4,208 research outputs found
Prediction-error of Prediction Error (PPE)-based Reversible Data Hiding
This paper presents a novel reversible data hiding (RDH) algorithm for
gray-scaled images, in which the prediction-error of prediction error (PPE) of
a pixel is used to carry the secret data. In the proposed method, the pixels to
be embedded are firstly predicted with their neighboring pixels to obtain the
corresponding prediction errors (PEs). Then, by exploiting the PEs of the
neighboring pixels, the prediction of the PEs of the pixels can be determined.
And, a sorting technique based on the local complexity of a pixel is used to
collect the PPEs to generate an ordered PPE sequence so that, smaller PPEs will
be processed first for data embedding. By reversibly shifting the PPE histogram
(PPEH) with optimized parameters, the pixels corresponding to the altered PPEH
bins can be finally modified to carry the secret data. Experimental results
have implied that the proposed method can benefit from the prediction procedure
of the PEs, sorting technique as well as parameters selection, and therefore
outperform some state-of-the-art works in terms of payload-distortion
performance when applied to different images.Comment: There has no technical difference to previous versions, but rather
some minor word corrections. A 2-page summary of this paper was accepted by
ACM IH&MMSec'16 "Ongoing work session". My homepage: hzwu.github.i
Advanced Volleyball Stats for All Levels: Automatic Setting Tactic Detection and Classification with a Single Camera
This paper presents PathFinder and PathFinderPlus, two novel end-to-end
computer vision frameworks designed specifically for advanced setting strategy
classification in volleyball matches from a single camera view. Our frameworks
combine setting ball trajectory recognition with a novel set trajectory
classifier to generate comprehensive and advanced statistical data. This
approach offers a fresh perspective for in-game analysis and surpasses the
current level of granularity in volleyball statistics. In comparison to
existing methods used in our baseline PathFinder framework, our proposed ball
trajectory detection methodology in PathFinderPlus exhibits superior
performance for classifying setting tactics under various game conditions. This
robustness is particularly advantageous in handling complex game situations and
accommodating different camera angles. Additionally, our study introduces an
innovative algorithm for automatic identification of the opposing team's
right-side (opposite) hitter's current row (front or back) during gameplay,
providing critical insights for tactical analysis. The successful demonstration
of our single-camera system's feasibility and benefits makes high-level
technical analysis accessible to volleyball enthusiasts of all skill levels and
resource availability. Furthermore, the computational efficiency of our system
allows for real-time deployment, enabling in-game strategy analysis and
on-the-spot gameplan adjustments.Comment: ICDM workshop 202
The role and possible molecular mechanism of valproic acid in the growth of MCF-7 breast cancer cells
Aim To investigate the role of valproic acid (VPA), a class I
selective histone deacetylase inhibitor, on Michigan Cancer
Foundation (MCF)-7 breast cancer cells, named and explore
its possible molecular mechanism.
Methods MCF-7 cells were cultured with sodium valproate
(0. 5-4.0 mmol/L) for 24 h, 48 h, and 72 h in vitro, respectively.
The cell viability, apoptosis, and cell cycle were examined.
The activities and protein expressions of caspase-3,
caspase-8, and caspase-9 were subsequently assayed. Finally,
mRNA and protein expressions of cyclin A, cyclin D1,
cyclin E, and p21 were analyzed.
Results Sodium valproate suppressed MCF-7 cell growth,
induced cell apoptosis, and arrested G1 phase in a timeand
concentration- dependent manner, with the relative
cell viabilities decreased, cell apoptosis ratios increased,
and percentage of G1 phase enhanced (P < 0.05). Increased
activity of caspase-3 and caspase-9, but not caspase-8, and
increased protein levels were found under sodium valproate
(2.0 mmol/L, 48h). P21 was up-regulated and cyclin
D1 was down-regulated at both mRNA and protein levels
under sodium valproate (2.0 mmol/L, 48h)(P < 0.05), although
cyclin E and cyclin A remained changed.
