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Search Results: 1 - 10 of 27600 matches for " Robert Lyle "
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The Personalized System of Instruction: Review and Applications to Distance Education
Lyle Grant,Robert E. Spencer
International Review of Research in Open and Distance Learning , 2003,
Abstract: The present paper a) outlines the basic features of the Personalized System of Instruction (PSI); b) provides a brief history of PSI; and c) describes the application of PSI to distance education. Some common misconceptions about PSI are also addressed. PSI is presented as a helpful universally applicable set of instructional practices that are well suited to distance teaching and learning.
Effect of Terrestrial LiDAR Point Sampling Density in Ephemeral Gully Characterization  [PDF]
Henrique G. Momm, Ronald L. Bingner, Robert R. Wells, Seth M. Dabney, Lyle D. Frees
Open Journal of Modern Hydrology (OJMH) , 2013, DOI: 10.4236/ojmh.2013.31006

Gully erosion can account for significant volumes of sediment exiting agricultural landscapes, but is difficult to monitor and quantify its evolution with traditional surveying technology. Scientific investigations of gullies depend on accurate and detailed topographic information to understand and evaluate the complex interactions between field topography and gully evolution. Detailed terrain representations can be produced by new technologies such as terrestrial LiDAR systems. These systems are capable of collecting information with a wide range of ground point sampling densities as a result of operator controlled factors. Increasing point density results in richer datasets at a cost of increased time needed to complete field surveys. In large research watersheds, with hundreds of sites being monitored, data collection can become costly and time consuming. In this study, the effect of point sampling density on the capability to collect topographic information was investigated at individual gully scale. This was performed through the utilization of semi-variograms to produce overall guiding principles for multi-temporal gully surveys based on various levels of laser sampling points and relief variation (low, moderate, and high). Results indicated the existence of a point sampling density threshold that produces little or no additional topographic information when exceeded. A reduced dataset was created using the density thresholds and compared to the original dataset with no major discrepancy. Although variations in relief and soil roughness can lead to different point sampling density requirements, the outcome of this study serves as practical guidance for future field surveys of gully evolution and erosion.

MIPHENO: data normalization for high throughput metabolite analysis
Shannon M Bell, Lyle D Burgoon, Robert L Last
BMC Bioinformatics , 2012, DOI: 10.1186/1471-2105-13-10
Abstract: Here we describe MIPHENO (Mutant Identification by Probabilistic High throughput-Enabled Normalization), an approach for post-hoc normalization of quantitative first-pass screening data in the absence of explicit in-group controls. This approach includes a quality control step and facilitates cross-experiment comparisons that decrease the false non-discovery rates, while maintaining the high accuracy needed to limit false positives in first-pass screening. Results from simulation show an improvement in both accuracy and false non-discovery rate over a range of population parameters (p < 2.2 × 10-16) and a modest but significant (p < 2.2 × 10-16) improvement in area under the receiver operator characteristic curve of 0.955 for MIPHENO vs 0.923 for a group-based statistic (z-score). Analysis of the high throughput phenotypic data from the Arabidopsis Chloroplast 2010 Project (http://www.plastid.msu.edu/ webcite) showed ~ 4-fold increase in the ability to detect previously described or expected phenotypes over the group based statistic.Results demonstrate MIPHENO offers substantial benefit in improving the ability to detect putative mutant phenotypes from post-hoc analysis of large data sets. Additionally, it facilitates data interpretation and permits cross-dataset comparison where group-based controls are missing. MIPHENO is applicable to a wide range of high throughput screenings and the code is freely available as Additional file 1 as well as through an R package in CRAN.High-throughput screening studies in biology and other fields are increasingly popular due to ease of sample tracking and decreasing technology costs. These experimental setups enable researchers to obtain numerous measurements across multiple individuals in parallel (e.g. gene expression and diverse plate-based assays) or in series (e.g. metabolomics and proteomics platforms). The large number of measurements collected often comes at the cost of measurement precision or the overall power of detect
A Risk Ratio Comparison of $l_0$ and $l_1$ Penalized Regression
Kory D. Johnson,Dongyu Lin,Lyle H. Ungar,Dean P. Foster,Robert A. Stine
Statistics , 2015,
Abstract: There has been an explosion of interest in using $l_1$-regularization in place of $l_0$-regularization for feature selection. We present theoretical results showing that while $l_1$-penalized linear regression never outperforms $l_0$-regularization by more than a constant factor, in some cases using an $l_1$ penalty is infinitely worse than using an $l_0$ penalty. We also show that the "optimal" $l_1$ solutions are often inferior to $l_0$ solutions found using stepwise regression. We also compare algorithms for solving these two problems and show that although solutions can be found efficiently for the $l_1$ problem, the "optimal" $l_1$ solutions are often inferior to $l_0$ solutions found using greedy classic stepwise regression. Furthermore, we show that solutions obtained by solving the convex $l_1$ problem can be improved by selecting the best of the $l_1$ models (for different regularization penalties) by using an $l_0$ criterion. In other words, an approximate solution to the right problem can be better than the exact solution to the wrong problem.
