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Juan, Bermejo-Ballesteros,Javier, Cubas,Francisco, Casas,Enrique, Martinez-Gonzalez Techno-Press 2022 Advances in aircraft and spacecraft science Vol.9 No.5
Space-telescopes placed in the Sun-Earth second Lagrange point (L2) observe the sky following a scan strategy that is usually based on a spin-precession motion. Knowing which regions of the sky will be more observed by the instrument is important for the science operations and the instrument calibration. Computing sky observation parameters numerically (discretizing time and the sky) can consume large amounts of time and computational resources, especially when high resolution isrequired.This problem becomesmore critical if quantities are evaluated at detector level instead of considering the instrument entire Field of View (FoV). In previous studies, the authors have derived analytic solutions for quantities that characterize the observation of each point in the sky in terms of observation time according to the scan strategy parameters and the instrument FoV. Analytic solutions allow to obtain results faster than using numerical methods as well as capture detailed characteristics which can be overseen due to discretization limitations. The original approach is based on the analytic expression of the instrument trace over the sky. Such equations are implicit and thusrequiresthe use of numeric solversto compute the quantities.In this work, a new and simpler approach for computing one ofsuch quantities(mean observation time) is presented.The quantity is first computed for pure spin motion and then the effect of the spin axis precession is incorporated under the assumption that the precession motion is slow compared to the spin motion.In this sense, this new approach further simplifies the analytic approach, sparing the use of numeric solvers, which reduces the complexity of the implementation and the computing time.
Juan, Bermejo-Ballesteros,Javier, Cubas,Francisco, Casas,Enrique, Martinez-Gonzalez Techno-Press 2022 Advances in aircraft and spacecraft science Vol.9 No.5
Space-telescopes placed in the Sun-Earth second Lagrange point (L2) observe the sky following a scan strategy that is usually based on a spin-precession motion. Knowing which regions of the sky will be more observed by the instrument is important for the science operations and the instrument calibration. Computing sky observation parameters numerically (discretizing time and the sky) can consume large amounts of time and computational resources, especially when high resolution isrequired.This problem becomesmore critical if quantities are evaluated at detector level instead of considering the instrument entire Field of View (FoV). In previous studies, the authors have derived analytic solutions for quantities that characterize the observation of each point in the sky in terms of observation time according to the scan strategy parameters and the instrument FoV. Analytic solutions allow to obtain results faster than using numerical methods as well as capture detailed characteristics which can be overseen due to discretization limitations. The original approach is based on the analytic expression of the instrument trace over the sky. Such equations are implicit and thusrequiresthe use of numeric solversto compute the quantities.In this work, a new and simpler approach for computing one ofsuch quantities(mean observation time) is presented.The quantity is first computed for pure spin motion and then the effect of the spin axis precession is incorporated under the assumption that the precession motion is slow compared to the spin motion.In this sense, this new approach further simplifies the analytic approach, sparing the use of numeric solvers, which reduces the complexity of the implementation and the computing time.
Perirenal and epicardial fat and their association with carotid intima-media thickness in children
Abel López-Bermejo,Anna Prats-Puig,Inés Osiniri,Jose-Maria Martínez-Calcerrada,Judit Bassols 대한소아내분비학회 2019 Annals of Pediatirc Endocrinology & Metabolism Vol.24 No.4
Recent data suggest that subclinical atherosclerosis is more related to visceral adipose tissue distribution than to overall fat mass. Both perirenal fat and epicardial fat are visceral fat depots surrounding the kidneys and the myocardium, respectively, which can be easily assessed by ultrasound. Their clinical relevance in children is largely unknown. This review describes studies relating perirenal and epicardial fat to cardiovascular disease or carotid intima-media thickness (cIMT), a well-established surrogate for subclinical atherosclerosis, and discusses this in context with our own data from children. In adults, both perirenal and epicardial fat are useful biological markers of visceral obesity. The former has been related to hypertension in overweight subjects and with atherosclerosis in patients with human immunodeficiency virus. The latter was associated with several metabolic syndrome components and with calcification of the carotid artery. In healthy prepubertal children, both epicardial and perirenal fat thickness, rather than total body fat mass, were related to cIMT. Ultrasonography measures of perirenal and epicardial fat are related to atherosclerosis in adults and may be convenient tools for the assessment of cardiometabolic risk in children.
Detecting Malware in Cyberphysical Systems Using Machine Learning: a Survey
( Montes F. ),( Bermejo J. ),( Sánchez L. E. ),( Bermejo J. R. ),( Sicilia J. A. ) 한국인터넷정보학회 2021 KSII Transactions on Internet and Information Syst Vol.15 No.3
Among the scientific literature, it has not been possible to find a consensus on the definition of the limits or properties that allow differentiating or grouping the cyber-physical systems (CPS) and the Internet of Things (IoT). Despite this controversy the papers reviewed agree that both have become crucial elements not only for industry but also for society in general. The impact of a malware attack affecting one of these systems may suppose a risk for the industrial processes involved and perhaps also for society in general if the system affected is a critical infrastructure. This article reviews the state of the art of the application of machine learning in the automation of malware detection in cyberphysical systems, evaluating the most representative articles in this field and summarizing the results obtained, the most common malware attacks in this type of systems, the most promising algorithms for malware detection in cyberphysical systems and the future lines of research in this field with the greatest potential for the coming years.
