Results 31 to 40 of about 3,709,326 (303)

On Flow Characteristics and Interpretative Methods of Oil-Water Two-Phase Flow in Slightly Negative Angle Deviated Pipes

open access: yesCejing jishu, 2023
The difference of flow characteristics makes the conventional production logging interpretation model unable to accurately predict the true flowrate of each phase in horizontal wells.
QIN Hao   +6 more
doaj   +1 more source

Comparison of Estimation Procedures for Multilevel AR(1) Models

open access: yesFrontiers in Psychology, 2016
To estimate a time series model for multiple individuals, a multilevel model may be used.In this paper we compare two estimation methods for the autocorrelation in Multilevel AR(1) models, namely Maximum Likelihood Estimation (MLE) and Bayesian Markov ...
Tanja eKrone   +2 more
doaj   +1 more source

Simulating the Cost of Cooperation: A Recipe for Collaborative Problem-Solving

open access: yesFuture Internet, 2018
Collective problem-solving and decision-making, along with other forms of collaboration online, are central phenomena within ICT. There had been several attempts to create a system able to go beyond the passive accumulation of data.
Andrea Guazzini   +3 more
doaj   +1 more source

The Lasso and the Factor Zoo-Predicting Expected Returns in the Cross-Section

open access: yesForecasting, 2022
We investigate whether Lasso-type linear methods are able to improve the predictive accuracy of OLS in selecting relevant firm characteristics for forecasting the future cross-section of stock returns.
Marcial Messmer, Francesco Audrino
doaj   +1 more source

Component-based simulation for a reconfiguration study of transitic systems [PDF]

open access: yes, 2004
This paper is organized as follows. Part A presents the context of reconfiguring transitic systems and the main idea in implementing the decision step. It comprises sections 1 to 3. Section 3 presents an example that illustrates the concepts presented in
Berruet, Pascal   +2 more
core   +5 more sources

Bias in nutrition-health associations is not eliminated by excluding extreme reporters in empirical or simulation studies

open access: yeseLife, 2023
Self-reported nutrition intake (NI) data are prone to reporting bias that may induce bias in estimands in nutrition studies; however, they are used anyway due to high feasibility. We examined whether applying Goldberg cutoffs to remove ‘implausible’ self-
Nao Yamamoto   +3 more
doaj   +1 more source

A comprehensive evaluation of collapsing methods using simulated and real data: Excellent annotation of functionality and largesample sizes required

open access: yesFrontiers in Genetics, 2014
The advent of next generation sequencing (NGS) technologies enabled the investigation ofthe rare variant-common disease hypothesis in unrelated individuals, even on the genome-widelevel.
Carmen eDering   +6 more
doaj   +1 more source

Simulation Study of BPPV Fatigability

open access: yesFrontiers in Neurology, 2022
To analyze the mechanism and clinical significance of Benign paroxysmal positional vertigo (BPPV) fatigability and discuss how to eliminate BPPV fatigability. A physical simulation model of BPPV was developed to observe the effect of the Dix-Hallpike test on otolith location and explore strategies to eliminate fatigability.
Xiaokai Yang, Lidan Gao
openaire   +3 more sources

Neural activity with spatial and temporal correlations as a basis to simulate fMRI data [PDF]

open access: yes, 2009
In the development of data analysis techniques, simulation studies are constantly gaining more interest. The largest challenge in setting up a simulation study is to create realistic data.
Rosseel, Yves, Welvaert, Marijke
core   +1 more source

A Disturbed Voussoir Beam Structure Mechanical Model and Its Application in Feasibility Determination of Upward Mining

open access: yesEnergies, 2023
China is endowed with a large quantity of residual coal resources that require upward mining. The stability of interburden strata structures and accurate determination are crucial for safe mining. Therefore, we established a mechanical model of disturbed
Yujiang Zhang   +6 more
doaj   +1 more source

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