基于DCOM的串口组件开发技术

DCOM技术是微软的分布式应用框架的重要基础之一,可以解决在工程应用过程中主机无法直接与串口设备连接的问题.在详细研究DCOM 技术特点基础上,开发了基于DCOM的串口组件,实现了对远程串口设备的访问.     

基于COM/DCOM的分布式计算研究与应用

分布式计算技术在软件开发中得到了广泛的应用,它使复杂的大型网络应用程序变得易于开发。基于组件对象模型COM(Component Object Model)和分布式组件对象模型DCOM(Distributed COM)的组件技术是微软的分布式对象技术。通过详细地分析基于OM/DCOM组件技术的分布式计算的基本原理,总结了开发COM/DCOM组件的基本方法和三层分布式应用程序的实现过程。最后,给出了一个用COM组件构造的三层分布式应用系统实例。     

分布式组件对象技术的研究与应用

介绍了分布式组成对象技术的主要特点，比较了DCOM和CORBA这2大类分布式应用系统结构的异同.通过一个网上购物电子商务应用系统实例，具体说明了基于COM／DCOM技术的开发过程．     

适用于网络化制造模式的数控系统的研究

在综合分析网络化制造模式对计算机数控系统功能需求的基础上，从框架体系结构和技术体系结构等不同的方面详细地研究了满足网络化制造要求的数控系统－－WEB＿CNC系统的体系结构，同时对建立这一体系结构所涉及的基于EWB的浏览器／服务器处理技术、DCOM／CORBA技术、ASP／ADO技术、XML技术等网络支撑技术进行了研究，在此基础上，研究了EWB＿CNC系统的实现方法、包括采用基于Browser/Server结构实现数控系统远程服务和信息共享功能，满足系统的非实时性要求；采用基于DCOM／CORBA分布组件技术实现数控系统的远程监控功能，满足系统的实时性要求，最后建立了满足网络化制造要求的WEB＿CNC系统的功能模型，为WEB＿CNC系统的实现奠定了基础。     

基于DCOM的电子商务的实现技术

在研究目前电子商务系统的主要实现技术及电子商务系统的结构与功能特点的基础上,分析了DCOM技术在电子商务系统开发中的应用优势,提出了几种基于DCOM的电子商务的实现策略并给出了一个基于DCOM的电子商务系统的实现实例,建立了该系统的具体实现模型并开发了相应的原型系统。     

分布式应用技术中的CORBA、JavaRMI和DCOM

简述了目前3种流行的分布式应用技术CORBA，JavaRMI和DCOM的基本架构，从技术特点，管理的方便性，安全控制和适宜的应用环境等方面分析了3种技术的应用特点。     

分布式对象技术的分析与研究

本文分析了分布式对象技术的重要概念、基本原理和关键技术,对CORBA、DCOM和J2EE三大主流的分布式对象和组件技术进行了深入剖析,分析比较了三者的体系结构、核心技术与实现机理,为建立一种开放的大型复杂的分布式应用开发提供了参考.     

基于WCF的计算机远程监控系统的设计与实现

WCF是Microsoft公司推出的新一代企业级分布式应用程序开发框架,开发人员利用该框架可以构建一个跨平台的安全、可靠和支持事务处理的企业级分布式应用解决方案。在全面阐述WCF技术要素、技术优势、运行机制的基础上,提出了一个基于WCF技术的远程监控系统的架构设计与实现方案。     

小议虚拟仪器远程测控技术

本文讨论了基于Datasocket技术、基于DCOM/ActiveX技术和基于远程面板的三种不同的远程测控方案的实现和工作原理,并在实时性、远程控制、开发难度和可靠性方面进行了比较。     

基于远程通讯的COM与DCOM分布式组件技术分析

根据COM与DCOM分布式组件的软件原理,讨论了远程通讯分布式计算过程中COM与DCOM组件技术的技术优势,对比分析了包含API接口规范制约应用程序交互、ActiveX封装掩盖底层结构、API接口函数庞杂导致组件应用困难等特性的WINDOWS API平面式交互结构,并以远程通讯中的客户端请求和服务器组件对象的交互为实例,分析了分布式计算过程中的COM与DCOM分布式组件设计实现过程。     

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.