1,351 research outputs found
Fast Fight Detection
Action recognition has become a hot topic within computer vision. However, the action recognition community has focused mainly on relatively simple actions like clapping, walking, jogging, etc. The detection of specific events with direct practical use such as fights or in general aggressive behavior has been comparatively less studied. Such capability may be extremely useful in some video surveillance scenarios like prisons, psychiatric centers or even embedded in camera phones. As a consequence, there is growing interest in developing violence detection algorithms. Recent work considered the well-known Bag-of-Words framework for the specific problem of fight detection. Under this framework, spatio-temporal features are extracted from the video sequences and used for classification. Despite encouraging results in which high accuracy rates were achieved, the computational cost of extracting such features is prohibitive for practical applications. This work proposes a novel method to detect violence sequences. Features extracted from motion blobs are used to discriminate fight and non-fight sequences. Although the method is outperformed in accuracy by state of the art, it has a significantly faster computation time thus making it amenable for real-time applications
NĂveis de desfolha tolerados na cultura da soja sem a ocorrĂȘncia de prejuĂzos Ă produtividade.
NĂvel de ação e o MIP-Soja. Ensaios com injĂșria na fase inicial da lavoura: Londrina, PR ? Safras 2001/2002 e 2002/2003. Ensaios com diferentes nĂveis de desfolha em diferentes fases do desenvolvimento: NĂŁo-Me-Toque-RS e Sorriso-MT ? Safra 2008/2009. Ensaios com diferentes nĂveis de desfolha contĂnua durante diferentes fases do desenvolvimento: Morrinhos, GO ? Safra 2009/2010. Resultados obtidos que comprovam a segurança dos nĂveis de ação recomendados. ConsideraçÔes finais.bitstream/item/31176/1/CT79VE.pd
Automatic Inference of Determinacy and Mutual Exclusion for Logic Programs Using Mode and Type Analyses
We propose an analysis for detecting procedures and goals
that are deterministic (i.e., that produce at most one solution at most once),or predicates whose clause tests are mutually exclusive (which implies that at most one of their clauses will succeed) even if they are not deterministic.
The analysis takes advantage of the pruning operator in order to improve the detection of mutual exclusion and determinacy. It also supports arithmetic equations and disequations, as well as equations and disequations on terms,for which we give a complete satisfiability testing algorithm, w.r.t. available type information. Information about determinacy can be used for program debugging and optimization, resource consumption and granularity control,
abstraction carrying code, etc. We have implemented the analysis and integrated it in the CiaoPP system, which also infers automatically the mode and type information that our analysis takes as input. Experiments performed on this implementation show that the analysis is fairly accurate and efficient
Numerical and experimental study of the motion of a sphere in a communicating vessel system subject to sloshing
The purpose of this work is twofold: to present a computational strategy to simulate the dynamics of a rigid sphere during water sloshing and to validate the model with original experimental data. The numerical solution is obtained through the coupling between a two-fluid Navier-Stokes solver and a rigid solid dynamics solver, based on a Newton scheme. A settling sphere case reported in the literature is first analyzed to validate the numerical strategy by ascertaining the settling velocity. In addition, an experiment is carried out based on a sphere submerged into a communicating vessel subjected to sloshing. Experimental data are captured using image processing and statistically treated to provide sphere dynamics quantitative information. The effects of different classical models used to describe drag coefficients, added mass, and wall effects are considered in the study to evaluate their influence on the results. The numerical model provides results that are consistent with the physical data, and the trajectory analysis shows good agreement between the simulations and the experiments.Fil: Zamora, Esteban. Universidad Nacional del Litoral; ArgentinaFil: Battaglia, Laura. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - Santa Fe. Centro de Investigaciones en MĂ©todos Computacionales. Universidad Nacional del Litoral. Centro de Investigaciones en MĂ©todos Computacionales; ArgentinaFil: Storti, Mario Alberto. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - Santa Fe. Centro de Investigaciones en MĂ©todos Computacionales. Universidad Nacional del Litoral. Centro de Investigaciones en MĂ©todos Computacionales; ArgentinaFil: Cruchaga, Marcela. Universidad de Santiago de Chile; ChileFil: Ortega, Roberto. Universidad de Santiago de Chile; Chil
