On the Expressiveness of LARA: A Unified Language for Linear and Relational Algebra

We study the expressive power of the Lara language - a recently proposed unified model for expressing relational and linear algebra operations - both in terms of traditional database query languages and some analytic tasks often performed in machine learning pipelines. We start by showing Lara to be expressive complete with respect to first-order logic with aggregation. Since Lara is parameterized by a set of user-defined functions which allow to transform values in tables, the exact expressive power of the language depends on how these functions are defined. We distinguish two main cases depending on the level of genericity queries are enforced to satisfy. Under strong genericity assumptions the language cannot express matrix convolution, a very important operation in current machine learning operations. This language is also local, and thus cannot express operations such as matrix inverse that exhibit a recursive behavior. For expressing convolution, one can relax the genericity requirement by adding an underlying linear order on the domain. This, however, destroys locality and turns the expressive power of the language much more difficult to understand. In particular, although under complexity assumptions the resulting language can still not express matrix inverse, a proof of this fact without such assumptions seems challenging to obtain

Assessment of generative strategies in self-support groups in people affected by the Colombian armed political conflict

The paper presents a research applied from an appreciative approach that aimed to assess the use of generative strategies in self-support groups in a population affected by the armed political conflict in Colombia. The generative approach intends to build a notion of desirable and possible future, by means of dialogic strategies. These dialogues strengthen community ties, show new action strategies and stimulate metaphors in relation to violent affectation amid the conflict. The research sample was formed by 11 people divided into two groups, residents in the city of Bucaramanga, Colombia. The advantaged actions inside the self-support groups were the identification of the discursive links among the participants, the clarification of the thematic nodes among them, the selection of metaphors and the transformation of narratives. The results point out that the intervention generated the observation and identification of resources, action planning, search of new experiences, reflexivity,and recognition of the novelty to transform conflict affectation. It is concluded that through self-support groups, people transform the meaning of their experience by sharing stories and action resources for the future, which verifies the purposes of the generative approach. The psychologist was a facilitator of the process amid the relevance of languageas a means of transformation. It was also concluded that through self-support groups emerges the truth of a conflict through public practices by telling the stories of affectation.Generative approach; Self-support Group; Language; Colombia; Narrative

Estado del arte en aplicaciones móviles para parálisis facial: información, diagnóstico y rehabilitación

This paper presents a state of the art of mobile applications aimed at patients and professionals around facial paralysis. A window of exploration is established between 2009 and 2019, geolocated in countries that have promoted the development of such applications. The objective is to provide a frame of reference for the implementations and to serve, in perspective, as a baseline for research of the Autonomous Mobile Robotics group (ROMA for its Spanish acronym) attached to the Scientific Research and Development Center of the Francisco José de Caldas District University -CIDC- and categorized in COLCIENCIAS. A bibliographic search was carried out in the following search engines: Google Scholar, Microsoft Academic, Bielefeld Academic Search Engine (BASE); databases: Dialnet, Directory of Open Access Journals (DOAJ), PubMed, Redalyc, Scientific Electronic Library Online (SciELO) and Scopus; and information sources specific to the field of mobile applications: Google Play (Android), App Store-Apple (iOS) and Windows Store (Windows Mobile/ Windows Phone). It is concluded that the mobile applications available in the current market of such platforms are few, informative and diagnostic and for facial rehabilitation; it is noted that there are projects in universities in Latin America, the United States, Europe and Asia focused on marketing products generated for therapeutic purposes.En este artículo se presenta un estado del arte de las aplicaciones móviles orientadas a pacientes y profesionales respecto a la parálisis facial. Se establece una ventana de exploración entre los años 2009 y 2019, geolocalizada en países que han promovido el desarrollo de tales aplicaciones. El objetivo es proporcionar un marco de referencia de  las implementaciones  y que sirva, en perspectiva, como línea de base para investigaciones del grupo de Robótica Móvil Autónoma (ROMA) adscrito al Centro de Investigaciones y Desarrollo Científico de la Universidad Distrital Francisco José de Caldas –CIDC– y categorizado en COLCIENCIAS. Se realizó una búsqueda bibliográfica en los motores de búsqueda: Google Scholar, Microsoft Academic, Bielefeld Academic Search Engine (BASE); bases de datos: Dialnet, Directory of Open Access Journals (DOAJ), PubMed, Redalyc, Scientific Electronic Library Online (SciELO) y  Scopus; y fuentes de información propias del campo de las aplicaciones móviles: Google Play (Android), App Store-Apple (iOS) y Windows Store (Windows Mobile/ Windows Phone). Se concluye que las aplicaciones móviles disponibles en el mercado actual de tales plataformas son pocas, de carácter informativo y de diagnóstico y para la rehabilitación facial; se destaca que existen proyectos en universidades de Latinoamérica, Estado Unidos, Europa y Asía enfocados en comercializar los productos generados con fines terapéuticos

