基于运动振幅统计的无参考电子稳像算法性能评价方法

结合人眼视觉特性,提出了1种基于帧间运动振幅统计的视频稳定质量评价算法,以相邻帧间的仿射变换矩阵作为运动模型,计算运动轨迹波峰/波谷位置的振幅值;然后根据波峰/波谷出现的频率,振幅均值以及振幅标准偏差,建立视频稳定性度量模型,实现无参考的电子稳像算法性能评价。实验表明,该算法与主观评价结果具有较高的一致性,可以有效地评价电子稳像算法性能。     

Design and evaluation of an electronic performance support system for quantitative data analysis

Education and Information Technologies - The purpose of the current research was to develop an electronic performance support system (EPSS) for quantitative data analysis by using design-based...     

On‐line professional staff development: An evaluation study

This paper reports the design, implementation, and evaluation of a teleseminar on instructional design (ID) and computer‐mediated communication (CMC) for the purposes of staff development at The University of Southern Queensland, Toowoomba, Australia. Participation was open to any staff with an involvement or interest in distance education. This study was motivated by the following research questions: Is CMC a viable medium for the professional development of staff in distance education? Does the nature of moderation of CMC‐based discussions influence the nature of contributions from subscribers? Do participants use different strategies (interactive, cognitive, and metacognitive) in CMC‐based discussions? To address these questions a teleseminar was instituted with a focus on the issues of ID and CMC. CMC‐based moderation techniques were used to manage the discussion. Both qualitative and quantitative evaluation tools were used to measure the outcomes of the teleseminar. Results of these evaluation data show that CMC proved to be a viable medium for the professional development of staff, that the moderation strategies influenced the nature of contributions from the subscribers, and that participants used a range of strategies to manage the discussion and their participation in it.     

电控发动机故障诊断实验台的设计与研究

设计和研究了电控汽油发动机故障实验台。实验台能够准确、直观地显示发动机电控系统的数据流和故障码，并能设置故障。试验台为电控发动机的故障诊断提供了方法，汽车维修技术人员可借助该实验台进行数据流分析和故障码分析，来诊断电控发动机的故障，学生也可进行电控发动机理论和故障诊断的学习。     

Participatory evaluation: implications for improving electronic learning and teaching approaches

This paper examines the participatory approach used by a group of academic support staff in evaluating an academic professional development resource designed to support e‐learning and teaching. The resource, titled Designing Electronic Learning and Teaching Approaches (DELTA), showcases examples of electronic learning and teaching approaches developed at Monash University, Australia. The evaluation included individual and collective reflection, dialogue and action, drawing on the features of participatory action research. This paper explores the value of this critically reflective, participatory approach for evaluation to improve the use of new learning technologies, demonstrating how it provided a clear decision‐making framework for iterative improvement of the DELTA site by identifying consensus items for action and recording other items for later consideration, while also contributing to team members’ own professional development.     

An interactive learning environment (ILE) to study statistics: Effects of prior knowledge on the use of embedded support devices

The present contribution focuses on an interactive learning environment for the delivery of distance education learning materials. The use of such an interactive learning environment is foreseen in a distance education context in which students explore and study (part) of the learning materials by means of a personal computer. Research with interactive learning environments is transposed to the development of a course delivery environment, called ILCE, that also supports the development of a course model and learning materials. A learning environment as used in the present study allows students to access the course materials in a more flexible way. The printed self-study materials often do not correspond with the specific needs of a student, are only weakly related to his or her prior knowledge, or do not take account of differences in learning style. Although the printed course materials include text-embedded support devices (e.g., examples, exercises, illustrations), it is questioned whether the available devices provide enough support for each individual student. Therefore, it is argued that an interactive learning environment — in which a student is actively engaged in selecting learning materials (basic content and embedded support devices) — may provide a valuable tool in order to meet the individual needs of the student. Prototypes of an interactive learning environment were tested in two experimental settings. It appeared that all students were actively engaged in selecting the required support devices. However, the results showed that students with a high prior knowledge state manifested a higher amount of interactive use of support devices than their peers with a low prior knowledge state. The latter was especially found for support devices that either reinforce the acquisition process or provide a tool to test one’s mastery level.     

Motivation for learning statistics: An example from fishery and aquaculture science

Teaching statistics to generalist students oriented toward a profession, rather than academic merits, may be challenging. As statistics courses also tend to have a low student appeal, tailoring a course toward this type of audience is demanding. Framed within the theory of statistical thinking and literacy, this article shows how an investigative process, using domain data and real-life examples, may facilitate meaningful learning and motivate students. Describing and reflecting upon the methods used, both in teaching and assessment, the article contributes to the practice of teaching statistics.     

An evaluation study of youth participation in youth work: a case study in Southern Italy

In this paper an evaluation study of a public programme financing a regional network of 157 youth centres in the South of Italy is presented. A theory-based evaluation model was adopted to explore the causal links between different types of participation experience. Evaluation questions focused on three main issues are: the perception of empowerment of the team during the management of the centres, the empowering effect of participation in the organization of the youth centres and the decision-making abilities of the young people involved. Following an exploratory study, an on-line structured questionnaire was administered to all centres. New youth centres appear as striving to become sustainable enterprises. However, there is widespread difficulty in terms of integrating day-to-day management with sustainability strategies. Such difficulty appears less pronounced when project leaders participated in the design of the centres together with young people. Results thus confirm participation in the design phase as an empowering experience. This study warns, however, against a number of unwanted effects arising from participation. Indeed, participation processes represented a form of decorative consultation in half of the cases. Empirical evidence therefore suggests further research to focus on the creation of stable participation frameworks inside centres, avoiding the risk of participation processes void of any real effect on decision-making.     

An evaluation of an electronic simulation of hearing impairment in the training of mainstream teachers

This paper describes an evaluation of a simple electronic simulation of sensorineural hearing loss intended to raise the awareness of mainstream trainee teachers during role play as both teacher and hearing-impaired pupil. In the wake of the continuing commitment to integration, it is hoped that such a device can improve the preparation of mainstream trainee teachers for their role as teachers of the hearing impaired. Twenty-four trainee teachers experienced both roles during the simulation, and their comments were scored by an expert panel for their importance. It was found that participants achieved a significant increase in awareness during their two five-minute simulated experiences of being a hearing pupil and teaching a hearing-impaired pupil. The experience of learning as a pupil with a simulated impairment was demonstrated to be as valuable as teaching a pupil with a simulated impairment, although there were differences with respect to the types of issues highlighted.