基于自适应模糊神经网络的机器人路径规划方法

为了解决传统反应式导航中的复杂陷阱问题,优化导航控制,减少计算复杂度,提出了基于自适应模糊神经网络的机器人导航控制及改进型虚目标路径规划方法.首先根据移动机器人运动学模型,融合神经网络的自主学习功能与模糊控制的模糊推理能力,提出了基于自适应模糊神经网络的机器人导航控制器,将生成的Takagi-Sugeno型模糊推理系统作为机器人局部反应控制的参考模型.该自适应模糊神经网络控制器实时输出扰动角度,在线调整移动机器人的预瞄准方向,使移动机器人能够无碰撞趋向目标.然后,提出了一种改进型虚目标方法,优先选择机器人可能逃脱陷阱状态的路径,简化了设计难度,改变了虚目标切换方式,避免了大量复杂计算.实验结果表明,提出的方法可以帮助机器人在全局信息未知的复杂环境中导航,在趋近目标点的过程中能有效避障,无冗余路径产生,且轨迹平滑.     

基于神经网络的移动机器人路径规划算法的仿真

研究一种基于神经网络的移动机器人路径规划算法，充分利用神经网络的融合性和并行性提高移动机器人路径规划算法的运算速度．此算法也可以解决机器人的全局路径规划和局部路径规划问题．仿真结果表明这种算法可以快速可行地实现无碰撞优化路径规划，并且对动态环境具有较好的适应性．     

基于概率路线图的动态环境下移动机器人路径规划的神经网络方法

在不稳定的环境中,最短或最优的路径规划对移动机器人的有效运行至关重要.文章扩展了一种用于移动机器人实时路径规划的神经网络方法.本文使用概率路线图(Probabilistic Roadmap, PRM)来解决移动机器人在不稳定环境中的实时无碰撞运动规划问题.神经网络拓扑中的每个神经元都具有局部连通性,并且分流方程是其神经动力学特征.因此,计算复杂度与神经网络的大小成线性关系.实时机器人的运动取决于神经网络的动态环境,其中不需要任何先前的动态环境知识甚至学习过程.仿真结果证明了该方法的有效性和高效性.     

用模糊逻辑法对移动机器人进行路径规划的研究

分析模糊逻辑方法在移动机器人路径规划中存在的问题,建立了移动机器人的运动学模型,提出一种基于行为的移动机器人体系结构,设计了一种用于在未知、非结构化环境中规划机器人移动路径的自组织模糊控制器,模糊规则的制定符合贪心算法的思想．提出了解决“对称无法确定”问题的方法,给出了判断机器人是否进入死锁状态、解除死锁以及判断死锁是否解除的新方法,并在多种环境中用仿真实验验证了这些方法的正确性和合理性．     

动态环境中基于遗传算法的移动机器人路径规划的仿真

动态环境中 ,移动机器人的动态路径规划是一个较难解决的课题 .提出了一种基于遗传算法的移动机器人的路径规划方法 .该方法采用实数编码和有明确物理意义的适应度函数 ,可以加快实时的运算速度和提高运算精度 .同时 ,该方法充分挖掘了可应用遗传算法解决移动机器人动态路径规划的潜力 .计算机仿真表明 ,仿真该控制方法具有良好的动态路径规划能力     

基于简化可视图的环境建模方法

针对移动机器人全局路径规划中环境地图的构建问题，提出一种基于简化可视图的环境模型建立方法.该建模方法通过剔除环境中对路径规划结果不造成影响的障碍物来简化环境模型的表示.在环境建模期间，利用机器人的起点和目标点以及环境中保留的障碍物建立一种可视边的数量足够少的简化可视图，简化可视图中的可视边即为移动机器人的可行路径.根据简化可视图建立的环境地图提高了后续移动机器人路径规划算法的执行效率.仿真结果表明该建模方法简单且有效.     

基于智能技术的移动机器人路径规划方法概述

移动机器人路径规划是环境模型和搜索算法相结合的一种技术,规划过程既是搜索的过程,也是推理的过程。近几年人工智能中的很多优化推理技术也被运用到移动机器人路径规划中来,主要有模糊逻辑、神经网络、遗传算法和混合方法。     

基于模糊神经网络算法的机器人路径规划研究

路径规划是移动机器人研究的关键技术之一。在研究模糊理论和神经网络的基础上,提出了一种新的算法,即模糊神经网络。模糊神经网络既可以像神经网络那样并行处理、自行学习,又可以像模糊理论处理模糊信息、完成模糊推理功能。采用模糊神经网络来对移动机器人的路径进行规划,充分发挥模糊理论和神经网络的各自优势,从而获得从起始点到目标点的最优路径。在环境信息完全未知且静态的情况下进行了仿真实验,结果表明:该算法效率高、收敛速度快,有效提高了移动机器人的智能化水平。     

基于模糊控制器的移动机器人路径规划仿真

借鉴模糊控制的思想来解决移动机器人路径规划中的避碰问题，介绍了模糊控制的理论基础，对路径规划算法进行了推导，在总结经验建立模糊规则的基础上，运用模糊推理，构造出一张实践效果较好的控制响应表．仿真结果表明，该算法应用于移动机器人路径规划具有正确性、实用性和智能性等，该方法计算量小，运算速度快，提高了机器人控制的速度．     

动态环境下基于行为动力学的移动机器人路径规划

通过非线性微分方程描述的移动机器人各种行为模式的演变,模拟人类路径规划方式,应用行为动力学方法对动态环境下移动机器人路径规划问题进行了研究。首先,确定了路径规划的行为变量和行为模式,构建了机器人的航向角动力学模型与速度动力学模型,并分析了不稳定不动点,以及给出相应的解决方法;其次,为了得到更好的规划路径,采用竞争模型进行行为模式权值的自适应调节;最后的仿真结果表明模型是正确的,以及权值调节是有效的。     

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.     

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.     

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.     

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.     

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.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the