Interactive Techniques Used in Teachers' Oral Feedback and Its Impact on Students' Participation

English language teaching is facing a reformation with the emphasis of students-centered learning approach and communicative language learning. Classroom interaction becomes popular especially during teachers' oral feedback. In order to involve more students to participate, interactive techniques are applied in the classroom such as elicitation and recasts. This essay will focus on the adoption of interactive techniques in teachers' oral feedback in terms of a specific grammar lesson and try to explore its impact on students' participation.

Research on the Novel Business English Education Mode based on Feedback Learning and Interactive Teaching Method

In this paper, we conduct research on the novel English education mode based on feedback learning and interactive teaching method. Business English, which is based on general English, from the angle of English language features of text represents connotation of business English vocabulary expressed more, word ambiguity phenomenon is relatively common, meaning and pragmatic choice depends on the context. Our research starts from the analysis of the novel education pattern with the feedback learning and interactive teaching integration. Our education mode will let the students and the teachers interact with others and encourage the better participation passion that is meaningful.

Emerging interactively stretchable electronics with optical and electrical dual-signal feedbacks based on structural color materials

The booming development of wearable devices has aroused increasing interests in flexible and stretchable devices.With mechanosensory functionality,these devices are highly desirable on account of their wide range of applications in electronic skin,personal healthcare,human–machine interfaces and beyond.However,they are mostly limited by single electrical signal feedback,restricting their diverse applications in visualized mechanical sensing.Inspired by the mechanochromism of structural color materials,interactively stretchable electronics with optical and electrical dual-signal feedbacks are recently emerged as novel sensory platforms,by combining both of their sensing mechanisms and characteristics.Herein,recent studies on interactively stretchable electronics based on structural color materials are reviewed.Following a brief introduction of their basic components(i.e.,stretchable electronics and mechanochromic structural color materials),two types of interactively stretchable electronics with respect to the nanostructures of mechanochromic materials are outlined,focusing primarily on their design considerations and fabrication strategies.Finally,the main challenges and future perspectives of these emerging devices are discussed.

CISK Kelvin Wave with Evaporation-Wind Feedbackand Air-Sea Interaction-A Further Study ofTropical Intraseasonal Oscillation Mechanism

The wave-CISK (cumulus convection heating feedback), the air-sea interaction and the evaporation-wind feedback are together introduced into a simple theoretical model, in order to understand their effect on driving tropical atmospheric intraseasonal oscillation (ISO). The results showed that among the introduced dynamical processes the wave-CISK plays a major role in reducing phase speed of the wave to be closer to the observed tropical ISO. While the evaporation-wind feedback plays a major role in unstabilizing the wave. The air-sea interaction has certain effect on slowing down the phase speed of the wave. Therefore, the wave-CISK and evaporation-wind feedback can be regarded as fundamental dynamical mechanism of the tropical ISO. This study also shows that since the effects of the evaporation-wind feedback and the air-sea interaction were introduced, the excited wave is zonally dispersive, which can dynamically explain the activity feature of the observed ISO in the tropical atmosphere very well.

Information perception and feedback mechanism and key techniques of multi-modality human-robot interaction for service robots

With the increasing of the elderly population and the growing hearth care cost, the role of service robots in aiding the disabled and the elderly is becoming important. Many researchers in the world have paid much attention to heaRthcare robots and rehabilitation robots. To get natural and harmonious communication between the user and a service robot, the information perception/feedback ability, and interaction ability for service robots become more important in many key issues.

Measurement and Characterization of Microwave Interaction between Integrated Distributed Feedback Laser Diode and Electro-Absorption Modulator

Integrated electro-absorption-modulated distributed feedback laser diodes(EMLs)are attracting much interest in optical communications for the advantages of a compact structure,low power consumption,and high-speed modulation.In integrated EML,the microwave interaction between the distributed feedback laser diode(DFB-LD)and the electro-absorption modulator(EAM)has a nonnegligible influence on the modulation performance,especially at the high-frequency region.In this paper,integrated EML was investigated as a three-port network with two electrical inputs and a single optical output,where the scattering matrix of the integrated device was theoretically deduced and experimentally measured.Based on the theoretical model and the measured data,the microwave equivalent circuit model of the integrated device was established,from which the microwave interaction between DFB-LD and EAM was successfully extracted.The results reveal that the microwave interaction within integrated EML contains both the electrical isolation and optical coupling.The electrical isolation is bidirectional while the optical coupling is directional,which aggravates the microwave interaction in the direction from DFB-LD to EAM.

