641 research outputs found

    Status of the James Webb Space Telescope

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    The James Webb Space Telescope (JWST) is a large aperture (6.5 meter), cryogenic space telescope with a suite of near and mid-infrared instruments covering the wavelength range of 0.6 J,Jm to 28 J,Jm. JWST's primary science goal is to detect and characterize the first galaxies. It will also study the assembly of galaxies, star formation, and the formation of evolution of planetary systems. JWST is a segmented mirror telescope operating at approx.40K, a temperature achieved by passive cooling of the observatory, via a large, 5-layer membrane-based sunshield. We present an overview of the observatory design, the mission science objectives, the integration and test program and review the concept for science operations of JWST. With construction of the observatory progressing rapidly across all elements of the observatory, we will report on recent highlights such as the completion of the first JWST primary mirror segment. We will also review the predicted performance of the JWST observatory, based on initial measurements of the telescope optics and instrumentation

    Cross: an OWL wrapper for teasoning on relational databases

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    One of the challenges of the Semantic Web is to integrate the huge amount of information already available on the standard Web, usually stored in relational databases. In this paper, we propose a formalization of a logic model of relational databases, and a transformation of that model into OWL, a Semantic Web language. This transformation is implemented in Cross, as an open-source prototype. We prove a relation between the notion of legal database state and the consistency of the corresponding OWL knowledge base. We then show how that transformation can prove useful to enhance databases, and integrate them in the Semantic Web

    Semantic Analysis of Learning Traces

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    A Knowledge-Based Approach to Augment Applications with Interaction Traces

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    International audienceThis paper presents a trace-based framework for assisting personalization and enrichment of end-user experience in an application. We propose a modular ontology-based architecture, to provide semantics for interaction traces, observed elements and their associated objects, and we extend existing inference services, with a declarative and generic approach, in order to reason with those interaction traces. We present the architecture of our framework and its reasoning levels, provide a proof of concept on a medical Web application, and emphasize that different kinds of actors can benefit from the supported inferences

    Ontology-based recommender system in higher education

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    International audienceAcademic advising is limited in its ability to assist students in identifying academic pathways. Selecting a major and a university is a challenging process rife with anxiety. Students at high school are not sure how to match their interests with their working future or major. Therefore, high school students need guidance and support. Moreover, students need to filter, prioritize and efficiently get appropriate information from the web in order to solve the problem of information overload. This paper represents an approach for developing ontology-based recommender system improved with machine learning techniques to orient students in higher education. The proposed recommender system is an assessment tool for students' vocational strengths and weaknesses, interests and capabilities. The main objective of our ontology-based recommender system is to identify the student requirements, interests, preferences and capabilities to recommend the appropriate major and university for each one

    Centro multidisciplinario de creación artística en el Cuartel Santa Catalina

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    El proyecto consiste en la recuperación del Cuartel Santa Catalina para la creación de un centro cultural multidisciplinario para la creación y promoción del arte contemporáneo. El cuartel se configura actualmente como un vacío urbano por la falta de uso del inmueble lo que causa el deterioro de su estructura por la falta de mantenimiento. La recuperación se basa en los principios de la restauración crítica, la cual propone el uso de este tipo de edificaciones con fines sociales respetando la forma del edificio original, pero adecuándolo con mira hacia el futuro y no con fines de preservar el monumento intacto. La propuesta del nuevo programa responde a las deficiencias que existen en torno a la promoción del arte contemporáneo y a la educación cultural en nuestro país. A esto le sumamos la insatisfacción de los limeños con respecto a las actividades culturales y el limitado acceso que se tiene a estos de parte de la mayoría de la población. Por ello se entiende que la importancia de la creación de un centro cultural, además de encargarse de la exposición del arte, funcione para la creación de nuevas piezas, formación e identificación de talentos y conexión de estos con el mundo laboral. Este programa consta de cuatro partes que se complementan: el centro cultural, el centro comercial de arte utilitario, el programa educativo y la residencia para artistas. Estos usos a nivel de la arquitectura tienen ciertos requerimientos que han sido cubiertos para su total funcionamiento, para ello se han explorado teorías y criterios como los de adaptabilidad en la arquitectura, las distintas relaciones de vacío para entender cómo crear a partir de este concepto y las distintas relaciones que puede tener un proyecto de restauración y recuperación de este tipo. Asimismo, se consideraron ejemplos de centros culturales internacionales para entender el funcionamiento y las necesidades que tienen estos espacialmente. Finalmente, el estudio del entorno y las dinámicas existentes juegan un papel importante en las decisiones tomadas a nivel proyectual. El Centro Multidisciplinario de Creación Artística es un modelo distinto de centro cultural el cual puede ser replicado y adaptado en distintos proyectos de restauración. Además, genera un equipamiento público en la zona que ayuda a acercar las dinámicas culturales a los usuarios que llegan al Centro de Lima. Finalmente, cumple con recuperar este inmueble monumental y revaloriza los elementos importantes a través de estrategias basadas en el estudio del propio del cuartel y el entorno que lo rodea.The project consists of the recovery of the Santa Catalina barracks for the creation of a multidisciplinary cultural center for the creation and promotion of contemporary art. The barracks are currently configured as an urban void due to the lack of use of the property, which causes the deterioration of its structure due to lack of maintenance. The recovery is based on the principles of critical-conservative approach on restoration, which proposes the use of this type of building for social purposes, respecting the shape of the original building, but adapting it with a view to the future and not for the purpose of preserving the monument intact. The proposal of the new program responds to the deficiencies that exist around the promotion of contemporary art and cultural education in Perú. To this we add the dissatisfaction of the people of Lima with respect to cultural activities and the limited access that the majority of the population has to these. For this reason, it is understood that the importance of creating a cultural center, in addition to being in charge of the art exhibition, works for the creation of new pieces, training and identification of talents and their connection with the world. This program consists of four complementary parts: the cultural center, the utilitarian art shopping center, the educational program and the residence for artists. These uses determine at the architectural level certain requirements that have been covered for their full operation, for which theories and criteria have been explored such as those of adaptability in architecture, the different relationships of void to understand how to create from this concept and the different relationships that a restoration project of this type can have. Likewise, examples of international cultural centers were considered to understand the operation and the needs that these have spatially. Finally, the study of the area and the existing dynamics play an important role in the decisions made at the project level. The Multidisciplinary Center for Artistic Creation results in a different model of cultural center which can be replicated and adapted in different restoration projects. In addition, it generates a public facility in the area that helps to bring cultural dynamics closer to users who arrive to downtown Lima. Finally, it complies with recovering this monumental property and revalues the important elements through strategies based on the study of the barracks itself and the environment that surrounds it
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