What was out of the frame? A dialogic look at youth media production in a cultural diversity and educational context in Chile     

Andrea Valdivia 《Learning, Media and Technology》2017,42(1):112-125

This article accounts for an experience of digital storytelling workshops with indigenous adolescents in Chile, and proposes a theoretical and methodological approach to analyze digital creations with a dialogic and ethnographic point of view. Based on this, it discusses the possibilities of digital media production as a strategy for the self-expression of children and adolescents, particularly immersed in unequal and ethnically diverse educational contexts. The specific case of two Mapuche girls reveals complex ways of organizing and positioning their voices, where ‘girl power’ and ‘post-girl power’ discourses are relevant, but not so their ethnicity. The results show that television, with its main audiovisual genres, styles and stereotypes, appears clearly on the teenagers’ creations, while the absence of Mapuche signs along the creation process and also into the digital stories seems to be related with two important features of the Chilean educational system: ethnic inequalities and its fierce attachment to neoliberalism.  相似文献   

University–industry interactions in applied research: The case of microelectronics     

Margherita Balconi  Andrea Laboranti 《Research Policy》2006,35(10):1616-1630

In the first part of the paper we discuss the pattern of research in microelectronics, illustrating the reasons why, in order to achieve distinguished scientific performance, universities need to collaborate with industry, and in particular academic researchers need to interact with industrial ones by face-to-face knowledge exchanges. In the second part, using patent data integrated with information collected through interviews, we measure the extent and intensity of the ties of academic with industrial researchers, and apply social network analysis to reconstruct the network of collaborations. The picture that emerges (from this Italian case) is fully consistent with the specific research pattern. Collaboration is based on teams of researchers from the two spheres, and strong connections are associated with high scientific performance. Moreover, border-crossing collaborations tend to be driven by cognitive proximity and personal relationships.  相似文献   

感光度详解     

Andrea Thompson 《科技新时代》2005,(11):96-99

与光圈和快门一样，感光度也是曝光控制系统的一个重要方面。因此，我们将在这里对它作一次全面，深入的讲解。  相似文献   

Children's disclosures of sexual abuse: learning from direct inquiry     

Schaeffer P  Leventhal JM  Asnes AG 《Child abuse & neglect》2011,35(5):343-352

Objectives

Published protocols for forensic interviewing for child sexual abuse do not include specific questions about what prompted children to tell about sexual abuse or what made them wait to tell. We, therefore, aimed to: (1) add direct inquiry about the process of a child's disclosure to a forensic interview protocol; (2) determine if children will, in fact, discuss the process that led them to tell about sexual abuse; and (3) describe the factors that children identify as either having led them to tell about sexual abuse or caused them to delay a disclosure.

Methods

Forensic interviewers were asked to incorporate questions about telling into an existing forensic interview protocol. Over a 1-year period, 191 consecutive forensic interviews of child sexual abuse victims aged 3-18 years old in which children spoke about the reasons they told about abuse or waited to tell about abuse were reviewed. Interview content related to the children's reasons for telling or for waiting to tell about abuse was extracted and analyzed using a qualitative methodology in order to capture themes directly from the children's words.

Results

Forensic interviewers asked children about how they came to tell about sexual abuse and if children waited to tell about abuse, and the children gave specific answers to these questions. The reasons children identified for why they chose to tell were classified into three domains: (1) disclosure as a result of internal stimuli (e.g., the child had nightmares), (2) disclosure facilitated by outside influences (e.g., the child was questioned), and (3) disclosure due to direct evidence of abuse (e.g., the child's abuse was witnessed). The barriers to disclosure identified by the children were categorized into five groups: (1) threats made by the perpetrator (e.g., the child was told (s)he would get in trouble if (s)he told), (2) fears (e.g., the child was afraid something bad would happen if (s)he told), (3) lack of opportunity (e.g., the child felt the opportunity to disclose never presented), (4) lack of understanding (e.g., the child failed to recognize abusive behavior as unacceptable), and (5) relationship with the perpetrator (e.g., the child thought the perpetrator was a friend).

Conclusions

Specific reasons that individual children identify for why they told and why they waited to tell about sexual abuse can be obtained by direct inquiry during forensic interviews for suspected child sexual abuse.

Practice implications

When asked, children identified the first person they told and offered varied and specific reasons for why they told and why they waited to tell about sexual abuse. Understanding why children disclose their abuse and why they wait to disclose will assist both professionals and families. Investigators and those who care for sexually abused children will gain insight into the specific barrier that the sexually abused child overcame to disclose. Prosecutors will be able to use this information to explain to juries why the child may have delayed his or her disclosure. Parents who struggle to understand why their child disclosed to someone else or waited to disclose will have a better understanding of their child's decisions.  相似文献   

The balance of knowledge flows     

Giovanni Abramo  Ciriaco Andrea D’Angelo  Massimiliano Carloni 《Journal of Informetrics》2019,13(1):1-9

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On the Shapley value and its application to the Italian VQR research assessment exercise     

Camil Demetrescu  Francesco Lupia  Angelo Mendicelli  Andrea Ribichini  Francesco Scarcello  Marco Schaerf 《Journal of Informetrics》2019,13(1):87-104

