基于NSGAⅡ的生产线缓存与设备布局协同优化

为解决因布局过程忽略或粗略设置缓冲区占地面积而造成的生产拥挤或空间浪费问题,针对缓存配置与设备布局问题展开协同优化.基于连续时间Markov随机过程原理建立排队网节点状态模型,求解生产线设备平均利用率.以设备利用率、物料搬运距离和占地面积为优化目标,建立缓存配置与设备布局协同优化模型.通过改进的NSGA-Ⅱ算法对该模型进行优化.最终,通过某柴油机缸体生产线实例验证了本文提出方法的有效性.     

闸室船舶组合优化动态模型

基于心理学理论,对待闸船舶提出了极限等待时间的概念.提出将船舶按照特大型、大型、中型、小型设立排队队列,并基于0-1规划建立闸室船舶组合优化动态模型.以泰州船闸某一天上行过闸为例,应用闸室船舶组合优化动态模型对其进行优化调度.结果表明,优化后总闸次数、平均每闸吨位、船舶平均待闸时间、平均闸室利用率等指标比优化前均有了不同程度的改善.     

基于改进三阶段法的快速出口滑行道转出位置的确定方法研究

快速出口滑行道的设置是一种既经济又有效的用于提高跑道容量的方法,对提高机场运行效率有重要意义。论文将飞机自跑道入口至接地转出划分成三个阶段,分别为空中段、减速段与转出段。在分析三个阶段对应长度影响因素的基础上,针对某机场运行的典型机型,运用三阶段法对不同风力负荷条件下各阶段长度进行计算,最后引入机型累计运行比例的概念,确定快速出口滑行道的最终转出位置及条数,总结了三阶段法的计算步骤。实例验证该方法的可行性,对机场平面设计有一定的借鉴价值。     

基于满意优化的电动汽车充电站选址

充电站选址是当前电动汽车推广中面临的首要问题.基于满意优化理论,提出了电动汽车用户满意度评价函数;通过引入充电站等级概念,以平均电动汽车用户满意度最大为目标函数,建立了多等级电动汽车充电站选址的混合整数规划模型,并提出了基于免疫算法的模型求解算法.测试结果表明,该模型可以有效地确定充电站的位置、等级及服务区域,并且其求解算法是快速、有效的.     

采用定性坐标的位置表达及主方向关系推理

针对现有的位置关系表达模型均面向点对象,提出了定性直角坐标的概念,基于此概念提出了一种平面区域对象位置关系表达模型,该模型通过记录主对象与参考对象的定性位置区域的交集是否为空,由此构造位置矩阵来表达区域对象间的位置关系,从而较好地反映了对象的形状及对象间的空间布局,可有效地表达区域对象间的位置关系,并通过定性坐标将方向和距离关系有机地结合在一起形成统一的表达和推理模型.为了提高主方向关系推理的精度,基于该模型又提出了一个主方向关系推理算法,并对其正确性进行了验证.理论分析和实例验证的结果表明,该算法降低了推理的不确定性,提高了推理的精度.     

多级保障系统的广义随机Petri网建模与分析

针对多级保障系统的建模及其优化问题,基于广义随机Petri网建立了三级维修二级库存保障系统的工作流模型. 根据不同等级的维修工作流,提出了广义排队时间的概念,运用扩展的排队模型分析各维修流程的性能等价时间. 为了保证单元的可用度,提出了以最小化缺货次数为目标的优化策略. 采用随机Petri网分析方法对模型进行规约优化,并构造同构的马尔可夫链,求解稳定状态概率分析系统性能,获得一种单元可用度的新计算方法.     

基于改进的粒子群优化的云计算资源调度模型

针对云计算系统中多任务并发模式下引发的资源竞争,本文提出了一种基于改进的粒子群优化的云计算资源调度分配模型,以提高资源利用率.首先,对云计算系统中的资源调度问题进行形式化描述,构建以任务的总完成时间为优化对象的目标函数.其次,求解时采用粒子群优化算法,为保证收敛速度且避免粒子群在搜索过程中陷入局部最优,定义了惯性权重函数.另外,引入一个调整算子以优化位置更新.仿真结果表明,本文提出的资源调度分配模型能够有效提高云计算资源利用率,大幅减少任务的处理时间.     

氧化锆陶瓷车削刀具几何参数的多目标优化

通过氧化锆车削试验测得切削力和刀具磨损量,以工件材料去除量与刀具磨损量的比值作为刀具利用率的量化指标.采用粒子群算法改进BP神经网络,并以此对单因素试验值进行训练预测.采用最小二乘拟合,建立刀具利用率和切削力关于各刀具几何参数的一元模型,以相关系数检验模型的可靠性.基于一元模型,分别提出了刀具利用率和切削力关于刀具几何参数的多元模型.利用粒子群算法结合正交试验值对多元模型进行优化求解,并通过验证试验证明了多元模型具有较高的精度.将多元模型作为目标函数,以刀具利用率最大和切削力最小为优化目标,基于粒子群算法进行了刀具几何参数的多目标优化,验证试验结果表明优化得到的刀具几何参数是合理的.     

基于概念格的聚类分析

针对如何快速有效地在信息管理系统中建立基于概念格模型的聚类分析进行研究,提出在数据库中保存格节点的概念格物理模型、最小基数格模型和最小基数格节点的生成方法,并用以解决产品间的快速比较、相近产品替代等问题.     

基于四维消耗的公交线网优化模型及蚁群算法

针对城市公交线网的优化问题,应用四维消耗概念进行了综合研究,给出了公交线网优化的多目标线性规划模型及蚁群算法.在定义时间、空间、环境、能源等四维消耗概念的基础上,从点、线、面3个方面对公交线网优化问题进行研究.在考虑效益最大化、成本最小化、发展可持续化的情况下,利用效用函数建立了公交线网优化的多目标线性规划模型.并用蚁群算法对多目标线性规划模型求解,得到最佳的公交线路网络布局结构和公交线网运营效率.实例表明,利用蚁群算法优化后公交线网利用率增大、可达性良好、乘客出行时间减少,优化结果符合城市交通的实际情况,该方法合理可行.     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

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.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

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-