On the Intuitionistic Fuzzy Topological Structures of Rough Intuitionistic Fuzzy Sets.- Feature Selection with Positive Region Constraint for Test-cost-sensitive Data.- A Rough Neurocomputing approach for Illumination Invariant Face Recognition System.- Variable Precision Multigranulation Rough Set and Attributes Reduction.- Three-way Decisions Versus Two-way Decisions on Filtering Spam Email.- A Three-way Decisions Approach to Density-based Overlapping Clustering.- Three-way Decisions in Stochastic Decision-Theoretic Rough Sets.

The LNCS journal Transactions on Rough Sets is devoted to the entire spectrum of rough sets related issues, from logical and mathematical foundations, through all aspects of rough set theory and its applications, such as data mining, knowledge discovery, and intelligent information processing, to relations between rough sets and other approaches to uncertainty, vagueness, and incompleteness, such as fuzzy sets and theory of evidence. Volume XVIII includes extensions of papers from the Joint Rough Set Symposium (JRS 2012), which was held in Chengdu, China, in August 2012. The seven papers that constitute this volume deal with topics such as: rough fuzzy sets, intuitionistic fuzzy sets, multi-granulation rough sets, decision-theoretic rough sets, three-way decisions and their applications in attribute reduction, feature selection, overlapping clustering, data mining, cost-sensitive learning, face recognition, and spam filtering.

Includes high-quality research articles reflecting current developments in the topics of rough sets and three-way decisions A detailed guest-editor's preface, introducing the papers in the issue, is included in the front matter and is freely available for perusal on SpringerLink Contains extended versions of seven papers presented at JRS 2012, a joint conference comprising the 8th International Conference on Rough Sets and Current Trends in Computing (RSCTC 2012) and the 7th International Conference on Rough Sets and Knowledge Technology (RSKT 2012) Includes supplementary material: sn.pub/extras