Esta pesquisa trata o Problema de Programação de Tripulantes (PPT), presente no planejamento operacional das empresas aéreas. O principal objetivo do PPT é atribuir o conjunto de tripulantes requeridos para a operação dos voos de uma malha aérea de maneira a minimizar o custo total da tripulação, levando em conta a legislação pertinente e a satisfação dos tripulantes. O PPT é normalmente dividido na literatura em dois subproblemas independentes, modelados e resolvidos sequencialmente: Problema de Determinação de Viagens (PDV) e Problema de Atribuição de Escalas (PAE). Esta decomposição não incorpora os atributos (disponibilidade, qualificação, senioridade e preferências individuais) dos tripulantes de forma global, o que não permite uma estimativa real de custo e afeta a qualidade da solução final. O estado da arte envolve a solução integrada do PPT, eliminando a necessidade de se resolver inicialmente o PDV e permitindo a obtenção de uma solução mais realista. O PPT, no entanto, é de natureza combinatória. Assim sendo, esta pesquisa propõe e explora modelos baseados em programação linear inteira e em heurísticas para a solução integrada do PPT. Essas heurísticas incorporam fundamentos da meta-heurística GRASP, da heurística de economias de Clarke e Wright e da heurística day-by-day. Os modelos foram testados com sucesso para a solução de instâncias baseadas na malha real de três empresas aéreas brasileiras. / This doctoral research treats the Crew Scheduling Problem (CSP), as part of the airlines operational planning. The CSP consists of optimally assigning the required crew members to planned flights, in such a way that it minimizes the total cost of the aircrew, taking into consideration the proper legislation and the satisfaction of the crew members. The CSP is usually divided into two independent subproblems, modeled and solved sequentially: Crew Pairing Problem (CPP) and Crew Rostering Problem (CRP). This decomposition does not incorporate all the crew members attributes (availability, qualification, seniority and individual preferences), which does not lead to a real cost estimate and affects the quality of the final solution. The state of the art involves the integrated solution of CSP, without solving the CPP at first and providing a more realistic solution. The CSP, however, has a combinatorial nature. This research proposes and explores models based on integer linear programming and on heuristics to solve the CSP in an integrated way. These heuristics incorporate GRASP metaheuristic, Clarke and Wright savings heuristic and day-by-day heuristic. The models were successfully tested to solve instances related to the networks of three Brazilian airlines.

Route planning forms an important aspect of airline operations for them to sustain the effects of deregulation and fierce competition. The Indian economic liberalization in 1991 has seen diminishing monopoly of Air India and dynamic demand splits amongst the service providers. Our research focuses on developing an aggregate route traffic demand forecasting (RTDF) model specifically for international carriers operating from India. The model is an econometric model that combines concepts of the traditional Gravity model of Physics and the Micro-economic theoretic model that links demand to price. In other words, the RTDF model is a fusion of the behavioral and gravity models. While developing the model, Becker’s approach of utility maximization has been made use of, thereby combining time and other inputs required to produce travel. The model is developed for the existing international routes from India with 2005 aggregative data provided by International Civil Aviation Organization (ICAO), which spanned 15 countries in Europe, Asia, Canada, and North America. The model has been validated and tested for its predictive power on a few intentionally left out routes from the original sample. The model explains about 70% of the variance, which is well above the acceptable zone for cross-sectional data. The model is then estimated for 2007 data on a few randomly selected high demand routes; the prediction error ranging from a minimum of 3.5% to a maximum of 13%, a range well within the acceptable error limits. We derive a sector-cost-model (SCM) by applying the concept of break-even analysis on the RTDF model. The SCM provides cost estimates on a particular route at various levels of airfare. The SCM helps us gain further insights into the business nature prevailing in the airline sector. On the viability of operations, we propose the sector-operation-fare (SOF) to be charged on a respective route, given the load factor, if the airline wishes to continue operations. For arriving at the SOF, we follow a demand oriented framework that comprises of two demand curves: the airline curve and the traffic curve. The numerical analyses provide room for policy formulations that help airlines in refining, redefining, and revitalizing the decision-making process in their operations. Airlines can use this model to forecast demand for a newly contemplated route and obtain a fair idea of the price they can charge the customer. In other words, airlines can estimate the economic viability of operations on a respective route.

The thesis is focused on dynamically developing field of the air transportation. It is based on rights and duties of airlines and consumers. It is mapping the most important current law moves of Czech Republic which has been changed and agreed for a consumer protection. It describes consumer rights in the case of a flight delay and cancellation, refusal of entry on the plane and in the case of baggage problems. It also touches the issues of advertised price of plane tickets. It is followed by the analysis of current situation of the observance of consumer rights and their point of view on some controversial topics.

