Krzysztof Czajkowski

AdaBoost Ranking Results Improvement by Pairwise Classifiers for Web Page Classification

The article concerns the analysis of information describing the web pages. The aim of the analysis is to support the process of their classification. Pages belonging to the specific class are characterized by the similar ‘style’ in terms of the form or the type of content presentation. Various characteristics are taken into account including inter alia, structural, visual, text, web and links features. During the construction of classifiers the AdaBoost algorithm was applied to create ranking list of classifiers. Then the pairwise classifiers were used to improve final classification. The paper presents the implementation of this solution and the results of experiments.

Entitlements management using Oracle Entitlements Server

The article describes an issue of integrated entitlements management on the base of Oracle Entitlements Server. The paper introduces IBM Tivoli Security Policy Manager and Novell Access Manager systems as well.

Independent data partitioning in Oracle databases

Data partitioning plays an important role in the designing and implementation of advanced database solutions. Due to the performance, protection and flexibility in administration, such a solution has very wide applications in databases and data warehouses. This option exists in many servers, but in the case of commercial systems it is available only in the most expensive versions. In this paper, the authors’ implementation of partitioning is presented. This implementation can be used in the version of database servers that do not offer a native partitioning option.

Automatic query rewrite using materialized views in operations optimization in databases

The article discusses the operation of automatic query rewriting and its application in the optimization of the commands in the database. Solutions of this type allow you to significantly shorten the execution time of complex queries in complex systems, data warehouses and analytical environments. The article discusses the issues of additional mechanisms helpful in assisting the tuning process of rewriting queries, including analysis of views and queries, as well as statistics. Experiments were performed in selected database environments and their results are presented in the article.

Web pages classification using boosting algorithm

The article concerns the analysis of information describing the web pages. The aim of the analysis is to support the process of their classification. Various characteristics are taken into account including inter alia, structural, visual, text, web and links features. During the construction of classifiers the AdaBoost algorithm was applied. The paper presents the implementation of this solution and the results of experiments.