New Low-Frequency Spread Measures

2009 ◽  
Author(s):  
Craig W. Holden
Keyword(s):  
Low Frequency ◽  
Frequency Spread

The Effect of Noise Spectrum on Speech Recognition Performance-Intensity Functions

1994 ◽  
Vol 37 (2) ◽  
pp. 439-448 ◽  
Author(s):  
Gerald A. Studebaker ◽  
Rebecca Taylor ◽  
Robert L. Sherbecoe
Keyword(s):  
Speech Recognition ◽  
Thermal Noise ◽  
Recognition Performance ◽  
Low Frequency ◽  
Noise Spectrum ◽  
Type Model ◽  
Frequency Spread ◽  
Articulation Theory ◽  
Intensity Functions ◽  
High Pass

Articulation theory predicts that a subject’s absolute or masked threshold configuration will affect the slope of the speech recognition performance-intensity (P-I) function. This study was carried out to test that prediction. Performance-intensity functions for the Technisonic Studios W-22 recordings were obtained from 12 subjects with normal hearing. Four continuous thermal noise maskers, high-pass (HP) noise, white noise, ANSI noise, and talker-spectrum-matched (TSM) noise, were used to shape threshold. P-I function slopes for the averaged data ranged from about 1.6%o/dB in HP noise to about 6.7%/dB in TSM noise. At low to moderate speech intensity levels, the positions and slopes of the P- functions were accurately estimated by an articulation index-type model that included corrections for subject proficiency and for high- and low-frequency spread of masking. At higher intensity levels, performance was overestimated by the model.

scholarly journals An estimation of cost-based market liquidity from daily high, low and close prices

2020 ◽  
Vol 6 (2) ◽  
pp. 1-11
Author(s):  
J. Saleemi
Keyword(s):  
Asset Pricing ◽  
Low Frequency ◽  
Market Liquidity ◽  
Frequency Spread ◽  
Bid Ask Spread ◽  
Proposed Model ◽  
Spread Model ◽  
Computationally Intensive ◽  
The Cost ◽  
Entire Dataset

In the literature of asset pricing, this paper introduces a new method to estimate the cost-based market liquidity (CBML), that is, the bid-ask spread. The proposed model of spread proxy positively correlates with the examined low-frequency spread proxies for a larger dataset. The introduced approach provides potential implications in important aspects. Unlike in the Roll bid-ask spread model and the CHL bid-ask estimator, the CBML model consistently estimates market liquidity and trading cost for the entire dataset. Additionally, the CBML estimator steadily measures positive spreads, unlike in the CS bid-ask spread model. The construction of the proposed approach is not computationally intensive and can be considered for distinct studies at both market and firm levels.

Phase Watermarking of Images with Complex-Valued Linear-Phase Subband Filter Banks

2013 ◽  
Vol 339 ◽  
pp. 275-280
Author(s):  
Li Chen ◽  
Rong Hua Peng
Keyword(s):  
Frequency Band ◽  
Filter Banks ◽  
Low Frequency ◽  
Linear Phase ◽  
Time Frequency ◽  
Frequency Spread ◽  
Phase Filter ◽  
Dct Domain ◽  
Dct Coefficients ◽  
Complex Valued

A new algorithm is proposed for digital watermarking by applying complex-valued linear-phase filter banks to low frequency-band coefficients of images in the DCT domain. The watermark is conveyed in the phase spectrum of the subband coefficients. The robustness of the algorithm is examined in JPEG encoding with different qualities and compared with the DFT-based approach. Because only low frequency-band DCT coefficients are applied to complex-valued filter banks, the computational load introduced by the complex-valued filter banks is kept low. The watermark decoding is only accessible to users with the key information, i.e., impulse responses of the complex-valued linear-phase filter banks that designed with time-frequency spread property.

Simulation, Design, and Testing of a High Performance Multi-Axis Hexapod for Vibration Isolation

2007 ◽  
Author(s):  
Bernie R. Jahn
Keyword(s):  
High Performance ◽  
Vibration Isolation ◽  
Low Frequency ◽  
Modal Testing ◽  
Simulation Design ◽  
Frequency Spread ◽  
Optimum Geometry ◽  
Six Degree Of Freedom ◽  
Design And Testing ◽  
Base Structure

This paper describes the simulation, design, and testing of a high-performance six degree-of-freedom hexapod for the purpose of isolating sensitive payloads from low-frequency vibrations. Design criteria required the hexapod to support a generic payload up to 500 lb with an isolation plunge frequency of approximately 1 Hz. Simulations were performed using Matlab in order to determine the optimum geometry of the base and platform structures in order to provide the best combination of translation-rotation uncoupling, frequency spread, plunge frequency, and jitter. Based on these simulation results, hexapod base and platform structures were designed and fabricated based on a 50 inch-diameter platform size. All of the accumulators and pneumatic hardware were embedded into the base structure to allow for a totally contained system. Modal testing of the hexapod was performed in order to verify the modes predicted by the model.

