供应商选择层次分析法/随机数据包络分析法研究

供应商选择直接关系到供应链中核心企业的采购质量，影响到企业的市场竞争力，因此，研究供应商选择方法，具有重要的理论意义和实践意义。在研究供应商选择基本原则、分析供应商选择常用方法的同时。综合供应商选择的层次分析法(AHP)和数据包络法(DEA)，提出了供应商选择的AHP／随机DEA方法。通过引入随机变量，解决了数据包络分析中权重选择的不足之处，把选择供应商过程中的主观判断转变为可信度判断，提高供应商评价的可靠度。     

一种综合的供应商评价方法

针对供应链管理中供应商选择问题(VSP),尝试将综合AHP(层次分析法)、PCA(主成分分析)和DEA(数据包络法)3种方法应用在供应商评价中,避免传统的单个方法或2个方法的综合使用中各种方法本身的缺陷,尤其是解决由评价准则的相关性带来的重复评价和权值给定的客观性的问题.通过实例分析说明,与带偏好约束的AHP和DEA综合方法的评价结果进行了对比,AHP,PCA和DEA三者综合评价法能够有效降低评价的复杂程度,减少数据的冗余,可更加真实有效地反应供应商得分的实际情况,避免由于评价准则之间的相互关系所带来的重复评价问题.     

供应商选择的AHP/随机DEA方法

供应商选择直接关系到供应链中核心企业的采购质量,影响到企业的市场竞争力,因此,研究供应商选择方法,具有重要的理论意义和实践意义.文中研究了供应商选择基本原则,分析了供应商选择常用方法.综合供应商选择的层次分析法(AHP)和数据包络法(DEA),提出了供应商选择的AHP/随机DEA方法.通过引入随机变量,解决了数据包络分析中权重选择的不足之处,把选择供应商过程中的主观判断转变为可信度判断,提高供应商评价的可靠度.     

基于AHP/PROMETHEE/GAIA的供应商选择决策方法

供应商选择问题是企业界和理论界十分关注的决策问题．在分析已有的多准则决策方法局限性的基础上，提出了一种基于层次分析法、偏好顺序结构评估法与交互辅助几何分析法相结合的供应商选择方法．以质量、经济因素、技术水平、供应能力与响应能力因素作为候选供应商的评价准则，用层次分析法确定供应商选择问题的结构及其评价准则权重，用偏好顺序结构评估法对候选供应商进行最终的评价，用交互辅助几何分析法对其进行灵敏度分析，最后通过算例证明了该方法的有效性．     

敏捷供应链中供应商选择的AHP/DEA方法

针对敏捷供应链管理中供应商选择这一重要问题，考虑到网络技术和信息技术的发展所带来的企业可供选择的供应商越来越多以及处理选择供应商的数据越来越大的特点，迫切需要一个综合评价供应商的方法。分析了网络时代供应商选择的特点，结合层次分析法（AHP）和数据包络法（DEA）的优缺点，提出了一种选择供应商的AHP／DEA方法，并运用AHP／DEA方法对实例进行分析和计算，得到了满意的计算结果。     

以数据包络分析法进行判断矩阵排序的AHP方法及其算例

文章介绍了利用数据包络分析法(DEA)获取层次分析法(AHP)中判断矩阵权重排序的方法,探讨了它的可行性.通过算例显示出该模型适用性广泛.同时,当准则含有决策者偏好时,传统的特征向量方法无法进行调整而显得无能为力.而改进了的运用公共权重计算的DEA方法可以体现出这种差异,从而反映了这种方法的优越性.     

一种基于目标规划的AHP参数学习算法

为提高采用层次分析(AHP)算法辅助采购决策问题的准确性,针对用户的最终选择与模型推荐结果的不一致,该文采用目标规划方法对AHP模型参数权重进行学习。通过理论分析和实例说明了算法的可行性,并将算法初步应用于某摩托车电子商务平台供应商选择决策支持系统。这种基于目标规划的AHP参数学习算法可通过多次学习积累采购者的评价习惯,弥补行业性电子商务平台一般性决策支持工具的不足,也可以用于其它决策支持领域相近问题。     

数据包络分析法应用于判断矩阵排序的方法探究

文章介绍了利用数据包络分析法(DEA)获取层次分析法(AHP)中判断矩阵权重排序的方法,探讨了它的一致性、保序性等性质.例举的具体算例显示出该模型可广泛适用.同时,当准则含有决策者偏好时,传统的特征向量方法(EMV)无法进行调整而显得无能为力.而改进了的运用公共权重计算的DEA方法可以体现出这种差异,从而反映了这种方法的优越性.     

集成AHP/DEA模型及其应用

文章介绍了层次分析法(AHP)与数据包络分析(DEA)集成方法,并建立了多目标、多层次及多方案问题评价与决策模型,它以DEA为主体模型,以AHP为辅助模型,集两种方法的优点,可以客观地对多目标、多层次及多方案优选问题进行评价与决策.应用实例说明了模型与方法的有效性.     

公路网规划方案综合评价方法

公路网规划方案评价是多层次、多目标的评价体系 ,应当从技术、经济、社会以及环境多方面进行定性、定量的综合评价。文章提供一种综合评价方法 ,即以二级模糊综合评判为框架 ,采用层次分析法 ( AHP)确定方案影响因素及子因素的权重 ,结合模糊决策中的无条件模糊优越集合理论建立模型。用此模型对某市公路网规划方案进行综合评价分析 ,取得了较好的效果。     

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.     

A computer generator for randomly layered structures

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

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

Integrating GIS Web services based on mediating architecture

The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.