时间相关的单机排序的最坏竞争比分析 (运筹学与控制论)

本文研究了工件的加工时间具有开工时间和加工所在位置相关的单机排序问题。工件的加工时间是序列中加工所在的位置和开工时间的非增函数,目标函数为最小化的误工工件个数和最小化总误工。本文对于所研究的2个目标函数利用Moore-Hodgson算法和EDD规则分别提出的启发式算法,对于目标函数位误工工件个数情形给出了最坏竞争比近似于2,最小化总误工给出非常数的最坏竞争比。进一步如果工件的加工时间和工期具有一致关系,分别给出了2个多项式时间算法。     

时间相关的单机排序的最坏竞争比分析

本文研究了工件的加工时间具有开工时间和加工所在位置相关的单机排序问题.工件的加工时间是序列中加工所在的位置和开工时间的非增函数,目标函数为最小化的误工工件个数和最小化总误工.本文对于所研究的2个目标函数利用Moore-Hodgson算法和EDD规则分别提出的启发式算法,对于目标函数位误工工件个数情形给出了最坏竞争比近似于2,最小化总误工给出非常数的最坏竞争比.进一步如果工件的加工时间和工期具有一致关系,分别给出了2个多项式时间算法.     

基于值域的快速排序法

对实际应用中常见的一类数据给出一个基于值域的快速排序算法．对于给定的Ｎ个数据记录，此算法的最大平均时间复杂度为Ｏ（Ｎ），优于Ｈｏａｒｅ快速排序法，且附加空间远小于Ｎ，也优于Ｈｏａｒｅ快速排序法．最后对几组随机数据进行验证     

两阶段供应链下极小化最大完工时间的单机系列批排序

【目的】考虑单机情况下的加工和运输两阶段的供应链排序问题。【方法】在生产阶段,将所有工件在加工之前划分成批,在一台有限批容量的机器上加工,工件的实际加工时间是关于该工件退化率和加工位置的函数;在运输阶段,有一辆运输车,且每次只能运输一批工件,即车的容量等于批的容量。通过分析用运输车的车容量限制与工件个数的关系。【结果】由最优算法得到了一个最优排序和最小化最大完工时间。【结论】首先给出最大完工时间问题的一个下界,然后指出在当工件个数小于等于运输车的容量限制时,提供出来一个最优算法。对于当工件个数大于运输车的容量限制时,证明了当工件满足一定条件时,该问题也存在最优算法。     

问题1｜S，GT｜∑wj（1—e^—rCj）的最优算法

讨论目标函数为带折扣的加权总完工时间的单机成组排序问题1｜S，GT｜∑wj(1-e^-rCj)，并给出了求解该问题的一个最优算法。     

带有固定区间的双代理排序问题

【目的】研究带有固定区间的双代理排序问题。【方法】第一个代理的工件加工过程可以中断，考虑两种机器类型：单台机器时考虑的目标函数为总权误工损失或总权提前损失；两台平行机时考虑的目标函数为总完工时间，同时必须在规定的固定区间加工第二个代理的工件，目标是在满足第二个代理目标的可行性前提下寻找一个使第一个代理的目标函数值更小的排序方案。【结果】设计了单台机器固定区间工件损失问题的排序算法，也为两台平行机总完工时间问题设计了相应算法。【结论】设计的算法可在多项式时间内得到解决，且证明了算法的最优性，并用数值实验说明了算法的可行性。     

基于全排序与混沌多样性的高维目标进化算法

当前大部分多目标进化算法采用Pareto排序为种群个体指定适应度值;然而随着优化目标个数增加,种群中非支配个体的比例越来越大,造成上述算法的搜索能力迅速下降。针对高维(4个以上)目标优化问题,提出了一种全排序方法;该排序方法与Pareto排序具有一致性,并且能够对非支配解进行比较;因此基于全排序的多目标进化算法不受目标个数增加的影响。为了提高算法的优化效果,设计了一个混沌映射算子,用来周期性地初始化种群,以保证种群的多样性与均匀分布。最后,采用标准测试问题对所提算法与著名的非支配快速排序遗传算法(NSGA2)进行了实验比较。结果表明在高维目标优化问题中,所提算法无论在收敛精度,还是算法运行效率上都高于NSGA2算法。     

Moore-Hodgson算法最优性的新证明

经典排序论中使误工工件的个数为最少的单台机器排序问题,简称为误工问题,是排序论中最基本的问题之一。著名的Moore-Hodgson算法可以在时间O(nlogn)内得到误工问题的最优解。虽然经过改进,然而Moore-Hodgson算法最优性的证明仍然非常复杂。本文给出Moore-Hodgson算法最优性的一个非常简洁的新的证明。由于误工问题在排序论里的重要性,本文给出的新的证明在理论上是有重要意义的,是可以为排序论的专著和教材所采纳的。此外,对于推广的误工问题,例如,某些工件必须不误工的排序问题,或者工件的就绪时间不相同、但是与交货期有"一致性"关系的排序问题,或者工件的加工时间与工件的权有反向"一致性"关系的排序问题等,也可能有简洁的证明。     

一类加工时间与位置有关的单机排序问题

研究一类工件加工时间和位置有关的单机排序问题．在这一问题中。全部工件有一个待定的共同工期d，目标函数是提前时间，延误时间和工期的加权和达到最小，即惩罚函数最小．通过对问题的分析，将其转化为指派问题，从而证明该问题具有多项式算法．并用一个例子作了说明。     

一个成组加工中加工时间可变的加工全程问题

该文考虑在成组加工中工件加工时间受位置影响的单机排序问题．目标函数为极小化加工全程．我们给出了此问题的最优性条件，并且构造了一个最优算法．     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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Brief Introduction to “Journal of Jilin University( Science Edition) ”

<正>"Journal of Jilin University(Science Edition)"is a comprehensive academic journal in the fields of science sponsored by Jilin University and administrated by the Ministry of Education of the Peoples Republic of China.The journal started publication in 1955.The original name at starting publication was"Journal of Natural Science of Northeast People University",which was changed into"Acta Scientiarum Naturalium Universitatis Jilinensis"in 1958 owing to the name change of the university.The present journal name has