La ludoteca escolar, ¿sólo un espacio para el juego? : Secuencia didáctica sobre escritura de reglamentos

Fil: Fernandez, Adriana Miriam. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

La ludoteca escolar, ¿sólo un espacio para el juego? : Secuencia didáctica sobre escritura de reglamentos

Fil: Fernandez, Adriana Miriam. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

Decir el acontecimiento límite : Dos ficciones sobre Malvinas

En este trabajo nos proponemos indagar las relaciones que se establecen entre discurso histórico y discurso ficcional en la representación de acontecimientos extremos del pasado reciente. Para ello, analizaremos -a partir, fundamentalmente, de los aportes de Paul Ricoeur y Dominick LaCapra- dos novelas que ficcionalizan la guerra de Malvinas y que fueron escritas en los ?80: A sus plantas rendido un león, de Osvaldo Soriano, y Arde aún sobre los años, de Fernando López. A partir del análisis se pretende reflexionar acerca de algunas de las diferentes posibilidades que tiene la literatura para representar un acontecimiento límite: el humor y la parodia, en el caso de A sus plantas rendido un león, y la configuración de una narrativa redentora, en el caso de Arde aún sobre los años

Decir el acontecimiento límite : Dos ficciones sobre Malvinas

En este trabajo nos proponemos indagar las relaciones que se establecen entre discurso histórico y discurso ficcional en la representación de acontecimientos extremos del pasado reciente. Para ello, analizaremos -a partir, fundamentalmente, de los aportes de Paul Ricoeur y Dominick LaCapra- dos novelas que ficcionalizan la guerra de Malvinas y que fueron escritas en los ?80: A sus plantas rendido un león, de Osvaldo Soriano, y Arde aún sobre los años, de Fernando López. A partir del análisis se pretende reflexionar acerca de algunas de las diferentes posibilidades que tiene la literatura para representar un acontecimiento límite: el humor y la parodia, en el caso de A sus plantas rendido un león, y la configuración de una narrativa redentora, en el caso de Arde aún sobre los años

La ludoteca escolar, ¿sólo un espacio para el juego? : Secuencia didáctica sobre escritura de reglamentos

Fil: Fernandez, Adriana Miriam. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

Solving Incidents in Telecommunications Using a Multiagent System

This article presents the model and implementation of a multiagent fuzzy system (MAFS), to automate the search of solutions of incidents in telecommunications, expressed by the users in an imprecise way and, later, registered in a a knowledge base keeping their original vaguenesses and the relationships between the incidents considered as ancestors and descendants. The process of the fuzzy incidents, no matter their causes, is based on the application of a formula which transforms the intervals of the fuzzy incidents to a computational language and in the interaction between the different kinds of software agents and the humans. To search and suggest solutions of the incident originally stated, a search algorithm is used and illustrated with an example. The preliminary results obtained show the users' satisfaction, in a great percentage of the presented cases. The system is adaptive and allows to record new solutions for future users.

A CAD framework for the characterization and use of Memristor models

In the recent years the missing fourth component, the memristor, was successfully synthesized. However, the mathematical complexity and variety of the models behind this component, in addition to the existence of convergence problems in the simulations, make the design of memristor-based applications long and difficult. In this work we present a memristor model characterization framework which supports the automated generation of subcircuit files. The proposed environment allows the designer to choose and parameterize the memristor model that best suits for a given application. The framework carries out characterizing simulations in order to study the possible non-convergence problems, solving the dependence on the simulation conditions and guaranteeing the functionality and performance of the design. Additionally, the occurrence of undesirable effects related to PVT variations is also taken into account. By performing a Monte Carlo or a corner analysis, the designer is aware of the safety margins which assure the correct device operation.

Temperature Sensor Placement Including Routing Overhead and Sampling Inaccuracies

Dynamic thermal management techniques require a collection of on-chip thermal sensors that imply a significant area and power overhead. Finding the optimum number of temperature monitors and their location on the chip surface to optimize accuracy is an NP-hard problem. In this work we improve the modeling of the problem by including area, power and networking constraints along with the consideration of three inaccuracy terms: spatial errors, sampling rate errors and monitor-inherent errors. The problem is solved by the simulated annealing algorithm. We apply the algorithm to a test case employing three different types of monitors to highlight the importance of the different metrics. Finally we present a case study of the Alpha 21364 processor under two different constraint scenarios.

