We explore time-memory and other tradeoffs for memory-hard functions, which are supposed to impose significant computational and time penalties if less memory is used than intended. We analyze three finalists of the Password Hashing Competition: Catena, which was presented at Asiacrypt 2014, yescrypt and Lyra2. We demonstrate that Catena’s proof of tradeoff resilience is flawed, and attack it w...

The quality of operational processes is an important driver of hospital performance. In particular, processes that reliably deliver both evidence-based and patient-centered care, which we refer to conformance and experiential quality, respectively, have been argued to result in better clinical outcomes. However, hospitals, in general, struggle to perform well on these process quality dimensions...

Excess resource idling can result in cost overruns, while low resource coverage or long lead-time in resource acquisition can delay the project schedule. Therefore, systematically managing this tradeoff is critical to ensure project delivery in time and within budget. In addition, to provide practically useful guidelines and tools, the dynamic construction process needs to be realistically repr...

Once upon a time, I worked for a small startup company. The pay was excellent, but the hours were long and vacation time was limited. I currently work as a college professor, where the pay is not-so-good but the hours and vacation time are excellent. For several years, I also worked for the government, where the pay is reasonably good and the hours and vacation time are reasonably good. So, it ...

Recursive Conditioning, RC, is an any-space algorithm lor exact inference in Bayesian networks, which can trade space for time in increments of the size of a floating point number. This smooth tradeoff' is possible by varying the algorithm's cache size. When RC is run with a constrained cache size, an important problem arises: Which specific results should be cached in order to minimize the run...

This paper presents an activity-based cost model for printed wiring board (PWB) fabrication in which the process steps are defined by material processing activities. The model is designed to be used during system planning and tradeoff analysis prior to physical design. In many activity-based manufacturing cost models, activities are based on equipment and facilities (“equipment-centric”). In th...