Danforth E. Ball

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Can we trust the new AAS to deliver highly dependable air traffic control services until the year 2000? Yes, systematic application of fault tolerance offers a solid promise of success. T he Advanced Automation System, or AAS, will provide automation T services to both en-route and terminal air traffic controllers throughout the United States. Although(More)
This study examined the relationships between plasma and saliva concentrations of phenytoin and 5-(4-hydroxyphenyl)-5-phenylhydantoin (HPPH), the major metabolite of phenytoin in man, and the prevalence and severity of gingival overgrowth. Thirty-six adult epileptic patients who had been receiving phenytoin for greater than 6 months without a recent change(More)
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