scholarly journals Analysing and modeling performances of a long-haul air route network

2021 ◽  
Vol 7 (1) ◽  
pp. 5-36
Author(s):  
Milan Janić
Keyword(s):  
Traffic Control ◽  
Network Capacity ◽  
Analytical Models ◽  
Ultimate Capacity ◽  
Policy Makers ◽  
Aircraft Flight ◽  
The North ◽  
Route Network ◽  
Practical Capacity ◽  
Service Channels

This paper deals with analyzing and modelling performances of a long-haul air route network operating as the queuing network. The network consists of the routes/tracks with flight levels serving aircraft/flights as the service channels. The main network performances are the ultimate and practical capacity of service channels, the aircraft/flight demand, delays before entering and total time of aircraft/flights spending in the network, and the related generalized costs including those of airlines, air passengers, policy makers and society. The analytical models of the particular network performances and three routing or assignment models/procedures for matching the aircraft/flight demand to capacity are developed and applied to the long-haul air route network in the North Atlantic airspace between Europe and North America. The results have indicated that. the network capacity has been strongly dependent on the number of routes/tracks and flight levels, i.e., service channels and their ultimate and/or practical capacity. The ultimate capacity has been mainly influenced by the ATC (Air Traffic Control) separation rules applied between aircraft/flights operating in the same directions. The practical capacity has been strongly influenced by the ultimate capacity and the average delays imposed on aircraft/flights before entering the network. The rather superior and close to optimal model/procedure for matching demand to capacity has been routing or assignment of the aircraft/flights demand in proportion to the ultimate or practical capacity of particular service channels minimizing the total generalized costs of the actors/stakeholders involved.

Multi-Objective Fleet Assignment Problem Based on Self-Adaptive Genetic Algorithm

2013 ◽  
Vol 694-697 ◽  
pp. 2895-2900 ◽  
Author(s):  
Xiao Yang ◽  
Bo Jiang
Keyword(s):  
Genetic Algorithm ◽  
Carbon Emissions ◽  
Assignment Problem ◽  
Network Capacity ◽  
Total Carbon ◽  
Adaptive Genetic Algorithm ◽  
Multi Objective ◽  
Route Network ◽  
Assignment Model ◽  
Key Factor

Since the beginning of the twenty-first century, energy conservation has become the theme of the development of the world. China government set the emissions-reduction targets in various industries on the 12th Five-Year Plan. And the airlines were committed to reduce their carbon emissions. From an operational perspective, the airline model assignment problem is a key factor of the total carbon emissions on the entire route network. But the traditional aircraft assignment models approach did not account for this purpose to reduce carbon emissions. By constructing the multi-objective optimization models consider carbon emissions assignment model using a genetic algorithm, numerical example shows that the model is able to meet all aspects demand which include meeting route network capacity demand, minimizing operating costs and reducing total aircraft fleet carbon emissions.

scholarly journals Interdependance, linkage et système international : de l'analyse conceptuelle aux problèmes de politique étrangère

2005 ◽  
Vol 18 (2) ◽  
pp. 329-352
Author(s):  
Irnerio Seminatore
Keyword(s):  
Foreign Policy ◽  
International Relations ◽  
International System ◽  
Political Context ◽  
International Policy ◽  
Policy Makers ◽  
The North ◽  
Interdependence Theory ◽  
The Face ◽  
The Impact

The emergence and evolution of the literature dealing with interdependence in the international System is looked into. An attempt is made to show its significance and main points as well as its implications. The debates on interdependence within the North-American political context are regarded as solutions to the preceding issues on dependence. Interesting passages are dedicated to the impact of the interdependence theory on the interpretation of the international system, as illustrated by two schools of thought in foreign policy (Kissinger-Brzezinski). Linkage of the tactical and strategic aspects to the economic and political interrelation of international relations, as put forward by policy makers, has brought to the fore the difficulties and limits of negotiation in the face of competition and in the aftermath of confrontation. This paper offers subtle, yet positive, conclusions on the use of the interdependance theory in international policy.

scholarly journals Smoking behaviour among schoolteachers in the north of the Syrian Arab Republic

2000 ◽  
Vol 6 (2-3) ◽  
pp. 352-358 ◽  
Author(s):  
W. Maziak ◽  
F. Mzayek ◽  
M. Al Moushareff
Keyword(s):  
Young People ◽  
Smoking Habit ◽  
Smoking Behaviour ◽  
Monthly Income ◽  
Policy Makers ◽  
Attitudes And Practices ◽  
The North ◽  
Syrian Arab Republic ◽  
Smoking Patterns ◽  
Foreign Brands