Modelo de arquitectura para gestión cooperativa de sistemas y servicios distribuidos basado en agentes autónomos

La creciente complejidad, heterogeneidad y dinamismo inherente a las redes de telecomunicaciones, los sistemas distribuidos y los servicios avanzados de información y comunicación emergentes, así como el incremento de su criticidad e importancia estratégica, requieren la adopción de tecnologías cada vez más sofisticadas para su gestión, su coordinación y su integración por parte de los operadores de red, los proveedores de servicio y las empresas, como usuarios finales de los mismos, con el fin de garantizar niveles adecuados de funcionalidad, rendimiento y fiabilidad. Las estrategias de gestión adoptadas tradicionalmente adolecen de seguir modelos excesivamente estáticos y centralizados, con un elevado componente de supervisión y difícilmente escalables. La acuciante necesidad por flexibilizar esta gestión y hacerla a la vez más escalable y robusta, ha provocado en los últimos años un considerable interés por desarrollar nuevos paradigmas basados en modelos jerárquicos y distribuidos, como evolución natural de los primeros modelos jerárquicos débilmente distribuidos que sucedieron al paradigma centralizado. Se crean así nuevos modelos como son los basados en Gestión por Delegación, en el paradigma de código móvil, en las tecnologías de objetos distribuidos y en los servicios web. Estas alternativas se han mostrado enormemente robustas, flexibles y escalables frente a las estrategias tradicionales de gestión, pero continúan sin resolver aún muchos problemas. Las líneas actuales de investigación parten del hecho de que muchos problemas de robustez, escalabilidad y flexibilidad continúan sin ser resueltos por el paradigma jerárquico-distribuido, y abogan por la migración hacia un paradigma cooperativo fuertemente distribuido. Estas líneas tienen su germen en la Inteligencia Artificial Distribuida (DAI) y, más concretamente, en el paradigma de agentes autónomos y en los Sistemas Multi-agente (MAS). Todas ellas se perfilan en torno a un conjunto de objetivos que pueden resumirse en alcanzar un mayor grado de autonomía en la funcionalidad de la gestión y una mayor capacidad de autoconfiguración que resuelva los problemas de escalabilidad y la necesidad de supervisión presentes en los sistemas actuales, evolucionar hacia técnicas de control fuertemente distribuido y cooperativo guiado por la meta y dotar de una mayor riqueza semántica a los modelos de información. Cada vez más investigadores están empezando a utilizar agentes para la gestión de redes y sistemas distribuidos. Sin embargo, los límites establecidos en sus trabajos entre agentes móviles (que siguen el paradigma de código móvil) y agentes autónomos (que realmente siguen el paradigma cooperativo) resultan difusos. Muchos de estos trabajos se centran en la utilización de agentes móviles, lo cual, al igual que ocurría con las técnicas de código móvil comentadas anteriormente, les permite dotar de un mayor componente dinámico al concepto tradicional de Gestión por Delegación. Con ello se consigue flexibilizar la gestión, distribuir la lógica de gestión cerca de los datos y distribuir el control. Sin embargo se permanece en el paradigma jerárquico distribuido. Si bien continúa sin definirse aún una arquitectura de gestión fiel al paradigma cooperativo fuertemente distribuido, estas líneas de investigación han puesto de manifiesto serios problemas de adecuación en los modelos de información, comunicación y organizativo de las arquitecturas de gestión existentes. En este contexto, la tesis presenta un modelo de arquitectura para gestión holónica de sistemas y servicios distribuidos mediante sociedades de agentes autónomos, cuyos objetivos fundamentales son el incremento del grado de automatización asociado a las tareas de gestión, el aumento de la escalabilidad de las soluciones de gestión, soporte para delegación tanto por dominios como por macro-tareas, y un alto grado de interoperabilidad en entornos abiertos. A partir de estos objetivos se ha desarrollado un modelo de información formal de tipo semántico, basado en lógica descriptiva que permite un mayor grado de automatización en la gestión en base a la utilización de agentes autónomos racionales, capaces de razonar, inferir e integrar de forma dinámica conocimiento y servicios conceptualizados mediante el modelo CIM y formalizados a nivel semántico mediante lógica descriptiva. El modelo de información incluye además un “mapping” a nivel de meta-modelo de CIM al lenguaje de especificación de ontologías OWL, que supone un significativo avance en el área de la representación y el intercambio basado en XML de modelos y meta-información. A nivel de interacción, el modelo aporta un lenguaje de especificación formal de conversaciones entre agentes basado en la teoría de actos ilocucionales y aporta una semántica operacional para dicho lenguaje que facilita la labor de verificación de propiedades formales asociadas al protocolo de interacción. Se ha desarrollado también un modelo de organización holónico y orientado a roles cuyas principales características están alineadas con las demandadas por los servicios distribuidos emergentes e incluyen la ausencia de control central, capacidades de reestructuración dinámica, capacidades de cooperación, y facilidades de adaptación a diferentes culturas organizativas. El modelo incluye un submodelo normativo adecuado al carácter autónomo de los holones de gestión y basado en las lógicas modales deontológica y de acción.