多媒体OCPN同步模型的研究及改进

Petri网作为一种描述系统行为的形式化工具，尤其擅长描述多媒体的同步问题，由此出现了诸如OCPN等多媒体同步模型，然而，这些模型仅能描述多媒体之间的合成同步，对于解决分布式环境下的多媒体同步问题却显得不足。本文提出了一个分布式交互多媒体同步模型，该模型可以较好的解决分布式多媒体系统的交互与同步问题。     

分布式多媒体信息模型

建立适应多种信息类型和支持人机交互的信息模型是分布式多媒体系统面临的基本问题。信息模型应能以统一的方式描述分布式环境下处于存储、编辑、传输、演示等各个处理阶段中多媒体信息之间的空间组合和时间同步关系，以及各处理阶段信息的转换。为此提出了一个面向对象的信息模型，模型定义了层次结构的数据库结构以管理多媒体数据；提出了基于事件的同步机制，能有效地解决媒体对象同步和人机交互的配合问题。此模型已用于分布式多媒体著作工具的开发。     

一种基于Agent的数据同步方法

数据同步是维持异构数据库间数据一致性的一种手段．针对目前各类流行数据库的特点，提出了一种适合于企业级数据同步的Agent方法．该方法重点讨论了数据库日志采集技术、SQL语句还原与更新技术以度数据同步策略，给出了实现该方法的框架结构，并采用Agent技术封装，实现了一个数据同步系统的实例．     

基于.Net Web Services的中药材系统的设计与实现

在分析贵州省分散的中药材数据库现状的基础上,提出了一种利用W eb Services技术整合大量分布式资源的中药材系统。对设计中的关键技术———数据同步更新、SQL语句重组及数据整合进行了详细地说明,并总结本系统的特点及以后要进行的改进工作。     

面向电力系统的分布式实时数据库关键技术及应用

本文论述了面向电力（SCADA/EMS/DTS）一体化系统的分布式实时数据库的特点和内存体系结构,对其分布机制、系统特色等方面进行了探讨,并对系统中实现分布式部署的关键性技术——数据库自动复制、心跳同步报文广播、总裁选举协议予以详细的阐述。基于本文原理的实时数据库系统已经实现,并在多个实际工程中得到应用。     

基于Oracle复制和分区技术的分布式网通销售系统的研究与设计

四川网通数据库具有数据量庞大、分布式管理的特点。为了实现双层管理,构建分布式数据库系统具有重要意义。复制技术能解决数据之间数据同步问题,orac le分区表技术能够区分数据源,保证数据安全的同时,提高数据处理效率。本文基于orac le9 i的复制和分区管理技术对分布式销售系统数据库做了改造,并用实例论证了其效率和可性行。     

面向电力系统的分布式实时数据库设计

论述了面向电力(SCADA/EMS/DTS)一体化系统的分布式实时数据库的特点和内存体系结构,对其分布机制、系统特色等方面进行了探讨,并对系统中实现分布式部署的关键性技术--数据库自动复制、心跳同步报文广播、总裁选举协议予以详细的阐述.基于此原理的实时数据库系统已经实现,并在多个实际工程中得到应用.     

基于J2EE的协同设计系统的体系结构研究

为了实现分布式协同设计,在对现有的协同模式进行分析的基础上,提出了一种基于J2EE和工程数据库的计算机支持的协同工作(CSCW)系统的实现结构.把系统数据分为全局数据和局部数据,而全局数据又划分为管理数据与工程数据,其中工程数据库管理系统采用Servlet/JSP/Bean,系统由全局数据进行控制,验证了分布式异步协同模式.采用Applet遵循CORBA协议与I-DEAS的通讯,验证了分布式同步协同模式.     

分布式数据库的同步复制技术研究

分布式数据库是分布式技术与数据库技术的结合,同步复制技术可以实现分布式数据库系统中全局数据的完整性和一致性。     

基于哈希树的分布式目录同步方法

在云存储应用中,用户通常需要在多个终端上对其工作目录副本进行修改,如何在分布式目录副本之间进行高效的数据同步是一个重要问题。设计实现了一个面向私有云存储的分布式目录同步系统HTD2Sync。系统以文件哈希值为依据进行并发同步冲突检测,能够在文件同步过程中过滤大量伪冲突;针对目录副本同步中的2种冲突类型和6种冲突场景,给出了对应的冲突消解方法;引入有序哈希树对用户目录副本的内容和结构进行建模,给出了有序哈希树的创建和更新方法。提出了一种基于有序哈希树的分布式目录副本同步方法,对其流程和核心操作步骤进行了说明,给出了有序哈希树比对算法COMPARE_OHT。实验表明,HTD2Sync系统能够快速感知私有云存储终端的文件变化,在云端文件变化感知方面也具有较高的效率。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

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.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

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.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-