Improved Multiplierless Architecture for Header Detection in DVB-S2 Standard

International audienceOne of the first processing steps in a DVB-S2 signal receiver is the detection of frame's header. Recently, an architecture using only the phase information of the received samples was proposed. In this paper several optimization in algo-rithm/architecture are proposed, leading to better performance and reduced hardware complexity. For an SNR of-3 dB, the probability of miss detection of the header detector is reduced from 0.7 down to 0.52 for a constant false alarm probability of 10 −6

A reformulation to Embedding a Neural Network in a linear program without integer variables

In this technical report, a new formulation for embedding a neural network into an optimization model is described. This formulation does not require binary variables to properly compute the output of the neural network for specific types of problems. Preliminary experiments show that this reformulation resulted in faster computation times when solving a proposed showcase model, in which non-linearity is necessary to be computed. This is in comparison with the classic formulation and off-the-shelf tools of commercial solvers

Elaboración del mapa de usos del suelo para los cierres previstos sobre el río Colorado prov. de La Pampa y Río Negro – República Argentina

El objetivo del presente trabajo consistió en determinar, a través de herramientas de teledetección y trabajo de campo, el uso del suelo dado a la zona de influencia de los cierres previstos entre Casa de Piedra y Salto Andersen a lo largo del río Colorado, obras cuya finalidad es la de generar recursos hidroeléctricos y de riego. Los estudios, financiados por el Consejo Federal de Inversiones, se encuentran aún a nivel de inventario a excepción del cierre de Huelches, que se halla a nivel de Prefactibilidad. La caracterización del área de estudio permitió elaborar un mapa de uso del suelo y cobertura vegetal en base a la adaptación de la Clasificación para el proyecto de ocupación del suelo de España (CORINE - Land Cover 2000), donde se tomaron dos grande grupos: (A) Suelos productivos y (B) Suelos improductivos, ambos con 5 categorías a saber: para el primero (1) zonas de uso agrícola; (2) de uso forestal; (3) de praderas; (4) de vegetación de áreas húmedas continentales; (5) superficies de aguas. Para el segundo grupo: (6) superficies edificadas e infraestructuras; (7) obras de ingeniería, industriales y de transportes; (8) zonas de extracción minera, vertederos y de construcción; (9) zonas verdes no agrícolas; (10) espacios abiertos con vegetación joven a nula. Todas las categorías presentan unidades de menor jerarquía. De la cartografía obtenida resulta evidente que el desarrollo de dichas categorías está en función del hecho de que el río Colorado, según Linares et. al (1980), atraviesa en el tramo en cuestión tres ambientes geológicos diferentes: Sierras Pampeanas hacia el este; Sanrafaelino Pampeana en el sector central y Cuenca Neuquina al oeste

Simulación de Khepera IV en V-REP

[Resumen] En los últimos años la robótica ha tenido un gran impacto en los entornos educativos a todos los niveles. En estos ámbitos los simuladores han jugado un papel fundamental en el uso de la Robótica en el proceso de enseñanza-aprendizaje. El presente artículo describe el diseño, la implementación y las pruebas de un modelo del robot Khepera IV para incorporarlo al simulador V-REP. El objetivo fundamental es obtener una herramienta lista para ser usada en enseñanza de la Robótica en el Área la de Ingeniería de Control.Este trabajo ha sido financiado por el Ministerio de Economía y Competitividad de España bajo el Proyecto de Ivestigación DPI2012-31303https://doi.org/10.17979/spudc.978849749808

Colección de mastozoología del Museo de La Plata

La colección de Mastozoología del Museo de La Plata (Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata) comenzó formando parte de un repositorio más amplio que incluía ejemplares de invertebrados y vertebrados vivientes, en el ámbito del Departamento Zoología, cuyo primer jefe fue Fernando Lahille (Torres, 1927). En este contexto, los primeros materiales de mamíferos, correspondientes a esqueletos, se ingresaron en 1908. A partir de 1936 se inició la catalogación independiente de los mamíferos (Frengüelli, 1937: 38), esencialmente de materiales obtenidos mediante donación o colecta a partir de principios del siglo XX. Es una de las colecciones más ricas del país en número de ejemplares (cerca de 6000), y es la segunda más antigua. Está integrada por pieles, cráneos, esqueletos, y en menor proporción materiales conservados en fluidos. Parte de los esqueletos y ejemplares taxidermizados se exponen en cuatro salas de exhibición del Museo (salas XIV, XV, XVI y XVII).Eje 1: Manejo de Colecciones y GestiónRed de Museos de la Universidad Nacional de La Plat

