农村人口流动的经济体制背景     

刘军荣  文中发 《宜宾学院学报》2004,4(5):79-83

我国农村流动人口规模巨大,与我国的经济制度和城乡及地区经济级差的关系极为深刻.农村经济体制改革、商品经济的提出和市场经济体制的建立为农村剩余劳动力的流动提供了体制上的契机,而城乡和地区经济级差为农村剩余劳动力提供了流动的方向.  相似文献   

低渗透非达西渗流动边界模型理论解的几个命题     

胡其华  殷勤 《宜宾学院学报》2007,7(12):18-20

建立了低渗透非达西渗流带Stefan条件的动边界模型并且将动边界问题理论解的存在性转化为某一积分变换的不动点问题;然后提出几个重要命题,最后利用不动点定理和极值原理进行证明,这几个命题为证明模型理论解的存在惟一性,并进一步讨论模型数值解奠定了基础.  相似文献   

高校创建“运动处方”指导中心的可行性研究     

高向文 《鞍山师范学院学报》2007,9(2):86-88

高校建立"运动处方"指导中心,客观上实现了"运动处方"理论与实践应用的紧密结合.给学生科学、合理的指导,使学生能够更深入地认识健身、健心要走科学的道路,避免学生盲目、随意的从事体育活动。收不到良好的效果.此外,通过评价学生的健身效果,不断调整"运动处方",也丰富了该学科的理论,总结了更实际的案例.因此,在高校创建"运动处方"指导中心是必要的、可行的.  相似文献   

异常流量短信分析监控系统的设计与实现     

雷鸣 《广东轻工职业技术学院学报》2008,7(4):5-6

针对移动通信业务中短信的应用中,大量的非法短信、垃圾短信的传播对社会安定和用户情绪有着较大的影响。为了提高GSM的网络安全,本文介绍一种通过监控A口的网络信息,从而实现对本地用户和外地用户的短信流量以及短信内容进行监控的系统。  相似文献   

Concept image revisited     

Erhan Bingolbali  John Monaghan 《Educational Studies in Mathematics》2008,68(1):19-35

Concept image and concept definition is an important construct in mathematics education. Its use, however, has been limited to cognitive studies. This article revisits concept image in the context of research on undergraduate students’ understanding of the derivative which regards the context of learning as paramount. The literature, mainly on concept image and concept definition, is considered before outlining the research study, the calculus courses and results which inform considerations of concept image. Section 6 addresses three themes: students’ developing concept images of the derivative; the relationship between teaching and students’ developing concept images; students’ developing concept images and their departmental affiliation. The conclusion states that studies of undergraduates’ concept images should not ignore their departmental affiliations. Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users.  相似文献   

最大流算法及其应用     

张永军 《中国科技信息》2007,(24):322-324

本文介绍了图论中最大流问题的算法，并且讨论Ford—Fulkerson等算法在解决实际问题中的应用。  相似文献   

Phenotypic and functional characteristics of dendritic cells derived from human peripheral blood monocytes   总被引：4，自引：0，他引：4  

汤灵玲  张哲  郑杰胜  盛吉芳  刘克洲 《Journal of Zhejiang University. Science. B》2005,6(12):1176-1181

INTRODUCTION Dendritic cells(DCs)are professional anti-gen-presenting cells(APC)that are responsible for the activation of undifferentiated T cells and the generation of primary T-cell responses(Cella et al.,1997).The specific role of DCs is to capture,process and present antigens to T cells.Immunogenic and inflammatory signals are responsible for the migra-tion of DCs from tissues to lymphoid organs where they initiate an immune response.These processes induce the maturation of DCs…  相似文献   

多媒体远程教学系统中连续媒体实时传输问题的研究     

尹浩  朱光喜 《现代远程教育研究》2002,(1):52-55

本就多媒体远程教学系统中连续媒体实时传输问题进行了分析，着重对流化技术进行了深入的探讨。根据网络教学的需要，以Microsoft的Media Server Service为内核，设计了一个应用于Internet的多媒体远程教育系统，对其中的连续多媒体流实时传输系统的设计进行了全面的介绍，并通过模拟试验的数据，对系统的性能进行了评价。  相似文献   

A flow and routing control policy for communication networks with multiple competitive users     

Ismet Sahin 《Journal of The Franklin Institute》2006,343(2):168-180

This paper is concerned with deriving an optimal flow and routing control policy for two-node parallel link communication networks with multiple competing users. The model assumes that each user has a flow demand which needs to be optimally selected and routed on the network links. The flow and routing control policy for each user seeks to maximize the user's total throughput and minimize its expected delay. To derive such a policy, we consider a utility function for each user that combines these two objectives in an additive fashion with preference constants that can be adjusted to reflect the user's own preferences between maximizing throughput and minimizing delay. Additionally, we provide each user with the ability to make these preferences link-dependent to reflect the user's preferences for certain links over others in the network. A condition that depends on the link capacities and preference constants is derived to guarantee the existence and uniqueness of a non-symmetric flow and routing control policy solution which satisfies the Nash equilibrium of non-cooperative game theory. The Nash equilibrium is a desirable solution for such networks because it insures that no user can improve its utility by unilaterally deviating from its Nash control policy. We discuss in detail several interesting properties of this equilibrium and in particular, its relationship to the users’ preference constants. Two illustrative examples are also presented.  相似文献   

信息时代企业组织单位的设计   总被引：1，自引：0，他引：1  

杨勇  束军意 《科研管理》2004,25(3):72-76

本论文根据顾客需求的复杂性和企业产品技术的复杂性，将信息时代企业内的组织单位——过程团队分成职能过程团队、产品过程团队、项目团队、业务员等四种类型，深入分析了这四种过程团队的特点、适用条件及其建立的前提条件。最后，总结出信息时代企业组织结构的模式。  相似文献