The objective of the thesis is to perform an analysis of low cost carrier market in the Europe, case studies of defunct and successful low cost carriers and to determine factors, which affect survival time of low cost carrier on the market. The thesis is focused on the European market in 2007-2017. It includes brief description of origin of low cost carriers and their spread to the European market. Next part is dedicated to general description of a low cost carrier and analysis of the European low cost market. Three defunct low cost carriers are described in the next chapter, which includes basic information and detailed description of their actions. It includes determination of cause of ceasing their operation. Three successful low cost carriers are described in the same manner. In the end, the factors affecting survival time of low cost carriers are determined with usage of an analysis of economic and operational parameters of low cost carriers.

BURP / Department of Urban and Regional Planning

L’objet de ce travail vise à déterminer si le transport aérien en Europe relève d’une compétence partagée entre l’Union européenne (UE) et les États membres, ou s’il s’agit plutôt d’une occupation du terrain par l’UE dans cette matière ? Ainsi, nous verrons en quoi consiste le cadre règlementaire communautaire portant sur le transport aérien en Europe. Dans un premier temps, nous porterons notre attention sur des aspects généraux entourant l’aviation en Europe, comme par exemple la mise en place d’un marché unique de l’aviation ainsi que les ententes « ciel ouvert ». Puis, dans un second temps nous procéderons à l’analyse du cadre règlementaire spécifique portant sur des aspects tels que l’environnement, les droits des passagers aériens, la sécurité et la sûreté. / The purpose of this study is to determine whether air transport in Europe is a shared competence between European Union (EU) and the Member States, or whether it is an a field under the jurisdiction of the EU in this specific area. We will review the EU regulatory framework on air transport in Europe. Initially, we will focus on issues concerning aviation in general in Europe, such as the establishment of a single market for aviation and "open skies" agreements. Then, we will analyze the specific regulatory framework such as the environment, protection of air passengers, the security and safety.

Through a history of more than 50 years, the results of mathematical models have shown that controller workload is being driven by the complexity involved in the airspace environment. Part of this complexity is prompted by the dynamical behavior of traffic patterns. From the results of models describing controller’s workload, it is observed that predictability decreases the complexity. Therefore, the general idea behind this topic is to analyze how a specific notion of predictability influences the controller’s workload. This specific notion in this research is a type of automation that aircraft benefit from. In a more specific sense, the goal of this research was to analyze how the controllers handle the air traffic in different complex situations when exposed to different automation levels. The following dilemmas are focused through this work: - Information visualization of controllers’ interaction with radar screen - Quantification of dynamics of air traffic patterns - Modeling and quantification of controllers’ workload First, in order to have a grasp of the controllers’ interaction with the air traffic patterns, the controllers’ activities on the radar screen have been visualized in chapter 2. The visualization results for different automated conditions have been analyzed. Based on such analysis the criteria for problem space has been addressed and the main research question is identified. Next in chapter 3, the airspace complexity caused by air traffic flow has been studied and a set of known complexity factors are quantified using a novel calculation approach. With a logistics perspective toward airspace complexity, to calculate each complexity factor, a mathematical formulation has been used and the effects of each corresponding factor on controllers’ workload are addressed. Then in chapter 4, a novel approach toward modeling controller’s workload is presented. After implementing the model on 18 different scenarios, a model for controller’s workload has been developed in which around 60 percent of the en-route air traffic complexity values and around 80 percent of terminal air traffic complexity values could be well-matched with the workload values. From statistical point of view, the results are very much acceptable for experiments in which human factors are involved. Cognitive load has not been considered in the workload model which is the focus of a future work. Later on in chapter 5, the results for each complexity factor as well as workload models are analyzed and discussed for each sector separately. Based on the airspace complexity results, areas where traffic situation had become complex were identified and the controller’s response to different situations are discussed. For each complexity factor as well as workload, the results for three different scenarios featuring different automation levels for two en-route and terminal sectors are compared. At last in chapter 6, the main ideas are discussed, thesis conclusions are presented and possible future work is suggested.

