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Based on the principle of optical designing and adjusting, by simulated the lighting and imaging of two-dimensional optical system, analyzed the influence of the location of the reflect optical element to the optical system at the situation that the aperture has restriction, finally deduced the formula between the spacing of the reflect element, the tilt reflect angle, the F number and the reflect...
Use a large aperture spherical surface as a standard mirror to test the large aperture plane mirror have been wildly studied, but most research restrain on the situation that the aperture of the standard mirror is larger than the flat. Sometimes we may not have such a large spherical mirror, and how to use a smaller standard mirror to test a large aperture flat is eager to be researched. Based on...
The sparse representation of signals with respect to an over-complete dictionary has been of recent interest in a broad range of applications. One of the most used methods for obtaining sparse codes, the Lasso problem, becomes computationally costly for large dictionaries and this hinders the use of this approach to large-scale decision tasks. Recently, dictionary screening has been used to address...
To protect the confidential of data outsourced to the cloud, we should encrypt our data before we deliver it to the cloud, but the problem is we can't sort the data, because the order of ciphertext is not always agree with the plaintext. In this paper, we propose a method of sorting based on homomorphic encryption, and the algorithm complexity is n log n. With this method, we can reduce our retrieval...
This paper proposes an approach to infer neural interactions from EEG data using a James-Stein estimator of directed information called shrinkage optimized directed information assessment (SODA). SODA uses shrinkage regularization on empirical histograms to deal with the high dimensionality of multi-channel EEG signals and the small sizes of many real-world datasets. It is designed to make few a priori...
Video description is a critical component in video streaming media processing and transmission. Different video data have different levels of contribution to the overall video presentation quality at the receiver side. on the premise of related work, video scene classification, visual sensitive regions(VSR) extraction and MGS(Medium Grain Scalability) encoding, a new approach to progressive description...
Concentrator PV systems utilize different part of solar irradiation arriving at the Earth's surface and typically generate different power profiles than traditional flat plate PV or thin film. These factors need to be taken into account during plant design, particularly for inverter sizing strategies, and will result in very different inverter size/ rated DC power ratios than flat plate PV systems...
The low-temperature joining technique of silver sintering is being actively pursued in the power electronics industry as a lead-free die-attach solution for packaging power devices and modules. However, one of the concerns of this technique is the migration of silver at a high temperature. Recently, we have reported our findings of the migration of a low-temperature sintered nanosilver in dry air...
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