المؤلفون: Bramblett, Lauren, Miloradovic, Branko, Sherman, Patrick, Papadopoulos, Alessandro V., Bezzo, Nicola

مصطلحات موضوعية: Computer Science - Robotics

الوصف: As Multi-Robot Systems (MRS) become more affordable and computing capabilities grow, they provide significant advantages for complex applications such as environmental monitoring, underwater inspections, or space exploration. However, accounting for potential communication loss or the unavailability of communication infrastructures in these application domains remains an open problem. Much of the applicable MRS research assumes that the system can sustain communication through proximity regulations and formation control or by devising a framework for separating and adhering to a predetermined plan for extended periods of disconnection. The latter technique enables an MRS to be more efficient, but breakdowns and environmental uncertainties can have a domino effect throughout the system, particularly when the mission goal is intricate or time-sensitive. To deal with this problem, our proposed framework has two main phases: i) a centralized planner to allocate mission tasks by rewarding intermittent rendezvous between robots to mitigate the effects of the unforeseen events during mission execution, and ii) a decentralized replanning scheme leveraging epistemic planning to formalize belief propagation and a Monte Carlo tree search for policy optimization given distributed rational belief updates. The proposed framework outperforms a baseline heuristic and is validated using simulations and experiments with aerial vehicles.

الوصول الحر: http://arxiv.org/abs/2403.00641Test

المؤلفون: Oliveira, Alessandro V. M.

المصدر: Communications in Airline Economics Research, 1, 10659441, 2024

مصطلحات موضوعية: Economics - General Economics

الوصف: This study investigates price seasonality in the Brazilian air transport industry, emphasizing the impact of the COVID-19 pandemic on domestic airline pricing strategies. Given potential shifts in demand patterns following the global health crisis, this study explores possible long-term structural changes in the seasonality of Brazilian airfare. We analyze an open dataset of domestic city pairs from 2013 to 2023, employing an econometric model developed using Stata software. Our findings indicate alterations in seasonal patterns and long-term trends in the post-pandemic era. These changes underscore potential shifts in the composition of leisure and business travelers, along with the cost pressures faced by airlines.

الوصول الحر: http://arxiv.org/abs/2402.13789Test

المؤلفون: Brito, Igor R. S., Oliveira, Alessandro V. M.

المصدر: Communications in Airline Economics Research, 1, 10671670, 2024

مصطلحات موضوعية: Economics - General Economics

الوصف: In this study, we will address some topics related to the privatization of airports in the scientific literature, in an attempt to provide an answer to the following question: does the privatization of airports bring positive results? Firstly, we turn our attention to the motivations leading to privatization, considering the two main parties involved, the government and the private sector. After all, the success of such a decision will be relative to the reasons that justify it. In a second moment, we will consider the regulatory issue, whose influence on the airport's financial performance is consolidated in the literature. In the third part, we address the main documented results of privatization, with special attention to productive efficiency, whose improvement is the most popular motivation for privatization.
Comment: This article is written in Portuguese

الوصول الحر: http://arxiv.org/abs/2402.13279Test

المؤلفون: Oliveira, Bruno F., Oliveira, Alessandro V. M.

المصدر: Communications in Airline Economics Research, 1, 10671668, 2024

مصطلحات موضوعية: Economics - General Economics

الوصف: This work focuses on trying to understand how the construction of an airline's network is made. For this purpose, the case of Azul was studied, investigating which and how factors affect the decision of this airline to enter domestic routes, in addition to analyzing how the merger of Azul with the regional airline Trip affected the company's network planning. For this, an academic study was conducted using an econometric model to understand the airline's entry model. The results show that Azul's business model is based on connecting new destinations, not yet served by its competitors, to one of its hubs, and consistently avoiding routes or airports dominated by other airlines. Regarding the effects of the merger, the results suggest that Azul moved away from its original entry model, based on JetBlue, to a model more oriented towards regional aviation, entering shorter routes and regional airports.
Comment: This article is written in Portuguese

الوصول الحر: http://arxiv.org/abs/2402.13278Test

المؤلفون: Resende, Carolina B., Oliveira, Alessandro V. M.

المصدر: Communications in Airline Economics Research, 1, 10671664, 2024

مصطلحات موضوعية: Economics - General Economics

الوصف: In recent years, the topic of global warming and greenhouse gas emissions has been increasingly in the media. This theme has raised various flags, showing concern for the future and seeking alternatives for a more sustainable life over the years. When studying greenhouse gas emissions, one of the main emitters of such gases is the burning of fuels, in which transport vehicles that depend on gas and oil are included. In this respect, air transport through aircraft is one of the sources emitting such gases. Aiming to reduce gas emissions, one of the ways to do this is by reducing fuel consumption; for this, aircraft would have to be more efficient, or the offer and demand for flights would be reduced. However, what if aircraft fuel consumption were taxed? What would be the effects of this on air transport? Could this be one of the alternatives to reduce emissions? To understand this relationship between taxation and a possible reduction in fuel consumption, a study was developed by the Aeronautics Institute of Technology (ITA), using an econometric model to understand how demand would be affected by changes in airfares. In addition, a simulation of possible environmental taxes on the values of air tickets was carried out to analyze the demand response and to get an idea if this taxation would really solve the emission problems.
Comment: This article is written in Portuguese

الوصول الحر: http://arxiv.org/abs/2402.12404Test

المؤلفون: Massaretto, Murillo, Oliveira, Alessandro V. M.

