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One of the main approaches for creating metadata for learn- ing resources in adaptive e-learning systems has been through the use of semantic web ontologies. This approach is limiting because it doesn’t usu- ally address a requirement for the support of annotators or the require- ment for signific...
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In this paper we prove a lower bound for the maximum state complexity of Deterministic Finite Cover Automata (DFCAs) obtained from Non-deterministic Finite Automata (NFAs) of a given state complexity n, in case of a binary alphabet. We show, for binary alphabets, that the difference between maximum ...
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Many web - based information - seeking tasks are set in a social context where other people’s knowledge and advi ce improves success in finding information. However, when tightly - knit contacts (friends, family, colleagues) are not available, information seeking becomes more difficult. Inspired b...
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When searching for information, people often seek help from others. However, while people can benefit from communicating with others, they can usually satisfy their information needs, to some degree, without help. Because establishing explicit collaborations...
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Guidelines for designing information charts (such as bar charts) often state that the presentation should reduce or remove 'chart junk' - visual embellishments that are not essential to understanding the data. In contrast, some popular chart designers wrap the presented data in detaile...
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Regex are used in many programs such as Perl, Awk, Python, egrep, vi, emacs etc. It is known that regex are different from regular expressions. In this paper, we give regex a formal treatment. We make a distinction between regex and extended regex; while regex present regular languages, extended reg...
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Collaborative tagging is a simple and effective method for organizing and sharing web resources using human created metadata. It has arisen out of the need for an efficient method of personal organization, as the number of digital resources in everyday lives increases. While tagging has become a...
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This paper presents the Open Annotation and Tagging System (OATS) which draws on previous work in social navigation support, web annotations systems, collaborative tagging and educational metadata. The OATS system augments the text highlighting metaphor by providing a “collaborative tagging” and...
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Users of social bookmarking systems take advantage of pivot browsing, an interaction technique allowing them to easily refine lists of bookmarks through the selection of filter terms. However, social bookmarking systems use one-size-fits-all ranking metrics to order refined lists. These generic ...
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We present a fast incremental algorithm for constructing minimal DFCA for a given language. Since it was shown that the DFCA for a language L can have less states than the DFA for L, this technique seen-is to be the best choice for incrementally building the automaton for a large language, especiall...
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One of the main obstacles for wider adoption of semantic rich e-learning systems is the difficulty in creating and maintaining domain ontologies describing courses. Annotations, such as those resulting from collaborative tagging, provide a new source of information which can be used to ease the ...
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Interactive systems often require calibration to ensure that input and output are optimally configured. Without calibration, user performance can degrade (e.g., if an input device is not adjusted for the user's abilities), errors can increase (e.g., if color spaces are not matched), and som...
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he social semantic Web has recently emerged as a paradigm in which ontologies (aimed at defining, structuring and sharing information) and collaborative software (used for creating and sharing knowledge) have been merged together. Ontologies provide an effective means of capturing and integratin...
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In games where skills such as targeting are critical to winning, it is difficult for players with different skill levels to have a competitive and engaging experience. Although several mechanisms for accommodating different skill levels have been proposed, traditional approaches can be too obvio...
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Usage data logged from user interactions can be extremely valuable for evaluating software usability. However, instrumenting software to collect usage data is a time-intensive task that often requires technical expertise as well as an understanding of the usability issues to be explored. We have...
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This paper describes work we have done over the past five years in developing e-
learning applications and tools using Semantic Web and Web 2.0 technologies. It does not
provide a comprehensive description of these tools; instead, we focus on the pitfalls we have
encountered and attemp...
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Tag clouds are a popular method for visualizing and linking socially-organized information on websites. Tag clouds represent variables of interest (such as popularity) in the visual appearance of the keywords themselves - using text properties such as font size, weight, or colour. Although tag c...
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Pointing at displays from a distance is becoming a common scenario for controlling computers and entertainment systems. Several devices use direct-pointing methods, where the user points a hand-held device at targets on a screen, but these often suffer from accuracy probl...
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Information seeking on the Web has become a central part of many daily activities. Even though information seeking is extremely common, there are many times when these tasks are unsuccessful, because the information found is less than ideal or the task could have been completed more efficiently. In...
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Finite Deterministic Cover Automata (DFCA) can be obtained from Deterministic Finite Automata (DFA) using the similarity relation-Since the similarity relation is not an equivalence relation, the minimal DFCA for a finite language is usually not unique. We count the number of minimal DFCA that can b...
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Steering and driving tasks – where the user controls a vehicle or other object along a path – are common in many simulations and games. Racing video games have provided users with different views of the visual environment – e.g., overhead, first-person, and third-person views. Although researc...