Conclusion These results indicate that VPA can suppress
the growth of breast cancer MCF-7 cells by inducing apoptosis
and arresting G1 phase. Intrinsic apoptotic pathway is
dominant for VPA-induced apoptosis. For G1 phase arrest,
p21 up-regulation and down-regulation of cyclin D1 may
be the main molecular mechanism
A broken "-intensity" relation caused by the evolving photosphere emission and the nature of the extraordinarily bright GRB~230307A
GRB~230307A is one of the brightest gamma-ray bursts detected so far. With
the excellent observation of GRB~230307A by Fermi-GBM, we can reveal the
details of the prompt emission evolution. As found in high-time-resolution
spectral analysis, the early low-energy spectral indices () of this
burst exceed the limit of synchrotron radiation (), and gradually
decreases with the energy flux (). A tight
correlation anyhow holds within the whole duration of the burst, where is the spectral peak energy. Such evolution pattern of and with intensity is called ``double tracking". For the relation,
we find a log Bayes factor 210 in favor of a smoothly broken power-law
function over a linear function in log-linear space. We call this particular
relation as broken ``-intensity", and interpret it as the
evolution of the ratio of thermal and non-thermal components, which is also the
evolution of the photosphere. We also show that GRB 230307A with a duration of
, if indeed at a redshift of , is likely a neutron star
merger event (i.e., it is intrinsically ``short"). Intriguingly, different from
GRB 060614 and GRB 211211A, this long event is not composed of a hard spike
followed by a soft tail, suggesting that the properties of the prompt emission
light curves are not a good tracer of the astrophysical origins of the bursts.
The other possibility of would point toward very peculiar nature of
both GRB 230307A and its late time thermal-like emission.Comment: 14 pages, 6 figures, 1 table. We have excluded the GBM instrument
pile-up time interval in the data analysis and also discussed the nature of
this even
All-trans retinoic acid restores gap junctional intercellular communication between oral cancer cells with upregulation of Cx32 and Cx43 expressions in vitro
Objective: All-trans retinoic acid (ATRA) has been demonstrated to inhibit tumor growth by restoration of gap
junctional intercellular communication (GJIC) via upregulation of connexin (Cx) expression in some solid tumors.
However, the relationship between ATRA and GJIC remains unclear in oral squamous cell carcinoma (OSCC).
The aim of this study was to investigate the effect of ATRA on the GJIC function of OSCC.
Study design: We measured the effects of ATRA on the viability and cell cycle distribution of SCC9 and Tca8113
OSCC cells. The GJIC function was observed using the scrape-loading dye transfer technique, and the mRNA and
protein levels of Cx32 and Cx43 were detected by qRT-PCR, Western blot, and immunofluorescence assays.
Results: ATRA inhibited the growth of OSCC cells in a dose- and time-dependent manner (P <0.05) and caused
cell cycle arrest. ATRA-treated cells showed a 2.69-fold and 2.06-fold enhancement of GJIC in SCC9 and Tca8113
cells, respectively (P <0.05). Moreover, ATRA induced upregulation of Cx32 and Cx43 at both the mRNA and
protein levels in OSCC cells.
Conclusion: Our results indicated that restoration of GJIC via enhanced Cx32 and Cx43 expression might serve as
a novel mechanism for the anti-tumor effect of ATRA in OSCC
Wide input-voltage range boost three-level DC-DC converter with quasi-Z source for fuel cell vehicles
To solve the problem of the mismatched voltage levels between the dynamic lower voltage of the fuel cell stack and the required constant higher voltage (400V) of the DC link bus of the inverter for fuel cell vehicles, a Boost three-level DC-DC converter with a diode rectification quasi-Z source (BTL-DRqZ) is presented in this paper, based on the conventional flying-capacitor Boost three-level DC-DC converter. The operating principle of a wide range voltage-gain for this topology is discussed according to the effective switching states of the converter and the multi-loop energy communication characteristic of the DRqZ source. The relationship between the quasi-Z source net capacitor voltages, the modulation index and the output voltage, is deduced and then the static and dynamic self-balance principle of the flying-capacitor voltage is presented. Furthermore, a Boost three-level DC-DC converter with a synchronous rectification quasi-Z source (BTL-SRqZ) is additionally proposed to improve the conversion efficiency. Finally, a scale-down 1.2 kW BTL-SRqZ prototype has been created, and the maximum efficiency is improved up to 95.66% by using synchronous rectification. The experimental results validate the feasibility of the proposed topology and the correctness of its operating principles. It is suitable for the fuel cell vehicles
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