Jay A. Alexander

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Although neural networks often achieve impressive learning and generalization performance, their internal workings are typically all but impossible to decipher. This characteristic of the networks, their opacity, is one of the disadvantages of connectionism compared to more traditional, rule-oriented approaches to artificial intelligence. Without a thorough(More)
We used bilateral transcranial Doppler to monitor the number of microembolic events (ME) in the left and right middle cerebral arteries of 29 patients during cardiac surgery that required extracorporeal circulation. Based on a previously published study, we hypothesized that the commonly used method of doubling unilateral ME counts to obtain an estimated(More)
The comparative holding strength of cannulated screws (CS) versus solid core screws (SCS) has not been reported, although differences exist in the respective diameters of their outer thread and pilot drill holes. Our objectives were to characterize these differences and determine the holding power of CS compared with SCS in cortical and cancellous bone. The(More)
Homocystinuria usually presents with ectopia lentis, mental retardation, thromboembolic complications, and skeletal abnormalities. Whereas neuropsychiatric abnormalities are often recognized in untreated homocystinuria, initial presentation with acute psychosis has only rarely been reported. We describe a previously well 17-year-old adolescent with an acute(More)
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