信息安全平台的实现与应用

在分析铁路业务模式的基础上,论述了铁路专用信息安全平台的设计思路,以及数据库系列、MQ模式、P2P模式的实现原理。列举了信息安全平台的典型应用,如在铁路调度信息系统中的应用和在专线模式中的应用。提出的网络安全防护理念的信息安全平台,能适用于多种业务模式下的信息交换。     

铁路车站能力计算综合集成系统的研究

现行铁路车站能力计算反映的是车站一昼夜内各项作业均衡进行时的能力情况,为适应铁路运输全面走向市场的要求,综合车站能力查定的行业规范、传统经验、理论成果等,研究开发了集计算、优化与信息管理于一体的车站能力综合集成系统,使车站能力计算查定趋于简单实用。     

分布式数据库技术在铁路局供电管理中的应用

郑州铁路局在电气化铁道的供电系统中应用“铁路牵引供电管理信息系统”(EMIS)实现了联网管理、信息共享。对于这种异地数据的应用处理面临着数据同步、数据共享、并行处理、数据传输等4个主要问题,为此EMIS采用了适合于现有网络条件的分布式数据库技术。在分析分布式数据库面临的安全问题的基础上,介绍了EMIS采用的安全保密措施,并针对其不足提出了有关建议措施。     

Extending multi-tenant architectures: a database model for a multi-target support in SaaS applications

Multi-tenant architectures (MTAs) are considered a cornerstone in the success of Software as a Service as a new application distribution formula. Multi-tenancy allows multiple customers (i.e. tenants) to be consolidated into the same operational system. This way, tenants run and share the same application instance as well as costs, which are significantly reduced. Functional needs vary from one tenant to another; either companies from different sectors run different types of applications or, although deploying the same functionality, they do differ in the extent of their complexity. In any case, MTA leaves one major concern regarding the companies’ data, their privacy and security, which requires special attention to the data layer. In this article, we propose an extended data model that enhances traditional MTAs in respect of this concern. This extension – called multi-target – allows MT applications to host, manage and serve multiple functionalities within the same multi-tenant (MT) environment. The practical deployment of this approach will allow SaaS vendors to target multiple markets or address different levels of functional complexity and yet commercialise just one single MT application. The applicability of the approach is demonstrated via a case study of a real multi-tenancy multi-target (MT²) implementation, called Globalgest.     

Evaluating the performance of higher education institutions in Europe: a nonparametric efficiency analysis of 944 institutions

Although a long tradition exists of studying the economics of education, performance comparisons of different kinds have traditionally been difficult to undertake. An important impediment has been the lack of comparable data. To a large extent, this study remedies the shortcomings of earlier studies. Our contribution is twofold. First, the current higher education policy of contraction and economizing, common to most European countries, make knowledge of potential efficiency gains crucial. Second, a unique database allows us to study a broad diversity of organizations as well as organizations located in a number of different European countries. The study suggests evaluating higher education institution (HEI) performance in a production theory context, applying the well-known data envelopment analysis (DEA) method to a cross section of 944 HEIs in 17 European countries. The DEA approach is particularly suitable in this context where little is known about production technologies and economic behaviour of the HEIs. On average, provision of education is found to be most efficient in the Slovak Republic followed by Belgium and Latvia, while Denmark and Norway display the lowest efficiency. The study also indicates a positive relation between efficiency and HEI size and efficiency and research intensity. Furthermore, the study points to the importance of continued data collection.     

信息工程中主题数据库的规划与设计

主题数据库是信息化建设的重要内容之一;首先,运用数学的语言对主题数据库的规划进行了描述;然后介绍如何通过计算信息系统中各个实体间的相关系数来进行主题数据库的规划;最后,提供了用全域系统体系C—U矩阵和主题数据库的质量评估函数对规划出来的主题数据库进行评估的方法。     

数据挖掘方法在传统预测模型中的应用

数学建模领域中,对于解决不同类型的预测问题有一些经典的预测模型。最近日益流行的数据挖掘技术也有一些针对解决预测问题的独特的数学模型和建模方法。在此对使用传统解析式模型的预测方法与应用数据挖掘技术的数据库模型的预测方法进行了对比,重点分析了2种方法在影响因素的确定、数据规律的寻找方法以及模型侧重点选择上的不同之处,并简单讨论了如何结合2种模型的优点,将数据挖掘技术应用于传统解析式模型的建模过程之中,对已有的解析式预测模型进行改进,进而得出更加可靠准确的预测结果。     

物流本体数据库的应用研究

文章以利用Protege和SQL Server 2000相结合,构建物流本体数据库为例,充分利用DBMS特点,弥补检索与匹配BDF或OWL本体数据效率低的不足,给出创建与应用本体数据库的模式,为物流领域的不同企业、不同部门之间管理语义异构、结构异构的数据提供了一种全新的方式,并体验物流本体技术在物流领域的应用价值.     

图纸管理信息系统的设计与实现

介绍了利用数据库、网络、计算机辅助设计(CAD)和条形码等计算机技术开发图纸管理信息系统的方法。通过企业局域网(Intranet)实现了图纸的网络化管理。     

大学生健康与医保信息系统的研究及数据库设计

本文主要论述了大学生健康与医保信息系统的设计与开发,首先分析系统功能,然后着重阐述了数据库部分的开发,在实现系统功能的基础上指出了存在的不足和建议。