基于遗传算法优化的自适应FNN-PID控制器研究

针对传统PID控制器参数整定后因无法在线自动调整而导致控制效果不理想的问题,提出了一种基于遗传算法优化模糊神经网络（FNN, Fuzzy Neural Network）的自适应FNN-PID控制器模型。该模型结合了模糊神经网络良好的自适应自学习能力和遗传算法强大的全局搜索能力,利用遗传算法对模糊神经网络的参数进行优化与训练,使PID控制器能够根据被控对象的变化而适时在线调整自身参数KP, KI和KD,从而达到理想的控制性能。将该控制器应用于异步电动机控制系统进行仿真实验,结果表明：基于遗传算法优化的自适应FNN-PID控制器具有较好的自适应能力和鲁棒性,控制效果明显优于传统PID控制器。     

改进的免疫遗传算法在优化问题中的应用

基于生物免疫系统原理,对人工免疫系统进行研究,提出了改进的免疫遗传算法.该算法的选择算子采用基于浓度和适应度的自适应式选择策略;引入免疫算子,抑制其优化过程中出现的退化现象.将改进的免疫遗传算法应用于TSP组合优化问题,仿真结果表明了该算法的有效性.     

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。     

基于模糊遗传算法的电液位置伺服系统控制

电液位置伺服板簧实验系统是一个典型的非线性系统，采用传统的PID控制策略难以获得较好的控制效果。基于遗传算法的模糊遗传算法，利用遗传算法强大的空间搜索能力，对模糊隶属函数进行优化。仿真结果表明：该算法在电液位置伺服系统控制中取得了响应速度快、稳定性优越的效果。     

一种求解TSP问题的改进人工免疫算法

TSP(旅行商)问题作为经典的组合优化问题,已经被证明是一个NP难题。文中提出一种基于改进的人工免疫算法的TSP求解方法。算法模拟了抗体的蛋白质多肽链结构、免疫系统的克隆选择机制以及浓度调节机制,使用了一种新的抗体间的相似性判断方法。另外,在算法的变异算子中还融合了贪婪算法。这些改进使得算法的搜索性能得到提高。实验结果表明与标准遗传算法相比,该算法全局搜索能力强、收敛速度快。     

遗传算法参数自适应控制的新方法

根据遗传算法参数自适应控制方法的不同分类,采用基于启发式规则的参数控制方法对遗传算法的种群数进行了宏观调控和微观调控。并采用不同特点的模糊控制器分别控制交叉率和变异率,使种群数、交叉率和变异率都能够随进化的实际情况发生自动调整,形成了一种新的种群数变化的模糊自适应遗传算法。实验数据表明这种算法能够有效防止遗传算法早收敛,同时也说明对参数进行自适应控制能够使遗传算法性能大大提高。     

基于遗传算法优化的模糊PID控制研究及其仿真

提出了一种基于遗传算法优化的模糊PID控制系统：采用遗传算法优化模糊控制中的隶属函数和控制规则,进一步完善了模糊PID控制器的性能,提高了系统的控制精度。并对优化后的模糊控制器进行了Matlab仿真研究,结果表明：经过优化后的控制器明显地改善了控制系统的动态性能,能使系统达到满意的控制效果,对进一步应用研究具有较大的参考价值。     

遗传算法优化的无刷直流电机模糊PID控制器设计

设计一种基于遗传算法优化的模糊PID(比例-积分-微分)控制器GFPC（genetic algorithm based fuzzy PID controller）, 以提高无刷直流电机的工作稳定性. GFPC通过模糊控制器整定PID的比例、积分和微分系数, 并采用改进的遗传算法对模糊控制器的隶属度函数和模糊规则进行优化, 以改善无刷直流电机的控制效果. 通过对比实验对该方法进行测试, 结果表明, GFPC具有更好的稳态性能和动态品质, 且自适应能力与鲁棒性更强.     

遗传算法优化的无刷直流电机模糊PID控制器设计

设计一种基于遗传算法优化的模糊PID(比例-积分-微分)控制器GFPC（genetic algorithm based fuzzy PID controller）, 以提高无刷直流电机的工作稳定性. GFPC通过模糊控制器整定PID的比例、积分和微分系数, 并采用改进的遗传算法对模糊控制器的隶属度函数和模糊规则进行优化, 以改善无刷直流电机的控制效果. 通过对比实验对该方法进行测试, 结果表明, GFPC具有更好的稳态性能和动态品质, 且自适应能力与鲁棒性更强.     

基于特殊二进制编码的自学习模糊遗传算法

为了提高自适应遗传算法(AGA:Adaptive Genetic Algorithm)的鲁棒性,并使之更有效地求解属于NP难类型的组合优化问题,提出了一种自学习模糊自适应遗传算法.该混合算法利用一个特殊二进编码标准GA在线学习AGA运行特性;通过强化学习方式自动设计和调整模糊知识系统,基于GA的自学习模糊技术可以获取AGA所需的优化模糊系统.仿真试验演示了采用所提出自动化方式设计的动态参数AGA系统及其自学习结果.试验结果表明,该算法可以用于解决类似于旅行商问题的组合优化问题.     

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.     

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.     

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.