Preface VIIIEngaged in this interdisciplinary research, I have had opportunities to participate in both the research communities of conceptual graphs and fuzzy logic, and met with the colleagues and students whom I would like to thank for their contribution to this book in one way or another over the years:-Vilas Wuwongse and Peter Creasy, my Master's and PhD advisors, for their guidance at the beginning of my research. -James Baldwin, Trevor Martin, and Jonathan Rossiter for the valuable period of the Fril++ project in which I applied the developed order-sorted fuzzy set logic programming theory. -Lofti Zadeh and Masoud Nikravesh for hosting my research visit at BISC when I first came up with the idea of using fuzzy conceptual graphs for the Semantic