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Search Results: 1 - 10 of 116207 matches for " 赵嶷飞 "
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基于人工势场算法的改航路径规划
徐肖豪,李成功,,李雄
交通运输工程学报 , 2009,
Abstract: 在恶劣天气或流量受限条件下,建立了基于人工势场算法的改航路径规划模型。考虑空中交通管制程序和飞行性能等约束条件,采用线性拟合的方法对初始改航航路径进行分段拟合,消除振荡点和误差较大的离散点;对拟合后的航段通过截弯取直的方法,去除多余的转弯点,生成最终的改航路径。仿真结果表明现行的沿扩展受限区边界绕飞的改航路径长度为532.299km,而采用新改航规划模型生成的改航路径长度为455.924km,在没有增加额外转弯点的条件下,航线长度减少了14.35%,因此,采用该规划方法可安全有效地避开飞行受限区域。
基于几何方法的洲际航空编队飞行路径规划
Geometric approach for intercontinental formation flight path planning

徐肖豪,孟令航,
- , 2015, DOI: 10.13700/j.bh.1001-5965.2014.0515
Abstract: 摘要 针对洲际航空编队飞行路径规划,首先,基于编队飞行空气动力学的研究结论和球面度量特征,建立了编队飞行路径规划的基本模型;其次,基于编队路径的拓扑特征,将编队路径规划问题抽象为球面点集上基于测地线的加权Steiner最小树规划问题(WGSMT),建立了WGSMT的有限几何简化原则;针对避障编队路径规划,证明衔接点的引入仅改变紧邻的Steiner 点的拓扑特征,而不降低规划结果的准确性,以支持OAWGSMT编队路径规划.最后,构造一种基于“构造-修复”思想的编队路径规划方法,通过实际算例验证了算法的有效性.研究形成洲际航空编队路径规划的几何基础,使问题复杂度依赖于航班集规模而非球面离散化网格规模.
Abstract:For intercontinental formation flight path planning problem, a basic model was developed based on the aerodynamic models and spherical metric characteristics of formation flight. The problem was then abstracted as the weighted geodesic Steiner minimum tree (WGSMT) problem in spherical point set due to its topological characteristics. The principles of simplifying WGSMT to a finite geometry planning problem were proposed. We also proved that the connecting points induced by obstacles only changed the topology of their adjacent Steiner points while did not lose the accuracy of solution. Finally, a two stage formation path planning algorithm based on “construct-repair” approach was developed, whose validity was verified by an example. Significance of the study is that the sphere geometric fundamentals of intercontinental formation path planning are built,which therefore makes the complexity of the problem depend on the scale of flight set rather than that of geographic grids, thereby reduces the complexity of the problem dramatically.
考虑行李的多格子元胞自动机登机模型
Multi-grid cellular automata boarding model considering carried baggages

任新惠,焦阳,
- , 2017,
Abstract: 为了精确描述旅客登机过程,分析了经典的旅客登机模型,考虑了旅客携带行李占用过道空间与步行速度,刻画了2种新的过道干扰:速度干扰和入座干扰,建立了多格子元胞自动机登机模型,根据旅客携带行李数量,提出了多行李优先登机策略。分析结果表明:当客座率为100%时,新模型登机时间为1 455 s,干扰次数为6 720,经典模型登机时间为1 244 s,干扰次数为5 412,相比于经典登机模型,新模型模拟了机舱内旅客运动的复杂情况,元胞尺寸增大,旅客间相互作用增强,因此,登机时间较长,过道干扰较大,比较符合实际旅客登机行为; 当客座率为100%时,采用多行李优先登机策略的登机时间为1 303 s,相比随机登机策略减少了150 s,节省登机时间10.3%,过道干扰次数为5 686,相比随机策略减少了808次,因此,采用多行李优先登机策略能有效地减小过道干扰,提高登机效率。
In order to accurately describe passenger boarding process, the classic boarding model was analyzed. The luggage-occupied aisle space and movement speed of passenger were considered, two new aisle interferences were proposed, namely speed interference and entering seat interference, and a multi-grid cellular automata boarding model was built.A multi-baggage priority boarding strategy was proposed according to the numbers of passengers' baggages. Analysis result shows that when the seat occupancy is 100%, the boarding time and interference number with the new model are 1 455 s and 6 720 times, respectively, while the corresponding values with the classic model are 1 244 s and 5 412 times.Compared with the classic model, in the new model, because the complexity of passenger movement in the cabin is simulated, the cell size and the interaction between passengers increase, so the boarding time is longer, and the aisle interference is larger, which more accords with the actual boarding behavior of passenger. When the seat occupancy is 100%,the multi-baggage priority boarding strategy is compared with the random boarding strategy, the boarding time is 1 303 s and decreases by 150 s, namely 10.3%, and the aisle interference number is 5 686 times and reduces 808 times, so the new boarding strategy can effectively reduce the aisle interference and improve the boarding efficiency. 1 tab, 13 figs, 25 refs
铁道部基建总局系统第三次电算工作会议工作报告
陈克
铁道工程学报 , 1985,
Abstract:
多Agent群体行为中的扩散趋同综述*

