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    <title>Transport Research International Documentation (TRID)</title>
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    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
    <webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster>
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      <title>EFFECTS OF FATIGUE ON BASIC PROCESSES INVOLVED IN HUMAN OPERATOR PERFORMANCE: SIMPLE VIGILANCE AND TARGET DETECTION</title>
      <link>https://trid.trb.org/View/111075</link>
      <description><![CDATA[THE PURPOSE OF THE INVESTIGATION WAS TO DETERMINE THE EFFECTS OF SEVERAL FATIGUE INDUCING SITUATIONS ON PERFORMANCE OF A SIMPLE VISUAL VIGILANCE TASK AND A TARGET DETECTION TASK. SUBJECTS THAT HAD PREVIOUSLY BEEN EXPOSED TO ONE OF THREE FATIGUE CONDITIONS, AS WELL AS NON-FATIGUED CONTROL SUBJECTS, WERE TESTED IN EITHER A VIGILANCE TASK OR TARGET DETECTION TASK. THE FATIGUE CONDITIONS WERE TERMED /A/ MENTAL FATIGUE, IN WHICH SUBJECTS WORKED MENTAL MULTIPLICATION PROBLEMS FOR FOUR HOURS, /B/ DRIVING CONDITION A, IN WHICH SUBJECTS OPERATED A DRIVING SIMULATOR FOR FOUR HOURS, AND /C/ DRIVING CONDITION B, IN WHICH SUBJECTS OPERATED THE DRIVING SIMULATOR AND PERFORMED A VIGILANCE TASK SIMULTANEOUSLY FOR FOUR HOURS. THE CONTROL SUBJECTS WERE EXPOSED TO NONE OF THESE TASKS, BUT WERE TESTED IMEDIATELY UPON REPORTING TO THE LABORATORY. THE VIGILANCE TASK WAS A SIMPLE VISUAL TASK WITH THE SUBJECT REQUIRED TO REPORT THE PRESENCE OF A SMALL FLASH OF LIGHT THAT APPEARED AT IRREGULAR INTERVALS ON A SCREEN. IN THE TARGET DETECTION TASK, THE SUBJECT WAS TO DETECT AND REPORT A CRITICAL TARGET AMONG A BACKGROUND ARRAY OF NON-CRITICAL FIGURES OR TARGETS. RESULTS SHOWED THAT SUBJECTS EXPOSED TO THE FATIGUE CONDITIONS TENDED TO MISS MORE SIGNALS IN THE VIGILANCE TASK THAN DID THE NON-FATIGUED SUBJECTS AND THAT SUBJECTS EXPOSED TO THE MENTAL FATIGUE CONDITION SHOWED THE LARGEST PERFORMANCE DECREMENT. IN THE TARGET DETECTION TASK, FATIGUED SUBJECTS ALSO MADE MORE ERRORS THAN CONTROL SUBJECTS. SUBJECTS EXPOSED TO THE MENTAL FATIGUE CONDITION TENDED TO MAKE MORE ERRORS THAN SUBJECTS EXPOSED TO THE DRIVING CONDITIONS AND THE CONTROL SUBJECTS. /AUTHOR/]]></description>
      <pubDate>Mon, 12 Dec 1994 00:00:00 GMT</pubDate>
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      <title>A MODEL FOR SCHEDULING MAINTENANCE UTILIZING MEASURES OF EQUIPMENT PERFORMANCE</title>
      <link>https://trid.trb.org/View/108670</link>
      <description><![CDATA[A METHOD IS DESCRIBED FOR SCHEDULING PREVENTIVE MAINTENANCE TO MINIMIZE EXPECTED AVERAGE HOURLY MAINTENANCE COST BASED ON A CRITERION OF PERIODICALLY OBSERVING DETERIORATION IN ONE OR MORE EQUIPMENT PERFORMANCE CHARACTERISTICS. THE MATHEMATICAL PROCEDURE REQUIRES EXPRESSING THE DETERIORATION PHENOMENON IN THE FORM OF A SIMPLE MARKOV PROCESS. THE IMPLICATION OF THIS METHOD IS THAT A FORECAST OF EQUIPMENT FAILURE IS BASED ONLY ON EXISTING PERFORMANCE LEVEL AND IS INDEPENDENT OF ANY HISTORY OF PRIOR DETERIORATION RATE. THE CRITERION FOR SCHEDULING PREVENTIVE MAINTENANCE IS EXPRESSED AS A METHOD INVOLVING MATRIX MULTIPLICATION RATHER THAN AS A SIMPLE ALGEBRAIC FORMULA OR A SERIES OF CURVES. THIS WAS NECESSITATED BY THE LARGE NUMBER OF INPUT PARAMETERS CONSISTING OF MAINTENANCE COST PARAMETERS AND A MATRIX OF PROBABILITIES DESCRIPTIVE OF THE DETERIORATION PHENOMENON. HYPOTHETICAL NUMERICAL EXAMPLES ESTABLISHED THE POTENTIAL OF THIS METHOD FOR ACHIEVING REAL SAVING IN MAINTENANCE COST. THE METHOD PROVIDES A SYSTEMATIC SEARCH FOR LEMON EQUIPMENTS, AND, CONVERSELY, PROTECTS AGAINST DISCARDING THOSE EQUIPMENTS WHICH TEND TO MAINTAIN HIGH PERFORMANCE LEVELS OVER EXTENDED PERIODS OF TIME. THE ALGEBRAIC METHOD PROVIDES A TECHNIQUE FOR COLLECTING DETERIORATION DATA IN TERMS OF DISTRIBUTIONS AND NOT JUST AVERAGES. IT WAS APPARENT IN THE NUMERICAL WORK THAT THE UNDERLYING FAILURE DENSITY FUNCTION IS CRITICAL IN DETERMINING THE AMOUNT OF SAVING WHICH CAN BE ACHIEVED BY THIS METHOD. THE COEFFICIENT OF VARIATION IS ESPECIALLY CRITICAL. THE METHOD IS DISTRIBUTION FREE SINCE IT DOES NOT DEPEND ON PRIOR KNOWLEDGE OF THE TIME TO FAILURE DENSITY FUNCTION. THE METHODS OF DATA COLLECTION, DEFINITION OF STATES OR PERFORMANCE LEVELS, AND THE SELECTION OF PROPER TIME INTERVALS PRESENT PECULIAR PROBLEMS WHICH REQUIRE CARE IN THE APPLICATION OF THIS METHOD. /AUTHOR/]]></description>
      <pubDate>Mon, 05 Sep 1994 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/108670</guid>
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    <item>
      <title>100 MILLION CANADIANS: A DEVELOPMENT POLICY FOR CANADA</title>
      <link>https://trid.trb.org/View/63803</link>
      <description><![CDATA[This book is an outline of ideas on the business, political, social and educational aspects of Canada by the author.  It is intended to give a broad view of our present system and suggestions for future improvement.  He looks at the development of Canada under the following headings: the nature of urban communities, transportation, ecological zoning and land use, technological development, natural resources, and 100 million Canadians.]]></description>
      <pubDate>Wed, 27 Apr 1977 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/63803</guid>
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