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现在的摄像头便宜了,身边的朋友几乎都人手一个的,晚上上QQ的时候,大家都双双开视频,还真够热闹了。可是过了一阵子以后,新鲜感过去了,大家都比较情愿把网络的带宽用在下载上了,摄像头用的机会就少了,甚至干脆就卸下来放到抽屉去了。慢慢的,系统新装和删除的东西都多了,已经安装的驱动程序相信早就删去了,而附带的驱动程序光盘,也早就不知道丢哪里去了,当某天忽然又想起这个几乎要被遗忘的摄像头时,重新使用之前,还真的免不了要为驱动程序而发愁。 相似文献
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在分析了临界路径跟踪法优缺点的基础上,对其进行改进,提出了伪临界路径跟踪法,把伪临界路径跟踪法和并行模拟法结合起来,用于时序电路的故障模拟,大大地减少了待模拟的故障事件数,降低了模拟时间,节省了内存,在文末,给出了软件实现的结果。 相似文献
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本文是继1999年以来,第4篇多媒体技术研究文献综述,该文查阅了2001年国内9种核心刊物的2472篇文章,从中选取了394篇与多媒体技术相关的文章,进行了分类,统计,并同1998,1999,2000年的统计结果做了比较,总结了2001年多媒体技术研究的状况,指出了多媒体技术的研究热点,并展望了今后多媒体技术的发展趋势,不仅为从事多媒体技术研究和应用的人员提供了很好的资料索引 ,也给论文作者和刊物编辑以一个很好的参考。 相似文献
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小芳 《电脑技术——Hello-IT》2005,(3):14-15
不懂电脑,就会跟不上时代,不安宽带,上网就不如别人快乐。现在的孩子不是龙就是以凤,做父母的,自然恨不得自己的孩子跑在同龄人的最前面,买来电脑,安上宽带,然而,有不少父母,以为自己尽了父母的责任了,或者,是自己太忙了,没过多久,对孩子如何使用电脑,如何使用宽带,就不怎么关心了。 相似文献
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通过分析装备战斗损伤仿真的研究对象、仿真过程,结合目前装备战斗损伤仿真研究中存在的问题,提出了基于HLA研究装备战斗损伤仿真的设想——构建分布式装备战斗损伤仿真平台,分析了该平台实现的技术方案,需要的开发环境,根据装备战斗损伤仿真的过程,设计了平台的体系结构,定义了联邦成员,设计了平台的对象模型,确定了平台的执行逻辑结构,明确了平台的时间管理机制,通过计算联邦成员分布并行的执行仿真任务,有效地提高了仿真效率,通过HLA对象模型设计,提高了系统的可重用性,为装备战斗损伤仿真研究中存在的问题提供了一种解决方案。 相似文献
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针对具有上界约束的关联规则问题进行了研究,给出了上界约束的定义,分析了满足上界约束频繁集的性质,并给出了相关的证明。在此基础上,提出了基于FP-Tree的上界约束算法,采用了预先测试的方法,降低了测试项集的成本,提高了计算效率,实验结果证明该算法具有较高的效率。 相似文献
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The new method of defuzzification of output parameters from the base of fuzzy rules for a Mamdani fuzzy controller is given in the paper. The peculiarity of the method is the usage of the universal equation for the area computation of the geometric shapes. During the realization of fuzzy inference linguistic terms, the structure changes from the triangular into a trapezoidal shape. That is why the universal equation is used. The method is limited and can be used only for the triangular and trapezoidal membership functions. Gaussian functions can also be used while modifying the proposed method. Traditional defuzzification models such as Middle of Maxima − MoM, First of Maxima − FoM, Last of Maxima − LoM, First of Suppport − FoS, Last of Support − LoS, Middle of Support − MoS, Center of Sums − CoS, Model of Height − MoH have a number of systematic errors: curse of dimensionality, partition of unity condition and absence of additivity. The above-mentioned methods can be seen as Center of Gravity − CoG, which has the same errors. These errors lead to the fact that accuracy of fuzzy systems decreases, because during the training root mean square error increases. One of the reasons that provokes the errors is that some of the activated fuzzy rules are excluded from the fuzzy inference. It is also possible to increase the accuracy of the fuzzy system through properties of continuity. The proposed method guarantees fulfilling of the property of continuity, as the intersection point of the adjustment linguistic terms equals 0.5 when a parametrized membership function is used. The causes of errors and a way to delete them are reviewed in the paper. The proposed method excludes errors which are inherent to the traditional and non- traditional models of defuzzification. Comparative analysis of the proposed method of defuzzification with traditional and non-traditional models shows its effectiveness. 相似文献
