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A fast iterative method for minimizing the peak sidelobe level of an antenna array is presented, which is based on the non-uniform fast Fourier transform (NUFFT). Due to an inverse Fourier transform relationship between the array factor and the element excitation, the FFT can be used for optimizing the element excitation and array factor alternatively by interpolating the non-uniform arrays into oversample...
To reconstruct objects buried in layered media, most of current imaging methods are based on a common assumption that the dielectric properties of layered media are given. However, this assumption is unrealistic in practice. To study a more realistic electromagnetic inverse scattering problem in which the dielectric properties of layered media are not given, an inverse scattering series (ISS) method...
Underwater Seismic Imaging (USI) is an acoustic technology that can provide the geographic information of seafloor and sub-seafloor. A laboratory sized scaled experiment system of the underwater seismic imaging system is designed and built to support the imaging and inversion algorithm research of USI. It integrates the fundamental electronic instruments and acoustic sensors with computer and basic...
As our world's competitive global economy continues to development, Chinese software industry, though enjoying an impressive growth. Therefore, it is an important issue for decision makers to evaluate each of the local software industry development and put in the corresponding development policy. This paper, based on aggregative rank, analyses the local software industry operating income and get the...
This paper describes a management platform for a web client side of internet-based electrical engineering lab using SSH framework. This experiment platform covers 6 subjects, dividing users into 6 levels of authority to manage. Because of the excellent scalability, the management platform can be developed into an integrative system with combination of virtual and physical experiment.
Based on the research of principle of grayscale power transformation image enhancement combining grayscale distribution characteristics, this paper introduces a self-adaptive criterion for obtaining the transform coefficient. We process several images by power transformation with this criterion. The result shows that for images with continuous grayscale histogram distribution, the method can highlight...
Unsaturated granite residual soils are widely used as compacted soils in engineering structures such as slopes, embankments and backfills. Shear strength of soil are important in many geotechnical problems. A series of unconfined compression tests are carried out on unsaturated residual soils. Furthermore, since the residual soils are impaired in contact with water and have poor water-stable properties,...
Aiming at problems that Chinese Universities lack of internal self-restraint mechanism and a complete, institutionalized and standardization internal quality assurance system, a all-directional, multi-dimensional Undergraduate Teaching Evaluation System is established in this paper. Support vector machine (SVM) is used to evaluate undergraduate majors teaching level in the paper. According to training...
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