云模型蚁群算法在无人机航迹规划中的应用

为中高空飞行的无人机提出了一种新型航路规划算法。该方法基于云模型蚁群算法。基本蚁群算法有着突出的缺陷:易陷入局部最优解而且需要计算时间长。提出的改进型蚁群算法,通过云模型来控制信息素强度Q和挥发系数ρ的大小,从而得到更好的收敛性与避免陷入局部最优解,并进行了TSP问题的仿真计算。通过将无人机任务地图网格离散化,运用云模型蚁群算法进行航迹规划。     

一种基于监工机制的改进蚁群算法

针对基本蚁群算法存在收敛速度慢、易陷入局部最优解等问题,受监工机制的启发,提出了监工蚁群算法,以监工距离作为评价标准,自适应地选择优良的蚂蚁更新信息素,提高了每次迭代中解的质量,指导之后的蚂蚁进行更好的学习。该算法选用优化的全局更新策略,使得信息素在进化前期增加较多,在后期增加较少;同时,自适应地将信息素的值限定在一定范围内,防止某条路径被选择的概率过大或者过小。该算法还添加了发散和收敛机制,当算法陷入局部最优解时,增加探索的概率,有助于跳出局部最优解。仿真结果表明,监工蚁群算法具有较高的全局寻优能力,减少了迭代次数,增强了算法的稳定性。     

基于人工智能优化理论的无线电频谱分配

为了提高无线电频谱的利用率,提出一种改进蚁群算法的无线电频谱分配方法.以系统带宽收益最大化为目标优化函数,引入自适应搜索窗口限制蚁群算法的活动范围,并对局部信息素和全局信息素进行改进,加快了最优解的搜索速度,降低了陷入局部最优解的概率.仿真测试结果表明,改进后的算法能够快速找到无线电系统频谱分配的最优方案,系统效益优于对比算法.     

基于自适应多态融合蚁群算法的无人机航迹规划

为解决传统航迹规划最短路径算法易陷入局部最优及复杂地形情况下的无人机航迹规划问题,提出了一种基于自适应多态融合蚁群算法的航迹规划方法。通过对航迹规划问题进行描述,建立数学模型,将自适应和蚁群算法相结合,与多态蚁群形成了全局、局部并行搜索模式,以提高算法寻找全局最优值的能力;提出自适应并行策略和自适应信息更新策略,以提升其全局搜寻能力。仿真结果表明,自适应多态融合蚁群算法较传统蚁群算法和多态蚁群算法具备更好的性能,能有效地提高搜索路径的长度和收敛速度,从而避免在求解过程中陷入局部最优,因此在求解最优航迹规划问题上有很好的应用前景。     

基于改进蚁群算法的古建筑群火灾疏散路径规划

针对古建筑群突发火灾的情况下,为了在保证人员可安全通行的条件下规划出最短疏散路径,提出了一种基于改进蚁群算法的路径搜索模型,对算法的启发函数、回退策略、信息素浓度、信息素挥发系数进行了改进。并以云南大理巍山古城内部实际地形为例建立栅格图模型,通过仿真模拟实验对改进算法的参数组取值进行测试选取,确定参数组取值后,对改进蚁群算法的可行性进行仿真模拟实验,证明改进蚁群算法提高了算法的收敛速度和全局搜索性,降低了算法陷入局部最优解的可能性。     

混合自适应蚁群算法及其应用研究

针对已有蚁群算法在复杂问题应用中寻优前期信息素匮乏、收敛速度慢的不足，通过引入信息权重因子和信息量均衡算子对蚁群的选择概率和信息素浓度进行自适应调节，提出了混合自适应蚁群算法。算例结果表明，该算法具有较快的寻优速度和更好的全局搜索能力，同时增加了解的多样性，减小了陷入局部极值的几率。     

基于吸引场的蚁群算法在TSP中的应用

针对传统蚁群算法容易陷入局部最优解等缺陷,提出了一种基于吸引场的改进的蚁群算法.首先,详细分析了基于信息素的吸引场原理,在此基础上建立了基于信息素的吸引场模型.其次,设计了吸引场因子,给出了信息素更新策略,使相距较近的蚂蚁之间能更好地进行协作.最后,针对标准的30个城市的旅行商问题,使用所提出的算法与基本蚁群算法、其他改进的蚁群算法进行优化分析,并进行了结果对比.结果表明:所提出的蚁群算法可以获得TSP问题的最优解423.74,Oliver30问题计算结果最优值为423.74,平均值为423.96,具有较好的搜索全局最优解的能力.     

自适应多启发蚁群算法的无人机路径规划

为了解决蚁群算法在无人机实现路径规划中容易陷入局部最优的问题,提出改进的蚁群算法。对信息素的挥发因子以及信息素进行上、下限设置,防止由于较短路径上的信息素过高以及较长路径上的信息素过低,使蚂蚁陷入局部最优,同时在多启发因素的影响下,将路径的整体长度作为决定状态转移概率的一个自适应启发函数因子,当路径长度很大时,自适应启发函数因子较小,使得蚁群选择该路径的概率减小。实验结果表明,改进的算法在路径长度上减少了6.4%,最优路径长度方差降低了85.78%,增加了对环境整体性的考虑,缩短了路径长度,降低了迭代次数,跳出局部最优。在环境复杂度加大的情况下,引入自适应启发函数因子之后的算法可以有效地选择较好的路径,为无人机路径规划提供了理论依据。     

信息素S型更新的耦合ACO算法及其应用

针对蚁群算法存在易过早收敛、出现停滞现象、陷入局部极值的问题,提出S型信息素更新策略与Alopex算法相耦合的改进蚁群优化算法(IACO).该算法定义全新的S型动态自适应信息素全局更新函数,使信息素增量随迭代次数和目标函数值变化而动态变化,同时耦合Alopex算法以提高算法的局部搜索能力.将IACO算法应用于支持向量机参数的优化中,构成IACO-SVM模型.利用UCI标准数据集进行数值实验.研究结果表明:IACO算法具有较强的寻优性能,IACO-SVM模型具有较高的平均分类准确率和较好的稳定性.     

室内服务机器人路径导航系统设计及算法

随着各行业智能化的快速发展,室内服务机器人逐渐地走进了人们的日常生活中。针对日益复杂的室内环境以及对机器人路径规划技术要求的不断提高,本文采用激光雷达、底盘驱动、人机交互等功能模块相结合,设计了一种室内服务机器人路径导航系统。同时对传统蚁群算法进行改进,提出了自适应信息素浓度和动态信息素挥发因子,使改进后的蚁群算法具有较高的全局搜索能力,避免了传统蚁群算法前期易陷入局部最优的问题,最后将改进后的蚁群算法应用到移动机器人路径规划上。为了验证改进蚁群算法的有效性,用MATLAB软件进行仿真分析,仿真结果证明了改进蚁群算法在移动机器人路径规划时具有较强的全局寻优能力,同时提高了收敛速度。     

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.     

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.     

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。     

A computer generator for randomly layered structures

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

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.     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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