Colección de mastozoología del Museo de La Plata

Fil: Olivares, Adriana Itatí. División Zoología Vertebrados. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; ArgentinaFil: Merino, Mariano Lisandro. División Zoología Vertebrados. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; ArgentinaFil: Ruperto, Emmanuel. División Zoología Vertebrados. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; ArgentinaFil: Verzi, Diego Héctor. Sección Mastozoología. División Zoología Vertebrados. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; Argentin

Industry 4.0 Competencies as the Core of Online Engineering Laboratories

Online laboratories are widely used in higher engineering education and due to the COVID-19 pandemic, they have taken on an even greater relevance. At Tecnologico de Monterrey, Mexico, well-established techniques such as Problem-Based Learning (PBL), Project-Oriented Learning (POL) and Research-Based Learning (RBL) have been implemented over the years, and over the past year, have been successfully incorporated into the students’ learning process within online and remote laboratories. Nevertheless, these learning techniques do not include an element which is crucial in today’s industrialized world: Industry 4.0 competencies. Therefore, this work aims to describe a pedagogical approach in which the development of Industry based competencies complements the aforementioned learning techniques. The use and creation of virtual environments and products is merged with the understanding of fundamental engineering concepts. Further, a measurement of the students’ perceived self-efficacy related to this pedagogical approach is carried out, focusing on the physiological states and mastery experiences of the students. An analysis of its results is presented as well as a discussion on these findings, coupled with the perspectives from different key stakeholders on the importance of the educational institutions’ involvement in developing Industry 4.0 competencies in engineering students. Finally, comments regarding additional factors which play a role in the educational process, but were not studied at this time, as well as additional areas of interest are given

The Effect of Simulated Leg-Length Discrepancy on the Dynamic Parameters of the Feet during Gait-Cross-Sectional Research

Background: The effect of Leg-Length Discrepancy (LLD) on dynamic gait parameters has been extensively discussed. Podobarography is the study of foot-to-ground pressure distribution. It has been used to test plantar footprint deviations that could reveal pathology. Purpose: The aim of this study is to determine the effects of simulated LLD on dynamic gait parameters measured with a pressure platform in healthy subjects. Methods: Thirty-seven healthy subjects participated in observational cross-sectional research. A procedure was performed to capture the dynamic parameters of each participant under five different simulated LLD conditions. Support time, mean pressure, and peak pressure measures were registered on three trials for each foot and LLD level per session. An analysis of variance (ANOVA) test for repeated measures was performed to check for differences between the different simulated LLD levels. Results: The stance time of the short leg had no significant changes. The stance time of the long leg increased by 3.51% (p < 0.001), mean pressure of the short leg increased by 1.23% (p = 0.005), and decreased by 5.89% in the long leg (p < 0.001). Peak pressure of the short leg decreased by 2.58% (p = 0.031) and the long leg decreased by 12.11% (p < 0.001). Conclusions: This study demonstrates that increasing LLD causes an asymmetrical foot-loading pattern, with decreased mean and peak pressure on the longer limb, and consequently an overload on the short side. Furthermore, an increasing LLD causes increased stance time on the long leg

Repeatability and Reliability of the Rheumatoid Arthritis Foot Disease Activity Index in Spanish Patients : A Transcultural Adaptation

