324 resultados para Barre


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Problems in subject access to information organization systems have been under investigation for a long time. Focusing on item-level information discovery and access, researchers have identified a range of subject access problems, including quality and application of metadata, as well as the complexity of user knowledge required for successful subject exploration. While aggregations of digital collections built in the United States and abroad generate collection-level metadata of various levels of granularity and richness, no research has yet focused on the role of collection-level metadata in user interaction with these aggregations. This dissertation research sought to bridge this gap by answering the question How does collection-level metadata mediate scholarly subject access to aggregated digital collections? This goal was achieved using three research methods: in-depth comparative content analysis of collection-level metadata in three large-scale aggregations of cultural heritage digital collections: Opening History, American Memory, and The European Library transaction log analysis of user interactions, with Opening History, and interview and observation data on academic historians interacting with two aggregations: Opening History and American Memory. It was found that subject-based resource discovery is significantly influenced by collection-level metadata richness. The richness includes such components as: 1) describing collections subject matter with mutually-complementary values in different metadata fields, and 2) a variety of collection properties/characteristics encoded in the free-text Description field, including types and genres of objects in a digital collection, as well as topical, geographic and temporal coverage are the most consistently represented collection characteristics in free-text Description fields. Analysis of user interactions with aggregations of digital collections yields a number of interesting findings. Item-level user interactions were found to occur more often than collection-level interactions. Collection browse is initiated more often than search, while subject browse (topical and geographic) is used most often. Majority of collection search queries fall within FRBR Group 3 categories: object, concept, and place. Significantly more object, concept, and corporate body searches and less individual person, event and class of persons searches were observed in collection searches than in item searches. While collection search is most often satisfied by Description and/or Subjects collection metadata fields, it would not retrieve a significant proportion of collection records without controlled-vocabulary subject metadata (Temporal Coverage, Geographic Coverage, Subjects, and Objects), and free-text metadata (the Description field). Observation data shows that collection metadata records in Opening History and American Memory aggregations are often viewed. Transaction log data show a high level of engagement with collection metadata records in Opening History, with the total page views for collections more than 4 times greater than item page views. Scholars observed viewing collection records valued descriptive information on provenance, collection size, types of objects, subjects, geographic coverage, and temporal coverage information. They also considered the structured display of collection metadata in Opening History more useful than the alternative approach taken by other aggregations, such as American Memory, which displays only the free-text Description field to the end-user. The results extend the understanding of the value of collection-level subject metadata, particularly free-text metadata, for the scholarly users of aggregations of digital collections. The analysis of the collection metadata created by three large-scale aggregations provides a better understanding of collection-level metadata application patterns and suggests best practices. This dissertation is also the first empirical research contribution to test the FRBR model as a conceptual and analytic framework for studying collection-level subject access.

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In this volume are represented the proceedings of the Third North American Symposium on Knowledge Organization held at Ryerson University in Toronto Canada on June 16-17, 2011. It contains 21 papers and one abstract.

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Mode of access: Internet.

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Mode of access: Internet.

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The Arctic is affected by global environmental change and also by diverse interests from many economic sectors and industries. Over the last decade, various actors have attempted to explore the options for setting up integrated and comprehensive trans-boundary systems for monitoring and observing these impacts. These Arctic Observation Systems (AOS) contribute to the planning, implementation, monitoring and evaluation of environmental change and responsible social and economic development in the Arctic. The aim of this article is to identify the two-way relationship between AOS and tourism. On the one hand, tourism activities account for diverse changes across a broad spectrum of impact fields. On the other hand, due to its multiple and diverse agents and far-reaching activities, tourism is also well-positioned to collect observational data and participate as an actor in monitoring activities. To accomplish our goals, we provide an inventory of tourism-embedded issues and concerns of interest to AOS from a range of destinations in the circumpolar Arctic region, including Alaska, Arctic Canada, Iceland, Svalbard, the mainland European Arctic and Russia. The article also draws comparisons with the situation in Antarctica. On the basis of a collective analysis provided by members of the International Polar Tourism Research Network from across the polar regions, we conclude that the potential role for tourism in the development and implementation of AOS is significant and has been overlooked.

