联遗传数字与DNA的数字模型

本文提出了三联遗传数字,三联变异数字,联遗传数字,联变异数字及互三联遗传数字等数学新概念。并对n个三联遗传数字链,n个三联遗传数字链的2种逐级收敛及逐级收敛的路径等作了重要的论述。旨在构建DNA与RNA的数字模型。     

牛顿力学所蕴含的价值观分析

牛顿力学认为外力能够克服物体惯性,并且人是力的主体,进而这运动为人力的作用。对牛顿力学进行了介绍,并从力的价值、人力的价值、人的价值三个方面对牛顿力学所蕴含的价值观分析进行了总结,使人们了解到牛顿力学的意义与价值。     

审计数据转换技术(二)

(接上期) 日期/时间格式的转换 因为大多数系统都采用许多不同的日期和时间格式,所以在审计软件中几乎都要进行日期和时间格式的转换,将它转换成审计软件处理所需的统一格式.这可以通过手工程序编码来完成.它能把一个日期或时间字段拆成几个子部分,然后再将它们拼成想要的格式和字段.然而大多数审计软件中的数据导入和转换工具都提供了日期和时间格式之间转换的设置,采用手工编码的情况就比较少了.     

三对角线性方程组解法的研究

通过三对角线性方程组的两类解法讨论二阶常微分边值问题。第一类是直接法,即Gauss消元法,在没有舍入误差的假设下,直接方法在有限步产生方程的解。第二类是迭代法：Jacobi迭代、Gauss-Seidel迭代和SOR迭代,它按一定的格式逐次递推求出方程组的近似解,当然,近似解序列收敛的方法才能被采用。对三对角方程组而言,尽管迭代法程序比较简单,但迭代法的效率不如直接法。     

学习型组织在车间的运用与效果

上海汽车集团三车间,是一个由热处理与磨加工两个生产性质不同的车间合二为一的。它们都具有各自特色,在许多方面存在差异,管理一个新车间是有相当难度的。根据车间自身特点,三车间在创建《学习型组织》中把建立共同远景作为自我修炼的第一步,建立一个“学习气氛浓厚,应变能力强的车间”作为第一个阶段     

名人理财趣闻

牛顿算不准股市的疯狂 大名鼎鼎的牛顿也曾做过股民。1711年，有着英国政府背景的英国南海公司成立，并发行了最早的一批股票。当时人人都看好南海公司，其股票价格从1720年1月的每股128英镑左右迅速攀升，涨幅惊人。当年4月，牛顿用大约7000英镑左右的资金购买了南海公司的股票，很快他的股票就涨起来了，仅仅两个月左右，比较谨慎的牛顿把这些股票卖掉后，竟然赚了7000英镑。     

锵锵三车行

将太多的狂野气质轻轻收敛,将更多的柔美风情悄悄融合,SUV进城了!究竟谁能够真正笑傲江湖,统领城市SUV,三车行,有看头。我们今天驾驭的这三个主角可谓个个身怀绝技,它们中有曾经的城市SUV鼻祖RAV4,有一度独领风骚的＂大众偶像＂CR-V,更有发动＂流体＂攻势的未来新秀ix35。新旧对比间优势互现,结果如此耐人寻味,请翻页     

样条函数在经济技术数学模型中的应用

笔者在贵刊上发表的题为《数值逼近在经济技术数学模型中的应用》一文中,曾就某经济问题向读者较详细地介绍了Lagrange(拉格朗日)、Aitken (埃特金)、Newten (牛顿)插值法,并指出交错使用三种方法的优越性。同时指出,它们的最大缺点是当数据很多时,采用上述三种方法所建立起来的插值多项式次数高、计算较为复杂、稳定性差。并建议采用样条插值法去克服上述问题。本文将介绍如何采用样条函数去解决这一问题的。     

长沙最牛钉子户：一个尚未完结的故事

长沙市新开张的新大陆银座商城外，三栋破旧的门面房格外引入注目。在身边几十个“邻居”相继被夷为平地后，它们依然坚硬地矗立在繁华商业区。三年过去了，拆迂户与开发商之间的补偿争议仍在继续。     

《党政机关公文格式》缺憾瑕疵探析

在对《党政机关公文处理工作条例》(以下简称新《条例》)和《党政机关公文格式》国家标准(以下简称新《格式》)的学习贯彻过程中,笔者曾先后撰写数篇文章,对新《条例》和新《格式》作出积极评价,也曾针对新《条例》存在的缺憾瑕疵进行了专题研讨(见《秘书》2013年第4期)。笔者以为,新《格式》与新《条例》一样,具有以往同类     

A supply chain network equilibrium model with a smoothing newton solution scheme

ABSTRACT

Considering that a supply chain comprises several independent decision makers, a supply chain network equilibrium model that consists of manufacturers, retailers and consumers is developed. After analysing the optimal conditions of various decision makers in the model, the equilibrium condition is established as an equivalent, finite-dimensional variational inequality formulation and is solved by a smoothing Newton method. The global and quadratic convergence of the method is established. The numerical results show the rapid convergence of the method. Additionally, the rapid convergence of the smoothing Newton method is beneficial when solving a complicated network model in the real world.     

