135 research outputs found
MonoTrack: Shuttle trajectory reconstruction from monocular badminton video
Trajectory estimation is a fundamental component of racket sport analytics,
as the trajectory contains information not only about the winning and losing of
each point, but also how it was won or lost. In sports such as badminton,
players benefit from knowing the full 3D trajectory, as the height of
shuttlecock or ball provides valuable tactical information. Unfortunately, 3D
reconstruction is a notoriously hard problem, and standard trajectory
estimators can only track 2D pixel coordinates. In this work, we present the
first complete end-to-end system for the extraction and segmentation of 3D
shuttle trajectories from monocular badminton videos. Our system integrates
badminton domain knowledge such as court dimension, shot placement, physical
laws of motion, along with vision-based features such as player poses and
shuttle tracking. We find that significant engineering efforts and model
improvements are needed to make the overall system robust, and as a by-product
of our work, improve state-of-the-art results on court recognition, 2D
trajectory estimation, and hit recognition.Comment: To appear in CVSports@CVPR 202
Porocarcinoma in situ showing follicular differentiation: A case report
AbstractPoroid neoplasm is a skin appendage tumor that has both benign and malignant counterparts. It has traditionally been regarded as of eccrine origin and has four types: intraepidermal poroma (hidroacanthoma simplex), poroma, dermal duct tumor, and poroid hidradenoma. Here we describe the case of a 64-year-old woman who had a verrucous, erythematous to brownish tumor on her left buttock for many years. Histopathology revealed an intra-epidermal poroid tumor with both benign and malignant parts. The benign part had intra-epidermal nests of poroid cells, which were smaller, monomorphic and sharply marginated from adjacent keratinocytes. The malignant part showed similar cell types, but had a higher nuclear/cytoplasmic ratio, pleomorphism, and prominent mitoses. Ductal structures were noted in neoplastic cells and an epithelial membrane antigen stain was strongly positive. Interestingly, peripheral palisading and primitive follicular germ formation were also observed in the neoplasm, which suggests follicular differentiation. We made a final diagnosis of porocarcinoma in situ with follicular differentiation, which may support the folliculosebaceous–apocrine unit theory, but a tumor with such a combination has not been described before
R&D, Patent Arrangements, and Financial Performances: Evidence from Taiwan
In this study, we investigate the relationships among R&D, patent arrangements, and financial performances for the firms listed on the Taiwan Stock Exchange (TWSE). In particular, we apply Vector Autoregression (VAR) to examine the relationships of the listed firms classified as industries of Semiconductor, Computer and Peripheral Equipment, Optoelectronic, Communications and Internet, Electronic Parts & Components, Electronic Products Distribution, and Other Electronic, by the TWSE. In sum, we find the different lead-lag relationships among R&D, patent arrangements, and financial performances in different industries, indicating important insight into patent arrangements
VIRD: Immersive Match Video Analysis for High-Performance Badminton Coaching
Badminton is a fast-paced sport that requires a strategic combination of
spatial, temporal, and technical tactics. To gain a competitive edge at
high-level competitions, badminton professionals frequently analyze match
videos to gain insights and develop game strategies. However, the current
process for analyzing matches is time-consuming and relies heavily on manual
note-taking, due to the lack of automatic data collection and appropriate
visualization tools. As a result, there is a gap in effectively analyzing
matches and communicating insights among badminton coaches and players. This
work proposes an end-to-end immersive match analysis pipeline designed in close
collaboration with badminton professionals, including Olympic and national
coaches and players. We present VIRD, a VR Bird (i.e., shuttle) immersive
analysis tool, that supports interactive badminton game analysis in an
immersive environment based on 3D reconstructed game views of the match video.
