Evaluating virtual reality and augmented reality training for industrial maintenance and assembly tasks     

Nirit Gavish  Teresa Gutiérrez  Sabine Webel  Jorge Rodríguez  Matteo Peveri  Uli Bockholt 《Interactive Learning Environments》2013,21(6):778-798

The current study evaluated the use of virtual reality (VR) and augmented reality (AR) platforms, developed within the scope of the SKILLS Integrated Project, for industrial maintenance and assembly (IMA) tasks training. VR and AR systems are now widely regarded as promising training platforms for complex and highly demanding IMA tasks. However, there is a need to empirically evaluate their efficiency and effectiveness compared to traditional training methods. Forty expert technicians were randomly assigned to four training groups in an electronic actuator assembly task: VR (training with the VR platform twice), Control-VR (watching a filmed demonstration twice), AR (training with the AR platform once), and Control-AR (training with the real actuator and the aid of a filmed demonstration once). A post-training test evaluated performance in the real task. Results demonstrate that, in general, the VR and AR training groups required longer training time compared to the Control-VR and Control-AR groups, respectively. There were fewer unsolved errors in the AR group compared to the Control-AR group, and no significant differences in final performance between the VR and Control-VR groups, probably due to a ceiling effect created by the use of two training trials in the selected task for participants who were expert technicians. The results suggest that use of the AR platform for training IMA tasks should be encouraged and use of the VR platform for that purpose should be further evaluated.  相似文献   

Unpacking science for all through the lens of identities-in-practice: the stories of Amelia and Ginny   总被引：1，自引：0，他引：1  

Edna Tan  Angela Calabrese Barton 《Cultural Studies of Science Education》2008,3(1):43-71

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Framing equity through a closer examination of critical science agency     

Schenkel  Kathleen  Calabrese Barton  Angela  Tan  Edna  Nazar  Christina Restrepo  Flores  Marcos D. González D. 《Cultural Studies of Science Education》2019,14(2):309-325

Cultural Studies of Science Education - Science for all has been touted as the primary path to equity in science education in the USA. We argue that without attention to the power imbalances that...  相似文献   

Enhancing rice resistance to fungal pathogens by transformation with cell wall degrading enzyme genes from Trichoderma atroviride     

刘梅  孙宗修  朱洁  徐同  HARMAN Gary E  LORITO Matteo 《浙江大学学报(A卷英文版)》2004,5(2)

Three genes encoding for fungal cell wall degrading enzymes (CWDEs), ech42, nag70 and gluc78 from the biocontrol fungus Trichoderma atroviride were inserted into the binary vector pCAMBIA1305.2 singly and in all possible combinations and transformed to rice plants. More than 1800 independently regenerated plantlets in seven different populations (for each of the three genes and each of the four gene combinations) were obtained. The ech42 gene encoding for an endochitinase increased resistance to sheath blight caused by Rhizoctonia solani, while the exochitinase-encoding gene, nag70, had lesser effect. The expression level of endochitinase but exochitinase was correlated with disease resistance. Nevertheless, exochitinase enhanced the effect of endochitinase on disease resistance when the two genes co-expressed in transgenics. Resistance to Magnaporthe grisea was found in all kinds of regenerated plants including that with single gluc78. A few lines expressing either ech42 or nag70 gene were immune to the disease. Transgenic plants are being tested to further evaluate disease resistance at field level. This is the first report of multiple of expression of genes encoding CWDEs from Trichoderma atroviride that result in resistance to blast and sheath blight in rice.  相似文献   

Underprivileged urban mothers' perspectives on science     

Angela Calabrese Barton  Toby J. Hindin  Isobel R. Contento  Michelle Trudeau  Kimberley Yang  Sumi Hagiwara  Pamela D. Koch 《科学教学研究杂志》2001,38(6):688-711

The purpose of this article is to report our findings from a qualitative study intended to develop our understandings of how inner‐city mothers perceive science. Using qualitative methodologies, our analysis reveals that the mothers' perceptions can be grouped into four categories: perceptions of science as (a) schoolwork/knowledge, (b) fun projects, (c) a tool for maintaining the home and family, and (d) an untouchable domain. After we present these categories we compare our findings across categories to argue that those mothers who had spent time doing science with their children were more likely to have a more personal, dynamic, and inquiry‐based view of science. We also argue that mothers' perceptions of science were more dynamic when they spoke about situations and contexts that were familiar to them, such as food, nutrition, and child care. We conclude the article with a discussion of the implications our findings have for science education reform. © 2001 John Wiley & Sons, Inc. J Res Sci Teach 38: 688–711, 2001  相似文献   

The difficult transition of the Italian university system: growth,underfunding and reforms     

