CORBA COM及其互操作技术

CORBA(通用对象请求代理体系结构 )和 COM(组件对象模型 )是分布计算的 2个重要规范 ,因此详细讨论了 CORBA和 COM的体系结构 ,还介绍了它们互操作的实现。重点介绍了 CORBA和 OMA(对象管理体系结构 )模型、ORB的系统组成、ORB的运行过程和 COM的客户 /服务器体系结构以及 COR-BA/ COM互操作的模型和实现方法     

网络虚拟电子实验室的构建与设计

文章主要介绍网络虚拟电子实验室的开发过程。在分析网络虚拟实验系统几种常见构建技术的基础上,提出了该系统构建的三层体系结构,利用HTMLJ、AVA VC＋＋、VRML技术构建表现层,基于JAVA SOCKET构建通讯层和基于ADO实现控制层,即多种技术融合观点,明确了网络虚拟电子实验系统的开发技术;对网络虚拟电子实验系统进行了设计,并给出三层体系结构模型图,确定了系统总体目标、设计原则、功能模块以及体系结构;通过具体实例给出了三层体系结构设计模型的开发,实现了系统的功能。     

集成UML和CORBA构建分布式供应链管理系统

供应链系统的动态性、分布性和复杂性要求开发出有效的分布式供应链管理系统。简要介绍了 UML面向对象建模技术和通用对象请求代理体系结构 ( CORBA)技术 ,提出了一种基于UML和 CORBA技术的分布式供应链管理系统的集成开发方法 ,描述了运用 UML对供应链建模的 3个基本步骤 ,以及 UML到 IDL的映射。最后 ,以库存系统的开发为例 ,展示了这种集成开发方法。     

并行CORBA在网络并行计算中的应用研究

讨论了一个通用对象请求代理体系结构 ( CORBA)的扩展 -并行 CORBA,并详细分析了它的原理 .以油气储层随机建模计算模型为例 ,研究了基于并行 CORBA的油气储层随机建模计算模型 ,实现了基于并行 CORBA技术油气储层随机建模的软件 .结果表明 ,并行 CORBA技术大大提高了油气储层随机建模的计算效率 ,有效地利用了网络资源     

并行CORBA在网络并行计算中的应用研究

讨论了一个通用对象请求代理体系结构(CORBA)的扩展一并行CORBA，井详细分析了它的原理．以油气储层随机建模计算模型为例，研究了基于并行CORBA的油气储层随机建模计算模型，实现了基于并行CORBA技术油气储层随机建模的软件．结果表明，并行CORBA技术大大提高了油气储层随机建模的计算效率，有效地利用了网络资源．     

三层体系结构模式资料管理系统应用及讨论

讨论三层体系结构实现的技术和方法 ,利用三层体系结构技术和PoweDynamo的新特性 ,开发基于三层结构模式的结算系统资料管理系统 ,实现对结算系统的维护和管理 ,给出了所涉及的关键技术及编程技巧     

集成CORBA和UML的分布式应用开发

简要介绍了采用通用对象请求代理体系结构（CORBA）技术的分布式应用系统开发过程和基于UML的面向对象建模技术,提出了一种以基于UML的面向对象建模技术和CORBA技术为基础的分布式应用的集成开发方法,可以将系统分析、设计和实现三阶段有机、无缝地集成,以方便迅速地开发出开放、可重用和可扩展的分布对象系统,并指出了该开发方法中的2个关键问题：UML到OMG IDL的映射,以及对象在系统中的分布。最后,以虚拟银行系统的开发为例,展示了这种集成开发方法,验证其可行性和优点,并指出其局限性。     

CORBA COM及其互操作技术

CORBA（通用对象请求代理体系结构）和 COM（组件对象模型）是分布计算的2个重要规范(因此 详细讨论了CORBA和 COM的体系结构(还介绍了它们互操作的实现6重点介绍了CORBA/COM对 象管理体系结构.模型ORB的系统组成ORB的运行过程和 COM的客户/服务器体系结构以及CORBA/COM互操作的模型和实现方法     

基于中间件技术的计算机考试系统

介绍了中间件技术的基本概念及主要功能,阐述了基于两层客户机/服务器(Client/Server)结构计算机考试系统的不足和引入中间件后的三层客户机/服务器体系结构的优势,实现了中间件技术在计算机考试系统中的应用.     

高校教学综合管理系统的设计与开发

本文介绍了基于网络的教学综合管理系统结构、功能以及设计方法,并重点阐述了三层体系结构和系统安全技术在系统设计中的应用。     

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…     

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.     

Tracking data management using topology of moving object database system for moving object constrained trajectory in LBS application

Advances in wireless technologies and positioning technologies and spread of wireless devices, an interest in LBS (Location Based Service) is arising. To provide location based service, tracking data should have been stored in moving object database management system (called MODBMS) with proper policies and managed efficiently. So the methods which acquire the location information at regular time intervals then, store and manage have been studied. In this paper, we suggest tracking data management techniques using topology that is corresponding to the moving path of moving object. In our techniques, we update the MODBMS when moving object arrived at a street intersection or a curved road which is represented as the node in topology and predict the location at past and future with attribute of topology and linear function. In this technique, location data that are corresponding to the node in topology are stored, thus reduce the number of update and amount of data. Also in case predicting the location,because topology are used as well as existing location information, accuracy for prediction is increased than applying linear function or spline function.