Search results for " strategies."
showing 10 items of 467 documents
New behavioural trait adopted or rejected by observing heterospecific tutor fitness
2010
Animals can acquire behaviours from others, including heterospecifics, but should be discriminating in when and whom to copy. Successful individuals should be preferred as tutors, while adopting traits of poorly performing individuals should be actively avoided. Thus far it is unknown if such adaptive strategies are involved when individuals copy other species. Furthermore, rejection of traits based on tutor characteristics (negative bias) has not been shown in any non-human animal. Here we test whether a choice between two new, neutral behavioural alternatives—breeding-sites with alternative geometric symbols—is affected by observing the choice and fitness of a heterospecific tutor. A fiel…
Baltic Journal of Psychology; Volume 15, Number 1-2
2014
A multi-parametric evolution strategies algorithm for vehicle routing problems
2007
Vehicle routing problems are at the heart of most decision support systems for real-life distribution problems. In vehicle routing problem a set of routes must be determined at lowest total cost for a number of resources (i.e. fleet of vehicles) located at one or several points (e.g. depots, warehouses) in order to efficiently service a number of demand or supply points. In this paper an efficient evolution strategies algorithm is developed for both capacitated vehicle routing problem and for vehicle routing problem with time window constraints. The algorithm is based on a new multi-parametric mutation procedure that is applied within the 1 + 1 evolution strategies algorithm. Computational …
Average flow constraints and stabilizability in uncertain production-distribution systems
2009
We consider a multi-inventory system with controlled flows and uncertain demands (disturbances) bounded within assigned compact sets. The system is modelled as a first-order one integrating the discrepancy between controlled flows and demands at different sites/nodes. Thus, the buffer levels at the nodes represent the system state. Given a long-term average demand, we are interested in a control strategy that satisfies just one of two requirements: (i) meeting any possible demand at each time (worst case stability) or (ii) achieving a predefined flow in the average (average flow constraints). Necessary and sufficient conditions for the achievement of both goals have been proposed by the aut…
Parenting Stress in Mothers of Children With Autism Without Intellectual Disability. Mediation of Behavioral Problems and Coping Strategies
2019
The present study investigated the mediating role of behavioral difficulties, coping strategies, and social functional support in the relationship between symptoms severity and parenting stress in mothers of children with ASD (autism spectrum disorder). The parenting stress questionnaire, coping orientation to problems experienced scale, strengths and difficulties questionnaire, and Duke-UNC social support questionnaire were administered to 52 mothers, who also estimated the ASD severity symptoms of their children. Correlation analyses revealed that parenting stress was positively correlated with the children's ASD symptoms and behavioral problems. On the other hand, parenting stress was ne…
Morphological analysis of phytoplankton as a tool to assess ecological state of aquatic ecosystems: the case of Lake Arancio, Sicily, Italy
2013
Phytoplankton requires a sufficient supply of light and nutrients to grow. At the same time it is largely entrained in water motion and is subject to grazing from planktonic herbivores. The pelagic life of lake phytoplankton is based on 4 pillars: living in suspension, light harvesting, nutrient uptake, and escape from grazing. Environmental variability and the uneven distribution of resources among and within the different aquatic ecosystems exert a selective pressure on these organisms, which are formed by a single cell or by colonies with either relatively low or high numbers of cells. Phytoplankton displays an amazing morphological variability representing an adaptation to spatial and t…
Herramientas para la mejora de las organizaciones educativas y su relación con el entorno.
2021
Mejorar la vinculación de las organizaciones educativas con el entorno supone un aspecto sumamente importante para el desarrollo socioeducativo de las comunidades en las que éstas se insertan. De hecho, impulsar y potenciar la relación entre las organizaciones educativas y el entorno es, en cierto modo, un ejercicio de responsabilidad que debe concretarse a través de actuaciones y herramientas favorecedoras del desarrollo de organizaciones capaces de aprender y promover la participación activa del entorno para conseguir sus metas. Esta aportación aborda propuestas como el trabajo en red, los planes educativos de entorno, la colaboración entre escuelas, municipio y familias, la planificación…
Estudio exploratorio de las estrategias de encuadre discursivo en memes humorísticos publicados en Twitter durante las elecciones generales de noviem…
2020
La presente investigación se basa en el análisis de un corpus de 115 memes humorísticos difundidos en la red social Twitter, durante las elecciones generales celebradas en España en noviembre de 2019. Para su recopilación se han consultado los tuits publicados haciendo uso de los hashtags que se convirtieron en trending topic, en el transcurso de la campaña electoral que tuvo lugar entre el 1 y el 10 de noviembre de 2019. En ellos hemos podido identificar los principales rasgos que caracterizan al discurso pseudopolítico y determinadas estrategias de encuadre discursivo utilizadas para movilizar el voto y orientar cognitivamente los mensajes. This research is based on the analysis of a corp…
The economic crisis in an industrial district and its effects on the migration flows
2013
El modelo económico de la provincia de Castellón, basado en la industria cerámica (más del 90% de la producción española) y la construcción, junto con las actividades relacionadas con el turismo, la agricultura intensiva de regadío y el servicio doméstico, generó una oferta de empleo impresionante que, entre 2000 y 2007, atrajo a miles de inmigrantes, la mayoría procedentes de Rumania. La actual crisis económica ha tenido efectos devastadores en esta provincia, donde la destrucción de puestos de trabajo ha sido mucho más intensa que en el conjunto estatal, al tiempo que el paro registra niveles más altos, sobre todo entre la población extranjera. El objetivo de este trabajo es analizar el i…
Pluriannual morphological variability in a highly productive Mediterranean reservoir (Lake Arancio, southwestern Sicily)
2007
The progressive decrease in water quality experienced by the Mediterranean, nutrient rich reservoir, Lake Arancio (Southwestern Sicily, Italy), has been accompanied by modifications in both phytoplankton shape and size. Since nutrient concentrations are always far from being limiting, in the present paper attention was focussed on the effects exerted by physical constraints (e.g., mixing, light availability) on the morphological variation observed in phytoplankton. The surface-volume ratio and its product with the maximal linear dimension were chosen as morphological descriptors to trace the trajectories followed by the dominant morphotypes in Lake Arancio. One of these descriptors was comp…