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Full-Text Articles in Engineering
Dynamic Characterization Of Aluminum Softball Bats, Danny V. Lee
Dynamic Characterization Of Aluminum Softball Bats, Danny V. Lee
Dissertations and Theses
On January 1, 2000, the Amateur Softball Association of America (ASA) imposed maximum bat performance limitations on commercial softball bats. The ASA adopted a testing standard defined by the American Society of Testing and Materials (ASTM) to determine the bat performance factor (BPF), a normalized coefficient of restitution that must be less than 1.2 for the bat to be eligible for ASA sanctioned events.
The ASTM standard requires that the softball strike the bat, which is free to rotate in the horizontal plane, at 26.8 mfs ± 0.3 mfs (88 ftfs ± 1 ftfs) with little or no spin. The …
Towards Comparative Profiling Of Parallel Applications With Pperfdb, Christian Leland Hansen
Towards Comparative Profiling Of Parallel Applications With Pperfdb, Christian Leland Hansen
Dissertations and Theses
Due to the complex nature of parallel programming, it is difficult to diagnose and solve performance related problems. Knowledge of program behavior is obtained experimentally, with repeated runs of a slightly modified version of the application or the same code in different environments. In these circumstances, comparative performance analysis can provide meaningful insights into the subtle effects of system and code changes on parallel program behavior by highlighting the difference in performance results across executions.
I have designed and implemented modules which extend the PPerfDB performance tool to allow access to existing performance data generated by several commonly used tracing …