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目前大多数研究对复杂社会网络关键节点影响力的识别都是静态的,缺乏动态变化的分析。采用可拓聚类方法对动态变化下的科教人际网络进行量化分析,首先以多属性决策法计算每个节点重要性,再利用变异系数权重法计算得该节点综合重要性量值,之后划分等级并取标准正域和正域区间,利用可拓关联函数计算每个节点与每个等级的关联度,关联度值最大的等级即为该节点对应等级,最后分析同一社会网络节点在不同时间点的重要性等级变化。可拓聚类方法尝试从动态上对网络节点重要性进行把握,最后通过实例验证了该方法的有效性。 相似文献
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多数社交网络影响力最大化算法的研究只关注于所选种子节点集合的影响力是否最优,忽略网络自身传播影响力的固有能力。本文对网络进行渗流模拟,计算渗流后网络的主连通分量随着传播概率改变的趋势,并且求得主连通分量大小增加开始变快的相变点,从而计算网络自身传播影响力的固有能力。通过相变值与种子节点集合大小的换算,求得当前网络最佳的种子节点集合大小。将种子节点集合大小限制在最佳大小范围内即可获得最佳的影响力。在kareteclub、football、highschool和socdolphins社交网络数据集上进行实验,验证了该方法的有效性。 相似文献
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针对目前流行的OpenFlow技术,本文提出OpenFlow的标准进展、商业价值和连通性测试。该方法根据控制层面和转发层面相分离的技术,采用移动研究院内网拓扑进行测试。实验结果表明,通过在BigSwitch controler上进行相关命令配置就可实现二层的OpenFlow交换机互联的不同网段主机的通信。OpenFlow是SDN技术中一种关键的接口协议,SDN是对网络的抽象, OpenFlow是对单个转发面设备的抽象。OpenFlow交换机和Control er的出现为新型互联网(NGN)体系结构的研究提供了实验途径。 相似文献
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邢轶男 《数字社区&智能家居》2006,(17)
简要介绍了销售管理系统的涵义和结构,并讨论报价管理系统的定义和作用。以销售管理系统报价管理子系统的开发为背景,论述了整个系统的开发过程,系统的可行性分析、结构和基本设计。全文共分为引言、系统规划与分析、系统设计、系统实施与运行、结束语五部分。该论文在应用程序的编制中采用了VisualBasic6.0,文中介绍了VisualBasic6.0的特点。最后还对管理信息系统的发展趋势进行了分析和展望。 相似文献
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高分一号卫星4种融合方法评价 总被引:4,自引:0,他引:4
以国产高分辨率卫星高分一号作为数据源,应用Pansharp融合、HPF融合、Gram-Schmidt融合和SFIM融合4种方法对高分一号卫星2m全色及8m多光谱数据进行了融合试验,并对融合结果的空间信息融入度和光谱保真度进行了评价。选取标准差、熵及联合熵、平均梯度、相对偏差4种客观评价指标对融合结果进行了计算与分析。研究结果表明:对于高分一号卫星,4种方法均显著提高了影像的空间分辨率,同时较好地保留了影像的光谱信息,提高了影像的利用率。其中Pansharp融合综合表现最好,HPF方法边界最为清晰,SFIM方法的光谱保真度最高,GramSchmidt融合在近红外波段效果最好。根据不同的研究目的,使用适宜的融合方法及参数,可以使高分一号卫星影像更好地为生产及科研工作服务。 相似文献
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基于XML的中间层交互技术的研究 总被引:1,自引:0,他引:1
由于HTML自身的不足.所以无法适应Web发展的复杂性和多变性,也不利于机器之间的数据交换和信息传递,通过对XML和HTML作多个角度的对比,文中提出将XML作为载体实现Web上的动态交互。首先从XML的自身特点出发,分析了XML驱动下的Web体系结构,从而得出基于XML的中间层交互技术的实现原理.重点研究了如何设计与XML相匹配的Web数据库,用XML查询数据库的实现方法,以及如何构造从XML到数据库的映射关系,具体包括从XIviL的DTD或者Schema出发来设计数据库的结构或者从数据库本身出发来构造与之相适应的DTD或Schema,最后分析了浏览XML格式信息的诸多策略。 相似文献
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The perception of vehicle ride comfort is influenced by the dynamic performance of full-depth foam used in many vehicle seats. The effects of the thickness of foam on the dynamic stiffness (i.e., stiffness and damping as a function of frequency) of foam cushions with three thicknesses (60, 80, and 100 mm), and the vibration transmitted through these cushions at the seat pan and the backrest were measured with 12 subjects (6 males and 6 females). With increasing