DEVELOPING GRAVITY MODEL FOR AIRLINE REGIONAL ROUTE MODELLING

The gravity model is a method that is used by transportation researchers, airline network planners and analysts to explain how traffic is distributed between city pairs in correlation to the distance or travelling time between them, which as a result indicates the behaviour of travellers or the performance of the transport connection. How ever, the applicability of the model depends on the reliability of the results, which poses a major issue for researches. The major difficulty is to obtain comparable qualitative insights into the key parameters that are selected. This paper presents a possibility study for the use of the gravity model for regional route planning from the scientific point of view and suggests possibilities of gravity model calibration for airline network analysis including alternative methods for estimating the gravity potential of destinations and measurement of the influence of distance on the potential. The focus of the research is the ability to explain and forecast the development of regional air transportation routes in the commercial aviation network when there is a lack of recorded booking demand data.

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Orędzie biskupów polskich w ocenie niemieckiego MSZ

Rocznik Polsko-Niemiecki ◽

10.35757/rpn.2011.19.03 ◽

2011 ◽

pp. 73-91

Author(s):

Piotr Madajczyk

Keyword(s):

Domestic Politics ◽

Point Of View ◽

West Germany ◽

Alternative Methods ◽

Political Climate ◽

History Of

The history of the Polish Bishops’ Letter of Reconciliation to the German bishops, sent in the autumn of 1965, that is, in a very inopportune political climate, is now relatively well known and researched. What contributed to its being widespread, was the perception of it as a pre-cursor of the Polish-German reconciliation, an initiative which, while not capable of having a real impact on Poland and West Germany in the 60s, pointed to alternative methods by which it could be carried out and distanced itself from retaining hostility as a basis for Polish-German relations and using the stereotype of a threat on the part of Germany in Polish domestic politics. The circumstances in which the Letter had been brought into being could be studied thanks to the opening of Polish archives after the fall of Communism. The article shows how the Letter was received by West German diplomacy, in terms, most of all, of an appraisal of the chances and opportunities in the international arena which could follow from such a reception. What was important from Bonn’s point of view was the setting of the controversies around the Letter in Poland in a wider context, namely, one of balancing the relationships between determinants rooted in domestic politics, the policy of Moscow and the East Block and that of the Vatican.

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Gaseous Solutions

Thermodynamics in Geochemistry ◽

10.1093/oso/9780195064643.003.0020 ◽

1993 ◽

Author(s):

Greg M. Anderson ◽

David A. Crerar

Keyword(s):

Equations Of State ◽

Intermolecular Forces ◽

Point Of View ◽

Alternative Methods ◽

Gaseous Species ◽

Fugacity Coefficient ◽

Ideal Gases ◽

Component Systems ◽

Liquid Solutions ◽

History Of

The procedures described in Chapter 15 are well suited to solid and liquid solutions and could also be applied to gases, but in fact, other approaches are generally used. The main reason for this is partly historical; much work was done early in the history of physical chemistry on the behavior of gases, and these methods have continued to evolve to the present day. We have also just seen that the Margules equations become very unwieldy with multi-component systems. Because true gases are completely miscible, natural gases often contain many different components, so the Margules approach is not very suitable. Unfortunately, the most successful alternative methods described in this section are also quite unwieldy; however, they do not become much more complicated for multi-component gases than they are for the pure gases themselves, and this is a definite advantage. We have seen that with real, non-ideal gases, all the thermodynamic properties are described if we know the T, P, and the fugacity coefficient. For gaseous solutions, the fugacity coefficient for each component generally depends on the concentrations and types of other gaseous species in the same mixture. All gases, whether pure or multi-component, should approach ideality at higher T and lower P; conversely, non-ideality is most pronounced in dense, low-temperature gases where intermolecular forces are strongest. The challenge here is to find an equation of state that can adequately cover this range of conditions for gases of many different constituents. In the following discussion we first briefly outline some of the equations of state used to describe pure gases. We will introduce these from the molecular point of view since this helps understand the physical basis (and limitations) of each model. Each of these equations of state can then be applied to mixtures of gases using a set of rules which we describe at the end of this section.

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The Most Preferred Route of the Car Navigation System: A Systems Engineering Approach

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.712-715.2680 ◽

2013 ◽

Vol 712-715 ◽

pp. 2680-2685

Author(s):

Kyung Il Choe

Keyword(s):

Systems Engineering ◽

Route Planning ◽

Point Of View ◽

Navigation Systems ◽

Engineering Approach ◽

System A ◽

Shortest Route ◽

Baseline System ◽

Baseline Component ◽

Car Navigation

The typical route planning of on-board car navigation systems (CNS) attempts to find the shortest route without considering users preferences and driving contexts. However it is more effective for a user to find the most preferred route rather than the shortest one. We propose a systems engineering approach for finding the most preferred route by considering and tracking the requirements of CNS route planning from the business point of view. Our approach consists of 4 baselines: customer baseline, system baseline component baseline, and design baseline. The architecture of a route planning engine is suggested according to the baselines.

