Exploració per autor "Ortego Martínez, María Isabel"
Ara es mostren els items 9-28 de 36
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Changes in the occurrence of extreme wave storms in the Catalan coast: a Bayesian approach
Corral López, Jesús; Ortego Martínez, María Isabel (Universitat de Barcelona. Edicions i Publicacions, 2016)
Comunicació de congrés
Accés restringit per política de l'editorial -
Characterizing the evolution of the container traffic share in the mediterranean sea using hierarchical clustering
Grifoll Colls, Manel; Karlis, Thanassis; Ortego Martínez, María Isabel (2018-12)
Article
Accés obertThis research investigates the traffic share evolution of the container throughput in the Mediterranean ports from 2000 to 2015 considering hierarchical clustering and concentration indexes. Compositional Data analysis ... -
Characterizing the evolution of the Yangtze River Delta multi-port system using compositional data techniques
Huang, Dong; Grifoll Colls, Manel; Feng, Hongxiang; Ortego Martínez, María Isabel; Zheng, Pengjun (2021-09-12)
Article
Accés obertThe Yangtze River Delta multi-port system (YMPS) receives increasing attention due to its relevance in world trade and excellent competitiveness in the container traffic market. To insight into the development pattern of ... -
Checking model-data weather hazard occurrence fit in the context of climate change
Tolosana Delgado, Raimon; Ortego Martínez, María Isabel; Egozcue Rubí, Juan José; Sánchez-Arcilla Conejo, Agustín (2011)
Text en actes de congrés
Accés obertIn climate change impact studies it is common to run a given response model (from ecosystem changes to wavestorm or landslide occurrence) nested into one of the available long-term Global or Regional Circulation Models ... -
Climate change in a Point-Over-Threshold model: an example on ocean-wave-storm hazard in NE Spain
Tolosana Delgado, Raimon; Ortego Martínez, María Isabel; Egozcue Rubí, Juan José; Sánchez-Arcilla Conejo, Agustín (2010-09-27)
Article
Accés obertA reparametrization of the Generalized Pareto Distribution is here proposed. It is suitable to parsimoniously check trend assumptions within a Point-Over-Threshold model of hazardous events. This is based on considerations ... -
Compositional analysis approach in the measurement of social-spatial segregation trends. A case study of Guadalajara, Jalisco, Mexico
Cruz Sandoval, Marco Antonio; Ortego Martínez, María Isabel; Roca Bosch, Elisabet (2019)
Comunicació de congrés
Accés obertDifferent authors have highlighted the internal existing social differences in cities as a consequence of different economic, social and political forces. The mercantile logic that affects urban spaces incentives the ... -
Compositional data analysis approach in the measurement of social-spatial segregation: towards a sustainable and inclusive city
Cruz Sandoval, Marco Antonio; Roca Bosch, Elisabet; Ortego Martínez, María Isabel (2020-05-24)
Article
Accés obertThe location and context in which people live influences and conditions their opportunities in life. This becomes relevant in a world subject to rapid urban and demographic growth, in which different economic, social, and ... -
Compositional data for global monitoring: the case of drinking water and sanitation
Pérez Foguet, Agustí; Giné Garriga, Ricard; Ortego Martínez, María Isabel (2017-07)
Article
Accés obertIntroduction At a global level, access to safe drinking water and sanitation has been monitored by the Joint Monitoring Programme (JMP) of WHO and UNICEF. The methods employed are based on analysis of data from household ... -
Compositional data techniques for the analysis of the container traffic share in a multi-port region
Grifoll Colls, Manel; Ortego Martínez, María Isabel; Egozcue Rubí, Juan José (Springer, 2019-12)
Article
Accés obertThe statistical techniques based on compositional data are applied to investigate the evolution of the traffic share of the container throughput in a multi-port system. Compositional vectors are those which contain relative ... -
Developing personas to improve understanding of users’ needs in digital mobility: An experience of the DIGNITY project in the Barcelona Metropolitan Area
Wybraniec, Bartosz Maciej; Ortego Martínez, María Isabel; Roca Bosch, Elisabet; Goodman-Deane, Joy; Nesterova, Nina (Elsevier, 2023)
Comunicació de congrés
Accés obertThis paper contributes to the understanding of the end users’ needs and capabilities in digital mobility by presenting a set of personas developed using data from a population-representative survey conducted among 601 ... -