Research assessment exercises have now become common evaluation tools in a number of countries. These exercises have the goal of guiding merit-based public funds allocation, stimulating improvement of research productivity through competition and assessing the impact of adopted research support policies. One case in point is Italy's most recent research assessment effort, VQR 2011–2014 (Research Quality Evaluation), which, in addition to research institutions, also evaluated university departments, and individuals in some cases (i.e., recently hired research staff and members of PhD committees). However, the way an institution's score was divided, according to VQR rules, between its constituent departments or its staff members does not enjoy many desirable properties well known from coalitional game theory (e.g., budget balance, fairness, marginality). We propose, instead, an alternative score division rule that is based on the notion of Shapley value, a well known solution concept in coalitional game theory, which enjoys the desirable properties mentioned above. For a significant test case (namely, Sapienza University of Rome, the largest university in Italy), we present a detailed comparison of the scores obtained, for substructures and individuals, by applying the official VQR rules, with those resulting from Shapley value computations. We show that there are significant differences in the resulting scores, making room for improvements in the allocation rules used in research assessment exercises.  相似文献   

Authorship analysis of specialized vs diversified research output     

Giovanni Abramo  Ciriaco Andrea D’Angelo  Flavia Di Costa 《Journal of Informetrics》2019,13(2):564-573

The present work investigates the relations between amplitude and type of collaboration (intramural, extramural domestic or international) and output of specialized versus diversified research. By specialized or diversified research, we mean within or beyond the author’s dominant research topic. The field of observation is the scientific production over five years from about 23,500 academics. The analyses are conducted at the aggregate and disciplinary level. The results lead to the conclusion that in general, the output of diversified research is no more frequently the fruit of collaboration than is specialized research. At the level of the particular collaboration types, international collaborations weakly underlie the specialized kind of research output; on the contrary, extramural domestic and intramural collaborations are weakly associated with diversified research. While the weakness of association remains, exceptions are observed at the level of the individual disciplines.  相似文献   

Anatomical Sciences Education Vol. 4, Issue 3, 2011 Cover Image     

Veronica Macchi  Andrea Porzionato  Carla Stecco  Cesare Tiengo  Anna Parenti  Adriano Cestrone  Raffaele De Caro 《Anatomical sciences education》2011,4(3)

Medical Gross Anatomy lecture at the University of Padova, Italy. Gross Anatomy at the University of Padova is taught utilizing both traditional and technological resources, which are integrated with practical laboratory exercises (mainly on plastic models and plastinated specimens) as well as radiological anatomy. In this issue of ASE, Dr. Veronica Macchi and her colleagues from the Department of Human Anatomy and Physiology at the University of Padova discuss an innovative pilot project with their University Hospital in which they obtain body parts removed from patients during surgical procedures and utilize them for gross anatomy education. The cover photograph shows one of the co‐authors of this paper, Professor Raffaele De Caro and his students, performing dissection of the distal forearm and hand in the anatomy lecture theater at the University of Padova.  相似文献   

Novel model reference adaptive control laws for improved transient dynamics and guaranteed saturation constraints     

Robert B. Anderson  Julius A. Marshall  Andrea L’Afflitto 《Journal of The Franklin Institute》2021,358(12):6281-6308

In classical model reference adaptive control (MRAC), the adaptive rates must be tuned to meet multiple competing objectives. Large adaptive rates guarantee rapid convergence of the trajectory tracking error to zero. However, large adaptive rates may also induce saturation of the actuators and excessive overshoots of the closed-loop system’s trajectory tracking error. Conversely, low adaptive rates may produce unsatisfactory trajectory tracking performances. To overcome these limitations, in the classical MRAC framework, the adaptive rates must be tuned through an iterative process. Alternative approaches require to modify the plant’s reference model or the reference command input. This paper presents the first MRAC laws for nonlinear dynamical systems affected by matched and parametric uncertainties that constrain both the closed-loop system’s trajectory tracking error and the control input at all times within user-defined bounds, and enforce a user-defined rate of convergence on the trajectory tracking error. By applying the proposed MRAC laws, the adaptive rates can be set arbitrarily large and both the plant’s reference model and the reference command input can be chosen arbitrarily. The user-defined rate of convergence of the closed-loop plant’s trajectory is enforced by introducing a user-defined auxiliary reference model, which converges to the trajectory tracking error obtained by applying the classical MRAC laws before its transient dynamics has decayed, and steering the trajectory tracking error to the auxiliary reference model at a rate of convergence that is higher than the rate of convergence of the plant’s reference model. The ability of the proposed MRAC laws to prescribe the performance of the closed-loop system’s trajectory tracking error and control input is guaranteed by barrier Lyapunov functions. Numerical simulations illustrate both the applicability of our theoretical results and their effectiveness compared to other techniques such as prescribed performance control, which allows to constrain both the rate of convergence and the maximum overshoot on the trajectory tracking error of uncertain systems.  相似文献   

Multi-physics modelling and sensitivity analysis of olympic rowing boat dynamics     

Andrea Mola  Mehdi Ghommem  Muhammad Hajj 《Sports Engineering》2011,14(2-4):85-94

A multidisciplinary approach is implemented to model and analyse the performance of Olympic rowing boats. A reduced-order model that couples rowers motions with the hull, oars and hydrodynamic and hydrostatic forces is detailed. This model is complemented with a sensitivity analysis carried out by means of a non-intrusive polynomial chaos expansion. Sensitivity analysis results for two different boat classes, namely, a lightweight single scull and a coxless four are presented and discussed. This analysis contrasts, for both classes, the effects of varying forces exerted by the rowers, weights of rowers and cadence of motions on the boat performance.  相似文献