知识服务中的供需双边匹配模型

研究了基于多指标评价信息的知识供需双边匹配问题.通过评价信息的处理,给出了知识供需双方满意度的计算公式,在此基础上,以知识供需双方满意度和知识服务中介利益最大为目标,构建了多目标双边匹配优化模型;进一步地,运用基于隶属函数的加权和方法,将多目标优化模型转化为单目标优化模型,并通过求解优化模型得到双边匹配结果;最后,通过...     

基于主体满意一致性的双边匹配决策方法

针对匹配主体给出以序值为偏好序信息的双边匹配决策问题,根据满意度随序值递减的特征,将匹配主体的偏好序信息转化为满意度,再以匹配主体满意度和最大且匹配主体满意度差异最小为目标,建立匹配方案的优化模型,并用实例验证该匹配方法的可行性和有效性.     

家政服务人员与雇主的双边匹配模型

针对如何依据家政服务人员和雇主的供需信息实现最优的双边匹配,从而提高匹配的效率和降低匹配的成本问题,对家政服务人员与雇主双边匹配问题进行了研究.首先,对家政服务人员与雇主的双边匹配问题进行描述;然后,依据家政服务人员与雇主提供的供需信息,分别计算家政服务人员和雇主的满意度;在此基础上,构建以家政服务人员和雇主的满意度最大为目标的多目标优化模型;通过求解模型,获得最优匹配结果.最后,通过一个算例说明了所提出方法的可行性与有效性.     

一种基于期望满意度的群决策方法

群决策过程是群成员相互作用的动态过程 .在这个过程中 ,不同的群成员表现出不同的影响力和偏好模糊程度 .基于不精确偏好规划方法和行为决策理论的满意方法 ,通过将决策人相对重要性权重的估计与群成员影响力和偏好模糊程度联系起来 ,定了一种期望满意度函数 ,并提出了一种基于期望满意度函数的群决策方法 .最后 ,通过一个实例对方法进行了验证     

基于满意度的多准则决策模型及其在员工绩效评价中的应用

针对评价准则权重信息不完全的群体多准则决策问题,首先利用方案满意度模型,对备选方案集中的每一个方案建立以最大化该方案满意度为目标的线性规划模型,得到一组权重向量,然后利用群决策中的相关集结方法将这组权重向量进行集结,得到对每个方案都公平公正的一个权重向量,利用该权重向量和加权平均模型得到方案的综合评价值,从而对方案进行优劣排序.最后,通过员工绩效评价的例子对本文提出的方法进行了说明.     

基于偏好序考虑主体心理行为的双边匹配方法

针对心理行为在双边匹配过程中容易被忽略或不能准确表示其产生速率先快后平缓趋势问题,根据偏好序与期望值进行合理分段,分析产生高兴、遗憾两种心理行为的情况,并考虑主体是否给出期望值结合心理行为的增长(下降)速率随着实际偏好与期望偏好差距变大而趋于平缓的这一特点,利用对数感知函数衡量心理行为得到心理感知值。对心理感知值进行归一化处理得到心理满意度,在此基础上,创建双目标匹配模型并通过求解该模型获得匹配方案。最后,与已有方法进行对比实验,分析说明该方法在提高匹配双方总体满意度上的有效性。     

属性权重未知的不确定语言评价双边匹配决策

针对匹配主体没有提供属性权重信息的不确定多粒度语言评价双边匹配问题,提出了一种基于离差最大公式和二元语义的决策方法。决策中,首先创建一个基本语言评价集(BLTS),将多粒度的不确定语言评价信息转换为区间二元语义,并且将所有区间二元语义根据公式投影到基本语言评价集上。根据区间二元语义的距离公式,计算属性之间的离差。通过离差最大化公式,计算得到每个匹配主体的属性权重向量。进而通过属性权重对区间二元语义加权平均,根据理想逼近法计算最终的满意度,得到最终的求解模型。最后通过实验证明该决策方法的可行性。     