Characterizing the smoking habit in specific populations is important for health planners and policy-makers. We studied the smoking patterns of schoolteachers in Saraqeb, Syrian Arab Republic and found that 52.1% of males and 12.3% of females were current smokers. Male daily smokers smoked 20 +/- 1 cigarettes per day, females 10 +/- 4. Males had smoked for, on average, 16 +/- 1 years, females for 9 +/- 4 years. Daily smokers buying foreign brands spent 22.0% of their monthly income on cigarettes, while those smoking local brands spent 12.2%. Most teachers who smoked did so openly at school. Smoking among teachers should receive attention because it is closely related to the attitudes and practices of young people towards smoking

scholarly journals Regional quality of living in Europe

REGION ◽  
2015 ◽  
Vol 2 (2) ◽  
pp. 1 ◽  
Author(s):  
Piet Lagas ◽  
Frank Van Dongen ◽  
Frank Van Rijn ◽  
Hans Visser
Keyword(s):  
Population Density ◽  
Capital City ◽  
Gdp Per Capita ◽  
European Regions ◽  
Policy Makers ◽  
The North ◽  
City Regions ◽  
Quality Of Living ◽  
Per Capita

This article sets out the conceptual framework and results of Regional Quality of Living indicators that were developed in order to benchmark European NUTS2 regions. Nine non-business-related indicators are constructed to support the goal of policy makers to improve the attractiveness of regions and cities for people or companies to settle in, and by doing so create economic growth. Each of the constructed indicators represents a pillar of the Quality of Living. The highest indicator scores are found for regions within Switzerland, Sweden, Norway and the Netherlands. Some countries show a wide divergence between regional scores. The southern regions of Italy and Spain, for example, have significantly lower scores than those in the north. In addition, capital city regions have better RQI scores. A positive correlation was found between the average RQI scores and both GDP per capita and weighted population density. Compared to GDP per capita, weighted population density has a modest influence on the RQI score. The European regions are divided into 11 clusters, based upon GDP per capita and weighted population density in order to benchmark a region with its peers.

American Policy-making and the North Korean Aggression

1955 ◽  
Vol 7 (2) ◽  
pp. 209-232 ◽  
Author(s):  
Alexander L. George
Keyword(s):  
Policy Making ◽  
Korean War ◽  
Policy Makers ◽  
American Experience ◽  
The Past ◽  
The North ◽  
The Korean War ◽  
American Policy ◽  
Peripheral Areas ◽  
And Behavior

The Korean War represented the first American experience with the problem of meeting local Communist aggression by means of limited, if costly, warfare. But despite the revulsion with that experience, and the “new look” at military strategy and foreign policy, it may not be the last. The character of recent weapons developments and the passing of our thermonuclear monopoly make it probable that in the future, as in the past, American policy-makers will be forced to consider the alternative of local conflict, with all its problems and risks, in determining how to respond to the threat or actuality of Communist moves in the peripheral areas.In these circumstances, analyses of American policy-making immediately before and during the Korean War may well illuminate the perspectives and considerations relevant to this difficult and dangerous type of operation. Here, no more can be done than toexamine the effect of strategic planning and estimates of Communist intentions and behavior on the decision to commit American forces to the defense of South Korea. This decision, and even the crucial decision to commit ground forces to eventual offensive operations against the aggressor, was made within afew days of the North Korean attack. Attention, accordingly, is focused on American policy reactions to the war in the first week or ten days following June 25, 1950.

scholarly journals Application of Classical Coastal Trapped Wave Theory to High-Scattering Regions

2019 ◽  
Vol 49 (9) ◽  
pp. 2201-2216 ◽  
Author(s):  
Kelsey Brunner ◽  
David Rivas ◽  
Kamazima M. M. Lwiza
Keyword(s):  
Wave Theory ◽  
The United States ◽  
Analytical Models ◽  
Theoretical Formulation ◽  
Study Region ◽  
Outer Banks ◽  
The North ◽  
Coastal Trapped Wave ◽  
Seasonal Wind ◽  
Wave Limit

AbstractSince the 1970s, analytical models of coastal trapped waves (CTWs) have been developed using a first-order wave equation in the long-wave limit. Formulations of this kind require assumptions of a straight coastline with similar shelf bathymetry. These assumptions prevent the models from capturing the scattering and backscattering behavior of propagating CTWs that encounter changing coastlines, bathymetry, or shelf width. CTW modes from two different analytical models, one of which includes friction and stratification, are compared with CTW observations of velocity and pressure from a study region near the Outer Banks off the North Carolina coast in the United States. The coastline in the study region is relatively straight locally but is bounded by an estuary to the north and shelf narrowing to the south, both of which induce scattering. The models suggest that the CTWs in this region are insensitive to changes in stratification, implying that observed seasonal differences in wave magnitude are due to seasonal wind forcing. Furthermore, friction is found to be important, particularly for mode-1 propagation, but higher-order modes are prevalent despite the importance of friction. There is very poor agreement between the observed and modeled free and forced CTWs because of scattering. This lack of agreement indicates that this is not a globally applicable theoretical formulation because many global coastlines violate the basic assumptions.

