This book constitutes the thoroughly refereed post-proceedings of the First International Conference on Hybrid Information Technology, ICHIT 2006, held in Jeju Island, Korea, in November 2006.

The 64 revised papers were carefully selected during a second round of reviewing and improvement from 235 reports given at the conference and are presented in extended version in the book. The papers are organized in topical sections on data analysis, modeling, and learning; imaging, speech, and complex data; applications of artificial intelligence; hybrid, smart, and ubiquitous systems; hardware and software engineering; as well as networking and telecommunications.

We would like to present, with great pleasure, the ?rst volume of a new jo- nal, Transactions on Rough Sets. This journal, part of the new journal subline in the Springer-Verlag series Lecture Notes in Computer Science, is devoted to the entire spectrum of rough set related issues, starting from logical and ma- ematical foundations of rough sets, through all aspects of rough set theory and its applications, 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, theory of evidence, etc. The ?rst, pioneering papers on rough sets, written by the originator of the idea, ProfessorZdzis lawPawlak, werepublishedintheearly1980s.Weareproud to dedicate this volume to our mentor, Professor Zdzis law Pawlak, who kindly enriched this volume with his contribution on philosophical, logical, and mat- matical foundations of roughset theory. In his paper Professor Pawlakshows all over again the underlying ideas of rough set theory as well as its relations with Bayes' theorem, con?ict analysis, ?ow graphs, decision networks, and decision rules.