline surfaces are widely used in entertainment, engineering, science and medicine. Nonuniform B-spline wavelets transformation is introduced into T-spline surfaces watermarking, and a scheme is proposed for embedding watermarks into T-spline surfaces. In watermark embeding stage, firstly, the points are selected from the standard T-spline surfaces. Secondly, the points are decomposited by nonumiform...
In the paper, firstly different wavelet bases are selected to denoise the sunspot activity data through the wavelet transformation, then the EMD analysis method are taken to decompose these two sets of signals, subsequently the physical IMF period of each layer are obtained by using FFT transform. Through the comparisons between the obtained results and the public time-scale of solar activity, we...
T-Spline surface is an important parametric surface, which is widely used in entertainment, engineering, science and medicine. A fragile watermarking algorithm is proposed for integrity authentication of T-Spline surfaces. In this algorithm, some points on T-Spline surfaces are selected by a special algorithm, then the watermark is embedded by modifing the selected points, and then the watermarked...
The original topology-transparent TDMA protocol does not perform effectively because of the collisions. In this paper a dynamic topology-transparent TDMA protocol with a novel collision-free algorithm for mobile ad hoc networks is presented. This method avoids collisions utilized the active information of two-hop nodes and dynamically adapts time-slot assignment to the changes of topology and load...
This paper proposes two data embedding algorithms for T-spline surfaces, one is suitable for steganography, and the other for robust shape-preserving watermarking. For steganography, we embed data into the points on T-spline surfaces by using constrained optimization method. For robust shape-preserving watermarking, we use the local knot insertion of T-spline surfaces. The experiment results and their...
In this paper a timing synchronization algorithm based on geometry character of synchronization metric is presented. In traditional algorithms, the results of synchronization estimation are acquired from the maximum value of metric. This method produces big variance without statistical and limit computing. In this paper trapezium fitting with those two computing is introduced to synchronization algorithm...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.