共查询到20条相似文献,搜索用时 78 毫秒
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具有自相似特性的业务及其对ATM网络性能的影响 总被引:2,自引:0,他引:2
本文对自相似业务的定义,性质和生成方法进行了综述了讨论了自相似业务对ATM网络 影响。最后,指出了待进一步深入伯课题。 相似文献
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一种基于小波的网络流量发生器设计 总被引:1,自引:1,他引:0
网络流量发生器在网络性能分析和协议实现中具有重要的作用。文章基于多分形小波模型,设计了一种自相似网络流量发生器。其中对随机数的生成、序列的截断、自相似序列的生成以及自相似流量的生成等主要设计部分进行了论述。与常用的基于分形布朗运动的模型的流量发生器相比,该发生器生成的流量具有更准确的自相似流量特性。 相似文献
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本文使用Sierpinski填料作为例子,分析了自相似扩展分形网屏弗琅荷费近轴区的透射场,发现该透射场同样具有自相似特性。 相似文献
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提出了一种适应于自相似业务环境的网络流量采集算法,该算法在多级过滤的基础上引入概率接纳机制。理论分析表明,该算法保留了多级过滤使用内存小的优点,同时又能反映自相似业务环境下业务流在多时间尺度上的突发性,提高了流量采集的准确性。 相似文献
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IP波长路由网络的性能分析 总被引:2,自引:2,他引:0
提出了将IP交换的Ipsilon数据流管理协议(IFMP)和通用交换机管理协议(GSMP)进行适当扩展,用来支持IP波长路由网络;采用自相似业务量分析了IP波长路由网络的交换增益性能。仿真结果表明,业务量的自相似程度越高,交换增益越高。 相似文献
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本文针对英特网上的一个常用协议-远程登录(TELNET)协议分析了它的客户端数据包产生的时间间隔分布,发现泊松模型的指数分布不能很好地刻画它的特性。本文依据Tcplib提供的经验分布曲线,认为Pareto分布在很大时间范围内能较好地描述TELNET的客户端流量特性,并对其突发序列的特性进行了分析。本文最后指出在描述网络流量时自相似模型要比泊松模型有效和精确得多,并给出了Pareto分布在建立自相似 相似文献
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The self‐assembly of peptides enables the construction of self‐assembled peptide nanostructures (SPNs) with chemical composition similar to those of natural proteins; however, the structural complexity and functional properties of SPNs are far beneath those of natural proteins. One of the most fundamental challenges in fabricating more elaborate SPNs lies in developing building blocks that are simultaneously more complex and relatively easy to synthesize. Here, the development of self‐assembling Janus peptide dendrimers (JPDs) is reported, which have fully 3D structures similar to those of globular proteins. For the reliable and convenient synthesis of JPDs, a solid‐phase bifurcation synthesis method is devised. The self‐assembly behavior of JPDs is unique because only the dendrimer generation and not the weight fraction dictates the morphology of SPNs. The coassembly of two JPD building blocks provides an opportunity not only to enlarge the morphological repertoire in a predictable manner but also to discover SPNs with unusual and interesting morphologies. Because JPD assemblies have dual multivalency, i.e., supramolecular and unimolecular multivalency, the JPD system enables the statistical selection of materials with high avidity for the desired cell types and possibly any target receptors. 相似文献
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圆形螺旋线圈自感和分布电容的计算 总被引:1,自引:0,他引:1
提出了一种计算圆形螺旋线圈自感和分布电容的方法。在元件尺寸小于波长的准静态近似情况下用 Sommerfeld类型积分计算小段平面圆弧的自感和互感 ,然后用螺旋线方程对每一小段圆弧的自感和圆弧间的互感积分 ,算得螺旋线圈的自感。计算螺旋线圈分布电容时同样先计算出两小段同心圆弧间的电容 ,然后用螺旋线方程对其积分算得螺旋线圈的总分布电容。编制了相应的程序对多种情况下的螺旋线圈自感和分布电容进行了计算 ,计算与实验结果比较 ,有较好的一致性。与经验公式相比 ,计算自感的方法有更广的适用范围和对实验结果更好的逼近。而分布电容的计算方法比其它的方法大大减少了运算量。 相似文献
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We have developed a directed self‐assembly process for the fabrication of three‐dimensional (3D) microsystems that contain non‐identical parts and a statistical model that relates the process yield to the process parameters. The self‐assembly process uses geometric‐shape recognition to identify different components, and surface tension between liquid solder and metal‐coated areas to form mechanical and electrical connections. The concept is used to realize self‐packaging microsystems that contain non‐identical subunits. To enable the realization of microsystems that contain more than two non‐identical subunits, sequential self‐assembly is introduced, a process that is similar to the formation of heterodimers, heterotrimers, and higher aggregates found in nature, chemistry, and chemical biology. The self‐assembly of three‐component assemblies is demonstrated by sequentially adding device segments to the assembly solution including two hundred micrometer‐sized light‐emitting diodes (LEDs) and complementary metal oxide semiconductor (CMOS) integrated circuits. Six hundred AlGaInP/GaAs LED segments self‐assembled onto device carriers in two minutes, without defects, and encapsulation units self‐assembled onto the LED‐carrier assemblies to form a 3D circuit path to operate the final device. The self‐assembly process is a well‐defined statistical process. The process follows a first‐order, non‐linear differential equation. The presented model relates the progression of the self‐assembly and yield with the process parameters—component population and capture probability—that are defined by the agitation and the component design. 相似文献
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Solvent‐Controlled Assembly of Aromatic Glutamic Dendrimers for Efficient Luminescent Color Conversion
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《Advanced functional materials》2018,28(34)
A binary supramolecular system where self‐sorting and coassembly behavior can be switched by changing the solvent polarity is hereby reported. Glutamic dendron is separately conjugated with pyrene and naphthalimide luminophores through an alkyl spacer. The resulting structurally similar building units can self‐assemble into one‐dimensional micro/nanostructures with hexagonal and lamellar packing, respectively. Varying solvents from polar aqueous solution to nonpolar decane is evidenced to profoundly inverse the superchirality and switch self‐sorted assembly to coassembly of the two building blocks. The moisture sensitivity of the naphthalimide moiety is considered the primary driving force for the self‐sorting phenomenon in aqueous solution, resulting in inevitable hydration to repel its stacking with hydrophobic pyrene moiety. On the other hand, the naphthalimide unit can integrate segmentally with the pyrene unit in decane, greatly facilitating the nanofiber growth and supramolecular gel formation along with improved energy transfer efficiency between luminophores. As a result, the coassembly‐based thin films show efficient luminescent color conversion upon the UV light irradiation. This research presents a useful route for the fabrication of controllable solution‐processed light emitting devices from self‐assembled multicomponent systems. 相似文献
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多外腔自混合干涉现象的理论与实验 总被引:4,自引:0,他引:4
考虑激光器外有多个反射体时所产生的自混合干涉现象,运用薄膜干涉理论,对弱光反馈条件下的多外腔自混合干涉理论进行了研究。基于复合腔激光器结构,建立了理论模型。理论分析构造了一个含有五个反射面的自混合干涉模型,模型是由三个外腔构成的多外腔自混合干涉。对模型进行了理论分析及数值仿真,得出在弱光反馈条件下,多外腔自混合干涉信号类似于传统的自混合干涉信号,为一类正弦波(外部反射率较小时)或类锯齿波(外部反射率较大时)。设计了实验系统,给出了实验结果并进行了验证。如果忽略多外腔的结构,理论所得结果与简单的三镜腔自混合干涉结构所得结果一致。 相似文献