El experimento mago de oz y sus aplicaciones: una mirada retrospectiva

En la Lingüística Computacional los corpus han sido uno de los recursos más utilizados para estudiar los diferentes fenómenos lingüísticos. La recopilación de corpus en los cuales se presenta interacción entre el humano y el computador presenta como problema fundamental los errores que se pueden inducir por parte del humano, cuyo lenguaje se simplifica en presencia del computador. Para realizar la recopilación de estos corpus se han empleado los Experimentos Mago de Oz (MDO). En este artículo se muestra una mirada retrospectiva del Experimento Mago de Oz, clasificando sus principales aplicaciones

Boosting materials science simulations by high performance computing

Technology development is often limited by knowledge of materials engineering and manufacturing processes. This scenario spans across scales and disciplines, from aerospace engineering to MicroElectroMechanical Systems (MEMS) and NanoElectroMechanical Systems (NEMS). The mechanical response of materials is dictated by atomic/nanometric scale processes that can be explored by molecular dynamics (MD) simulations. In this work we employ atomistic simulations to prove indentation as a prototypical deformation process showing the advantage of High Performance Computing (HPC) implementations for speeding up research. Selecting the right HPC hardware for executing simulations is a process that usually involves testing different hardware architectures and software configurations. Currently, there are several alternatives, using HPC cluster facilities shared between several researchers, as provided by Universities or Government Institutions, owning a small cluster, acquiring a local workstation with a high-end microprocessor, and using accelerators such as Graphics Processing Units (GPU), Field Programmable Gate Arrays (FPGA), or Intel Many Integrated Cores (MIC). Given this broad set of alternatives, we run several benchmarks using various University HPC clusters, a former TOP500 cluster in a foreign computing center, two high-end workstations and several accelerators. A number of different metrics are proposed to compare the performance and aid in the selection of the best hardware architecture according to the needs and budget of researchers. Amongst several results, we find that the Titan X Pascal GPU has a ∼3 x speedup against 64 AMD Opteron CPU cores.Publicado en: Mecánica Computacional vol. XXXV, no. 10.Facultad de Ingenierí

Boosting materials science simulations by high performance computing

Technology development is often limited by knowledge of materials engineering and manufacturing processes. This scenario spans across scales and disciplines, from aerospace engineering to MicroElectroMechanical Systems (MEMS) and NanoElectroMechanical Systems (NEMS). The mechanical response of materials is dictated by atomic/nanometric scale processes that can be explored by molecular dynamics (MD) simulations. In this work we employ atomistic simulations to prove indentation as a prototypical deformation process showing the advantage of High Performance Computing (HPC) implementations for speeding up research. Selecting the right HPC hardware for executing simulations is a process that usually involves testing different hardware architectures and software configurations. Currently, there are several alternatives, using HPC cluster facilities shared between several researchers, as provided by Universities or Government Institutions, owning a small cluster, acquiring a local workstation with a high-end microprocessor, and using accelerators such as Graphics Processing Units (GPU), Field Programmable Gate Arrays (FPGA), or Intel Many Integrated Cores (MIC). Given this broad set of alternatives, we run several benchmarks using various University HPC clusters, a former TOP500 cluster in a foreign computing center, two high-end workstations and several accelerators. A number of different metrics are proposed to compare the performance and aid in the selection of the best hardware architecture according to the needs and budget of researchers. Amongst several results, we find that the Titan X Pascal GPU has a ∼3 x speedup against 64 AMD Opteron CPU cores.Publicado en: Mecánica Computacional vol. XXXV, no. 10.Facultad de Ingenierí

Demand response strategy applied to planning the operation of an air conditioning system: Application to a medical center

