1,522 research outputs found
The Suryong System as a Collectivist Developmental Strategy
Many Western studies, seeing North Korea through the prism framed by the Cold War, depicts it as one or some combination of three images: a satellite of the Soviet Union, a totalitarian regime, or a feudal dynasty. This paper argues in contrast that it is best to explain North Korea’s political institution centered around Suryong as a product of the collective choice to pursue the often contradictory dual goals of building a “socialist utopia” and achieving economic development. In pursuit of these goals, the Korean Workers’ Party (KWP) has adopted a collectivist developmental strategy that places a premium on collective efforts and non-material incentives. Several problems arose in the process of implementation, and particularly serious were the challenges of de-Stalinism from outside and dogmatism from within as well as individualism among the public. The KWP responded with political projects: to solidify the Party and strengthen its unity with the public while privileging ideological incentives over material rewards. The series of choices has led to the establishment of the Suryong system where Kim Il-Sung occupies the central position of power around which the Party and mass are organized. While the Suryong system faced particularly difficult challenges in the 1990s, Kim Jong-Il’s ‘Military-First Policies’ sought to institutionalize the system further by using the military to diffuse Suryong system’s normative values throughout the society. This paper concludes by considering some of the negative consequences that the pursuit of such a strategy has brought about
Early-type Host Galaxies of Type Ia Supernovae. I. Evidence for Downsizing
Type Ia supernova (SN Ia) cosmology provides the most direct evidence for the
presence of dark energy. This result is based on the assumption that the
look-back time evolution of SN Ia luminosity, after light-curve corrections,
would be negligible. Recent studies show, however, that the Hubble residual
(HR) of SN Ia is correlated with the mass and morphology of host galaxies,
implying the possible dependence of SN Ia luminosity on host galaxy properties.
In order to investigate this more directly, we have initiated spectroscopic
survey for the early-type host galaxies, for which population age and
metallicity can be more reliably determined from the absorption lines. As the
first paper of the series, here we present the results from high
signal-to-noise ratio (>100 per pixel) spectra for 27 nearby host galaxies in
the southern hemisphere. For the first time in host galaxy studies, we find a
significant (~3.9sigma) correlation between host galaxy mass (velocity
dispersion) and population age, which is consistent with the "downsizing" trend
among non-host early-type galaxies. This result is rather insensitive to the
choice of population synthesis models. Since we find no correlation with
metallicity, our result suggests that stellar population age is mainly
responsible for the relation between host mass and HR. If confirmed, this would
imply that the luminosity evolution plays a major role in the systematic
uncertainties of SN Ia cosmology.Comment: Accepted for publication in ApJ
Core collapse and horizontal-branch morphology in galactic globular clusters
Context. Stellar collision rates in globular clusters (GCs) do not appear to
correlate with horizontal branch (HB) morphology, sug- gesting that dynamics
does not play a role in the second-parameter problem. However, core densities
and collision rates derived from surface-brightness may be significantly
underestimated as the surface-brightness profile of GCs is not necessarily a
good indicator of the dynamical state of GC cores. Core-collapse may go
unnoticed if high central densities of dark remnants are present. Aims. We test
whether GC HB morphology data supports a dynamical contribution to the
so-called second-parameter effect. Methods. To remove first-parameter
dependence we fitted the maximum effective temperature along the HB as a
function of metal- licity in a sample of 54 Milky Way GCs. We plotted the
residuals to the fit as a function of second-parameter candidates, namely
dynamical age and total luminosity. We considered dynamical age (i.e. the ratio
between age and half-light relaxation time) among possible second-parameters.
We used a set of direct N-body simulations, including ones with dark remnants
to illustrate how core density peaks, due to core collapse, in a dynamical-age
range similar to that in which blue HBs are overabundant with respect to the
metallicity expectation, especially for low-concentration initial conditions.
Results. GC total luminosity shows nonlinear behavior compatible with the
self-enrichment picture. However, the data are amenable to a different
interpretation based on a dynamical origin of the second-parameter effect.
Enhanced mass-stripping in the late red-giant- branch phase due to stellar
interactions in collapsing cores is a viable candidate mechanism. In this
picture, GCs with HBs bluer than expected based on metallicity are those
undergoing core-collapse.Comment: 7 pages, 7 figures, A&A accepte
EFFECT OF BALLET-EXPERIENCE OF 12-YEAR-OLD FEMALE CHILDREN ON THE LEARNING OF DYNAMIC BALANCE CONTROL
The purpose of this study was to examine whether previous regular experience in ballet enhance the learning balance task on the balance testing board. Eighteen healthy female children aged twelve including eight with more than three years ballet-experience and eight without the ballet-experience participated. Dynamic balance learning consisting of 3 sessions, which were pre-training and post-training with practices, and retention with no practice, were performed on the balance testing board. The interval between each session was one week. The stability was measured while the subject performed balance task on the same balance testing board placed on an AMTI force platform. The stability was defined as the sum of center of pressure (COP) and center of body mass (COM) mono directional displacements; and the variance of the end tip of the balance board displacement in vertical direction. Two way ANOVA for repeated-measures (2 groups 3 sessions) revealed statistically significant increases in postural stability for the test immediately following training and the retention test in both groups. Although interaction effect indicated greater improvement in non-experienced group, the stability of the group with experience in ballet far exceeded that of the group without experience, about all the variables of each session. Our results suggest that experience in ballet up to being twelve year old have positive influence on the learning dynamic balance control task
Glossectomy in the severe maxillofacial vascular malformation with jaw deformity: a rare case report
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