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The miracle (and mirage) of Mexican flight: Aviation development in Mexico, during and after the Second World War

The Journal of Transport History ◽

10.1177/0022526618823931 ◽

2019 ◽

Vol 40 (1) ◽

pp. 25-43

Author(s):

Peter Soland

Keyword(s):

Second World War ◽

World War ◽

Crucial Point ◽

Cultural Stereotypes ◽

Commercial Aviation ◽

Financial Decisions ◽

The Usa ◽

Post War ◽

Aviation Network ◽

Second World

This paper explores the development of Mexican commercial aviation (and more specifically the trajectory of Compañía Mexicana de Aviación) against the background of Mexico’s Second World War alliance with the USA and its post-war economic expansion. USA foreign aid allowed Mexican president Manuel Ávila Camacho (1940–46) to further develop the country’s aviation network and personnel. The Second World War’s disruption of tourism allowed Mexico to reap the benefits of a rapidly growing vacation industry. The election of Miguel Aléman in 1946 reinforced commercial aviation and tourism as crucial, co-dependent elements in modernising the country and making Compañía Mexicana de Aviación a symbol of national progress. Although the Second World War emerges as a crucial point in the development of Mexican aviation, the same processes that buoyed commercial airlines also reinforced cultural stereotypes that were exploited for USA tourists and masked reckless financial decisions that nearly bankrupted Compañía Mexicana de Aviación’s in late 1950s.

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The Adoption of Network-Centric Data Sharing in Air Traffic Management

Research Anthology on Reliability and Safety in Aviation Systems, Spacecraft, and Air Transport ◽

10.4018/978-1-7998-5357-2.ch006 ◽

2021 ◽

pp. 127-151

Author(s):

Karel Joris Bert Lootens ◽

Marina Efthymiou

Keyword(s):

Traffic Management ◽

Air Traffic Management ◽

Air Traffic ◽

Point Of View ◽

Structured Interviews ◽

Air Navigation Services ◽

Aviation Network ◽

Collaborative Decision ◽

Insight Into

Network-centric sharing of data between all Air Traffic Management (ATM) stakeholders can improve the aviation network substantially. The System Wide Information Management (SWIM) platform is a platform for the open sharing of all information between aircraft operators, airports, air navigation services providers (ANSPs), and meteorology services, but has struggled to find a following. This article aims to identify the potential reasons for the slow adoption of the SWIM platform, and to investigate how to better communicate its potential. To gain insight into the drivers for each of the stakeholders, a series of semi-structured interviews was conducted with airlines, airports and ANSPs. Moreover, an Airport Collaborative Decision Making (A-CDM) initiative at the airport in Dublin was included as a case study. Recommendations are provided on how to address the results from a governance point of view.

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An Early Assessment of Relationship between Spatial Diffusion of Covid-19 and Evolving Worldwide Commercial Aviation Network: Exploring Global and Local Changes in Aviation Networks Using Node Degree Centrality

The Korean Association of Space and Environment Research ◽

10.19097/kaser.2020.30.3.138 ◽

2020 ◽

pp. 138-166

Author(s):

Yongha Park ◽

Jeongwoong Sohn

Keyword(s):

Node Degree ◽

Spatial Diffusion ◽

Degree Centrality ◽

Early Assessment ◽

Commercial Aviation ◽

Aviation Network ◽

Global And Local

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The Refuelling of Aircraft in Fligh

Journal of the Royal Aeronautical Society ◽

10.1017/s0368393100111393 ◽

1931 ◽

Vol 35 (252) ◽

pp. 1137-1145

Author(s):

J. H. B. Larrard

Keyword(s):

Point Of View ◽

Long Distance ◽

Commercial Aviation ◽

Hazardous Procedure

The establishment of contact between aircraft in flight for the purpose of refuelling, has until recently been regarded as a somewhat hazardous procedure employed mainly during attempts to create endurance records.It would appear, however, that if such contact between aircraft could be established safely and as a routine operation, considerable advantages could be obtained by the employment of such a scheme.From the point of view of commercial aviation, not only would it make possible long distance non-stop flights over regular air routes, but it would enable a large increase in pay load to be carried, since the bulk of the aircraft's consumable load, i.e., fuel, would not be taken on board until the aircraft had left the ground and climbed to a reasonable height.

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The Analysis of Spatial Pattern and Hotspots of Aviation Accident and Ranking the Potential Risk Airports Based on GIS Platform

Journal of Advanced Transportation ◽

10.1155/2018/4027498 ◽

2018 ◽

Vol 2018 ◽

pp. 1-12 ◽

Cited By ~ 2

Author(s):

Yafei Li ◽

Chen Liang

Keyword(s):

Spatial Distribution ◽

Hot Spots ◽

Route Planning ◽

Severity Index ◽

Point Of View ◽

General Aviation ◽

Spatial Characteristics ◽

Aviation Accidents ◽

The North ◽

Accident Severity

Aviation accident analysis is an important task to ensure aviation safety. The existing researches mainly focus on the analysis of aviation accident time characteristics and accident causes and less analysis of the spatial characteristics of aviation accidents. The spatial characteristics analysis of aviation accidents can identify hot spots of aviation accidents, improve the accuracy of aviation accident emergency management, and provide decision support for airport route planning. This study established the severity index of aviation accident based on aviation accident data, using GIS spatial analysis methods to study the spatial distribution characteristics of aviation accidents. The hot spots were identified in the aviation accidents. Finally, airports around the accident hot spots were ranked to obtain the airports with high potential aviation risks based on RI, taking Florida as an example. It was found that in the Florida aviation accident, general aviation accidents accounted for the majority, but the aviation accident severity index for air route flight was far greater than general aviation accidents. From the spatial distribution point of view, accidents with high severity index were distributed around large international airports. The Density Center for Aviation Accidents was located in Tampa, Miami, and some airports link areas in Florida. In terms of the Moran’s I index, the distribution of aviation accidents tended to aggregate in the region as a whole. However, aviation accident severity index was randomly distributed for each year separately. At the level of significance of 0.01, there were a total of 75 accident hotspots in the Florida region, mainly in the north and southwest. Airports with high RI in the Florida area were mainly concentrated in the Miami area and the Tampa Bay area, and Orlando Airport was ranked outside the top 10.

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