Matteo Turri 《Journal of Further & Higher Education》2016,40(1):83-106

The evolution of Italian universities in terms of growth, economic sustainability and reforms can be interpreted in the light of the élite, mass and universal access categories defined by Martin Trow. The findings from this analysis show that although the number of enrolled students and funding problems propel the Italian university system towards the universal access stage, activities and functioning mechanisms are lagging far behind, since they are still involved in the transition from the élite to mass stage. Interpretation of the changes since 1980 on the basis of the New Public Management (NPM) paradigm and the notion of diversity allows identification of the reasons for this discrepancy as being mostly related to backwardness in terms of ideas and values rather than a lack of management techniques.  相似文献   

Students’ perceptions of the value of electronic feedback—Does disciplinary background really matter?     

Amr ElShaer  Diogo Casanova  Nicholas S. Freestone  Gianpiero Calabrese 《British journal of educational technology : journal of the Council for Educational Technology》2020,51(2):590-606

Feedback on student work is a key mechanism for improving learning in higher education (HE) and can be provided in a variety of forms. Recently, many institutions have moved to the provision of electronic feedback, although evidence for the effectiveness of this is mixed. While many studies evaluating the students’ perception of feedback are now available, there is little evidence of contrasting perceptions of its value according to different disciplines. This work aims to evaluate the relationship between students’ expectations and perception of feedback, especially electronic, and the disciplinary area of study in HE. Students (n = 1017) across different courses from a post-1992 university in the UK were surveyed and categorised into five disciplinary clusters: Science, Technology, Engineering and Mathematics; Business and Accounting; Art and Design; Media and Languages; and Psychology and Social Care. Perceived relevance as well as the most pertinent features and expectations of the quality of electronic feedback for students varies according to disciplinary cluster and thus closely aligns with a specific cluster’s learning and teaching practices. The findings of this study may help institutions to reflect on the role of electronic feedback as part of their ongoing assessment practice and how teaching in the different disciplines may result in different understandings of the value of electronic feedback.  相似文献   

Science education in urban settings: Seeking new ways of praxis through critical ethnography     

Angela Calabrese Barton 《科学教学研究杂志》2001,38(8):899-917

The challenges faced in urban science education are deeply rooted in the ongoing struggle for racial, class and gender equity. Part of this struggle is tied to huge differences in class and involves making more equitable the distribution of resources. Another part of this struggle is tied to the rich diversity of children who attend urban schools and involves generating new ways of understanding, valuing, and genuinely incorporating into school‐based practices the culture, language, beliefs, and experiences that these children bring to school. Thus, this article argues that to address these two challenges—and indeed to achieve a more just science education for all urban students— explicitly political research methodologies must be considered and incorporated into urban education. One potential route for this is critical ethnography, for this kind of methodology emerges collaboratively from the lives of the researcher and the researched and is centrally about praxis and a political commitment to the struggle for liberation and in defense of human rights. In making this argument, I have drawn from stories from my own research with homeless children. © 2001 John Wiley & Sons, Inc. J Res Sci Teach 38: 899–917, 2001  相似文献   

“Real life use” of troponin in the emergency department: a survey of over 3000 cases     

Matteo Vidali  Enrica Verzotti  Nicole Cabraz  Francesca Santi  Alessia Puma  Giorgio Bellomo  Alessandro Lupi  Giuseppe Lippi  Gian Carlo Avanzi 《Biochemia medica : ?asopis Hrvatskoga dru?tva medicinskih biokemi?ara / HDMB》2015,25(3):421-429

Introduction

The aim of this study was to identify clinical variables which may be independently associated with positivity of a cardiac troponin I (cTnI) assay in a large population of patients admitted to the emergency department (ED).

Materials and methods

3166 subjects, with at least two troponin I tests ordered within 6 hours in the ED, were studied. Patient data were statistically analyzed to identify clinical associations with increased values of Troponin I.

Results

Although patients with diagnosis of acute coronary syndrome displayed troponin I values significantly higher than those of other groups, positivity to troponin I (> 40 ng/L) was also observed in patients with other clinical conditions. In multivariate analysis, age, elevated heart rate and electrocardiographyc changes were independently associated with troponin I positivity at admission. In the whole study population troponin I positivity exhibited high sensitivity and negative predictive value, counterbalanced by low specificity and limited positive predictive value.

Conclusions

Troponin I positivity should be combined with history and clinical evaluation and cautiously interpreted in the ED, especially in patients exhibiting factors associated with higher troponin I levels such as older age, elevated heart rate or ECG changes.Key words: troponin I, acute coronary syndrome, emergency service, hospital, chest pain  相似文献   

New directions for JRST     

Joseph Krajcik  Angela Calabrese Barton 《科学教学研究杂志》2010,47(1):2-5

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