Made available in DSpace on 2016-04-25T18:39:39Z (GMT). No. of bitstreams: 1 Luiz Henrique Valerio.pdf: 823907 bytes, checksum: 6ca8bd9d955c007eb4b9b6590f57ee4d (MD5) Previous issue date: 2011-05-30 / The increasing adoption of the international financial reporting standards (IFRS) is the result of changes occurred in the last two decades, economy globalization, and the development of international markets. Due to the increased demand for information that allows foreign investors to compare the results of its investments in several companies of different countries with different standards, the adoption of a single accounting standard, globally accepted, became necessary. The International Accounting Standard Board (IASB) was responsible for the preparation of international standards whose process of convergence is already occurring in over 100 countries worldwide. Brazil, with the enactment of Law 11638/07, effective beginning as of January 1, 2008, and subsequent amendments introduced by Law 11941/09, took an important step in the convergence of its standards with international standards through the creation of the Accounting Pronouncements Committee (CPC), agency responsible for the issuance of accounting pronouncements in accordance with IFRS. IFRS 1, denominated First-Time Adoption, refers to the requirements for the first year the company discloses its financial statements pursuant to local accounting standards and IFRS. Accordingly, the purpose of this study is to verify whether in the air transportation industry, the first-time adoption of IFRS 1 resulted in significant changes in the main financial indicators and which are the impacts of IFRS adoption to the organization as a whole. For this, a research methodology that contemplates the study of an exploratory multiple case with a direct study of the companies information was chosen to characterize it and obtain the required data for the research. The comparative analysis of the financial statements of the companies that are the object of this study and the results obtained from the questionnaire and interviews indicated that financial statements prepared in accordance with IFRS present a higher disclosure level than those financial statements prepared in accordance with BRGAAP. We concluded that the adoption of IFRS impacts not only financial indicators, but several processes and controls of the companies as a whole / A adoção crescente das normas internacionais de contabilidade (IFRS) é o reflexo das mudanças ocorridas nas últimas duas décadas, no processo de globalização da economia e do desenvolvimento dos mercados internacionais. Em função do aumento da demanda por informações, que permitam ao investidor estrangeiro comparar o resultado dos seus investimentos entre empresas de diferentes países e diferentes normas, se fez necessário a adoção de um padrão único de contabilidade aceito mundialmente. O IASB (International Accounting Standard Board) ficou responsável pela elaboração de normas internacionais que já estão em processo de convergência em mais de 100 países em todo o mundo. No Brasil com a publicação da Lei nº 11.638/07, vigorando a partir de 1º de janeiro de 2008 e, posteriormente, com as alterações emanadas da Lei nº 11.941/09, deu-se um importante passo no processo de convergência de suas normas com os padrões internacionais, por meio da criação do Comitê de Pronunciamentos Contábeis (CPC), órgão responsável pela emissão de pronunciamentos contábeis em consonância com as IFRS. A IFRS 1, denominada First-Time Adoption refere se aos requisitos a serem observados no primeiro exercício em que a empresa publica as suas demonstrações financeiras, em norma contábil local e em IFRS. Com esta justificativa, este estudo tem por objetivo verificar se no ramo de transporte aéreo, com a primeira adoção das normas internacionais IFRS 1 First-Time Adoption, houve mudanças significativas, nos principais indicadores econômico-financeiros e quais os impactos da adoção do IFRS para a organização como um todo. Para tanto foi escolhida metodologia de pesquisa que contempla estudo de caso múltiplo exploratório que contempla um estudo direto com as informações das empresas para sua caracterização e obtenção dos dados necessários à pesquisa. A análise comparativa das demonstrações financeiras das empresas objeto deste estudo e dos resultados obtidos pelo questionário e entrevistas apontam que as demonstrações financeiras preparadas de acordo com as IFRS apresentam um nível de divulgação maior quando comparadas com as demonstrações financeiras em BR-GAAP. A conclusão obtida é que o processo de adoção do IFRS gera impactos não só nos indicadores econômico-financeiros, mas também impactos em diversos processos e controles das companhias como um todo