用于触摸屏交互的可穿戴指端力反馈系统设计

力触觉再现技术在增强用户与触摸屏交互的真实感和沉浸感方面发挥着越来越重要的作用,设计了一种面向触摸屏图像信息感知的可穿戴指端力反馈装置。设计基于线绳牵引驱动的指端力反馈机构,将装置分为驱动和可穿戴部分,使其具备小巧、轻便、易佩戴的特点。设计测控系统,实现了输出反馈力的检测和控制。研究图像信息提取和力触觉建模算法,获取图像中物体的三维特征信息,配合力反馈装置和测控系统实现图像纹理高度、外形轮廓信息再现反馈。实验结果表明,该装置最大可以提供5.3 N的反馈力,能够帮助用户感知触摸屏中图像的高度和形状信息。

沉浸式虚拟现实中加入触觉反馈对学习效果的影响——来自消防安全教育的证据

随着虚拟现实硬件设备的快速普及和使用成本的降低,沉浸式虚拟现实(IVR)在教学中的应用逐渐增多,但其研究大多关注视觉和听觉体验,对引入触觉反馈后在学习效果提升上的有效性仍缺乏证据。消防安全教育是IVR的典型应用场景,探究在IVR消防安全教育系统中加入触觉反馈(力反馈和热感)对学习者学业成绩、学习动机和认知负荷的影响,有助于为优化IVR教学应用提供依据。基于该情境的对照实验结果表明:IVR能够显著促进学习者对程序性知识、事实性知识和概念性知识的学习,并且加入触觉反馈后的知识增益更高,更加有利于程序性知识的习得;触觉反馈的加入显著降低了学习者的认知负荷,尤其是外在认知负荷,但对学习者学习动机的影响并不显著。研究结论为多媒体学习中触觉通道的整合提供了新的证据,拓展了原有多媒体学习的认知理论框架,有助于指导IVR教育资源的设计、开发及应用。

同伴纠正性反馈效果研究综述

反馈(feedback)最早来源于控制论。在教育教学中,有效反馈可以促进学习者的学习与发展。反馈可分为正反馈和负反馈,其中纠正性反馈属于负反馈的重要分支。纠正性反馈根据不同来源可分为教师纠正性反馈、同伴纠正性反馈和自我纠正性反馈。文中聚焦同伴纠正性反馈,将自我效能感、社会文化和认知互动作为理论支撑,以学习者投入这一概念为切入点,回顾并总结同伴纠正性反馈对学习者情感、行为和认知投入三个维度的有效性:学习者因为对同伴纠正性反馈有兴趣,进而提高其学习自信、增强学习内在动机;反馈者和被反馈者均通过同伴纠正性反馈提升个人学习能力;学习者通过识别修正错误、监控学习过程,促进意义创建和知识构建,进而提升个人认知水平。最后概括并归纳同伴纠正性反馈的局限性,对未来的研究方向提供建议。

触摸屏按键设计对交互绩效与用户体验的影响

为了系统考察声音反馈、按键尺寸、按键间距对于触屏交互绩效和负荷的影响,设计开展了2项试验。30名和24名志愿者分别在声音反馈(有/无)和按键尺寸(5,10,20 mm)组合条件,以及按键尺寸(8,11,14,17 mm)和按键间距(1,4 mm)组合条件下开展数字输入任务,记录输入速度、输入准确率和主观评价。结果表明:声音反馈可提升触屏交互绩效,在按键尺寸为5 mm时提升效果较明显。按键尺寸方面,10 mm和20 mm尺寸的触屏交互绩效无显著差异;当按键尺寸减小到8 mm时,绩效变差;减小到5 mm时,绩效大幅变差;14 mm具有最优的交互绩效和主观满意度。按键间距方面,4 mm间距的触屏输入正确率及主观满意度显著高于1 mm间距。综合手指触屏区域宽度的测量数据,推荐最小适宜按键尺寸为11~14 mm,适宜按键间距为4 mm,并建议在触屏交互中加入按键声音反馈。