模式识别与人工智能 , 2009,
Abstract: 为了研究复杂系统及复杂性科学问题,人们提出多Agent模型进行建模和分析.多Agent的群体行为是复杂系统研究所必须解决的问题,而其中的扩散趋同更是相关领域的研究热点.文中首先介绍多Agent群体行为中的扩散趋同现象,然后根据Agent扩散趋同传递的方式、Agent的扩散趋同能力的分布情况和Agent扩散趋同所感知的范围,将相关研究成果中的扩散趋同机制分为3个方面:层次结构性扩散趋同与群集性扩散趋同、平滑扩散趋同与非平滑扩散趋同、邻域扩散趋同与全局扩散趋同.文中对每种模型的特点进行论述和比较分析,最后指出下一步的研究方向.
网络结构化多Agent系统的任务分配

模式识别与人工智能 , 2012,
Abstract: 网络结构化多Agent系统既包括系统运行的底层物理网络,还包括Agent之间的交互网络。传统的任务分配方式并没有深入考虑到网络结构化的特点。文中首先论述网络结构化多Agent系统中任务分配的特点,介绍和分析基于底层网络拓扑与资源分布的任务分配方式、基于Agent交互网络与资源分布的任务分配方式和基于综合网络情境资源的任务分配方式。然后对相关工作进行综述,并与网络结构化多Agent系统任务分配模型进行比较分析。最后论述该方向的难点和未来要解决的问题。
巯基保护的中空金纳米球
Thiolate-Protected Hollow Gold Nanospheres

