Suboptimal reliable guaranteed cost control for continuous-time systems with multi-criterion constraints

The suboptimal reliable guaranteed cost control （RGCC） with multi-criterion constraints is investigated for a class of uncertain continuous-time systems with sensor faults. A fauk model in sensors, which considers outage or partial degradation of sensors, is adopted. The influence of the disturbance on the quadratic stability of the closed-loop systems is analyzed. The reliable state-feedback controller is developed by a linear matrix inequalities （LMIs） approach, to minimize the upper bound of a quadratic cost fimction under the conditions that all the closed-loop poles be placed in a specified disk, and that the prescribed level of H∞ disturbance attenuation and the upper bound constraints of control inputs＇ magnitudes be guaranteed. Thus, with the above muki-criterion constraints, the resulting closed-loop system can provide satisfactory stability, transient property, a disturbance rejection level and minimized quadratic cost performance despite possible sensor faults.     

New academics,new higher education contexts: a critical perspective on professional development

New academics entering higher education are especially vulnerable if teaching in a post-colonial classroom is not foregrounded as an explicit part of their professional induction. Drawing on a study of a professional development programme for induction to teaching, this paper explicates how six new academics confront specific challenges of exclusion, marginalisation, and alienation at institutional, faculty, departmental and classroom levels. Framed by critical and social realist theory, the study uses photo voice methodology to elicit new academics' critical insights in the ‘learning to teach’ frame. The paper asserts new academics must engage in ways that make explicit the racial, gendered and class-based constraints experienced in various university spaces. While the relevance and legitimacy of current professional development programmes depends on their ability to be responsive and socially just, the study also questions whether programmes alone can challenge deep systemic constraints that are reproduced through current university structures and culture.     

Allocating Sample Sizes to Reduce Budget for Fixed-Effect 2×2 Heterogeneous Analysis of Variance

This article discusses the sample size requirements for the interaction, row, and column effects, respectively, by forming a linear contrast for a 2×2 factorial design for fixed-effects heterogeneous analysis of variance. The proposed method uses the Welch t test and its corresponding degrees of freedom to calculate the final sample size in a 2-step procedure. The simulation results show that the proposed sample size allocation ratio can minimize the sampling cost, while at the same time the designated power is achieved. The article concludes with a discussion to reiterate the importance of sample size planning, especially for testing the iteration effect.     

修辞批评的价值和意义

修辞批评作为文学批评最重要的一种形式,它在当代的复兴,对文学批评实践具有重要的理论价值和意义,这可以从两方面看：一是从西方现代修辞批评角度看,对修辞本性的哲学反思,将修辞看成是一种话语实践,看成是对真理的认识和表现,有助于人们重新认识文学和文学性问题;另一方面则可以从修辞批评与中国古代文学理论关系看,认识到中国古代文学理论更靠近修辞批评这一特色,以更好地发掘中国古代文学理论的价值。     

城市社区养老模式初探——基于结构功能主义视野下的分析

我国人口结构转向老龄化,同时社会转型带来了家庭养老功能不断弱化,老年人的养老成为一个显著的社会问题。本文试图从结构分化、功能替代和结构性制约这一结构功能主义的视角来探讨当前我国城市社区养老发展的必然性并探寻这一新型养老模式的发展思路。     

融资约束、税收激励与企业研发投入——来自中国制造业上市公司的证据

以中国制造业上市公司2011—2013年的数据为样本,研究融资约束与税收激励2个因素对企业研发投入的影响。研究发现,融资约束显著影响企业研发投入强度,民营企业研发投入主要依赖于债务融资,国有企业的研发投入主要取决于股权融资;税收政策对企业研发投入的激励效应主要体现在民营企业,对国有企业研发投入的促进作用不显著;税收激励效应有效缓解了融资对民营企业研发投入的影响,企业所得税税收政策较增值税更能促进民营企业的研发投入。     

融资约束背景下的企业研发投入与新产品开发绩效——基于中国工业企业数据库的面板模型分析

以往研究对于企业研发投入强度与新产品开发绩效之间的互动关系存在着正向影响与负向影响的不同结论,原因之一在于未考虑融资约束等情境因素的影响。从融资约束的视角研究企业研发投入强度与新产品开发绩效之间的影响关系,基于构建面板回归模型的方法和中国工业企业数据,实证结果表明:(1)进一步验证了研发投入强度与新产品开发绩效之间的正向关系的存在;(2)研发投入强度与新产品开发绩效存在着非线性倒U型关系;(3)检验了融资约束存在的调节效应,内部融资约束与外部融资约束对于上述关系的影响不同。研究结果可以为企业、政府和金融机构共同促进形成新产品研究提供理论与政策指引。     

修辞话语建构：自觉和不自觉

既定的修辞理论对修辞的定义，预设了修辞只能是自觉的行为，这在理论上不严密，在实践上更容易出问题。符合语言事实的说法应该是：修辞话语建构包括自觉行为和不自觉行为，同时存在着不自觉和自觉的分离、交叉和转化的复杂形态。     

儿童词汇习得:社会语用认知的发展过程——儿童词汇习得理论假设评述

有关儿童习得词汇的研究主要有三种理论假设 :联想学习理论、制约原则论和社会语用理论。本文在分析前两种词汇习得理论缺陷的基础上 ,着重对社会语用认知理论进行了评述。该理论强调 ,具有可塑性的、强有力的社会认知技能是儿童成功习得词汇的关键因素     

约束非线性l1问题的极大熵方法

本文给出求解约束非线性l1问题的极大熵方法并证明了其收敛性。给出了极大熵与增广La grange乘子法相结合的算法 ,最后给出一个算例。