Master Degree / Yüksek Lisans Tezleri

Permanent URI for this collectionhttps://hdl.handle.net/11147/3008

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  • Master Thesis
    An Exact Approach With Minimum Side-Effects for Association Rule Hiding
    (Izmir Institute of Technology, 2014) Leloğlu, Engin; Ayav, Tolga
    Concealing sensitive relationships before sharing a database is of utmost importance in many circumstances. This implies to hide the frequent itemsets corresponding to sensitive association rules by removing some items of the database. Research efforts generally aim at finding out more effective methods in terms of convenience, execution time and side-effect. This paper presents a practical approach for hiding sensitive patterns while allowing as much nonsensitive patterns as possible in the sanitized database. We model the itemset hiding problem as integer programming whereas the objective coefficients allow finding out a solution with minimum loss of nonsensitive itemsets. We evaluate our method using three real datasets from FIMI repository and compared the results with previous exact solution and the heuristic study whose procedures are imposed by new approach. The results show that information loss is dramatically minimized without sacrificing so many modifications on databases.
  • Master Thesis
    A Mathematical Modelling for Manpower Planning
    (Izmir Institute of Technology, 2001) Uludağ, Mehmet; Koltuksuz, Ahmet Hasan
    Information systems are one of the most important tools for organizations to conduct business today. The dependency of organizational functions to information systems makes them critical for the people using them. So becomes the impact of failure or success of information systems more significant in organizations. The initial task for information systems designers is to appreciate this real life situation and understand various aspects of information systems and their evolution over the past decades.Information system design is a detailed process which has to be planned and implemented with great care not only for, but also with the business experts and users. Designers and users should be aware of the problems, requirements within the organizational context. In this thesis, we will describe and discuss various information systems in organizations. Different information system types will be given.Database management systems (or databases in organizations) are the essential parts of information systems. A "good" information system is surely backed up with a "good" database behind it. Designing a "good" database systems is the critical part of the process. Following structural and well defined methods on database design is something we need in today in organizations. We will present, further in this thesis, various database management systems and database types. Relational model is the most widely used database management system today. We will study various relational database model concepts which will be a base for our management information system database design. We will follow various design and refinement methodologies to end-up with a well documented and refined relational database model. During our design we will utilize a sophisticated database design tool. We will use the database design tool Sybase PowerDesigner. Our design will be modeling a man-power planning database ..