Mathematics, Statistics & Physics: المرسلات الحديثة
السجلات المعروضة 281 -- 300 من 819
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An unbalanced ranked-set sampling method to get more than one sample from each set
( American Association for Public Opinion Research , 2018 , Article)In ranked-set sampling, the restriction of selecting just one individual from each set may require too many sets. We propose a new version of ranked-set sampling that relaxes this restriction. Our new design uses stratified ... -
Adaptive and unequal probability survey designs for environmental management
( The Modelling and Simulation Society of Australia and New Zealand Inc , 2011 , Conference)Designing an efficient large-area survey is a challenge, especially in environmental science when many populations are rare and clustered. Adaptive and unequal probability sampling designs are appealing when populations ... -
Horvitz-thompson estimator of population mean under inverse sampling designs
( Iranian Mathematical Society , 2012 , Article)Inverse sampling design is generally considered to be an appropriate technique when the population is divided into two subpopulations, one of which contains only a few units. Here, we de- rive the Horvitz-Thompson estimator ... -
Complete allocation sampling: An efficient and easily implemented adaptive sampling design
( Wiley , 2010 , Article)Adaptive sampling designs are becoming increasingly popular in environmental science, particularly for surveying rare and aggregated populations. An adaptive sample is one in which the survey design is modified, or adapted, ... -
Asymptotic properties of the sample mean in adaptive stratified sequential sampling with multiple selection criteria
( Iranian Mathematical Society , 2013 , Article)We extend the method of adaptive two-stage sequen-tial sampling to include designs where there is more than one crite-ria used in deciding on the allocation of additional sampling effort. These criteria, or conditions, can ... -
Multi-species attributes as the condition for adaptive sampling of rare species using two-stage sequential sampling with an auxiliary variable
( The Modelling and Simulation Society of Australia and New Zealand Inc , 2011 , Conference)Assessing populations of rare species is challenging because of the large effort required to locate patches of occupied habitat and achieve precise estimates of density and abundance. The presence of a rare species has ... -
Use of post-stratification in composite sampling for estimating mean
( Springer , 2011 , Article)We show with the results of a study conducted in the Hamadan Province, Iran as to how the use of composite sampling for estimating mean zinc concentration in the soil can help reduce analytical costs by reducing the number ... -
Adaptive two-stage inverse sampling design to estimate density, abundance, and occupancy of rare and clustered populations
( Public Library of Science , 2021 , Article)Sampling rare and clustered populations is challenging because of the effort required to find rare units. Heuristically, a practitioner would prefer to discontinue sampling in areas where rare units of interest are apparently ... -
Students Impression About Using Mobile Phones in Classroom
( Kassel University Press GmbH , 2020 , Article)Mobile phones are widely used by university students and there is a controversial topic whether students should be able to use them freely during lectures. A survey was distributed seeking student opinions on using mobile ... -
Sampling of Multiple Variables Based on Partially Ordered Set Theory
( Iranian Statistical Society , 2021 , Article)We introduce a new method for ranked set sampling with multiple criteria. The method relaxes the restriction of selecting just one individual variable from each ranked set. Under the new method for ranking, units are ranked ... -
The effect of graphene on the activation energy of grain growth for the nanocrystalline thermoelectric n‑type Bi2Te2.7Se0.3
(2022 , Article)Even though bismuth telluride is frequently produced by mechanical alloying for thermoelectric materials, no data has been published addressing the thermal behavior and activation energy of the milled n-type Bi2Te2.7Se0.3 ... -
Effects of previous infection, vaccination, and hybrid immunity against symptomatic Alpha, Beta, and Delta SARS-CoV-2 infections: an observational study
( Elsevier , 2023 , Article)BackgroundProtection against SARS-CoV-2 symptomatic infection and severe COVID-19 of previous infection, mRNA two-dose vaccination, mRNA three-dose vaccination, and hybrid immunity of previous infection and vaccination ... -
Population immunity of natural infection, primary-series vaccination, and booster vaccination in Qatar during the COVID-19 pandemic: an observational study
( Elsevier , 2023 , Article)BackgroundWaning of natural infection protection and vaccine protection highlight the need to evaluate changes in population immunity over time. Population immunity of previous SARS-CoV-2 infection or of COVID-19 vaccination ... -
Large-scale global optimization based on hybrid swarm intelligence algorithm
( IOS Press , 2020 , Article)There are numerous large-scale global optimization problems encountered in real-world applications including engineering, manufacturing, economics, networking fields. Over the last two decades different varieties of swarm ... -
A hyperbolic penalty method to solve structured convex minimization problems
( Institute of Advanced Science Extension (IASE) , 2020 , Article)This paper presents a decomposition algorithm based on the smooth hyperbolic penalty, which leads to a scheme suitable for parallelized computations. The proposed algorithm can be seen as a separable version of the earlier ... -
A weighted version of Hermite-Hadamard type inequalities for strongly GA-convex functions
( Institute of Advanced Science Extension (IASE) , 2020 , Article)In this paper, we have established new weighted Hermite-Hadamard type inequalities for strongly GA-convex functions. Those findings are obtained by using geometric symmetry of continuous positive mappings and differentiable ... -
The common solutions of the split feasibility problems and fixed point problems
( Springer International Publishing , 2015 , Article)An extraordinary split problem, which can be regarded as a superimposition of the split feasibility problem and the split fixed point problem, is considered. A superimposed algorithm is presented. The analysis technique ... -
Optimal Production Planning Strategy for Deteriorating Items in Terms of Emission Tax, Pollution, and R&D Investment
( Springer Science and Business Media B.V. , 2018 , Conference)Firms are faced with the question of what policies to implement to ensure efficient abatement behavior? In this paper, we aim to determine the optimal production rate and the optimal investment rate in pollution abatement ... -
Robust index-tracking and enhanced index-tracking in portfolio optimization
( Ascociacion Internacional de Economia Aplicada , 2020 , Article)We study index-tracking and enhanced index-tracking problems in portfolio optimization under interval uncertainty for returns and covariance matrix. The proposed robust counterparts for both models are in the form of second ... -
Entropy-Like Minimization Methods Based on Modified Proximal Point Algorithm
( University of Toronto Press Inc. , 2014 , Article)In this paper we introduce an extension of the proximal point algorithm proposed by Guler for solving convex minimization problems. This extension is obtained by substituting the usual quadratic proximal term by a class ...
