山西省气象科学数据共享服务平台建设

阐述了山西省气象科学数据共享系统的结构框架、数据集的制作、数据库的建设及网站建设等内容。     

民航气象数据库管理监控系统的设计与实现

在分析和总结系统业务流程的基础上对气象数据库管理及监控系统的建设方案进行研究,提出了采用分区数据存储、分批数据清除、数据泵等技术对气象数据进行存储管理,建立了基于性能基线的数据分析方法和RMI通信技术的远程气象数据库管理监控系统.系统在民航气象领域的成功应用,表明该方案提高了系统的实时性和稳定性.     

基于SOA的地理信息系统空间数据库设计

随着Google Earth等应用的普及和地理数据采集成本的下降,依托于地理信息的各种系统建设及应用也日益普及。系统服务的好坏很大部分取决于数据,同样地理信息系统数据库设计对地理信息系统服务应用的质量也至关重要。由于传统生产观念的影响,服务型地理信息系统建设在数据库设计方面总是过多考虑数据如何方便更新,而往往忽略数据如何更好应对服务的设计本质。为了保障地理信息系统服务的高质量,文章在充分介绍了空间对象和空间数据库的特点和相关技术后,详细讨论了空间数据库设计的关键技术,指出了服务导向原则对该设计的重要作用,并从作者自身系统研发经验出发,阐述了面向服务的数据库建设的概念、内涵及设计要求。     

一种面向社保领域的数据清洗整合系统架构

昆明市社会保险管理系统包括医疗、养老、失业、工伤和生育五大业务子系统，由于信息化建设进程的前后不一致导致五大业务子系统之间数据的不一致，因此对五险数据进行清洗与整合、建立五险公共数据库势在必行。针对社保领域的数据质量问题，本文设计了数据清洗整合系统架构，该系统架构分为五个层次，分别是公共交易数据库层,同步数据层,数据清洗与整合层，公共数据库层，报表展现层。     

数字旅游建设体系结构设计

数字旅游系统的总体框架和体系结构,是系统研究工作的核心和建设的依据.数字旅游的建设内容包括旅游信息基础设施的建设与旅游应用信息系统的建设;数字旅游的体系结构主要包括系统的逻辑设计、数据库设计以及功能设计.逻辑设计包括系统的硬件、软件和网络配置等组成部分.数据库是数字旅游系统的核心组成部分,是数字旅游应用系统运行的基础,数据库的合理设计有助于应用系统的高性能实现.数字旅游系统功能的设计是具有针对性的,主要包括数据管理、显示、查询、分析与评价功能、旅游信息网络发布功能、远程数据上报功能和三维景观系统功能等基本功能.     

数据瘦身系统建设方案探讨

数据瘦身系统建设的目标是为了解决电信运营商日益增长的历史数据造成系统性能下降,占用昂贵的存储空间资源的问题,并且为历史数据的统一存储和管控提供了有效的解决方案。通过瘦身系统抽取支撑系统数据库的数据并转存到非关系型数据库(HBase)中,用户可以通过瘦身系统提供的接口访问里面的历史数据,实现生产数据库数据清理和加速历史数据库的数据访问速度的目的。数据瘦身系统同时提供对历史数据的快速访问,通过对数据的存储优化和索引优化,对历史数据的访问将比未部署数据瘦身系统前得到较大的提升,改善用户的满意度。     

科技查新的数字化管理和数据共享

科技查新事实型数据库项目的事实型数据库建设,加速了各科技查新机构在查新业务和管理方面数字化建设的流程,科技查新综合业务管理系统使用为用户提供了数字化的科技查新业务流程管理,体现了先进的管理思想,极大地提高了查新工作效率,在很大程度上降低了管理成本。系统集成了历史查新报告的数据挖掘整理功能,使历史查新报告可以进行数字化存档管理;同时也为科技查新事实型数据库提供了数据导出接口,为科技查新事实型数据库建设提供了有力的数据支撑和保障。。     

工营事团燃气用户综合管理系统建设

从工营事团燃气用户综合管理系统的总体设计、功能、运行环境以及数据库建设等方面,阐述了工营事团燃气用户综合管理系统在燃气公司中的实际应用和重要作用,指出建设一个以用户基本信息数据、抄表收费数据和维修数据为基础的管理系统是当前燃气公司工作的迫切需求。     

基于西安市地震应急指挥技术系统的应急数据库的创建与实现

本文从数据分类、数据编码,数据处理与入库四个方面简要介绍了西安市地震应急指挥技术系统的应急数据库的创建与实现。本应志数据库的创建是首次将数字城市地理空间框架建设成果应用于地震行业的一次突破性创新,也是地震行业数据库建设模式的新的尝试,可为将来地震应急数据库建设发展与扩展模式提供可借鉴的经验。     

浅谈科技创新作品数据库建设

具体描述了科技创新作品数据库的建设,分析了数据库建设框架结构、数据的收录范围及数据的著录要求。     

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.     

