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Comment: Re:sigh (Score 1) 186

by hawk (#48665367) Attached to: An Automated Cat Litter Box With DRM

> I can make an adapter for a Gillette razor if I
> wanted to without breaking any DMCA laws.

When I was in college, Safeway's generic/house brand used the same head.

I bought those, and pulled off the heads to snap on to the better handle . . .

(these were made with nice hard metal, unlike the bic disposables which would cut my face the first time I used them)


Comment: Re:not original (Score 1) 176

by hawk (#48665345) Attached to: Uber Pushing For Patent On Surge Pricing

Not just obvious, but prior art.

Just about any market does this; the change of price brings other players in, or causes them to leave.

I wrote code for a simulation in '95 or so that had the simulated merchants applying a quadratic equation to the amount that their sales missed the sell-out quantity. It was trivial to cause markets to clear, on just that one piece of information. (In fact, at one point, due to a coding error, the product was a "bad" rather than a "good"--and it still cleared at a negative price.

The algorithm for Uber would be trivial: once the wait time goes above or below its usual band, the price adjusts by some portion per time unit (e.g., 1%/minute) until the wait time is normal. Or include lagged time periods to damp oscillations.

This is just plain trivial. I, or any other computational economist, could sit around all day kicking out new algorithms for this.

It's really pretty simple: if you sell out to quickly, or can't service all your customers, raise your prices; if you have excess, lower them. Doing it by algorithm is nothing new; the trick to patentability would be to find an algorithm that not only hasn't been done before, but is actually better than the other trivially reachable algorithms.

I drove the demand in that model various ways, whether constant, sine waves, stochastic, saw tooth, and probably others I'm not recalling off-hand. A rather simple genetic algorithm rapidly converged in all cases. Mathematically, that method was probably mathematically equivalent to large classes, possibly all, other second order and lower and lower methods or solutions--and the method rather clearly could be extended to nth order . . . (second order methods tend to be sufficient for most things).


Comment: Re:Wildly premature question (Score 1) 81

by Bruce Perens (#48620117) Attached to: SpaceX To Attempt Falcon 9 Landing On Autonomous Spaceport Drone Ship

If we look at jet aircraft, wear depends on the airframe and the engines, and the airframe seems to be the number of pressurize/depressurize cycles as well as the running hours. Engines get swapped out routinely but when the airframe has enough stress it's time to retire the aircraft lest it suffer catastrophic failure. Rockets are different in scale (much greater stresses) but we can expect the failure points due to age to be those two, with the addition of one main rocket-specific failure point: cryogenic tanks.

How long each will be reliable can be established using ground-based environmental testing. Nobody has the numbers for Falcon 9R yet.

Weight vs. reusable life will become a design decision in rocket design.

Comment: Re:Don't foget (Score 1) 186

by hawk (#48570173) Attached to: NetHack: Still One of the Greatest Games Ever Written

>Don't forget the original Hack on which Nethack is based - (basically) the same game, but on ASCII terminals (yes, I'm that old).

"tiles" is not nethack . . .

*proper* nethack is ascii only.

It was too easy to escape a two-doored shop in hack . . .

(and to this day, the "graphical" variants on nethack are gaming the ascii-based underpinnings)


"One day I woke up and discovered that I was in love with tripe." -- Tom Anderson