An iterative method for determining the internal rate of return

This paper presents an alternative to the usual iterative method for determining the approximate internal rate of return in capital budgeting. The method developed is based on the standard numerical analysis technique of successive approximations or iterations. The iterations converge to the true internal rate of return provided only that the initial cash outflow is greater than the salvage value. A comparison is made of the rates of convergence of the iteration method, Newton's method and the bisection method. Under certain restrictive conditions, the payback reciprocal is seen to play an important role in all three methods.     

On maximum likelihood estimation of stochastic frontier production models

The iterative algorithm suggested by Greene (1982) for the estimation of stochastic frontier production models does not necessarily solve the likelihood equations. Corrected iterative algorithms which generalize Fair's method (1977) and solve the likelihood equations are derived. These algorithms are compared with the Newton method in an empirical case. The Newton method is more time saving than these algorithms.     

耦合Sylvester矩阵方程的梯度迭代算法

通过推广求解矩阵方程AX=b或AX+XB=C的递推迭代算法和基于递阶辩识原理的思想,给出了求解广义耦合矩阵方程的梯度迭代算法。并证明了迭代算法的收敛性。分析表明,若矩阵方程有唯一解,则对任意的初始值该算法给出的迭代解都能快速的收敛到其精确解。数值实例验证了该算法的有效性。     

基于C语言数学计算器设计算法探讨

本文讲述了运用C语言来编写求一元二次、一元三次和多元线性方程的解的思路方法。首先对每个功能方法的原理进行阐述,最后我们对计算出来的结果进行了检验。在方程中,我们用到公式法、牛顿切线法、雅可比迭代法和高斯-赛德尔迭代法。     

悬索桥空缆状态数值分析

本文主要介绍悬索桥空缆状态数值分析方法。主要包括:基于无应力状态分析法和悬链线理论求解悬索桥空缆线形的数值迭代方法;等高、不等高悬链线求解方法及利用matlab编制相应程序实现空缆线形数据的求解。     

A service-based framework for pharmacogenomics data integration

Data are central to scientific research and practices. The advance of experiment methods and information retrieval technologies leads to explosive growth of scientific data and databases. However, due to the heterogeneous problems in data formats, structures and semantics, it is hard to integrate the diversified data that grow explosively and analyse them comprehensively. As more and more public databases are accessible through standard protocols like programmable interfaces and Web portals, Web-based data integration becomes a major trend to manage and synthesise data that are stored in distributed locations. Mashup, a Web 2.0 technique, presents a new way to compose content and software from multiple resources. The paper proposes a layered framework for integrating pharmacogenomics data in a service-oriented approach using the mashup technology. The framework separates the integration concerns from three perspectives including data, process and Web-based user interface. Each layer encapsulates the heterogeneous issues of one aspect. To facilitate the mapping and convergence of data, the ontology mechanism is introduced to provide consistent conceptual models across different databases and experiment platforms. To support user-interactive and iterative service orchestration, a context model is defined to capture information of users, tasks and services, which can be used for service selection and recommendation during a dynamic service composition process. A prototype system is implemented and cases studies are presented to illustrate the promising capabilities of the proposed approach.     

Equilibrium dynamics in an aggregative model of capital accumulation with heterogeneous agents and elastic labor

The paper extends the canonical representative agent Ramsey model to include heterogeneous agents and elastic labor supply. The welfare maximization problem is analyzed and shown to be equivalent to a non-stationary reduced form model. An iterative procedure is exploited to prove the supermodularity of the indirect utility function. Supermodularity is subsequently used to establish the convergence of optimal paths.     

数值保角变换的新算法

保角变换理论在流体力学等许多领域中有着广泛的应用。但计算保角变换是个很困难的问题,因此寻求一种有效方法计算保角变换在实际应用中具有很大意义。本论文提出了一种数值保角变换的新算法,在这个新算法中我们在改进高斯消去法的基础上利用模拟电荷法计算新的电荷点,进而构造高精度的近似保角变换函数,并且通过典型图形的数值实验检验了新算法的有效性。     

梯形明渠正常水深和临界水深的迭代计算法

图解法和试算法是计算正常水深和临界水深通常采用的方法,但计算精度欠佳且计算步骤繁杂。文章提出了一个新的迭代方程用于上述2种水深的计算,并用代数方法严格地证明了该方程具有收敛性。