Abstract :
??????Why are you writing for the IEEE Consumer Electronics Society,??€ Jay asked. ??€œDon??€™t you have enough to do???€ Jay is a good acquaintance, the kind of person I try to visit every time I??€™m in his town, even though such visits usually involve a tight schedule and the demand to master a diverse and complex public transit system. After several years, I??€™ve mastered the buses and trolleys but still find the trains a mystery. I believe that I have interpreted the schedule correctly and that I am standing on the right ????platform, but then I see the train coming from a different direction and stopping on the far side of the station. Someday, I may understand how the system works, but, for the moment, I still enjoy the challenge.
