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Two kinds of flat and stepped plates for ultrasonic radiators for the generation of high directional radiation in air are studied. The rectangular plate with free edges has no analytical solution. An approach for calculation of the directivity pattern of the sound radiated rectangular plate with free edges is developed based on the finite element method. It shows that the directivity pattern of the...
Over the past few years, we have witnessed the rapid growth of Massive Open Online Courses (MOOCs). More and more researches focus on MOOCs, especially grade prediction, due to the low completion rate in MOOCs. In this paper, we proposed a grade prediction model to automatically predict students' grades based on students' previous performances. We utilized regression, back-propagation neural network...
This paper presents a comprehensive review of Cyberinfrastructure (CI), an emerging collaborative research environment, including its representative applications in four science communities around the world. An in-depth analysis is also conducted to reveal the key functions and desired features that can be expected from modern CI systems.
This paper applies the information entropy based word acquiring algorithm to the task of Pinyin-to-character (PTC) conversion, which adopts artificial immune network model. Firstly, the artificial immune network is used to overcome the sparse data problem and the independent identical distribution (iid.) assumption. Secondly, the word acquiring algorithm based on information entropy is presented to...
A novel algorithm is proposed for solving the overlapped marker matching issues and satisfying speed requirement in a 3D video motion capture system. Firstly, the mean markers' longitudinal coordination difference in two parallel cameras is calculated to reduce 3D matching error. Secondly, the epipolar geometry restriction is used to make the corresponding marker be restricted in a line. Finally,...
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