Browsing by Subject "Digital Library"
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Item Authoring Large and Complex Hypertext with Reusable Components(2011-10-21) Park, Yung AhcaT, a Petri net-based hypertext system, supports the modeling of user characteristics, contextual information, as well as the policies that govern the operation of a digital library within the infrastructure that presents its contents. Traditionally, users have created caT networks from scratch, thus limiting their use to small collections. In this research, we introduce TcAT, a new authoring tool that supports features for component-based authoring, with a view to enable the creation of large caT nets that can represent complex, real-life spaces such as libraries and museums. TcAT supports graphical, template-based creation of nets as well as a textual language for easy manipulation of large structures. It implements composition operations from Petri net theory to select, categorize, and modify existing net fragments as building blocks for composing larger networks. Authors may switch modes between visual and textual authoring at will, thus combining the strengths of expressing large nets textually and selecting net fragments via point-and-click interaction. A user evaluation of the new authoring mechanisms suggests that this is a promising tool for improving the efficiency of experienced users as well as that of novice users, who are unfamiliar with the Petri net formalism.Item Interlinking related diverse media in a digital library(Texas A&M University, 2006-08-16) Singh, Manas SouravaDigital libraries are widely used for organizing and presenting large collections of artifacts. However, as the digital libraries grow in size, it is becoming increasingly difficult for the user to find all the resources related to his topic of interest. It is labor intensive, time consuming and error prone to identify and link related materials manually. Thus it is important to develop automatic techniques to help the user discover and view the related resources that are available in the digital library. We have implemented an automatic interlinking mechanism for a music digital library system that spans across batch, online and on-demand phases. Since the task of generating the related links is resource and time intensive, distributing the whole process across these three phases significantly reduces the runtime overhead and improves the response time. This mechanism allows the system to display very large texts, with keywords identified and hyperlinked, with no perceivable delay to the user. Storing the artifacts in a structured manner and using the structural metadata to generate interlinkages allows us to create these links across diverse media like images, audio files, music scores, texts, etc. The implemented interlinking technique also scales well with a rapidly changing collection. The related links are displayed on demand, using AJAX technology. This allows the user to view these links without leaving the text, thus ensuring minimum disruption and continuity of action. We also have developed a generic interlinking framework which abstracts the domain independent logic for generating and displaying related links. This generic interlinking framework can be used by domain specific digital libraries to support interlinking of related resources.Item Patterns in the daily diary of the 41st president, George Bush(Texas A&M University, 2007-04-25) Kumar, ShreyasThis thesis explores interfaces for locating and comprehending patterns among time-based materials in digital libraries. Time-based digital library materials are like other digital library materials in that they are comprised of data and metadata. In addition, they have a time or period of time attached to each data item. The specific focus of this thesis is on fine-granularity items-items that have relatively little data and cover brief periods of time. In such a context, people often are left to discern patterns of activity by retrospectively making sense of the collection or parts thereof. The specific domain chosen for the implementation is the daily diary of President George Bush, the 41st president of the USA. This project developed a searching and browsing interface, which allows people to study the relationship between activities and people in the library data. As part of this thesis, a corpus of the Presidential daily diary was digitized. Two interfaces were provided to this corpus, one based on a standard information retrieval engine (Greenstone) and another presenting time-based visualizations of data items. An evaluation was conducted to explore the relative strengths and weaknesses of these two interfaces.