thickness, the stiffness and the damping of the foam decreased. With increasing thickness of foam at the seat pan, the resonance frequencies around 4 Hz in the vertical in-line and fore-and-aft cross-axis transmissibilities of the seat pan cushion and the backrest cushion decreased. For the conditions investigated, it is concluded that the thickness of foam at a vertical backrest has little effect on the vertical in-line or fore-and-aft cross-axis transmissibilities of the foam at either the seat pan or the backrest. The frequencies of the primary resonances around 4 Hz in the vertical in-line transmissibility and the fore-and-aft cross-axis transmissibility of foam at the seat pan were highly correlated. Compared to sitting on a rigid seat pan with a foam backrest, sitting with foam at both the seat pan and the backrest reduced the resonance frequency in the vertical in-line transmissibility of the backrest foam and increased the associated transmissibility at resonance, while the fore-and-aft cross-axis transmissibility of the backrest was little affected. Compared to sitting without a backrest, sitting with a rigid vertical backrest increased the resonance frequency of the fore-and-aft cross-axis transmissibility of the seat pan cushion and increased the transmissibility at resonance.Relevance to industryThe transmissibility of a seat is determined by the dynamic properties of the occupant of the seat and the dynamic properties of the seat. This study shows how the thicknesses of foam at a seat pan and foam at a backrest affect the in-line and cross-axis transmissibilities of the foams at the seat pan and the backrest. The findings have application to the design of vehicle seats to minimise the transmission of vibration to the body. 相似文献
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An approach to the synthesis of fuzzy stabilization systems with a priori unknown model of an object
A method of synthesis of fuzzy stabilization systems for a broad class of dynamic objects under the assumption that the mathematical model of the object is not known a priori is proposed. The control is formulated in the form of a proportional law of adjustment as a function of a macro-variable; the square of the Euclidean norm of the phase variables is adopted as the macro-variable. An analogous variable characterizes the distance of the object from the equilibrium position. Despite the simplicity of the control law, its sign remains constant due to the fact that the macro-variable is positive-definite over the entire phase space. The switching times of the signals are determined by fuzzy identification of the system’s dynamic modes on the basis of measurement of the derivatives of the macro-variable. 相似文献
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根据高职院校自身教学资源的特点,采用Java EE的轻量级框架技术设计该系统。系统的业务层和表示层通过Struts与Spring的集成完成,数据持久层通过Spring与Hibernate的集成完成,整个系统页面采用Ajax技术。使用SSH框架不仅可以简化系统整个开发过程,同时还极大地增强了系统的可维护性和可扩展性。并且通过使用Ajax技术,也提高了整个系统页面的访问效率。 相似文献