Flocking motion in swarms with limited sensing radius and heterogeneous input constraints     

Eber Jafet Ávila-Martínez  Juan Gonzalo Barajas-Ramírez 《Journal of The Franklin Institute》2021,358(4):2346-2366

This paper addresses the flocking motion problem for swarms of agents with two restrictions: limited communication/detection ranges and different input constraints. In this problem, the distance between pairs of agents determines if a communication/detection link exists among them, while each agent has a different control action bound. We use the notion of proximity graph to model communication/detection between agents and provide distributed controllers designed for leaderless and leader-followers flocking motion scenarios. Our proposed designs preserve the connectivity of the proximity graph while the control effort satisfies the bound of each particular agent. Unlike previous results, our protocols take advantage of the group’s input heterogeneity to use agents with a greater capacity to compensate for neighbors that are less capable of meeting the group’s requirements. Additionally, our designs are based only on local state errors and are robust to non-modeled edge failures. To illustrate the effectiveness of our proposal, we use numerical simulations of different flocking scenarios.  相似文献   

Development and initial validation of the Psychological Characteristics of Developing Excellence Questionnaire     

Macnamara Á  Collins D 《Journal of sports sciences》2011,29(12):1273-1286

The development of talent is a complex process mediated by a host of psychological, social, physical, and environmental variables. Unfortunately, the multiple processes involved in talent development are frequently ignored by the systems and protocols employed in sport. Modern approaches to talent development are beginning to stress the initial possession, then subsequent development, of generic psychological characteristics (e.g. psychological characteristics of developing excellence; MacNamara, Button, & Collins, 2010a , 2010b ) as the best way to realize latent potential. Accordingly, this paper describes the development and initial validation of the Psychological Characteristics of Developing Excellence Questionnaire (PCDEQ). In the first phase, an initial list of 160 items was developed. A combination of expert panel reviews, cognitive interviews, and a pilot test was used to assess the relevance, representativeness, and validity of each item. Ninety-six items were retained following these steps. Exploratory factor analysis, with a sample of 363 athletes, revealed an interpretable 59-item, 6-factor solution with good internal consistency (0.870, 0.866, 0.847, 0.741, 0.749, and 0.701 respectively). The Psychological Characteristics of Developing Excellence Questionnaire would appear to hold promise as a useful tool to provide coaches and athletes with information about the psychological characteristics of developing excellence that are being properly addressed or neglected during different stages of development or in different contexts.  相似文献   

Implementation of the flipped classroom and its longitudinal impact on improving academic performance     

Torres-Martín  César  Acal  Christian  El-Homrani  Mohammed  Mingorance-Estrada  Ángel C. 《Educational technology research and development : ETR & D》2022,70(3):909-929

Educational technology research and development - The objective has been to know the impact of the flipped classroom methodology on the academic performance of students during their training...  相似文献   

A qualitative study of the impact of electronic journals on scholarly information behavior     

Candela Ollé  Ángel Borrego 《Library & information science research》2010

A qualitative study of the impact of electronic journals on the information behavior of academic researchers at Catalan universities shows that academic researchers now read more, and more widely. However, their reading is becoming more superficial; they are compelled to improve their discrimination skills in order to decide what to read in more depth. The electronic accessibility of journals means that researchers now make fewer library visits. Web browsing and table of contents (TOC) e-mail alerts are replacing physical browsing, and searching is a very popular option for keeping up to date with developments. Internet search engines, especially Google and Google Scholar, are becoming important sources of information for researchers. However, they face problems in managing their personal scientific information.  相似文献   

Media Accountability and Journalists: To Whom Do Spanish Professionals Feel Responsible?     

María-Ángeles Chaparro-Domínguez  Juan-Carlos Suárez-Villegas  Ruth Rodríguez-Martínez 《Journalism Practice》2020,14(7):812-829

ABSTRACT

This paper analyses to whom Spanish journalists feel responsible. To achieve this objective, we sent out a survey to Spanish journalists to ascertain their opinion on this question. The journalists’ point of view was then compared with that of the general public though six focus groups consisting of Spanish citizens from six cities in Spain (Barcelona, Castellón, Madrid, Sevilla, Mondragón and Santiago de Compostela). Lastly, five in-depth interviews were conducted with journalism experts (e.g., directors of professional journalist associations). The main results show that the journalists feel particularly responsible to their conscience, the journalism code of ethics and their sources. The citizens, in contrast, believe that journalists should be responsible to the audience. We contextualised the Spanish finding in the European context by comparing our results with those derived from a study among European journalists.  相似文献   

Blind spot detection using vision for automotive applications     

José BARRIGA 《浙江大学学报(A卷英文版)》2008,9(10):1369-1372

This paper describes a vision-based system for blind spot detection （BSD） in intelligent vehicle applications. A camera is mounted in the lateral mirror of a car with the intention of visually detecting cars that are located in the so-called blind spot and cannot be perceived by the vehicle driver. The detection of cars in the blind spot is carried out using computer vision techniques, based on optical flow and a double-stage data clustering technique for robust vehicle detection.  相似文献   

Guest Editorial     

Keith Jones  Ángel Gutiérrez  Maria Alessandra Mariotti 《Educational Studies in Mathematics》2000,44(1-3):1-3

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Integrated assessment on mathematics 12–16     

Josep M. Fortuny  Joaquim Giménez  Claudi Alsina 《Educational Studies in Mathematics》1994,27(4):401-412

In this paper we give an account of an integrated package of assessment, describing its conceptual posing as well as its formats, functions, use and effects. The package introduces a diversity of materials searching for connecting and integrating different contributions in a multidimensional scheme.  相似文献   

Going to action? A literature review on educational proposals in formal Environmental Education     

Mercedes Varela-Losada  Pedro Vega-Marcote  Uxío Pérez-Rodríguez  María Álvarez-Lires 《Environmental Education Research》2016,22(3):390-421

The current state of the planet’s environmental deterioration calls for formal educational contexts to implement effective environmental proposals which nurture action competence. The aim of this paper is to examine the educational proposals in formal contexts that have been published in the two research journals of greatest impact on Environmental Education during the period 2008–2013, and to analyse how they contribute to the development of action competence. Special attention is paid to research (i) based on real participation by students; (ii) promotes reflection on the complexity of environmental issues; (iii) facilitates critical thinking; (iv) encourages autonomous and responsible decision-making and (v) involves communities. Our results show that these approaches can help improve the development of action-focused environmental education and bring to light a series of challenges for future research.  相似文献   

Spain: The decision-making process in educational reform     

Álvaro Marchesi 《Prospects》1997,27(4):549-558

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