10,285 research outputs found
Corporate Social Responsibility and Corporate Financial Performance: Evidence from Korea
This paper studies the empirical relation between corporate social responsibility (CSR) and corporate financial performance in Korea using a sample of 1122 firm-years during 2002-2008. We measure corporate social responsibility by both an equal-weighted CSR index and a stakeholder-weighted CSR index suggested by Akpinar et al. (2008). Corporate financial performance is measured by ROE, ROA and Tobin’s Q. We find a positive and significant relation between corporate financial performance and the stakeholder-weighted CSR index, but not the equal-weighted CSR index. This finding is robust to alternative model specifications and several additional tests, providing evidence in support of instrumental stakeholder theory.corporate social responsibility; corporate financial performance; KEJI index; instrumental stakeholder theory
Balanced Spherical Grid for Egocentric View Synthesis
We present EgoNeRF, a practical solution to reconstruct large-scale
real-world environments for VR assets. Given a few seconds of casually captured
360 video, EgoNeRF can efficiently build neural radiance fields which enable
high-quality rendering from novel viewpoints. Motivated by the recent
acceleration of NeRF using feature grids, we adopt spherical coordinate instead
of conventional Cartesian coordinate. Cartesian feature grid is inefficient to
represent large-scale unbounded scenes because it has a spatially uniform
resolution, regardless of distance from viewers. The spherical parameterization
better aligns with the rays of egocentric images, and yet enables factorization
for performance enhancement. However, the na\"ive spherical grid suffers from
irregularities at two poles, and also cannot represent unbounded scenes. To
avoid singularities near poles, we combine two balanced grids, which results in
a quasi-uniform angular grid. We also partition the radial grid exponentially
and place an environment map at infinity to represent unbounded scenes.
Furthermore, with our resampling technique for grid-based methods, we can
increase the number of valid samples to train NeRF volume. We extensively
evaluate our method in our newly introduced synthetic and real-world egocentric
360 video datasets, and it consistently achieves state-of-the-art performance.Comment: Accepted to CVPR 202
Angle Dependence of Landau Level Spectrum in Twisted Bilayer Graphene
In the context of the low energy effective theory, the exact Landau level
spectrum of quasiparticles in twisted bilayer graphene with small twist angle
is analytically obtained by spheroidal eigenvalues. We analyze the dependence
of the Landau levels on the twist angle to find the points, where the two-fold
degeneracy for twist angles is lifted in the nonzero modes and below/above
which massive/massless fermion pictures become valid. In the perpendicular
magnetic field of 10\,T, the degeneracy is removed at %angles around 3 degrees for a few low levels, specifically,
for the first pair of nonzero levels and
for the next pair. Massive quasiparticle
appears at in 10\,T, %angles less
than 1.17 degrees. which match perfectly with the recent experimental results.
Since our analysis is applicable to the cases of arbitrary constant magnetic
fields, we make predictions for the same experiment performed in arbitrary
constant magnetic fields, e.g., for B=40\,T we get and the sequence of angles for the pairs of nonzero energy levels. The symmetry restoration
mechanism behind the massive/massless transition is conjectured to be a
tunneling (instanton) in momentum space.Comment: 8 pages, 7 figures, version to appear in PR
Effects of reverse waves on the hydrodynamic pressure acting on a dual porous horizontal plate
ABSTRACTThe seaward reverse wave, occurring on the submerged dual porous horizontal plate, can contribute to the reduction of the transmitted wave as it reflects the propagating wave. However, the collision between the propagating and seaward reverse waves increases the water level and acts as a weight on the horizontal plate. This study investigated the characteristics of the wave pressure created by the seaward reverse wave through the analysis of experimental data. The analysis confirmed the following results: 1) the time series of the wave pressure showed reverse phase phenomena due to the collision, and the wave pressures acted simultaneously on both upper and lower surfaces of the horizontal plate; 2) the horizontal plate became repeatedly compressed and tensile before and after the occurrence of the seaward reverse wave; and 3) the seaward reverse wave created the total wave pressure to the maximum towards the direction of gravity, primarily on the upper plate. It was also confirmed that the wave distributions showed a similar trend to the wave steepness. Such outcome of the analysis will provide basic information to the structural analysis of the horizontal plate as a wave dissipater of the steel-type breakwater (STB)
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