Search results for "Perspective"
showing 10 items of 1523 documents
DEA-like Models for the Efficiency Evaluation of Hierarchically Structured Units
2004
Abstract The knowledge of the internal structure of decision making units (DMUs) gives further insights with respect to the “black box” perspective when considering data envelopment analysis models. We present one-level and two-level hierarchical structures of the DMUs under evaluation. Each unit is composed of consecutive stages of parallel subunits all with constant returns to scale. In particular, the maximization of the relative efficiency of a DMU is studied. For the two-stage situation, different degrees of coordination among the subunits of the hierarchical levels are discussed. When some form of coordination has to be guaranteed, we introduce balancing constraints and we compare two…
Least-Norm Regularization For Weak Two-Level Optimization Problems
1992
In this paper, we consider a regularization for weak two-level optimization problems by adaptation of the method presented by Solohovic (1970). Existence and approximation results are given in the case in which the constraints to the lower level problems are described by a multifunction. Convergence results for the least-norm regularization under perturbations are also presented.
Mathematical Modelling Problems in a Mathematics Course for Engineers: A Commognitive Perspective
2021
Mathematical knowledge is very important for engineers; both quantitative and qualitative analysis of physical systems and manufacturing processes require solid scientific principles and appropriate mathematical tools. Teaching of mathematical modelling at the university contributes to the development of mathematical competencies, motivates the interest to mathematics and plays a significant didactical role in promoting advanced mathematical thinking. These views are supported by the analysis of students’ work on a mathematical modelling assignment in a university mathematics course for future engineers with the help of the commognitive framework. Students’ narratives in written solutions a…
The Materialisation of Children’s Mathematical Thinking Through Organisation of Turn-Taking in Small Group Interactions in Kindergarten
2020
This chapter reports from a case study which focuses on the coordination of turn-taking within two small groups of kindergarten children (age 5–6) working on addition problems. The two segments of small group interaction were analysed from a multimodal, interpretative perspective. Drawing on Radford’s (J Res Math Educ, 2:7–44, 2013) theory of knowledge objectification, the study explores the characteristics of children’s turn-taking and what role children’s organisation of turn-taking plays in the movement of the joint activity, and thus for the materialisation of their mathematical thinking. The findings suggest that children’s various ways of organising turn-taking give rise to different …
Destination image
2002
Abstract This paper presents a review and discussion of the concept and measurement of destination image, within an intradisciplinary marketing perspective. Both theoretical and methodological aspects of this concept and measurement are treated. Based on the existence of three dimensions of object, subject and attributes, previous studies are analyzed. A taxonomy of the methodological and statistical procedures for measuring the image of the destinations is also proposed in order to help researchers to capture and measure the image construct. The paper proposes a conceptual model featuring its complex, multiple, relativistic and dynamic nature as a more comprehensive framework of destinatio…
Ranking of Brain Tumour Classifiers Using a Bayesian Approach
2009
This study presents a ranking for classifers using a Bayesian perspective. This ranking framework is able to evaluate the performance of the models to be compared when they are inferred from different sets of data. It also takes into account the performance obtained on samples not used during the training of the classifiers. Besides, this ranking assigns a prior to each model based on a measure of similarity of the training data to a test case. An evaluation consisting of ranking brain tumour classifiers is presented. These multilayer perceptron classifiers are trained with 1H magnetic resonance spectroscopy (MRS) signals following a multiproject multicenter evaluation approach. We demonstr…
The Influence of Business Ecosystems on Innovation-Based Industries: A Research on the Mechanical Sector in Italy
2018
The business ecosystem perspective can be considered as a more advanced point of view for interpreting the development of local economic systems, if compared to more traditional concepts such as clusters, industrial districts, local or regional systems, and local networks. The business ecosystem perspective allows to better highlight the adaptive and evolutionary nature of local systems in front of the changing external environment and dynamics on national and international markets. The aim of the research was to analyze the key characteristics of firms belonging to a local business ecosystem specialized on an innovation-driven industry – the mechanical sector – in order to verify which kin…
Journalistic Passion as Commodity: A Managerial Perspective
2021
This article focuses on the role of passion in news journalism from a managerial perspective. The analysis is based on a data set of 40,621 web-based job advertisements obtained from Journalismjobs.com, from the year 2002 to 2017. The quantitative analysis shows that passion has been on the rise as only 4% of the job advertisements in 2002 asked for “passionate” journalists, increasing to almost 16% in 2013. The authors also performed a qualitative analysis of job advertisements mentioning the word “passion” for the periods 2002–2003 and 2017. These advertisements express a shift from a normative role of journalists to journalism as an activity: when mentioned …
Funcionamiento familiar, autoestima y consumo de sustancias en adolescentes: un modelo de mediación
2007
Objective This research analyzes the direct and indirect relationships among family functioning, multidimensional self-esteem (family, academic, social, and physical self-esteem) and substance use. Materials and methods The study participants were composed of two independent samples of Spanish adolescents who provided information during the 2003-2004 academic year (n1 = 414, Castilla and Leon; n2 = 625, Comunidad Valenciana). The statistical analyses were carried out using structural equation modelling and the procedure of mediation effects analysis (Holmbeck, 1997). Results Results showed a significant mediational effect of self-esteem on the relation between family functioning and adolesc…
A compensatory model to understand dysfunctional personality traits in problematic gaming: The role of vulnerable narcissism
2020
Abstract According to a “compensatory perspective”, this study aimed to examine the role of narcissism (both vulnerable and grandiose) in the relationship between emotion dysregulation, escapism motivation to play, and problematic gaming. In a sample of 405 World of Warcraft players, we tested a multiple mediation model in which the relationship between vulnerable/grandiose narcissism and problematic gaming was mediated by emotion dysregulation and escapism. Results showed that the model for vulnerable (but not grandiose) narcissism fitted the data very well. This study adds novel insight to our understanding of the mechanisms that support problematic gaming, suggesting that the emotion dys…