3,033 research outputs found
Can Investors Profit from the Stock Recommendations on the Journalism? Testing Conditional Heteroscedasticity in the Market Model
[[abstract]]This study employs an event study using the market model with conditional heteroscedasticity to investigate the effects of media recommendations on the performance of electronics companies listed on the Taiwan Stock Market. The empirical results confirm that investors obtain significantly abnormal returns following different types of information around the announcement date when the news is released. These analytical results provide evidence that the stock market information is frequently leaked in advance of the announcement date and the investors generally adopt a conservative strategy following the release of information regarding a recommended stock.[[journaltype]]國外[[ispeerreviewed]]Y[[booktype]]電子版[[countrycodes]]SY
Estimation accuracy of high–low spread estimator
[[abstract]]In this paper we analyze the estimation accuracy of high–low spread estimator. It is found that the performance of high–low spread estimator depends on the size of the true spread, the level of transaction frequency, and the degree of volatility. Analyzing the probability of measurement error, it is shown that the high–low spread estimators have better performance when the size of the spread is even wider, when the level of transaction frequency is even higher, or when the degree of volatility is relatively lower.[[notice]]補正完畢[[incitationindex]]SSCI[[booktype]]紙本[[booktype]]電子
Systematic {\em ab initio} study of the phase diagram of epitaxially strained SrTiO
We use density-functional theory with the local-density approximation to
study the structural and ferroelectric properties of SrTiO under misfit
strains. Both the antiferrodistortive (AFD) and ferroelectric (FE)
instabilities are considered. The rotation of the oxygen octahedra and the
movement of the atoms are fully relaxed within the constraint of a fixed
in-plane lattice constant. We find a rich misfit strain-induced phase
transition sequence and is obtained only when the AFD distortion is taken into
account. We also find that compressive misfit strains induce ferroelectricity
in the tetragonal low temperature phase only whilst tensile strains induce
ferroelectricity in the orthorhombic phases only. The calculated FE
polarization for both the tetragonal and orthorhombic phases increases
monotonically with the magnitude of the strains. The AFD rotation angle of the
oxygen octahedra in the tetragonal phase increases dramatically as the misfit
strain goes from the tensile to compressive strain region whilst it decreases
slightly in the orthorhombic (FO4) phase. This reveals why the polarization in
the epitaxially strained SrTiO would be larger when the tensile strain is
applied, since the AFD distortion is found to reduce the FE instability and
even to completely suppress it in the small strain region. Finally, our
analysis of the average polar distortion and the charge density distribution
suggests that both the Ti-O and Sr-O layers contribute significantly to the FE
polarization
Use of Sand Compaction Piles for Improvement of a Coal Ash Pond
Effects of sand compaction piles on ground improvement of a coal ash pond and axial performance on four drilled shafts through improved coal ash layer at a power plant in southern Taiwan is studied in this paper. Effects of the sand compaction piles improvement is evaluated by comparing the SPT-N values before and after ground improvement. The load versus displacement relation at head, the axial force along the shaft, the t-z curves and/or the toe q-z curve, which are the main concerns of shaft load test results, are presented and discussed in the paper
Life-style orientation and contents of websites in personas industry
Electronic commerce challenges personas companies to design electronic system to increase interaction which leads to retain customers and increase sales. This exploratory study examines the correlation between lifestyle and emphasis on contents of website in personas industry. The study finds that market segment of lifestyle can be divided into four groups: ‘opinion leader’, ‘opinion follower’, ‘conservative’ and ‘challenger’. This paper tries to suggest a checklist to a vendor. We conclude that AIO can be a base of market segment in personas industry. We suggest some important factors which are included of the customized services, the safety of use factors, the store information and the menu illustration. Finally, we also conclude that the first three important factors of websites have significant influences on market segments of personas industry except for the store information factor.AIO, market segmentation, personas industry.
Computation-Performance Optimization of Convolutional Neural Networks with Redundant Kernel Removal
Deep Convolutional Neural Networks (CNNs) are widely employed in modern
computer vision algorithms, where the input image is convolved iteratively by
many kernels to extract the knowledge behind it. However, with the depth of
convolutional layers getting deeper and deeper in recent years, the enormous
computational complexity makes it difficult to be deployed on embedded systems
with limited hardware resources. In this paper, we propose two
computation-performance optimization methods to reduce the redundant
convolution kernels of a CNN with performance and architecture constraints, and
apply it to a network for super resolution (SR). Using PSNR drop compared to
the original network as the performance criterion, our method can get the
optimal PSNR under a certain computation budget constraint. On the other hand,
our method is also capable of minimizing the computation required under a given
PSNR drop.Comment: This paper was accepted by 2018 The International Symposium on
Circuits and Systems (ISCAS
Can Investors Profit from the Stock Recommendations on? the Journalism? Testing Conditional Heteroscedasticity in the Market Model
[[abstract]]This study employs an event study using the market model with conditional
heteroscedasticity to investigate the effects of media recommendations on the performance
of electronics companies listed on the Taiwan Stock Market. The empirical results confirm
that investors obtain significantly abnormal returns following different types of information
around the announcement date when the news is released. These analytical results provide
evidence that the stock market information is frequently leaked in advance of the
announcement date and the investors generally adopt a conservative strategy following the
release of information regarding a recommended stock
Re-entrant Fulde-Ferrell-Larkin-Ovchinnikov State in Small-Sized Superconductors
We study the effect of a parallel magnetic field in a thin and small
superconductor. The field suppresses superconductivity through Zeeman coupling
while stabilizes the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state at high
fields before superconductivity is destroyed. When the spatial period of FFLO
state is comparable to the size of the superconductor, there is a strong
commensuration effect, which modifies the superconducting phase diagram. We
investigate the FFLO state and the phase diagram in the presence of strong
commensuration effect both for the -wave and -wave superconductors using
the Bogoliubov de Gennes equation, Green function approach, and Ginzburg-Landau
theory. We found that the superconducting phase diagram is strongly modulated.
Interestingly, there is re-entrance of superconductivity upon increasing the
magnetic field. The commensuration effect of the FFLO state can be used to
detect the FFLO state in experiments.Comment: 10 pages, 5 figure
- …