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1.
俄罗斯采取综合措施,以战略为先导,以立法为基础,以机制为保障,以双向为特征,以管疏为手段,以合作为补充,以教育为基本,坚持“数码主权”,全方位管理网络空间在电视和网络之间,接近半数俄网民更相信互联网消息,致使社会民众和政府之间的鸿沟扩大到危险程度。普京认为:  相似文献   

2.
《计算机网络世界》2004,13(2):61-61,67
我们可以以思科三层服务体系为例。思科客户服务体系以工程技术人员、处理流程、运用工具,以及合作伙伴四大部件为支撑,依据服务升级,分成三个金字塔层次,底层为技术支持服务层,它以设备为主要技术支持对象,确保用户设备投资得到保障。中间层为高级服务层,它的主要支持对象为网络,为用户  相似文献   

3.
《大众软件》2010,(19):74-75
初入大荒,盘古开天辟地,清气上浮为天,浊气下沉为地。清气分为两支,西华至妙之气化为昆仑,昆仑之主神为西王母;东华至玄之气化为东海,东海之主神为帝俊。浊气亦分为两支,北极至恶之气化为幽都,幽都本无主,自颛顼去后自称幽都王,始有首领。南极至善之气化为世间生灵,大荒世界自此成形。  相似文献   

4.
《个人电脑》2003,9(9):186-186
JNC SSF-70两侧和底部为紫色,而顶部为银色,配合长方体的外形设计,使得整体感觉非常简洁明快,JNC SSF-70内存容量为128MB,采用内置380毫安电池,通过USB接口就可以为其充电,充电时间为3小时左右,标称使用时间为10小时。如果你经常出差.还可以购买一个专用充电器,尽管使用了内置锂电池,JNC SSF-70  相似文献   

5.
多媒体具有直观形象、化大为小,化远为近,化虚为实,化静为动,化抽象为具体,化宏观为微观,改变时空、动静变化、快慢可调、重复再现功能的特点,通过多媒体综合配套,利用因特网、多媒体等多种现代设备的全方位结合.充分发挥教师对多媒体技术的创造力,边用边改,在使用中创新,教师、学生、多媒体技术三位一体,达到提高教学效果和学生素质的目的。  相似文献   

6.
建立适应市场需要的新型电力营销理念,以可持续发展为前提,以需求预测管理为基础,以用户需求为导向,以优质服务为宗旨,以满足用户需求、引导用户消费为中心,随时随地为用户提供质优、价廉的清洁能源,适应商业化运营、法制化管理,分层高效运作,功能齐备,是电网企业核心业务---营销管理工作的当前之急。  相似文献   

7.
《计算机与网络》2008,34(16):4-4
第二季全球PC出货量排名近日出炉,最新报告显示,惠普第二季度仍称霸全球PC市场,份额为18.1%;戴尔位居第二,市场份额为15.6%,宏基第三,市场份额为9.4%;联想第四,市场份额为7.8%;东芝第五,市场份额为4.4%。尽管戴尔依然落后于惠普,但差距却在缩小。  相似文献   

8.
1999年,国内电子信息产品市场对元器件的需求约为1920亿只左右。其中电容器约为802亿只,电阻电位器约为740亿只,各种接插件为135亿只,电感器和磁性器件约为165亿只,电声器件约为7亿只,继电器约为2亿只,频率元件26亿只左右。1999年国内市场对元器件需求预测...  相似文献   

9.
陈先 《网络与信息》1998,12(6):9-10
国家经济信息系统发展过程中,在业务方向的选择方面,是随着形势发展的需要不断调整的。现在提出强化双向服务,既要强化为政府宏观调控服务,又要大踏步走向市场,为企业为社会服务。在实践中,无论是强化为政府服务,还是强化为市场服务,都离不开全系统的联合和协作。...  相似文献   

10.
截止到2004年9月,中国打印机市场销售总量为4210万台,与2003年同期相比,增长率为198%。其中喷墨打印机占与整体市场比重为70.4%%,激光打印机占整体市场比重为18.2%,针式打印机占整体市场比重为11.0%,  相似文献   

11.
在实际应用中有这样一类关系数据库,其中数据项在某个属性上的取值本身又是一个关系。讨论这种混合关系中的函数依赖及其相应的相关规则具有一定的理论意义和实际应用价值。给出这种混合关系的形式定义、混合关系中4种类型的函数依赖关系以及相应的4种类型的相关规则;并给出混合关系到一般关系的转换,通过这个转换说明了混合关系与普通关系的联系及其差别。给出一个实际应用中的例子,来说明混合关系中的函数依赖和相关规则的形式多样性。  相似文献   

12.
The PEMS high speed maglev train, which features a permanent magnet inside an electromagnet, is a new kind of maglev train for long distance intercity transportation. The joint structure, which consists of two single levitation sub‐systems, is the fundamental levitation unit. Two kinds of faults are considered and corresponding fault tolerant control strategies are proposed. The first fault condition is when a gap sensor that is part of a single levitation system is faulty. For this kind of fault, a fault tolerant control strategy based on signal reconfiguration is proposed. The second fault condition is when the whole of a single levitation sub‐system is faulty. Under this condition, a faulty model is firstly established, then a fault tolerant control strategy is designed. When this kind of fault is detected, a switch from the normal controller to the fault tolerant controller can make the faulty system stable.  相似文献   

