Search results for "resources"
showing 10 items of 1614 documents
A simulation/optimization model for selecting infrastructure alternatives in complex water resource systems
2010
The paper introduces a simulation/optimization procedure for the assessment and the selection of infrastructure alternatives in a complex water resources system, i.e. in a multisource (reservoirs) multipurpose bulk water supply scheme. An infrastucture alternative is here a vector X of n decision variables describing the candidate expansions/new plants/water transfers etc. Each parameter may take on a discrete number of values, with its own investment cost attached. The procedure uses genetic algorithms for the search of the optimal vector X through operators mimicking the mechanisms of natural selection. For each X, the value of the objective function (O.F.) is assessed via a simulation mo…
Applying the approximation method PAINT and the interactive method NIMBUS to the multiobjective optimization of operating a wastewater treatment plant
2014
Using an interactive multiobjective optimization method called NIMBUS and an approximation method called PAINT, preferable solutions to a five-objective problem of operating a wastewater treatment plant are found. The decision maker giving preference information is an expert in wastewater treatment plant design at the engineering company Pöyry Finland Ltd. The wastewater treatment problem is computationally expensive and requires running a simulator to evaluate the values of the objective functions. This often leads to problems with interactive methods as the decision maker may get frustrated while waiting for new solutions to be computed. Thus, a newly developed PAINT method is used to spe…
A NEW REPRESENTATION OF ENERGY STORAGE SYSTEMS OPERATION USING FOURIER THEORY IN OPTIMAL SMART GRIDS MANAGEMENT
2012
This paper investigates the possibility to use a new modeling of Energy Storage Systems based on zero integral functions. Such functions represent the course of the energy level stored in batteries during the solution of optimal management problems in smart-grids. Storage devices, such as all the other components that are required to meet an integral capacity constraint along the dispatch time, must show the same State of Charge at the start and at the end of the timeframe considered for operation. In this paper, a set of sinusoidal functions have been used for the synthesis of the charge and discharge course of energy Storage Systems. Such representation allows to eliminate the difficult c…
GRASP and path relinking for project scheduling under partially renewable resources
2008
[EN] Recently, in the field of project scheduling problems the concept of partially renewable resources has been introduced. Theoretically, it is a generalization of both renewable and non-renewable resources. From an applied point of view, partially renewable resources allow us to model a large variety of situations that do not fit into classical models, but can be found in real problems in timetabling and labor scheduling. In this paper, we develop some preprocessing techniques and several heuristic algorithms for the problem. Preprocessing significantly reduces the dimension of the problems, therefore improving the efficiency of solution procedures. Heuristic algorithms based on GRASP an…
La influencia del género en el aprendizaje matemático en España. Evidencias desde PISA
2020
espanolDiferentes estudios muestran como el factor genero es una variable que incide en el rendimiento matematico. El presente articulo indaga sobre la existencia y evolucion de una brecha de genero en el aprendizaje de las matematicas en Espana, con base a los resultados de la evaluacion del Programa Internacional para la Evaluacion de Estudiantes (PISA) en todas sus ediciones. Se valora tambien la competencia matematica de los alumnos espanoles, sin diferencia de genero. Se ha realizado una revision bibliografica de los ultimos 30 anos y un analisis multisectorial de los datos suministrados por los informes PISA. En el historico los resultados destacan un mejor desempeno por competencias …
Improving the representational strategies of children in a music-listening and playing task: An intervention-based study
2015
This intervention-based study focuses on the relation between music and its graphic representation from a meta-representational point of view. It aims to determine whether middle school students show an increase in meta-representational competence (MRC) after an educational intervention. Three classes of 11 to 14-year-old students participated in the teaching experiment: one experimental class (E) and two control classes (C). An intervention on MRC was carried out on the E class during the hours that were allocated for the regular music lessons, while students from the C classes followed the regular music curriculum. E and C classes were given the same pretest and posttest, which measured …
Problem solving: competence for the enhancement of talents. A research with future primary school and kindergarten support teachers
2021
Education to achieve individual talent must become a priority in the educational process in order to contribute to the construction of a sustainable society. Training teachers to promote talent in students means guaranteeing each person the educational success and the achievement of their maximum potential. If problem solving becomes a tool for the enhancement of talent in the classroom, training in this competence becomes essential. In the educational field, talent and excellence are based on a unique attitude or an accentuated interest that a person possesses. The topic of the ability to solve educational problems by those who are going to carry out the profession of teacher implies the a…
GWideCodeML: A python package for testing evolutionary hypotheses at the genome-wide level
2020
One of the most widely used programs for detecting positive selection, at the molecular level, is the program codeml, which is implemented in the Phylogenetic Analysis by Maximum Likelihood (PAML) package. However, it has a limitation when it comes to genome-wide studies, as it runs on a gene-by-gene basis. Furthermore, the size of such studies will depend on the number of orthologous genes the genomes have income and these are often restricted to only account for instances where a one-to-one relationship is observed between the genomes. In this work, we present GWideCodeML, a Python package, which runs a genome-wide codeml with the option of parallelization. To maximize the number of analy…
Startup Metrics That Tech Entrepreneurs Need to Know
2020
Metrics can be used by firms to make more objective decisions based on data. Software startups in particular are characterized by the uncertain or even chaotic nature of the contexts in which they operate. Using data in the form of metrics can help software startups to make the right decisions amid uncertainty and limited resources. However, whereas conventional business metrics and software metrics have been studied in the past, metrics in the specific context of software startups have not been studied. In this chapter, we present the results of a multivocal literature review to offer you 118 metrics practitioner experts think software startups should measure. These metrics can give you id…
How high-commitment HRM relates to PC violation and outcomes: The mediating role of supervisor support and PC fulfilment at individual and organizati…
2020
Abstract Psychological contract (PC) constitutes a theoretical framework for; explaining labor relationships, and it has been considered as a; mediation step between structural variables and processes and work and; organizational outcomes. Whereas PC (un)fulfillment; showed consistent relationships with variables such as job satisfaction, organizational commitment, performance, or absenteeism, the effects of PC; violation (emotional answers that develop after perceptions of PC; breach) have been less investigated. In addition, structural antecedents; of PC constructs had included Human Resources (HR) practices. This paper aims to extend; research on PC and its role as a mediator between HR …