We propose a top-down analytic workflow that allows users to seamlessly move
from a high-level match overview to a detailed game view of individual rallies
and shots, using situated 3D visualizations and video. We collect 3D spatial
and dynamic shot data and player poses with computer vision models and
visualize them in VR. Through immersive visualizations, coaches can
interactively analyze situated spatial data (player positions, poses, and shot
trajectories) with flexible viewpoints while navigating between shots and
rallies effectively with embodied interaction. We evaluated the usefulness of
VIRD with Olympic and national-level coaches and players in real matches.
Results show that immersive analytics supports effective badminton match
analysis with reduced context-switching costs and enhances spatial
understanding with a high sense of presence.Comment: To Appear in IEEE Transactions on Visualization and Computer Graphics
(IEEE VIS), 202
dbPTM: an information repository of protein post-translational modification
dbPTM is a database that compiles information on protein post-translational modifications (PTMs), such as the catalytic sites, solvent accessibility of amino acid residues, protein secondary and tertiary structures, protein domains and protein variations. The database includes all of the experimentally validated PTM sites from Swiss-Prot, PhosphoELM and O-GLYCBASE. Only a small fraction of Swiss-Prot proteins are annotated with experimentally verified PTM. Although the Swiss-Prot provides rich information about the PTM, other structural properties and functional information of proteins are also essential for elucidating protein mechanisms. The dbPTM systematically identifies three major types of protein PTM (phosphorylation, glycosylation and sulfation) sites against Swiss-Prot proteins by refining our previously developed prediction tool, KinasePhos (). Solvent accessibility and secondary structure of residues are also computationally predicted and are mapped to the PTM sites. The resource is now freely available at
Dichlorido{2-[2-(dimethylammonio)ethyliminomethyl]-6-methoxyphenolato}zinc(II)
The structure of the title complex, [ZnCl2(C12H18N2O2)], contains a zwitterionic Schiff base ligand. The complex adopts a distorted tetrahedral coordination geometry around the metal centre with the Schiff base ligand coordinated in a bidentate fashion via the imine N and phenolate O atoms. In the crystal, intermolecular N—H⋯O and C—H⋯Cl hydrogen bonds link the molecules into chains parallel to the c-glide planes
How does patent litigation influence dynamic risk for market competitors?
Many recent studies have discussed the appropriateness of various patent measurement indicators, as well as the differences in the positioning of patented technologies, while there is little discussion on the risk transmission of enterprises when faced with infringement litigation. This study used the bivariate EGARCH (Exponential Generalized Autoregressive Conditional Heteroskedasticity) model with DCC (Dynamic Conditional Correlations) to investigate the dynamic risk transmission of patent litigation between market competitors in the smartphone industry. Empirical results revealed that when facing lawsuits from market challengers, the market leader faces fewer risks when handling patent infringement litigations. In addition, the risk reactions of competitors during patent wars may widely differ. Investors should consider the patent infringement litigations when measuring the dynamic risks of share prices, and determining the optimal configuration of asset portfolios in response.
First published online: 03 Nov 201
Measurement of the Cotton-Mouton effect in nitrogen, oxygen, carbon dioxide, argon, and krypton with the Q & A apparatus
Experiments for vacuum birefringence and vacuum dichroism have been set up
with high-finesse high magnetic experimental apparatuses, which seem to be
ideal for small gaseous Cotton-Mouton effect (CME) measurements. PVLAS
Collaboration has measured CMEs in krypton, xenon and neon at the wavelength of
1064 nm. In this Letter, we report on our measurement of CMEs in nitrogen,
oxygen, carbon dioxide, argon, and krypton at the same wavelength in a magnetic
field B = 2.3 T at pressure P = 0.5-300 Torr and temperature T = 295-298 K. Our
results agree with the PVLAS results in the common cases.Comment: 8 pages, 2 tables, 5 figures, submitted to Chemical Physics Letters.
Some modifications are made in the revision according to the referee's
comments: Donotations in equations are unified. Error in quoting numbers in 2
places in Table 2 is corrected. Uncertainty in modulation depth is included
in the total systematic error. References are order re-arrange
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