动态柔性制造系统仿真平台

针对通常柔性制造系统（FMS）仿真方法在体现制造系统动态变化特性方面的不足，开发了一种FMS的可视化、分布工仿真平台。该平台模拟真实FMS的运行，较好地体现了离散事件动态系统的特性，可以作为调度、控制算法的测试平台。作为示例，在该平台上成功地实现了一种基于遗传算法的FMS动态调度算法，解决了FMS实时运行中各种突发事件下的再调度问题。     

柔性制造系统分布式仿真系统的实现

计算机可视化仿真是对柔性制造系统 ( FMS)进行设计和分析的一种直观而具有实际意义的方法 .利用面向对象方法和离散事件动态系统建模方法 ,设计并实现了一种开放式、可视化 FMS分布式仿真系统 .该系统通过局域网上若干计算机之间的通讯 ,模拟了 FMS自动化生产车间的实时运行状况 ,通过初始化系统数据可得到不同的系统统计结果对 FMS进行分析     

柔性制造系统分布式仿真系统的实现

计算机可视化仿真是对柔性制造系统 (FMS)进行设计和分析的一种直观而具有实际意义的方法 .利用面向对象方法和离散事件动态系统建模方法 ,设计并实现了一种开放式、可视化 FMS分布式仿真系统 .该系统通过局域网上若干计算机之间的通讯 ,模拟了 FMS自动化生产车间的实时运行状况 ,通过初始化系统数据可得到不同的系统统计结果对 FMS进行分析     

基于多Agent的柔性作业车间调度研究

针对多目标柔性作业车间调度问题,构造了基于多Agent的车间调度模型,研究了多Agent之间的交换协调机制．提出一种改进遗传算法并封装在策略Agent中,通过对编码规则、解码算法与交叉、变异算子进行改进,提高了调度优化算法的实用性和优化效果,实现了多目标动态调度,提高了系统的适应性和健壮性．某企业车间应用实例证明其可以满足车间调度高效、稳定的要求．     

一种异步蚁群算法求解柔性作业车间调度问题

调度问题广泛存在于资源共享型系统中,大多数的调度问题都属于混合整数规划问题.大规模混合整数规划问题是计算科学领域中的NP-hard经典问题之一,一般认为无法用精确计算求解.生产调度是调度的一个重要分支,是实现智能制造关键环节之一.针对多品种变批量柔性作业车间调度问题,以最小制造期为优化目标,设计了一种基于Petri网的异步并行蚁群算法,其中:提出了一种基于Petri网的步可达图构造方法,用于蚁群算法解空间的构造;探讨了传统蚁群算法搜索机制,并给出了一种基于异步仿真时钟的蚁群并行搜索方法;仿真结果表明,多线程控制方法可以有效地避免算法的早熟收敛问题.将所提出的算法应用于某安防件智能制造系统的柔性作业车间调度中,降低了系统的总制造时间,获得较好工程效果的同时验证了算法的有效性.     

半导体晶圆制造系统的时变多目标生产调度优化

从当前半导体晶圆制造企业实际生产调度的角度出发,根据模糊控制理论和模拟退火算法,提出了解决半导体晶圆制造系统(SWFS)时变多目标生产调度复杂问题的方法.大量的仿真实验数据证明,该方法可以在求解速度和优化质量间取得平衡,并实现了全局优化效果,为实现SWFS的科学生产控制与调度提供了有效策略和方法.     

基于遗传算法-多智能体的FMS 工件调度研究

针对柔性制造系统（ FMS）一般调度方法的不足,提出基于全局黑板的多智能体调度系统,该系统建立多智能体交互过程,通过多智能体的合作快速建立调度模型,并通过优化模块对调度模型进行求解,从而获得非劣调度方案。在设计优化模块时,采用遗传算法,针对柔性制造系统调度问题的特点,改进并扩展了基于工序的编码方法,引入工序-机器的关系矩阵,从而实现解和染色体的一一对应关系,并设计算法的适值函数、选择方法、交叉和变异方法。仿真结果表明,该调度系统在求解时收敛速度快、精度较高。最后通过10个经典的柔性job-shop调度算例,与单纯使用遗传算法和禁忌搜索算法进行比较,目标值平均改善2.21％和1.04％。     

全连铸生产调度系统仿真模型的建立

对具有离散事件系统特征的全连铸车间生产调度系统，通过建立其仿真模型进行试验，实现了借助计算机仿真全连铸生产过程，编制了相应调度程序软件，给出多种优化调度方案图，可供实际生产调度参考使用。     

基于Petri网和GASA的双资源JSP动态优化调度

以带有控制器的Petri网为建模工具对柔性生产调度中的离散事件建模.该模型不仅能够反映柔性生产线上待加工产品的多条工艺加工路径及其资源约束,还可以对系统的设备维护、各种优先级等特性进行描述.利用遗传算法和模拟退火算法(GASA)获得调度结果,用于解决作业车间在机床、操作工人等生产资源制约条件下的动态优化调度.该调度以生产周期为目标,通过多种交叉、变异、概率更新、再分配策略等遗传和模拟退火操作,得到目标的最优或次优解;尤其重要的是该算法能够在扰动发生后迅速提供新的调度计划.对算法进行了仿真研究,结果表明该算法是可行、有效的.     

集装箱港口集疏运调度系统作业模式的仿真分析

为解决复杂的集装箱港口集疏运系统多阶段动态调度的问题,借鉴柔性制造系统(FMS)生产调度问题的研究方法,提出了由集装箱集疏运问题向FMS生产调度问题转化的方法和模型;分析了各个阶段动态调度的决策点和决策规则,提出了基于规则的方法实现集装箱集疏运系统的实时动态调度,为集装箱码头调度问题的研究提供了新思路和新方法.利用WITNESS仿真工具分别模拟了面向作业线的静态调度和面向作业面的动态调度两种集装箱集疏运调度模式,结果表明,动态调度模式的效率提高了约9.66%.     

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.     

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.     

A computer generator for randomly layered structures

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

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.     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

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.     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with