Undergraduate Student
Dept. Computer Science
Drexel University
Researcher
Naval Research Laboratory
Contact
E: aaron.rosenfeld (at) drexel.edu
P: 567 279 1388
My work at NRL and ACIN focuses on improving the reliability of networks on the tactical-edge where there is significant data loss, churn, and latency. Specifically, I focus on the the development, implementation, and testing of epidemic protocols to increase the consistency of data across the network.
I am the lead developer of phpWatch, a free, open-source, web-based service monitoring system written in PHP. It includes features to query web services in a number of different fashions and notify the proper individuals through various means when a service is determined to be offline or malfunctioning. phpWatch has a rich API, allowing developers to create custom query and notificiation methods.
Additional: I published an article on the underlying technology in php|architect in September, 2008. It can be found here.
Demonstration: A working demo can be found here.
Website: phpwatch.net
With a couple of other students, I synthesized a simplified MIPS datapath on a Spartan-3E FPGA. We only implemented a subset of instructions including ADD, ADDI, JMP, and BEQ. The output was a simple 8-bit LED display.
Details: A wiki page detailing the project can be found here.
For a System Architecture course, I developed a history-table branch prediction method for the IF/ID stages of the MIPS pipeline which can greatly reduce the number of flushes needed for conditional jumps.
Details: When a conditional jump instruction enters the IF stage of the pipeline, instead of assuming the branch is not taken, this method uses the history table to lookup if the branch was taken in the past and acts accordingly. Because many conditional branches result in the same jump/no-jump result (e.g. in loops), this can increase the accuracy of preemptive instruction execution.
Schematic: The schematic for implementing such a feature can be found here.