نتایج جستجو برای: super population model
تعداد نتایج: 2736741 فیلتر نتایج به سال:
Simulations predict that hot super-Earth sized exoplanets can have their envelopes stripped by photoevaporation, which would present itself as a lack of these exoplanets. However, this absence in the exoplanet population has escaped a firm detection. Here we demonstrate, using asteroseismology on a sample of exoplanets and exoplanet candidates observed during the Kepler mission that, while ther...
The purpose of this study is to identify super users from the general nursing population of clinical information systems users. Q-methodology was employed to identify and categorize the viewpoints of the nurses toward the use of these systems. Four factors that represented different views regarding the use of clinical information systems were extracted. This study identifies super users'percept...
To Malthus, rapid human population growth-so evident in 18th Century Europe-was obviously unsustainable. In his Essay on the Principle of Population, Malthus cogently argued that environmental and socioeconomic constraints on population rise were inevitable. Yet, he penned his essay on the eve of the global census size reaching one billion, as nearly two centuries of super-exponential increase ...
This article considers a Bayesian approach to the multistate extension of the Jolly-Seber model commonly used to estimate population abundance in capture-recapture studies. It extends the work of George and Robert (1992, Biometrika79, 677-683), which dealt with the Bayesian estimation of a closed population with only a single state for all animals. A super-population is introduced to model new ...
Recent researches on complex systems highlighted the so-called super-linear growth phenomenon. As the system size P measured as population in cities or active users in online communities increases, the total activities X measured as GDP or number of new patents, crimes in cities generated by these people also increases but in a faster rate. This accelerating growth phenomenon can be well descri...
pepper plant capsicum annuum l. has great nutritional value and many pharmaceutical properties but its sensitivity to pests such as aphis gossypii glover, especially in drought stress conditions, has limited its production. to evaluate the effect of drought stress on the population and damage rate of this pest in greenhouse condition, four moisture treatments including; full irrigation, 15, 30 ...
Population-based Random Search (RS) algorithms, such as Evolutionary Algorithms (EAs), Ant Colony Optimization (ACO), Artificial Immune Systems (AIS) and Particle Swarm Optimization (PSO), have been widely applied to solving discrete optimization problems. A common belief in this area is that the performance of a population-based RS algorithm may improve if increasing its population size. The t...
In this paper, we focused our attention on the creation of an almost unbiased predictive product estimator after estimating and correcting bias classical under approach. Considering mean square error as performance measure, superiority proposed has been analyzed compared to Robson’s [1] (i) a finite population set-up, (ii) infinite set-up assuming bivariate normal distribution between variables...
Prediction of random effects is an important problem with expanding applications. In the simplest context, the problem corresponds to prediction of the latent value (the mean) of a realized cluster selected via two-stage sampling. Best linear unbiased predictors developed from mixed models are widely used, but their development requires distributional assumptions or an infinite population frame...
In the conventional data envelopment analysis (DEA) internal sub-processes of the production units are ignored. The current paper develops a network-DEA super-efficiency model to compare the performance of efficient network systems. A new ranking method is developed by aggregating the computed super-efficiency scores with a J-divergence measure. The proposed approach is then applied to evaluate...
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