Hash algorithms generate a fixed-size output from a variable-size input. Typical algorithms will process every byte of the input to generate their output, which, on a very large input, can be time consuming. The hashes’ potential slowness, coupled with recently reported attacks on the MD5 and SHA-1 hash algorithms, prompted a look at hashing from a different perspective. By generating several “...

Full waveform inversion (FWI) is a nonlinear PDE constrained optimization problem, which seeks to estimate constitutive parameters of medium such as phase velocity, density, and anisotropy, by fitting waveforms. Attenuation an additional parameter that needs be taken into account in viscous media exploit the full potential FWI. more easily implemented frequency domain using complex-valued veloc...

arkinson’s disease (PD) is one of the most common neurodegenerative diseases characterized by tremor, stiffness and slowness of motion due to dopamine (DA) depletion following dramatic loss of dopaminergic neurons in Substantia nigra. Unfortunately, this debilitating disease has no curative treatment. Neuroprotective agents might be useful via postponing the initiation of neurodegenerative proc...

Relevance Models are well known retrieval models and capable of producing competitive results. However, because they use query expansion they can be very slow. We address this slowness by incorporating two variants of locality sensitive hashing (LSH) into the query expansion process. Results on two document collections suggest that we can obtain large reductions in the amount of work, with a sm...

Reflections and refractions from wide-angle, densely sampled, multi channel streamer data are transformed automatically to the slowness-depth domain using a downward continuation algorithm. The method may be used to rapidly obtain velocity functions for use in pre-stack depth migration processes. Incorporation of the reflection data has the potential to produce velocity images in complex geolog...

Sentences using ‘ought’ appear to have some kind of non-descriptive force (e.g. commending, guiding actions, committing the speaker), in which case it would seem that no ‘ought’ statement can follow logically from purely factual statements lacking such force. Yet from factual statements about slowness and liability to breakdown of alternative means of transport it seems possible validly to infe...

Is teaching impaired by gender bias? Following growing academic interest targeting bias in university curricula, we analyse the participation of literatura written women compulsory course Colombian Economic History to inquire about existence field teaching. We two categories: relevance and conclude that investigation subfield reveals existing biases economy a slowness change despite awareness i...