---ABSTRACT---The growing complexity, heterogeneity and dynamism inherent in telecommunications networks, distributed systems and the emerging advanced information and communication services, as well as their increased criticality and strategic importance, calls for the adoption of increasingly more sophisticated technologies for their management, coordination and integration by network operators, service providers and end-user companies to assure adequate levels of functionality, performance and reliability. The management strategies adopted traditionally follow models that are too static and centralised, have a high supervision component and are difficult to scale. The pressing need to flexibilise management and, at the same time, make it more scalable and robust recently led to a lot of interest in developing new paradigms based on hierarchical and distributed models, as a natural evolution from the first weakly distributed hierarchical models that succeeded the centralised paradigm. Thus new models based on management by delegation, the mobile code paradigm, distributed objects and web services came into being. These alternatives have turned out to be enormously robust, flexible and scalable as compared with the traditional management strategies. However, many problems still remain to be solved. Current research lines assume that the distributed hierarchical paradigm has as yet failed to solve many of the problems related to robustness, scalability and flexibility and advocate migration towards a strongly distributed cooperative paradigm. These lines of research were spawned by Distributed Artificial Intelligence (DAI) and, specifically, the autonomous agent paradigm and Multi-Agent Systems (MAS). They all revolve around a series of objectives, which can be summarised as achieving greater management functionality autonomy and a greater self-configuration capability, which solves the problems of scalability and the need for supervision that plague current systems, evolving towards strongly distributed and goal-driven cooperative control techniques and semantically enhancing information models. More and more researchers are starting to use agents for network and distributed systems management. However, the boundaries established in their work between mobile agents (that follow the mobile code paradigm) and autonomous agents (that really follow the cooperative paradigm) are fuzzy. Many of these approximations focus on the use of mobile agents, which, as was the case with the above-mentioned mobile code techniques, means that they can inject more dynamism into the traditional concept of management by delegation. Accordingly, they are able to flexibilise management, distribute management logic about data and distribute control. However, they remain within the distributed hierarchical paradigm. While a management architecture faithful to the strongly distributed cooperative paradigm has yet to be defined, these lines of research have revealed that the information, communication and organisation models of existing management architectures are far from adequate. In this context, this dissertation presents an architectural model for the holonic management of distributed systems and services through autonomous agent societies. The main objectives of this model are to raise the level of management task automation, increase the scalability of management solutions, provide support for delegation by both domains and macro-tasks and achieve a high level of interoperability in open environments. Bearing in mind these objectives, a descriptive logic-based formal semantic information model has been developed, which increases management automation by using rational autonomous agents capable of reasoning, inferring and dynamically integrating knowledge and services conceptualised by means of the CIM model and formalised at the semantic level by means of descriptive logic. The information model also includes a mapping, at the CIM metamodel level, to the OWL ontology specification language, which amounts to a significant advance in the field of XML-based model and metainformation representation and exchange. At the interaction level, the model introduces a formal specification language (ACSL) of conversations between agents based on speech act theory and contributes an operational semantics for this language that eases the task of verifying formal properties associated with the interaction protocol. A role-oriented holonic organisational model has also been developed, whose main features meet the requirements demanded by emerging distributed services, including no centralised control, dynamic restructuring capabilities, cooperative skills and facilities for adaptation to different organisational cultures. The model includes a normative submodel adapted to management holon autonomy and based on the deontic and action modal logics.

