Articles de revista
http://hdl.handle.net/2117/186840
2024-03-19T06:47:13ZOperational cost and user performance analysis of on-demand bus and taxi systems
http://hdl.handle.net/2117/341839
Operational cost and user performance analysis of on-demand bus and taxi systems
Estrada Romeu, Miguel Ángel; Salanova Grau, Josep Maria; Medina Tapia, Marcos; Robusté Antón, Francesc
This paper presents the optimization problem of three different on-demand transit systems operated by vehicles of different sizes. This problem is aimed at minimizing the total cost of the system, which consists of the temporal cost experienced by users and the operating cost incurred by transit agencies. A compact set of estimations of the user performance and operating cost is provided, based on geometric probability. The optimization procedure allows the cost comparison of different semi-flexible services. Transit systems operated by cars (shared taxicabs) with flexible layouts are preferable for low demand densities (less than 92 pax/km2-h). For very high demand (higher than 200 pax/km2-h), bus systems with fixed layout and variable stop locations present the lowest total cost per passenger. In an intermediate domain, taxi and semi-flexible services compete among each other. The estimation of unit operating costs allows decision-makers to calculate the subsidies needed to make the system profitable.
2021-03-16T17:43:45ZEstrada Romeu, Miguel ÁngelSalanova Grau, Josep MariaMedina Tapia, MarcosRobusté Antón, FrancescThis paper presents the optimization problem of three different on-demand transit systems operated by vehicles of different sizes. This problem is aimed at minimizing the total cost of the system, which consists of the temporal cost experienced by users and the operating cost incurred by transit agencies. A compact set of estimations of the user performance and operating cost is provided, based on geometric probability. The optimization procedure allows the cost comparison of different semi-flexible services. Transit systems operated by cars (shared taxicabs) with flexible layouts are preferable for low demand densities (less than 92 pax/km2-h). For very high demand (higher than 200 pax/km2-h), bus systems with fixed layout and variable stop locations present the lowest total cost per passenger. In an intermediate domain, taxi and semi-flexible services compete among each other. The estimation of unit operating costs allows decision-makers to calculate the subsidies needed to make the system profitable.Modeling public transportation networks for a circular city: the role of urban subcenters and mobility density
http://hdl.handle.net/2117/189454
Modeling public transportation networks for a circular city: the role of urban subcenters and mobility density
Medina Tapia, Marcos; Robusté Antón, Francesc; Estrada Romeu, Miguel Ángel
The concentration of both employment and services in a specific area of a town generates positive effects, but also impacts (congestion, transit issues, and others). Urban subcenters seek to approach economic activities to residents in peripheral urban spaces. The objective of this research is to evaluate the contribution to the mobility of implementing urban subcenters in a city. The model has a total cost function (users and agency costs) on a circular city (ring and radial routes) formulated using the continuous approximation method. The model solution addresses with mathematical optimization. The model evaluates a BRT network applied to scenarios of urban subcenters. The results of the modeling show that the implementation of subcenters obtains savings of 3.5% in rush hour. Thus, this strategy of urban planning generates improvements in the functioning of a public transportation system. Moreover, the maximum benefits are obtained in medium-sized subcenters in comparison to the CBD, which allows balancing user and agency costs. Therefore, the outcomes may be better with an urban pattern with subcenters, and a transit scheme adapted to the demand needs.
2020-05-29T11:22:09ZMedina Tapia, MarcosRobusté Antón, FrancescEstrada Romeu, Miguel ÁngelThe concentration of both employment and services in a specific area of a town generates positive effects, but also impacts (congestion, transit issues, and others). Urban subcenters seek to approach economic activities to residents in peripheral urban spaces. The objective of this research is to evaluate the contribution to the mobility of implementing urban subcenters in a city. The model has a total cost function (users and agency costs) on a circular city (ring and radial routes) formulated using the continuous approximation method. The model solution addresses with mathematical optimization. The model evaluates a BRT network applied to scenarios of urban subcenters. The results of the modeling show that the implementation of subcenters obtains savings of 3.5% in rush hour. Thus, this strategy of urban planning generates improvements in the functioning of a public transportation system. Moreover, the maximum benefits are obtained in medium-sized subcenters in comparison to the CBD, which allows balancing user and agency costs. Therefore, the outcomes may be better with an urban pattern with subcenters, and a transit scheme adapted to the demand needs.The house on the cliff. Materiality and horizon: between smooth and striated. La Móra, Tarragona. Spain
http://hdl.handle.net/2117/186839
The house on the cliff. Materiality and horizon: between smooth and striated. La Móra, Tarragona. Spain
Fernández González, Mario
The development of this project aims to re-establish this primitive and sensitive connection in intimate relation with the landscape. Thus, Sverre Fehn and Jorn Utzon use conceptual mechanisms such as platforms and the horizon with which they design and work to initiate a relationship that involves idea-concept, language and design in relation to the landscape, revealing the respect and dialogue tied to it, giving the place quality and sensations linked with the visual domain on the immediate and territorial landscape. In a certain way, the project that is presented follows this idea, to turn the gaze to the horizon, housing and involving the users of the landscape to which they are linked, looking to the sea horizon that establishes juxtapositions while creating tension between the close and the distant, between the physical and ethereal, between the perceptive and haptic, between the conscious and unconscious, between the learnt and the experienced, searching for that contact but also that confrontation - as S. Fehn would say – with nature itself for the shaping and characterization of the place.
2020-05-08T12:25:12ZFernández González, MarioThe development of this project aims to re-establish this primitive and sensitive connection in intimate relation with the landscape. Thus, Sverre Fehn and Jorn Utzon use conceptual mechanisms such as platforms and the horizon with which they design and work to initiate a relationship that involves idea-concept, language and design in relation to the landscape, revealing the respect and dialogue tied to it, giving the place quality and sensations linked with the visual domain on the immediate and territorial landscape. In a certain way, the project that is presented follows this idea, to turn the gaze to the horizon, housing and involving the users of the landscape to which they are linked, looking to the sea horizon that establishes juxtapositions while creating tension between the close and the distant, between the physical and ethereal, between the perceptive and haptic, between the conscious and unconscious, between the learnt and the experienced, searching for that contact but also that confrontation - as S. Fehn would say – with nature itself for the shaping and characterization of the place.