Large air conditioning systems, such as those used in shopping and health centers, typically demand high amounts of energy. Several air conditioning technologies and energy management strategies seek to minimize consumption to reduce billing expenses and improve system efficiency. This work proposes a demand response framework to plan the daily operation of an air conditioning system with the aim of minimizing the energy cost and guaranteeing thermal comfort. The framework includes an electrical-analogous thermal model, the formulation of the energy optimization problem with thermal and electrical constraints. The ISO 7730 standard is used to evaluate thermal comfort. The approach is applied to the air conditioning system of a radiotherapy and medical imaging center in Argentina. The optimization problem is solved through a genetic algorithm. To evaluate the strategy, two scenarios with different power demands are proposed: Case 1 (with demands lower than 300 kW) and Case 2 (with a peak demand greater than 300 kW). The results are compared with those obtained from an on-off strategy control with hysteresis. Penalties for large demands are avoided in Case 2, and therefore an economic saving of ≅ 16.8% is achieved. The thermal comfort is improved in both cases, with thermal cost reduction of 40.6% and 29.2% for Cases 1 and 2, respectively.Fil: Bragagnolo, Sergio Nicolás. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Tecnologica Nacional. Facultad Regional Cordoba. Centro de Investigacion Desarrollo y Transferencia de Ingenieria En Energia Electrica.; ArgentinaFil: Schierloh, R. M.. Universidad Tecnológica Nacional. Facultad Regional Paraná; ArgentinaFil: Vega, Jorge Ruben. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; ArgentinaFil: Vaschetti, Jorge Carlos. Universidad Tecnologica Nacional. Facultad Regional Cordoba. Centro de Investigacion Desarrollo y Transferencia de Ingenieria En Energia Electrica.; Argentin

The contribution of Trichoderma to balancing the costs of plant growth and defense

Trichoderma is a fungal genus of cosmopolitan distribution and high biotechnological value, with several species currently used as biological control agents. Additionally, the enzyme systems of the fungus are widely applied in industry. Species of Trichoderma protect plants against the attack of soil-borne plant pathogens by competing for nutrients and inhibiting or killing plant pathogenic fungi and oomycetes, through the production of antibiotics and/or hydrolytic enzymes. In addition to the role of Trichoderma spp. as biocontrol agents, they have other benefi cial effects on plants, including the stimulation of plant defenses and the promotion of plant growth. In this review, we focus on the complex plant defense signaling network that allows the recognition of fungi as non-hostile microbes, including microbial-associated molecular patterns (MAMPs), damageassociated molecular patterns (DAMPs) and secreted elicitors. We also examine how fungal interactions with plant receptors can activate induced resistance by priming and balancing plant defense and growth responses. Our observations are integrated into a model describing Trichoderma-plant hormone signaling network interactions. [Int Microbiol 2013; 16(2):69-80]Keywords: Trichoderma spp.; plant–Trichoderma symbiosis; Arabidopsis thaliana; phytohormone networking&nbsp

Phenomenological viability of orbifold models with three Higgs families

We discuss the phenomenological viability of string multi-Higgs doublet models, namely a scenario of heterotic $Z_3$ orbifolds with two Wilson lines, which naturally predicts three supersymmetric families of matter and Higgs fields. We study the orbifold parameter space, and discuss the compatibility of the predicted Yukawa couplings with current experimental data. We address the implications of tree-level flavour changing neutral processes in constraining the Higgs sector of the model, finding that viable scenarios can be obtained for a reasonably light Higgs spectrum. We also take into account the tree-level contributions to indirect CP violation, showing that the experimental value of $\epsilon_K$ can be accommodated in the present framework.Comment: 31 pages, 12 figures. Comments and references added. Final version to be published in JHE

Nearly inviscid Faraday waves in annular containers of moderately large aspect ratio

Nearly inviscid parametrically excited surface gravity–capillary waves in two-dimensional domains of finite depth and large aspect ratio are considered. Coupled equations describing the evolution of the amplitudes of resonant left- and right-traveling waves and their interaction with a mean flow in the bulk are derived, and the conditions for their validity established. Under suitable conditions the mean flow consists of an inviscid part together with a viscous mean flow driven by a tangential stress due to an oscillatory viscous boundary layer near the free surface and a tangential velocity due to a bottom boundary layer. These forcing mechanisms are important even in the limit of vanishing viscosity, and provide boundary conditions for the Navier–Stokes equation satisfied by the mean flow in the bulk. For moderately large aspect ratio domains the amplitude equations are nonlocal but decouple from the equations describing the interaction of the slow spatial phase and the viscous mean flow. Two cases are considered in detail, gravity–capillary waves and capillary waves in a microgravity environment