Concreto hidráulico modificado con sílice obtenida de la cascarilla del arroz

The cement is one of the raw materials in the production of the hydraulic concrete, but its production is considered one of the most polluting processes on our planet. The research project analyzes the mechanical, physical and chemical behavior of a mix of hydraulic concrete modified with silica obtained from the incineration of rice husk. The used methodology was an experimental design that was worked with cement Holcim M1 Concretera, it was used as pattern sample, a mix design of hydraulic concrete for a compressive strength of 350 Kg/cm2, and flexural strength of 42 Kg/cm2. The modification was made by replacing the cement by ash rice husk (silica), in proportions of 5%, 15% and 30%. The results show viability for the replacement percentage of 5% in the compressive strength, indirect strain and flexural, therefore there is a technical feasibility to apply this procedure.El cemento es una de las materias primas en la producción del concreto hidráulico, pero su producción es considerada como uno de los procesos más contaminantes en nuestro planeta. El proyecto de investigación analiza el comportamiento mecánico, físico y químico de una mezcla de concreto hidráulico modificado con sílice obtenida por la incineración de cascarilla de arroz. La metodología utilizada fue un diseño experimental que se trabajó con cemento Holcim M1 Concretera, se utilizó como muestra patrón un diseño de mezcla de concreto hidráulico para una resistencia a la compresión de 350 Kg/cm2, y resistencia a la flexión de 42 Kg/cm2. La modificación se realizó mediante la sustitución del cemento por ceniza de cascarilla de arroz (sílice), en proporciones del 5%, 15% y 30%. Los resultados muestran la viabilidad para el porcentaje de sustitución de 5% en la resistencia a la compresión, la tracción indirecta y a la flexión, por lo tanto, hay una viabilidad técnica para aplicar este procedimiento

Measurement of Coherent Production of pi(+/-) in Neutrino and Antineutrino Beams on Carbon from E-upsilon of 1.5 to 20 GeV

Neutrino-induced coherent charged pion production on nuclei upsilon((-))(mu)A -- \u3e mu(+/-)pi(-/+)A is a rare, inelastic interaction in which a small squared four-momentum |t| is transferred to the recoil nucleus, leaving it intact in the reaction. In the scintillator tracker of MINERvA, we remove events with evidence of particles from nuclear breakup and reconstruct |t| from the final-state pion and muon. We select low |t| events to isolate a sample rich in coherent candidates. By selecting low |t| events, we produce a model-independent measurement of the differential cross section for coherent scattering of neutrinos and antineutrinos on carbon. We find poor agreement with the predicted kinematics in neutrino generators used by current oscillation experiments

Identificación de lesiones cerebrales de esclerosis múltiple en imágenes de resonancia magnética mediante análisis de textura

