© Copyright 2006 Texas Digital Library. All Rights Reserved.
Vol 4, No 1 (2003)
Articles
Adaptive Organization of Tabular Data for Display
Tabular representations of information can be organized so that the subject distance between adjacent columns is low, bringing related materials together. In cases where data is available on all topics, the subject distance between table columns and rows can be formally shown to be minimized. A variety of Gray codes may be used for ordering tabular rows and columns. Subject features in the Gray code may be ordered so that the coding system used is one that has a lower inter-column subject distance than with many other codes. Methods by which user preferences may be incorporated are described. The system optionally may display unrequested columns of data that are related to requested data.
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Towards a General Relation Browser: A GUI for Information Architects
The paper presents the case of ongoing efforts to develop and test generalizable user interfaces that provide interactive overviews for large-scale Web sites, portals, and other partitions of Web space. The interfaces are called Relation Browsers (RB) because they help people explore the relationships across different attribute sets, thus enabling understanding the scope and extent of the corpus through active exploration of different "slices" defined by different attribute value juxtapositions. The RB concept is illustrated through discussion of six iterations over a five year period that included laboratory usability studies, a field test, and implementations with a variety of data management problems. The current application to design concepts in a digital government setting is discussed, and the concept of the RB as the basis for an interface server is presented.
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Macro Approaches to Digital Searching and Secondary Research
The use of digital information can be approached from more than one angle. The main emphasis over the past decade has been on making a few basic tools (for instance, browsers and search mechanisms) powerful, versatile and easy to use. Coleman and Oxnam (2002) suggest both improving the usability of current tools and developing new ones. This article suggests focusing on the use of tools for searching digital information. The power of a search mechanism depends not only on how it is constructed but also on how it is used. Coleman and Oxnam ask: "How can interactional digital libraries enhance and augment human capabilities?" I ask a related question: "How can we use current tools such as search mechanisms more effectively?" Coleman and Oxnam wrote their article in the form of a challenge to JoDI readers, authors and researchers in the realm of interactional digital libraries. In a similar spirit, this article can be considered an initial investigation of this question.
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Web Page Layout: A Comparison Between Left- and Right-justified Site Navigation Menus
The usability of two Web page layouts was directly compared: one with the main site navigation menu on the left of the page, and one with the main site navigation menu on the right. Sixty-four participants were divided equally into two groups and assigned to either the left- or the right-hand navigation test condition. Using a stopwatch, the time to complete each of five tasks was measured. The hypothesis that the left-hand navigation would perform significantly faster than the right-hand navigation was not supported. Instead, there was no significant difference in completion times between the two test conditions. This research questions the current leading Web design thought that the main navigation menu should be left justified.
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An Evaluation of Document Keyphrase Sets
Keywords and keyphrases have many useful roles as document surrogates and descriptors, but the manual production of keyphrase metadata for large digital library collections is at best expensive and time-consuming, and at worst logistically impossible. Algorithms for keyphrase extraction like Kea and Extractor produce a set of phrases that are associated with a document. Though these sets are often utilized as a group, keyphrase extraction is usually evaluated by measuring the quality of individual keyphrases. This paper reports an assessment that asks human assessors to rate entire sets of keyphrases produced by Kea, Extractor and document authors. The results provide further evidence that human assessors rate all three sources highly (with some caveats), but show that the relationship between the quality of the phrases in a set and the set as a whole is not always simple. Choosing the best individual phrases will not necessarily produce the best set; combinations of lesser phrases may result in better overall quality.
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Towards a Core Ontology for Information Integration
In this paper, we argue that a core ontology is one of the key building blocks necessary to enable the scalable assimilation of information from diverse sources. A complete and extensible ontology that expresses the basic concepts that are common across a variety of domains and can provide the basis for specialization into domain-specific concepts and vocabularies, is essential for well-defined mappings between domain-specific knowledge representations (i.e. metadata vocabularies) and the subsequent building of a variety of services such as cross-domain searching, browsing, data mining and knowledge extraction. This paper describes the results of a series of three workshops held in 2001 and 2002 which brought together representatives from the cultural heritage and digital library communities with the goal of harmonizing their knowledge perspectives and producing a core ontology. The knowledge perspectives of these two communities were represented by the CIDOC/CRM [31], an ontology for information exchange in the cultural heritage and museum community, and the ABC ontology [33], a model for the exchange and integration of digital library information. This paper describes the mediation process between these two different knowledge biases and the results of this mediation - the harmonization of the ABC and CIDOC/CRM ontologies, which we believe may provide a useful basis for information integration in the wider scope of the involved communities.
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