基于案例推理的钻井复杂情况专家系统

传统的钻井专家系统采用基于规则的推理,对于难以规则化的典型案例不能够充分利用。为此设计开发了基于案例推理的钻井复杂情况专家系统(DTES),目的在于利用专家会诊得到的许多具体案例经验,对钻井过程中经常发生的各种各样的复杂问题进行及时、准确的识别和处理,从而提高钻井工作效率。示例结果表明该专家系统简便实用,能很好地提供现场支持。     

基于案例的推理及其在专家系统中的应用

基于案例的推理是继基于规则推理的又一专家系统设计技术。结合房地产估价专家系统，着重论述了基于案例推理的基本原理及实现过程。     

基于网络的案例推理专家系统

基于案例推理与网络的结合是案例推理技术发展的一个重要方向.根据网络的特点,提出采用面向服务的体系结构实现网络上的CBR专家系统,并基于J2EE平台实现了此CBR专家系统,以适应网络环境下知识工程的发展.     

基于范例推理的结核病专家系统

本文概述了什么是基于范例的推理，结核病数据库的建立，基于范例的推理在结核病专家系统中的应用，推理树与基于范例的推理的结合，其于范例推理的结核病专家系统的工作原理，模糊匹配与近似检索技术，以及基于范例推理的专家系统的应用前景。     

基于范例推理的结核病专家系统

本文概述了什么是基于范例的推理，结核病数据库的建立，基于范例的推理在结核病专家系统中的应用，推理树与基于范例的推理的结合，基于范例推理的结核病专家系统的工作原理，模糊匹配与近似检索技术，以及基于范例推理的专家系统的应用前景     

中医诊断专家系统中融合案例与模糊规则的推理机制研究

阐述了基于案例的推理和基于规则的推理的基本概念和原理,结合中医领域知识的特点,对传统的规则通过引入模糊逻辑,提出一种模糊规则推理机制进行知识的表示、获取和推理,并提出一种融合案例与模糊规则的推理机制,用于解决中医诊断专家系统的实际问题.     

案例推理和规则推理相结合的农业专家系统的研制

简要介绍了基于规则推理建立传统专家系统中遇到的一些问题，同时对基于案例推理的方法进行简单描述，提出了将两者相结合的农业专家系统，设计了该专家系统的整体结构图和工作流程，并对实现系统的部分关键技术进行探讨和构想；最后以马铃薯病害决策为例介绍了系统的工作步骤，验证了以此提高求解问题的可靠性，增强了系统在实际应用中的适用性。     

远程故障诊断中融合推理及信息反馈的研究

基于案例推理(CBR)与基于规则推理(RBR)的专家系统优势互补,并在机械故障诊断领域中有了一定的应用,但仍然受到知识库"瓶颈"的约束.文章提出了将CBR与RBR相结合的专家系统引入远程故障诊断中,使得系统的学习能力增强,知识库扩展速度提高;并引入信息反馈,提高了案例标本的准确性,更大程度地提高了故障诊断的效率及准确率...     

城市公共交通智能调度专家系统的研究

根据城市公共交通调度、专家系统知识及模糊控制理论建立了公交智能调度专家系统。该系统采用案例与规则两级推理机制,通过产生式规则实现对知识的表达,应用关系型数据库实现对知识的管理与操作。案例推理中设计了代码与属性两层匹配的推理策略,针对实际调度中的不精确判断,根据模糊控制与模糊推理的思想设计了模糊规则与模糊推理策略实现了基于规则的推理。该系统对实现公交系统智能化、提高公交调度的质量和效率具有重要的意义。     

学生网上选课专家系统

本系统基于网络的计算机系学生选课专家系统是为了适应导师制的需求而建立的。本系统在学生进行课程选修时，向学生提出专家性的建议和指导，帮助学生完成选修课程的工作；另外，还可以协助老师发布选修课程的有关信息。系统采用三级体系结构。专家系统的构建以产生式系统为基础并结合基于案例的推理。     

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.     

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.     

A computer generator for randomly layered structures

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

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.