摘要 :
This Interim Technical Bulletin recommends procedures for conducting Life-Cycle211 Cost Analysis (LCCA) of pavements, provides detailed procedures to determine work 211 zone user costs, and introduces a probabilistic approach to a...
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This Interim Technical Bulletin recommends procedures for conducting Life-Cycle211 Cost Analysis (LCCA) of pavements, provides detailed procedures to determine work 211 zone user costs, and introduces a probabilistic approach to account for the 211 uncertainty associated with LCCA inputs. The Bulletin begins with a discussion of 211 the broad fundamental principles involved in an LCCA. It discusses input 211 parameters and presents simple examples of traditional LCCA in a pavement design 211 setting. It discusses the variability and inherent uncertainty associated with 211 input parameters, and provides recommendation on acceptable ranges for the value 211 of time as well as discount rates. It explores the use of sensitivity analysis in 211 traditional LCCA approaches. User costs are a combination of delay, vehicle 211 operating costs, and crash costs. Each of these cost components is explored and 211 procedures are presented to determine their value. Given the power and 211 sophistication of today's computers and software, simulation techniques such as 211 Monte Carlo are recommended for incorporating variability associated with LCCA 211 inputs into final results.
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摘要 :
This document describes instrument landing system (ILS) math modeling perfomed at the request of the Southwest Region. Data are presented showing the computed performance of a proposed glide slope for runway 13R at the Dallas-Fort...
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This document describes instrument landing system (ILS) math modeling perfomed at the request of the Southwest Region. Data are presented showing the computed performance of a proposed glide slope for runway 13R at the Dallas-Fort Worth Airport, Texas. Model path structure and level run plots are provided for capture effect, null reference, and sideband reference systems installed at a location selected by region engineers. Results indicate that all three system should meet categrory II path structure, linearity, and symmetry tolerances. The capture effect system provides the smoothest glidepath structure of the three systems modeled. (Author)
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