1967 behavioral model of man--his chains revealed. NASA Contract Rep NASA CR-858.

A descriptive model for determining optimal human performance in systems. Volume IV. Final summary report. NASA CR-879.

Evaluation of user reactions to a prototype on-line information retrieval system. NASA CR-918.

Distribution of this report is provided in the interest of information exchange. Responsibility for the contents resides in the author or organization that prepared it. SUMMARY Reactions of a user population (scientists/engineers and librarians) to an operational test of an on-line system for retrieving document citations (RECON) were studied at several NASA facilities. During a two month opera...

Development of a blood-pressure transducer for the temporal artery. NASA CR-293.

This report describes three phases of research on the direct force method of externally measuring arterial blood pressure. First, a miniaturized transducer was designed specifically for application on the superficial temporal artery of man. This device incorporateda differentialtransformer sensing element with special mounting to reduce response to acceleration. Second, a transducer of earlier ...

Effects of time delay in the visual feedback loop of a man-machine system. NASA CR-560.

This Thesis was aimed at studying the effects of time delay in the visual feedback loop of a man-machine system. A one-dimensional, step-type input, pursuit tracking experiment was developed to study these effects with transmission-type delays of zero to ten seconds. Thirty-six subjects participated in a series of tests that covered: seven different delays, two different levels of course comple...

Combination effects of tone and duration parameters on perceived noisiness. NASA CR-1283.