利用节点效率评估复杂网络功能鲁棒性

为了克服现有复杂网络鲁棒性研究模型只考虑节点失效的局部影响性和网络拓扑鲁棒性的缺陷, 提出了一种利用节点效率来评估复杂网络功能鲁棒性的方法. 该方法综合考虑节点失效的全局影响性, 利用网络中节点的效率来定义各节点的负载、极限负载和失效模型, 通过打击后网络中最终失效节点的比例来衡量网络的功能鲁棒性, 并给出了其评估优化算法. 实验分析表明该方法对考虑节点负载的复杂网络功能鲁棒性的评定可行有效, 对于大型复杂网络可以获得理想的计算能力.     

利用重要度评价矩阵确定复杂网络关键节点

为了对复杂网络节点重要度进行评估,针对节点删除法、节点收缩法和介数法的不足,通过定义节点效率和节点重要度评价矩阵, 提出了一种利用重要度评价矩阵来确定复杂网络关键节点的方法.该方法综合考虑了节点效率、节点度值和相邻节点的重要度贡献,用节点度值和效率值来表征其对相邻节点的重要度贡献,其优化算法的时间复杂度为O(Rn²). 实验分析表明该方法可行有效,对于大型复杂网络可以获得理想的计算能力.     

新型快速多极杂交边界点法在复合材料热传导中的应用

将杂交边界点法应用于复合材料的热传导模拟,推导一种求解复合材料的方程,该方程减少计算自由度,效率更高.将新型快速多极算法与杂交边界点法结合进行大规模计算,数值算例中对包含大量粒子的复合材料进行模拟,结果表明快速多极杂交边界点法可行,具有一定的应用前景.     

区间五次Hermite样条多小波Euler-Bernoulli梁单元

首先采用区间五次Hermite样条函数,分别构造了三节点梁的边界和中间节点的多小波尺度函数,然后,基于小波多辨分析思想,构建了梁单元位移多尺度近似空间的基函数系;最后,采用最小势能原理,得到弯曲梁的平衡方程,从而构造了区间五次Hermite样条多小波Euler-Bernoulli梁单元。算例结果表明,该小波单元可通过改变尺度来重新划分网格,从而可自由调节单个小波单元的计算精度,其计算精度与在相同网格划分下采用传统三节点Hermite梁单元计算的完全一致;与其它小波单元相比较,该小波单元具有计算简单明了,物理意义明确,易于理解的特点。     

Oscillatory Dynamics and Oscillation Death in Complex Networks Consisting of Both Excitatory and Inhibitory Nodes

In neural networks, both excitatory and inhibitory cells play important roles in determining the functions of systems. Various dynamical networks have been proposed as artificial neural networks to study the properties of biological systems where the influences of excitatory nodes have been extensively investigated while those of inhibitory nodes have been studied much less. In this paper, we consider a model of oscillatory networks of excitable Boolean maps consisting of both excitatory and inhibitory nodes, focusing on the roles of inhibitory nodes. We find that inhibitory nodes in sparse networks (small average connection degree) play decisive roles in weakening oscillations, and oscillation death occurs after continual weakening of oscillation for sufficiently high inhibitory node density. In the sharp contrast, increasing inhibitory nodes in dense networks may result in the increase of oscillation amplitude and sudden oscillation death at much lower inhibitory node density and the nearly highest excitation activities. Mechanism under these peculiar behaviors of dense networks is explained by the competition of the duplex effects of inhibitory nodes.     

Dynamics Behaviors and Scaling in Intermittent Turbulence of a Shell Model

In this paper, the dynamics behaviors on fo-δ parameter surface is investigated for Gledzer-Ohkitani- Yamada model We indicate the type of intermittency chaos transitions is saddle node bifurcation. We plot phase diagram on fo-δ parameter surface, which is divided into periodic, quasi-periodic, and intermittent chaos areas. By means of varying Taylor-microscale Reynolds number, we calculate the extended self-similarity of velocity structure function.     

关于驻波能量的分析

通过对驻波的波节、波腹及波节、波腹之间能量的定量讨论,进一步说明驻波的能量问题．     

云计算网络中边界节点识别方法改进研究

目前,云计算网络为人们的生产和生活提供了各种应用和服务,网络边界节点的识别问题一直较难解决。传统的网络中边界节点类型复杂,边界部署成本高,较多感知模型和静态场景难以实现。为此,提出一种改进的云计算网络中边界节点识别方法,通过制定边界部署规则确定边界节点部署数量及要求,对边界节点感知漏洞进行修补,保证边界节点对网络区域内的全覆盖识别,最后设计出云计算网络识别模型,实现了云计算网络中边界节点正确识别。仿真实验表明,提出的边界节点识别方法在稳定性、识别率和识别数量上都比传统方法有优越性,具有应用价值。     

基于移位算子时域有限差分的色散薄层节点修正算法

提出了一种时域有限差分（FDTD）计算中色散介质薄层问题处理的新算法.对于厚度小于一个元胞尺度的电小尺寸色散介质薄层问题,采用将元胞内电位移矢量和磁感应强度加权平均的方法,求得薄层所在元胞内修正点处的等效介质参数.然后根据常见色散介质模型,包括Debye模型、Lorenz模型、Drude模型等,介电常数和磁导率可以表示为jω分式多项式的特点,结合频域到时域的转换关系（即用/t代替jω）和移位算子方法得到了修正点处的时域本构关系,进而获得时域递推计算式.数值结果表明,该方法具有通用、节省计算时间、节省内存和计算精度良好等优点. 关键词： 色散介质薄层 节点修正 移位算子 时域有限差分     

Mannose‐Modified Serum Exosomes for the Elevated Uptake to Murine Dendritic Cells and Lymphatic Accumulation

The surface of bovine serum‐derived exosomes (EXOs) are modified with α‐d ‐mannose for facile interaction with mannose receptors on dendritic cells (DCs) and for efficient delivery of immune stimulators to the DCs. The surface of the EXOs is modified with polyethylene glycol (PEG) without particle aggregation (≈50 nm) via the incorporation of 1,2‐distearoyl‐sn‐glycero‐3‐phosphoethanolamine (DSPE) into the lipid layer of the EXO, compared to chemical conjugation by N‐hydroxysuccinimide activated PEG (NHS‐PEG). PEG modification onto the exosomal surface significantly decreases the non‐specific cellular uptake of the EXOs into the DCs. However, the EXOs with mannose‐conjugated PEG‐DSPE (EXO‐PEG‐man) exhibit excellent intracellular uptake into the DCs and boost the immune response by the incorporation of adjuvant, monophosphoryl lipid A (MPLA) within the EXO. After an intradermal injection, a higher retention of EXO‐PEG‐man is observed in the lymph nodes, which could be used for the efficient delivery of immune stimulators and antigens to the lymph nodes in vivo.