Results 51 to 60 of about 965,383 (215)

Accurate FDG PET tumor segmentation using the peritumoral halo layer method: a study in patients with esophageal squamous cell carcinoma

open access: yesCancer Imaging, 2018
Background In a previous study, FDG PET tumor segmentation (SegPHL) using the peritumoral halo layer (PHL) was more reliable than fixed threshold methods in patients with thyroid cancer. We performed this study to validate the reliability and accuracy of
Sungmin Jun, Jung Gu Park, Youngduk Seo
doaj   +1 more source

The Technical Performance of the HEGRA System of Imaging Air Cherenkov Telescopes [PDF]

open access: yesAstropart.Phys.20:267-291,2003, 2003
Between early 1997 and late 2002, the HEGRA collaboration operated a stereoscopic system of 4 (later 5) imaging atmospheric Cherenkov telescopes. In this paper we present the calibration schemes which were developed for the system, and report on the performance of the detector over the years.
arxiv   +1 more source

Effect of Local Inhomogeneity on Nucleation; Case of Charge Density Wave Depinning

open access: yes, 1998
The spatial inhomogeneities are expected to affect nucleation process in an essential way. These effects are studied theoretically by considering the case of the depinning of the charge density wave as a typical example.
Fisher D. S.   +11 more
core   +1 more source

Unsupervised software defect prediction using median absolute deviation threshold based spectral classifier on signed Laplacian matrix

open access: yesJournal of Big Data, 2019
Area of interest The trend of current software inevitably leads to the big data era. There are much of large software developed from hundreds to thousands of modules.
Aris Marjuni   +2 more
doaj   +1 more source

Reproducibility of Baseline Tumour Metabolic Volume Measurements in Diffuse Large B-Cell Lymphoma: Is There a Superior Method?

open access: yesMetabolites, 2021
The metabolic tumour volume (MTV) is an independent prognostic indicator in diffuse large B-cell lymphoma (DLBCL). However, its measurement is not standardised and is subject to wide variations depending on the method used.
Florian Eude   +5 more
doaj   +1 more source

Does the impact of economic inequality on maternal and child health inequality exhibit a threshold effect? Evidence from China

open access: yesGlobal Public Health
When the economy (economic inequality) develops to a certain level, does the impact of economic inequality on health inequality change? Through threshold regression, this study analyses the impact of city-level economic inequality on the absolute and ...
Yao Yao, Yujie Cui, Wei Luan, Gordon Liu
doaj   +1 more source

Density modulation-induced absolute laser-plasma-instabilities: simulations and theory [PDF]

open access: yes, 2016
Fluid simulations show that when a sinusoidal density modulation is superimposed on a linear density profile, convective instabilities can become absolutely unstable. This conversion can occur for two-plasmon-decay and stimulated Raman Scattering instabilities under realistic direct-drive inertial confinement fusion conditions and can affect hot ...
arxiv   +1 more source

Gain and Loss in Quantum Cascade Lasers

open access: yes, 2001
We report gain calculations for a quantum cascade laser using a fully self-consistent quantum mechanical approach based on the theory of nonequilibrium Green functions. Both the absolute value of the gain as well as the spectral position at threshold are
A. Wacker   +13 more
core   +2 more sources

Bounding inconsistency using a novel threshold metric for dead reckoning update packet generation [PDF]

open access: yes, 2008
Human-to-human interaction across distributed applications requires that sufficient consistency be maintained among participants in the face of network characteristics such as latency and limited bandwidth.
Aspin, R   +5 more
core   +2 more sources

Solitons and kinks in a general car-following model

open access: yes, 2012
We study a car-following model of traffic flow which assumes only that a car's acceleration depends on its own speed, the headway ahead of it, and the rate of change of headway, with only minimal assumptions about the functional form of that dependence ...
B. S. Kerner   +2 more
core   +1 more source

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