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You searched for subject:(Congested traffic networks). Showing records 1 – 2 of 2 total matches.

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1. Bertoncini, Bruno Vieira. Uma proposta de carregamento incremental de fluxos veiculares para a estimação de matriz O-D sintética.

Degree: Mestrado, Planejamento e Operação de Sistemas de Transportes, 2007, University of São Paulo

Neste trabalho é proposto um método de carregamento incremental dos fluxos veiculares para a estimação de matriz O-D sintética. A principal motivação para o desenvolvimento deste trabalho está na complexidade dos métodos de estimação de matriz sintética pelo método iterativo, que tem conduzido a resultados não satisfatórios. O método de carregamento incremental, ora proposto neste trabalho, pode ser definido como o inverso do método de alocação incremental de viagens aos arcos de uma rede viária. A matriz O-D obtida com este método é o resultado da soma sucessiva das sub-matrizes estimadas através das parcelas dos fluxos observados nos arcos da rede. Este método pode ser aplicado em qualquer tipo de rede viária: congestionada ou não congestionada e com ou sem continuidade de fluxo. Para verificação do desempenho do método foram realizados testes experimentais, nos quais os resultados obtidos foram comparados com os valores observados. O desempenho do método incremental não se mostrou satisfatório. Assim, com o intuito de verificar a sua utilidade como um método alternativo os mesmos dados foram processados através de dois métodos iterativos. Os resultados mostraram que os erros são ainda maiores do que os obtidos pelo método proposto. A principal conclusão deste trabalho é que o método incremental pode ser usado como uma alternativa aos métodos iterativos.

A synthetic O-D matrix estimation method, based on incremental loading of traffic flow, was proposed in this work. This research was motivated because of the complexity of the iterative methods for synthetic matrix estimation that might produce bias accumulation in the results. The referred incremental loading method could be defined as the inverse of the incremental assignment method for trips to links of a traffic network. The O-D matrix is gathered by successively summing the sub-matrices obtained from parts of the traffic flow counted on the links of the traffic network. This method could be applied to any traffic networks: congested or uncongested and with or without volumetric continuity. As a part of verification proceeding, several experimental tests were carried out to evaluate the method performance. In these tests the estimated results were compared with the real values. These results show that the incremental loading method performance was not satisfactory. Thus, aiming to test the utility of the incremental method, a second round of experimental tests was conducted to evaluate two iterative methods. In these second round tests, the results show that theses methods performance was worse those of the incremental method. The main conclusion of this work is that the incremental loading method for synthetic matrices estimation could be used as an alternative to the iterative methods.

Advisors/Committee Members: Kawamoto, Eiji.

Subjects/Keywords: Carregamento incremental; Congested traffic networks; Estimação de matrizes O-D; Estimation of O-D matrices; Fluxos de veículos; Incremental loading; O-D trip table; Planejamento de transportes; Rede viária congestionada; Rede viária não-congestionada; Traffic flows; Transportation planning; Uncongested traffic networks

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Bertoncini, B. V. (2007). Uma proposta de carregamento incremental de fluxos veiculares para a estimação de matriz O-D sintética. (Masters Thesis). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/18/18144/tde-11042007-143530/ ;

Chicago Manual of Style (16th Edition):

Bertoncini, Bruno Vieira. “Uma proposta de carregamento incremental de fluxos veiculares para a estimação de matriz O-D sintética.” 2007. Masters Thesis, University of São Paulo. Accessed September 19, 2020. http://www.teses.usp.br/teses/disponiveis/18/18144/tde-11042007-143530/ ;.

MLA Handbook (7th Edition):

Bertoncini, Bruno Vieira. “Uma proposta de carregamento incremental de fluxos veiculares para a estimação de matriz O-D sintética.” 2007. Web. 19 Sep 2020.

Vancouver:

Bertoncini BV. Uma proposta de carregamento incremental de fluxos veiculares para a estimação de matriz O-D sintética. [Internet] [Masters thesis]. University of São Paulo; 2007. [cited 2020 Sep 19]. Available from: http://www.teses.usp.br/teses/disponiveis/18/18144/tde-11042007-143530/ ;.

Council of Science Editors:

Bertoncini BV. Uma proposta de carregamento incremental de fluxos veiculares para a estimação de matriz O-D sintética. [Masters Thesis]. University of São Paulo; 2007. Available from: http://www.teses.usp.br/teses/disponiveis/18/18144/tde-11042007-143530/ ;


Mississippi State University

2. Mahmoud, Anas M. TRAVEL TIME ESTIMATION IN CONGESTED URBAN NETWORKS USING POINT DETECTORS DATA.

Degree: MS, Computer Science and Engineering, 2009, Mississippi State University

A model for estimating travel time on short arterial links of congested urban networks, using currently available technology, is introduced in this thesis. The objective is to estimate travel time, with an acceptable level of accuracy for real-life traffic problems, such as congestion management and emergency evacuation. To achieve this research objective, various travel time estimation methods, including highway trajectories, multiple linear regression (MLR), artificial neural networks (ANN) and K nearest neighbor (K-NN) were applied and tested on the same dataset. The results demonstrate that ANN and K-NN methods outperform linear methods by a significant margin, also, show particularly good performance in detecting congested intervals. To ensure the quality of the analysis results, set of procedures and algorithms based on traffic flow theory and test field information, were introduced to validate and clean the data used to build, train and test the different models. Advisors/Committee Members: Dr. Eric A. Hansen (chair), Dr. Li Zhang (committee member), Dr. Julian E. Boggess (committee member).

Subjects/Keywords: Travel time; Congested Networks; Computer science; Artificial Intelligence; Intelligent Transportation systems; Neural Networks; point detectors; Multiple linear regression; Matlab; Estimation; K nearest neighbors; congestions; data cleaning; traffic detectors; emergency evacuation; GPS

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Mahmoud, A. M. (2009). TRAVEL TIME ESTIMATION IN CONGESTED URBAN NETWORKS USING POINT DETECTORS DATA. (Masters Thesis). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-04022009-163043/ ;

Chicago Manual of Style (16th Edition):

Mahmoud, Anas M. “TRAVEL TIME ESTIMATION IN CONGESTED URBAN NETWORKS USING POINT DETECTORS DATA.” 2009. Masters Thesis, Mississippi State University. Accessed September 19, 2020. http://sun.library.msstate.edu/ETD-db/theses/available/etd-04022009-163043/ ;.

MLA Handbook (7th Edition):

Mahmoud, Anas M. “TRAVEL TIME ESTIMATION IN CONGESTED URBAN NETWORKS USING POINT DETECTORS DATA.” 2009. Web. 19 Sep 2020.

Vancouver:

Mahmoud AM. TRAVEL TIME ESTIMATION IN CONGESTED URBAN NETWORKS USING POINT DETECTORS DATA. [Internet] [Masters thesis]. Mississippi State University; 2009. [cited 2020 Sep 19]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-04022009-163043/ ;.

Council of Science Editors:

Mahmoud AM. TRAVEL TIME ESTIMATION IN CONGESTED URBAN NETWORKS USING POINT DETECTORS DATA. [Masters Thesis]. Mississippi State University; 2009. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-04022009-163043/ ;

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