The FAA Alternative Positioning Navigation and Timing (APNT) effort is developing technologies to provide navigation service capable of sustaining operations in the event of the loss of Global Navigation Satellite Systems (GNSS). APNT will utilize existing ground infrastructure to support this capability. One effort is to examine the use of the Automatic Dependent Surveillance Broadcast (ADSB) ...

the air transport industry is seeking to manage risks in air travels. its main objective is to detect abnormal behaviors in various flight conditions. the current methods have some limitations and are based on studying the risks and measuring the effective parameters. these parameters do not remove the dependency of a flight process on the time and human decisions. in this paper, we used an hmm...

Although pressure-induced solid-state transformations are important in both geology and materials science, they are difficult to understand at a fundamental level because their kinetics can be highly inhomogeneous, and the role of defects can make transition cycles irreproducible. Jacobs et al. (p. 1803) tackled this problem by shrinking the sample size to increase homogeneity and eliminate def...

In recent years various models for packet traffic in networks have been developed. Most models have used Poisson-like sources which replicate traffic that is voice type. Such sources are said to be short-range-dependent (SRD). The early models of Solé and Valverde demonstrated that longrange-dependent (LRD) traffic could arise in the queue length dynamics at a given node within a communications...

In this paper, we construct a matrix, which transforms a generalized C-Bézier basis into a generalized uniform algebraic-trigonometric B-spline (C-B-spline or UAT B-spline) basis. We also show that it is a totally positive matrix and give a normalized B-basis of the generalized UAT B-splines.  2005 Elsevier B.V. All rights reserved.

a r t i c l e i n f o a b s t r a c t The closer proximity between airports and residential areas has created a growing attention regarding noise pollution. The noise abatement procedures established by the aeronautical authorities and the models for computing noise contours around airports are proof of that. There are also models for identifying aircraft taking off which have focused on the co...