Structure from stereo by associative learning of the constraints.

A computational model of structure from stereo that develops smoothness constraints naturally by associative learning of a large number of example mappings from disparity data to surface depth data is proposed. Banks of disparity-selective graded response units at all spatial locations in the visual field were the input data. These cells responded to matches of luminance change at convergent, divergent, or zero offsets in the left and right 'retina' samples.

Associative learning of scene parameters from images.

An important problem for both biological and machine vision is the construction of scene representations from 2-D image data that are useful for recognition. One problem is that there can be more than one world out there giving rise to the image data at hand. Additional constraints regarding the nature of the environment have to be used to narrow the range of solutions.

The role of frequency versus informational cues in uncertain frequency detection.

The role of frequency and informational cues in the detection of tones of uncertain frequency was investigated using the probe-signal method [G.Z. Greenberg and W.

Negotiating cooperative agreements between health organizations.

Comprehensive care and continuity of care are often dependent upon cooperation and coordination between organizations. Nursing administrators who understand the process through which cooperative agreements between health care organizations are negotiated can plan, direct, and monitor the process. This article covers four major aspects of the negotiations process and their implications for nursing administrators.

Preparation of granulocyte-poor red blood cells by microaggregate filtration: a simplified method to minimize febrile transfusion reactions.

A simple, effective method for removing granulocytes from stored blood is described. Microaggregate filtration removes approximately 95% of the granulocytes from blood which has been stored for 2 weeks, centrifuged and filtered. The mean number of remaining leukocytes is 8 +/- 3.

Elevation of guanosine 3',5'-cyclic phosphate in rat heart after perfusion with acetylcholine.

The levels of guanosine 3',5'-cyclic phosphate (cGMP) and adenosine 3',5'-cyclic phosphate (cAMP) were measured in rat hearts after perfusion with acetylcholine to determine if parallel or independent changes occurred in the levels of these two cyclic nucleotides. It was found that after perfusion with the cholinergic agent tissue, cGMP levels increased as much as 140%. This was accompanied by no change or slight decreases in cardiac cAMP concentrations.