La esclerosis múltiple (EM) es una enfermedad neurodegenerativa que ataca al sistema nervioso central (SNC), produce lesiones desmielinizantes y causa secuelas funcionales en adultos jóvenes, especialmente mujeres. Su diagnóstico y seguimiento se realizan a través de la resonancia magnética. En la actualidad, el análisis de texturas se ha convertido en una herramienta útil para la detección de este tipo lesiones. Por tal razón, en este artículo se busca identificar lesiones de EM utilizando los métodos de matrices de co-ocurrencia de nivel de gris y transformada wavelet (TW), y como métodos de clasificación redes neuronales (ANN) y máquinas de soporte vectorial (SVM) en imágenes de resonancia magnética (RMI) en secuencia FLAIR de 5 pacientes con diagnóstico de la enfermedad. La combinación apropiada de medidas de matrices de co-ocurrencia y wavelets permitieron obtener precisiones superiores a 96% para las máquinas de soporte vectorial y 90% para las redes neuronales, lo que demuestra que el uso combinado de dichas medidas es superior en la detección de estas lesionesLa esclerosis múltiple (EM) es una enfermedad neurodegenerativa que ataca al sistema nervioso central (SNC), produce lesiones desmielinizantes y causa secuelas funcionales en adultos jóvenes, especialmente mujeres. Su diagnóstico y seguimiento se realizan a través de la resonancia magnética. En la actualidad, el análisis de texturas se ha convertido en una herramienta útil para la detección de este tipo lesiones. Por tal razón, en este artículo se busca identificar lesiones de EM utilizando los métodos de matrices de co-ocurrencia de nivel de gris y transformada wavelet (TW), y como métodos de clasificación redes neuronales (ANN) y máquinas de soporte vectorial (SVM) en imágenes de resonancia magnética (RMI) en secuencia FLAIR de 5 pacientes con diagnóstico de la enfermedad. La combinación apropiada de medidas de matrices de co-ocurrencia y wavelets permitieron obtener precisiones superiores a 96% para las máquinas de soporte vectorial y 90% para las redes neuronales, lo que demuestra que el uso combinado de dichas medidas es superior en la detección de estas lesiones

Design, construction and evaluation of a Fresnel Linear Concentrator for Oil Heating

The goal of this work is to describes the design and development of a fresnel linear concentrator that be able to concentrate sun radiations towards a receiver tube with a concentration ratio of 11, 54. The methodology applied allowed to analysis the spacing, the inclinations and the adequate widths of the mirrors that would be more convenient to obtain the highest solar concentration factor and the minimum optical and thermal losses. The design of the solar concentration collector consisted of a 3.5 m x 3.0 m x 2.65 m system with 15 mirrors, each one measuring 0.12 m wide, and a receiving center height of 2.0 m. The experimental results confirmed that the maximum process temperature of 140 ° C was achieved. In addition, a thermal oil storing was 995 kJ-h available in a 6-hour (since 9:00h until 15:00h). The performance tests of the system were performed in the city of Barranquilla, with local environmental conditions. The experimental tests of the prototype finally allowed to validate the design proposed in this present work

Design, construction and evaluation of a Fresnel Linear Concentrator for Oil Heating

The goal of this work is to describes the design and development of a fresnel linear concentrator that be able to concentrate sun radiations towards a receiver tube with a concentration ratio of 11, 54. The methodology applied allowed to analysis the spacing, the inclinations and the adequate widths of the mirrors that would be more convenient to obtain the highest solar concentration factor and the minimum optical and thermal losses. The design of the solar concentration collector consisted of a 3.5 m x 3.0 m x 2.65 m system with 15 mirrors, each one measuring 0.12 m wide, and a receiving center height of 2.0 m. The experimental results confirmed that the maximum process temperature of 140 ° C was achieved. In addition, a thermal oil storing was 995 kJ-h available in a 6-hour (since 9:00h until 15:00h). The performance tests of the system were performed in the city of Barranquilla, with local environmental conditions. The experimental tests of the prototype finally allowed to validate the design proposed in this present work