基于矩阵分解的不完全偏好值信息双边匹配决策

针对匹配主体没有提供全部偏好值信息的双边匹配问题,提出了一种基于偏差矩阵分解技术解决不完全偏好值信息双边匹配问题的决策方法。给出了基于部分偏好值信息的双边匹配问题的描述,利用偏差矩阵分解技术,充分挖掘用户的潜在偏好,填充缺失偏好值,将匹配双方的不完全偏好值矩阵转化为完全偏好值矩阵并进一步转化为满意度矩阵。建立匹配优化模型并通过模拟退火算法求解,实验结果表明,该决策方法可行。     

一种基于其望满意度的群决策方法

群决策过程是群成员相互作用的动态过程，在这个过程中，不同的群成员表现出不同的影响力和偏好模糊程度。基于不精确偏好方法和行为决策理论的满意方法，通过将决策人相对重要性权重的估计与群成员影响力和偏好模糊程度联系起来，定了一种期望满意度函数，并提出了一种基于期望满意度函数的群决策方法。最后，通过一个实例对方法进行了验证。     

具有独立偏好的三方匹配问题

【目的】讨论3个主体集U,V,W之间的三方匹配问题,得到相关理论与算法。【方法】通过三方匹配问题所导出的一对一双边匹配问题,应用双边匹配问题的结果得到所讨论的三方匹配问题的相关结果。【结果】对于具有独立偏好三方匹配问题,给出其稳定匹配概念,并证明稳定匹配一定存在,以及给出了求解稳定匹配的算法。【结论】所讨论的具有独立偏好三方匹配问题所得到的结果与算法为三方匹配问题研究与应用提供新途径。     

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.     

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…     

Perspherical Approaches for Electrons in Atoms and Charged Excitons in Quantum Wells

Instead of following Fock’s expansion,we solve the Schrodinger equation for some quantum mechanical manybody systems such as electrons in atoms and charged excitons in quantum wells in a similar way in hyperspherical coordinates by expanding the wave functions into orthonormal complete basis sets of the hyperspherical hannonics(HHs)of hyperangles and generalized Laguerre polynomials(GLPs)of the hyperradius.This leads the equation to     

Advances in broadband wireless communications under high-mobility scenarios

Future mobile communication systems aim at providing very high data transmission rates, even in high-mobility scenarios such as high-speed wheel-track trains, maglev trains, highway vehicles, airplanes, guided missiles or spacecraft. A particularly important commercial application is the strong and increasing worldwide demand for high- speed broadband wireless communications （up to 574.8 km/ h test speeds or 380 km/h commercial speeds） in railways, providing data, voice and video services for applications such as onboard entertainment services to passengers, train control, train dispatch, train sensor status handling and sur- veillance. In such high-mobility scenarios, there are a number of communication challenges, including fast hand- over, location updating, high-speed channel modeling, estimation and equalization, anti-Doppler spreading tech- niques, fast power control, and dedicated network architec- ture. Because signal transmission in very high-speed scenarios will inevitably experience serious deterioration, it is imperative to develop key broadband mobile communi- cation techniques for such high-speed vehicles.     

Wuhan University Journal of Natural Sciences TOTAL CONTENTS

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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。     

Scale-based spatial data model for GIS

Being the primary media of geographical information and the elementary objects manipulated, almost all of maps adopt the layer-based model to represent geographic information in the existent GIS. However, it is difficult to extend the map represented in layer-based model. Furthermore, in Web-Based GIS, It is slow to transmit the spatial data for map viewing. In this paper, for solving the questions above, we have proposed a new method for representing the spatial data. That is scale-based model. In this model we represent maps in three levels: scale-view, block, and spatial object, and organize the maps in a set of map layers, named Scale-View, which associates some given scales.Lastly, a prototype Web-Based GIS using the proposed spatial data representation is described briefly.     

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