المصدر: Communications in Airline Economics Research, 1, 10671662, 2024

مصطلحات موضوعية: Economics - General Economics

الوصف: The exploration of existing commercial opportunities has been increasing the share of commercial (non-aeronautical) revenues in the total revenues of airports worldwide. These revenues, also called commercial, non-aeronautical, or non-tariff revenues, come from rentals, duty-free shops, food and beverage sales, parking, advertising, etc. In other words, everything that is not the main business of the airport. Consequently, the dependence on commercial revenues has also become increasingly important, and airport managers are interested in understanding how to improve their financial results with this new revenue source, as it not only improves financial outcomes but also optimizes passengers' time and money consumption options at airports. Therefore, this chapter seeks to discuss the main determinants of commercial revenues at national airports, analyzing the possible impacts of the behavior of passengers from low-cost carriers (LCC) on these revenues, combined with other determining factors.
Comment: This article is written in Portuguese

الوصول الحر: http://arxiv.org/abs/2402.12403Test

المؤلفون: Narcizo, Rodolfo R., Oliveira, Alessandro V. M.

المصدر: Communications in Airline Economics Research, 1, 10671660, 2024

مصطلحات موضوعية: Economics - General Economics

الوصف: This study addresses the growing standardization of airline fleets, highlighting that frequent passengers are more likely to fly on the same aircraft model more often. The objective is to analyze the fleet management of airlines and the impact of a reduced variety of models on company operations. The benefits of standardization, such as operational efficiency, and the risks, such as vulnerability to specific model failures, are discussed. The work reviews international scientific literature on the subject, identifying consensus and disagreements that suggest areas for future research. It also includes a study on the Brazilian market, examining how standardization affects operational costs and profitability in terms of model, family, and aircraft manufacturer. Furthermore, the relationship between fleet standardization and the business model of the companies is investigated, concluding that the advantages of standardization are not exclusive to low-cost companies but can also be leveraged by other airlines.
Comment: This article is written in Portuguese

الوصول الحر: http://arxiv.org/abs/2402.12402Test

المؤلفون: Eufrásio, Ana B. R., Oliveira, Alessandro V. M.

المصدر: Communications in Airline Economics Research, 1, 10671658, 2024

مصطلحات موضوعية: Economics - General Economics

الوصف: This study explores the approaches used by airlines in setting flight times. It highlights the need to balance operational and strategic factors, such as optimizing the use of resources - including aircraft, crew, and fuel - and managing the risks related to delays and congestion. The work details a national analysis focused on domestic flights, investigating the factors that influence companies to adjust scheduled flight times and the impact of this practice on punctuality. The results indicate that decisions about flight time are influenced by both operational and strategic aspects, being affected by competition and the sector's policies on punctuality and slot allocation. Furthermore, it was found that adding extra time is an effective strategy for reducing delays, although it may conceal system deficiencies.
Comment: This article is written in Portuguese

الوصول الحر: http://arxiv.org/abs/2402.12401Test

المؤلفون: Szenczuk, João B. T., Oliveira, Alessandro V. M.

المصدر: Communications in Airline Economics Research, 1, 10671656, 2024

مصطلحات موضوعية: Economics - General Economics

الوصف: This work presents an analysis of recent literature examining factors that influence flight times in Brazil, with special attention to the impact of new technology implementations, specifically Performance-Based Navigation (PBN). PBN procedures began to be implemented in Brazilian airspace in 2009 and represent a new concept of air navigation, using satellites to create 3D flight routes that are shorter and more precise, potentially reducing the distances flown and consequently flight times and delays. Flight times depend on various factors, such as the size and complexity of the origin and destination airports, weather conditions, aircraft models, and how full the flights are. Therefore, to assess the impact of the new procedures, the variation in this set of factors must be taken into account. The results found in the literature suggest that Performance-Based Navigation had a positive impact, reducing flight times by about 1-2%, representing a saving of tens of thousands of flight hours from the beginning of implementations in 2009 until the end of 2018.
Comment: This article is written in Portuguese

الوصول الحر: http://arxiv.org/abs/2402.11374Test

المؤلفون: Oliveira, Bruno F., Oliveira, Alessandro V. M.

المصدر: Communications in Airline Economics Research, 1, 10671650, 2024, 2024

مصطلحات موضوعية: Economics - General Economics

الوصف: This study aims to discuss the impacts of a low-cost airline on the air transport market and, especially, to present the most recent findings from specialized literature in the field. To this end, various works on this topic, published since 2015, were selected and analyzed. From this analysis, it was possible to categorize the main topics discussed in the papers into five groups: (i) the impacts of a low-cost airline on competing airlines; (ii) impacts on airports; (iii) general impacts on the demand for air transport; (iv) effects on passengers' choice process; and (v) general effects on a geographical region.
Comment: This article is written in Portuguese

الوصول الحر: http://arxiv.org/abs/2402.11372Test