问题
- 与 问题 相关的网络例句 [注:此内容来源于网络,仅供参考]
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The text introduces the probability of random events and issues of counter-examples; discrete random variables related to the distribution and continuous random variable distribution of counter-examples; independence and related issues in the Phase capacitive on the counter-examples; number of characteristics of the random variable The counter-examples of; parameters estimates and assumptions in the anti-testing case of problems.
该文主要介绍了随机事件及其概率问题中的反例;有关离散型随机变量分布和连续型随机变量分布中的反例问题;独立性与相关性相容性问题中的反例介绍;有关随机变量数字特征的反例探讨;有关参数估计与假设检验中的反例问题。
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The theory of "continuum of problem types" supplied a good frame for designing questions in class,"Five Why" question design ing methods played a important role in increasing practice of question design ing.
问题类型连续体"理论为课堂教学问题设计提供了框架",五何问题设计方法在增加问题设计的可操作性方面起到了重要作用。
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PSO is a population-based optimization algorithm, which mimics the social behavior of animals in a flock. It makes use of individual and group memory to update each particle position allowing global and local search optimization. The objective function considered was the total weight of the structure subjected to stresses, displacements and forces constraints. The effects of the parameters were investigated as well and such combination of tuning parameters promote a better global search behavior avoiding premature convergence while rapidly converging to the optimal solution. Results showed the effectiveness of the proposed method by comparing with ANSYS Design Optimization Tool (zero-order method). The PSO with the tuning parameters makes it an ideal method for offshore wind turbines foundations optimization tasks.(2) A reliability analysis method for pile foundation bearing axial loads based PSOThe performance function of pile foundation's axially bearing capacity sometimes is nonlinear and complex, on the basis of geometric meaning of structural reliability index, an optimum model with PSO for structural reliability analysis under arbitrary random variables was established, The PSO algorithm is very efficient to solve global optimization problemsIts use in structural reliability field presents not only the advantage of its facility of implementation, but also the possibility to obtain the design point and the failure probability with a good accuracy. In addition, PSO is a zero order algorithm, for no derivative is necessary for its implementation.
本文的研究针对桩式海上风机基础结构的特点,在国内外有关研究成果的基础上对海上风机基础结构优化设计理论和可靠度方法一些相关问题进行了较为深入的研究,具体做了以下几个方面的工作:(1)基于粒子群优化的桩式海上风机基础确定性优化设计方法桩式海上风机基础的优化设计是一个复杂的、非线性约束的优化问题,针对传统的基于梯度信息的优化方法在处理非线性问题中易陷入局部最优解的问题,本文将一种耦合惩罚函数的PSO算法引入到海上风机基础结构概念设计中,PSO算法是从群体动物聚集觅食这一活动中受到启发而发展的,该算法利用个体和群体的信息共享不断改进自身的位置从而进行局部和全局最优搜索,本文中以桩和三脚架连接段直径及壁厚为设计变量,以基础总重量作为优化的目标函数,在给定的约束条件下建立了三脚架基础优化数学模型,另外本文还研究了PSO参数变化对结果的影响,协调的参数组合可以避免陷入早熟收敛而能够快速的获得全局的最优解,通过与ANSYS优化模块的计算结果比较验证了该方法的有效性,本方法为海上风机基础的确定性设计提供了一条有效的途径。
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This article incorporates robustness into a general convex conic optimization problem and shows its deterministic equivalence under the D-duality framework, in which one needs only to compute a D-induced convex cone, which is generally difficult.
本文把不确定性考虑进凸锥最优化问题,在D-对偶理论的框架内把原问题的确定性等价问题表示出来了。对于这样的问题,我们只要计算一个D-对偶锥就可以了。
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As a result, it shows thatthe static or dynamic subsystem optimum alone is not equal to the system optimum. Three initial value problems met in the optimal design of flying vehicle are studied andconclusions are derived that: orthogonal test method can be adopted to decide the initial valueof static optimization problem, some mathematical techniques can be used to deal with thecostate variables of Maximum Principle and decide the initial value of the costate variable,the indirect method can be used to get the analytical solution under ideal case to guide thechoice of the initial control curve in the direct method. With some numerical examples oftrajectory optimization, it shows that all these methods are useful not only in accelerating theconvergence but also in converging to the global optimum.
