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The potential benefits of general aviation management at a major airport is examined in this paper. The three general aviation management techniques investigated are volume reduction, runway segregation and time restriction. First, a methodology for analyzing these techniques is discussed. The various effects on each user group are quantified for economic comparison between each management technique attempted. A computer simulation model was used to measure the delay effects. Then, these techniques are applied to Denver Stapleton Airport to measure their effects in present and future scenarios. The results show that the best general aviation management technique is volume restriction. The use of peak‐hour pricing mechanism provided better results than random rejection, particularly if only a small degree of diversion is desired. The construction of a new general aviation runway provided equivalent results to the best technique tested. 相似文献
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Z. Shi I. Legate F. Gu J. Fieldhouse A. Ball 《International Journal of Automotive Technology》2010,11(3):363-373
An Antilock Braking System (ABS) is one of the most important safety facilities equipped in modern vehicles. A self-test is
therefore embedded into its ECU to identify any electronic malfunction. However there is no effective method to predict or
check its mechanical conditions routinely to ensure its functionality. Because the ABS system is merely actuated above a particular
speed in emergency stops, the current brake test facilities are not adequate for ABS test. Because of the dangers involved
it would not be acceptable to use a public road to implement such a practice for fault detection so an alternative means must
be sought. To provide a safe and convenient solution this paper proposes a novel method to predict ABS faults whilst the vehicle
is stationary. In this situation a model-based approach is applied to predict various faults from the ABS, especially from
its hydraulic subsystem. As such, a mathematic model is developed to describe the operating processes of ABS including possible
faulty conditions. An autonomous control strategy is also designed to actuate the control module independently without the
knowledge of the control algorithms embedded in an ABS control module. This approach is evaluated through a Simulink simulation. 相似文献
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Reduced private car use can limit greenhouse gas emissions and improve public health. It is unclear, however, how promotion of alternative transport choices can be optimised. A systematic review and meta-analysis was conducted to identify potentially modifiable cognitive mechanisms that have been related to car use and use of alternative transport modes. A qualitative synthesis of measures of potentially modifiable mechanisms based on 43 studies yielded 26 conceptually distinct mechanism categories. Meta-analyses of associations between these mechanisms and car use/non-use generated 205 effects sizes (Pearson’s r) from 35 studies. The strongest correlates of car use were intentions, perceived behavioural control, attitudes and habit. The strongest correlates of alternative transportation choices were intentions, perceived behavioural control and attitudes. Implications for researchers and policy implementation are discussed. 相似文献
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