1,721,080 research outputs found
Automatic extraction of metadata as support for the self-archiving of digital objects in repositories
Full text linkEn este trabajo se propone facilitar al usuario el autoarchivo de sus objetos digitales
educativos en un repositorio institucional. Para esto, se modifica el flujo de carga
estándar de la plataforma DSpace, proponiendo un nuevo flujo para el depósito de
objetos de modo que pueda integrarse en este proceso un extractor de metadatos. Se
presenta una arquitectura abierta de un módulo extractor automático de algunos
metadatos de los documentos. Estos metadatos extraídos automáticamente son luego
validados por el usuario en el proceso de descripción del objeto. Para diseñar el
extractor se analizaron distintas herramientas de extracción y se optó por la
combinación que arrojó mejores resultados. Este módulo se ha diseñado de modo de
poder integrar otras herramientas extractoras. Se ha desarrollado un prototipo en JAVA
de este asistente y se ha experimentado sobre dos corpus de documentos, uno en
idioma Inglés y otro en idioma Español. En este trabajo, se presentan resultados de la
extracción automática de los metadatos Palabras clave, Título y Autores, en
documentos en ambos idiomas, los cuales resultan promisorios. Mediante este
asistente se espera ayudar al usuario en el proceso de carga de objetos digitales
educativos disminuyendo así su trabajo, y mejorando la cantidad y la calidad de los
metadatos cargados.In this work it is proposed to facilitate the self-archiving of their digital objects to the user.
educational in an institutional repository. For this, the load flow is modified
standard of the DSpace platform, proposing a new flow for the deposit of
objects so that a metadata extractor can be integrated into this process. I know
presents an open architecture of an automatic extractor module of some
document metadata. This automatically extracted metadata is then
validated by the user in the object description process. To design the
extractor, different extraction tools were analyzed and the
combination that gave better results. This module has been designed to
to be able to integrate other extractor tools. A prototype has been developed in JAVA
of this assistant and it has been experimented on two corpus of documents, one in
English language and one in Spanish language. In this work, results of the
automatic extraction of metadata Keywords, Title and Authors, in
documents in both languages, which are promising. Through this
wizard is expected to help the user in the process of uploading digital objects
education, thus reducing their work, and improving the quantity and quality of
uploaded metadata
Tópicos Avanzados de Bases de Datos
No full textEl objetivo de este libro es presentar a los estudiantes una introducción a las nuevas tendencias
en bases de datos soportadas por la evolución de la tecnología informática, que contemplan la
gestión de nuevos tipos de datos.
La propuesta está dirigida a segundas asignaturas de Bases de Datos y cubre temas tales
como la gestión de bases de datos no SQL, datos temporales, datos espaciales, datos en la web,
la recuperación de información documental, la creación de repositorios para ayudar a la toma de
decisiones, incluyendo una introducción a técnicas y herramientas para analizar estos datos.Fil: Bender, Cristina Marta. Universidad Nacional de Rosario, Facultad de Ciencias Exactas, Ingeniería y Agrimensura. Rosario; ArgentinaFil: Deco, Claudia. Universidad Nacional de Rosario, Facultad de Ciencias Exactas, Ingeniería y Agrimensura. Rosario; Argentin
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Mejora de la recuperación de información en bases de datos de texto utilizando recursos lingüísticos
Full text linkAl convertirse la web en el mayor repositorio de conocimiento y en un medio
de publicación fácilmente accesible para todos, la Recuperación de Información ha
dejado de ser un campo exclusivo de los especialistas en Ciencias de la Información
y ha pasado a ser un campo relacionado con cualquier persona. El maximizar la
cantidad de documentos relevantes obtenidos para una consulta depende de la
destreza de este especialista para preparar una estrategia de búsqueda adecuada. Si
bien los usuarios no tienen por qué conocer técnicas de recuperación de información,
la propuesta de esta tesis es mejorar los resultados de su búsqueda por medio de un
“especialista” que implementa estas técnicas.