The Rheumatoid Arthritis Foot Disease Activity Index (RADAI-F5) questionnaire, based on five questions, is used to assess the severity of rheumatoid arthritis disease in the foot. Nowadays, RADAI-F5 has been validated in different languages; however a Spanish version was lacking. Therefore, the purpose of this research was to translate and validate the Spanish version (RADAI-F5-es). Methods: A cross-cultural translation of the RADAI-F5 questionnaire was performed from English to Spanish. To validate its use, 50 subjects with rheumatoid arthritis who responded to the translated questionnaire two times in an interval of less than 3 months were selected in order to verify the psychometric properties. Results: Excellent agreement between the two versions according to the Cronbach's α was shown. Five domains with regards to arthritis activity in foot joint tenderness and swelling, foot arthritis pain, general foot health and joint stiffness were added together to obtain the total score. Excellent retest reliability was shown for the total score. Test/retest reliability was excellent for joint stiffness on awakening and foot arthritis pain domains. There were no significant differences among any domains (p > 0.05). There were no statistically significant differences (p = 0.000) for the mean ± standard deviations (SD) between pre- and post-tests (98.09 ± 15.42) [93.75-102.43] and 97.96 ± 13.88 [94.5-101.86] points, respectively). Bland-Altman plots or clinically pertinent variations were not statistically significantly different. Conclusions: The RADAI-F5-es is considered a valid and strong tool with adequate repeatability in the Spanish communit

La esofagitis eosinofílica. ¿El Norte contra el Sur? Enfoque mecanicista bio-económico-social e implicaciones clínicas

La esofagitis eosinofílica (EEo) es una enfermedad crónica mediada por alérgenos, caracterizada por síntomas esofágicos, eosinofilia esofágica y ausencia de respuesta favorable a inhibidores de la bomba de protones (IBP). En los adultos es la causa más frecuente de disfagia e impactación alimentaria. Su incidencia y prevalencia son muy altas en los países desarrollados (EUA, Europa y Australia), en donde ha alcanzado una connotación de epidemia. Mientras que en los países desarrollados se publican estudios con grandes series de pacientes, en nuestro subcontinente se reporta en series con pocos casos o en casos aislados. Las causas de las diferencias de la prevalencia de la enfermedad entre ambas regiones se desconocen. Se han invocado causas genéticas o raciales. No obstante, el carácter epidémico de la enfermedad sugiere que las causas ambientales son más poderosas. Con base en hipótesis publicadas, así como en los estudios epidemiológicos, en la presente revisión se discutirán algunas de las posibles causas de la disparidad de prevalencia de la EEo entre ambos tipos de países. Se revisará la «hipótesis de la higiene», así como la posible relación del Helicobacter pylori, los parásitos intestinales y las modificaciones de la microbiota esofágica con la EEo. Con base en estudios realizados en EUA, se revisará el comportamiento clínico y evolutivo de la EEo en individuos hispanos y se discutirá acerca de un posible fenotipo predominante en los pacientes de América Latina y México. Finalmente, sobre la base anterior, se propondrá un algoritmo de estudio de la enfermedad en nuestros países. ABSTRAC Eosinophilic esophagitis is a chronic antigen-mediated disease characterized by esophageal symptoms, esophageal eosinophilia, and the absence of response to proton pump inhibitors. It is the most frequent cause of dysphagia and food impaction in adults. Its incidence and prevalence is very high in the developed countries (USA, Europe, Australia), where its connotation is that of an emerging epidemic. While studies have been published with large case series in the developed countries, those published in Latin America are small or consist of isolated case reports. The differences in the prevalence of the disease between the developed and developing regions are unknown. Genetic or racial causes have been cited. Nevertheless, the epidemic nature of the disease suggests that environmental causes are the most powerful. Based on the published hypotheses, as well as on epidemiologic studies, the present review discusses some of the possible causes of the disparity in the prevalence of eosinophilic esophagitis between the two types of countries. The ‘hygiene hypothesis’ is reviewed, together with the possible relation of Helicobacter pylori, intestinal parasites, and modifications of the esophageal microbiota in patients with eosinophilic esophagitis. In reference to studies conducted in the United States, the clinical behavior and progression of eosinophilic esophagitis in Hispanics is reviewed and a possible predominant phenotype in Mexican and other Latin American patients is discussed. Finally, based on the above, an algorithm for studying the disease in the Latin American countries is proposed