Results 201 to 210 of about 14,940 (225)
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Estimation of VDL mode 2 with hidden transmitters
2009 IEEE Aerospace conference, 2009The VDL Mode 2 aeronautical data link uses a p-persistent Carrier Sense Multiple Access (CSMA) channel access protocol that, like all CSMA systems, is susceptible to the hidden transmitter condition. Simulations have shown that the impact of hidden transmitters in the aeronautical environment can be significant.
Steven Bretmersky, Rafael Apaza
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Semantically Structured VDL-Based Iconic Tags System
2013Iconic tags system based on Visual Distinctive Language has been developed and assessed improving tagging effectiveness by considering tagging quality and tagging speed. This amelioration benefits from semiotic interpretation of tag meaning and graphical code of tag structure.
Ma, Xiaoyue, Cahier, Jean-Pierre
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Modelling a radiology department service using a VDL integrated approach
Journal of Health Organization and Management, 2009PurposeThe healthcare industry is facing several challenges such as the reduction of costs and quality improvement of the provided services. Engineering studies could be very useful in supporting organizational and management processes. Healthcare service efficiency depends on a strong collaboration between clinical and engineering experts, especially ...
GUGLIELMINO G +3 more
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Comparison of VDL modes in the terminal domain
2004 IEEE Aerospace Conference Proceedings (IEEE Cat. No.04TH8720), 2005In This work we investigate the comparative performance of VDL modes 2, 3 and 4 by simulating mobile aircraft that dynamically establish and disconnect links to the ground station. The principal consideration was to model and simulate realistic data traffic and aircraft traffic patterns in the terminal domain, which in these simulations is the area ...
R.W. Murawski +2 more
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VDL Mode 3 subnet simulation models in OPNET
Gateway to the New Millennium. 18th Digital Avionics Systems Conference. Proceedings (Cat. No.99CH37033), 2003The Very High Frequency (VHF) Digital Link (VDL) Mode 3 is based on a Time Division Multiple Access (TDMA) media access control (MAC) protocol. This MAC protocol incorporates priority queuing, slotted ALOHA, and polling by the ground station to handle channel contention and to achieve the speedy delivery of time critical ATC messages.
P.T.R. Wang, B.T.L. Hung, B.E. Eckstein
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VDL-based iconic co-annotation in crisis management
2014 International Conference on Collaboration Technologies and Systems (CTS), 2014Crisis management is typical collaborative work which requires multi types of actors to cooperate in decision making. Crisis Clever System (CCS) is a decision making environment based on emergency experience feedback and provides situation base for later cases.
Ma, Xiaoyue +3 more
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Comparison of VDL modes in the aeronautical telecommunications network
Proceedings, IEEE Aerospace Conference, 2003VHF digital link (VDL) has been identified as a method of communication between aircraft and ground stations in the aeronautical telecommunications network (ATN). Three different modes of VDL have been suggested for implementation. Simulations were conducted to compare the data transfer capabilities of VDL modes 2, 3, and 4.
S. Bretmersky +2 more
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Evaluation of VDL modes in the en-route domain
The 23rd Digital Avionics Systems Conference (IEEE Cat. No.04CH37576), 2005In this paper we investigate the performance of VDL modes 2,3, and 4 in the en-route domain by simulating mobile aircraft that dynamically establish and disconnect links to the ground station. In simulation one, the aircraft modeled are within a single sector of airspace which is the current boundary for en-route aircraft communication.
R.W. Murawski +2 more
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Definition Einer Programmanalysemaschine in VDL
1978Bevor ein Programm optimiert werden kann, mus zur Ubersetzungszeit Information bestimmt und gesammelt werden. Die Techniken, die zur Bestimmung der Optimierungsinformation verwendet werden, gehen meist von der Darstellung des Programmes als Flusgraph aus [U 75, K 73, AC 76].
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VDL Mode 4/STDMA-a CNS data link
15th DASC. AIAA/IEEE Digital Avionics Systems Conference, 2002At its tenth Air Navigation Conference (1991), the ICAO endorsed the so-called Communication, Navigation, Surveillance/Air Traffic Management concept, CNS/ATM. This concept envisages the use of data link communications, satellite navigation and automatic dependent surveillance (ADS). The Swedish Civil Aviation Administration (SCAA) has been involved in
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