基于遗传算法的排课系统研究

排课问题是一个多约束、多目标的组合优化问题,本文基于本校教学管理过程的实际情况,利用遗传算法对排课问题建立数学模型,设计了适应度函数,通过选择、交叉和变异等过程,进化得到最优解。实验结果表明本算法能够有效的解决本校的教务智能排课问题。     

基于Pareto多目标遗传算法的排课算法

中小学课表编排要考虑时间、空间和人员安排问题等多个目标的同时优化问题。传统方法是将多目标优化问题的多个目标函数通过适当方法(如加权法等)转化为单目标优化问题进行处理。该方法的缺点需要对优化问题掌握一定的先验知识,否则难以确定加权系数。针对传统多目标算法需要对目标掌握先验知识的缺点,该文提出一种基于Pareto多目标遗传算法的排课算法,并实验证明该方法的有效性。     

基于遗传算法的时间表问题研究

时间表问题是一类特殊的调度问题,排课问题是它的一个实例。排课问题是一个多因素的优化决策问题,遗传算法被广泛应用于解决多目标优化问题。本文根据排课问题的特点,给出了排课问题的数学模型,提出了一种基于遗传算法的解决方法。     

基于遗传算法的高校排课数学模型

排课问题是一个有约束、多目标的组合优化问题,并且已经被证明是一个NP完全问题。针对高校排课过程中存在诸多约束因素的问题,提出将遗传算法与约束条件算法相结合的排课算法,由约束条件算法确定排课任务的优先次序,遗传算法解决单个排课任务时间片分配的优化问题。实验结果表明,该算法能够改进算法性能,提高排课效率。     

选课走班模式下选排课流程优化——以北京劳动保障职业学院贯通培养项目为例

该文通过对选排课流程中存在的问题进行分析,对选排课流程从学生需求重视程度与反馈效率两方面进行优化提升,并将优化后的方案应用于北京劳动保障职业学院贯通培养项目,有效地提高了选课满意率,增加了选课成功人数。该文提出的优化后选排课流程,对其他学校的选排课具有重要的指导意义。     

遗传算法在中小学排课系统中的应用

分析了中小学排课的数学模型,根据遗传算法本身特点设计了一种数据结构基因编码及几个涉及到的优化目标评价函数,提出了利用遗传算法解决排课问题的方法,并通过试验验证了该方法的有效性和可靠性.     

模拟退火算法在排课问题中的应用

针对课表问题的具体特点,使用以课程作为排课算法的研究主体的思路,设计了一个模拟退火算法,解决了给定时间问题和不定时间问题的课程表的优化编排问题,并对生成的课表提出更具体的优化目标,通过设计合适的优化函数来实现这些目标,取得了较好的运行效果.     

高职院校教学管理系统中的排课算法的实现

本文分析了高职院校的排课系统问题,给出了排课问题的数学模型,研究如何利用遗传算法,解决排课系统中的资源冲突,课表的多目标优化问题。实验证明,遗传算法能简化程序的复杂度和生成最佳课表的时间,其收敛速度和寻优能力,能在理想时间内找到最优解。     

排课算法问题求解探讨

排课问题是一个在组合基础上有限制且多目标的优化问题,并已被证明为一个和网络处理器有关的NP难问题。遗传算法是一种在生物界自然选择和进化机制基础之上发展而来的高度并行、self-adaptive的随机搜索算法,是近似求解网络处理器的难问题的一种有效方法。研究将遗传算法应用于解决排课问题。     

排课数学模型及其算法

针对院校排课问题,建立多目标优化的数学模型,并对这一模型提出一种随机旋转遗传算法,使模型的求解速度大大提高。为在不可遍历的可行域中,提供一种寻优的途径。     

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.