J2EE架构下网络选课系统的设计和实现

J2EE是一种利用Java2平台来简化多级企业解决方案的开发、部署和管理的体系结构，使得部署在J2EE平台上的多层应用能够实现高可用性、安全性、可扩展性和可靠性．对实际应用的J2EE分层结构进行了详细分析，给出一种J2EE架构下的多层应用模式。并通过网上选课系统的设计详细介绍了该模式下的具体开发方案.     

Java web流行框架的了解与应用

J2EE是一种利用Java 2平台来简化企业解决方案的开发,部署和管理相关的复杂问题的体系结构。J2EE技术的基础就是核心Java平台或Java 2平台的标准版,J2EE对EJB（Enterprise Java Beans）、Java Servlets API,JSP（Java Server Pages）以及XML技术的全面支持,它由一整套服务（Services）、应用程序接口（APIs）和协议构成,它对开发基于Web的多层应用提供了功能支持。     

三国两晋南北朝数学“推类”思想散论

J2EE技术是构建基于Web系统的标准平台和环境,具有跨平台、分布式、多层结构及可复用的特点,可以便捷的开发多层的企业应用。本电子政务系统的实现基于J2EE技术,整个系统架构在工作流之上进行审批流转,工作流系统应用能够充分发挥J2EE技术的优势,提供高度的可靠性、可扩展性和安全性。     

基于J2EE模式的开发应用

基于B/S三层架构模式目前基于J2EE模式普遍应用到网站的设计开发,所设计系统可采用先进的三层结构模式的服务器、服务器结构,它是传统的客户、服务器结构的发展,代表了企业级应用的未来,典型的有B/S架构下的应用。三层架构包括界面层、逻辑层和数据层,其具有如下优点:1.系统结构清晰、逻辑与表达分离;2.性能好,能满足大规模并发访问的要求;3.修改维护方便、容易扩展;4.易于实现负载均衡。J2EE开发模式J2EE提供了一个企业级的计算模型和运行环境用于开发和部署多层体系结构的应用,它通过提供企业计算环境所必需的各种服务,使得部署在J2…     

基于Struts+Spring+Hibernate的Web开发框架及实现研究

介绍了Struts、Spring和Hibernate三种开源框架,根据J2EE的分层结构,结合Web应用的特点,整合这三种框架,设计出一个适合企业Web应用的J2EE通用架构。在此架构的基础上,通过一个简单应用实例,实现了该架构在Web系统中的应用。     

基于J2EE核心模式的组合Web框架研究

在研究多种J2EE Web框架和J2EE核心模式的基础上,提出了一种基于J2EE核心模式的组合Web框架--CWFBP(Composite Web Framework based on core J2EE Patterns)模型.框架采用分层体系架构,集成了开源的J2EE Web框架和持久层框架,并在表示层和业务层综合应用多种J2EE核心模式,实现了层次之间和业务层内部的松散耦合,提高了系统的可复用性和开放性.研究了N层计算模式、AJAX和正则表达式等在模型中的应用.采用CWFBP进行软件架构,设计实现了三峡--葛洲坝水利枢纽通航调度系统.系统运行实践表明了CWFBP的正确性和有效性.     

基于J2EE的分布式体系及应用

以分布式体系结构为核心，介绍其基本原理。着重介绍J2EE架构及相关技术，并描述一个基于J2EE应用系统的模型。对该模型的设计模式和其中业务逻辑的封装和实现进行详细论述。     

基于XML和J2EE的Web彩票发布系统

介绍了XML以及基于XML的3层C/S模型,分析了传统Web信息发布的缺点以及XML技术用于实现Web信息发布的优点.提出了应用XML技术实现Web信息发布的方法,给出了利用XML实现彩票发布系统的模型,并通过彩票发布实例展示了基于XML的Web信息发布的J2EE具体实现.     

基于Web Services的企业电子商务应用集成技术的设计与实现

在分析Web Services的体系结构和关键技术的基础上,采用基于J2EE的Web Services技术,结合标准的Web协议(HTTP、SMTP等)和XML、SOAP、WSDL、VDDI等一系列标准,给出一个企业电子商务应用集成技术的设计与实现.     

基于Web工作流的期刊协同出版系统

给出了一个基于Web的工作流引擎设计方案，以WfMC的XPDL语言为过程定义语言，用J2EE架构构建系统，并将该力案用于期刊出版，给出了学术期刊的XML数据表示，设计了实例原型．     

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)

正~~     

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).     

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.     

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.