Declustering techniques reduce query response time through parallel I/O by distributing data among multiple devices. Except for a few cases it is not possible to find declustering schemes that are optimal for all spatial range queries. As a result of this, most of the research on declustering has focused on finding schemes with low worst case additive error. However, additive error based scheme...

Previous studies have shown that adaptation to a sinusoidal grating raises the contrast threshold for detecting gratings of similar spatial frequency and causes a shift in the apparent frequency of gratings of neighboring spatial frequency. In the present study the threshold rise and frequency shift were studied under two conditions: after adapting to a grating (successive condition) and while ...

terns of this non-resonant system exhibit spatial line narrowing with the increase of feedback, resembling the line narrowing in (resonant) lasers (see Fig. 1). In fact, despite the incoherence of the light, this cavity threshold is analogous to many thresholds in resonant feedback systems with gain.1 In a subsequent paper, we theoretically analyzed a cavity in which the light was also spatiall...

Local dC/dV spectroscopy performed in a scanning capacitance microscope ~SCM! was used to map, quantitatively and with high spatial resolution (;50 nm), lateral variations in the threshold voltage of an AlxGa12xN/GaN heterostructure field-effect transistor epitaxial layer structure. Scanning capacitance and the associated threshold voltage images show small round features less than 150 nm in di...

The use of pastures is part of common herd management practices for livestock animals, but contagion between animals located on neighbouring pastures is one of the major modes of infectious disease transmission between herds. At the population level, this transmission is strongly constrained by the spatial organization of pastures. The aim of this study was to answer two questions: (i) is the s...

Long-term memory can be based on general familiarity or detailed recollection. Although familiarity is thought to be a continuous/graded process, the nature of recollection is currently under debate. In the present functional MRI spatial source memory study, we evaluated the pattern of activity in the hippocampus to assess whether this region operates in a threshold/all-or-none or a continuous ...

Accurate information on the distribution of existing species is crucial to assess regional biodiversity. However, data inventories are insufficient in many areas. We examine the ability of Multivariate Adaptive Regression Splines (MARS) multi-response species distribution model to overcome species' data limitations and portray plant species distribution patterns for 199 South Korean plant speci...

As odor concentration increases, primary olfactory network representations expand in spatial distribution, temporal complexity and duration. However, the direct relationship between concentration dependent odor representations and the psychophysical thresholds of detection and discrimination is poorly understood. This relationship is absolutely critical as thresholds signify transition points w...

Sparse superposition codes, or sparse regression codes, constitute a new class of codes which was first introduced for communication over the additive white Gaussian noise (AWGN) channel. It has been shown that such codes are capacity-achieving over the AWGN channel under optimal maximum-likelihood decoding as well as under various efficient iterative decoding schemes equipped with power alloca...

in this paper, the effects of reflected waves of the facets on the internal optical intensity of semiconductor dfb lasers are investigated. the uniformity of optical intensity along the cavity length is evaluated with flatness parameter. the dependence of this parameter on coupling coefficient, reflectivity and grating phase at the facets is also studied. this investigation shows that in some s...