We present experiments exploring why high ability workers join teams with less able coworkers when there are no short-term financial benefits. distinguish between two explanations: prosocial preferences and expected long-term gains from teaching future teammates. Participants perform a real-effort task decide whether to work independently or two-person team. Treatments vary the payment scheme (...

In this paper we experimentally study the performance of main-memory, parallel, multi-core join algorithms, focusing on sort-merge and (radix-)hash join. The relative performance of these two join approaches have been a topic of discussion for a long time. With the advent of modern multicore architectures, it has been argued that sort-merge join is now a better choice than radix-hash join. This...

A digital approach to geometry and topology plays an important role in analyzing n-dimensional digitized images arising in computer graphics as well as in many areas of science including neuroscience, medical imaging, industrial inspection, geoscience and fluid dynamics. Concepts and results of the digital approach are used to specify and justify some important low-level image processing algori...