The Experts below are selected from a list of 57528 Experts worldwide ranked by ideXlab platform
Mehmet Hadi Gunes - One of the best experts on this subject based on the ideXlab platform.
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Dynamic Network of United States Air Transportation at Multiple Levels
Complex 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.
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ASONAM - A Complex Network Analysis of the United States Air Transportation
2012 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.
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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.
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The Impact of Information Technologies on Air Transportation
43rd 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.
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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.
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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.
Hakan Oktal - One of the best experts on this subject based on the ideXlab platform.
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Comparison of Air Transportation Systems of Turkey and Spain as the Competitors in Tourism Sector
2017Co-Authors: Hakan Oktal, Lucía Rodríguez GarcíaAbstract:The growth of Air Transportation in a country affects positively the development of other industries especially tourism. Turkey and Spain rank among the top countries in the world with their most developed Air Transportation and tourism sectors. In this study, the similarities and differences of Air Transportation systems of both countries and their dependency on tourism are examined. In this framework, the structure and the development process of Turkish and Spanish Air Transportation is revealed, then the future development trends of Air passenger and Air freight demands are estimated by using trend and regression analyses. Finally, the factors which may accelerate the development of Air Transportation and tourism sectors and the threats against the growth of these sectors are explored. The analysis results show that the tourism is crucial for the development of Air Transportation in both countries.
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REGIONAL Air Transportation IN THE WORLD AND ITS APPLICABILITYIN TURKEY
Anadolu University Journal of Social Sciences, 2007Co-Authors: Hakan Oktal, Hatice KucukonalAbstract:In this study, the concept of regional Air Transportation which shows a rapid growth in the world is defined and its development in the USAand European countries is examined. Then the current situation of Turkish Air Transportation is presented, and some key approaches are suggested to implement regional Air Transportation which is a new concept in Turkey.
Mark Azzam - One of the best experts on this subject based on the ideXlab platform.
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The accelerated growth of the worldwide Air Transportation network
The European Physical Journal Special Topics, 2013Co-Authors: Mark Azzam, Uwe Klingauf, Alexander ZockAbstract:Mobility by means of Air Transportation has a critical impact on the global economy. Especially against the backdrop of further growth and an aggravation of the energy crisis, it is crucial to design a sustainable Air Transportation system. Current approaches focus on Air traffic management. Nevertheless, also the historically evolved network offers great potential for an optimized redesign. But the understanding of its complex structure and development is limited, although modern network science supplies a great set of new methods and tools. So far studies analyzing Air Transportation as a complex network are based on divers and poor data, which are either merely regional or strongly bounded time-wise. As a result, the current state of research is rather inconsistent regarding topological coefficients and incomplete regarding network evolution. Therefore, we use the historical, worldwide OAG flight schedules data between 1979 and 2007 for our study. Through analyzing by far the most comprehensive data base so far, a better understanding of the network, its evolution and further implications is being provided. To our knowledge we present the first study to determine that the degree distribution of the worldwide Air Transportation network is non-stationary and is subject to densification and accelerated growth, respectively.
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Investigation of the Fuel Efficiency of the U.S. Air Transportation Network Structure
10th AIAA Aviation Technology Integration and Operations (ATIO) Conference, 2010Co-Authors: Mark Azzam, Philippe Bonnefoy, John R. HansmanAbstract:The combination of increasing demand for Air Transportation, high fuel prices and the growing environmental awareness motivates the need for fuel efficiency improvements and emissions reductions of the aviation sector. One potential approach to improve aviation’s fuel and CO2 emissions efficiency is to improve the structure of the Air Transportation network. This research focuses on alternative topologies for the US Air Transportation network, passenger routing and fleet composition. In order to identify and evaluate these alternatives, an optimization model was developed were the network topology, routing strategies and Aircraft assignment are jointly optimized. It was found that the 2007 US Air Transportation network exhibits a topology that is close to its optimum and that further topological improvements may only yield a reduction in fuel burn of approximately 1%. Changes in Aircraft assignment and alternative Airline routing strategies between origin and destination markets appear to provide greater potential for efficiency improvements. It was found that improved passenger routing could decrease fuel burn by over 8% while the utilization of larger Aircraft yields a reduction of 10%. These findings suggest that there is limited potential from structural network topological improvements for the US Air Transportation network. However, strategies and policies that would incentivize the use of larger Aircraft and alternative Aircraft and passenger routings would provide greater potential for fuel efficiency and climate change emission reductions.