The Limited Influence of Pressure Gradients on Late-type Stellar Line Asymmetries
Line asymmetries and shifts are a powerful tool for studying velocity fields
in the stellar photospheres. Other effects, however, could also generate
asymmetries blurring the information of the velocity patterns. We have studied
the shifts and asymmetries induced in the profiles of spectral lines by
pressure effects. The best theoretical and experimental data on line broadening
and shifts caused by collisions with atomic hydrogen were used to analyze the
NaI D and three CaI lines. Line bisectors of synthetic spectra computed with
accurate data for the NaI and CaI lines are compared with very high resolution
high signal-to-noise ratio solar spectra and indicate that pressure broadening
reproduces the wings of the observed lines, but pressure shifts introduce
neither asymmetries nor shifts comparable to the observed ones.Comment: Latex file (19 pages), uses aasms4.sty, 5 Postscript figures,
accepted for publication in The Astrophysical Journa
Stability and Clinical Efficacy of Moisturizing Cosmetic Formulations Containing Vitamins C and E
The addition of different active substances in cosmetics, e.g. vitamins and their derivatives, has been quite frequent. In this
way, it is fundamental to evaluate the stability and efficacy of cosmetic formulations containing these ingredients. The
objective of this work was to evaluate the physical stability and the clinical efficacy of moisturizing cosmetic formulations
based on panthenol, and containing ascorbyl tetraisopalmitate and α-tocopherol acetate. Formulations were developed
with panthenol (FA), panthenol and ascorbyl tetraisopalmitate and α-tocopherol acetate (FBC). The latter was submitted
to rheological behavior analysis and all were characterized as stable. Next, they were subjectively and objectively
analyzed for clinical efficacy in 25 volunteers. Sensory evaluation and biophysical and skin imaging techniques were used
to measure stratum corneum water content, transepidermal water loss (TEWL), and skin microrelief. These were carried
out before application of the formulations and then after 3 hours. The formulations studied showed acceptable stability
according to the physical aspects under consideration. In the clinical efficacy studies, both formulations significantly
improved skin hydration and reduced TEWL. There was also improvement in skin microrelief but these results were not
statistically significant. FBC received higher scores than FAin the sensory analysis as there was a significant improvement
in the skin's smoothness, besides being preferred in purchase intent
Cardiac Insulin Resistance in Subjects With Metabolic Syndrome Traits and Early Subclinical Atherosclerosis.
OBJECTIVE
Experimental evidence suggests that metabolic syndrome (MetS) is associated with changes in cardiac metabolism. Whether this association occurs in humans is unknown.
RESEARCH DESIGN AND METHODS
821 asymptomatic individuals from the Progression of Early Subclinical Atherosclerosis (PESA) study (50.6 [46.9-53.6] years, 83.7% male) underwent two whole-body 18F-fluorodeoxyglucose positron emission tomography-magnetic resonance (18F-FDG PET-MR) 4.8 ± 0.6 years apart. Presence of myocardial 18F-FDG uptake was evaluated qualitatively and quantitatively. No myocardial uptake was grade 0, while positive uptake was classified in grades 1-3 according to target-to-background ratio tertiles.
RESULTS
One hundred fifty-six participants (19.0%) showed no myocardial 18F-FDG uptake, and this was significantly associated with higher prevalence of MetS (29.0% vs. 13.9%, P < 0.001), hypertension (29.0% vs. 18.0%, P = 0.002), and diabetes (11.0% vs. 3.2%, P < 0.001), and with higher insulin resistance index (HOMA-IR, 1.64% vs. 1.23%, P < 0.001). Absence of myocardial uptake was associated with higher prevalence of early atherosclerosis (i.e., arterial 18F-FDG uptake, P = 0.004). On follow-up, the associations between myocardial 18F-FDG uptake and risk factors were replicated, and MetS was more frequent in the group without myocardial uptake. The increase in HOMA-IR was associated with a progressive decrease in myocardial uptake (P < 0.001). In 82% of subjects, the categorization according to presence/absence of myocardial 18F-FDG uptake did not change between baseline and follow-up. MetS regression on follow-up was associated with a significant (P < 0.001) increase in myocardial uptake.
