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速度场与意图角双重变导纳主动康复训练策略研究
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作者 李辽远 韩建海 +3 位作者 李向攀 郭冰菁 杜敢琴 王新杰 《西安交通大学学报》 EI CAS CSCD 北大核心 2023年第7期9-19,共11页
针对主动康复训练中出现训练懈怠、控制器和训练表现表征指标复杂、训练任务不能动态调整的问题,提出基于速度场与意图角的双重变导纳控制策略。在期望轨迹周围设计速度场后基于双曲正切函数将患者主动力映射到导纳参数中,设计变导纳控... 针对主动康复训练中出现训练懈怠、控制器和训练表现表征指标复杂、训练任务不能动态调整的问题,提出基于速度场与意图角的双重变导纳控制策略。在期望轨迹周围设计速度场后基于双曲正切函数将患者主动力映射到导纳参数中,设计变导纳控制器。只有患者施加主动力时,导纳控制才能输出机器人运动的驱动力,迫使患者主动参与。将末端交互力矢量与速度矢量的夹角定义为意图角,利用位于[0,π/2)内意图角出现的时间在单次训练时间中的占比γ表征患者的主动控制能力。训练中,根据上一轮的γ来修改导纳参数的上限值,从而改变训练任务的难易程度。在控制策略下进行了6轮训练,结果表明:提出的主动训练策略能够在患者施加主动力的情况下实现三维轨迹允许误差范围内的无时序跟踪训练;根据设计的表征指标,导纳参数可以从1100变为1200再变到1100,单轮的训练时间从45.6 s变为31.82 s再变回46.9 s,期间患者输出的主动力总和从892.2 N变为694.4 N再变到1014 N。训练策略可以根据表征指标来判断患者的主动训练能力并调整训练任务,可用于主动康复训练。 展开更多
关键词 上肢康复 速度场 意图角 变导纳 主动训练
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PRAGMATIC ADAPTABILITY OF TEACHER'S CODESWITCHING
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作者 王琳 《Chinese Journal of Applied Linguistics》 2007年第6期66-73,127,共9页
Codeswitching is one of teacher's strategies used in foreign language classrooms in order to approach or realize some teaching or communicative purposes.Based on Verschueren's Linguistic Adaptation theory,this... Codeswitching is one of teacher's strategies used in foreign language classrooms in order to approach or realize some teaching or communicative purposes.Based on Verschueren's Linguistic Adaptation theory,this article is a detailed analysis of the pragmatic adaptability that teacher's codeswitching can fulfill.We classify the objects to which teacher's codeswitching adapts into the linguistic reality,the teacher's roles and the teacher's speech intention. 展开更多
关键词 pragmatic adaptability teacher's codeswitching linguistic reality teacher's roles speech intention
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Generic Variation & Private Intention: A MultiDimensional Exploration of Book Reviews and Prefaces
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作者 Liang XIAO Liming DENG 《Chinese Journal of Applied Linguistics》 2018年第1期47-66,120,共21页
Based on Bhatia's multi-dimensional analytical framework for discourse analysis, we explore key issues involved in genres construction such as private intention, manipulation of generic value and interdiscursive stra... Based on Bhatia's multi-dimensional analytical framework for discourse analysis, we explore key issues involved in genres construction such as private intention, manipulation of generic value and interdiscursive strategies. Two prefaces and two book reviews by expert linguists were collected and analyzed at great length from both text-internal and text-external perspectives. Meanwhile, four professionals from relevant disciplines were interviewed for their insights into the issues investigated. Through examining textual features, covert interdiscursivity and narrative accounts of the professional writers, the following findings are generated. 1) Generic variation occurs within and between the two genres due to expert writers' intentional manipulation of generic value. 2) Interdiscursive strategies like "genre embedding", "genre bending" and "genre mixing" are exploited by expert writers to achieve their particular private intention. Specifically, preface genre can be presented, to some extent, as a research article mixed with some promotional flavor, and features of research article genre, promotional genre and introductory genre are found mixed in the review genre. 3) Representations of the preface and book review genres such as linguistic feature, move structure and interdiscursivity are ultimately affected by generic value, authors' private intention, professional practice and disciplinary culture. The findings have important implications for ESP/EAP writing practitioners and learners. 展开更多
关键词 text-internal text-external private intention INTERDISCURSIVITY generic value multi-dimensional analytical perspective
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