Catálogo de publicaciones - libros

In this paper, we describe a system to perform Document Image Retrieval in Digital Libraries. The system allows users to retrieve digitized pages on the basis of layout similarities and to make textual searches on the documents without relying on OCR. The system is discussed in the context of recent applications of document image retrieval in the field of Digital Libraries. We present the different techniques in a single framework in which the emphasis is put on the representation level at which the similarity between the query and the indexed documents is computed. We also report the results of some recent experiments on the use of layout-based document image retrieval.

For users to trust and interpret the data in scientific digital libraries, they must be able to assess the integrity of those data. Criteria for data integrity vary by context, by scientific problem, by individual, and a variety of other factors. This paper compares technical approaches to data integrity with scientific practices, as a case study in the Center for Embedded Networked Sensing (CENS) in the use of wireless, in-situ sensing for the collection of large scientific data sets. The goal of this research is to identify functional requirements for digital libraries of scientific data that will serve to bridge the gap between current technical approaches to data integrity and existing scientific practices.

Digital library systems are frequently defined with a focus on data collections, traditionally implemented as databases. However, when preservation and widespread access are most critical, some curators are considering how best to build digital library systems without databases. In many instances, XML-based formats are recommended because of many known advantages. This paper discusses the Bleek and Lloyd Collection, where such a solution was adopted. The Bleek and Lloyd Collection is a set of books and drawings that document the language and culture of some Bushman groups in Southern Africa, arguably one of the oldest yet most vulnerable and fragile cultures in the world. Databases were avoided because of the need for multi-OS support, long-term preservation and the use of large collections in remote locations with limited Internet access. While there are many advantages in using XML, scalability concerns are a limiting factor. This paper discusses how many of the scalability problems were overcome, resulting in a viable XML-centric solution for both greater preservation and access.

Users’ personal citation collections reflect users’ interests and thus offer great potential for personalized digital services. We studied 18,120 citations in the personal collections of 96 users of RefWorks citation management system to understand these in terms of their resolvability i.e. how well these citations can be resolved to a unique identifier and to their online sources. While fewer than 4% of citations to articles in Journals and Conferences included a DOI, we were able to increase this resolvability to 50% by using a citation resolver. A much greater percentage of book citations included an ISBN (53%), but using an online resolver found ISBNs for an additional 20% of the book citations. Considering all citation types, we were able to resolve approximately 47% of all citations to either an online source or a unique identifier.

Document triage is the critical point in the information seeking process when the user first decides the relevance of a document to their information need. This complex process is not yet well understood, and subsequently we have undertaken a comparison of this task in both electronic and paper media. The results reveal that in each medium human judgement is influenced by different factors, and confirm some unproven hypotheses. How users claim they perform triage, and what they actually do, are often not the same.

This contribution reports on the introduction of explicit recommender systems at the University Library of Karlsruhe. In March 2006, a rating service and a review service were added to the already existing behavior-based recommender system. Logged-in users can write reviews and rate all library documents (books, journals, multimedia, etc.); reading reviews and inspecting ratings are open to the general public. A role system is implemented that supports the submission of different reviews for the same document from one user to different user groups (students, scientists, etc.). Mechanism design problems like bias and free riding are discussed, to address these problems the introduction of incentive systems is described. Usage statistics are given and the question, which recommender system supports which user needs best, is covered. Summing up, recommender systems are a way to combine the support of library user interaction with information access beyond catalog searches.

In the last few years, a deep paradigm shift has taken place in the Digital Library domain. From several independent online systems and closed library “silos” that store digital heritage content, digital library systems are evolving towards a networked service-based architecture built as a set of fully interoperable local digital library systems.

The countries of Central and Eastern Europe (CEE) that were part of the Soviet Bloc or were non-aligned (Yugoslavia) entered the 1990s with telecommunications penetration of about fifteen telephones per hundred persons and a weak technical infrastructure based on pre-Cold War mechanical switching technology. They lacked digital transmission systems, fiber optics, microwave links, and automated systems control and maintenance. Until 1990, business, government, and education made little use of computers, although some mainframe-based data processing centers handled scientific and military applications. Communication technologies such as typewriters, photocopiers, and facsimile machines were registered and controlled to varying degrees in each country. The CEE countries could not legally make connections between their computer networks and those of countries outside the Soviet Bloc owing to the COCOM regulations and other embargoes imposed on the region by the West, although clandestine network connections were widely known to exist. In the fifteen-plus years since the collapse of the Soviet Bloc, these countries have made rapid advances in infrastructure and economics, and several already have become members of the European Union. Yet many challenges remain, especially with regard to infrastructure maturity, linguistics, and intellectual property.

This paper presents, from e-book features, the concept of as a medium for publishing classic literature in different editions demanded by the Spanish educational system. The electronic work is an entity which, focused in its logical structure, provides a set of interaction services designed by means of , a processing model driven by XML data.

We introduce a model of uncertainty where documents are not uniquely identified in a reference network, and some links may be incorrect. It generalizes the probabilistic approach on databases to graphs, and defines subgraphs with a probability distribution. The answer to a relational query is a distribution of documents, and we study how to approximate the ranking of the most likely documents and quantify the quality of the approximation. The answer to a function query is a distribution of values and we consider the size of the interval of Minimum and Maximum values as a measure for the precision of the answer.