Made available in DSpace on 2016-04-25T18:39:50Z (GMT). No. of bitstreams: 1 Luciano Aparecido dos Santos.pdf: 931046 bytes, checksum: 9a7552d3cb9b9621ebbb5cf772fb8851 (MD5) Previous issue date: 2012-08-06 / As a reflex of the changes happened in the last decades in the process of globalization of the economy and of the development of the international markets, it was necessary a change in the process of generation of the accounting information in which accounting has been pressed by the demands of new markets, its potential investors and analysts to supply financial statements in an efficient and effective way for the best interpretation and decision in this market in high performance. As we insert the accounting in this globalization context, the accounting information becomes more and more relevant and of great importance in the decision process. Faced with the economic globalization of the markets, it is necessary the adoption of rules and accounting patterns globally used and accepted, allowing a comparative of the accounting information for the decisorial process. The IASB (International Accounting Standard Board) was responsible for the elaboration of international rules already in convergence process in more than 100 countries all over the world. In Brazil, with the publication of the Law number 11.638/07, being in force from January 1st, 2008, and later with the changes coming from the Law number 11.941/09, there was an important step in the process of convergence of their rules with the international patterns through the creation of the Committee of Accounting Pronouncements (CPC), responsible organ for the emission of accounting pronouncements in consonance with the International Financial Reporting Standards (IFRS). This study aims to identify the materiality of the impacts of the adoption of the International Financial Reporting Standards (IFRS) in financial statements and in companies performance, presenting the significant differences in accounts of Balance Sheet and of Incoming Statement, aiming to answer to the central question: Has the adoption of International Financial Reporting Standards (IFRS) generated impact on Equity and Profit and Loss Statement of the open capital entities listed in BOVESPA, Air Transport segment? To such purpose, it was chosen the methodology of research and of exploratory nature with descriptive studies, which provides to the researcher a larger inclusion of the occurred facts in relation to a direct research. The comparative analysis of the financial statements of the companies object of this study demonstrates that the financial statements elaborated in agreement with the International Financial Reporting Standards (IFRS) present a larger level of disclosure when compared with the old adopted pattern BR GAAP (Generally Accepted Accounting Principles). The obtained conclusion is that the process of adoption of the International Financial Reporting Standards (IFRS) has generated impacts in the Equity and Profit and Loss Statement and in several processes and controls of the companies object of this study / Como reflexo das mudanças ocorridas nas últimas décadas no processo de globalização da economia e do desenvolvimento dos mercados internacionais, fez-se necessário uma mudança no processo de geração das informações contábeis, em que a contabilidade tem sido pressionada por meio das exigências dos novos mercados, seus potenciais investidores e analistas a fornecer demonstrações contábeis de forma eficiente e eficaz para a melhor interpretação e tomada de decisões neste mercado em alta performance. Ao inserirmos a contabilidade neste contexto de globalização, a informação contábil torna-se cada vez mais relevante e de suma importância no processo decisório. Frente à globalização econômica dos mercados, faz-se necessária a adoção de normas e padrões contábeis utilizados e aceitos mundialmente, permitindo um comparativo das informações contábeis para o processo decisorial. O IASB (International Accounting Standard Board) ficou responsável pela elaboração de normas internacionais que já estão em processo de convergência em mais de 100 países em todo o mundo. No Brasil, com a publicação da Lei n.º 11.638/07, vigorando a partir de 1.º de janeiro de 2008, e, posteriormente, com as alterações emanadas da Lei n.º 11.941/09, deu-se um importante passo no processo de convergência de suas normas com os padrões internacionais por meio da criação do Comitê de Pronunciamentos Contábeis (CPC), órgão responsável pela emissão de pronunciamentos contábeis em consonância com as Normas Internacionais de Contabilidade (IFRS). O estudo tem por objetivo identificar a materialidade dos impactos da adoção das Normas Internacionais de Contabilidade (IFRS) nas demonstrações contábeis e no desempenho das empresas, apresentando as diferenças significativas em contas do Balanço Patrimonial e da Demonstração de Resultados, buscando responder à questão-problema: A adoção das Normas Internacionais de Contabilidade (IFRS) gerou impacto no Patrimônio Líquido e no Resultado do Exercício das Entidades de capital aberto listadas na BOVESPA do segmento de Transporte Aéreos? Para tanto, foi escolhida a metodologia de pesquisa de natureza exploratória com estudos descritivos, que proporciona ao pesquisador uma maior cobertura dos fatos ocorridos em relação a uma pesquisa direta. A análise comparativa das demonstrações contábeis das empresas-objeto deste estudo evidencia que as demonstrações financeiras elaboradas de acordo com os padrões IFRS apresentam um nível de divulgação maior quando comparadas com o antigo padrão adotado BR GAAP. A conclusão obtida é que o processo de adoção das Normas Internacionais de Contabilidade (IFRS) gerou impactos no Patrimônio Líquido e no Resultado do Exercício e em diversos processos e controles das empresas-objeto de estudo

L’objet de ce travail vise à déterminer si le transport aérien en Europe relève d’une compétence partagée entre l’Union européenne (UE) et les États membres, ou s’il s’agit plutôt d’une occupation du terrain par l’UE dans cette matière ? Ainsi, nous verrons en quoi consiste le cadre règlementaire communautaire portant sur le transport aérien en Europe. Dans un premier temps, nous porterons notre attention sur des aspects généraux entourant l’aviation en Europe, comme par exemple la mise en place d’un marché unique de l’aviation ainsi que les ententes « ciel ouvert ». Puis, dans un second temps nous procéderons à l’analyse du cadre règlementaire spécifique portant sur des aspects tels que l’environnement, les droits des passagers aériens, la sécurité et la sûreté. / The purpose of this study is to determine whether air transport in Europe is a shared competence between European Union (EU) and the Member States, or whether it is an a field under the jurisdiction of the EU in this specific area. We will review the EU regulatory framework on air transport in Europe. Initially, we will focus on issues concerning aviation in general in Europe, such as the establishment of a single market for aviation and "open skies" agreements. Then, we will analyze the specific regulatory framework such as the environment, protection of air passengers, the security and safety.