1,721,063 research outputs found
Open Metadata Registry (NSDL Registry)
No full textEl Metadata Registry proporciona servicios a los desarrolladores y consumidores de vocabularios controlados y es uno de los primeros despliegues de producción de la comunidad SKOS basado en la web semántica de RDF.National Science Digital Librar
The National Science Digital Library
Get PDFCílem této eseje do předmětu PV070 - Digitální knihovny je představení
digitální knihovny s názvem The National Science Digital Library (český
překlad Národně-přírodovědecká digitální knihovna, dále jen NSDL). Tato
knihovna se nachází na doméně http://nsdl.org a je spravována Americkou
Národní vědeckou nadací.
Práce je rozdělena do několika částí. Zatímco v první části bude
nastíněna stručná charakteristika programu, druhá část se bude zabývat dobou
řešení a aktuálním stavem NSDL. Obsahem třetí části jsou cíle projektu a čtvrtá
část popíše projekt a jeho výsledky. V páté části potom nabídnu vlastní
zhodnocení NSDL a závěrečná šestá část obsahuje metadata v Dublin Core
MatDL.org: The Materials Digital Library and the National Science Digital Library Program
No full textAbstractThe National Science Foundation's National Science Digital Library (NSDL) Program is a premier collective portal of authoritative scientific resources supporting education and research. With funding from NSF, the Materials Digital Library (MatDL) is a collaborative project being developed by the National Institute of Standards and Technology's Materials Science and Engineering Laboratory (NIST/MSEL), the Department of Materials Science and Engineering at the Massachusetts Institute of Technology (MIT), the Department of Chemical Engineering and the Department of Materials Science and Engineering at the University of Michigan (U-M), with Kent State University and University of Colorado at Boulder providing the materials science informatics and workflow technology backbone. As part of the NSDL program, MatDL aims to supports the interface of materials science information and its cognate disciplines, with an emphasis on soft matter. Initial content of MatDL begins with resources selected from NIST/MSEL. Students and faculty in three types of materials science and engineering (MSE) courses at MIT and U-M are taking part in a pilot to use and contribute to MatDL utilizing domain-specific authoring tools. Given the central and interdisciplinary role of materials science in science and engineering, two goals of MatDL are to: 1.) expand its founding partnership with additional participants from the MSE community; and 2.) facilitate the flow of digital materials related knowledge from laboratories where the most recent research discoveries are taking place to the classrooms where new scientists are being trained.</jats:p
An assessment of metadata quality: A case study of the National Science Digital Library Metadata Repository
No full textThe quality of the metadata records in a digital library has a critical effect on its information access and retrieval. The open source Metadata Repository at the National Science Digital Library (NSDL) comprises of collections of metadata submitted from various data providers and is open for harvesting by the public. Since metadata in the repository came from many different data providers, there is a lack of consistency. This lack of consistent hampers the information services provided by the NSDL to its own web users as well as to aggregators who harvest the NSDL data. The goal of this study is to assess the quality of the current metadata records in the NSDL Repository. We harvested over one million Dublin Core metadata records submitted through November 2005 to the repository using the Open Archives Initiative Protocol (OAIP). The data harvested was loaded into an Excel database and exhaustive tabulations of all the Dublin Core metadata fields were performed. The criteria of quality assessment are based on the following areas: consistency, completeness, accuracy and local additions of data providers. This study reports on the results of the tabulations and assessment of metadata quality. Information organizations and institutions will benefit from the results of this study in determining which parts of the repository they aim to harvest. The data collected for this study will be made available to the public to contribute to promoting studies on metadata quality improvement by enabling other researchers to have access to the data for further analysis
Qu'est-ce qu'une bibliothèque numérique, au juste ? Au-delà des fonctions recherche et accès dans la National Science Digital Library