Perspherical Approaches for Electrons in Atoms and Charged Excitons in Quantum Wells

Instead of following Fock’s expansion,we solve the Schrodinger equation for some quantum mechanical manybody systems such as electrons in atoms and charged excitons in quantum wells in a similar way in hyperspherical coordinates by expanding the wave functions into orthonormal complete basis sets of the hyperspherical hannonics(HHs)of hyperangles and generalized Laguerre polynomials(GLPs)of the hyperradius.This leads the equation to     

Advances in broadband wireless communications under high-mobility scenarios

Future mobile communication systems aim at providing very high data transmission rates, even in high-mobility scenarios such as high-speed wheel-track trains, maglev trains, highway vehicles, airplanes, guided missiles or spacecraft. A particularly important commercial application is the strong and increasing worldwide demand for high- speed broadband wireless communications （up to 574.8 km/ h test speeds or 380 km/h commercial speeds） in railways, providing data, voice and video services for applications such as onboard entertainment services to passengers, train control, train dispatch, train sensor status handling and sur- veillance. In such high-mobility scenarios, there are a number of communication challenges, including fast hand- over, location updating, high-speed channel modeling, estimation and equalization, anti-Doppler spreading tech- niques, fast power control, and dedicated network architec- ture. Because signal transmission in very high-speed scenarios will inevitably experience serious deterioration, it is imperative to develop key broadband mobile communi- cation techniques for such high-speed vehicles.     

Wuhan University Journal of Natural Sciences TOTAL CONTENTS

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Scale-based spatial data model for GIS

Being the primary media of geographical information and the elementary objects manipulated, almost all of maps adopt the layer-based model to represent geographic information in the existent GIS. However, it is difficult to extend the map represented in layer-based model. Furthermore, in Web-Based GIS, It is slow to transmit the spatial data for map viewing. In this paper, for solving the questions above, we have proposed a new method for representing the spatial data. That is scale-based model. In this model we represent maps in three levels: scale-view, block, and spatial object, and organize the maps in a set of map layers, named Scale-View, which associates some given scales.Lastly, a prototype Web-Based GIS using the proposed spatial data representation is described briefly.     

英文诗歌中的喻类修辞

为了有助于提高英文爱好者的个人情操、文化素养和学习兴趣,以及专业人员对英语学习和研究进行多途径的探索,本文通过一些精选诗歌的引证和分析,着重论述了喻类修辞法在英文诗歌中的运用其及效果。     

Man Is Unable to Change the Miserable Life——Analysis of the Arrangement of Four Characters in The Glass Menagerie

Tennessee Williams is considered as one of the most important American playwrights since World War II.The Glass Menagerie is his first successful drama,which describes a tragic situation of family and means to say that Man is unable to change the miserable life,no matter whatever means he try,This essay focuses on the analysis of the arrangement of the four main characters:Laura.Amanda,Jim and Tom to reveal the theme.Laura is fragile.Amanda is brave.Jim is vital.Tom is sensible.And all of them develop and try the different means to struggle against life,but fail tragically.With the evidence,the paper comes to conclusion naturally that Man is unable to change the miserable life,and he dooms to fail.     

Characterization of root-nodulating bacteria on Retama raetam in arid Tunisian soils

The aim of this study is to investigate the diversity of Retama raetam root-nodule bacteria isolated from arid regions of Tunisia. Twelve isolates, chosen as representative for different 16S rRNA gene patterns, were characterized by 16S rRNA gene sequencing and phenotypic analysis. Isolates were assigned to Sinorhizobium, Rhizobium and Agrobacterium. Symbiotic properties of Sinorhizobium and Rhizobium isolates showed a large diversity in their capacity to infect their host plant and fix atmospheric nitrogen. Strain RK 22 identified as Rhizobium was the most effective isolate.     

An Affordable Accurate Evaluation of the Binding Conformations Predicted by Molecular Docking Studies in Bio-System

正Recently,docking has been widely used to predict the binding-modes of protein-inhibitors,when the crystal complexes structure was absent.Most docking algorithms are able to generate a large number of probable conformations,it,however,is difficult to effectively evaluate these docking poses and identify the most reasonable bindingmode.In the present study,on the basis of the crystallographic data of human 3-hydroxy-3-methylglutaryl coenzyme     

WIMAX与WI-FI技术分析及联合组网

介绍了WiMAX与Wi-Fi两种无线宽带接入技术,并对两者之间的关系及相互之间的影响做了对比及分析,并对WiMAX的关键技术进行了详细说明,最后对两者的联合组网方式做了简单的探讨。