Se propone el refinamiento semántico de los conceptos de la consulta a fin de
mejorar la precisión de los resultados, utilizando recursos lingüísticos para construir
una estrategia de búsqueda adecuada. El refinamiento semántico propuesto consiste
en: guiar al usuario para desambiguar los conceptos ingresados por él, permitirle
seleccionar conceptos jerárquicamente relacionados a fin de precisar los documentos
a recuperar, y expandir semánticamente los conceptos a fin de aumentar la cantidad
de documentos a recuperar. Los recursos lingüísticos que pueden utilizarse son
tesauros, diccionarios, diccionarios multilinguales y ontologías. Qué recursos
utilizar, depende del área del conocimiento de la consulta y de los recursos
disponibles para ese área.
Se evalúa el refinamiento semántico, eligiendo el recurso WordNet para
consultas de dominio general y el recurso MeSH, especializado en el área salud, para
las consultas en un dominio específico. Las experiencias realizadas muestran que
aumenta la precisión de los resultados en un 19,03 % en el dominio general y en un
33,50 % en un dominio específico del conocimiento.
Otro aspecto tratado es la inmersión del refinamiento semántico en un motor
de búsqueda propio de un sitio web y en sistemas de recomendación. Los resultados
experimentales muestran que el uso del refinamiento mejora las prestaciones del
motor de búsqueda del sitio, con respecto a su uso en su forma estándar, obteniéndose un incremento cercano al 33% en la precisión y duplicando
aproximadamente la cantidad de documentos recuperados. Para la inclusión del
refinamiento en sistemas de recomendación se elige el área educación, planteando el
agregado de la personalización de los resultados utilizando metadatos del usuario y
metadatos de los documentos. De esta forma se potencia la recuperación obtenida del
refinamiento semántico porque se ordenan los resultados de distinta forma según el
usuario y el momento en que éste haya realizado la consulta.As the Web has become one of the biggest repository of knowledge easily
accessible for everyone, the Information Retrieval has stopped to be an exclusive
field of information sciences specialists, and it has become a field related with any
person. Although users do not have to know information retrieval techniques, the
proposal of this thesis is to improve query results by using a "specialist" that
implements these techniques. For this, a semantic refinement is proposed. This
semantic refinement acts as a specialist in information sciences and prepares, using
linguistic resources, an appropriate search strategy that represents the user’s
information need. The semantic refinement consists on three steps. First, it guides the
user in the disambiguation of the words submitted by him. Then, it allows the user to
select concepts hierarchically related in order to reduce the amount of documents to
retrieve. Finally, it expands semantically concepts to increase the amount of
documents to be retrieved. Linguistic resources that can be used are thesauri,
dictionaries, multilingual dictionaries and ontologies. What resources are used,
depends on the domain of knowledge, and on resources available for that domain.
Semantic refinement is evaluated by using WordNet as a linguistic resource
for information retrieval in a general domain knowledge. Also, it was evaluated in a
specific domain, by using MeSH, as a linguistic resource for health. Experimental
results show that precision increases in a 19.03% in a general domain, and in a
33.50% in a specific domain of knowledge. Semantic Refinement was also applied in
a website's search engine. Experimental results show that the refinement improves
the performance of the site's search engine in almost 33% in precision and
approximately doubles the number of documents retrieved. Another issue addressed
in this thesis, is the immersion of the proposed refinement, in an recommender
system of educational materials for a personalized retrieval. Personalization consists
in ordering the results according to the user’s profile depending on his/her
preferences. The use of the refinement inside the recommender system improves the
semantic search, and because of this the recommendation will be improved.Fil: Deco, Claudia. Facultad de Ciencias Exactas, Ingeniería y Agrimensura. Escuela de Ingeniería Electrónica. Departamento de Sistemas e Informática. Universidad Nacional de Rosario; Argentin
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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