排序方式： 共有106条查询结果，搜索用时 15 毫秒
31.
Jonas Richiardi Andrzej Drygajlo Plamen Prodanov 《Journal of The Franklin Institute》2006,343(6):574-595
Speaker verification is a biometric identity verification technique whose performance can be severely degraded by the presence of noise. Using a coherent notation, we reformulate and review several methods which have been proposed to quantify the uncertainty in verification results, some with a view to coping with the effects of mismatched training-testing environments. We also include a recently proposed method, which is firmly rooted in a probabilistic approach and interpretation, and explicitly measures signal quality before assigning a reliability value to the speaker verification classifier's decision. We evaluate the performance of the confidence and reliability measures over a noisy 251-users database, showing that taking into account signal-domain quality can lead to better accuracy in prediction of classifier errors. We discuss possible strategies for using the measures in a speaker verification system, balancing acquisition duration and verification error rate. 相似文献
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Jonas A. Montilva Beatriz Sandia Judith Barrios 《Education and Information Technologies》2002,7(3):201-224
This paper focuses on the application of software engineering practices to the development of instructional web sites. The development of a web site, to support a distance or campus-based online course, is a very complex process that involves many instructional and technical aspects, including the instructional purpose of the course, its content, its structure, its interface, and its teaching–learning activities. The use of a method is essential for dealing with the complexity of this process. We describe, in this paper, a software engineering method that helps course designers and teachers to develop high quality instructional web sites. The design of the method was based on the integration of well-known principles, concepts and process models borrowed from instructional design, method engineering, and object-oriented software engineering. The method addresses the managerial processes required to plan, organize, and control the project, as well as the instructional and technical activities involved in the development of high quality course sites. 相似文献
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Environmental Education Research has developed a Virtual Special Issue (VSI) (http://explore.tandfonline.com/content/ed/ceer-vsi) focusing on studies of environmental and sustainability education (ESE) policy. The VSI draws on key examples of research on this topic published in the Journal from the past two decades, for three reasons. First, to provide readers with a series of snapshots into the genealogy of ESE policy research in this field. Second, to encourage renewed attention to previously published work. And third, to offer commentary on the evolution of research trends, approaches and findings. 相似文献
34.
Jonas Flodén 《Assessment & Evaluation in Higher Education》2017,42(7):1054-1068
Receiving feedback from students has become a normal part of life for university teachers worldwide. This puts pressure on them from several sides and may be an influential factor that leads them to tailor their teaching to students’ preferences. The aim of this study was to investigate teachers’ perceptions of student feedback and how it affects their teaching choices. A survey was sent out to all teachers at the School of Business, Economics and Law at the University of Gothenburg, Sweden. The study found that student feedback is perceived positively by university teachers, has a large impact on their teaching and helps improve courses. Student feedback pushes teaching in the direction of fewer lectures and more tutorials, seminars and case studies. Teachers receiving negative student feedback experience more negative feelings related to the feedback, and are also more likely to introduce unjustified changes to their teaching in order to please students. These teachers also tend to have less teaching experience. However, a very large majority of teachers have a high level of professional pride and integrity and do not make (as they perceive them) unjustified changes to their teaching. 相似文献
35.