Entrevista con José María Martín Pereda: "La microelectrónica en España casi no existe"

Desde el pasado mes de diciembre, un catedrático de la Escuela Superior de Ingenieros de Telecomunicación tiene la responsabilidad de confeccionar, desde la Caicyt, el Plan Nacional de Investigación Científica y Desarrollo Tecnológico que prevé la Ley de la Ciencia, recientemente aprobada por el Congreso de los Diputados. Se trata de José Antonio Martín Pereda, que también es, junto a Fernando López, Subdirector General de Industrias Informáticas, representante español en el Programa Esprit. En la siguiente entrevista, Actualidad Electrónica ha hablado con Martín Pereda sobre la viabilidad del Plan, el futuro tecnológico de nuestro país y las oportunidades que se le presentan a España en la segunda fase del Esprit.

Building memristor applications: from device model to circuit design

Since the memristor was first built in 2008 at HP Labs, no end of devices and models have been presented. Also, new applications appear frequently. However, the integration of the device at the circuit level is not straightforward, because available models are still immature and/or suppose high computational loads, making their simulation long and cumbersome. This study assists circuit/systems designers in the integration of memristors in their applications, while aiding model developers in the validation of their proposals. We introduce the use of a memristor application framework to support the work of both the model developer and the circuit designer. First, the framework includes a library with the best-known memristor models, being easily extensible with upcoming models. Systematic modifications have been applied to these models to provide better convergence and significant simulations speedups. Second, a quick device simulator allows the study of the response of the models under different scenarios, helping the designer with the stimuli and operation time selection. Third, fine tuning of the device including parameters variations and threshold determination is also supported. Finally, SPICE/Spectre subcircuit generation is provided to ease the integration of the devices in application circuits. The framework provides the designer with total control overconvergence, computational load, and the evolution of system variables, overcoming usual problems in the integration of memristive devices.

Four-injector variability modeling of FinFET predictive technology models

The usual way of modeling variability using threshold voltage shift and drain current amplification is becoming inaccurate as new sources of variability appear in sub-22nm devices. In this work we apply the four-injector approach for variability modeling to the simulation of SRAMs with predictive technology models from 20nm down to 7nm nodes. We show that the SRAMs, designed following ITRS roadmap, present stability metrics higher by at least 20% compared to a classical variability modeling approach. Speed estimation is also pessimistic, whereas leakage is underestimated if sub-threshold slope and DIBL mismatch and their correlations with threshold voltage are not considered.

A tool for the automatic analysis of single events effects on electronic circuits

Nowadays integrated circuit reliability is challenged by both variability and working conditions. Environmental radiation has become a major issue when ensuring the circuit correct behavior. The required radiation and later analysis performed to the circuit boards is both fund and time expensive. The lack of tools which support pre-manufacturing radiation hardness analysis hinders circuit designers tasks. This paper describes an extensively customizable simulation tool for the characterization of radiation effects on electronic systems. The proposed tool can produce an in depth analysis of a complete circuit in almost any kind of radiation environment in affordable computation times.

