Results 21 to 30 of about 838,874 (266)

Time-Efficient Simulation of Free-Space Optical Communication Systems Under Atmospheric Turbulence, Pointing Error, and Angle-of-Arrival Fluctuations

IEEE Photonics Journal, 2023
Computer simulation is a powerful and convenient tool for the design and performance evaluation of free-space optical (FSO) communication systems. In this article, we present two simulation frameworks that incorporate not only the effects of atmospheric ...
Mat T. Nguyen, Vuong Mai, Hoon Kim
doaj   +1 more source

Comparison of Estimation Procedures for Multilevel AR(1) Models

Frontiers 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, Casper J. Albers, Marieke eTimmerman   +2 more
doaj   +1 more source

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

Future 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, Mirko Duradoni, Alessandro Lazzeri, Giorgio Gronchi   +3 more
doaj   +1 more source

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

Cejing 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, ZHANG Haining, DUAN Chaowei, LIU Chunlei, TANG Jin, LI Fan, WANG Hang   +6 more
doaj   +1 more source

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

Forecasting, 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

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

Frontiers 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, Inke R König, Laura B Ramsey, Mary V Relling, Wenjian eYang, Andreas eZiegler, Andreas eZiegler   +6 more
doaj   +1 more source

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

eLife, 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, Keisuke Ejima, Roger S Zoh, Andrew W Brown   +3 more
doaj   +1 more source

From Development to Validation: Exploring the Efficiency of Numetrive, a Computerized Adaptive Assessment of Numerical Reasoning

Behavioral Sciences
The goal of the present study is to describe the methods used to assess the effectiveness and psychometric properties of Numetrive, a newly developed computerized adaptive testing system that measures numerical reasoning.
Marianna Karagianni, Ioannis Tsaousis
doaj   +1 more source

Structural instability impairs function of the UDP‐xylose synthase 1 Ile181Asn variant associated with short‐stature genetic syndrome in humans

FEBS Letters, EarlyView.
The Ile181Asn variant of human UDP‐xylose synthase (hUXS1), associated with a short‐stature genetic syndrome, has previously been reported as inactive. Our findings demonstrate that Ile181Asn‐hUXS1 retains catalytic activity similar to the wild‐type but exhibits reduced stability, a looser oligomeric state, and an increased tendency to precipitate ...
Tuo Li, Pedro A. Sánchez‐Murcia, Bernd Nidetzky   +2 more
wiley   +1 more source

Chiral active systems near a substrate: Emergent damping length controlled by fluid friction

Communications Physics
Chiral active fluids show the emergence of a turbulent behaviour characterised by multiple dynamic vortices whose maximum size varies for each experimental system, depending on conditions not yet identified.
Joscha Mecke, Yongxiang Gao, Gerhard Gompper, Marisol Ripoll   +3 more
doaj   +1 more source