As air traffic continues to grow, the Global Navigation Satellite System (GNSS) plays an increasingly important role in enabling the air space to efficiently handle the increase load. In fact, it will be the primary and often the only system capable of supporting key capabilities for the future airspace. However, GNSS is vulnerable to radio frequency interference (RFI) and spoofing, so an alter...

Abstract The Automatic Dependent Surveillance-Broadcast (ADS-B) system allows aircraft to communicate current state information, including position and velocity messages, other in their vicinity ground stations. Compact Position Reporting (CPR) algorithm is the ADS-B protocol responsible for encoding decoding of positions. CPR sensitive computer arithmetic since it relies on functions that are ...

Automatic-dependent surveillance-broadcast (ADS-B) is a cornerstone of the next-generation digital sky and now mandated in several countries. However, there have been many reports serious security vulnerabilities ADS-B architecture. In this article, we demonstrate evaluate impact multiple cyberattacks on via remote radio frequency links that affected various network, processing, display subsyst...

Automatic dependent surveillance-broadcast (ADS-B) is a key air surveillance technology and critical component of next-generation transportation systems. It significantly simplifies aircraft improves airborne traffic situational awareness. Many types mobile cockpit information systems (MCISs) are based on ADS-B technology. MCIS gives pilots the flight traffic-related they need. has two parts: a...

Tian, Jean Q., and Andrea Quaroni. Involvement of p21(WAF1/Cip1) and p27(Kip1) in intestinal epithelial cell differentiation. Am. J. Physiol. 276 (Cell Physiol. 45): C1245– C1258, 1999.—Using the conditionally immortalized human cell line tsFHI, we have investigated the role of cyclindependent kinase inhibitors (CKIs) in intestinal epithelial cell differentiation. Expression of cyclins, cyclin-...

© 2008 Weller et al. The Rockefeller University Press $30.00 J. Exp. Med. Vol. 205 No. 6 1331-1342 www.jem.org/cgi/doi/10.1084/jem.20071555 1331 In humans, peripheral blood B cells expressing the CD27 marker and mutated Ig receptors are usually considered to be memory B cells generated in germinal centers (GCs) during immune responses to T-dependent (TD) antigens. In adults, approximately half ...

Mammalian D-type cyclins are growth factor-regulated, delayed early response genes that are presumed to control progression through the G1 phase of the cell cycle by governing the activity of cyclin-dependent kinases (cdks). Overexpression of mouse cyclin D1 in serum-stimulated mouse NIH-3T3 and rat-2 fibroblasts increased their rates of G o to Sand GIto S-phase transit by several hours, leadin...