引入智能虚拟讲解员的云展厅构建与交互反馈研究

奥林匹克遗产是全人类的宝贵财富,利用科技与文化艺术相融合,对实现北京冬奥会及奥林匹克遗产和精神文化的多元呈现和高效传播至关重要.线上云展厅作为信息时代数字博物馆发展的重要趋势,虽然在单项数字博物馆与交互系统技术研究方面已具备较好的基础,但尚未形成体系化、智能化、交互友好的冬奥会奥林匹克数字博物馆系统.面向北京2022年冬季奥林匹克运动会,提出一种具有交互反馈的云展厅系统构建方式,通过构建具有虚拟讲解员的智能交互云展厅,进一步探索交互反馈在知识传播型的数字博物馆中对于非物质文化遗产的传播作用.为了探索视听交互反馈对云展厅的奥林匹克精神文化传播的影响,同时提升知识传播型云展厅中的用户体验,对32名参与者进行用户实验.研究结果表明,所构建的云展厅能够极大地促进奥林匹克文化与精神的传播;同时,在云展厅中引入视听交互反馈能够提高用户的感知控制,从而有效地提升用户体验.

社会互动理论视角下课堂信息反馈的缺失表征及重构路径

课堂信息反馈作为教师和学生之间一种重要的信息交流手段,对学校的教育教学活动有着至关重要的作用,但在教学实践中普遍采用的以行为主义等传统理论为指导的课堂信息反馈方式早已不能适应并促进学生学习和教师教学水平的提高。社会互动理论为教学中的课堂信息反馈提供了新的研究视域。基于该理论分析发现:课堂信息反馈是师生基于一定社会符号交往的互动过程,这种师生互动有助于提高教学效果、提高学生学习效能。因此,在教学过程中教师要以学生为中心,保证课堂信息反馈的发展性;审视反馈过程中的干扰因素,提升课堂信息反馈的适切性;重视课堂内容的预设与生成,呈现课堂信息反馈的灵活性,以改善教学中课堂信息反馈的效果。

力触觉反馈装置发展概述

力触觉反馈技术起源于主从机器人领域,能够给操作者带来真实沉浸的体验,提高操作效率。近年来,随着遥操作、虚拟现实等技术的发展,力触觉反馈装置得到了研究人员的高度关注。首先,简要总结了力触觉反馈技术的发展状况;然后,对现有力触觉反馈装置进行了分类,介绍了近年来力触觉反馈装置的研究情况;最后,针对现有研究,分析和阐述了力触觉反馈装置的发展趋势,并指出了目前存在的问题,对力触觉反馈装置未来所面临的机遇与挑战提出了一些见解。

基于纹理图像和用户动作信息的纹理触觉再现方法研究

近年来,对虚拟表面纹理进行工具介导的振动触觉再现已经成为触觉领域的一个研究热点。针对已有的纹理触觉渲染方法还存在适用范围窄、泛化能力弱、交互真实感低等问题,以改进后的MelGAN为基本网络,构建了一种新的纹理触觉渲染模型。该模型以纹理图像和用户的实时动作信息为输入,在能够高保真地生成振动触觉信号的同时,对常见纹理图像拥有更好的泛化能力。此外,设计了一款具有动作信息实时采集和振动触觉表达功能的笔式装置。在采集了数据库之外的真实纹理表面的振动触觉信号后,比较了提出的模型与已有方法在信号生成方面的性能差异。结果表明,模型实现了最低的均方根误差(0.173),验证了其对未建模纹理进行触觉渲染的能力。最后,使用笔式装置进行了两项用户实验。平均6.01的主观相似度评分说明,即使是数据库之外的新纹理,模型也能为用户提供较高的纹理交互真实感。

