Data quality awareness: a case study for cost optimal association rule mining

The quality of discovered association rules is commonly evaluated by interestingness measures (commonly support and confidence) with the purpose of supplying indicators to the user in the understanding and use of the new discovered knowledge. Low-quality datasets have a very bad impact over the quality of the discovered association rules, and one might legitimately wonder if a so-called “interesting” rule noted LHS→ RHS is meaningful when 30% of the LHS data are not up-to-date anymore, 20% of the RHS data are not accurate, and 15% of the LHS data come from a data source that is well-known for its bad credibility. This paper presents an overview of data quality characterization and management techniques that can be advantageously employed for improving the quality awareness of the knowledge discovery and data mining processes. We propose to integrate data quality indicators for quality aware association rule mining. We propose a cost-based probabilistic model for selecting legitimately interesting rules. Experiments on the challenging KDD-Cup-98 datasets show that variations on data quality have a great impact on the cost and quality of discovered association rules and confirm our approach for the integrated management of data quality indicators into the KDD process that ensure the quality of data mining results.     

电力企业数据仓库中元模型的研究

公共仓库元模型(CWM)标准为数据仓库和业务分析领域中所使用的元数据定义了一种通用语言和交换机制,并且为构造和描述一个完整信息供应链(ISC)提供所需元数据的语法和语义,可以有效地实现软件组之间互操作,降低系统复杂度、节约开销、提高数据仓库的运行效率。文章阐述了CWM体系结构方面的基础知识,并把CWM标准引入到电力企业数据仓库中,对关系型元数据进行了建模,把概念模型转化为CWM模型,并用XML文档进行了描述,最后生成关系型的概念模型。     

OCFS：一种基于对象存储结构的可伸缩高性能集群文件系统

提出了一种基于确定性随机分布算法分布元数据和数据对象的可伸缩集群文件系统结构。其中目录路径属性与目录对象分离的元数据管理方法，在提高系统性能、均衡元数据分布和减少元数据迁移等方面具有明显优势。提出的基于动态区间映射的数据对象布局算法，支持权重分布和副本，在均衡数据分布和最少迁移数据方面都具有统计意义上的最优性，有效解决了动态存储系统的数据均衡分布与可伸缩性问题。     

On Leverage Points for Curbing Corruption

Abstract

Certain details of the origin of corruption and appropriate counter-corruption measures at the level of individual in society are discussed. The systems approach to consideration of this problem allowed to formulate several statements about treating corruption. The most general of them is the following: the Ackoff’s conclusion that “corruption prevents society from development” must be supplemented by the statement that “development of society prevents it from corruption.”     

通用网站内容管理系统模型的研究

随着互联网的飞速发展,人们对网站的需求大大增加。同时,网站维护比较困难,需要专业的技术人员经过较长的时间才可以完成一次更新。网站信息呈现爆炸式的增长,如何有效的管理这些信息成为网站的难题。网站内容管理系统就是为了解决以上出现的问题,其核心功能是使用户能够快速开发、维护和管理高性能的动态网站。文章实现一个比较通用的模型以解决以上问题。     

黄河防洪调度综合决策会商支持系统建设

将已建防洪业务应用系统和其他相关数据作为数据源,采用科学的数据组织处理方法,围绕黄河防洪调度综合决策会商支持系统会商主题定制出满足防汛会商需要的丰富信息,最终将各类防汛信息和相关应用系统的计算成果以形象直观的形式展现给会商决策者,辅助领导和专家进行判断。该系统已应用于防洪、防凌、调水、调沙及水资源调度管理工作中,发挥了重要作用。     

塔河油田高含硫井产液剖面测井工艺研究

塔河油田已经开发的区块不同程度地含有硫化氯气体，甚至有些区块含量极高。硫化氯气体不仅严重威胁着人们的生命安全，而且还会造成环境污染。同时，它对金属设备、工具也将造成严重的腐蚀破坏。认真研究硫化氢腐蚀机理，对于保护测井设备，降低施工隐患。提高测井时效具有十分重要的意义。     

采暖散热器的选择探讨

阐述了采暖散热器的市场状况，从氧化腐蚀、碱性水腐蚀及氯离子、硫酸根离子腐蚀等方面分析了散热器被腐蚀的原因，提出了工程设计中选择采暖散热器的几个要点，以增加整个采暖系统运行的稳定性。     

加强反腐倡廉建设的几点思考

推进反腐倡廉建设，必须加强反腐倡廉教育，从根本上促进党员干部廉洁从政。在加强教育的同时，制度体系的建设，有力的监督机制，严格的惩治措施，都将从源头遏制腐败现象的滋生蔓延。     

Constructing Multilevel Metadata Networks for Sharing Dispersed and Transient Information in a Mobile Environment

An intelligent multi-user mechanism has been prototyped at the Information System Collaboratory of the Pennsylvania State University, which is capable of resolving global queries with differing and overlapping information needs, spatial scalability and temporal assumptions. The sources of information for this prototype are mechanical damage monitoring sensors embedded in equipment at plant sites, on-board ships or aircrafts, archived historical and diagnostic databases like those available through NALCOMIS (NAVMASSO document J-004 EM-001C, 1995) logistics and maintenance databases at depots, interactive electronic technical manuals stored in databases, dynamic models of damage, and models of operational performance. The concept-of-operation includes mobile access to this information by equipment maintainers on-board ships, aircrafts and other mobile platforms. Real-time interoperation of these system components and databases, under dynamic equipment operating conditions of thermo-mechanical and environmental stress, requires complex interactions of internal representations of sensor data, performance requirements, resources and equipment models, with rich semantics. To support such interactions, following the work of Bright, Hurson and Pakzad (Bright, Hurson, and Pakzad, Transactions on Database Systems, Vol. 19, No. 2, pp. 212–253, 1994) local schema terms of available data sources are organized as the leaf nodes in a semantic network of metadata. The physical nodes of the network are partitioned into a top-down multi-level search control structure of increasing precision and decreasing semantic aggregation. Each physical node supports search through all lower layers of metadata in connected tree configurations. The resulting multilayered semantic network is modeled as a Thesaurus of terms T and relationships R. A relationship in R may be crisp or fuzzy. The DTIC (Defense Technical Information Center) thesaurus for equipment maintenance was used as a starting point in this work. It was further enhanced by application specific terms and endowed with a distance function. This distance function is used to formulate user adaptable Graphic User Interfaces (GUI) for making quality of service tradeoffs in the resolution of global queries.Step-by-step construction of the thesaurus as a multilevel metadata network, its scalability, dynamic adaptation through usage, and tolerance of semantic imprecision in query resolution are discussed in this paper. Furthermore, performance metrology for evaluating quality of service in global query resolution is also developed (Phoha, in Proceedings of the NIST Workshop on Advancing Measurements and Testing for Information Technology, Gaithersburg, MD, Oct. 1998).This work was funded by DARPA for the past four years under grant DE-FC36-94G010064, for establishing a National Information Infrastructure Testbed for Electronic Commerce in equipment health monitoring, failure diagnosis and prognosis services.