scholarly journals Classification of Population II Stars in the RGU System

1973 ◽  
Vol 50 ◽  
pp. 226-229
Author(s):  
U. W. Steinlin
Keyword(s):  
Globular Cluster ◽  
Metal Content ◽  
Galactic Halo ◽  
Theoretical Treatment ◽  
System A

The theoretical treatment of the blanketing effect and the first photometric results had shown that the separation of stars of different metal content should be better in the RGU system than in the UBV system. A three color photometry of the globular cluster M5 is undertaken to show the position of these stars in the RGU two-color diagram, to derive the conversion formulae between the two photometric systems for these stars and to use the results for the classification of population II field stars in statistical investigations of the galactic halo.

scholarly journals Stabilizing interventional instruments in the cardiovascular system: A classification of mechanisms

2021 ◽  
Vol 89 ◽  
pp. 22-32
Author(s):  
Awaz Ali ◽  
Dimitra Dodou ◽  
Gerwin Smit ◽  
Ruben Rink ◽  
Paul Breedveld
Keyword(s):  
Cardiovascular System ◽  
System A

Classification of EEG Mental Patterns by Using Two Scalp Electrodes and Mahalanobis Distance-Based Classifiers

2002 ◽  
Vol 41 (04) ◽  
pp. 337-341 ◽  
Author(s):  
F. Cincotti ◽  
D. Mattia ◽  
C. Babiloni ◽  
F. Carducci ◽  
L. Bianchi ◽  
...  
Keyword(s):  
Mahalanobis Distance ◽  
Brain Computer Interface ◽  
Computer Interface ◽  
Correct Classification ◽  
Interface Area ◽  
System A ◽  
The Brain ◽  
Full Covariance Matrix ◽  
Recording Electrodes

Summary Objectives: In this paper, we explored the use of quadratic classifiers based on Mahalanobis distance to detect mental EEG patterns from a reduced set of scalp recording electrodes. Methods: Electrodes are placed in scalp centro-parietal zones (C3, P3, C4 and P4 positions of the international 10-20 system). A Mahalanobis distance classifier based on the use of full covariance matrix was used. Results: The quadratic classifier was able to detect EEG activity related to imagination of movement with an affordable accuracy (97% correct classification, on average) by using only C3 and C4 electrodes. Conclusions: Such a result is interesting for the use of Mahalanobis-based classifiers in the brain computer interface area.

scholarly journals The metal content of the bulge globular cluster NGC 6528

2004 ◽  
Vol 423 (2) ◽  
pp. 507-516 ◽  
Author(s):  
M. Zoccali ◽  
B. Barbuy ◽  
V. Hill ◽  
S. Ortolani ◽  
A. Renzini ◽  
...  
Keyword(s):  
Globular Cluster ◽  
Metal Content

scholarly journals A Computational Strategy for Classification of Enem Issues Based on Item Response Theory

2020 ◽  
Vol 27 (1) ◽  
pp. 92-111
Author(s):  
Gustavo Henrique Nunes ◽  
Bruno Alberto Soares Oliveira ◽  
Ciniro Aparecido Leite Nametala
Keyword(s):  
High School ◽  
Item Response Theory ◽  
Item Response ◽  
Generation System ◽  
Response Theory ◽  
Hit Rate ◽  
System A ◽  
Intelligent Simulation ◽  
Computational Strategy

The National High School Examination (ENEM) gains each year more importance, as it gradually, replacing traditional vestibular. Many simulations are done almost randomly by teachers or systems, with questions chosen without discretion. With this methodology, if a test needs to be reapplied, it is not possible to recreate it with questions that have the same difficulty as those used in the first evaluation. In this context, the present work presents the development of an ENEM Intelligent Simulation Generation System that calculates the parameters of Item Response Theory (TRI) of questions that have already been applied in ENEM and, based on them, classifies them. in groups of difficulty, thus enabling the generation of balanced tests. For this, the K-means algorithm was used to group the questions into three difficulty groups: easy, medium and difficult. To verify the functioning of the system, a simulation with 180 questions was generated along the ENEM model. It could be seen that in 37.7% of cases this happened. This hit rate was not greater because the algorithm confounded the difficulty of issues that are in close classes. However, the system has a hit rate of 92.8% in the classification of questions that are in distant groups.

IMPACT OF CLIMATE CHANGE ON THE GROWTH RATE OF CARDIOVASCULAR DISEASES IN THE LENINGRAD REGION

2021 ◽  
pp. 99-112
Author(s):  
M. V. Klyueva ◽  
◽  
I. M. Shkol’nik ◽  
Yu. L. Rudakova ◽  
T. V. Pavlova ◽  
...  
Keyword(s):  
Climate Change ◽  
Growth Rate ◽  
Cardiovascular Diseases ◽  
Heat Waves ◽  
Climatic Conditions ◽  
Leningrad Region ◽  
System A ◽  
Return Levels ◽  
Main Geophysical Observatory

Return levels of the major climatic stressors affecting the level of morbidity and mortality from cardiovascular diseases in the Leningrad region are evaluated. Based on data from 26 ob-serving stations located in 18 municipal units, a cluster analysis has been carried out allowing for classification of the territory according to the degree of influence of climatic conditions on the pathology of cardiovascular system. A projection of future changes in the selected climate indica-tors for the mid and end of the XXI century is conducted. The projection is based on the ensem-ble of climate change simulations using the Voeikov Main Geophysical Observatory regional cli-mate model under the IPCC RCP8.5 scenario. It has been shown that the main future threats due to the changing climate are associated with an increase in mortality from cardiovascular diseases connected with the projected increase in the intensity of the heat waves. The relevancy to take into account climate warming when it comes to developing a strategy for combating cardiovascu-lar diseases in municipal units is emphasized.

A Few Advantages of Economic Democracy

2011 ◽  
pp. 5-29
Author(s):  
Bruno Jossa
Keyword(s):  
Public Good ◽  
Social Evolution ◽  
Labour Productivity ◽  
State Intervention ◽  
Economic Democracy ◽  
System A ◽  
Merit Goods ◽  
Political Economic

The aim of this article is to discuss some of the main advantages of an employeemanaged system: a labour productivity edge on capitalistic businesses, the suppression of external firm control, slower monopoly-building and softer competition, the eclipse of the paramount role of economics in social evolution and a reduced need for state intervention into the economy. The author's analysis sheds light on whether, and in what sense, economic democracy is a public good proper or just a "merit good". From the classification of cooperative as merit goods it follows that any government, regardless of political-economic orientation, should make it its task to support the growth of the democratic firm system by enforcing tax or credit benefits in its favour.

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