关于二台机器自由作业的总流程问题

二台机器自由作业的总流程问题是NP困难问题．当加工时间仅依赖于机器时，该问题尚未被解决．本文对于机器均不允许空闲的约束条件下的上述问题，给出了显式解，即最优时间表的构造形式，从而改进了文献中的结果．此外，本文还对允许空闲的上述问题，作了一些讨论，指出了Vakharia和Catay一文（1997）中算法的错误．     

评析

问题153，154来稿较少，暂不评析． 问题 155 该问题共收稿7篇，均认为问题提出者的结论是正确的，可加以逻辑证明．来稿中，江苏省徐州高级中学沈家书、浙江省杭州市长河高级中学许鑫娟给出了与选登1相同的证明，湖北省武汉市黄陂一中高二（17）班喻超同学也参与了对该问题的讨论．     

谈常见曲线切线问题

导数进入中学数学教材之后，给传统的中学数学内容注入了生机与活力，为中学数学问题的研究提供了新的视角、新的方法，拓宽了高考的命题空间．曲线的切线问题是导数的重要应用之一，本文就谈一下与曲线切线有关的问题，供参考．     

并行分批排序问题综述

并行分批排序是兴起于上世纪末的一类新型排序问题，它最初来源于半导体生产中的芯片测试过程，有重要的应用价值，在理论上也有重要的意义．因此，并行分批排序问题近年来受到了越来越广泛的关注，新的研究成果不断涌现．本文就并行分批排序问题的最新进展作了全面的介绍，指出了许多尚未解决的问题和许多新的研究方向，给出了丰富的参考文献，旨在把感兴趣的读者迅速带到此研究领域的前沿．     

合作研发中的钳制问题分析

本文利用新制度经济学理论，从合作研发的角度分析了专用性资产的钳制问题，指出专用性、契约不完全和机会主义是钳制问题产生的原因，分析了钳制问题的作用机理。文章以技术方和投资方的合作研发为例，阐述了技术成果的质量和成本、收益的关系，并对信息不对称条件下，技术方和投资方的钳制问题进行了博弈分析。     

直线与圆锥曲线相交过定点问题的统一性质

如何利用坐标法简化解答，突破思维障碍，文[1]给出了解答问题的关键，获得了“完美”解答，读来颇受益．笔者从该问题的另一角度思考探究，得出直线与圆锥曲线过定点问题的一些性质，并从几何特征出发获得该问题的一般解法．     

敏感性问题抽样调查的应用注记

本文对敏感性问题抽样调查在应用中发现的一些问题作了初步探索，考虑了同时调查多个敏感性问题时，用每个问题分别独立地随机化回答敏感性问题与之配对的另一问题的方法，此时估计每个敏感性问题的相关性，给出了极大似估估计及贝叶斯估计，另外，还考虑了用一次随机化回答几个敏感性问题或与之配对的另几个问题的情形。     

Banach空间中完全广义混合隐似平衡问题的辅助原理和迭代算法

在Banach空间中利用双线性连续泛函F代替内积引进了新的一类完全广义混合隐似平衡问题，引进了F强单调的概念，提出了该平衡问题的广义辅助问题，证明了广义辅助问题的收敛定理，给出了新的算法和由此算法产生的迭代序列的收敛特征．     

浅议数列“周期”的应用

众所周知，数列是一种特殊的函数，函数的性质在数列中的应用是一个很普通的问题，函数中有周期问题，所以数列中也必然有“周期”问题，有些数列问题，表面上看与“周期”无关，但实际上隐藏着周期性，一旦揭示了其周期性，该问题便迎刃而解，下面举数例说明数列周期的应用．     

非Lévy型正交各向异性开口圆柱壳屈曲问题的辛叠加解析解

该文基于笔者提出的辛叠加方法得到了经典解法难以直接获得的典型非Lévy型正交各向异性开口圆柱壳屈曲问题的解析解.首先，基于Donnell薄壳理论建立了正交各向异性开口圆柱壳屈曲问题的Hamilton体系控制方程，然后将非Lévy型边界下的原问题拆分为两个子问题，在Hamilton体系下利用分离变量和辛本征展开等数学手段对子问题进行求解，最后基于原问题边界条件，通过子问题解的叠加求得原问题的解析解.数值算例表明，辛叠加解析解与有限元数值解结果吻合良好.同时，定量研究了长度和厚度等参数对屈曲载荷的影响.相比于半逆解法等传统解析方法，辛叠加方法基于严格的数学推导，无需假定解的形式，可以获得更多类似问题的解析解.     

