A Comparative Analysis of Co-Operating Enterprises on the Basis of a Growth Matrix

A matrix and submatrix of growth of co-operating enterprises enable fuller investigation of relations between enterprises. They contain relatively important parameters and enable immediate inview into the direct growth of enterprises as well as into their mutual movements. A submatrix of growth represents a general scheme of growth of the ith and jth enterprise and by aid of it, investigations of complex structural relations can be performed. Through the submatrix of growth movements of enterprises can be linked and the following can be investigated: (1) relations of absolute levels of the production of enterprises in different periods, (2) absolute and relative rates of growth of enterprises and (3) direct and indirect elasticities of growth of enterprises. Through these parameters a comparative dynamic and structural analysis of co-operating enterprises can be performed.     

A Stability Analysis of Growth Matrix in Co-operating Enterprises

On the basis of the growth-rate matrix in co-operating enterprises, this study deals with growth stability as well as the possibility of interpolation and extrapolation of a dynamic growth system. This study also suggests an index of growth stability when a new enterprise is introduced: disequilibrium occurs initially, and stability is gradually reached with the passage of time.     

金属矿山企业生产计划优化方法

针对金属矿山企业的单位开采与运输成本大、优化求解结果偏差大问题, 首先, 依据金属矿山企业编制开采计划的基本原则, 以矿石开采与运输成本最小化为优化目标, 利用整数规划方法, 构建了金属矿山企业生产计划数学模型, 其次, 为了精准快速求解金属矿山企业生产计划模型, 提出了改进的量子粒子群优化算法, 采用进化速度和聚集度因子对算法中的惯性权重进行动态调整, 并设计了双层可行域搜索策略, 提高了算法的局部和全局搜索能力。最后, 以某大型金属矿山企业采运生产作业为案例, 通过与矿山实际生产指标、非线性规划结果以及粒子群优化结果进行比较分析。结果表明:在相同经济指标和参数环境下, 本文算法优于其它两种优化方法, 且每吨矿石的开采和运输成本减少了0.05元左右, 降低了金属矿山企业的开采运输成本, 提高了企业的整体经济效益。     

A Matrix Model for the Topological String I: Deriving the Matrix Model

We construct a matrix model that reproduces the topological string partition function on arbitrary toric Calabi–Yau threefolds. This demonstrates, in accord with the BKMP “remodeling the B-model” conjecture, that Gromov–Witten invariants of any toric Calabi–Yau threefold can be computed in terms of the spectral invariants of a spectral curve. Moreover, it proves that the generating function of Gromov–Witten invariants is a tau function for an integrable hierarchy. In a follow-up paper, we will explicitly construct the spectral curve of our matrix model and argue that it equals the mirror curve of the toric Calabi–Yau manifold.     

Special Models of Co-operating Enterprises Based on the Matrix of Growth

On the basis of special matrices of growth various models of co-operating enterprises are considered. The formulation of such models is useful for the expression of specific structural problems as well as for the possibility of extrapolation of system elements into the future. Their common characteristic is that all of them are existing on the "structure of growth" and not on the technical relations of interdependency as is the case in intersectorial analysis.     

中国乡镇企业增长的随机前沿生产函数分析

论文在运用中国1990-2005年间省际平衡面板数据的基础上,采用考虑非效率项的非中性技术进步随机前沿生产函数模型,分析了影响我国各省区乡镇企业增长的规模报酬、技术效率和技术进步因素。主要得出结论如下:在乡镇企业的发展过程中,资本产出弹性不断接近甚至有超过劳动产出弹性的趋势,呈现出一定的资本深化过程;整个规模报酬略大于1,这表明适当扩大乡镇企业经营规模存在着一定的规模经济效应;而整体平均技术效率水平逐年递增,技术进步率则逐年下降。在这些实证工作的基础上,论文还得出一些政策建议,希冀能够对实现我国乡镇企业的可持续发展有所裨益。     

生长曲线模型中回归系数阵的极大似然估计的精确分布

对于生长曲线模型,基于理论发展和应用效果的考虑,本文引入了Gauss型误差．在此误差下,本文研究了模型中回归系数阵的极大似然估计的精确分布,求出了此分布的密度和特征函数．     

Optimal Consumption in a Growth Model with the CES Production Function

Abstract

This article studies the optimization problem of maximizing the expected discounted present value of lifetime utility of consumption in the framework of one-sector neoclassical growth model with the Constant Elasticity of Substitution (CES) production function. We establish the existence of a classical solution of the Hamilton–Jacobi–Bellman (HJB) equation associated with this problem by the technique of viscosity solutions under the strict concavity of the utility function, and hence derive an optimal consumption from the optimality conditions in the HJB equation.     

