Min Lei

Learn More
Feature extraction is a key element of pattern recognition for myoelectric control. In this paper, recurrence plots and recurrence quantification analysis (RQA) are used as the feature extractor for surface EMG signals. For eight different hand motions, two-channel EMG signals are recorded. Ten individual RQA parameters are calculated for each channel of(More)
—To protect the copyright of digital image, this paper proposed a combined Discrete Wavelet Transform (DWT) and Discrete Cosine Transform (DCT) based watermarking scheme. To embed the watermark, the cover image was decomposed by a 2-level DWT, and the HL2 sub-band coefficient was divided into 4x4 blocks, then the DCT was performed on each of these blocks.(More)
In this paper, we propose a combination method based on the empirical mode decomposition and largest Lyapunov exponent technique for the feature extraction of surface EMG signals. Subsequently, the BP neural network is used as a classifier to identify the pattern category of upper limb motions. By the recognition analysis of the surface EMG signals, the(More)
A series of bufalin 3-nitrogen-containing-ester derivatives (2-6) were designed, synthesized, and evaluated for their proliferation inhibition activities against human cervical epithelial adenocarcinoma (HeLa) and non-small-cell lung cancer (A549) cell lines. The structure-activity relationships (SARs) of this new series were described in this paper.(More)
—Few of current video watermarking algorithms can prevent HD videos from unauthorized copying after the production is distributed. This paper proposes a recoverable video watermarking algorithm in DCT domain to achieve this goal. Watermark is first split and modulated by CDMA. Then, after applying boundary detection, frames in one shot are divided into(More)
A series of bufalin-3-yl nitrogen-containing-carbamate derivatives 3 were designed, synthesized, and evaluated for their proliferation inhibition activities against human cervical epithelial adenocarcinoma (HeLa) cell line. The structure-activity relationships (SARs) of this new series are described in this paper. Cytotoxicity data revealed that the C3(More)