13.
文中介绍了一种系统级故障诊断模型--通用比较模型,该模型处理器作为自身的比较器,综合经典的PMC模型和Maeng/Malek模型的优点,基于该报多处理器系统的t_可诊断性问题,给出了t_可诊断系统的特征化,证明了一个系统成为t-可诊断系统的新的充分必要条件,其次,证明在通用比较模型中,确定故障顺集的问题等价于求解一个超图的最小横切集(Minimum traversal),该超图是根据多处理器的通信  相似文献   

14.
给出了vague集转换为模糊集的一种新的方法,定义了vague集的模糊逼近。利用vague集的模糊逼近研究了vague集的模糊熵及其相关性质。  相似文献   

15.
Uncertainty is an attribute of information. The path-breaking work of Shannon has led to a universal acceptance of the thesis that information is statistical in nature. Concomitantly, existing theories of uncertainty are based on probability theory. The generalized theory of uncertainty (GTU) departs from existing theories in essential ways. First, the thesis that information is statistical in nature is replaced by a much more general thesis that information is a generalized constraint, with statistical uncertainty being a special, albeit important case. Equating information to a generalized constraint is the fundamental thesis of GTU. Second, bivalence is abandoned throughout GTU, and the foundation of GTU is shifted from bivalent logic to fuzzy logic. As a consequence, in GTU everything is or is allowed to be a matter of degree or, equivalently, fuzzy. Concomitantly, all variables are, or are allowed to be granular, with a granule being a clump of values drawn together by a generalized constraint. And third, one of the principal objectives of GTU is achievement of NL-capability, that is, the capability to operate on information described in natural language. NL-capability has high importance because much of human knowledge, including knowledge about probabilities, is described in natural language. NL-capability is the focus of attention in the present paper. The centerpiece of GTU is the concept of a generalized constraint. The concept of a generalized constraint is motivated by the fact that most real-world constraints are elastic rather than rigid, and have a complex structure even when simple in appearance. The paper concludes with examples of computation with uncertain information described in natural language.  相似文献   

16.
工程上经常碰到非线性曲线辨识问题。本文探讨一种非线性极大似然-优化法并结合三次样条函数拟配法,形成统一的逐次逼近的直接辨识非线性曲线的非线性辨识方法。该法兼有极大似然法的唯一性、很好的收敛性和优化法直接处理非线性系统的能力,辨识出的样条函数曲线能无限地光滑地逼近非线性曲线。  相似文献   

17.
The essence of intelligence is to use certain abilities to obtain knowledge, to use that knowledge, and to operate with that knowledge. New knowledge learned by a human is often related to old existing knowledge, and sometimes we could have more conceptual knowledge based on old knowledge. So, the knowledge in the brain exists in a related structural form, and this structure is dynamic, and therefore is evolvable. Based on the understanding of the real process of learning by a human being, we discuss how to make a model to describe the dynamic structure of knowledge. This model is also a principle of artificial brain design. Most of the knowledge a child learns is from natural language and perception information, and we define this as semantic knowledge. The model to describe the process and structure of knowledge growing in a network form is called a K-net. It is a dynamic network with two main dynamics: one is new knowledge added, and the other is aggregating knowledge existing in the network with some probability. Under these very natural conditions, we found that the network is originally a simple random net, and then some characteristics of a complex network gradually appear when more new knowledge is added and aggregated. A more interesting phenomenon is the appearance of a random hierarchical structure. Does this mean emergence?  相似文献   

18.
This paper proposes a distributed self-healing architecture which contains two self-healing techniques. In this proposal, a path restoration by Self-Healing Ring (SHR) and a path restoration by Dynamic Self-Healing (DSH) algorithm are jointly applied in a network. In the architecture, SHR is applied for a part of a path which is terminated by an Add-Drop Multiplexer (ADM), and DSH is applied for another part of a path which is terminated by two Digital Cross-Connect Systems (DCSs). Based on the architecture, DSH can be applied for a part of a path which is terminated by an ADM. Next, a network design algorithm is described in order to optimize the amount of spare capacity. As a result, spare capacity reduction is realized by using the algorithm for a network where the proposed architecture is applied.  相似文献   

19.
用户管理系统是Web应用系统及大型软件系统的重要组成部分。在目前已有的用户管理系统中,角色只是权限的集合,不涉及管辖范围,是一个一维空间上的概念。该文提出一种二维角色的概念,是由权限和范围组成的二元对集合,是一个二维空间上的概念。构建一个基于二维角色的通用用户管理模型,设计一个通用用户管理系统,能满足现代Web应用系统和大型软件系统对用户授权的多层次和多空间的要求。  相似文献   

20.
引入BL-代数的n-重模糊蕴涵滤子概念,讨论了n-重模糊蕴涵滤子的性质,给出若干等价刻画,给出了验证n-重模糊蕴涵滤子的一个简单条件。用n-重模糊蕴涵滤子对n-重蕴涵BL-代数进行了刻画,证明了一个模糊滤子是一个n-重模糊蕴涵滤子当且仅当对应的商代数是一个n-重蕴涵BL-代数。  相似文献   

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