Paul D. Wiedemeier

Large file transmissions over high delay data communication channels using tcp

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A web-based restriction endonuclease tool for mycobacteriophage cluster prediction

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Transmitting Medical Imagery over 2-Meter Amateur Packet Radio Networks using TCP Reno and UDP

A recent explosion in the amount of genomic data has revealed a large genetic diversity in the bacteriophages that infect Mycobacterium smegmatis. In an effort to assess the novelty of newly described mycobacteriophage isolates and provide a preliminary determination of their probable cluster assignment prior to full genome sequencing, we have developed a systematic approach that relies on restriction endonuclease analysis. We demonstrate that a web‐based tool, the Phage Enzyme Tool (or PET), is capable of rapidly facilitating this analysis and exhibits reliability in the putative placement of mycobacteriophages into specific clusters of previously sequenced phages. We propose that this tool represents a useful analytical step in the initial study of phage genomes and that this tool will increase the efficiency of phage genome characterization and enhance the educational activities involving mycobacteriophage discovery.

Improved Near-Earth Internet Data Transmission Using New Multi-Layer OSI Protocol Designs

The United States Federal Communications Commission permits licensed amateur radio operators to transmit data using the 144.1 MHz - 148.0 MHz radio frequencies that comprise the amateur 2-meter band. Unfortunately, significant time is needed to transmit large files over 2-meter amateur packet radio networks because the required terminal node controllers (i.e. radio modems) transmit data at a standard rate of 1200 bps. In this paper, we evaluate the performance of the Reno variant of the transmission control protocol and the user datagram protocol when both are used to transmit medical imagery over ns-2 simulated 2-meter amateur packet radio networks. Specifically, we obtain file transmission times while varying protocol segment sizes and channel bit error rates, and find that smaller segment sizes are best for transmitting medical imagery when the bit error rate increases. We also discuss image quality measures as they relate to medical imagery transmitted using the user datagram protocol.

Rural telemedicine: satellites and fiber optics.

This paper presents the designs for new multilayer open systems interconnect protocols that improve Internet data transmission within a hybrid communication network consisting of a geo-stationary earth orbit satellite and a terrestrial channel. These new designs span the transport, network, and data-link open systems interconnect layers and decrease the time required to transmit large data sets over a hybrid communication network compared to the transmission control protocol variant Reno and frequency division multiplexing over a geo-stationary earth orbit satellite. This paper outlines the functional details for these news designs, provides simulated data transmission performance characteristics for all designs, and concludes with justifications for and benefits related to our research.