Abstract-Link quality estimation has been an active area of research within the wireless sensor network community. It is now well known that the estimation of reliable links requires few sample packets -less than 10, while the estimation of unreliable links require many more -above 50. In scenarios where unreliable links are ubiquitous, and a rapid transfer of data is needed, traditional estimation techniques are not a viable option. In such scenarios, it is instead sufficient to identify the best link available at any given time. Within this context, we propose Link Quality Ranking (LQR), a mechanism that identifies the best link available when only unreliable links are present. Our testbed results indicate that with one sample packet, the delivery rate of LQR -with respect to the best link available-is above 93%. With 10 sample packets, the performance is above 96%.

There have been many studies of computer based text reading. However, only a few have considered text integrated with video and 3D graphics. This paper presents an investigation into the effects of varying (a) text drawing style (plain, billboard, Anti-Interference, shadow), (b) image polarity (positive and negative), and (c) background style (video and 3D) on text readability. Reading speed and accuracy were measured and subjective views of participants recorded.Results showed that: (a) there was little difference in reading performance for the video and 3D backgrounds; (b) the negative presentation outperformed the positive presentation; (c) the billboard drawing styles supported the best performance; subjective comments showed a preference for the billboard style. We therefore suggest, for reading tasks, that designers of interfaces for games, video, and augmented reality provide billboard style to maximize readability for the widest range of applications.

The early Web was hailed for being easy to use, and what is more important, giving people a chance to participate in its growth. The Web3D was believed to have potential to be the next step in the Web's evolution, since it could benefit from graphics hardware and provide users with new and exciting experiences. Nevertheless, Virtual Reality Markup Language (VRML), the first Web3D standard, and its successor X3D, did not generate commercial success. These languages were excessively complex for average Internet users.In this paper, we propose 2LIPGarden, a 3D Hypermedia publishing framework that lets individuals who only know basic HTML -those same enthusiasts who could write pages for the early Web -create simple, easy to use yet interactive 3D web pages. Our framework builds upon 2-Layer Interface Paradigm (2LIP), an attempt to marry advantages of 3D experience with the advantages of narrative structure of hypertext. We introduce clink to HTML, a new type of hyperlink, which connects text with its 3D visualization.