Search results for "SYSTEMS"
showing 10 items of 11952 documents
The periodic rural postman problem with irregular services on mixed graphs
2019
Abstract In this paper, we deal with an extension of the rural postman problem in which some links of a mixed graph must be traversed a given number of times over a time horizon. These links represent entities that must be serviced a specified number of times in some subsets of days (or periods) of the time horizon. The aim is to design a set of minimum-cost tours, one for each day/period of the time horizon, that satisfy the service requirements. We refer to this problem as the periodic rural postman problem with irregular services (PRPP–IS). Some practical applications of the problem can be found in road maintenance operations and road network surveillance, for example. In order to solve …
SAFETY CONSIDERATIONS ON TEENAGE PEDESTRIAN-BUS IMPACT
2019
This work studies the impact conditions between the adolescent pedestrian and the bus focusing on head and chest injury. The injury to the head is analyzed using both the Head Injury Criterion (HIC) 36 and the HIC15 parameters as established by the most advanced legislation and comparing the risk probability Abbreviated Injury Scale (AIS3+) and AIS4+. The parameter HIC15 gives a higher probability of risk with lower values, and therefore it can be considered more conservative. Moreover, the study of chest injury is performed with two different biomechanical parameters: the Thoracic Trauma Index (TTI) and the TTI(d); the last neglects the pedestrian mass. The results indicate that the param…
Using UAV Based 3D Modelling to Provide Smart Monitoring of Road Pavement Conditions
2020
Road pavements need adequate maintenance to ensure that their conditions are kept in a good state throughout their lifespans. For this to be possible, authorities need efficient and effective databases in place, which have up to date and relevant road condition information. However, obtaining this information can be very difficult and costly and for smart city applications, it is vital. Currently, many authorities make maintenance decisions by assuming road conditions, which leads to poor maintenance plans and strategies. This study explores a pathway to obtain key information on a roadway utilizing drone imagery to replicate the roadway as a 3D model. The study validates this by using stru…
Availability, demand, perceived constraints and disuse of ADAS technologies in Spain: findings from a national study
2019
Advanced Driver Assistance Systems (ADAS), created for enhancing the driving experience and actively preventing road crashes, have been progressively incorporated in vehicle designing essentially during the last decade. However, the literature has shown how some of these assisting technologies are not used by drivers in tandem with their potential. The aims of this study were, first, to examine the availability and demand of ADAS technologies among Spanish drivers and, secondly, to explore the perceived constraints and discouraging reasons for avoiding the use of ADAS available in their vehicles. For this national cross-sectional study, data from 1,207 Spanish drivers were analyzed. The res…
Critical realism and ICT4D: editorial introduction to the special issue of EJISDC
2018
Politiques éducatives et analyse des inégalités : de quelques vertus heuristiques des comparaisons franco-britanniques
2001
Dans cet article, l'auteur entend demontrer le caractere stimulant des comparaisons effectuees entre la France et l'Angleterre, qui permettent, en pointant quelques registres ou la comparaisonn bouscule la facon de penser les inegalites et les politiques educatives, d'analyser les inegalites de carrieres scolaires.
Contribución de la comunicación institucional de la investigación a su impacto y visibilidad. Caso de la Universidad Carlos III de Madrid
2020
Institutional offices for the communication and dissemination of science are gaining in importance at Spanish universities, and their activities can contribute to increasing the visibility and reputation of researchers. The objective of this study is to analyze the relations between the institutional communication of research results to the public and the impact and academic visibility of scientific papers. For this purpose, science communication and dissemination undertaken through press releases on R+D+i results from the Science Culture and Innovation Unit (SCIU) at Universidad Carlos III de Madrid (UC3M) were selected as a case study. This SCIU was chosen because it has published yearly …
Perfil sociodemográfico y actitudes políticas de los grupos a favor y en contra de limitar la libre circulación de información durante la pandemia
2020
The Covid-19 pandemic has produced not only a terrible sanitary crisis but also several problems related to the circulation of disinformation in the context of hybrid and increasingly fragmented media systems. In this work, we analyze a polemical question included in the Center for Sociological Research (CIS) survey conducted in April about the appropriateness of limiting free circulation of information to avoid diffusion of fake news and disinformation. The goals are to (1) analyze the sociodemographic traits of those in favor of limiting the free circulation of information, and (2) explore their general political preferences and affiliations, and the association with attitudes regarding f…
El periodista adaptativo. Consultores y directores de innovación analizan las cualidades del profesional de la comunicación
2016
Desde 2014 los medios de comunicación ya no luchan sólo por sobrevivir. Fundan departamentos de innovación y organizan hackatones para desarrollar nuevos productos, iniciativas que demuestran que el periodismo está mudando su piel, y vive un momento de oportunidades. Atraviesan un proceso de transición, y requieren de perfiles profesionales proactivos y flexibles que conversan con la audiencia, producen informaciones multimedia con sus móviles, utilizan puntualmente drones e incluso realizan documentales informativos con realidad aumentada. En este artículo una decena de consultores y directores de innovación que ejercen su actividad en España, Estados Unidos y Latinoamérica analizan las nu…
Children's Learning of Unfamiliar Phonological Sequences
1971
4 groups of 15 4-, 6-, 8-, and 10-yr.-old children learned nonsense phonological sequences that varied in grammaticality by violating 0, 1, or 2 phonological rules of Ss' native language. The youngest age group made fewer errors in learning the most nongrammatical phonological sequences than in learning grammatical ones. With the 10- and 8-yr.-olds an opposite trend was found. The differences were not statistically significant. Implications for second language learning were discussed.