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Mehmet Hadi Gunes – One of the best experts on this subject based on the ideXlab platform.
Dynamic Network of United States Air Transportation at Multiple LevelsComplex Networks XI, 2020Co-Authors: Batyr Charyyev, Mustafa Solmaz, Mehmet Hadi GunesAbstract:
United States Air Transportation contributes to the economy of the country by facilitating the mobility of people and goods. Air Transportation is one of the essential systems in the US and the world. In this study, we investigate the dynamics of US Air Transportation from three angles (i.e., number of flights, number of passengers, and the amount of freight carried) at three levels of Airport, city, and state. While there are unique dynamics at each, there is a strong fluctuation in the activity of the links, indicating a highly dynamic system. Backbone analyses of the networks also show that there are specific periods (such as 2007 for flights, 2008 for freight, and 2012 for passengers) in which network changes drastically.
ASONAM – A Complex Network Analysis of the United States Air Transportation2012 IEEE ACM International Conference on Advances in Social Networks Analysis and Mining, 2012Co-Authors: Dorothy P. Cheung, Mehmet Hadi GunesAbstract:
The Air Transportation industry has a great impact on the economy. In this paper, we analyze the Air Transportation network in the U.S. to better understand its characteristics. For this, we measure several complex network features including average shortest path, degree distribution, assortative mixing, clustering, betweenness centrality, and resiliency. We also analyzed changes over the previous two decades and compared the networks with earlier Air Transportation network studies. In our analysis, we did not observe considerable changes in the analyzed complex network features of the U.S. Air Transportation over the past two decade. Moreover, the U.S. Air Transportation network exhibits small world characteristics and has an assortative mixing by the degree similar to the earlier study on the world-wide Air Transportation network. However, the US Air Transportation network exhibits a partial power law degree distribution unlike the complete power law reported in earlier Air Transportation networks.
R. John Hansman – One of the best experts on this subject based on the ideXlab platform.
The U.S. Air Transportation System, 2007Co-Authors: Aleksandra Mozdzanowska, R. John HansmanAbstract:
The Air Transportation system is currently facing a serious capacity problem. The lack of runway capacity at major Airports limits the number of operations that can be handled by the system. Limited capacity, when combined with increasing demand, will result in congestion that could lead to a collapse of operations due to a propagation of delays through the system. Such a collapse would have a significant impact on the economy given the close coupling between the economy and the Air Transportation system. It will not be easy to expand runway capacity. Most Airports do not have land on which to build new runways and those that do often face local opposition. This opposition comes from communities near the Airport that are opposed to the increases in noise and emissions that would come from added traffic. The growing environmental consciousness adds another constraint to an already difficult problem. The importance of the Air Transportation system to the national economy, both in its direct impacts and its enabling effects, makes it critical that these challenges be addressed so that the system can continue to function and grow.
The Impact of Information Technologies on Air Transportation43rd AIAA Aerospace Sciences Meeting and Exhibit, 2005Co-Authors: R. John HansmanAbstract:
The Air Transportation System and several key subsystems including the Aircraft, Airline, and Air Trmc Management are modeled as interacting control loops. The impact of Information Technologies on each of these subsystems is evaluated through the performance of these control loops. Information technologies are seen to have a significant impact on the safety, efficiency, capability, capacity, environmental impact and financial performance of the Air Transportation System and its components. This growth in traffic has been accompanied by an increase in safety and cost efficiency. The world commercial jet Aircraft fatal or hull loss accident rate decreased by a factor of 5 from 1972 to 2002 and by more than 25 from the entry of commercial jet Aircraft in the early 1960’s.~ Cost efficiency has also increased. The average Cost per Available Seat Mile (CASM) for U.S. Airlines has decreased by over 40% since the late 1970’s.~ It is interesting to note that this period of strong Air Transportation performance correlates with both the deregulation of the U. S Airline Industry in 1978 and the growth in Information Technologies. The commercial introduction of the microprocessor was in 197 1 and the introduction of the Intel 8086 processor (which powered most personal computers) occurred in 1978 (Ref. 4) the year the US Auline industry was deregulated. This paper explores the impact of Information Technologies on Air Transportation and attempts to identify key Information Technology trends emergent issues and future opportunities for Air Transportation. In order to limit it’s scope, this papa will focus primarily on Information Technologies that influence operational closed loop feedback control at various levels. It w~ll not address Information Technologies such as CFD and computational modeling which have had a significant impact on vehicle design.
Nasa – One of the best experts on this subject based on the ideXlab platform.
The Air Transportation/energy system, 2011Co-Authors: NasaAbstract:
The changing pattern of Transportation is discussed, and the energy intensiveness of various modes of Transportation is also analyzed. Sociopsychological data affecting why people travel by Air are presented, along with governmental regulation and Air Transportation economics. The aviation user tax structure is shown in tabular form.
Energy conservation and Air Transportation, 2011Co-Authors: NasaAbstract:
Air Transportation demand and passenger energy demand are discussed, in relation to energy conservation. Alternatives to Air travel are reviewed, along with Airline advertising and ticket pricing. Cargo energy demand and Airline systems efficiency are also examined, as well as fuel conservation techniques. Maximum efficiency of passenger Aircraft, from B-747 to V/STOL to British Concorde, is compared.