David Villanueva-Bermejo,Tiziana Fornari,Maria V. Calvo,Javier Fontecha,Jose A.P. Coelho,Rui M. Filipe,Roumiana P. Stateva 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.82 No.-
The kinetics of the supercriticalfluid extraction of edible and discarded chia seeds was studied andmodelled for thefirst time. The total oil was removed at 45 MPa and 60 C after 240 min. The extractionkinetics was simulated using a dynamic model in gPROMS ModelBuilder environment and the kineticparameters estimated. Triolein was chosen as a model compound of the chia oil. The agreement betweenthe experimental yields and those calculated by the model was good with deviations in the range(1.2–6.6) %, except at 25 MPa and 60 C (AARD = 9.5%).
THE EFFECT OF BRAND FAMILIARITY AND REPETITION OF PRODUCT PLACEMENT IN VIDEO GAMES
José Martí-Parreño,Jesús Bermejo-Berros,Joaquín Aldás-Manzano 글로벌지식마케팅경영학회 2016 Global Marketing Conference Vol.2016 No.7
A factorial design 2 (high repetition vs low repetition) x 2 (high brand familiarity vs low brand familiarity) is used to test the effects of repetition and brand familiarity on consumers’ memory for brands placed in video games. Consumers recalled better familiar brands and repetition increased recall for familiar brands.
Effect of local cut-out on fatigue strength assessment in ship structures
Silva-Campillo Arturo,Suárez-Bermejo J.C.,Herreros-Sierra M.A. 대한조선학회 2023 International Journal of Naval Architecture and Oc Vol.15 No.-
The aim of the work is to evaluate different design alternatives to obtain criteria for the selection of the most effective design by fatigue strength assessment of the local cut-out as a result of the connection between the longitudinal or ordinary stiffener and the transverse web frame (longi-web) in the side hull structure (upper wing torsional box), very important area due to its high stress concentration, of a container vessel, one of the most important ships in terms of its influence on the world economy. Structural solutions and design guidelines are established, by means of numerical models validated by experimental tests, which allow alternative designs to be obtained that improve their fatigue behaviour. Standard cut-out geometries are studied under the presence of different variables (radius of curvature, longitudinal spacing, longitudinal stiffener cross-section, and flange arrangement) that are evaluated to determine their effect in the structural assessment (fatigue damage, stress concentration, and fracture mechanics) and the weight comparison between alternatives.
Silva-Campillo Arturo,Suárez-Bermejo J.C.,Herreros-Sierra M.A.,de Vicente M. 대한조선학회 2021 International Journal of Naval Architecture and Oc Vol.13 No.1
Container ships has a transverse section in the form of an open profile, making it very sensitive to torsion phenomena. To minimize this effect, a structure known as a torsion box exists, which is subject to high stresses influenced by the fatigue phenomenon and the existence of cut-outs, for the passage of the longitudinal stiffeners, acting as stress concentrators. The aim of this study is to propose a two-stage design methodology to aid designers in satisfying the structural requirements and contribute with to a better understanding of the considered structure. The transverse webs of a torsional box structure are examined by comparing different cut-out geometries from numerical models with different regular load conditions to obtain the variables of the fatigue safety factor through linear regression models. The most appropriate geometry of the torsion box is established in terms of minimum weight, from nonlinear multivariable optimization models.
Fixed bed column modeling of lead(II) and cadmium(II) ions biosorption on sugarcane bagasse
Luisa Mayra Vera,Daniel Bermejo,Maria Fernanda Uguna,Nancy Garcia,Marittza Flores,Enrique Gonzalez 대한환경공학회 2019 Environmental Engineering Research Vol.24 No.1
In this paper the results of the biosorption of lead(II) and cadmium(II) with sugarcane bagasse in fixed bed columns are presented. Experimental data were fitted to several models describing the rupture curve for single-component and two-component systems. The percentages of removal of lead and cadmium in single-component systems are 91% and 90%, respectively. In lead-cadmium bicomponent systems the percentage of elimination of lead was 90% and cadmium 92%. In single-component systems, Yoon-Nelson and Thomas models successfully reproduce the rupture curves. In two-component system, the Dose-Response model was the best one reproducing the experimental rupture curves in the entire measured range.
Angelo E. Tapia-Araya,Idoia Díaz-Güemes Martin-Portugués,Laura Fresno Bermejo,Francisco Miguel Sánchez-Margallo 대한수의학회 2015 Journal of Veterinary Science Vol.16 No.4
This study was conducted to evaluate the feasibility and therapeutic safety of laparoendoscopic single-site ovariectomy (LESS-OVE) and 3-portal laparoscopic ovariectomy (Lap-OVE) in dogs. Ten female mixed breed dogs were included in the study. Dogs were divided into group 1 (LESS-OVE; n = 5) and group 2 (Lap-OVE; n = 5). All procedures were performed by laparoscopic-skilled surgeons, and the anesthetic protocol was the same for all patients. In both groups, the ovarian vascular pedicle and ligaments were transected using a bipolar vessel sealer/divider device. The mean total surgical time was slightly longer in LESS-OVE (36.6 ± 3.5 min) than Lap-OVE (32.0 ± 3.0 min); however, the differences were not significant. Perioperative complications were not reported in any group. Both laparoscopic techniques were shown to be equally feasible and safe for patients. However, surgeons found LESS-OVE to require more skill than Lap-OVE. Therefore, additional studies should be conducted to evaluate this novel approach in clinical veterinary practice, and a proper laparoscopic training program for veterinary surgeons should be developed.