10 research outputs found
Testing Performance of Current Video Codecs in Teleoperated Mobile Robot Applications: a Practical Experience
EvaluaciĂłn de la resistencia MecĂĄnica del adobe adicionando El 4%, 7% y 10% de asfalto Rc-250, Huaraz, Ancash â 2021
La presente investigación aborda la mejora del adobe convencional a través del
uso de asfalto liquido Rc-250, planteĂĄndonos como objetivo conocer las
caracterĂsticas fĂsicas de los materiales a utilizar, seguidamente comprobar si este
aditivo de prueba adicionado en diferentes proporciones lograba mejorar las
propiedades resistentes del adobe mediante el ensayo de resistencia a
compresiĂłn. El lugar donde se desarrollĂł el estudio fue en la ciudad de Huaraz â
Ancash; seguidamente se hizo los ensayos correspondientes de resistencia
mecĂĄnica de los adobes patrĂłn y adobes con adiciĂłn en el laboratorio Matlab
ingenierĂa sismo resistente. La metodologĂa utilizada fue de tipo aplicada con
orientación cuantitativa, el diseño fue experimental; Simultåneamente a ello, se
procediĂł plasmar los resultados alcanzados en el laboratorio de resistencia a
compresiĂłn promedia del adobe tradicional con valor de 10.75 kg/cm2
, los
resultados promedios de adobes con adiciĂłn de asfalto liquido al 4% obtuvo una
resistencia a compresiĂłn de 12.75 kg/cm2
, los adobes experimentales con adiciĂłn
de 7% resistieron 15 kg/cm2
, y los adobes con adición de 10% también tuvieron
una favorable resistencia de 16.75 kg/cm2
. Concluimos que el asfalto rc-250 es
una buena alternativa para optimizar los adobes tradicionales
Analysis of the perceptual quality performance of different HEVC coding tools
Each new video encoding standard includes encoding techniques that aim to improve the performance and quality of the previous standards. During the development of these techniques, PSNR was used as the main distortion metric. However, the PSNR metric does not consider the subjectivity of the human visual system, so that the performance of some coding tools is questionable from the perceptual point of view. To further explore this point, we have developed a detailed study about the perceptual sensibility of different HEVC video coding tools. In order to perform this study, we used some popular objective quality assessment metrics to measure the perceptual response of every single coding tool. The conclusion of this work will help to determine the set of HEVC coding tools that provides, in general, the best perceptual response
On the Performance of video quality assessment metrics under different compression and packet llss scenariov
[EN] When comparing the performance of video coding approaches, evaluating different commercial video encoders, or measuring the perceived video quality in a wireless environment, Rate/distortion analysis is commonly used, where distortion is usually measured in terms of PSNR values. However, PSNR does not always capture the distortion perceived by a human being. As a consequence, significant efforts have focused on defining an objective video quality metric that is able to assess quality in the same way as a human does. We perform a study of some available objective quality assessment metrics in order to evaluate their behavior in two different scenarios. First, we deal with video sequences compressed by different encoders at different bitrates in order to properly measure the video quality degradation associated with the encoding system. In addition, we evaluate the behavior of the quality metrics when measuring video distortions produced by packet losses in mobile ad hoc network scenarios with variable degrees of network congestion and node mobility. Our purpose is to determine if the analyzed metrics can replace the PSNR while comparing, designing, and evaluating video codec proposals, and, in particular, under video delivery scenarios characterized by bursty and frequent packet losses, such as wireless multihop environments.This research was supported by the Spanish Ministry of Education and Science under Grant no. TIN2011-27543-C0303.S.Martinez-Rach, MO.; Pinol, P.; Lopez, OM.; Perez Malumbres, M.; Oliver Gil, JS.; Tavares De Araujo Cesariny Calafate, CM. (2014). On the Performance of video quality assessment metrics under different compression and packet llss scenariov. Scientific World Journal. 2014:1-18. doi:10.1155/2014/743604S118201
ConsultorĂa para vivienda de interĂ©s social municipio de SoracĂĄ
El presente proyecto sobre la âCONSULTORĂA PARA VIVIENDA DE INTERĂS
SOCIAL MUNICIPIO DE SORACĂâ esta formulado para ofrecer una guĂa para la
construcciĂłn de viviendas de interĂ©s social (VIS) con ayuda del gobierno nacional y asĂ
poder beneficiar a la poblaciĂłn menos favorecida del municipio de SocarĂĄ. El proyecto
contempla el diseño estructurado de las etapas de desarrollo de consultorĂa que parte del
estudio de suelos y selección de beneficiarios, hasta los diseños estructurales generales
y las necesidades de obra para la construcción de 40 viviendas de interés social (VIS).
El anĂĄlisis del presente proyecto pretende identificar las etapas de desarrollo
desde la Gerencia de proyectos que estĂĄ definido bajo la GuĂa de los fundamentos para
la direcciĂłn de proyectos (PMBOKÂź) sexta ediciĂłn.The present project related to "CONSULTANCY FOR SOCIAL INTEREST
HOUSING IN MUNICIPALITY OF SORACĂ" is formulated to offer a guide for the
construction of social interest housing (VIS) with the help of the national government and
thus be able to benefit the less favored population of the municipality of SoracĂĄ. The
project contemplates the structured design of the stages of consulting development that
starts from the soil survey and the selection of beneficiaries, up to the general structural
designs and construction needs for the construction of 40 social interest homes (VIS).
