Marjory J. Johnson

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Communication technology now makes it possible to support high data transmission rates at relatively low cost. In particular, optical fiber can be used as the medium in local area networks with data rates in the range of 100 megabits per second. Unfortunately, local area network topologies and communication protocols that work well with lower speed media(More)
Currently there is no control for real-time traffic sources in IP networks. This is a serious problem because real-time traffic can not only congest the network but can also cause unfairness and starvation of TCP traffic. In this paper, a new rate control scheme, RCS, is introduced for real-time traffic in networks with high bandwidth-delay products and(More)
An assay is described for the quantitative detection of excretory/secretory antigens liberated by the intestinal nematode Heligmosomoides polygyrus and voided in the host's faeces. A rabbit polyclonal antiserum to the antigens detected them in a dose-dependent manner and was sufficiently sensitive to recognise infection in mice carrying a mean worm burden(More)
Currently there is no control for real-time traf-c sources in IP networks. This is a serious problem because real-time traac can not only congest the network but can also cause unfairness and starvation of TCP traac. In this paper, a new rate control scheme, RCS, is introduced for real-time traac in networks with high bandwidth-delay products and high bit(More)
This paper describes an experiment to prototype a new way of conducting science by applying networking and distributed computing technologies to an Earth Science application. A combination of satellite, wireless, and terrestrial networking provided geologists at a remote field site with interactive access to supercomputer facilities at two NASA centers,(More)
Development of the Next Generation Internet requires the development of revolutionary applications as well as advances in networking technologies. This paper presents experiences in using the NREN testbed to prototype a collaborative medical-imaging application. Technological requirements for this application include high-bandwidth reliable multicast and(More)