96,266 research outputs found

    Improving Screencast Accessibility for People with Disabilities: Guidelines and Techniques

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    Screencast video tutorials are increasingly popular in libraries, but may present access problems for people with disabilities unless specific accessibility features are added during screencast creation. This article reviews existing standards for accessible web-based multimedia and gives guidelines on how to create accessible screencasts based on these standards

    Towards the 3D Web with Open Simulator

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    Continuing advances and reduced costs in computational power, graphics processors and network bandwidth have led to 3D immersive multi-user virtual worlds becoming increasingly accessible while offering an improved and engaging Quality of Experience. At the same time the functionality of the World Wide Web continues to expand alongside the computing infrastructure it runs on and pages can now routinely accommodate many forms of interactive multimedia components as standard features - streaming video for example. Inevitably there is an emerging expectation that the Web will expand further to incorporate immersive 3D environments. This is exciting because humans are well adapted to operating in 3D environments and it is challenging because existing software and skill sets are focused around competencies in 2D Web applications. Open Simulator (OpenSim) is a freely available open source tool-kit that empowers users to create and deploy their own 3D environments in the same way that anyone can create and deploy a Web site. Its characteristics can be seen as a set of references as to how the 3D Web could be instantiated. This paper describes experiments carried out with OpenSim to better understand network and system issues, and presents experience in using OpenSim to develop and deliver applications for education and cultural heritage. Evaluation is based upon observations of these applications in use and measurements of systems both in the lab and in the wild.Postprin

    Is Explicit Congestion Notification usable with UDP?

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    We present initial measurements to determine if ECN is usable with UDP traffic in the public Internet. This is interesting because ECN is part of current IETF proposals for congestion control of UDPbased interactive multimedia, and due to the increasing use of UDP as a substrate on which new transport protocols can be deployed. Using measurements from the author’s homes, their workplace, and cloud servers in each of the nine EC2 regions worldwide, we test reachability of 2500 servers from the public NTP server pool, using ECT(0) and not-ECT marked UDP packets. We show that an average of 98.97% of the NTP servers that are reachable using not-ECT marked packets are also reachable using ECT(0) marked UDP packets, and that ~98% of network hops pass ECT(0) marked packets without clearing the ECT bits. We compare reachability of the same hosts using ECN with TCP, finding that 82.0% of those reachable with TCP can successfully negotiate and use ECN. Our findings suggest that ECN is broadly usable with UDP traffic, and that support for use of ECN with TCP has increased

    Satellite Footprint

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    How Well Do Ontario Library Web Sites Meet New Accessibility Requirements?

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    New changes to Ontario law will require library web sites to comply with the Web Content Accessibility Guidelines, version 2.0 (WCAG 2.0). This study evaluates 64 Ontario university, college, and public library web sites to see how well they comply with WCAG 2.0 guidelines at present. An average of 14.75 accessibility problems were found per web page. The most common problems included invalid html, poor color contrast, incorrect form controls and labels, missing alt text, bad link text, improper use of headings, using html to format pages, using absolute units of measure, and issues with tables and embedded objects

    A survey of UK university web management: staffing, systems and issues

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    Purpose: The purpose of the paper is to summarize the findings of a survey of UK universities about how their web site is managed and resourced, which technologies are in use and what are seen as the main issues and priorities. Methodology/approach: The paper is based on a web based questionnaire distributed in summer 2006, and which received 104 usable responses from 87 insitutions. Findings: The survey showed that some web teams were based in IT and some in external relations, yet in both cases the site typically served internal and external audiences. The role of web manager is partly management of resources, time and people, partly about marketing and liaison and partly also concerned with more technical aspects including interface design and HTML. But it is a diverse role with a wide spread of responsibilities. On the whole web teams were relatively small. Three quarters of responding institutions had a CMS, but specific systems in use were diverse. 60% had a portal. There was evidence of increasing use of blogs and wikis. The key driver for the web site is student recruitment, with instituitional reputation and information to stakeholders also being important. The biggest perceived weaknesses were maintaining consistency with devolved content creation and currency of content; lack of resourcing a key threat while comprehensiveness was a key strength. Current and wished for projects pointed again to the diversity of the sector. Research implications/limitations: The lack of comparative data and difficulties of interpreting responses to closed questions where respondents could have quite different status (partly reflecting divergent patterns of governance of the web across the sector) create issues with the reliability of the research. Practical implications: Data about resourcing of web management, technology in use etc at comparable institutions is invaluable for practitioners in their efforts to gain resource in their own context. Originality/value of paper: The paper adds more systematic, current data to our limited knowledge about how university web sites are managed

    Mobile recommender apps with privacy management for accessible and usable technologies

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    The paper presents the preliminary results of an ongoing survey of the use of computers and mobile devices, interest in recommender apps and knowledge and concerns about privacy issues amongst English and Italian speaking disabled people. Participants were found to be regular users of computers and mobile devices for a range of applications. They were interested in recommender apps for household items, computer software and apps that met their accessibility and other requirements. They showed greater concerns about controlling access to personal data of different types than this data being retained by the computer or mobile device. They were also willing to make tradeoffs to improve device performance
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