Seunghyun Im

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Action rule is an implication rule that shows the expected change in a decision value of an object as a result of changes made to some of its conditional values. An example of an action rule is 'credit card holders of young age are expected to keep their cards for an extended period of time if they receive a movie ticket once a year'. In this case, the(More)
Knowledge based query answering system takes advantage of data mining techniques to provide answers to user queries that involve incomplete or foreign attribute values. However, such process may cause a security issue when the system contains confidential data required to be protected. The confidential data as well as other values can be treated as missing(More)
An action is defined as controlling or changing some of attribute values in an information system to achieve desired result. An action reduct is the minimal set of attribute values distinguishing a favorable object from other objects. We use action reducts to formulate necessary actions. The action suggested by an action reduct induces changes of decision(More)
We present a generalization of a strategy, called SCIKD, proposed in [7] that allows to reduce a disclosure risk of confidential data in an information system S [10] using methods based on knowledge discovery. The method proposed in [7] protects confidential data against Rule-based Chase, the null value imputation algorithm driven by certain rules [2], [4].(More)