Mixed control of uncertain jumping time-delay systems     

Magdi S. Mahmoud  Fouad M. AL-Sunni  Yan Shi   《Journal of The Franklin Institute》2008,345(5):536-552

In this paper, we investigate a class of linear continuous-time systems with Markovian jump parameters. An integral part of the system dynamics is a delayed state with time-varying and bounded delays. The jumping parameters are modeled as a continuous-time, discrete-state Markov process. Employing norm-bounded parametric uncertainties and utilizing the second-method of Lyapunov, we examine the problem of designing a mixed controller which minimizes a quadratic performance measure while satisfying a prescribed -norm bound on the closed-loop system. It is established that sufficient conditions for the existence of the mixed controller and the associated performance upper bound could be cast in the form of linear matrix inequalities.  相似文献   

对于概率中样本空间的两点注释     

蔡敏 《中国科技信息》2007,(23):153-153,156

从古典概型中事件概率的计算和事件的独立性两方面,通过举例较深入地分析了样本空间选取的重要性,并指出在概率计算中要充分利用概率概念。  相似文献   

论我国企业实施知识管理的问题与策略   总被引：5，自引：0，他引：5  

李朝明 《情报科学》2002,20(11):1132-1136

本文在研究企业知识管理模式及其在国外实施的成功经验基础上，从企业组织结构重组、网络基础设施建设和社会经济文化环境建设等方面，分析了我国企业在实施知识管理中存在的主要问题，并探讨了解决问题的主要策略。  相似文献   

文化创意产业发展的信息技术分析   总被引：6，自引：0，他引：6  

邬凌云  江蕊 《技术与创新管理》2006,27(3):81-83

新世纪以来,全球文化创意产业蜂拥而起,中国的文化创意理念也隆重而强有力地推出。同时从发展因素看,信息技术对文化创意产业起着巨大的推动作用。因为它对传统文化资源的再创造一方面增加了传统产业的文化附加值,另一方面也调整了现代文化产业的发展方向,对于优化产业结构和促进经济增长有着重要的战略意义。  相似文献   

安阳市洹河景观规划设计之探析     

张莉  王斐  张跃峰 《安阳工学院学报》2005,(6):27-30

依托河流所构建的城市,在其景观规划设计中应正确理解城市河流的个性,综合考虑以河流景观开发的相邻区域与构成城市空间的所有要素,把自然、历史和文化特征融合到滨水景观设计环节中,最终把城市设计成一个富有生命的滨水景观城市.  相似文献   

文化全球化的历史根源之初探     

李理 《安阳工学院学报》2005,(5):91-93

作为象征体系与物质体系之结合体的文化,不仅是精神、意义领域的一种社会交往行为,还同时表现为深受政治、经济、技术之制约的社会问题.因而,从历史的角度,通过解析特定的技术逻辑、经济逻辑、政治逻辑在形成现有文化全球化格局的过程中所起的决定性作用,可以揭示出文化全球化所蕴涵的意义及其对人类社会的影响.  相似文献   

The multi-paradigmatic character of contemporary educational action research: a promising perspective or an underlying threat?     

Eleni Katsarou 《Educational Action Research》2017,25(5):673-686

From the very first moment action research started to be used in the social research field until now, it has presented significant variations. Action research looks like a mosaic of theoretical and methodological approaches, named differently from time to time and/or from place to place: for example, practitioner inquiry, practitioner research, teacher research, participatory action research, and so forth. The basic aims of this article are to find the reasons for this and to discuss the implications of the phenomenon. Starting with the first issue, we could ask ourselves: why do we today find so many and considerable variations in action research approaches in the literature? The evident reason is because action research draws upon many theoretical paradigms that – in some circumstances – are not only different, but also contradict each other. Hammersley states characteristically that action research draws upon positivism, pragmatism, hermeneutics, critical theory and postmodernism! After such claims, we can easily wonder: how can such a multi-paradigmatic approach compose cohesive methodological proposals? We can also pose another crucial question: although we can easily understand that this multi-paradigmatic nature is a real advantage which gives action research a pluralistic essence, is it really ‘a strong indicator of the power of action research to reinvent itself according to local needs’ as Somekh stated, or might it at the same time conceal serious risks?  相似文献   

A dynamic learning concept in early years’ education: a possible way to prevent schoolification     

Stig Broström 《International Journal of Early Years Education》2017,25(1):3-15

In early childhood education and care, Nordic social pedagogy approach is challenged by a learning orientation that often results in unproductive ‘either/or’ thinking. Therefore, based on the two approaches and by analysing several dimensions of Froebel’s ideas and prevailing social-historical activity (play) theory, the author deduces four generally accepted play criteria that form the basis for the construction of a dynamic and play-based learning concept that has the three following cornerstones as focal points: (1) learning happens in activities where the child is an active participant and interacts and communicates with other people; (2) meaningful activities pave the way for children’s learning; these are activities where the child’s motive aligns with the goal of the activity; and (3) learning is seen as a productive and creative activity characterised by imagination.  相似文献   

Teaching critical thinking: Cultural challenges and strategies in Singapore          下载免费PDF全文

Charlene Tan 《British Educational Research Journal》2017,43(5):988-1002

Among the challenges faced by educators in promoting critical thinking is that of cultural compatibility. Using Singapore as an illustrative case study, this paper explores the cultural challenges and recommended strategies for the teaching of critical thinking in schools. The research for this study is based on a theoretical framework that focuses on two dominant practices of critical thinking: confrontational and individualistic on the one hand, and collegial and communal on the other. Research data shows that the main cultural challenges are the social expectations of teachers as knowledge transmitters and a perception that critical thinking is essentially adversarial. The recommended strategies are the utilisation of cooperative learning strategies and the provision of a safe learning environment. There are two major implications arising from this research study. The first is a need for policymakers and educators to be cognisant of cultural constraints in the teaching of critical thinking. The second is the significance of teacher efficacy to engender student engagement and successful learning within socio‐cultural constraints. The Singapore experience adds to the existing literature by highlighting the existence and significance of communitarian practices of critical thinking in an Asian context.  相似文献   

“Gymnasts Are Like Wine,They Get Better With Age”: Becoming and Developing Adult Women’s Artistic Gymnasts     

Natalie Barker-Ruchti  Roslyn Kerr  Astrid Schubring  Georgia Cervin  Myrian Nunomura 《Quest (Human Kinetics)》2017,69(3):348-365

Women’s artistic gymnastics is commonly understood to require early entrance and intense training during childhood. Most gymnasts retire before reaching adulthood. In recent years, the gymnast population at the highest level has “aged.” In this article, we adopt a socio-pedagogical perspective to explore the training contexts, pubertal development, and associated learning 10 older elite gymnasts reported. We develop a cultural perspective of gymnast development and show that transitioning through puberty allowed the gymnasts to extend their careers. Support from their coaches and parents, self-reflective time, and genetic predispositions facilitated the transitioning. Through this, gymnasts gained control over self, body, relationships, and performance. In conclusion, we provide implications for gymnast development practice.  相似文献