New low-frequency spread measures

2009 ◽  
Vol 12 (4) ◽  
pp. 778-813 ◽  
Author(s):  
Craig W. Holden
Keyword(s):  
Low Frequency ◽  
Frequency Spread

scholarly journals Which Liquidity Proxy Measures Liquidity Best in Emerging Markets?

Economies ◽  
2018 ◽  
Vol 6 (4) ◽  
pp. 67 ◽  
Author(s):  
Hee-Joon Ahn ◽  
Jun Cai ◽  
Cheol-Won Yang
Keyword(s):  
Emerging Markets ◽  
High Frequency ◽  
Low Frequency ◽  
Comprehensive Analysis ◽  
Price Impact ◽  
Frequency Spread ◽  
Tick Data ◽  
Effective Spread

This study empirically investigates the low-frequency liquidity proxies that best measure liquidity in emerging markets. We carry out a comprehensive analysis using tick data that cover 1183 stocks from 21 emerging markets, while also comparing various low-frequency liquidity proxies with high-frequency spread measures and price impact measures. We find that the Lesmond, Ogden, and Trzcinka (LOT) measure is the most effective spread proxy in most emerging markets. Among the price impact proxies, the Amihud measure is the most effective.

scholarly journals VORTICAL VLF MOTIONS UNDER SHORE-NORMAL INCIDENT WAVES

2012 ◽  
Vol 1 (33) ◽  
pp. 58 ◽  
Author(s):  
Matthieu Andreas De Schipper ◽  
Ad Reniers ◽  
Jamie MacMahan ◽  
Roshanka Ranasinghe
Keyword(s):  
Numerical Model ◽  
Incident Wave ◽  
Large Scale ◽  
Wave Spectrum ◽  
Normal Wave ◽  
Low Frequency ◽  
Velocity Fluctuations ◽  
Model Simulations ◽  
Frequency Spread ◽  
Incident Waves

Field observations and numerical model simulations are examined to investigate the magnitude of vortical very low frequency (VLF) velocity fluctuations (i.e. large scale surfzone eddies) under different offshore wave forcing. Observations of vortical VLF motions under shore -normal wave incidence at Duck, NC, USA are re-analyzed and compared with the characteristics of the incident wave spectrum. Long wave periods and narrow frequency spread incident waves were found to coincide with stronger vortical VLF motions. Numerical model simulations investigating the effect of the incident wave parameters in a more isolated way confirm the observed effect of frequency spread and wave period on the magnitude of VLF motions. Variations in incident wave spectrum resulted in changes in the vortical VLF magnitude of the same order as the magnitude of the vortical VLF velocity fluctuations themselves. These results imply that under shore-normal incident waves strong vortical VLF velocity fluctuations in the surfzone are more likely under swell conditions and at swell dominated coasts.

A Study on the Fine Structure of the Lateral Line Organ of the Sea Eel

1973 ◽  
Vol 31 ◽  
pp. 648-649
Author(s):  
K. Hama
Keyword(s):  
Fine Structure ◽  
Electron Microscope ◽  
Lateral Line ◽  
Low Frequency ◽  
Sensory Cells ◽  
Apical Surface ◽  
Voltage Electron ◽  
Sensory Epithelia ◽  
Low Frequency Vibration ◽  
Transmission Electron

The lateral line organs of the sea eel consist of canal and pit organs which are different in function. The former is a low frequency vibration detector whereas the latter functions as an ion receptor as well as a mechano receptor.The fine structure of the sensory epithelia of both organs were studied by means of ordinary transmission electron microscope, high voltage electron microscope and of surface scanning electron microscope.The sensory cells of the canal organ are polarized in front-caudal direction and those of the pit organ are polarized in dorso-ventral direction. The sensory epithelia of both organs have thinner surface coats compared to the surrounding ordinary epithelial cells, which have very thick fuzzy coatings on the apical surface.

Lectin Binding to Human Breast Tumor Cells

1976 ◽  
Vol 34 ◽  
pp. 34-35
Author(s):  
Robert E. Nordquist ◽  
J. Hill Anglin ◽  
Michael P. Lerner
Keyword(s):  
Carcinoma Cell ◽  
Ricinus Communis ◽  
Lectin Binding ◽  
Low Frequency ◽  
Breast Carcinoma Cell Line ◽  
Human Breast ◽  
Human Breast Tumor ◽  
Duct Carcinoma ◽  
Specific Antigens ◽  
Ricin Agglutinin

A human breast carcinoma cell line (BOT-2) was derived from an infiltrating duct carcinoma (1). These cells were shown to have antigens that selectively bound antibodies from breast cancer patient sera (2). Furthermore, these tumor specific antigens could be removed from the living cells by low frequency sonication and have been partially characterized (3). These proteins have been shown to be around 100,000 MW and contain approximately 6% hexose and hexosamines. However, only the hexosamines appear to be available for lectin binding. This study was designed to use Concanavalin A (Con A) and Ricinus Communis (Ricin) agglutinin for the topagraphical localization of D-mannopyranosyl or glucopyranosyl and D-galactopyranosyl or DN- acetyl glactopyranosyl configurations on BOT-2 cell surfaces.

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