遗传算法在系统辨识中的应用

基于遗传算法,采用改进的遗传算子,提出了一种辨识系统参数的方法,该方法能有效地克服有色噪声的干扰,获得系统参数的无偏估计。仿真结果说明了该方法的有效性。     

遗传算法在系统辨识中的应用

基于遗传算法,采用改进的遗传算子,提出了一种辨识系统参数的方法．该方法能有效地克服有色噪声的干扰,获得系统参数的无偏估计．仿真结果说明了该方法的有效性．     

基于遗传势场法的足球机器人路径规划

以足球机器人系统为研究背景,采用了人工势场法和遗传算法相结合的方法,实现了足球机器人路径规划.首先根据势场原理设计可调参数的势场函数,再规划出已知环境下可调参数的势场函数,然后设计遗传算法中的相关适应值函数,最后用遗传算法优化势场函数中的参数,得到遗传势场法.同时利用C++编程实现遗传势场法的仿真平台,并在该平台上进行仿真实验,结果表明,遗传势场法具有避障以及适于在实时环境中使用的优点,在解决实际路径规划问题中是行之有效的.     

一种改进的分布式遗传算法在机器博弈中的应用研究

为提高机器博弈系统的智能水平,改善传统方法在静态评估参数组合优化训练中效率低下和训练结果质量不高的问题,提出一种分布式氏族遗传算子,从种群扩充方法和染色体复制的过程中实现了对自适应性遗传算法的改进.改进后的遗传算子在亲子代优良性状继承能力和基因表达的可解释性上有所提高,并在国际跳棋的优化实例中取得良好训练结果.通过仿真实验验证了所提出算法在处理一般性问题时性能稳定可靠.      

基于模糊控制的超精密隔振平台优化设计与仿真

为了提高超精密隔振平台隔振效果,对隔振系统进行模糊控制器设计和结构优化设计.在ADAMS/view环境下创建平台参数化模型,以隔振平台加速度、系统动挠度和底座动位移作为性能目标函数进行结构优化.对模糊控制下的主动隔振系统采用ADAMS与Matlab联合仿真的方法.仿真结果表明,经过ADAMS优化之后的主动隔振系统能有效提高主动隔振平台的隔振效果,联合仿真方法为隔振系统动力学仿真提供了一条新的思路.     

基于遗传算法的车间设备虚拟布局优化技术研究

根据车间布局设计的最小物流费用原则,建立车间设备布局优化模型,并对该优化模型进行遗传算法求解．借鉴车间设备布局的块树表示法,设计了基本块、分割线和方向的混和染色体,并给出解码方法．根据车间布局优化的特点,改进选择算子、交叉算子和变异算子等遗传操作算子,设计基于块树的分割线有效性检验算法,并融合了选择交叉算法的优点,有效地避免了遗传过程中无效个体的大量出现,保证了算法的有效性和高效性．最后,给出了一个12台设备车间布局仿真算例,结果表明,算法快速地在进行到170代左右时达到了收敛,并采用虚拟现实技术将计算结果形象地呈现出来．本文所提出的方法能够很好地解决车间设备虚拟布局问题．     

化工过程计算机集成运行系统的研究

针对国内外计算机集成过程运行系统(CIPOS)的研究应用现状,开发了面向对象的基于过程仿真的CIPOS平台,并在此平台上对一换热器网络进行案例研究,实现了该换热网络的优化控制.表明该平台可进行CIPOS决策应用的研究和开发,为将来在此平台上进一步开发研究奠定了基础.     

氨纶生产线模拟仿真系统

由于氨纶生产工艺复杂,生产周期长,原材料价格昂贵,不可能也不允许在生产线上进行操作优化或工艺参数的寻优试验。为此,建立了氨纶生产线模拟仿真系统,并在该模拟仿真系统上进行操作优化、工艺参数的寻优、原料配方、工艺调整等各种试验,取得成功后,在生产线上运行。该模拟仿真系统为企业的操作人员培训、生产设备故障的快速诊断提供了良好的操作平台。     

基于数字制造环境的可重构装配线仿真分析平台

以某汽车变速箱装配生产线制造系统为背景,应用多Agent制造及Holon制造模式改造传统装配生产线以提升其柔性与重构能力·针对基于agent与holon混合思想的可重构装配生产线的基础框架与实现等理论提供分析验证环境,提出应用数字制造技术构建面向可重构装配线的数字仿真验证平台·在分析面向重构装配线的仿真平台功能特征的基础上,构建了数字仿真验证平台的框架·研究了仿真平台开发中的系统集成、可视化仿真、可重构装配线性能分析等关键技术,最后给出了仿真平台的实例系统·     

生态遗传算法在模糊系统辨识中的应用

给出一类模糊系统的模糊神经网络模型 .提出一种实用的生态算子 ,构建的生态遗传新算法有效解决了基本遗传算法的“早熟”问题 .采用新算法实现模糊神经网络模型的辨识 ,提高了辨识精度 .实例仿真结果验证了新算法在模糊系统辨识中的有效性     

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.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

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。     

Quantitative trait loci （QTLs） for quality traits related to protein and starch in wheat

Quality traits in wheat （Triticum aestirum L.） were studied by quantitative trait locus （QTL） analysis in a recombinant inbred line （RIL） population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross （ChSh）. Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.     

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.