SOFC temperature evaluation based on an adaptive fuzzy controller     

Xiao-juan Wu  Xin-jian Zhu  Guang-yi Cao  Heng-yong Tu 《浙江大学学报(A卷英文版)》2008,9(5):688-694

The operating temperature of a solid oxide fuel cell （SOFC） stack is a very important parameter to be controlled, which impacts the performance of the SOFC due to thermal cycling. In this paper, an adaptive fuzzy control method based on an affine nonlinear temperature model is developed to control the temperature of the SOFC within a specified range. Fuzzy logic systems are used to approximate nonlinear functions in the SOFC system and an adaptive technique is employed to construct the controller. Compared with the traditional fuzzy and proportion-integral-derivative （PID） control, the simulation results show that the designed adaptive fuzzy control method performed much better. So it is feasible to build an adaptive fuzzy controller for temperature control of the SOFC.  相似文献   

一种模型参考自适应速度辨识的异步电机直接转矩控制及其计算机仿真     

孙文  殷洪军 《科技广场》2007,(3):31-33

本文从异步电机的数学模型出发,在直接转矩控制的基础上,介绍了一种新型的基于反电动势的模型参考自适应的无速度控制方法,并对该方法进行了仿真验证。实验表明,该方法效果良好。  相似文献   

噪声主动控制的进展及发展趋势     

刘日山  黄敬党  成峰 《福建师大福清分校学报》2008,(2):56-59

对噪声主动控制技术领域的进展及发展趋势进行综述.包括消声原理、消声器结构和算法等方面的研究成果,分析该技术存在的缺陷,对今后的主要发展方向作出预测.  相似文献   

(Re)framing a philosophical and epistemological framework for teaching and learning in STEM: Emerging pedagogies for complexity     

Thomas Delahunty  Richard Kimbell 《British Educational Research Journal》2021,47(3):742-769

Today’s learners are engaging in study where access to knowledge is easier than it ever has been in human history. Rapid advancement of technology and the increasing ease with which communication and interaction can occur has dramatically changed the landscape in which teachers of science, technology, engineering and mathematics (STEM) operate. The contemporary skills that students are required to possess include inter alia problem solving, creativity, teamwork abilities, communication skills and emotional intelligence. Despite the universal acceptance of their importance, these skills are commonly cited as underdeveloped and in addition, are still accompanied by outmoded ‘traditional’ forms of teaching and assessment. While the approaches of twentieth-century education were successful in developing knowledge stores, the ubiquity of access to knowledge—coupled with the constantly changing nature of the world today—requires alternative conceptions of teaching and learning. This article focuses primarily on an exploration of learning metaphors and teaching with the overall lens of creating self-regulated and furthermore, self-determined learners. The article begins with an exploration of learning in STEM education and a critique of the pedagogical perspective, discussing why this epistemology may be insufficient for contemporary STEM learning. The article then considers an alternative and potentially more contemporary notion; the emergent pedagogic space. The article presents a theoretical model to conceptualise learning in STEM education, with the goal of informing both practice and research. The realisation of this proposed emergent pedagogical space is explored through an applied case study from a design and technology context.  相似文献   

Actuator fault diagnosis for a class of bilinear systems with uncertainty   总被引：1，自引：0，他引：1  

Bin Jiang  Jian Liang Wang 《Journal of The Franklin Institute》2002,339(3):361-374

In this paper, the actuator fault diagnosis problem for a class of bilinear systems with uncertainty is discussed. The system is transformed into two different subsystems. One is not affected by actuator fault, so an adaptive observer can be designed such that, under certain conditions, the observer error dynamics is stable. The other whose states can be measured is affected by the faults. The observation scheme is then used for model-based fault diagnosis. Finally, an example of a semiactive suspension system is used to illustrate the applicability of the proposed method.  相似文献   

Supporting adaptive learning pathways through the use of learning analytics: developments,challenges and future opportunities     

Anna Mavroudi  Michail Giannakos  John Krogstie 《Interactive Learning Environments》2018,26(2):206-220

Learning Analytics (LA) and adaptive learning are inextricably linked since they both foster technology-supported learner-centred education. This study identifies developments focusing on their interplay and emphasises insufficiently investigated directions which display a higher innovation potential. Twenty-one peer-reviewed studies are identified via a systematic review and classified based on the dimensions of a proposed framework. The findings of the review suggest that interesting work has been carried out during the last years on the topic. We conclude with a need for more research on the topic in specific learning domains and settings. Recommendations include: a clear strategy for adaptation augmented by LA, the combination of on-task with pre-task measures, and the combination of system-controlled adaptation with user-controlled adaptation. Future trends include the emergence of constructivist-collaborative environments that provide insightful models of complex student behaviour.  相似文献   

An adaptive fuzzy filter for coding artifacts removal in video and image     

WU Jing YE Xiu-qing GU Wei-kang 《浙江大学学报(A卷英文版)》2007,8(6):841-848

This paper proposes a new adaptive post-filtering algorithm to remove coding artifacts in block-based video coder. The proposed method concentrates on blocking and ringing artifacts removal. For de-blocking, the blocking strength is identified to determine the filtering range, and the maximum quantization parameter of the image is used to adapt the 1D fuzzy filter. For de-ringing, besides the edge detection, a complementary ringing detection method is proposed to locate the neglected ringing blocks, and the gradient threshold is adopted to adjust the parameter of 2D fuzzy filter. Experiments are performed on the MPEG-4 sequences. Compared with other methods, the proposed one achieves better detail preservation and artifacts removal performance with lower computational cost.  相似文献   

Finite element simulation of stress intensity factors in elastic-plastic crack growth     

ALSHOAIBI Abdulnaser M. ARIFFIN Ahmad Kamal 《浙江大学学报(A卷英文版)》2006,7(8):1336-1342

INTRODUCTION The finite element method (FEM) has been widely employed for solving linear elastic and elas-tic-plastic fracture problems. The evaluation of stress intensity factors in 2D geometries by FEM is a tech-nique widely used for non-standard crack configura-tions. Basically, there are two groups of estimation methods, those based on field extrapolation near the crack tip (Chan et al., 1970; Shih et al., 1976) and those using the energy release when the crack propagates. However…  相似文献   

适应行为研究的新理论——社会性能力理论   总被引：3，自引：0，他引：3  

刘洪沛 《中国特殊教育》2003,100(1):60-64

随着智力落后儿童教育研究的发展,适应行为的研究已经成为研究 者们关注的一个重要问题。但是,长期以来有关适应行为的研究一直存在争 论。本文将介绍美国心理学家格林斯潘的一个适应行为研究的新理论—— 社会性能力理论的内容、发展以及其的意义。以期对我国智力落后儿童的适 应行为研究有所借鉴。  相似文献   

网上考试系统的设计与实现   总被引：1，自引：0，他引：1  

张瑛  黄英杰 《淮南职业技术学院学报》2003,3(4):97-100

考试系统是网上学习环境的重要组成部分。介绍计算机化自适应考试(Computerize Adaptive Test)的基本理论依据和实施过程，构建了设计题库的数据模型并提出一个基于Web的自适应考试系统框架结构，分别阐述了检索编辑模块、成绩管理模块、组卷模块、统计分析模块、辅助模块、试卷输出处理模块等考试系统六大模块的开发，特别是手动组卷模块功能的设计和实现。  相似文献