RECENT PROGRESS ON SPHERICAL HARMONIC APPROXIMATION MADE BY BNU RESEARCH GROUP ——In memory of Professor Sun Yongsheng

As early as in 1990, Professor Sun Yongsheng, suggested his students at Beijing Normal University to consider research problems on the unit sphere. Under his guidance and encouragement his students started the research on spherical harmonic analysis and approximation. In this paper, we incompletely introduce the main achievements in this area obtained by our group and relative researchers during recent 5 years （2001-2005）. The main topics are： convergence of Cesaro summability, a.e. and strong summability of Fourier-Laplace series; smoothness and K-functionals; Kolmogorov and linear widths.     

On a class of self-similar processes with stationary increments in higher order Wiener chaoses

We study a class of self-similar processes with stationary increments belonging to higher order Wiener chaoses which are similar to Hermite processes. We obtain an almost sure wavelet-like expansion of these processes. This allows us to compute the pointwise and local Hölder regularity of sample paths and to analyse their behaviour at infinity. We also provide some results on the Hausdorff dimension of the range and graphs of multidimensional anisotropic self-similar processes with stationary increments defined by multiple Wiener–Itô integrals.     

A REPRESENTATION FORMULA RELATED TO SCHR(O)DINGER OPERATORS

Schr(o)dinger operator is a central subject in the mathematical study of quantum mechanics.Consider the Schrodinger operator H = -△ V on R, where △ = d2/dx2 and the potential function V is real valued. In Fourier analysis, it is well-known that a square integrable function admits an expansion with exponentials as eigenfunctions of -△. A natural conjecture is that an L2 function admits a similar expansion in terms of "eigenfunctions" of H, a perturbation of the Laplacian (see [7], Ch. Ⅺ and the notes), under certain condition on V.     

On a class of Riemann surfaces

It is considered the class of Riemann surfaces with dimT1 = 0, where T1 is a subclass of exact harmonic forms which is one of the factors in the orthogonal decomposition of the spaceΩH of harmonic forms of the surface, namely The surfaces in the class OHD and the class of planar surfaces satisfy dimT1 = 0. A.Pfluger posed the question whether there might exist other surfaces outside those two classes. Here it is shown that in the case of finite genus g, we should look for a surface S with dimT1 = 0 among the surfaces of the form Sg\K , where Sg is a closed surface of genus g and K a compact set of positive harmonic measure with perfect components and very irregular boundary.     

CONTENTS OF VOLUME 30

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Instructions for contributions

正Applied Mathematics-A Journal of Chinese Universities,Series B(Appl.Math.J.Chinese Univ.,Ser.B)is a comprehensive applied mathematics journal jointly sponsored by Zhejiang University,China Society for Industrial and Applied Mathematics,and Springer-Verlag.It is a quarterly journal with     

Journal of Mathematical Research with Applications Guide for Authors

正Journal overview:Journal of Mathematical Research with Applications(JMRA),formerly Journal of Mathematical Research and Exposition(JMRE)created in 1981,one of the transactions of China Society for Industrial and Applied Mathematics,is a home for original research papers of the highest quality in all areas of mathematics with applications.The target audience comprises:pure and applied mathematicians,graduate students in broad fields of sciences and technology,scientists and engineers interested in mathematics.     

Staircase transportation problems with superadditive rewards and cumulative capacities

A cumulative-capacitated transportation problem is studied. The supply nodes and demand nodes are each chains. Shipments from a supply node to a demand node are possible only if the pair lies in a sublattice, or equivalently, in a staircase disjoint union of rectangles, of the product of the two chains. There are (lattice) superadditive upper bounds on the cumulative flows in all leading subrectangles of each rectangle. It is shown that there is a greatest cumulative flow formed by the natural generalization of the South-West Corner Rule that respects cumulative-flow capacities; it has maximum reward when the rewards are (lattice) superadditive; it is integer if the supplies, demands and capacities are integer; and it can be calculated myopically in linear time. The result is specialized to earlier work of Hoeffding (1940), Fréchet (1951), Lorentz (1953), Hoffman (1963) and Barnes and Hoffman (1985). Applications are given to extreme constrained bivariate distributions, optimal distribution with limited one-way product substitution and, generalizing results of Derman and Klein (1958), optimal sales with age-dependent rewards and capacities.To our friend, Philip Wolfe, with admiration and affection, on the occasion of his 65th birthday.Research was supported respectively by the IBM T.J. Watson and IBM Almaden Research Centers and is a minor revision of the IBM Research Report [6].     

Boundedness for commutators of multipliers on Hardy type spaces

In this paper, we study the commutators generalized by multipliers and a BMO function. Under some assumptions, we establish its boundedness properties from certain atomic Hardy space Hb^p（R^n） into the Lebesgue space L^p with p 〈 1.