综合信息系统的质量驱动查询结果Quality-Driven Query Answering for Integrated Information Systems azw3 极速 下载 snb txt pdf pdb 夸克云

The Internet and the World Wide Web are becoming increasingly important in our highly interconnected world. This book addresses the topic of querying the data available, with regard to its quality, in a systematic and comprehensive way, from a database point of view. First, information quality and information quality measures are systematically introduced before ranking algorithms are developed for selecting Web sources for access. The second part is devoted to quality-driven query answering, particularly to query planning methods and algorithms.

The in-depth presentation of algorithms and techniques for quality-oriented querying will serve as a valuable source of reference for R&D professionals and for IT business people. In addition, the work will provide students with a comprehensible introduction to cutting-edge research.

Part I. Querying the Web

Introduction

Centralized Databases Vs. the World, Wide Web

Information Quality on the Web

Problem Definition

Thesis Outlines

Integrating Autonomous Information Sources

The Mediator-Wrapper Architecture

The Universal Relation

Information Overlap

Applications

Related Work

Summary

Part II. Information Quality

Information Quality Criteria

Information Quality Criteria for the Web

Information Quality Assessment

Summary

Quality Ranking Methods

Quality Model

Scaling Methods

User Weighting

Ranking Methods

Comparison and Evaluation

Summary

Part III. Quality-Driven Query Answering

Quality-Driven Query Planning

Logical Query Planning

Attaching Quality Reasoning to Query Planning

Integrating Quality Reasoning and Query Planning

Related Work

Summary

Query Planning Revisited

Shortcomings of Conventional Query Planning

Merge Operators

Revised Logical Query Planning

Related Work

Summary

Completeness of Data

A Completeness Measure for Sources

A Completeness Measure for Plans

Properties of the Measures

Other Overlap Situations

Related Work

Summary

Completeness-Driven Query Optimization

Completeness Maximization

Maximizing Coverage

Maximizing Completeness

Algebraic Reordering

Summary

Part IV. Discussion

Conclusion

Summary

Further Applications for IQ-reasoning

An Appeal

References

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The Internet and the World Wide Web are becoming increasingly important in our highly interconnected world. This book addresses the topic of querying the data available, with regard to its quality, in a systematic and comprehensive way, from a database point of view. First, information quality and information quality measures are systematically introduced before ranking algorithms are developed for selecting Web sources for access. The second part is devoted to quality-driven query answering, particularly to query planning methods and algorithms.The in-depth presentation of algorithms and techniques for quality-oriented querying will serve as a valuable source of reference for R&D professionals and for IT business people. In addition, the work will provide students with a comprehensible introduction to cutting-edge research.