Boya Li's research while affiliated with Wuhan University and other places

... In image classification, one of the most effective ways to deal with scarce samples is data augmentation [12]- [14]. Traditional methods for image data augmentation perform a certain of geometric affine transformations on training data, 2 such as translation, rotation, mirroring, clipping and scaling, etc., which can improve the performance of classifiers without actually collecting more data. However, since the sea-land clutter data is radar echo signal, the above-mentioned methods for image data augmentation may destroy the classification-related features of sea-land clutter. ...

... Let u 0 1 = u 0 T ,r 0 k  à T , synthesize all the pseudo-linear equations of formula (25) to obtain the positioning equation in matrix form of the vector to be sought: ...

... Algorithms for the target localisation and velocity estimation for multistatic radar systems with differing architectures have been proposed in the existing literature, for example, [11], and the CRLB is derived to analytically show the efficiency of the estimator. An overview of the key general classifications for multistatic radar target localisation algorithms is mentioned in Ref. [12], and a joint method for target position and velocity estimation based on the principles is proposed and numerically assessed for scenarios containing a multiple-Tx-multiple-Rx system. ...

... This characteristic helps the system work well even in a noisy environment [6]. The sparsity-based method can be classified into the l p -norm minimization method [7][8][9] and the sparse Bayesian learning (SBL) method [10][11][12][13]. The l p -norm-based method uses the l p -norm to enforce sparsity with a well-tuned regularization parameter. ...

... When a visible laser is irradiated between the metal-coated tip and metal surface, a photoinduced force acts on the tip owing to the enhancement of the electric field at the tip-sample junction. This photoinduced force due to the electric field enhancement in the tip-sample gap, Fgap, can be described as follows: When light irradiates the tip-sample junction, a voltage V = V 0 e −iωt is applied between the tip and metal surface, 32 and the average electric field in the tip-sample junction, Egap is given as Egap = V/z, where z is the tip-sample distance. When we assume that the radius of the tip is large enough and the enhanced electric field is distributed only at the most apical end of the tip, the area over which the electric field is distributed is S. ...

... The maximum upper bounds were found to be in the order of 60-70%. Moreover, Zhao et al., 59 investigated the collection of solar energy by a broad-band antenna to overcome the low efficiency of a solar rectenna based on conventional nano-antennas. The antenna impedance, radiation, polarization and effective area are all considered in efficiency calculations using the nite integral technique. ...