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1.
以我国东南沿海甬江流域为例 ,探讨了将地理信息系统应用于中小流域洪水预警和防洪减灾系统的途径和方法 .研究设计了中小流域防洪决策支持系统的结构 ,初步实现了流域水情自动监测、洪水预警、灾情评估和洪水调度等多种功能 .该系统有力的提高了中小流域防洪决策水平 ,并为中小流域防洪减灾决策支持系统的建立提供了经验和模式 .  相似文献   

2.
基于数据仓库的融合式DSS结构的研究   总被引:2,自引:0,他引:2  
分析了决策支持系统(DSS)的结构特点,针对传统DSS的不足,研究了 数据仓库的结构特征,进而提出了一种基于数据仓库的融合式决策支持系统(HDSS)的结构,并从系统管理和系统功能两个角度对HDSS的结构作了详细介绍。  相似文献   

3.
通过对银行决策支持系统的功能需求进行分析。给出了基于数据仓库技术的银行决策支持系统结构设计与实现过程,并对设计过程中涉及的决策支持系统的体系结构、技术特点进行深人的研究,提出一些新的实现方法。  相似文献   

4.
以PowerBuilder为开发工具,规划出了水电站防洪决策支持系统的数据库结构,并成功地开发了系统的数据库管理子系统。研究成果已在电站应用,取得满意效果。  相似文献   

5.
以我国东南沿海甬江流域为例,探讨了将地理信息系统应用于中小流域洪水预警和防洪减灾系统的途径和方法。研究设计了中小流域防洪决策支持系统的结构,初步实现了流域水情自动监测、洪水预警、灾情评估和洪水调度等多种功能,该系统有力的提高了中小流域防洪决策水平,并为中小流域防洪减灾决策支持系统的建立提供了经验和模式。  相似文献   

6.
药品采购决策支持系统数据仓库模型的研究   总被引:1,自引:0,他引:1  
通过对决策支持系统和数据仓库的研究,提出了基于数据仓库的药品采购决策支持系统,并针对医院药品领域数据的自身特点设计了相应的数据仓库的模型。主要研究了数据仓库中的数据组织和设计数据仓库模型的关键技术,并简要给出了相应的设计方案。  相似文献   

7.
讨论了数据仓库的特点及其基本结构,在分析数据仓库与决策支持系统关系的基础上,提出和研究了基于数据仓库的决策支持系统的体系结构。  相似文献   

8.
基于数据仓库的决策支持系统的体系结构   总被引:3,自引:0,他引:3  
传统决策支持系统由于其功能的不足,不能满足现代企业的决策需求,而数据仓库技术是解决该问题的有效途径之一.文章分析了数据仓库技术在决策支持系统中的应用现状,提出了一种基于数据仓库的决策支持系统的体系结构,详细讨论了该体系结构中的数据仓库系统的结构,并简要介绍了相关的联机分析处理与数据挖掘技术.  相似文献   

9.
通过对数据仓库技术及决策支持系统的研究,提出了基于数据仓库的医疗决策支持系统。针对医疗领域数据比较复杂的特点,设计了相应的数据仓库.在项目应用中取得了良好的效果。介绍了数据仓库的设计过程、关键技术,并提供了简要的解决方案。  相似文献   

10.
刘杰  王永利 《应用科技》2003,30(4):25-28
数据仓库和数据挖掘是近几年迅速发展起来的技术,主要用于构建企业的决策支持系统.根据数据仓库和数据挖掘技术的特点,针对传统ERP系统在决策方面的不足,提出把数据仓库和数据挖掘应用到ERP中,以数据仓库作为企业底层的数据源,使用各种数据挖掘技术,以提高ERP中的决策支持功能.①  相似文献   

11.
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.  相似文献   

12.
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.  相似文献   

13.
王慧 《科技信息》2008,(10):240-240
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.  相似文献   

14.
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.  相似文献   

15.
何延凌 《科技信息》2008,(4):258-258
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.  相似文献   

16.
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.  相似文献   

17.
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.  相似文献   

18.
AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…  相似文献   

19.
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。  相似文献   

20.
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.  相似文献   

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