This paper describes a tool for recombining the logical structure from an XML document with the typeset appearance of the corresponding PDF document. The tool uses the XML representation as a template for the insertion of the logical structure into the existing PDF document, thereby creating a Structured/Tagged PDF. The addition of logical structure adds value to the PDF in three ways: the acce...

The neuropeptide PDF is released by sixteen clock neurons in Drosophila and helps maintain circadian activity rhythms by coordinating a network of approximately 150 neuronal clocks. Whether PDF acts directly on elements of this neural network remains unknown. We address this question by adapting Epac1-camps, a genetically encoded cAMP FRET sensor, for use in the living brain. We find that a sub...

The neuropeptide Pigment-Dispersing Factor (PDF) plays a critical role in mediating circadian control of behavior in Drosophila. Here we identify mutants (groom-of-PDF; gop) that display phase-advanced evening activity and poor free-running rhythmicity, phenocopying pdf mutants. In gop mutants, a spontaneous retrotransposon disrupts a coding exon of a G protein-coupled receptor, CG13758. Disrup...

At least since Schumpeter (1934 and 1942), researchers have been interested in identifying the dimensions of technology regimes that facilitate new firm formation as a mode of technology exploitation. Using data on 1,397 patents assigned to the Massachusetts Institute of Technology during the 1980–1996 period, I show that four hypothesized dimensions of the technology regime—the age of the tech...

This article investigates users’ perceptions of videoconferencing (VC) as a mode of communication in business meetings. The study demonstrates that affordance theory is a fruitful theoretical perspective for understanding what shapes users’ perceptions of how well VC works as a communication technology in business meetings. The article is based on observation and qualitative interviews with VC ...

 The ratio of independent random variables arises in many applied problems. In this article, the distribution of the ratio X/Y is studied, when X and Y are independent Rice random variables. Ratios of such random variable have extensive applications in the analysis of noises of communication systems. The exact forms of probability density function (PDF), cumulative distribution function (CDF) a...

Full Text » PDF » Particle Dark Matter in the Universe: At the Brink of Discovery? Bernard Sadoulet Science 5 January 2007: 61-63. Abstract » Full Text » PDF » Neutrino Astrophysics: A New Tool for Exploring the Universe Eli Waxman Science 5 January 2007: 63-65. Abstract » Full Text » PDF » Neutrino Astrophysics Experiments Beneath the Sea and Ice Francis Halzen Science 5 January 2007: 66-68. A...

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(hyperlinked) The e-mailed (pdf version) of HTB is fully hyperlinked, including contents page and referenced websites The e-mailed (pdf version) of HTB is fully hyperlinked, including contents page and referenced websites The e-mailed (pdf version) of HTB is fully hyperlinked, including contents page and referenced websites The e-mailed (pdf version) of HTB is fully hyperlinked, including conte...