In order to understand the dynamic behavior of the variables that can play a major role in the performance improvement in a supply chain, a System Dynamics-based model is proposed. The model provides an effective framework for analyzing different variables affecting supply chain performance. Among different variables, a causal relationship among different variables has been identified. Variable...

Performance modeling has long been considered a difficult science requiring expertise from seasoned capacity planners. Currently there has been a shift in the area of performance modeling towards ease-of-use and automation of the entire process. Automation not only hides this difficult science from the users but also delivers immediate Return on Investment for administrators with deploy and run...

This paper focuses on the characteristics of a model interpreting the effect of training on athletic performance. The model theory is presented both mathematically and graphically. In the model, a systematically quantified impulse of training produces dual responses: fitness and fatigue. In the absence of training, both decay exponentially with time. With repetitive training, these responses sa...

As the modern computing environment expands memory hierarchy from CPU registers and local memory to network storage, the optimal goal of a computer architect becomes to design a memory hierarchy that maximizes the overall design of his machine with a minimal cost. This requires deciding on the number, speed and size of the hierarchical layers. As the gap between processor and memory speed is gr...

Authors: Steven Ashby (LLNL), David H. Bailey (LBNL), Maurice Blackmon (UCAR), Patrick Bohrer (IBM), Kirk Cameron (U. SC), Carleton DeTar (U. Utah), Jack Dongarra (U. Tenn.), Douglas Dwoyer (NASA Langley), Peter Freeman (NSF), Ahmed Gheith (IBM), Brent Gorda (LBNL), Guy Hammer (DOD-MDA), Wesley Felter (IBM), Jeremy Kepner (MIT/LL), David Koester (MITRE), Sally McKee (Cornell), David Nelson (DOE...

Epidemic routing [18] has been proposed as an approach for routing in sparse and/or highly mobile networks in which there may not be a contemporaneous path from source to destination. Epidemic routing adopts a so-called “store-carry-forward” paradigm – a node receiving a packet buffers and carries that packet as it moves, passing the packet on to new nodes that it encounters. Analogous to the s...

This expository article examines the issues that arise when modeling the effect of locking on the performance of transactions in a database system. Perhaps it will interest some performance analysis to see how issues similar to those they have encountered are addressed by others for a different problem; perhaps it will help some graduate student who is about to embark on a modeling project. The...