师生互动中组块化反馈促进长时学习迁移:行为和近红外超扫描研究

精细内容反馈促进深层次的学习,如迁移。但在师生互动中反馈的呈现方式如何影响长时学习迁移及其人际神经基础尚不清楚。本研究采用面对面的师生问答反馈任务,通过两个双人实验(行为学、近红外超扫描),探究反馈的组块化呈现对学习迁移的长时促进作用、认知过程及其人际神经基础。结果发现,组块化反馈促进低知识基础学生的长时迁移。组块化错误修正在反馈呈现方式和长时迁移之间起中介作用。提供与接收组块化反馈过程中,师、生在额、顶叶出现更大的脑间同步,且额叶的脑间同步预测长时迁移与组块化错误修正。上述结果从人际视角为课堂中真实发生的教学反馈的认知神经基础提供新的理解,也为提高教学反馈效果和效率提供一些实践启示。

基于深度学习的心理情绪智能交互与反馈系统

为了有效提高机器人的智能交互水平,设计一种基于深度学习的的心理情绪智能交互系统。通过分离卷积实现深度学习,对人的面部表情(喜悦、伤心、气愤、恐惧等)进行分析和特征提取,实验结果显示训练后的模型对面部表情测试集的识别准确率可达71.1%。系统分别设计了与6种不同面部表情向对应的NAO机器人肢体动作,实验结果表明,机器人可在2 s内完成识别并进行动作反馈,且连续10帧的识别结果较为准确。

基于数-物模型混合交互反馈的结构近实时震害评估理论框架

科学合理的结构震害评估对于提升城市抗震韧性与运维智慧具有重要意义。针对韧性城市构建现阶段的实际需求与重要难题,面向“全域、动态、实时”的结构震害评估新范式,以基于数模的多模态特征融合和基于物模的多层次数值仿真模拟为理论架构的两大基本要素,依托深度学习、数字孪生、数物融合等新技术,提出了基于数-物模型混合交互反馈的结构近实时震害评估理论框架,并对该框架中的主要研究内容与关键科学问题进行了详细阐述。所提出的理论架构有望提升结构震害评估的实时性与智能性,助力推进韧性城市构建以及城市系统的智慧运维。

On Teacher's Feedback from the Perspective of Communication

Classroom interaction involves many aspects,among which teacher's feedback is an important element.This paper aimes at studying teacher's feedback from the perspective of communication.It first discusses the definition of teacher's feedback and analyses the functions of teacher's feedback in the classroom interaction and then explores some strategies for effective feedback based on communication theory.

混合级联直流输电系统整流/逆变不同控制回路动态交互作用与稳定性研究

为了研究混合级联直流输电系统整流侧和逆变侧各换流器控制系统间的交互作用,文中首先建立混合级联直流输电系统的状态空间模型,并推导得到系统的多输入多输出传递函数模型。然后针对不同的研究目标,根据单通道分析设计理论建立等效单输入单输出反馈控制模型;在此基础上,分离出不同控制回路的耦合控制通道,定量评估系统强度、逆变侧交流联络线与控制参数等对控制回路间交互作用的影响。理论分析表明,当整流侧或逆变侧交流系统强度降低时,两侧控制回路间交互作用增强;当交流联络线长度缩短时,逆变侧电网换相换流器(line commutated converter,LCC)和模块化多电平变换器(multilevel modular converter,MMC)控制回路间的动态交互增强,各控制环节参数之间存在相互制约关系。最后,在PSCAD/EMTDC上搭建混合级联直流输电系统的电磁暂态详细仿真模型,验证所建立单输入单输出反馈控制模型及上述理论分析结果的正确性。

薄膜反馈式节流器的结构设计

薄膜反馈式节流器因反馈精度高,常被用于液体静压转台中。目前,国内液体静压转台高精度缺乏、需求激增,为了提高转台精度,设计了一种新型薄膜反馈式节流器,以获得稳定的高刚度油膜,并采用Ansys进行双向流固耦合分析,获得液压油的流速和压力分布;然后,对比PM流量控制器,结果表明随着入口压力的增加,两者的薄膜最大变形量均呈近似线性关系递增,其递增率仅相差0.11,因此证明所设计的节流器是合理可行的;最后,对基于薄膜反馈式节流的液体静压转台进行性能测试,结果表明转台的各项性能指标均能达到要求:承载力大于1000 kg、刚度大于2077 N/μm、轴向跳动小于1μm,表明设计的节流器是合理可行的。