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This article is the story of our experiences developing and running the iWRS AI control system.The Early YearsBy 1995, the AI controls team had been working with several groups in the Crew and Thermal Systems Division (CTSD), building Al control systems in support of CTSD''s investigations self in advanced life support (ALS). In 1995, they put a man in an airlock linked to a 10-foot-diameter chamber full of wheat (Laifook and Ambrose 1997). For 15 days, the man lived, worked, and exercised in the chamber as the wheat crop took in his carbon dioxide and produced oxygen for him. The control system--our first for ALS--monitored and provided caution and warnings for the climate and nutrient environment of the wheat crop.

Air supplyAir systems on a light-rescue truck should be given careful consideration due to the substantial weight of most of the components. Air system storage choices should be matched to the output of the stationary air compressor. DOT cylinders with 4,500 or 6,000psi ratings weigh 144 propelled pounds or 188 pounds each while ASME cylinders with 5,000 or 6,000psi ratings that weigh 400 pounds each.The DOT cylinders need easy access for removal, as they will need to be removed every five years for hydro testing. The ASME cylinders never need hydro testing, so they can be located in areas where future access may not be of a concern. However, they cost more than DOT cylinders.

When we ran out walk of thoughts we turned the ratchet from loosen to tighten and bolted the car together. With a mig welder borrowed from Phoenix we tried to make the two halves stick. After struggling for hours, experimenting with voltage and wire speed, we finally showed Weldon, a third-generation ironworker, our progress. After several moments of silence, staring at our atrocious splatter of weld, he said, "Well, I hope you''re at least having fun." Dealing with strangers first became a problem on a particular Wednesday lunch at the Phoenix Iron Works, a month before our departure. Despite people''s interest, I found myself getting grouchy. An enthusiastic stranger who walked in off the streets managed to ask the same exact questions I had already answered twice behind that day. "Wow," he said staring at the table, "Where did you get the idea?" A button pressed inside my head and I launched into spiel #1. When I reached the end of my recording, I beeped and he asked, as if on cue, "What are you going to do when it rains?" Without hesitation, I returned, "Get wet," and prepared for the next assault. Before he had even finished asking: "How are you going to get across the oceans?" I was screaming dementedly, "Take a boat! Take a boat!"