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Since there are a lot of complex and changing characteristics of mass in mammography with great difficulty in mass segmentation, region growing become a reliable method to accomplish it. An adaptive region growing method for mass segmentation is presented so as to improve its precision and reliability and reduce the over-growing and lack-growing when dealing with different images in one principle...
A new electrocardiogram (ECG) signal noise reduction method is presented. The core of this method is Hilbert-Huang transform (HHT) and threshold denoising, divide intrinsic mode functions (IMF) that decomposed using empirical mode decomposition (EMD) into the noise dominative layers and useful signal dominative layers. Threshold denoising proposed by Donoho et al. is adapted for the noise dominative...
A new method of heart rate variability signal analysis based on Hilbert-Huang Transform (HHT) is proposed. Use EMD (Empirical Mode Decomposition) method to decompose signal into a series of IMF (Intrinsic Mode Function). By means of the given boundary conditions and EMD decomposition termination conditions, calculate and analyze instantaneous frequency and instantaneous amplitude of each IMF using...
In this article, the tail dependence coefficient of the multivariate elliptical distribution and its properties are obtained. Furthermore, some specific tail dependence coefficients (TDC) and regularly varying elliptical distribution are given. From these results, it is easy to see that the TDC is only determined by its tail index and the correlation coefficient of the multivariate elliptical distribution...
Turbo codes has excellent error correcting performance in low SNR condition. The design of interleaver in Turbo codes directly affects the Turbo decoding performance. Based on analysing the design rules and types of interleaver, a random interleaver is designed by taking advantage of the ergodic property of m sequence. The simulation results show that applying this random interleaver can remarkably...
Based on the principle of Pipeline ADC, a 10-bit, 50-MS/s pipeline A/D converter is presented in this paper. Combining with bootstrap circuit and bottom-plate sampling technology, a high linearity on-chip sample-and-hold (S/H) is realized. This ADC is optimized for high static and dynamic performance applications in imaging and digital communications. It operates at 1.2 V power supply and achieves...
Based on the CMA, a proved blind multiuser detection, which combined with the multistage wiener filter(MSWF) for UWB systems in a realistic indoor channel is proposed in this paper. This new algorithm had a low computational complexity without the computation of matrix inverse. The proposed MSWF+CMA receiver is shown to have simpler computational complexity per weight update and faster convergence...
A blind multiuser receiver is proposed for multiuser detection of UWB systems in a realistic indoor channel. The proposed blind multiuser receiver is based on the constant-modulus algorithm (CMA), which is known to provide satisfactory performances in a blind setting. In order to overcome the CMA interference capture problem typical of a multiuser scenario, we propose to adopt a two stage receiver:...
How to distribute dividends to shareholders of a company so that the expectation of the discounted dividends can be maximized is a classical actuarial problem. Different from many papers which focus on the insurance company, this paper discusses the optimal dividend problem for another kind of company, which specializes in inventions and discovers and thus has occasional gains and constant expense...
In this paper, we present a novel approach to detect microcalcifications (MCCs) in the mammograms. Microcalcification has approximately a size of several pixels in diameter on early cancer mammograms and has low contrast. So it is difficult to detection the microcalcifications. The essential idea of propose approach is to apply morphological and wavelet transform to locate the micro calcifications...
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