大学生信息消费心理及行为分析   总被引：6，自引：1，他引：5  

张金凤  翟江  李志忠 《河北科技图苑》2005,18(1):53-55

根据调查数据分析了在校大学生的信息需求、信息动力、信息动机、信息行为等信息消费问题;同时对大学生、学校和信息供应商的各自行为提出了一些意见和建议。  相似文献   

大学之用     

蒋国华 《当代教育论坛》2004,(3):1-1

应邀参加北京大学、北京师范大学等部分高校研究专家发起的关于大学理念的学术沙龙,既感到高兴又觉得有一种责任。随着大学的作用在当代社会中的扩展、转折或提升,随着政府对大学的重视、资助和随之而至的对其要求的提高,也由于上述两方面的变化速度远远超出了人们,包括研究高校的学者内在的思想和认识的程度,于是,历史就又常常重  相似文献   

我国教育经费不足的微观经济分析     

吴克明  江风茂 《当代教育论坛》2004,(9):27-28

本文运用经济人假设分别从供给和需求两方面探析教育经费不足的微观原因。由于教育经费的供给主体和需求主体都是经济人,为了实现个人利益最大化,教育经费的供给主体往往不愿意加大教育投入,而需求主体则力图扩张教育经费需求,由此导致教育经费不足。  相似文献   

把基础实验室评估作为"211工程"建设的基础     

秦钢年  王东恩  江业健 《高教论坛》2004,(2):15-17

本文介绍了如何把基础实验室评估纳入学校的中心工作,实现实验室评估与学校中心工作的双向促动;并从体制改革、环境整改、软件建设、设备管理、专家组作用等几个方面论述了如何搞好评估准备工作。  相似文献   

发展哲学视野中的马克思     

孙江 《常熟理工学院学报》2004,18(1):5-7,60

发展是当代世界主题之一,更是当代中国社会历史演进的主旋律.用"从后思索"的研究方法来审视当年马克思给我们留下的历史文本,我们可以看出马克思在当年考察资本全球化时期所提出的发展思想依然具有一定的现实意义.这些思想在时代的包装下演化成应用性部门哲学--发展哲学.马克思的发展哲学思想可以概括为发展主体的人文关怀、交往实践辩证法、发展问题的哲学解决方案三个方面.  相似文献   

往事值得回首     

江乃武 《大学图书馆学报》2004,22(4):10-11

<正> 这20年是文献检索课从无到有,由小而大的一段发展历程。这当中的一些事,今天回想起来仍然很有意思,谨就记忆所及,略述一二。 两条经验 改革开放的号角,催动了各项事业蓬勃发展,用户信息需求也随之迅速增长。但是,他们当中大部分人的利用信息能力与其需求颇不相称,这是当时一个甚为突出的矛盾。身临生产、科研第一线的用户,急切地要求补上这一课。从长远看,培养大学生的这方面能力尤为迫切。解决这一问题,于深化个人治学,于发展生产科研,都有其一定的意义。  相似文献   

State and unknown input estimations for discrete-time switched linear systems with average dwell time     

Shenghui Guo  Bin Jiang  Fanglai Zhu  Qingbin Gao 《Journal of The Franklin Institute》2019,356(18):11741-11759

In this paper, the problem of state and unknown input estimations for a class of discrete-time switched linear systems with average dwell time switching is investigated. First, a proportional integral observer with an exponential H_∞ performance is constructed to estimate the system state and unknown input simultaneously. Second, both of the observability and the stability of the estimation error system are analyzed, then the derivation of the observer gain matrices is transformed into the calculation of linear matrix inequalities. Third, the obtained results are extended to the systems with output disturbances. Finally, two simulation examples are provided to show the validity and effectiveness of the proposed methods.  相似文献   

Fault-tolerant control for a class of linear interconnected hyperbolic systems by boundary feedback     

Yongyuan Xu  Hao Yang  Bin Jiang 《Journal of The Franklin Institute》2019,356(11):5630-5651

This paper considers a fault-tolerant control problem for a class of interconnected linear hyperbolic partial differential equation systems. Both subsystem faults and coupling faults are considered. Firstly, the well-posedness of the faulty system is analyzed by using semigroup theory. Secondly, for the fault-free case, a stabilizing boundary feedback control based on small-gain theorem is proposed. Consequently, in the presence of faults, fault recoverability conditions are established that maintain the stability of the faulty systems. The fault-tolerant control strategies are also provided. A heat exchanger example is taken to illustrate the effectiveness and practicality of the proposed methods.  相似文献   

Novel integral sliding mode control for small-scale unmanned helicopters   总被引：1，自引：0，他引：1  

Tao Jiang  Defu Lin  Tao Song 《Journal of The Franklin Institute》2019,356(5):2668-2689

Integral sliding mode (ISM) control which consists of a nominal control and a sliding-mode motion control, provides a nice framework for high tracking performance and good disturbance reduction. Our work develops ISM to attenuate the adverse effect of mismatched perturbations. By properly choosing sliding-manifold surface, the elimination of disturbances on control outputs enables to be achieved. Additionally, the chattering of sliding-mode control part is attenuated based on second-order sliding mode idea. Then, the proposed novel ISM control scheme is applied to address trajectory tracking problem for helicopters under perturbations. Approximated input-output linearization is implemented, such that the obtained linearized model is suitable for applying the proposed ism control. The stability of the closed-loop system for helicopter and its convergence to zeros of tracking errors are demonstrated by Lyapunov theory analysis. Several comparison simulations illustrate the effectiveness and superiority of the proposed methods.  相似文献   

Dynamics of a stochastic multigroup SIQR epidemic model with standard incidence rates     

Qun Liu  Daqing Jiang  Tasawar Hayat  Ahmed Alsaedi 《Journal of The Franklin Institute》2019,356(5):2960-2993

In this paper, we consider a stochastic multigroup SIQR epidemic model with standard incidence rates. By using the stochastic Lyapunov function method, we establish sufficient conditions for the existence of a stationary distribution of the positive solutions to the model. Then we establish sufficient conditions for extinction of the diseases. A stationary distribution means that all the individuals can be coexistent and persistent in the long term. Finally, some examples and numerical simulations are introduced to illustrate our theoretical results.  相似文献