CONCLUSIONS
Apparently healthy individuals without cardiac 18F-FDG uptake have higher HOMA-IR and higher prevalence of MetS traits, cardiovascular risk factors, and early atherosclerosis. An improvement in cardiometabolic profile is associated with the recovery of myocardial 18F-FDG uptake at follow-up.The PESA study is funded by the
Centro Nacional de Investigaciones Cardiovasculares (CNIC) and Santander Bank. B.I. is supported by the European Commission (grant
numbers 819775 and 945118), by the Spanish
Ministry of Science and Innovation (PID2019-
110369RB-I00), and by the Red Madrilena de ~
Nanomedicina en Imagen Molecular-Comunidad
de Madrid (S2017/BMD-3867 RENIM-CM). A.D.
is an Alfonso Martin Escudero fellow and is scientifically supported by La Caixa Foundation.
The CNIC is supported by the Instituto de Salud
Carlos III (ISCIII), the Ministerio de Ciencia e Innovacion (MCIN), and the Pro CNIC Foundation,
and is a Severo Ochoa Center of Excellence
(grant CEX2020-001041-S funded by MICIN/AEI/
10.13039/501100011033).S
Advances on the automatic estimation of the P-wave onset time.
This work describes the automatic picking of the P-phase arrivals of the 3*10^6 seismic registers originated during the TOMO-ETNA experiment. Air-gun shots produced by the vessel âSarmiento de Gamboaâ and contemporary passive seismicity occurring in the island are recorded by a dense network of stations deployed for the experiment. In such scenario, automatic processing is needed given: (i) the enormous amount of data,
(ii) the low signal-to-noise ratio of many of the available registers and, (iii) the accuracy needed for the velocity tomography resulting from the experiment. A preliminary processing is performed with the records obtained from all stations. Raw data formats from the different types of stations are unified, eliminating defective records and reducing noise through filtering in the band of interest for the phase picking. The advanced multiband picking algorithm (AMPA) is then used to process the big database obtained and determine the travel times of the seismic phases. The approach of AMPA, based on frequency multiband denoising
and enhancement of expected arrivals through optimum detectors, is detailed together with its calibration and quality assessment procedure. Examples of its usage for active and passive seismic events are presented.PublishedS04342V. Dinamiche di unrest e scenari pre-eruttiviJCR Journalope
Extracellular NK histones promote immune cell anti-tumor activity by inducing cell clusters through binding to CD138 receptor.
BACKGROUND: Natural killer (NK) cells are important anti-tumor cells of our innate immune system. Their anti-cancer activity is mediated through interaction of a wide array of activating and inhibitory receptors with their ligands on tumor cells. After activation, NK cells also secrete a variety of pro-inflammatory molecules that contribute to the final immune response by modulating other innate and adaptive immune cells. In this regard, external proteins from NK cell secretome and the mechanisms by which they mediate these responses are poorly defined. METHODS: TRANS-stable-isotope labeling of amino acids in cell culture (TRANS-SILAC) combined with proteomic was undertaken to identify early materials transferred between cord blood-derived NK cells (CB-NK) and multiple myeloma (MM) cells. Further in vitro and in vivo studies with knock-down of histones and CD138, overexpression of histones and addition of exogenous histones were undertaken to confirm TRANS-SILAC results and to determine functional roles of this material transferred. RESULTS: We describe a novel mechanism by which histones are actively released by NK cells early after contact with MM cells. We show that extracellular histones bind to the heparan sulfate proteoglycan CD138 on the surface of MM cells to promote the creation of immune-tumor cell clusters bringing immune and MM cells into close proximity, and thus facilitating not only NK but also T lymphocyte anti-MM activity. CONCLUSION: This study demonstrates a novel immunoregulatory role of NK cells against MM cells mediated by histones, and an additional role of NK cells modulating T lymphocytes activity that will open up new avenues to design future immunotherapy clinical strategies
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