VIII SITRAER

Volume IV
2008

Abstract
VARIGLOG domestic freight route structure is heavily dependent on VARIG domestic passenger route structure. Commercial and operational agreements allow the sharing of the large cargo compartments of VARIG wide-bodies passenger planes, therefore freight VARIGLOG routes were structured accordingly. This reality changed dramatically in 2005 and 2006 with VARIG bankruptcy process and selling hustle and its immediate resizing and restructuring. The paper analyzes the impacts of VARIG resizing and restructuring over VARIGLOG aiming to identify the more promising all cargo routes VARIGLOG should seek presence. VARIGLOG presence was modeled with a Binomial LOGIT model calibrated using 2001 to 2004 available data. The model uses explanatory variables that represent: (1) domestic routes cargo demand, (2) regional economic activity, (3) routes length, (4) rivals supply, (5) passenger flights cargo supply and (6) a dummy of airline hub airport. Application of the model showed improved fitting compared to an early model developed by Silveira et al (2006). Finally, the model was used to evaluate VARIGLOG all cargo route structure policy in a changing market where VARIG has reduced its passenger domestic flights in the second period of 2006. Results showed about 30 routes with increased indication of good opportunities for VARIGLOG presence in this new scenario.

[Full-Text PDF 402.74 KB]

Analysis of the Degree of Importance of the Airport Passenger Terminal Components in São Paulo/Guarulhos International Airport
Michelle Carvalho Galvão da S. P. Bandeira
Anderson Ribeiro Correia

Abstract
This paper applies the Analytical Hierarchy Process (AHP) to determine the importance that users assign to the various components of an airport passenger terminal (APT) and their attributes. A survey was employed to obtain the user perceptions at São Paulo/Guarulhos International Airport, the largest airport in South America. The results indicate that the most important components of an APT for departing passengers are the check-in counter and the departure lounge. The results are useful for airport planners and managers in order to assist them during the resource allocation planning, since they could provide more resources (funds, employees, etc) to components that are more important for passengers.

[Full-Text PDF 172.61 KB ]

Air Traffic Control and the Challenges Generated for the Future Computational Systems
João Batista Camargo Jr.
Paulo Sérgio Cugnasca
Jorge Rady de Almeida Jr.

Abstract
This paper presents some research works on air traffic control conducted by the Safety Analysis Group (GAS) of the Polytechnic School of the University of São Paulo (USP), Brazil, related to the CNS/ATM (Communication, Navigation, Surveillance/Air Traffic Management) context. These research works aim to highlight the new challenges that will be adopted by computational systems that will automate the air traffic control process, or support collaborative decisions. These new challenges make sense due to the growing demand on air traffic and aim to maintain the safety levels compatible to those used nowadays, or even to increase them. The new air traffic control systems will depend more and more on computational systems, for control, decision support and risk assessment. These researches have as new focus to certify that the risk levels are equal to or even smaller than the current ones, in an environment of increasing demand. Interdisciplinary concerns will have a very important role in this context, because computer and aeronautic engineering must work together, seeking to attain this new automation paradigms and a harmonious control of future needs, having in mind the human agents involved in this process: pilot and air traffic controller.

[Full-Text PDF 136.78 KB ]

Distributed Decision Support System Applied to Tactical Air Traffic Flow Management in the Case of Cindacta I
Antonio Marcio Ferreira Crespo
Carlos Vuyk de Aquino
Bueno Borges de Souza
Li Weigang
Alba Cristina Magalhaes Alves de Melo
Victor Rafael R. Celestino

Abstract
This paper describes a research proposal to develop a Distributed Decision Support System for Air Traffic Flow Management (SISCONFLUX ) targeted at the First Integrated Center of Air Defense and Air Traffic Control (CINDACTA I) in Brasília. The decision making process in a distributed system such as ATFM is very complex since there is a considerable number of techniques and operation procedures that must work together. The use of a distributed approach is strongly suited for this kind of problem since the entities of the system (pilots, air traffic managers and controllers) are geographically distributed and communicate with each other by message exchange. This paper specifies the role of CINDACTA I, presents the problem diagnosis and the proposed solution including the system architecture, implementation procedures, methodology and a brief theoretical discussion about the Ground Holding Problem – GHP.

[Full-Text PDF 198.25 KB ]