一种基于模糊规则遗传算法在车间布置中的应用

提出了一种将模糊控制规则引入遗传算法的方法．根据每一代种群中所有个体适应度值的变化，对交叉概率、变异概率和染色体交叉长度进行模糊调整，很好地抑制了遗传算法的早熟现象，提高了搜索的效率．归纳出模糊调整规则，并叙述了应用模糊规则对交叉概率、变异概率和染色体交叉长度进行调整的策略；给出了模糊控制器的设计．用该模糊遗传算法对制造系统中的车间布置问题进行了仿真．结果表明，该算法是一种效率很高的寻优方法．     

互联电力系统AGC的模糊和遗传控制算法

针对互联电力系统自动发电控制(AGC)，结合模糊控制和遗传算法提出一种新型的PID智能控制器，这种控制器主要特点是选用遗传算法整定的PID参数值作为模糊自整定PID参数控制器的初值，然后再对模糊控制的相关参数用遗传算法优化，避免了参数选择的盲目性。仿真结果明显优于传统的PID控制器，同样也优于单独模糊PID控制器和由遗传算法寻优而设计的PID控制器。同时，在研究遗传算法寻优的过程中提出一种新的适应度选择方法。     

基于遗传算法的水轮发电机组模糊调速器的研究

针对水轮机调节系统模糊控制存在的问题 ,结合遗传算法在水轮机组控制中的应用现状 ,提出了一种采用遗传算法在线优化模糊隶属度函数的方法。仿真结果表明 ,该方法可以自适应地跟踪控制对象的参数变化 ,有效地对模糊控制器进行在线优化 ,从而为水轮发电机组的在线智能控制提供了一条有效途径     

一种改进的两代竞争遗传算法

两代竞争遗传算法改变了简单遗传算法的选择机制，提高了搜索效率．但是两代竞争遗传算法易出现早熟现象，局部寻优能力并未改善．针对这些问题作者提出了一种改进算法，通过变异概率和交叉、变异范围的自适应调整，改善两代竞争遗传算法的搜索性能．实验表明，改进算法克服早熟现象，且能提高算法的局部寻优能力．     

自适应遗传算法在PID控制参数优化中的应用

针对传统的PID控制中参数整定的难题，采用智能控制技术优化PID参数，利用神经网络进行系统辨识，建立对象模型；在此模型基础上，运用遗传算法寻优PID控制参数，采用变交叉概率和变异概率自适应遗传算法寻优得到PID控制参数，与传统的整定结果相比较，遗传算法优化效果更好，最终达到最优的控制效果．     

互联电力系统AGC的模糊和遗传控制算法

针对互联电力系统自动发电控制(AGC),结合模糊控制和遗传算法提出一种新型的PID智能控制器.这种控制器主要特点是选用遗传算法整定的PID参数值作为模糊自整定PID参数控制器的初值,然后再对模糊控制的相关参数用遗传算法优化,避免了参数选择的盲目性.仿真结果明显优于传统的PID控制器,同样也优于单独模糊PID控制器和由遗传算法寻优而设计的PID控制器.同时,在研究遗传算法寻优的过程中提出一种新的适应度选择方法.     

一种基于遗传算法的单神经元PID控制器参数优化

文章分析了神经元PID控制器存在的问题,提出了一种用遗传算法对单神经元控制器进行参数寻优,并利用种群数N和交换概率Pc逐次递减的方法来提高计算效率和收敛速度,在搜索空间内获得全局最优点的方法。试验仿真结果表明,基于遗传算法的单神经元PID控制器参数优化方法能获得很好的控制效果。     

新型船舶自适应舵机系统的研究

提出了采用模糊辩识器对船舶舵机离线辩识,使用遗传算法对辩识器进行参数寻优,并用ＢＢＰ算法对模糊神经网络控制器的有关权值在线调整以适应被控对象的参数变化。给出了遗传算法对控制器的参数优化方法。仿真结果证明了控制策略的有效性。     

遗传算法在PID控制器参数寻优中的应用

针对遗传算法易早熟收敛,对参数有较强的依赖性,而模拟退火法的搜索过程冗长的缺点,采用混合策略,在优化机制、结构和行为上结合两者的特点,提高算法的优化能力、效率和可靠性.在PID参数寻优中采用混合策略,将SA状态产生函数作为变异概率可控的变异操作,在高温下有较强的变异功能,在低温下有较强的趋化功能.仿真结果说明,混合策略在PID参数寻优问题中明显优于单一遗传算法和传统整定方法.进一步分析了PID参数寻优是一个多目标的优化问题,探讨了可行方向.     

基于遗传算法的模糊控制器设计

遗传算法是建立在自然选择和自然遗传学机理上的遗传自适应概率性探索算法，对于多变量寻优问题是一种易于实现的、有效的途径，提出了一种基于遗传算法的隶属函数和控制规则的最优设计方法。仿真结果表明，用该方法设计的模糊控制器用较少的模糊变量即可获得良好的性能。     

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…     

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。     

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     

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     

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

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An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

Integrating GIS Web services based on mediating architecture

The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.     

Tracking data management using topology of moving object database system for moving object constrained trajectory in LBS application

Advances in wireless technologies and positioning technologies and spread of wireless devices, an interest in LBS (Location Based Service) is arising. To provide location based service, tracking data should have been stored in moving object database management system (called MODBMS) with proper policies and managed efficiently. So the methods which acquire the location information at regular time intervals then, store and manage have been studied. In this paper, we suggest tracking data management techniques using topology that is corresponding to the moving path of moving object. In our techniques, we update the MODBMS when moving object arrived at a street intersection or a curved road which is represented as the node in topology and predict the location at past and future with attribute of topology and linear function. In this technique, location data that are corresponding to the node in topology are stored, thus reduce the number of update and amount of data. Also in case predicting the location,because topology are used as well as existing location information, accuracy for prediction is increased than applying linear function or spline function.