Biological production of hydrogen is poised to become a significant player in the future energy mix. This review highlights recent advances and bottlenecks in various approaches to biohydrogen processes, often in concert with management of organic wastes or waste CO2 . Some key bottlenecks are highlighted in terms of the overall energy balance of the process and highlighting the need for econom...

Usually the offspring-parent fitness correlation is used to visualize and analyze some caracteristics of fitness landscapes such as evolvability. In this paper, we introduce a more general representation of this correlation, the Fitness Cloud (FC). We use the bottleneck metaphor to emphasise fitness levels in landscape that cause local search process to slow down. For a local search heuristic s...

Summa r'y. The number of models for pedestr ian dynamics has grown in the pa.st years, but the experimental data to discriminate between these models is still to a large extent unce rtain and contradictory. To enhance the data base a nd to resolve some discrepancies discussed in the literature over one hundred yean; wc studied the pedestr ian flow through bottlenecks by an experiment performed ...

We propose a scheme within which parallel programs with potential synchronization bottlenecks run e ciently. In the straightforward implementations which use basic locking schemes, the execution time for the program parts with bottlenecks increases signi cantly when the number of processors increases. Our scheme makes the parallel performance for the bottleneck parts of programs close to the se...

This project explores how the ability to ask informative questions changes during development. We hypothesized an intrinsic link between the ability to update beliefs given evidence and the ability to ask informative questions. To study the developmental trajectory of this behavior, five to ten-year-old children played an iPad game asking them to identify a hidden bug. Learners could either ask...

MARATHE, JAYDEEP P. METRIC: Tracking Memory Bottlenecks via Binary Rewriting (Under the direction of Assistant Professor Dr. Frank Mueller). Over recent decades, computing speeds have grown much faster than memory access speeds. This differential rate of improvement between processor speeds and memory speeds has led to an ever-increasing processor-memory gap. Overall computing speeds for for mo...