Joaquin Calatayud Jonas Vinstrup Markus D. Jakobsen Emil Sundstrup Juan Carlos Colado Lars L. Andersen 《Journal of sports sciences》2018,36(10):1162-1166
The purpose of this study was to investigate whether using different focus affects electromyographic (EMG) amplitude and contraction duration during bench press performed at explosive and controlled speeds. Eighteen young male individuals were familiarized with the procedure and performed the one-maximum repetition (1RM) test in the first session. In the second session, participants performed the bench press exercise at 50% of the 1RM with 3 different attentional focuses (regular focus on moving the load vs contracting the pectoralis vs contracting the triceps) at 2 speed conditions (controlled vs maximal speed). During the controlled speed condition, focusing on using either the pectoralis or the triceps muscles increased pectoralis normalized EMG (nEMG) by 6% (95% CI 3–8%; p = 0.0001) and 4% nEMG (95% CI 1–7%; p = 0.0096), respectively, compared with the regular focus condition. Triceps activity was increased by 4% nEMG (95% CI 0–7%; p = 0.0308) at the controlled speed condition during the triceps focus. During the explosive speed condition, the use of different focuses had no effect. The different attentional focus resulted in comparable contraction duration for the measured muscles when the exercise was performed explosively. Using internal focus to increase EMG amplitude seems to function only during conditions of controlled speed. 相似文献
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The article draws on body pedagogics and considers that teaching and learning experiences and outcomes are directly related to the different characteristics of movement behaviour. In this article movement behaviour specifically centres on a sloyd (handicraft education) teacher’s walk through the classroom. The analysis illuminate the specific teaching use of the body as a spatial, temporal and situational movement rhythm in the classroom and how teachers and pupils tune into educational discourses by means of different body techniques. A wireless GoPro camera was attached to the teacher’s chest in order to gain detailed view of pupil–teacher–body–material–tool encounters and a specific visual perspective of the sloyd teacher’s walk. During a 2.5 years fieldwork, 25 wood–metal sloyd lessons were observed and recorded (circa 50 h of video). The study is informed by Dewey’s embodied theory of learning and focus the alternation between active and passive phases in the stream of experience. From such Deweyan perspective the rhythm of an activity for organising experience, is fundamental to the creation of intelligent moving habits. The results show the body pedagogic experiences, outcomes and means by highlighting the teacher’s (a) spatial path by describing mutual relationships between the material arrangement of the classroom, the teacher’s bodily movements and the pupils’ participation in the lesson, (b) temporal pace by his ‘flights and perchings’ through the lessons and how he moves from pupil to pupil and assignment to assignment, (c) specific pacts by describing body techniques and situated teacher–pupil encounters that terminate in an agreement about how to proceed. 相似文献
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Janne Cadamuro Peter Bergsten Katharina Mrwald Anders Forslund Marie Dahlbom Jonas Bergquist Iris Ciba Susanne M. Brunner Jeanne Jabbour Daniel Weghuber 《Biochemia medica : ?asopis Hrvatskoga dru?tva medicinskih biokemi?ara / HDMB》2022,32(1)
During a dual-center study on obese and normal weight children and adolescents, focusing on glucose metabolism, we observed a marked difference in glucose results (N = 16,840) between the two sites, Salzburg, Austria and Uppsala, Sweden (P < 0.001). After excluding differences in patient characteristics between the two populations as cause of this finding, we investigated other preanalytic influences. Finally, only the tubes used for blood collection at the two sites were left to evaluate. While the Vacuette FC-Mix tube (Greiner Bio-One, Kremsmünster, Austria) was used in Uppsala, in Salzburg blood collections were performed with a lithium heparin tube (LH-Monovette, Sarstedt, Germany). To prove our hypothesis, we collected two blood samples in either of these tubes from 51 children (Salzburg N = 27, Uppsala N = 24) and compared the measured glucose results. Indeed, we found the suspected bias and calculated a correction formula, which significantly diminished the differences of glucose results between the two sites (P = 0.023). Our finding is in line with those of other studies and although this issue should be widely known, we feel that it is widely neglected, especially when comparing glucose concentrations across Europe, using large databases without any information on preanalytic sample handling. 相似文献
38.
This article introduces the themes of a virtual special issue (VSI) of Environmental Education Research (http://explore.tandfonline.com/content/ed/ceer-vsi) focused on policy research in environmental and sustainability education (ESE). The broad purpose behind preparing the VSI was to consider the challenges involved in linking particular concepts of environment and sustainability with key themes in educational policy, and how this remains a heavily contested practice. Examples drawn from two decades of studies published in the journal show how these might be illustrated, addressed, problematized and possibly transcended. The introduction traces how ESE researchers have dealt with key trends, complexities and issues in the policy-practice-research nexus both conceptually and empirically. It also illustrates how researchers within the field might reimagine and reinvigorate policy research on ESE, and how working with researchers from other fields who offer different perspectives, ideas and expertise might aid the cross-fertilisation of a complex terrain of ideas, policy and practice. In so doing, we hope the accompanying VSI inspires renewed interest into the (at times, fickle) relationship between ESE, and the dual worlds of possibility and tension that take place both within, and surrounding, their fields of policy and research. 相似文献
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