一种时序关联规则挖掘算法的研究与实现

针对时间序列,研究和分析时序关联规则挖掘,提出时序关联规则数据挖掘的基于滑动窗口和时序树特殊结构的新的挖掘算法,并利用该算法挖掘超过给定支持数阈值频繁时序,为用户的决策支持及趋势预测提供支持,并通过实验验证算法的有效性和实用性。     

基于改进FP-树的时序关联规则挖掘的研究

时序关联规则的研究具有重要的现实意义,因而根据传统的FP-树思想,提出了一种基于改进的FP-树的时序关联规则挖掘的方法．根据FP-树的思想,将时间序列中的频繁项映射到树中,以降低频繁时序模式的搜索空间,该算法在挖掘过程中不用生成大量的频繁模式候选集,提高了时序关联规则的挖掘效率．     

基于定量关联规则树的分类及回归预测算法

为了解决基于Apriori的分类关联规则算法挖掘数值型数据时效率和准确率偏低的问题,提出基于定量关联规则树的分类及回归预测算法。采用改进的定量关联规则算法挖掘数值型数据生成关联规则库,并基于关联规则树结构实现分类及回归预测。研究结果表明：改进的Apriori定量关联规则挖掘算法提高了分类预测的准确率并降低了计算复杂度;而采用关联规则树结构可使分类与回归预测时间明显加快,提高了样本匹配学习的速度。     

一种时序关联规则改进算法的研究

对海量的时间序列进行处理,挖掘其背后蕴涵的价值信息具有重要的意义。本文结合了时序逻辑和数据挖掘的知识对基于FP_树的时序关联规则展开了研究,并在传统的算法基础上提出了一种改进算法。该方法不用生成大量的频繁模式候选集,从而提高了时序关联规则的挖掘效率。     

基于时间段的时序规则发现

时序规则挖掘用以挖掘数据库中与时间相关的规则及模式.现今大部分时序数据挖掘均是针对基于时间点的,基于时间段的挖掘相对较少.在此提出一个新的基于时间段的时序规则挖掘算法,通过挖掘频繁闭模式集取代完整频繁模式集,减少了挖掘时间,算法效率很高.     

空间跨层关联规则挖掘算法的研究

在空间关联横向挖掘中,针对现有基于空间事务的挖掘算法不能快速地挖掘空间跨层关系,提出一种空间跨层关联规则挖掘算法,其适合在空间关联横向挖掘中提取空间跨层关联规则;该算法将空间事务的跨层关系转换为整数,采用自顶向下搜索策略,按非频繁项对应的属性位数递减的方式产生候选频繁项,有效地提高挖掘效率;在提取空间跨层关联规则时,实验证明它是快速的.     

基于模糊集的时序关联规则的度量准则

指出了时序关联规则在支持度度量上的不足,存在处理高密度海量数据时往往要耗费大量的时间处理规模巨大的频繁候选集,同时需要多次重复扫描数据库,执行效率低等问题,提出了重新定义支持度度量方法的时序关联规则.针对时序关联规则在解决项分类时涉及到的分层不确定、不准确情形,引入了基于隶属度的模糊层次分类结构,定义了项间距离、项集间距离,最终得到一种新的关联规则间距离的度量方法.实现了模糊层次分类,将时序关联规则结果进行聚类分析,得到规则和规则之间相似性,实验验证了该方法的有效性.     

基于关键属性约束的关联规则挖掘在日志分析中的应用

日志是计算机取证,入侵检测分析的重要数据来源,运用关联规则挖掘算法对日志进行分析是获取日志中所蕴含有用信息的重要方法.针对基于置信度一支持度框架的常用关联规则挖掘算法在日志分析中存在的不足,引入日志关键属性的概念,提出了基于关键属性约束的关联规则挖掘算法.实验结果表明,该算法能有效阻止无趣规则的产生,提高挖掘结果的有效性.     

基于对象立方体结构的高层关联规则挖掘方法研究

在属性的高层概念上发现的关联规则为高层关联规则,对基于对象立方体结构的高层关联规则挖掘方法进行了研究.提出了一种挖掘高层关联规则的算法,并用算法进行了实验,得到的关联规则可以为用户提供一些常识性的知识,对高层决策有较大的帮助.     

Fuzzy association rules mining from time series based on FCM clustering

针对复杂系统产生的时间序列,研究其局部关联特征比研究系统全局特征模型具有明显的优势.为研究时间序列内部或局部形态的关联特征,首先借助FCM来软化时间序列属性论域的划分边界,然后,采用改进的布尔型属性关联规则并行挖掘算法来发现频繁模糊属性集,最后由多个处理器并行地产生满足最小模糊信任度的模糊关联规则.提出了基于FCM聚类的时间序列模糊关联规则的并行挖掘算法,并通过实验验证了算法的有效性.     

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.     

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.