Epidemic Intelligence. Langmuir and the Birth of Disease Surveillance
Lyle Fearnley
Behemoth : a Journal on Civilisation , 2010,
Abstract: In the wake of the SARS and influenza epidemics of the past decade, one public health solution has become a refrain: surveillance systems for detection of disease outbreaks. This paper is an effort to understand how disease surveillance for outbreak detection gained such paramount rationality in contemporary public health. The epidemiologist Alexander Langmuir is well known as the creator of modern disease surveillance. But less well known is how he imagined disease surveillance as one part of what he called “epidemic intelligence.” Langmuir developed the practice of disease surveillance during an unprecedented moment in which the threat of biological warfare brought civil defense experts and epidemiologists together around a common problem. In this paper, I describe how Langmuir navigated this world, experimenting with new techniques and rationales of epidemic control. Ultimately, I argue, Langmuir′s experiments resulted in a set of techniques and infrastructures – a system of epidemic intelligence – that transformed the epidemic as an object of human art.
Narrative Form and the Structure of Myth
Emily Lyle
Folklore : Electronic Journal of Folklore , 2006,
Abstract: At each stage in transmission of a tale from generation to generation, modifications take place but something remains. Thus there is a potential for material to be retained from a time in the distant past when the narrative was embedded in a total oral worldview or cosmology. This article introduces the analogical discovery method and uses it to build up a structure based on a group of tales from Greece , Ireland and Wales. It draws the conc lusion that the structure of myth that is indirectly discernible through them deals with four generations, both of gods and of humans, the last of which contains the king. It agrees with the view proposed by Georges Dumézil that myth reflects human social organisation and argues in addition that matrilineal succession to kingship provides a good fit with the tales. The suggestion is put forward that there was a total, quite complex, cosmological code of which narratives retain traces and that scholars today have the opportunity of decipheringit.
Vaenulike kaksikute positsioon etteantud teogoonilises struktuuris
Emily Lyle
M?etagused. Hüperajakiri , 2002,
Abstract: Comparative mythology needs to consider two parallel pairs of twins. One is the pair of antagonistic twins, the other the Ashvin pair of twins found in the Vedas. Often they are treated only as simply a pair, the personification of fertility and prosperity. One of them is the cattle-breeder-twin and the other horseman-twin. In Roman mythology, the Ashvin twins are Castor and Pollux; in the Jewish legend, Esav and Jacob. The topic of the first birth of the twins is more clearly treated in the versions of the antagonistic twins. E.g. the zervanistic god of light Ohrmazd and god of darkness Ahriman; in Roman mythology, Romulus and Remus. Characteristic of the story of the antagonistic twins is the argument over which will become the ruler, i.e. they are royal twins and their royal descent is as important in their identification as their antagonism. Thus, the theogony peaking with the birth of the antagonistic twins is only applicable in a society ruled by a king.
Mis on rituaalne aasta? Küsimus ja vastused
Emily Lyle
M?etagused. Hüperajakiri , 2006,
Abstract: The author asks the question concerning the nature and identity of the ritual year. Other supplementary questions that can be asked are whether it is actually possible to locate an underlying coherence at all and, if so, what historical and geographical contexts would embrace it most fully. The author also inquires why there is no recognised current theory about the ritual year. In her approach she emphasises analogical thinking and takes the human life cycle as a key to the understanding of the patterning of the year. In the analysis, four levels are considered: whole eras or time itself at the large scale and with seconds or less at the small scale are dealt with, and the basic series of analogies has the human life cycle as the largest in scale and works down through the year and the month to the 24-hour day as the smallest. Thus, a reference set is established in which two tasks have to be considered: the first is to become familiar with the patterning of examples of the overall cyclical sequence, and the second is to categorise the divisions the cycle. The author has developed Tolstoy’s observation concerning “the isomorphism of the periods after midnight in the diurnal circle and after Christmas in the year circle” and also the idea that Dumézil’s triad of functions of physical force, prosperity and the sacred relates more fundamentally to the life stages of young men, mature men and old men than to the social groups he mentions of warriors, cultivators and priests.
Some $q$-analogues of the Certer-Payne theorem
Sinead Lyle
Mathematics , 2006,
Abstract: We prove a $q$-analogue of the Carter-Payne theorem for the two special cases corresponding to moving an arbitrary number of nodes between adjacent rows, or moving one node between an arbitrary number of rows. As a consequence, we show that these homomorphism spaces are one dimensional when $q \neq -1$. We apply these results to complete the classification of the reducible Specht modules for the Hecke algebras of the symmetric groups when $q \neq-1$. Our methods can also be used to determine certain other pairs of Specht modules between which there is a homomorphism. In particular, we describe the homomorphism space from the trivial module to an arbitrary Specht module.
Large dimensional homomorphism spaces between Weyl modules and Specht modules
Sinead Lyle
Mathematics , 2011,
Abstract: We give a family of pairs of Weyl modules for which the corresponding homomorphism space is at least 2-dimensional. Using this result we show that for fixed parameters $e>0$ and $p\geq 0$ there exist arbitrarily large homomorphism spaces between pairs of Weyl modules.
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