Cardiac elastography using radiofrequency echo signals can provide improved 2D strain information compared to B-mode image data, provided data are acquired at sufficient frame rates. In this paper, we evaluate ultrasound frame rate requirements for unbiased and robust estimation of tissue displacements and strain. Both tissue-mimicking phantoms under cyclic compressions at rates that mimic the ...

24 A method (called binaural enhancement) for enhancing interaural level differences at 25 low frequencies, based on estimates of interaural time differences, was developed and 26 evaluated. Five conditions were compared, all using simulated hearing-aid processing: (1) 27 Linear amplification with frequency-response shaping (LIN); (2) Binaural enhancement 28 combined with linear amplification a...

6 Valveless, tubular pumps are widespread in the animal kingdom, but the mechanism by which these pumps generate fluid flow are often in dispute. Where the pumping mechanism of many organs was once described as peristalsis, other mechanisms, such as dynamic suction pumping, have been suggested as possible alternative mechanisms. Peristalsis is often evaluated using criteria established in a tec...

Spectral enhancement is now being used in many hearing aids in an attempt to compensate for broadened cochlear filtering. However, spectral enhancement may be counteracted by multiband-compression algorithms designed to compensate for the reduced dynamic range of the impaired cochlea. An alternative scheme for spectral enhancement, contrast-enhancing frequency shaping (CEFS), has been proposed,...

As large-scale databases become commonplace, there has been signi cant interest in mining them for commercial purposes. One of the basic tasks that underlies many of these mining operations is querying of transaction sets for frequencies of speci ed attribute values. The size of these databases makes it important to develop summary structures capable of high compression ratios as well as suppor...

We construct a new adaptive basis that provide precise frequency localization and good spatial localization. We develop a compression algorithm that exploits this basis to obtain the most economical representation of an image in terms of textured patterns with diierent orientations, frequencies , sizes, and positions. The technique directly works in the Fourier domain and has potential applicat...

The aim of the present investigation was to compare the effects of cyclic compression, perfusion, dexamethasone (DEX) and bone morphogenetic protein-7 (BMP-7) on the proliferation and differentiation of human bone marrow stromal cells (hBMSCs) in polyurethane scaffolds in a perfusion bioreactor. Polyurethane scaffolds seeded with hBMSCs were cultured under six different conditions, as follows: ...

This paper proposes a watermarking embedding and extracting methods in the frequency domain based on a selection of a high frequency range containing large amount of information. The selected high-frequency range contributes to the imperceptibility of the watermark while the robustness against compression is achieved because the selected frequency range contains large amount of information. The...

Synthetic Aperture Radar (SAR) pulse compression on Xilinx's Virtex7 FPGA platform is an important step in SAR data processing . The realization of a multichannel pulse compression system by using all digital method has the characteristics of high reliability, strong antidisturbance, good flexibility and convenient for application. In essence, pulse compression is a method of frequency spectrum...

Lossy compression is a strategy to reduce the size of data while maintaining the majority of its useful or meaningful information. Though some data is lost in the compression process, lossy compression algorithms try to remove data that is unlikely to be considered important by a human consumer. Given this goal, today’s lossy compression techniques are carefully designed to model human percepti...