基于复杂网络抗毁性与ADMPDE算法的网络拓扑结构优化

复杂网络抗毁性研究的重要内容之一,就是优化网络拓扑结构。在分析常用复杂网络抗毁性测度不足基础上,提出了以自然连通度为复杂网络抗毁性测度,建立了其拓扑结构优化模型;综合运用ADMPDE算法收敛好、寻优速度快等优点,通过适当改进用于求解复杂网络拓扑结构优化模型。通过仿真分析,验证了复杂网络拓扑优化模型及其求解算法的科学性与可行性,得出了拓扑优化过程网络结构变化一般性规律,并分析了网络拓扑结构优化前后,在不同攻击策略下复杂网络抗毁攻击能力。     

抗毁网络的物理结构设计

为设计网状的抗毁网络物理结构.将网络抗毁特性设定为网络的拓扑具有各节点对的二重回路,研究了能找到有二重回路的网状拓扑的实验性设计方法,并举例分析了其结果.     

基于遗传算法的定向天线网络拓扑控制

针对定向天线网络拓扑中拓扑结构的设计的问题,综合考虑了网络中节点的最大度、最大通信距离、连通度等因素,着重考虑构建一个k连通的通信网络拓扑,这个特性很好地保证了网络的抗毁性与可靠性。基于此建立了最优k-连通的网络拓扑模型,提出一个节点间的新的连接方式作为一个固定的模版,以此来确保网络的连通性。在此基础上利用遗传算法来对连接方式进行优化,给出了一种有效的编码方式,并且采用有序交叉作为交叉运算,避免了每次交叉后的个体网络连通性检查,降低了交叉运算的时间复杂度,同时保护了染色体中较好的模式被遗传到子代个体。找出了节点间更好的拓扑连接形式,通过仿真实验得到了很好的结果。     

通信网络抗毁性的评价方法

基于多抗毁性度量值的评估技术,以作战运用的视角,对通信网络的抗毁性进行评价.首先,从通信网络抗毁性的定义出发,构建了通信网络拓扑结构的抗毁性评价模型.在所建模型中,选取了用户较为关心的网络抗毁性量度,方差的引入弥补了以往的量度不能体现个体差异的不足.其次,采取的点打击策略没有按度的大小进行打击,而是取路径中出现次数最多的点进行打击,这更符合实际情况.最后利用模型对实例进行了分析,结果表明模型不仅能够评价通信网络拓扑结构的抗毁性,而且还能指出网络结构需要优化的地方.     

一种三维无线传感网络拓扑控制算法的研究

当前关于三维拓扑控制的研究主要侧重在保证网络的连通性,并没有很好的考虑到邻居节点度和能耗最低路径两者之间的权衡关系.针对该问题提出了一种可调节的无线传感器网络拓扑控制算法,通过调整因子r(0＜r＜1)动态调整网络拓扑结构,使网络具有良好邻居节点度的同时保留了部分能耗最低路径.仿真实验数据表明该算法构造的网络拓扑图具有良好的可调节性和稀疏性,同时算法在优化网络生命周期和节点功率方面都具有较明显的效果.     

基于BA无标度网络的WSNs拓扑优化模型

由于无线传感器能量受限,最大化网络生命周期成为优化网络拓扑首要考虑的问题。基于BA无标度理论,提出了一种WSNs拓扑优化模型(WTOM)。在网络中引入超级节点,结合粒子群算法合理地划分整个网络;在节点间建立多因素为导向的虚拟力场,利用虚拟力调整超级节点的部署位置,实现网络能量的均衡消耗,通过对关键节点的保护,提高网络的抗毁鲁棒性。经理论分析和实验证明,该网络不仅继承了BA无标度网络的特征还具有小世界特性;同时该动态拓扑延长了网络的生命周期,提高了网络面向数据收集的节能性。     

复杂网络抗毁性研究进展

随着复杂网络研究的兴起,复杂网络抗毁性研究的重大理论意义和应用价值日益突显出来,成为极其重要而且富有挑战性的前沿科研课题.本文总结综述了国防科技大学信息系统与管理学院在复杂网络抗毁性领域取得的研究进展,具体包括:研究了不完全信息条件下复杂网络拓扑结构抗毁性;提出了复杂网络拓扑结构抗毁性的谱测度方法;分析了3种结构属性对复杂网络拓扑结构抗毁性的影响;提出了基于禁忌搜索的复杂网络拓扑结构抗毁性仿真优化方法.     

不同信息条件下加权复杂网络抗毁性仿真研究

针对加权复杂网络的抗毁性分析问题,选取网络效率和网络鲁棒性作为抗毁性的度量指标,对加权网络在不同信息条件下抗毁性的变化进行数值仿真模拟.最后,对成本和性能约束下加权网络的抗毁性进行定量分析,给出不同信息条件下加权网络抗毁性的优化策略.结果表明:在基于局部拓扑信息的攻击策略下,权重系数越大,网络的抗毁性越强;在基于全局拓扑信息的攻击策略下,网络的抗毁性要优于基于局部信息的攻击策略,且权重系数为0.5的网络在攻击初始阶段抗毁性最强;另外,若能在攻击早期加大对节点的防护力度,则会大大降低对网络性能的影响.     

移动智能体网络的优化功率控制及同步

从网络拓扑结构连通性与网络整体同步行为的内在关联出发,提出一种移动智能体网络的功率控制策略.首先确定满足网络拓扑结构连通的最小感知半径;其次以提高整个移动智能体网络的拓扑结构抗毁性为优化目标提出一种代价函数,在最大功率限制下的最大感知半径及保证连通的最小感知半径的范围内采用粒子群优化算法(PSO)予以优化,寻求同时满足网络连通性与抗毁性需求的个体感知半径;随后基于该控制策略,以个体感知邻域内运动方向偏差最大的2个邻居个体运动方向的中值作为个体下一时刻的运动方向,研究了移动智能体网络的快速同步问题.仿真结果表明:通过调节个体感知半径,移动智能体网络的功率控制和抗毁性能得到了提高.     

多自适应波束天线节点的最优组网拓扑控制

自适应波束天线由于其发射接收具有强指向性的特点,其网络拓扑控制问题、方法与全向天线存在较大不同。针对节点安装有多个空间均匀分布的自适应波束天线进行组网通信时的拓扑优化控制问题,建立了自适应波束天线和网络节点通信的数学模型;对拓扑优化控制的问题进行了分析,其问题本质是对节点安装的多部天线进行最优化链路分配。以网络通信质量的量化计算作为目标函数,提出了一种基于0-1规划的拓扑控制优化模型,并对网络连通性进行了分析,给出了两节点连通以及整个网络连通的充要判决条件。最后给出了2种不同节点数情况下的仿真计算结果,并通过穷举法验证了模型计算结果的正确性。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.