نتایج جستجو برای: a cluster sampling
تعداد نتایج: 13494356 فیلتر نتایج به سال:
We present preliminary results from two deep HRI ROSAT exposures on the Sculp-toris open cluster. This cluster, younger than the Pleiades, has photometric indicators that seem to imply a metal-poor cluster. On the contrary detailed analysis of high resolution spectroscopic observations results in a metal abundance higher than the solar value. Furthermore many cluster members show chromospheric ...
the purpose of this study was to examine the status of supervision on departments’ heads at ferdowsi university of mashhad (fum) and realize some applied themes to provide a fit model for supervising departments’ heads in fum. the method was case study under a research category aimed for applied one. using purposive sampling, interviews were conducted with top fum managers, head departments, an...
in recent years, there has been a growing interest among researchers to investigate the relationship betweenteacher self-efficacy and classroom behavior management, especially students misbehavior. therefore, this study aimed to comparatively investigate english and arabic teachers’ use of different behavior managementstrategies, their self-efficacy, and their success in an iranian context. th...
There has been increasing interest in diatom-based bio-assessment but we still lack a comprehensive understanding of how to capture diatoms' temporal dynamics with an appropriate sampling frequency (ASF). To cover this research gap, we collected and analyzed daily riverine diatom samples over a 1-year period (25 April 2013-30 April 2014) at the outlet of a German lowland river. The samples were...
BACKGROUND Measuring vaccination coverage permits evaluation and appropriate targeting of vaccination services. The cluster survey methodology developed by the World Health Organization, known as the 'Expanded Program on Immunization (EPI) methodology', has been used worldwide to assess vaccination coverage; however, the manner in which households are selected has been criticized by survey stat...
Molecular dynamics (MD) simulations offer a way to explore the conformational state space of large, biologically relevant molecules. Our sampling method, called “concurrent adaptive sampling” (CAS), utilizes MD simulations by letting a number of “walkers” adaptively explore the state space in consecutive steps. Walkers start in one conformational state, execute a short MD simulation and thus en...
For classification problem, the training data will significantly influence the classification accuracy. When the data set is highly unbalanced, classification algorithms tend to degenerate by assigning all cases to the most common outcome. Hence, it is important to select the suitable training data for classification in the imbalanced class distribution problem. In this paper, we propose cluste...
Recently, we developed a method (Amadei et al., J. Biomol. Str. Dyn. 13: 615-626; de Groot et al., J. Biomol. Str. Dyn. 13: 741-751, 1996) to obtain an extended sampling of the configurational space of proteins, using an adapted form of molecular dynamics (MD) simulations, based on the essential dynamics (ED) (Amadei et al., Proteins 17:412-425, 1993) method. In the present study, this ED sampl...
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