1,460 research outputs found
The effect of a market factor on information flow between stocks using minimal spanning tree
We empirically investigated the effects of market factors on the information
flow created from N(N-1)/2 linkage relationships among stocks. We also examined
the possibility of employing the minimal spanning tree (MST) method, which is
capable of reducing the number of links to N-1. We determined that market
factors carry important information value regarding information flow among
stocks. Moreover, the information flow among stocks evidenced time-varying
properties according to the changes in market status. In particular, we noted
that the information flow increased dramatically during periods of market
crises. Finally, we confirmed, via the MST method, that the information flow
among stocks could be assessed effectively with the reduced linkage
relationships among all links between stocks from the perspective of the
overall market
Multiple gravity laws for human mobility within cities
The gravity model of human mobility has successfully described the deterrence
of travels with distance in urban mobility patterns. While a broad spectrum of
deterrence was found across different cities, yet it is not empirically clear
if movement patterns in a single city could also have a spectrum of distance
exponents denoting a varying deterrence depending on the origin and destination
regions in the city. By analyzing the travel data in the twelve most populated
cities of the United States of America, we empirically find that the distance
exponent governing the deterrence of travels significantly varies within a city
depending on the traffic volumes of the origin and destination regions. Despite
the diverse traffic landscape of the cities analyzed, a common pattern is
observed for the distance exponents; the exponent value tends to be higher
between regions with larger traffic volumes, while it tends to be lower between
regions with smaller traffic volumes. This indicates that our method indeed
reveals the hidden diversity of gravity laws that would be overlooked
otherwise.Comment: 17 pages, 6 figure
COMPARISON OF PROPRIOCEPTION PERCEPTION TEST BETWEEN GOLFER AND NON-GOLFER USING TILTING PLATFORM
The purpose of this study was to test proprioception perception and compare between collegiate golfers and non-golfers using tilting platform. Sixteen male and fourteen female golfers and fifteen male and thirteen non-golfers were participated. All participants were performed perception test on the tilting platform. Frequency analysis and independent t-test were performed using SPSS 24.0. Alpha set at .05. Most participants were perceived from 1° to 2° of slopes and perceived left-right (target direction) slope than forward-backward slope. Repeated practice such as walking on the uneven ground or standing on sloped ground might help to improve proprioception perception. Further research using a tilting platform will be to develop the training program
Methanoldinitrato[N-(2-pyridylmethylene)aniline]copper(II)
The Cu atom in the title compound, [Cu(NO3)2(C12H10N2)(CH3OH)], adopts a square-pyramidal geometry, being ligated by two N atoms of the bidentate N-(2-pyridylmethylene)aniline (ppma) ligand, two O atoms of NO3 ligands and one O atom of a methanol molecule, which occupies the apical position. The phenyl ring on the ppma ligand is twisted out of the pyridine plane, forming a dihedral angle of 42.9 (1)°. In the crystal, intermolecular O—H⋯O hydrogen bonds between methanol and NO3 ligands form an extensive one-dimensional network extending parallel to [100]
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