Follow Slashdot blog updates by subscribing to our blog RSS feed

 



Forgot your password?
typodupeerror
×

Comment Re:Does it work ? (Score 3, Insightful) 186

Your way of thinking is nice, but it is exactly this attitude that gets developers fired (or their bosses broke if they share that attitude and don't fire you, in which case an inferior insecure competing product will dominate) for thinking too much instead of getting the product out. That's why we are up to the neck in inferior goods, protocols just being one example. Not even death penalty (e.g. for melamine in chinese milk) does seem to stop this.

Comment Re:GPS? (Score 1) 218

> Human beings have no business driving

I agree (I hate it when I have to drive). With robo-cars, there is another problem: Lots of traffic laws are routinely and massively broken. In .de (and probably everywhere), the law fixes a minimal safety distance for different speeds and types of road - and the real distance that the drivers keep is a third to a half of that. This is not just bad behavior - tripling the distance would cut the capacity of the road to a third (unless you triple the speed as well, which would not increase safety either), and there are just not enough roads for that (one would need three times the area for roads as well).

Now, if a robot drives a car, he has two options: Follow the law, cause a traffic jam behind himself (or even provoke somebody to cut into the seemingly extremely long clearance) and be hated by everybody; or drive like everyone else and be sued out of business if something bad happens.

Comment Re:Too soon (Score 1) 218

As others already wrote, there is an efficient way to use all lanes and merge directly before the obstacle. But this is not the question - the antisocial personality of those people enables them to afford such luxury cars in the first place. Here in .de, seeing cars of certain brands (those with "builtin right-of-way") automatically means "CAUTION!". Googling for "Wiehltalbruecke" helps.

Comment Re:Who is it for? (Score 1) 325

There is no equally-named Kemp on arxiv.org (there is a "R.Kemp", where "R." seems to stand for "Roger" in two solid-state chemistry/physics papers), and there are no google hits with his name and +site:.edu.

On http://www.superprincipia.com/About_The_Author.htm is the author's CV, he is essentially a radar engineer (probably a good one given the companies he worked at), and worked as a math teacher at some time. In the autumn of 1989 he suffered an attack of Holy Spirit and seems not to have recovered yet.

Unfortunately the website gives no sample chapters for download. I'd expect the book to be a stylistically pleasant reading, but I cannot tell if the hard core physics stuff is correct (and free from esoteric stuff). When in doubt, I'd stick with Penrose (his two-volume book with Rindler is great, his popular stuff as well (except when he tries to push his unorthodox interpretation of quantum mechanics)).

The wensite says the book requires "basic understanding into algebra, geometry, differential calculus, and integral calculus". Since that little math is not even sufficient to understand the currently generally accepted theories of physics (one needs at least differential geometry, algebraic topology, functional analysis and Lie groups for even the simplest things), I have some doubts whether the book really *explains* physics or just tells a story *about* physics.

The fact that he has no PhD should not matter (he seems not to want one), and even Einstein got PhD his only a year after Special Relativity.
His paper about photons is mostly prose with very few equations in between, and sounds strange (to say it mildly), which has already been mentioned by other commenters here.

Meta-question: Why is "Post anonymously" next to the checkbox written in white on white background? Buggy CSS or broken browser?

Comment Re:I see nothing snake-like here.. (Score 1) 90

The twisting on the ground looks like an attempt at sidewinding, but the videos at the linked site show that the robots can do that properly (maybe they need a good ground for that - but sidewinding *is* for flat grounds whereas undulation is OK for crawling among vegetables).
Rolling (both on the ground and as a method of climbing trees) is not that bad - it is easy for robots but hard for real snakes (whose scales are specialized for locomotory use only on the ventral side).
Btw., Gavin Miller (http://www.snakerobots.com/S3.html) made a working sidewinder back in 1996.

Comment Re:False assumption (Score 1) 814

This might work in languages where indentation is just for humans. In Python, where indentation matters, tabs are evil (you would need to *know* how wide was a tab in the machine of the guy who wrote the code in order to read or edit it). This information usually is not part of the source (unless the author inserted a file variable (i.e.
"# -*- tab-width: 7 -*-")).

Slashdot Top Deals

Genetics explains why you look like your father, and if you don't, why you should.

Working...