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  • Mobility and traffic research  (2)
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  • Mobility and traffic research  (2)
  • 1
    Online Resource
    Online Resource
    SAGE Publications ; 2007
    In:  Transportation Research Record: Journal of the Transportation Research Board Vol. 2007, No. 1 ( 2007-01), p. 111-116
    In: Transportation Research Record: Journal of the Transportation Research Board, SAGE Publications, Vol. 2007, No. 1 ( 2007-01), p. 111-116
    Abstract: According to the U.S. National Transportation Safety Board, from 1989 to 1992, situation awareness (SA) was a major factor causing 80% of all aircraft accidents in scheduled airlines. Therefore, the prevention of accidents through effective training in SA became a pivot in aviation safety. During the past 10 years, since all helicopter accidents in South Korea were caused by factors related to SA, an appropriate counter-measure was required. A study used survey data to examine various factors related to SA that could affect helicopter pilots. Recognition of and countermeasures for those factors in emergency situations were analyzed. The results show that although factors associated with SA and vigilance have lower correlations with each other, factors associated with recognition, diagnosis, and generation and implementation of solutions have higher correlations with each other. Thus, the results demonstrate the need for better SA through educational training. Also, there were no significant differences among factors related to proficiency, procedure, acquaintance, anticipation, and comprehension between instructor pilots and copilots. However, there were significant differences regarding mentality, position information, experience, and preparation. These results highlight the differences between instructor pilots and copilots derived from the acquisition of knowledge and flying experience.
    Type of Medium: Online Resource
    ISSN: 0361-1981 , 2169-4052
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2007
    detail.hit.zdb_id: 2403378-9
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  • 2
    Online Resource
    Online Resource
    SAGE Publications ; 2001
    In:  Transportation Research Record: Journal of the Transportation Research Board Vol. 1757, No. 1 ( 2001-01), p. 137-147
    In: Transportation Research Record: Journal of the Transportation Research Board, SAGE Publications, Vol. 1757, No. 1 ( 2001-01), p. 137-147
    Abstract: To allow vehicles to stop in a reasonable distance, adequate friction resistance is needed to prevent pavement slipperiness. In stone-masticasphalt surfaces, friction resistance is mainly caused by the interaction between aggregates exposed at the surface and vehicle tires. Performance of aggregates is reduced with time through wear and polishing by vehicular traffic. A method to investigate aggregate performance using physical, chemical, and petrographic factors was evaluated. The objective was to develop a laboratory test for Indiana dolomite, limestone, sandstone, and gravel aggregates to predict field friction resistance and to determine causes for the range of polish resistance of these aggregates. Dolomite and slag are specified aggregates for wearing surfaces for high-traffic roads in Indiana, but some limestones and crushed gravels may prove acceptable. Gravel sources were assessed on the basis of percentages of rock types included in the gravel. Initial friction values and polished values were determined in the laboratory using the British wheel and pendulum procedures, and field values were determined with the towed friction trailer (ASTM E274-97; average friction numbers), which yielded friction number smooth (smooth tire) and friction number ribbed (ribbed tire). Correlations between parameters predict friction resistance from laboratory test data. Also polished values of 25 may be equivalent to a friction number smooth of 27.7 and friction number ribbed of 30.7. Further refinement is required to establish performance specifications for individual aggregate selection.
    Type of Medium: Online Resource
    ISSN: 0361-1981 , 2169-4052
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2001
    detail.hit.zdb_id: 2403378-9
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
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