Differences in assigning probabilities to coastal inundation hazard estimators: event versus response approaches
Sanuy Vázquez, Marc; Jiménez Quintana, José Antonio; Ortego Martínez, María Isabel; Toimil Silva, Alexandra (2020-01)
Article
Accés obertCoastal flood risk assessment requires a reliable estimation of the frequency of inundation hazards, that is, characterising the hazard magnitude and assigning a probability of occurrence. In this work we analyse the ... -
Estimación bayesiana de cópulas extremales en procesos de Poisson
Ortego Martínez, María Isabel (Universitat Politècnica de Catalunya, 2015-02-04)
Tesi
Accés obertThe estimation of occurrence probabilities of extremal quantities is essential in the study of hazards associated with natural phenomena. The extremal quantities of interest usually correspond to phenomena characterized ... -
Evaluation of natural background levels of high mountain karst aquifers in complex hydrogeological settings. A Gaussian mixture model approach in the Port del Comte (SE, Pyrenees) case study
Herms Canellas, Joan Ignasi; Jódar, Jorge; Soler, Albert; Lambán, Javier; Custodio Gimena, Emilio; Nuñez, Joan Agustí; Arnó, Georgina; Ortego Martínez, María Isabel; Parcerisa Duocastella, David; Jorge, Joan (Elsevier, 2021-02)
Article
Accés obert -
Modelling of future extreme storm surges at the NW Mediterranean coast (Spain)
Lin Ye, Jue; García León, Manuel; Gracia Garcia, Vicente; Ortego Martínez, María Isabel; Lionello, Piero; Conte, Dario; Pérez Gómez, Begoña; Sánchez-Arcilla Conejo, Agustín (2020-02)
Article
Accés obertStorm surges are one of the main drivers for extreme flooding at the coastal areas. Such events can be characterized with the maximum level in an extreme storm surge event (surge peak), as well as the duration of the event. ... -
Modified Kolmogorov-Smirnov test of goodness of fit
Monti, Gianna S.; Mateu Figueras, Gloria; Ortego Martínez, María Isabel; Pawlowsky Glahn, Vera; Egozcue Rubí, Juan José (2017)
Text en actes de congrés
Accés obertA modified version of the Kolmogorov-Smirnov (KS) test is presented as a tool to assess whether a specified, although arbitrary, probability model is unsuitable to describe the underlying distribution of a set of observations. ... -
Multivariate hybrid modelling of future wave-storms at the northwestern Black Sea
Lin Ye, Jue; García León, Manuel; Gracia Garcia, Vicente; Ortego Martínez, María Isabel; Stanica, Adrian; Sánchez-Arcilla Conejo, Agustín (2018-02)
Article
Accés obertThe characterization of future wave-storms and their relationship to large-scale climate can provide useful information for environmental or urban planning at coastal areas. A hybrid methodology (process-based and statistical) ... -
Multivariate statistical modelling of future marine storms
Lin Ye, Jue; García León, Manuel; Gracia Garcia, Vicente; Ortego Martínez, María Isabel; Lionello, Piero; Sánchez-Arcilla Conejo, Agustín (2017-04)
Article
Accés obertExtreme events, such as wave-storms, need to be characterized for coastal infrastructure design purposes. Such description should contain information on both the univariate behaviour and the joint-dependence of storm-variables. ... -
Pluviometric regionalization of Catalunya: a compositional data methodology
Gibergans Bàguena, José; Ortego Martínez, María Isabel; Tolosana Delgado, Raimon (Centro Internacional de Métodos Numéricos en Ingeniería (CIMNE), 2011)
Text en actes de congrés
Accés obertThe aim of this paper is to introduce a methodology for de¯ning groups from regionalized com- positional data, through a hierarchical clustering algorithm aware of both the spatial dependence and the compositional character ... -
Pluviometric regionalization of Catalunya: a compositional data methodology
Gibergans Bàguena, José; Ortego Martínez, María Isabel; Tolosana Delgado, Raimon (CIMNE, 2011)
Text en actes de congrés
Accés obertThe aim of this paper is to introduce a methodology for de¯ning groups from regionalized com- positional data, through a hierarchical clustering algorithm aware of both the spatial dependence and the compositional character ... -
Relationship between popularity of key words in the Google browser and the evolution of worldwide financial indexes
ORTELLS SESÉ, ROBERT; Egozcue Rubí, Juan José; Ortego Martínez, María Isabel; Garola Crespo, Àlvar (2015)
Text en actes de congrés
Accés obertThe purpose of this contribution is to evaluate whether there is enough statistical basis to establish a relationship between the popularity of certain terms in the Google, Inc. browser and the evolution of several worldwide ...