PubMed Health⌕ Search

Biomedical subjects

B J Frey

Publications and source records attributed to B J Frey.

4 recordsLinked to original sources
PubMed1995

The "wake-sleep" algorithm for unsupervised neural networks.

An unsupervised learning algorithm for a multilayer network of stochastic neurons is described. Bottom-up "recognition" connections convert the input into representations in successive hidden layers, and top-down "generative" connections reconstruct the representation in one layer from the representation in the layer above. In the "wake" phase, neurons are driven by recognition connections, and generative connections are adapted to increase the probability that they would reconstruct the correct activity vector in the layer below. In the "sleep" phase, neurons are driven by generative connections, and recognition connections are adapted to increase the probability that they would produce the correct activity vector in the layer above.

Algorithms↗
PubMed1986

Blood respiratory properties of the mudsucker fish Labeo capensis (Smith).

For Labeo capensis (Smith) the increase in blood organic phosphates (ATP, GTP) in winter fish exceeds the increase in summer fish. Blood chlorides, blood osmotic pressure, hematocrit and hemoglobin concentration decrease significantly in winter fish when compared to summer fish. Four effectors, viz. temperature, organic phosphates, H+ and Cl-, could lower the oxygen affinity of whole blood, especially in summer fish.

2,3-Diphosphoglycerate↗
PubMed1976

Oral health services: a Delphi technique estimation of their role in adult inpatient rehabilitation programs.

This report presents the results of an investigation into one possible administrative route that would increase the accessibility and availability of dental services for the handicapped. Specifically, this paper assesses the desirability of, perceived level of need for, and feasibility of incorporating a dental service into the total hospital rehabilitation program for adults. The Delphi technique, a method of gathering the opinions of experts through a sequentially designed set of questionnaires, was used to ascertain the views of ten chairpersons of physical medicine and rehabilitation units. The results of this discussion indicate that the perceived need is great, that access to care is difficult, and that a feasible solution would be to establish a hospital-based dental service, preferably convenient to the rehabilitation dormitory, which would provide a full range of dental services.

Administrative Personnel↗