نتایج جستجو برای: througha systematic random sampling method

تعداد نتایج: 2220683  

2010
Olga Glotova Nikolaj Sinyavsky Maciej Jadzyn Michal Ostafin Boleslaw Nogaj

The method of random sampling was introduced for the first time in the nutation nuclear quadrupole resonance (NQR) spectroscopy where the nutation spectra show characteristic singularities in the form of shoulders. The analytic formulae for complex two-dimensional (2-D) nutation NQR spectra (I = 3/2) were obtained and the condition for resolving the spectral singularities for small values of an...

2003
Dana H. Hanselman Terrance J. Quinn Chris Lunsford Jonathan Heifetz David Clausen

In nature, populations are sometimes distributed in a patchy, rare, or aggre-gated manner. Conventional sampling designs such as simple random sampling (SRS) do not take advantage of this spatial differentiation. Thompson (1990) introduced a sampling design called adaptive cluster sampling (ACS) to survey these types of distributions. Adaptive cluster sampling, in theory, can be much more preci...

2010
Konstantin Avrachenkov Bruno F. Ribeiro Donald F. Towsley

This work proposes and studies the properties of a hybrid sampling scheme that mixes independent uniform node sampling and random walk (RW)-based crawling. We show that our sampling method combines the strengths of both uniform and RW sampling while minimizing their drawbacks. In particular, our method increases the spectral gap of the random walk, and hence, accelerates convergence to the stat...

2015
Hao Wang Zhiguo Hu

The properties of online social networks are of great interests to the general public as well as IT professionals. Often the raw data are not available and the summaries released by the service providers are sketchy. Thus sampling is needed to reveal the hidden properties and structure of the underlying network. This thesis conducts comparative studies on various sampling methods, including Ran...

Journal: :journal of ai and data mining 2015
v. abolghasemi s. ferdowsi s. sanei

the focus of this paper is to consider the compressed sensing problem. it is stated that the compressed sensing theory, under certain conditions, helps relax the nyquist sampling theory and takes smaller samples. one of the important tasks in this theory is to carefully design measurement matrix (sampling operator). most existing methods in the literature attempt to optimize a randomly initiali...

    Sampling methods have a theoretical basis and should be operational in different forests; therefore selecting an appropriate sampling method is effective for accurate estimation of forest characteristics. The purpose of this study was to estimate the stand density (number per hectare) in Arasbaran forest using a variety of the plotless density estimators of the nearest neighbors sampling me...

2006
Vibhav Gogate Rina Dechter

The paper presents a method for generating solutions of a constraint satisfaction problem (CSP) uniformly at random. Our method relies on expressing the constraint network as a uniform probability distribution over its solutions and then sampling from the distribution using state-of-the-art probabilistic sampling schemes. To speed up the rate at which random solutions are generated, we augment ...

Journal: :Environmental entomology 2007
D J Crook M K Fierke A Mauromoustakos D L Kinney F M Stephen

In the Ozark Mountains of northern Arkansas and southern Missouri, an oak decline event, coupled with epidemic populations of red oak borer (Enaphalodes rufulus Haldeman), has resulted in extensive red oak (Quercus spp., section Lobatae) mortality. Twenty-four northern red oak trees, Quercus rubra L., infested with red oak borer, were felled in the Ozark National Forest between March 2002 and J...

Journal: :Journal of Nuclear Science and Technology 2021

The CV-S method is a high-efficiency random sampling to estimate statistical moments of variables, and it uses an approximated target parameter which are linearly dependent on input as mockup parameter. In order enhance the applicability method, we propose use different from but similar whose sensitivity coefficients available. present work, nuclear fuel burnup problems concerned, standard devi...

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