许文武,()
- , 2018, DOI: 10.3866/PKU.WHXB201711061
Abstract: 基于全统一模型和密度泛函理论(DFT)计算,我们提出了具有高对称性和稳定性的巯基保护的中空金纳米球Au60(SR)20的原子结构。Au60(SR)20由一个二十面体Au50富勒烯中空笼子(由20个四面体Au4融合构成)和10个[―RS―Au―SR―]订书针结构组成,并遵循“分离和保护”规则。DFT计算表明,这种空心Au60(SR)20纳米球具有大的带隙(1.3 eV)以及在笼中心的核独立化学位移(NICS)为负值(?5),表明其高度的化学稳定性。此外,四面体Au4单元中心的NICS值远大于空心笼中心的NICS值,表明Au60(SR)20的总体稳定性可能来自每个四面体Au4单元的局部稳定性。正的谐波振动频率说明Au60(SR)20纳米球至少是势能表面的局部最小值。另外,我们还通过融合四面体Au4层设计了双层中空金纳米球,表明调整中空金纳米球壳层厚度是可行的。最后,我们还介绍了更大的中空金纳米球Au180(SR)60的设计。这项工作提供了可控设计中空金纳米球的新策略。
We present the atomic structure of thiolate-protected hollow Au nanosphere (HAuNS), Au60(SR)20, with high symmetry and stability based on the grand unified model (GUM; Nat. Commun. 2016, 7, 13574) and density-functional theory (DFT) calculations. Using C20 fullerene (with Ih symmetry) as a template, 20 tetrahedral Au4 units were used to replace the C atoms of C20, and three Au atoms of each Au4 were fused with three neighboring Au4 units by sharing one Au atom to form an icosahedral Au50 fullerene cage as the inner core. Subsequently, the unfused Au atom in each Au4 was bonded with the [―RS―Au―SR―] staple to form the completely hollow Au60(SR)20 nanosphere. Therefore, the Au60(SR)20 is composed of an icosahedral Au50 fullerene hollow cage (constructed by fusing 20 tetrahedral Au4 units) with 10 [―RS―Au―SR―] staples, obeying the "divide and protect" rule. Each Au4 unit has 2e valence electrons, namely, the tetrahedral Au4(2e) elementary block in the grand unified model. The DFT calculations showed that this hollow Au60(SR)20 nanosphere had a large HOMO–LUMO (HOMO: the highest occupied molecular orbital; LUMO: the lowest unoccupied molecular orbital) gap (1.3 eV) and a negative nucleus-independent chemical shift (NICS) value (?5) at the center of the hollow cage, indicating its high chemical stability. Furthermore, the NICS values in the center of the tetrahedral Au4 units were much more negative than that in the center of the hollow cage, revealing that the overall stability of Au60(SR)20 likely stemmed from the local stability of each tetrahedral Au4 unit. The harmonic vibrational frequencies were all positive, suggesting that the HAuNS corresponded to the local minimum of the potential energy surface. In addition, the bilayer HAuNS was designed by fusing the tetrahedral Au4 layers, indicating the feasibility of tuning the thickness of the shell of HAuNS. In bilayer HAuNS, each tetrahedral Au4 unit in the first layer shared four Au atoms, while those in the second layer shared one Au atom. The other three Au atoms of each tetrahedral unit bonded with the SR groups, demonstrating that each tetrahedral Au4 unit has
客户服务知识管理系统应用
黄官伟,
计算机系统应用 , 2000,
Abstract: 本论文从分析客户服务台当前面临的问题出发.指出知识管理系统是一个能为企业克服这些问题的解决方案.并分析了知识管理系统中应用的主要技术。
追随力研究述评与展望
The Research Review and Prospect of Followership
 [PDF]

,, 陈英葵
Advances in Psychology (AP) , 2016, DOI: 10.12677/AP.2016.65079
Abstract:
随着追随力概念的提出,学术界逐渐将研究重心从领导力转向了追随力。有关追随力的研究国外学者起步较早,国内仍处于初级阶段,就其概念和维度,学者们基于不同层面提出了不同的观点,但尚未达成一致。通过对国内外相关文献的梳理,结果发现:1) 追随力的概念仍缺少具有权威性的界定,理论基础相对薄弱,应对其概念作出清晰且权威的界定;2) 追随力研究应逐步从理论研究过渡到实证研究;3) 学者们应致力于追随力量表的开发和完善,以推动实证研究的发展;4) 对内隐追随力的测量考虑采用多视角、间接测量法进行研究;5) 应采用“动”“静”结合的整合视角考察追随力在组织中的作用。
With the mention of the followership, academic circles gradually turn the focus from leadership to followership. The study of the followership started earlier in abroad, it’s still in the primary stage in domestic. Scholars put forward different views based on different layers when involving the concept and dimensions, but a consensus has not yet reached. By combing the relevant literature published on domestic and foreign countries, the result shows: 1) The concept of followership is still lack of authoritative definition and relatively weak in the theoretical basis, so we need to define its concept more clearly and authoritatively; 2) The study of followership should be gradually changed from theoretical research to empirical research; 3) To promote the development of empirical research, scholars should be committed to the development and improvement of the scale of followership; 4) Implicit followership should be measured from multiple perspectives by indirect method; 5) The way of “dynamic” and “static” should be combined to explore the effect of followership in the organization.
地质剖面图中复杂断层的自动生成方法
,李文斌,武强
煤田地质与勘探 , 2010,
Abstract: 为实现地质剖面图中复杂断层的自动生成,通过分析断层数据类型,实现断层数据规范化处理;分析断层自身的基本要素(断点、断距、性质、走向、倾向、与地层的切割、错动关系等),提出采用“复原法”构建单一断层模型的方法;依据复杂断层的空间拓扑关系及其重要性,划分断层级别,理顺断层之间、断层与地层之间的关系,探索出地质剖面图中复杂断层的自动生成方法。通过开滦某煤矿的地质数据验证了该方法的有效性。该方法可依据用户需要,生成任意方向的地质剖面数据,为基于剖面的三维建模提供了充足的原始建模数据。
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