Planar point sets with large minimum convex decompositions

We show the existence of sets with n points (n ? 4) for which every convex decomposition contains more than (35/32)n?(3/2) polygons,which refutes the conjecture that for every set of n points there is a convex decomposition with at most n+C polygons. For sets having exactly three extreme pointswe show that more than n+sqr(2(n ? 3))?4 polygons may be necessary to form a convex decomposition

Evaluación en un modelo físico del aporte de sedimentos y de las políticas de operación del Dique Los Molinos, Jujuy

Fil: Guillén, Nicolás F. Universidad Nacional de Córdoba. Centro de Estudios y Tecnología del Agua; Argentina.Fil: Guillén, Nicolás F. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales .Laboratorio de Hidráulica; Argentina.Fil: Guillén, Nicolás F. Universidad Nacional de Córdoba. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.Fil: García, Carlos M. Universidad Nacional de Córdoba. Centro de Estudios y Tecnología del Agua; Argentina.Fil: García, Carlos M. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales .Laboratorio de Hidráulica; Argentina.Fil: García, Carlos M. Universidad Nacional de Córdoba. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.Fil: Hillman, Gerardo. Universidad Nacional de Córdoba. Centro de Estudios y Tecnología del Agua; Argentina.Fil: Hillman, Gerardo. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales .Laboratorio de Hidráulica; Argentina.El dique Los Molinos, construido en el año 1972, está ubicado sobre el Río Grande, a pocos kilómetros al oeste de la ciudad de San Salvador de Jujuy, ciudad capital de la provincia de Jujuy. El objetivo de la obra existente es la generación de una toma de derivación de agua para riego. Debido a las problemáticas existentes en la actualidad con esta obra, en este trabajo se evalúan y proponen medidas estructurales (infraestructura) y no estructurales (normas de operación de las estructuras de evacuación) para mitigar estos inconvenientes y refuncionalizar el dique. Una vez diseñadas las medidas estructurales y no estructurales, un modelo físico tridimensional a escala fue requerido para evaluar su diseño; el cual se construyó en el Laboratorio de Hidráulica de la Facultad de Ciencias Exactas Físicas y Naturales, de la Universidad Nacional de Córdoba. Este modelo físico se utilizó para realizar gran parte del trabajo aquí presentado. En este trabajo se caracterizan hidráulicamente las estructuras de descarga con la nueva configuración diseñada y se proponen 2 metodologías a implementar en el futuro para la operación de las compuertas del dique ante la presencia de una crecida. A estas políticas se las evaluaron sin y con aporte de sedimentos, analizando las diferencias entre ambos casos. El aporte de sedimentos al curso fluvial se implementó de dos formas diferentes: en forma semidiscreta y en forma continua con el empleo de tolvas vibratorias.Fil: Guillén, Nicolás F. Universidad Nacional de Córdoba. Centro de Estudios y Tecnología del Agua; Argentina.Fil: Guillén, Nicolás F. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales .Laboratorio de Hidráulica; Argentina.Fil: Guillén, Nicolás F. Universidad Nacional de Córdoba. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.Fil: García, Carlos M. Universidad Nacional de Córdoba. Centro de Estudios y Tecnología del Agua; Argentina.Fil: García, Carlos M. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales .Laboratorio de Hidráulica; Argentina.Fil: García, Carlos M. Universidad Nacional de Córdoba. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.Fil: Hillman, Gerardo. Universidad Nacional de Córdoba. Centro de Estudios y Tecnología del Agua; Argentina.Fil: Hillman, Gerardo. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales .Laboratorio de Hidráulica; Argentina.Ingeniería Civi

Análisis del espacio de trabajo de un robot paralelo de 3RRR

Comunicación presentada en las XXIX Jornadas de Automática, Tarragona, 3-5 Septiembre 2008.El objetivo de este artículo es realizar el análisis del espacio de trabajo de un robot paralelo esférico del tipo 3RRR mediante una herramienta matemática desarrollada en Matlab. Este 3RRR contiene una particularidad que lo diferencia con respecto a los robots esféricos comunes debido a las exigencias de su aplicación: su centro de rotación no se encuentra en el centro del robot. Basándonos en un parámetro que define la habilidad o destreza del robot (dexterity), calcularemos el valor de las variables que optimizan su espacio de trabajo