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Preface Particles do interact and that interaction usually is not negligible. This is one of the very basic things that physics teaches us. However, to know the importance of human interaction, we don't really need physics. Our daily experiences tell it loud and clear. I highly value my constructive interactions during the period of my doctoral studies. It was not an easy journey to take it alone. I am very thankful to Professor Risto Nieminen for his supports and encouragements during the timedoi:10.1109/mcs.1987.1105358 fatcat:bk5yrm2c3nb2zbg7byec3lwryi