Processos e significados da experiência de pais, mães ou cuidador primário de crianças abusadas sexualmente

Introdução - O abuso sexual de crianças constitui um problema de saúde pública, com aproximadamente 73 milhões de casos de meninos e 150 milhões de meninas registrados anualmente no mundo. O abuso sexual gera consequências negativas e condutas de risco que contribuem com algumas das principais causas de morte, doença e deficiência nas vítimas do abuso. Pais ou cuidadores primários são fundamentais no processo de orientação e de cuidado das crianças abusadas, no sentido de prevenir as consequências cognitivas, comportamentais e emocionais evidenciadas no futuro dessas crianças. Entretanto, as habilidades das famílias de cuidadores para lidar com a problemática ainda são insuficientes. Objetivo - Descrever os processos e significados da experiência vivida pelos pais ou cuidadores primários de crianças abusadas sexualmente. Método - Os dados empíricos foram tratados utilizando-se o Discurso do Sujeito Coletivo (DSC), fundamentado na Teoria das Representações Sociais, que viabiliza a emergência das representações sociais por meio da construção dos discursos coletivos obtidos de depoimentos de um grupo específico. Foram avaliados 60 pais ou cuidadores primários não estupradores, que responderam à cinco situações-problema, cada uma com questões correspondentes, residentes nos municípios de Cajicá e Tabio de Bogotá, Colômbia. O processamento e a análise dos dados foram realizados no sofware Qualiquantisoft, associado à metodologia do DSC. Resultados - Na primeira situação-problema, que aborda o porquê do silêncio do filho sobre o abuso, os entrevistados enfatizaram que é fundamental o relacionamento pais e filhos (45,7 por cento , n = 43), bem como melhorar o papel de pais por meio da escuta, do diálogo e do confiar, dedicando mais tempo às crianças; também acham que o silêncio se deve ao medo por parte das crianças e a ameaças e intimidação por parte do abusador, Na situação-problema 2, relativa à identificação do abuso sexual como problema real, o significado atribuído configura cadeias que se repetem por transmissão intergeracional (26,9 por cento , n = 21). Na situação-problema 3, o que fazer no futuro, 53,3 por cento dos entrevistados (n = 32) acham que a criança está comprometida comportamentalmente e enfatizam a homossexualidade com perda da identidade como consequência da violência sexual. Na situação-problema 4, que enfatiza o papel da rede social quanto ao cuidado da criança, os entrevistados acreditam que a solução é dar proteção (29,1 por cento ; n = 32), com ações que visem a afastar a criança do ambiente agressor, dar orientação, apoio e segurança à criança e à família. A quinta situação-problema que diz respeito ao cuidado das crianças abusadas; 34,26 por cento dos entrevistados (n = 37) enfatizam o apoio e a ajuda com a interveniência da rede de apoio social e afetivo. Conclusão - Para os pais ou cuidadores primários de crianças abusadas sexualmente, os significados se expressam como afetivo, coragem, superação, não ter medo e saber reconhecer as falhas dos pais. Em função dos resultados, que identificam posturas tradicionais dos respondentes, recomenda-se programas inovadores com um alto componente educativo, onde se contextualize o abuso sexual por meio de situações reais em escolas, delegacias, nas famílias e na comunidade, com interveniência das redes de apoio social; enfatiza-se igualmente a necessidade de formação mais humanizada dos profissionais de apoio social.

Polarimetric SAR model for soil moisture estimation over vineyards at C-band

In this paper we propose a two-component polarimetric model for soil moisture estimation on vineyards suited for C-band radar data. According to a polarimetric analysis carried out here, this scenario is made up of one dominant direct return from the soil and a multiple scattering component accounting for disturbing and nonmodeled signal fluctuations from soil and short vegetation. We propose a combined X-Bragg/Fresnel approach to characterize the polarized direct response from soil. A validation of this polarimetric model has been performed in terms of its consistency with respect to the available data both from RADARSAT-2 and from indoor measurements. High inversion rates are reported for different phenological stages of vines, and the model gives a consistent interpretation of the data as long as the volume component power remains about or below 50% of the surface contribution power. However, the scarcity of soil moisture measurements in this study prevents the validation of the algorithm in terms of the accuracy of soil moisture retrieval and an extensive campaign is required to fully demonstrate the validity of the model. Different sources of mismatches between the model and the data have been also discussed and analyzed.