Fan Lift in VTOL Design

1969 ◽  
Vol 73 (704) ◽  
pp. 657-664 ◽  
Author(s):  
R. G. West
Keyword(s):  
Traffic Control ◽  
Air Traffic Control ◽  
Air Traffic ◽  
Eastern Area ◽  
The Past ◽  
The North ◽  
Safe Level ◽  
Commercial Airline ◽  
Time Period ◽  
North Eastern

During the past two years the commercial airline operators and the travelling public alike have been forced to acknowledge the rapid increase in airport congestion. This problem is most marked in the North Eastern area of America at the present time but a similar situation will develop fairly soon at major airports in Europe. Even with the introduction of the airbus to scheduled services, the number of aircraft movements at conventional airports, within a given time period, will reach a maximum safe level. The restrictions are imposed partly by the large number of aircraft operations on each runway, and partly by Air Traffic Control safety limits.

Aeronautical Satellite Systems for Air Traffic Control and Communications in the European Environment

1969 ◽  
Vol 73 (700) ◽  
pp. 283-288
Author(s):  
H. G. Leysieffer
Keyword(s):  
North Atlantic ◽  
Traffic Control ◽  
Air Traffic ◽  
Traffic Surveillance ◽  
Satellite Systems ◽  
The Past ◽  
The North ◽  
The North Atlantic ◽  
Trade Route ◽  
North Atlantic Area

The North Atlantic is increasingly developing into the main trade route of the age. Shipping, the pioneer along this highway of commerce, in the past decade has been joined by air traffic displaying a striking growth rate. Not only is the number of aircraft simultaneously plying the Atlantic routes constantly on the increase, but also the volume of passengers and freight transported on each flight. The question, whether such flow of traffic in the air and on water could be dealt with in future with the safety to which it is entitled, has led to world-wide discussions over the past few years concerning the necessity for an air traffic surveillance system for the North Atlantic area. A further question, whether one should not include also sea traffic in such a system suggested itself. The initiative for holding such discussions naturally proceeded less from air and shipping undertakings, but rather from those committees who are entrusted in supervising the safety in the conduct of man and merchandise.

Unconventional gas: local supply, global implications

2011 ◽  
Vol 51 (2) ◽  
pp. 679
Author(s):  
Craig McMahon
Keyword(s):  
North America ◽  
Gas Production ◽  
Coal Bed ◽  
Unconventional Gas ◽  
Policy Makers ◽  
The North ◽  
Local Supply ◽  
Sharp Growth ◽  
Gas Market ◽  
The Impact

The sharp growth in unconventional gas production in North America has turned the gas market on its head. Unconventional gas (coal bed methane, tight gas and shale gas) is present in large volumes throughout the world—it offers the potential to continue to reshape global gas dynamics. Many expect the North America experience of sharp unconventional gas growth to be repeated elsewhere and are forecasting the perpetuation of a global gas surplus. Is this likely? We consider the impact of its development, identify some of the issues that will constrain its growth and address some of the implications for upstream suppliers, resource holders, buyers and policy makers. No post-Conference paper or slides are available for this presentation.

Kai Tak Airport, Hong Kong

1985 ◽  
Vol 1 (2) ◽  
pp. 141-141
Author(s):  
T.M. Moles
Keyword(s):  
Hong Kong ◽  
Traffic Control ◽  
Fold Increase ◽  
Weather Conditions ◽  
Fire Service ◽  
Air Traffic ◽  
Service Planning ◽  
The North ◽  
Military Command ◽  
Aircraft Accident

Hong Kong is situated at the center of the air traffic axis for Asia, and has, at Kai Tak, one of the busiest airports in the world. The areahas experienced a ten-fold increase in population over 25 years and now has the highest urban density in Asia. Hong Kong is in the monsoon belt and is subjected to the very severe weather conditions of typhoons.Kai Tak airport is unique. The main 7,000 foot runway is substantially reclaimed from the harbor which in turn lies within a spectacular mountain bowl. The 310° flight path traverses the north end of the Kowloon peninsula with equally spectacular urban development.Overall disaster contingency planning within this broad spectrum is the responsibility of a joint Police/Military Command. An Aircraft Accident Committee coordinates joint emergency service planning, command and communications training and exercises.Response to an aircraft disaster is initated by Air Traffic Control through the joint Fire Service/Police/Military Command which sets up a discretionary response for intervention, search and rescue by land, sea and air.Although the problems are universal, the Maximum Credible Incident scale is extraordinary to Hong Kong. Unique means of dealing with this problem have been specially evolved here, particularly in the field of fire fighting and marine rescue which involve a Catamaran Rescue and Immediate Care Vessel.

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