The analysis of this project aims to identify the stages of development from the
Project Management that is defined under the Guide to the Basics for Project
Management (PMBOKÂź) sixth edition
Error Resilient Coding Techniques for Video Delivery over Vehicular Networks
Nowadays, more and more vehicles are equipped with communication capabilities, not only providing connectivity with onboard devices, but also with off-board communication infrastructures. From road safety (i.e., multimedia e-call) to infotainment (i.e., video on demand services), there are a lot of applications and services that may be deployed in vehicular networks, where video streaming is the key factor. As it is well known, these networks suffer from high interference levels and low available network resources, and it is a great challenge to deploy video delivery applications which provide good quality video services. We focus our work on supplying error resilience capabilities to video streams in order to fight against the high packet loss rates found in vehicular networks. So, we propose the combination of source coding and channel coding techniques. The former ones are applied in the video encoding process by means of intra-refresh coding modes and tile-based frame partitioning techniques. The latter one is based on the use of forward error correction mechanisms in order to recover as many lost packets as possible. We have carried out an extensive evaluation process to measure the error resilience capabilities of both approaches in both (a) a simple packet error probabilistic model, and (b) a realistic vehicular network simulation framework. Results show that forward error correction mechanisms are mandatory to guarantee video delivery with an acceptable quality level , and we highly recommend the use of the proposed mechanisms to increase even more the final video quality
Design and implementation of an efficient hardware integer motion estimator for an HEVC video encoder
Intubation Practices and Adverse Peri-intubation Events in Critically Ill Patients from 29 Countries
Importance: Tracheal intubation is one of the most commonly performed and high-risk interventions in critically ill patients. Limited information is available on adverse peri-intubation events. Objective: To evaluate the incidence and nature of adverse peri-intubation events and to assess current practice of intubation in critically ill patients. Design, Setting, and Participants: The International Observational Study to Understand the Impact and Best Practices of Airway Management in Critically Ill Patients (INTUBE) study was an international, multicenter, prospective cohort study involving consecutive critically ill patients undergoing tracheal intubation in the intensive care units (ICUs), emergency departments, and wards, from October 1, 2018, to July 31, 2019 (August 28, 2019, was the final follow-up) in a convenience sample of 197 sites from 29 countries across 5 continents. Exposures: Tracheal intubation. Main Outcomes and Measures: The primary outcome was the incidence of major adverse peri-intubation events defined as at least 1 of the following events occurring within 30 minutes from the start of the intubation procedure: cardiovascular instability (either: systolic pressure <65 mm Hg at least once, <90 mm Hg for >30 minutes, new or increase need of vasopressors or fluid bolus >15 mL/kg), severe hypoxemia (peripheral oxygen saturation <80%) or cardiac arrest. The secondary outcomes included intensive care unit mortality. Results: Of 3659 patients screened, 2964 (median age, 63 years; interquartile range [IQR], 49-74 years; 62.6% men) from 197 sites across 5 continents were included. The main reason for intubation was respiratory failure in 52.3% of patients, followed by neurological impairment in 30.5%, and cardiovascular instability in 9.4%. Primary outcome data were available for all patients. Among the study patients, 45.2% experienced at least 1 major adverse peri-intubation event. The predominant event was cardiovascular instability, observed in 42.6% of all patients undergoing emergency intubation, followed by severe hypoxemia (9.3%) and cardiac arrest (3.1%). Overall ICU mortality was 32.8%. Conclusions and Relevance: In this observational study of intubation practices in critically ill patients from a convenience sample of 197 sites across 29 countries, major adverse peri-intubation events - in particular cardiovascular instability - were observed frequently
The impact of surgical delay on resectability of colorectal cancer: An international prospective cohort study
The SARS-CoV-2 pandemic has provided a unique opportunity to explore the impact of surgical delays on cancer resectability. This study aimed to compare resectability for colorectal cancer patients undergoing delayed versus non-delayed surgery
The impact of surgical delay on resectability of colorectal cancer: An international prospective cohort study
AimThe SARS-CoV-2 pandemic has provided a unique opportunity to explore the impact of surgical delays on cancer resectability. This study aimed to compare resectability for colorectal cancer patients undergoing delayed versus non-delayed surgery.MethodsThis was an international prospective cohort study of consecutive colorectal cancer patients with a decision for curative surgery (January-April 2020). Surgical delay was defined as an operation taking place more than 4âweeks after treatment decision, in a patient who did not receive neoadjuvant therapy. A subgroup analysis explored the effects of delay in elective patients only. The impact of longer delays was explored in a sensitivity analysis. The primary outcome was complete resection, defined as curative resection with an R0 margin.ResultsOverall, 5453 patients from 304 hospitals in 47 countries were included, of whom 6.6% (358/5453) did not receive their planned operation. Of the 4304 operated patients without neoadjuvant therapy, 40.5% (1744/4304) were delayed beyond 4âweeks. Delayed patients were more likely to be older, men, more comorbid, have higher body mass index and have rectal cancer and early stage disease. Delayed patients had higher unadjusted rates of complete resection (93.7% vs. 91.9%, PÂ =Â 0.032) and lower rates of emergency surgery (4.5% vs. 22.5%, PâConclusionOne in 15 colorectal cancer patients did not receive their planned operation during the first wave of COVID-19. Surgical delay did not appear to compromise resectability, raising the hypothesis that any reduction in long-term survival attributable to delays is likely to be due to micro-metastatic disease