نتایج جستجو برای: خوشهبندی som

تعداد نتایج: 8769  

2006
Yonggang Liu Robert H. Weisberg Christopher N. K. Mooers

[1] Despite its wide applications as a tool for feature extraction, the Self-Organizing Map (SOM) remains a black box to most meteorologists and oceanographers. This paper evaluates the feature extraction performance of the SOM by using artificial data representative of known patterns. The SOM is shown to extract the patterns of a linear progressive sine wave. Sensitivity studies are performed ...

Journal: :The Journal of neuroscience : the official journal of the Society for Neuroscience 1996
F Viana B Hille

We investigated actions of somatostatin (Som) on voltagegated calcium channels in acutely isolated rat amygdaloid neurons. Somatostatin caused a dose-dependent inhibition of the high voltage-activated (HVA) Ca2+ current, with little or no effect on the low voltage-activated (LVA) current. Nifedipine (2-10 microM) reduced the peak current by approximately 15% without reducing inhibition of curre...

2007
James Hammerton

2006
Edward G. Gregorich

Extraction of soil organic matter (SOM) fractions has been a longstanding approach to elucidating the pivotal roles of SOM in soil processes. Several types of extraction procedures are commonly used, and all provide partial information on SOM function. This report and accompanying papers summarize the information regarding SOM functions in real-world issues that has been gained through physical...

2002
Gustavo Arroyave Oscar Ortega Lobo Andrés Marín

With the increase of computer usage, the number of digital documents is reaching values that make unviable conducting the tasks of text organization by humans. There is a demand for text organization tools that can operate with little human intervention and that can display the results of the organization in the most commonly used visual interface: the two-dimensional (2D) plane. One of the tec...

2015
Cristina Vasuta Julien Artinian Isabel Laplante Sarah Hébert-Seropian Karim Elayoubi Jean-Claude Lacaille

Cortical GABAergic interneurons represent a highly diverse neuronal type that regulates neural network activity. In particular, interneurons in the hippocampal CA1 oriens/alveus (O/A-INs) area provide feedback dendritic inhibition to local pyramidal cells and express somatostatin (SOM). Under relevant afferent stimulation patterns, they undergo long-term potentiation (LTP) of their excitatory s...

Journal: :Environmental science & technology 2015
Yingjun Liu Mikinori Kuwata Benjamin F Strick Franz M Geiger Regan J Thomson Karena A McKinney Scot T Martin

The oxidation of isoprene is a globally significant source of secondary organic material (SOM) of atmospheric particles. The relative importance of different parallel pathways, however, remains inadequately understood and quantified. SOM production from isoprene photooxidation was studied under hydroperoxyl-dominant conditions for <5% relative humidity and at 20 °C in the presence of highly aci...

Journal: :Environmental monitoring and assessment 2017
S E Obalum G U Chibuike S Peth Y Ouyang

Soil organic matter (SOM) is known to play vital roles in the maintenance and improvement of many soil properties and processes. These roles, which largely influence soil functions, are a pool of specific contributions of different components of SOM. The soil functions, in turn, normally define the level of soil degradation, viewed as quantifiable temporal changes in a soil that impairs its qua...

2009
Kristina Lagerstedt

1 ABSTRACT Colorectal tumors are responsible for more than 600 000 deaths per year worldwide and thereby constitute the second most common cause of cancer related mortality. Early detection is related to improved prognosis and identification of genetic biomarkers would meliorate available diagnostic tools. Existing tumor classification systems lack precise monitoring within individual tumor sta...

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