- #36
rootX
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Astronuc said:Back in the early 80's, while in grad school, I proposed parallel processing (with mainframes) where one system would solve one part of a complex computational problem, while others would solve other parts. I was told that wouldn't work and was a silly idea that would not go anywhere. Parallel processing of complex problems is now done, not on mainframes, but as distributed processing on workstations, PC's or parallel microprocessors.
My other 'silly' idea was digital books - kind of like Amazon's Kindle. Pdf's on a notebook would be similar.
At the time, the problem was one of microprocessor power and storage. A lot of progress have been made in 2.5 decades.
skeptic2 said:Shortly out of school I was asked to design a temperature controller for a tank of hot wax (180 F). The problem was how to avoid over shooting the set temperature. Since the temp sensor was to be some distance from the heating element there would be a time delay between the heating element reaching the correct temperature and the sensor detecting it. I finally hit upon the idea of adding the rate of change of the temperature to the temperature and comparing that sum to the set point. This would shut off the heating element earlier when the temperature was rising faster.
I began to wonder what would happen if I also added in the integral of the temperature and discovered it not only increased the accuracy but since the integral and differential of a sine wave are out of phase, using both of them would tend to eliminate any oscillation. I worked out the math and it looked like a perfect solution but the project was canceled and I never built it.
Some years later I was looking for a job and my potential boss asked me if I new what a PID controller was. I answered no and he gave me a short explanation. I felt like telling him I had invented it (well reinvented it) it but realized that after having already told him no, he probably wouldn't believe me.
I don't want to make these mistakes :)