A Class of Linear Biased Estimators of Regression ParameterMatrix in the Growth Curve Model

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基于矩阵变换的聚类集成优化模型

聚类集成方法能够有效综合不同的聚类结果,提高聚类的精确度和稳定性.提出了一个基于矩阵变换的聚类集成优化模型,模型通过矩阵变换代替传统方法中的聚类配准模式,使得优化模型更加简洁,然后给出了求解该优化模型的叠代算法.实验表明,提出的聚类集成方法能够有效提高聚类集成的稳定性和精确度,并且在聚类数目比较少时,算法有着较低的时间复杂度.     

Logarithmic Growth for Matrix Martingale Transforms

An example is given of an operator weight W that satisfies thedyadic operator Hunt–Muckenhoupt–Wheeden condition for which there exists a dyadic martingale transform on L² (W) that is unbounded. The constructionrelates weighted boundedness to the boundedness of dyadic vectorHankel operators.     

A Dynamic Programming Model for Pig Production

The feeding policy of a pig production unit affects both the cost of production and the weight and carcase composition of the pigs produced. Since the market value of the pigs produced is determined by the weight and composition of the carcase, feeding policy has a major influence on the economic performance of the unit. In order to evaluate possible feeding policies, the effect of feed intake on both the weight and the body composition of the growing pig must be known, and since an optimal policy will involve using least cost rations, it must be possible to determine the least cost rations to produce liveweight gains of specified body composition. A dynamic programming model to determine the optimal feeding policy to produce pigs of specified weight and carcase composition is developed using a published pig growth model which allows the formulation of the required least cost rations, and the use of this dynamic programming model is illustrated.     

A Crystal Growth Approach for Topographical Global Optimization

A new approach for topographical global minimization of a function f(x), x A Rⁿ by using sampled points in A is presented. The globally sampled points are firstly obtained by uniform random sampling or uniform sampling with threshold distances. The point with the lowest function value is used as the nucleus atom to start a crystal growth process. A first triangular nucleus includes the nucleus atom and two nearest points. Sequential crystal growth is continued for which a point next closest to the nucleus atom is bonded to the crystal by attaching to two nearest solidified points. A solidified point will be marked during the crystal growth process if any of two connected points has a lower function value. Upon completion of entire crystal growth process, all unmarked points are then used as starting points for subsequent local minimizations. Extension of the topographical algorithms to constrained problems is exercised by using penalty functions. Formulas for estimation on the number of sampled points for problems with an assumed number of local minima are provided. Results on three global minimization problems by two topographical algorithms are discussed.     

炼油生产调度优化模型研究

本文针对炼油厂一次加工采用原油混烧方式的特点,研究了以满足二次加工质量卡边要求为目标的生产调度优化模型,为保证产品质量的稳定和降低原油成本,研究了原油需求预测模型,并介绍了两个模型求解算法的特点。     

A Model for Predicting the Production Yield of Integrated Circuits

In the production of integrated circuits (I.C.s), the ability to estimate the yield of working devices, or die, is economically important. This yield depends on the distribution of material and processing defects across the surface of the wafer of devices.A number of models have been proposed to explain the distribution of point defects on I.C.s. Most of these models are based on the Poisson distribution for describing the number of defects expected on a die. These models do not inherently allow for dependence between the number of defects expected on two adjacent die.This paper develops a model for generating an I.C. defect distribution that allows for dependence in the number of defects on die that are near one another. The correlation matrix and yields of observed data are found to compare favourably with theoretical results of the proposed dependent model. Simulation results are used to compare the new dependent model to a previously proposed independent model. These dependent-model simulations show defective die clustered near each other on the wafer, a property that has been observed on real wafers. Methods of parameter and yield estimation in the dependent model are discussed.     

油田产量构成的多阶段多目标优化

为了确保中后期原油稳产,如何将油田总产量合理细分到各采油厂成为油田开发规划面临的重要问题.建立了油田产量构成的多阶段多目标优化模型,将油田总产量按照产量构成的类型分配给各分项产量,进一步将各分项产量分配到各采油厂.结果表明,通过多阶段优化,在确保油田总产量稳定提高的同时,油田的总成本在两个阶段都有所下降,油田效益提高;此外,油田总产量目标被细分到了各采油厂的各分项产量,为油田决策者下达具体的产量指标提供了依据,以便油厂根据自身实际优化开发指标,完成油田下达的产量任务.     

具有生产性与福利性公共支出的随机内生增长模型

文章建立一个随机内生增长模型来阐明主要政策参数对经济增长与社会福利的影响.若对生产函数、效用函数、偏好及随机干扰作一些特殊的假设,我们证明了主要政策参数的均衡值能被模型参数唯一决定.进一步我们还得到了期望增长率与储蓄的清晰解.文章的最后,我们证明了政府支出直接影响个体决策者的决策:即提高经济增长率将减少福利;反之,增加福利将减少增长率.