No full textBased on a variety of calibrations11. Bien que les catalogues de ressources numériques aient été introduits de bonne heure dans l'histoire de l'informatique [51] l'emploi généralisé du terme « bibliothèque numérique » remonte au début des années 90 [16] [20]., we are now in the adolescence of digital libraries. Like any adolescence, there is reason for optimism and concern. The concern originates in part from the vexing problems that were addressed in early digital library workshops [8 [8] D. E. Atkins, Report of the Santa Fe Planning Workshop on Distributed Knowledge Work Environments : Digital Libraries, 1997 ., 34 [34] C. A. Lynch and H. Garcia-Molina, "Interoperability, Scaling, and the Digital Libraries Research Agenda," IITA Digital Libraries Workshop May 18-19 1995. href="http://www-diglib.stanford.edu/diglib/pub/reports/iita-dlw/main.html" class="spip_out">http://www-diglib.stanford.edu/diglib/pub/reports/iita-dlw/main.html>.] for which practical solutions have yet to be fully deployed. A few examples are illustrative. While Handles and DOIs88. . have been successfully deployed in the library and publishing communities, the goal of ubiquitous, persistent identifiers remains unmet. Widespread acceptance of Dublin Core and OAI-PMH appears to address initial goals for interoperable resource description. However, problems with the quality of metadata [58 [58] J. Ward, "A Quantitative Analysis of Unqualified Dublin Core Metadata Element Set Usage within Data Providers Registered with the Open Archives Initiative," presented at Joint Conference on Digital Libraries, Houston, 2003.] compromise the utility of the standards. Federated identity middleware such as Shibboleth99. . begins to address authorization and authentication issues, but the underlying public key infrastructure that was seen as "essential to the emergence of digital libraries" [34 [34] C. A. Lynch and H. Garcia-Molina, "Interoperability, Scaling, and the Digital Libraries Research Agenda," IITA Digital Libraries Workshop May 18-19 1995. href="http://www-diglib.stanford.edu/diglib/pub/reports/iita-dlw/main.html" class="spip_out">http://www-diglib.stanford.edu/diglib/pub/reports/iita-dlw/main.html>.] remains undeveloped. Despite efforts of the W3C's Semantic Web initiative [13 [13] T. Berners-Lee, J. Hendler, and O. Lassila, "The Semantic Web," Scientific American, (50), May, 2001.], the holy grail of semantic interoperability [42 [42] A. M. Ouksel and A. Sheth, "Semantic Interoperability in Global Information Systems," SIGMOD Record, 28 (1), 1999.] remains elusive. Finally, with increasing amounts of rich information born in digital form and stored in institutional repositories, we still lack standard, scalable techniques for fully preserving that information.Les bibliothèques numériques, bien que de tailles différentes , vivent à présent leur adolescence. Comme pour toute adolescence, il y a de quoi s'enthousiasmer et se préoccuper. Les préoccupations proviennent en partie de problèmes soulevés lors des premiers ateliers de bibliothèque numérique [8, 34] et pour lesquels des solutions pratiques restent à mettre en oeuvre. Quelques exemples le montrent. Tandis que Handle et DOI ont été déployés avec succès dans les communautés des bibliothèques et de l'édition, l'objectif visant à disposer d'identifiants universels et pérennes n'est toujours pas atteint. L'adoption largement répandue du Dublin Core et de l'OAI-PMH semble répondre aux objectifs initiaux d'une description des ressources qui soit interopérable. Pourtant, des problèmes liés à la qualité des métadonnées [58] compromettent l'utilité des standards. Les logiciels médiateurs d'identité fédérée comme Shibboleth commencent à répondre aux questions d'autorisation et d'identification, mais l'infrastructure à clé publique, considérée comme « essentielle à l'émergence des bibliothèques numériques » [34], n'est pas encore développée. En dépit des efforts produits par l'initiative pour le Web sémantique du W3C [13], le Saint Graal de l'interopérabilité sémantique [42] reste hors de portée. Enfin, face aux volumes croissants d'information sous forme numérique native et stockée dans des entrepôts institutionnels, il nous manque toujours des techniques extensibles et normalisées pour préserver pleinement cette information
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
The National Science Digital Library
Get PDFNSDL je digitálna knižnica založená a prevádzkovaná National Science Foundation (Národnou vedeckou nadáciou). Portál NSDL je dostupný na adrese www.nsdl.org. Knižnica je zameraná na zdroje a kolekcie z oblasti vedy, technológií, inžinierstva, matematiky a výskumu týchto oblastí. Jednou zo základných a nosných myšlienok projektu je sprístupňovať len vysokokvalitné zdroje, teda informačne hodnotné zdroje. Projekt je určený najmä pre študentov a vyučujúcich rôznych kategórií a stupňov vzdelávania, výskumných pracovníkov, ale v konečnom dôsledku aj pre širšiu verejnosť.20
Variations on the Author
Get PDF“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
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