针对飞行器优化设计中的三种初始值问题进行了研究,以远程弹道导弹弹道的工程优化为例说明,对于静态优化问题,采用正交试验法选取初始值,不仅可以大大加快收敛的速度,而且更有可能收敛到全局最优解;以气动力辅助变轨问题为例说明,用共态变量的一阶泰勒级数展开可以解决极大值原理中共态变量初值难于确定的问题;以二级弹道导弹的主动段弹道优化为例说明,利用间接法在理想情况下得到的解析解来指导直接法初始控制曲线的选择,将大大有利于提高直接法的收敛速度。
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In fact most Apriori which has gained association Rules suppose whither time or place is effective for ever, but this can"t solve some impersonal problem in morden life, iradionary association Rules in a general way can answer some question for example, there are 90 percent people buy sugar of who buy creamery ,but they can"t answer such question for example the people who buy creamery, but they cant answer such question for example the people who buy creamery of counter one today but there are 90 percent will buy sugar of counter two, moreover, such problem sometimes is the person of decision-making concerned thing because many things have relation with the factor of time and space, so it need consider the factor of time and space in date.
大多数算法得到的关联规则事实上都假定无论是时间还是地点都是永远有效的,但这并不能彻底解决现实生活中的许多客观问题。传统的关联规则一般可以回答诸如"购买了牛奶的人有90%购买了糖"之类的问题,但是不能回答"今天购买了柜台1中牛奶的人明天有90%购买了柜台2中的糖"之类的问题,而这类问题也往往是决策者在实际中所关心的。
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Some of these questions are brought by Web software, such as the cross-platform and cross-language problems.
这些问题中,有些是网络软件本身固有的问题,如跨平台跨语言的问题,软件复用的问题等。
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Added the current connection system icon on the top bar.
v1.22更新:-显示约会项目增加到最高6条-增加设置更改显示未来多少天内的约会-增加设置更改约会显示的日期格式-点击约会详细会临时缩短约会显示为1,再次点击可恢复-增加全屏电池状态的显示设置(可设置充电中显示/不显示/总是显示)-标题栏增加当前连接系统图标-增加:当笔触离开时解锁(仅对Diamond有效)-再次修复在一些设备上无法显示约会的问题-再次修复在一些设备上导致的偶然性的额外电量消耗问题-再次修复唤醒设备时S2U2无法聚焦的问题-修复了一些小问题原文如下
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This paper has given a thorough investigation into the application of BP neural network to gravitational density interface inversion as well as the implementation of wavelet theory in potential field decomposition and, on such a basis, analysed and evaluated the prospect of applying wavelet neural network to the inversion of gravitational and magnetic data.
重磁数据处理是地球探测与信息技术学科中重磁方法、理论在生产实践工作中的重要环节,其中反演问题和位场分离除了具备自身的作用外,两者并不是截然分开的。位场分离可以为反演问题提供更加可靠的先验信息,对提高反演精度具有一定的作用。反演问题是地球物理的核心问题。增
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The demarcation is one of the basic issues of science and technology philosophy, which is a long-standing controversial issue, and we must face to it.
科学与技术的划界问题是科学技术哲学的元问题之一,是科学技术哲学界必须正视的问题之一,也是一个久有争议的问题。
- 推荐网络例句
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Finally, according to market conditions and market products this article paper analyzes the trends in the development of camera technology, and designs a color night vision camera.
最后根据市场情况和市面上产品的情况分析了摄像机技术的发展趋势,并设计了一款彩色夜视摄像机。
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Only person height weeds and the fierce looks stone idles were there.
只有半人深的荒草和龇牙咧嘴的神像。
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This dramatic range, steeper than the Himalayas, is the upturned rim of the eastern edge of Tibet, a plateau that has risen to 5 km in response to the slow but un stoppable collision of India with Asia that began about 55 million years ago and which continues unabated today.
这一引人注目的地域范围,比喜马拉雅山更加陡峭,是处于西藏东部边缘的朝上翻的边框地带。响应启始于约5500万年前的、缓慢的但却不可阻挡的印度与亚洲地壳板块碰撞,高原已上升至五千米,这种碰撞持续至今,毫无衰退。