搜索结果: 1-15 共查到“知识库 计算数论”相关记录25条 . 查询时间(2.157 秒)
非结构网格二阶有限体积离散方法广泛应用于计算流体力学工程实践中,研究非结构网格二阶精度有限体积离散方法的计算精度具有现实意义. 计算精度主要受到网格和计算方法的影响,本文从单元梯度重构方法、黏性通量中的界面梯度计算方法两个方面考察黏性流动模拟精度的影响因素. 首先从理论上分析了黏性通量离散中的“奇偶失联”问题,并通过基于标量扩散方程的制造解方法验证了“奇偶失联”导致的精度下降现象,进一步通过引入差...
基于属性签名的属性远程证明方案
可信计算 远程证明 属性证明 属性基签名
2018/7/4
可信计算中的远程二进制平台完整性证明方式存在平台（软，硬件）配置泄露问题，导致针对性攻击、差别化服务和匿名性破坏。提出利用属性基签名（attribute based signature，ABS）构造远程证明中的属性证明方案（property based attestation，PBA）。将属性签名中的签名策略（属性树）映射到远程证明中的安全属性。利用属性签名的匿名性的特点，验证者无法得知证明方的具...
混合式CRP面元法计算对比
混合式CRP 面元法 整体计算模型 迭代计算模型
2019/1/2
目前，对于混合式CRP（contra-rotating propeller）的数值研究大部分是基于黏流方法，这主要是由于混合式CRP组成构件较多，运用势流方法求解存在一定的困难.但势流方法求解效率较高，在混合式CRP的设计方面，具有独特的优势.为建立混合式CRP的高效数值分析方法，从而为混合式CRP的设计工作奠定基础，研究首先将混合式CRP分成前桨和吊舱推进器两部分，以单个螺旋桨面元法和吊舱推进器...
STACER伸展变形的一种计算方法
伸展机构 薄壁钢带 大应变大挠度 变分方法
2019/1/2
STACER是一种航天器上广泛应用的伸展机构，其储能部件由薄壁钢带经冷加工涡卷最终成型为螺旋管状.由于伸展长度可达装载高度的几十倍，钢带在展开过程中呈现为大挠度、大应变形变，机构伸展力的计算必然涉及强非线性问题；同时，钢带的构型、边界条件在伸展过程中不断变化，这些因素又增加了问题的难度，致使常用的商业软件已无法直接处理此类问题.此研究工作应用变分方法的思想，以研究钢带变形的几何特性为基础，构造出钢...
Fast computation of optimal contact forces
Calculation of point-contact friction model power optimization problem semidefinite programming
2015/8/10
We consider the problem of computing the smallest contact forces, with point-contact friction model, that can hold an object in equilibrium against a known external applied force and torque. It is kno...
One interesting application of Theorem 0.1 is given in [DG, x3], where it is used to analyze the niteness
of the number of solutions to certain generalized Fermat equations. Another application of T...
This
basis is de ned as being dual to the standard intertwining operators. He remarked
(p.402) that it was an unsolved and apparently dicult problem to compute this
basis explicitly. For his appli...
借鉴自然界群居生物的搜索行为模式, 提出一种群体区域搜索算法. 该算法在优化过程中逐步收缩个体搜索半径并进行适度随机调整, 引入巡游追随机制, 以一种简单而自然的方式有效地实现了算法广域探索能力与局部开发能力之间的平衡. 算法结构简单、易实现, 易与其他算法相结合. 通过6 个典型测试函数的实验结果表明, 该算法全局优化能力强、收敛精度高、稳定性好、总体性能优, 适用于复杂函数优化问题的处理.
A Fast Classification Method for Single-Particle Projections with a Translation and Rotation Invariant
Classification Fourier transform Translationand rotation invariant Secondary-class.
2012/8/7
The aim of the electron microscopy image classification is to categorize the projection
images into different classes according to their similarities. Distinguishing images
usually requires that the...
Operations on polytopes: application to tolerance analysis
Three dimensional Dimension Chain Geometric Specification Contact Specification Functional Requirement Polytope Tolerance.
2011/9/29
This article presents numerical methods in order to solve problems of tolerance analysis. A geometric specification, a contact specification and a functional
requirement can be respectively character...
Perturbation approach to multifractal dimensions for certain critical random matrix ensembles
multifractal dimensions Perturbation random matrix ensembles
2011/7/6
Fractal dimensions of eigenfunctions for various critical random matrix ensembles are investigated in perturbation series in the regimes of strong and weak multifractality. In both regimes we obtain e...
Radial extension of a bi-Lipschitz parametrization of a starlike Jordan curve
Radial extension bi-Lipschitz parametrization
2010/11/24
In this paper we discus the radial extension $w$ of a bi-Lipschitz parameterization $F(e^{it})=f(t)$ of a starlike Jordan curve $\gamma$ w.r. to $0$. We show that, if parameterization is bi-Lipschitz,...
A Coder-Decoder model for use in Lossless Data Compression
A Coder-Decoder model Data Compression
2010/11/24
This article describes a technique of using a trigonometric function and combinatorial calculations to code or transform any finite sequence of binary numbers (0s and 1s) of any length to a unique set...
Let $\{X_t, t \geq 1\}$ be a sequence of identically distributed and pairwise asymptotically independent random variables with regularly varying tails and $\{ \Theta_t, t\geq1 \}$ be a sequence of pos...
Rational approximations to values of Bell polynomials at points involving Euler's constant and zeta values
Bell polynomials Euler's constant zeta values
2010/11/22
In this paper, we present new explicit simultaneous rational approximations converging sub-exponentially to the values of Bell polynomials at the points of the form $(\gamma, 1! (2a+1)\zeta(2), 2!\zet...