The origin-destination matrix is an important source of information describing transport demand in a region. Most commonly used methods for matrix estimation use link volumes collected on a subset of links in order to update an existing matrix. Traditional volume data collection methods have significant shortcomings because of the high costs involved and the fact that detectors only provide status information at specified locations in the network. Better matrix estimates can be obtained when information is available about the overall distribution of traffic through time and space. Other existing technologies are not used in matrix estimation methods because they collect volume data aggregated on groups of links, rather than on single links. That is the case of mobile systems. Mobile phones sometimes cannot provide location accuracy for estimating flows on single links but do so on groups of links; in contrast, data can be acquired over a wider coverage without additional costs. This paper presents a methodology adapted to the concept of volume aggregated on groups of links in order to use any available volume data source in traditional matrix estimation methodologies. To calculate volume data, we have used a model that has had promising results in transforming phone call data into traffic movement data. The proposed methodology using vehicle volumes obtained by such a model is applied over a large real network as a case study. The experimental results reveal the efficiency and consistency of the solution proposed, making the alternative attractive for practical applications. MAE, mean absolute error; MARE, mean absolute relative error; MedARE, median absolute relative error. 662 N. CACERES ET AL.Figure 4. Correlation between observed and modelled aggregate volumes of groups of links crossing inter-cell boundaries by assigning (a) the prior O-D matrix and (b) the adjusted one. 664 N. CACERES ET AL.
RESUMENEl presente trabajo reviste un esfuerzo particular por iniciar el tema del "pensamiento reflexivo en Fonoaudiólogos formadores de Fonoaudiólogos". Se revisan los conceptos de "pensamiento reflexivo" y "práctica reflexiva" así como también marcos teóricos con un sistema de clasificación de niveles de reflexión de racionalidad técnica, práctica y crítica. Se propone además, la aplicación en el ámbito fonoaudiológico de un tipo de capacitación de desarrollo de la práctica reflexiva.Palabras Clave: Pensamiento reflexivo, práctica reflexiva.
ABSTRACTThe present manuscript represents a specific effort on the commencement of "reflexive thought among speech pathologists who are involved in teaching students enrolled in Speech and Hearing Sciences Programmes". The concepts of "reflexive thought" and "reflexive practice" as well as a literature review with a system of classification of levels of reflexion of technical, practical and critical rationality are addressed. Also, the utilisation, within the field of speech and hearing sciences, of a type of training on the development of the reflexive practice is proposed.
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