Fault diagnosis for analog circuits based on chaotic signal excitation     

Hong-Guang Ma  Xiao-Fei Zhu  Ming-Shun Ai  Ji-Dong Wang 《Journal of The Franklin Institute》2007,344(8):1102-1112

A fault diagnosis method for analog circuit is proposed in this paper. An all-purpose amplifier is taken as the typical circuit under test (CUT). The chaotic signal, which is generated by an improved Chua's circuit, is employed as the excitation signal of CUT. The algorithm for phase-space reconstruction of chaotic time series is a combination algorithm of multiple autocorrelation and Γ-test. The circuit state is estimated based on detecting the geometric change of Chua's attractor with a data-mining approach. For the purpose of information fusion, another eight features are extracted from the testing data to comprehensively determine the CUT states. A discussion is made for comparing the effectiveness of each feature according to the testing results.  相似文献   

Migrating selves: reconstructing and renegotiating Black immigrant academic identities     

Saloshna Vandeyar 《高等教育研究与发展》2020,39(6):1276-1289

ABSTRACT

This study set out to explore how Black immigrant academics (BIAs) reconstruct their identities within academe. Utilising the research methodology of narrative inquiry, this article explores how BIAs came to see themselves across those communities, which were of primary importance to them in the reformation of their identities. Through the construction of narratives of experience, their lived and told stories emphasised the diversity of their identities that were negotiated with others within personal, historical and situational contexts. The study of BIAs’ lives from their perspective, in which they actively and socially develop their identities, not only provides a lens through which they can be understood as shifting constructions of identity but allows them to rethink who they are and have become and what influence power relations have in promoting or negating their sense of academic self.  相似文献   

Surgical outcomes and strategy of hypertrophic obstructive cardiomyopathy   总被引：1，自引：0，他引：1  

朱亚彬  刘志勇 《Journal of Zhejiang University. Science. B》2006,7(2):148-153

Objective： To evaluate the surgical clinical results of hypertrophic obstructive cardiomyopathy. Methods： We retrospectively collected data on 24 patients who underwent surgical management in the past ten years in two hospitals in China and Madras Medical Mission in India. Myomectomy was carried out on all patients. Among them 3 patients underwent mitral valve replacement; 2 patients underwent mitral valve repair （anterior mitral leaflet plication）; 2 patients underwent aortic valve replacement; 1 patient underwent aortic valve repair; 2 patients underwent aortic root replacement; 1 patient underwent Bentall＇s procedure and 1 patient underwent coronary artery bypass grafting because of a breached muscle bridge, Results： One patient died of post-operative heart failure. The mean follow-up time was 4.3 years, There was significant improvement in the symptomatic status. Sixteen patients were asymptomatic with good effort tolerance and only four patients had New York heart association （NYHA） Classes Ⅰ-Ⅱ due to associated valvular lesions, Conclusion： Our experience proved that symptomatic hypertrophic obstructive cardiomyopathy or non-symptomatic hypertrophic obstructive cardiomyopathy with combined heart disease is indication for surgery as surgical intervention could get better clinical results in this kind of patients compared with other non-surgical method because it beneficially reduces the systolic anterior motion （SAM） of the mitral valve leaflet, which could not be avoided by other non-surgical treatment.  相似文献   

“课程思政”视域下课程内容重构的价值     

张艳敏 《宁波教育学院学报》2020,(1):46-49

实行"课程思政"建设是实现各类课程与思想政治理论课形成协同效应的必然选择。"课程思政"建设的立足点为课程内容重构。课程内容重构要以"一个中心、两个抓手、三个方面"为原则。以立德树人为中心,以课程知识体系和学生政治素养成长为两个抓手,以教师提升、课程研究、政治素养获取为抓手的三个方面,强化课程历史底蕴、内容思政育人的道路自信、内容建构的国际视野,进而实现"课程思政"立德树人目标。  相似文献   

《现代教育技术应用》课程教学模式重构探讨     

林莉 《教育教学论坛》2019,(20):197-199

文章分析了《现代教育技术应用》课程基本情况,罗列了《现代教育技术应用》课程教学模式存在的问题,探讨了《现代教育技术应用》教学模式重构方法":以模块学习为主线,以任务驱动为手段,以多元评价为保障"。  相似文献   

代表人诉讼制度的反思与重构     

于胜刚 《临沂师范学院学报》2006,28(1):50-52

代表人诉讼制度是为解决多数人纠纷而设计的一种当事人诉讼制度。代表人诉讼是我国民事诉讼法特有的处理群体纠纷的诉讼程序制度,它是指当事人一方人数众多时,从中选出数人作为代表进行的诉讼。我国代表人诉讼制度的立法,内容上过于简单、概括,实际操作比较困难,应从立法角度进行完善。  相似文献   

基于压缩感知的电能质量信号重构算法研究     

张秀君  俞国军 《浙江工贸职业技术学院学报》2016,(1):30-33

为解决传统电能质量信号在采样时面临的采样率高,采样资源浪费和硬件成本高的问题,压缩感知理论被引入到电能质量信号的采样与重构过程。信号的稀疏表示是压缩感知理论中的关键问题,一般选择正交基作为压缩感知中的稀疏变换基。基于多重扰动的电能质量信号,本文提出了基于不同干扰的电能质量模型来选择不同的信号稀疏变换基的压缩感知重构算法。实验证明与整个信号采用单一DCT变换基或FFT变换基的压缩感知重构算法相比,本文提出的方法具有更好的信号重构性能。  相似文献   

震灾后心理健康的重建与维护     

周宁  刘将 《成都师专学报》2008,(5):12-15

地震是威胁人类安全的主要自然灾害之一。2008年5月12日发生的汶川大地震不仅严重威胁了人们的生命安全,而且还给人们的心理造成了极大的创伤。震灾后的心理问题,一方面表现为恐惧、悲伤、焦虑等负性情绪反应,另一方面还包括不良的躯体症状与行为反应。按照一些基本的途径做好震灾后心理健康的重建工作,是当前最重要的一项社会性工作。在震灾后及时地总结经验,建立心理援助的制度化服务体系是震灾后心理健康长期维护的基本保障。  相似文献   

概念重建主义课程理论述评     

郇红 《安康学院学报》2007,19(3):96-98

概念重建主义课程理论是美国70年代出现的一个课程理论流派,是一批不满于传统课程理论,试图对课程领域进行概念重建的学者们的课程观点的总称。他们主张课程研究的焦点从课程开发转移到力图理解课程现象,在课程研究领域形成超越“科学研究范式”的新的“人文研究范式”,课程不再是被视为预先制定的外在于师生的“学校材料”,而是师生在共同交往的教学实践中生成的教学事件。  相似文献   

人工智能和智能制造背景下高职机电一体化专业适应性转型与实践     

宋志刚  王文斌  赵伟  常江 《深圳职业技术学院学报》2021,(1)

文章分析了人工智能技术的发展对制造业岗位的影响及机电一体化技术专业需要进行转型的依据,探讨了机电一体化技术专业培养方向、人才规格和培养目标的转型,着重研究专业课程体系与课程的重构、专业教学改革以及教学创新团队的塑造.通过转型实践,机电一体化技术专业适应性转型呈现三大特色:一是紧跟智能装备与产业升级,探索多学科多领域多专业技术融合,深度整合课程,构建模块化课程体系:二是采用信息化教学,建设数字化课程,虚实结合开展技能训练;三是杰出人才引领,构建校企融合教学团队.  相似文献