一种对等网络的通信分析与实时应用

讨论了Ｎｏｖｅｌｌ Ｄｏｓ７点对点对等网络的特点，对网络中点通信速率进行了估算，结果表明Ｎｏｖｅｌｌ Ｄｏｓ７特别适合中，小型实时局域网系统。介绍了该对等网络的一个实时应用－－县级中、小型电网调度自动化系统，该系统的设计和开发兼顾了低成本和满足用户基本需求这两个基本因素，使系统具有良好的性能价格比，具有工作可靠，配置灵活，使用方便等特点。     

一种对等网络的通信分析与实时应用

讨论了ＮｏｖｅｌＤｏｓ７点对点对等网络的特点，对网络中各站点通信速率进行了估算，结果表明Ｎｏｖ－ｅｌＤｏｓ７特别适合中、小型实时局域网系统．介绍了该对等网络的一个实时应用——县级中、小型电网调度自动化系统，该系统的设计和开发兼顾了低成本和满足用户基本需求这两个基本因素，使系统具有良好的性能价格比，具有工作可靠、配置灵活、使用方便等特点．     

智能+技术背景下基于聚类算法的自动化审计研究

审计工作涉及大量的物资采购、财务以及税务数据，在人工模式下存在效率低下、成本较高的缺点，可将算法引入其中，从而实现自动化审计。具体的实施方法为收集存储原始业务数据，开展数据抽取、清洗和转换，利用聚类算法构建审计模型，通过机器学习训练、改进模型，直至其达到成熟状态。研究过程中依托K-means算法实现聚类，建立审计指标，收集企业的实际数据，开展自动化处理。结果显示：该算法模型能够实现指标重要性排序，并输出量化的审计结果。     

基于校园网的视频点播系统的设计与实现

本系统充分利用校园网宽带优势,将多媒体资源利用在线点播的形式提供给校园网用户,方便了终端用户的使用;同时为了减轻网络管理员的管理负担,最大限度的自动化了多媒体资源的发布、管理、统计和审计。     

杨村煤矿物资管理信息系统研究

运用目前较为流行的ＦｏｘＰｒｏｆｏｒＷｉｎｄｏｗｓ开发的杨村煤矿物资管理信息系统，该系统可实现整个煤矿物资管理的自动化，使计划员、统计员及仓库管理员从繁琐的业务中解脱出来，把主要精力投入到管理上来。文中主要阐述系统总体设计及现场应用效果。     

高校内部审计的现状及对策

高校应健全内部审计监督制度，加强对内部基础工作规范的审计，增强审计风险意识、服务意识和创新意识，加快内部审计工作自动化、网络化的建设，积极改善并营造良好的内部审计工作环境，实现内部审计工作由传统监督审计向现代管理审计的转型。为促进学校完善管理，规避办学风险，降低办学成本，提高办学效益，实现办学目标，提供最优质的内部审计服务。     

信息化环境下内部审计如何开展风险评估与控制

21世纪是信息技术的。随着生产的自动化、贸易中的商务的普及、财务软件的广泛使用、以及支付手段的多样化，审计信息化将是21世纪必然趋势。本文深入分析目前我国内部审计风险的成因、评估及控制，并对内部审计风险提出了若干建议。     

Linux内核级审计系统的设计与实现

审计主要用于记录系统的活动，是定位系统事故原因的强有力的依据，是安全操作系统的重要组成部分。Linux原有应用级的审计机制存在安全方面的缺陷，为此给出了一种基于Linux的内核级审计系统的设计与实现。该审计系统中的审计数据均在内核中采集，数据内容及格式符合PoSIX．le标准，并研究了保护审计系统自身的安全性的问题。     

DBMS安全审计功能测试用例生成方法

数据库管理系统（DBMS）安全审计功能的符合性测试要求测评人员设计有效覆盖安全功能规范的测试用例。本文提出一种基于安全审计规范使用标记迁移系统（LTS）建立形式化模型的DBMS安全审计测试用例自动化生成方法。该方法根据数据库分级评估的安全目标建立审计功能组件的LTS模型,再依据LTS模型启发式路径搜索算法从模型的路径中...     

Visual Basic4.0版本中的通讯问题研究

Ｖｉｓｕａｌ Ｂａｓｉｃ是深受程序员欢迎的一种编程软件,作者在利用ＶＢ的通讯控件进行通信口管理时,发现有数据丢失现象。本文分析了造成数据丢失的原因,提出了解决问题的方法,并在变电站计算机综合自动化控制系统中得到了应用。     

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.     

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).     

Wuhan University Journal of Natural Sciences TOTAL CONTENTS

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