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Con el fin de la Segunda Guerra Mundial y el escenario que planteaba la Guerra Fra, la manera de entender y explicar la seguridad en la comunidad internacional se ampli, y pas de ser concebida nicamente en trminos polticos y militares, a incluir aspectos como el medio ambiente, la economa y la sociedad. Por esta razn el concepto de seguridad se complejiz dando paso a la construccin de distintas definiciones y debates alrededor de la ampliacin de la agenda de seguridad y los temas que en ella se deban tratar. As pues el fin principal del presente trabajo es el anlisis de un fenmeno socialmente relevante en el marco de las relaciones internacionales como lo es la configuracin de seguridad, a partir de intervenciones de terceros actores que involucran poblaciones afectadas como en el caso somal, la cual enfrent una situacin de crisis como producto de la emergencia de seguridad que se produce en el ao 1991 con la expulsin de Siad Barre del poder. Su importancia radica en la reivindicacin de la trascendencia tanto de los derechos humanos, como de la relevancia del papel de las organizaciones internacionales y de los Estados ms poderosos del Sistema Internacional, en la proteccin de esos derechos y de las comunidades vulnerables que conforman dicho sistema.

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In questa tesi abbiamo presentato/analizzato metodi variazionali allo stato dellarte per la ricostruzione ovvero, rimozione di sfocamento e rumore - di una classe specifica di segnali/immagini caratterizzati dal fatto di essere costanti a tratti e bilivello. Tali metodi ottengono la ricostruzione tramite la minimizzazione di un funzionale formato da due parti: un termine di fedelt ai dati, la cui forma dipende dal tipo di rumore considerato, e un termine di regolarizzazione che codifica linformazione a priori disponibile sul segnale da ricostruire (ad esempio, la sua regolarit). Per segnali costanti a tratti, ben noto che il regolarizzatore deve avere la propriet di promuovere la sparsit delle derivate prime del segnale. In particolare, molte proposte allo stato dellarte sfruttano la pseudo-norma l0 o la norma l1 del gradiente, ossia la Variazione Totale (TV). La prima scelta ottimale in linea teorica poich promuove al meglio la sparsit, ma il funzionale fortemente non convesso e i metodi numerici di minimizzazione possono convergere a soluzioni locali. Nel caso di TV si ha invece un problema convesso che garantisce la convergenza a minimi globali ma la qualit della soluzione sub-ottima. Motivati da vantaggi/svantaggi di l0 ed l1, in questa tesi si deciso di investigare (teoricamente e sperimentalmente) luso di modelli variazionali di tipo Convesso-NonConvesso (CNC). Questi utilizzano particolari regolarizzatori non convessi e parametrici che consentono da un lato di sparsificare meglio di l1, dallaltro di mantenere la convessit del funzionale cos da presentare un unico punto di minimo. Tra i metodi CNC investigati, quello denominato GME-TV basato sul concetto di inviluppo di Moreau generalizzato ha prodotto ricostruzioni di qualit sempre migliore di TV e a volte, diremmo sorprendentemente, anche di l0. Questo rappresenta un risultato di particolare rilevanza scientifica nel campo della ricostruzione di segnali/immagini.

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Questo documento illustra la progettazione e lo sviluppo di unapplicazione Android in ambito aziendale. Lidea stata concepita dallazienda Vettore Rinascimento, la quale richiesta era dimplementare unapplicazione per la gestione di liste di prelievo in magazzini di strutture mediche. Lo scopo di rendere il lavoro manuale pi efficiente e affidabile aumentando cos le prestazioni dei dipendenti. La tesi analizza le fasi tipiche di sviluppo di un software ovvero: lanalisi dei requisiti, la progettazione, la realizzazione e il collaudo. Durante ciascuna fase saranno analizzate anche le scelte progettuali e implementative. La discussione non si limiter al solo sviluppo di unapplicazione mobile: siccome il prodotto sviluppato non sar un software stand-alone, verr anche spiegato il funzionamento del server preesistente e dello sviluppo di unapi per caricare e salvare i dati. Si presenter inoltre il prodotto finale con tutte le sue features, alcune delle pi interessanti sono la sua capacit di funzionare sia online che offline, di adattarsi a ogni tipo di magazzino, previa configurazione, e di poter scannerizzare i codici a barre degli articoli da prelevare con la fotocamera del dispositivo.

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A Sndrome de Guillain-Barr (SGB) uma doena de carter autoimune que acomete primordialmente a mielina da poro proximal dos nervos perifricos de forma aguda/subaguda e a maior causa de paralisia flcida generalizada no mundo. A maioria dos pacientes percebe inicialmente a doena atravs de sensao de parestesias nas extremidades distais dos membros inferiores e, em seguida, superiores.