Abstract

Scientific social networks are a new meeting place for researchers and a major instrument for the promotion of knowledge. Their use is increasing in the scientific community, as they are practical tools to disseminate research results and to share knowledge. This paper examines the presence of 77 Spanish universities in the two main scientific social networks (ResearchGate and Academia.edu). The results show that, despite the continuous development that those networks are having worldwide, the number of Spanish members in them is considered insufficient and in some universities is almost anecdotal. These results should be the starting point for an action program of the universities to increase the membership of their academic staff in those networks, as part of their mission of disseminating knowledge.

Abstract

This article presents the results of a national research project, MapCom: “The research structure on the social practices of Communication in Spain. Map of projects, groups, lines, objects of study and methods.” (Reference code CSO2013-47933- C4-1P). This project was funded by the Research Excellence Program at the Ministry of Economy and Competitiveness in Spain, spanning the period of 2013 to 2016. We present the results obtained in Area I (Center) using a representative sample of doctoral theses and of all Spanish research projects in the areas of social sciences and humanities whose object of study comprised any socially relevant dimension of the practices of “Communication” between the 1st of January 2007 to the 31st of October 2014, undertaken within Spanish universities. We contextualize by using a comparative analysis of research in social sciences and humanities in Spain. The analysis concludes with the finding of similarities between the objects of study, but also of the differences between the investigations’ objectives when we compare doctoral theses and R&D projects.

Abstract

Traffic congestion is increasing in almost all large cities, leading to a number of negative effects such as pollution and delays. However, building new roads is not a feasible solution. Instead, the use of the existing road network has to be optimized, together with a shift towards more sustainable transport modes. In order to achieve this there are several challenges that needs to be addressed. One challenge is the ability to provide accurate information about the current and future traffic state. This information is an essential input to the traffic management center and can be used to influence the choices made by the travelers. Accurate information about the traffic state on highways, where the potential to manage and control the traffic in general is very high, would be of great significance for the traffic managers. It would help the traffic managers to take action before the system reaches congestion and limit the effects of it. At the same time, the collection of traffic data is slowly shifting from fixed sensors to more probe based data collection. This requires an adaptation and further development of the traditional traffic models in order for them to handle and take advantage of the characteristics of all types of data, not just data from the traditionally used fixed sensors. The objective of this thesis is to contribute to the development and implementation of a model for estimation and prediction of the current and future traffic state and to facilitate an adaptation of the model to the conditions of the highway in Stockholm. The model used is a version of the Cell Transmission Model (CTM-v) where the velocity is used as the state variable. Thus, together with an Ensemble Kalman Filter (EnKF) it can be used to fuse different types of point speed measurements. The model is developed to run in real-time for a large network. Furthermore, a two-stage process used to calibrate the model is implemented. The results from the calibration and validation show that once the model is calibrated, the estimated travel times corresponds well with the ground truth travel times collected from Bluetooth sensors. In order to produce accurate short-term predictions for various networks and conditions it is vital to combine different methods. We have implemented and evaluated a hybrid prediction approach that assimilates parametric and non-parametric short-term traffic state prediction. To predict mainline sensor data we use a neural network, while the CTM-v is ran forward in time in order to predict future traffic states. The results show that both the hybrid approach and the CTM-v prediction without the additional predicted mainline sensor data is superior to a naïve prediction method for longer prediction horizons.