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Comment Re:ARM computers (Score 5, Insightful) 321

Woah. Woah. Woah. Woah. Woah.

I will let people crap all over a post that's basically regurgitating Intel Developer Forum drivel, and I'm certainly not going to say that WinRT has a future.

But I will NOT let you trash talk Alpha.

The Alpha was simply a much better processor than anything from Intel at the time. It was pretty much the fastest out there, though you might argue with some high end POWER or MIPS 10K or something.

Maybe you were running Windows and x86 programs on the Alpha? Those weren't blazing. But native Alpha programs were fast fast fast. And the architecture is clean and beautiful. Just beautiful.

So you can say that ARM has not much advantage over x86 today. That's probably true. You can say that ARM sucks, has too much complexity, and the system architecture is an abomination. That's probably true also. But you leave the Alpha out of your talk unless you know what the hell you're talking about.

Comment Re:Watching the video (Score 1) 127

Your "1ST rule of Rocket Engineering" can also be stated: You always develop sub-optimal rockets.

Seems like a stupid rule to me.

If an engine goes out, or there is some other problem, you need extra fuel to accomplish the mission (increased gravity drag). So you have some extra fuel and extra delta v, and that's a good thing.

But if those events are rare -- and, eventually, they should be -- then you often have extra fuel. If you can use that fuel to return the craft intact to reuse and make more money, then I think that's a damn good idea. If you must burn the extra fuel, then you will lose the stage. It will cost the company more, but "less profit" is maybe an OK choice.

The goal is to optimize cost while maintaining very high reliability. For very high reliability, you need to understand worst case behavior. For optimizing cost, you need to make the common case cost efficient. Having extra delta v for anomalies and using that delta v to lower launch cost (via reuse) when no problems arise seems like smart engineering to me.

Comment Do you have a CLEARANCE, Clarence? (Score 1) 207

You probably have a clearance. This is very valuable to many employers. Make sure you have that at the top of your resume.

Seriously, though, Clearance + EE is quite valuable. If you're worried about seeming "rusty" on the engineering side, get a MSEE from some university... a lot of very good universities have distance programs where you might be able to get started early.

Comment Proposal: Sensitivity Hats (Score 4, Interesting) 759

There seem to be two groups of people here:

The first group of people is not offended by jokes, including jokes influenced by sexuality.

The second group of people is offended by jokes, especially jokes influenced by sexuality. A subset of this group is offended by such jokes when spoken by members of a certain gender. Of course, this is discriminatory so we will ignore that aspect and categorize them as offended in general.

I think there is a desire to be respectful of the second group while avoiding strict censorship of the [majority] first group.

I suggest a clearly visible sign that someone is offended by jokes influenced by sexuality (or, perhaps broadening this to include all jokes?). Perhaps a yellow hat or something like that. People within earshot of such people should refrain from telling such jokes. People wearing the sensitivity marker who hear things offensive to them can raise the issue to convention staff who will attempt to deal with the issue. People wearing the "sensitivity" marker who make such jokes will permanently lose the right to wear them.

People not wearing the sensitivity marker who hear something offensive to them should either (A) indicate to the offensive person directly that their conduct is perhaps inappropriate, or (B) move away from the offensive person so that they are no longer offended. If (A) is ineffective and (B) is ineffective or impossible the convention staff can be notified and they may or may not choose to act; anyone not wearing a sensitivity marker who is upset is free to go put on a sensitivity marker.

People may wish to have activities which may include things that people find offensive, they are free to ban sensitivity markers. Additionally, "sensitivity-marker free zones" or "automatic sensitivity marker" zones could be created. Or even entire conventions where no sensitivity markers are allowed -- one would expect a crude joke convention to probably not cater to overly sensitive people.

Of course, in an ideal world, everyone would be adult enough to know to watch their language a little bit, and to not overreact a lot. But given that certain people are especially sensitive for various reasons, we should find a way to allow them to coexist with the rest of society.

Comment Interesting intersection of Patent and Copyright (Score 4, Interesting) 225

It's usually hard to copyright a "thing". If you make a thing -- a new type of shelving or gun or glass or pen or chair or whatever -- you can't get a copyright on it, you can maybe get a patent on it.

So for a CAD file of a gun, the CAD file could be copyrighted... but it would be copyrighted by the author, not by the manufacturer of the gun it was a clone of (unless they were the author, of course). Now, printing out the gun might be manufacturing something covered by patents... but copying the file wouldn't be creating the gun.

3D printing will sure be interesting from a legal standpoint, it potentially brings copyright and patent law together for just about everything. I would hope that we could establish that CAD files for 3D printers are equal to recipes for the purposes of copyright: a series of steps to create something. But that's certainly not what happened for source code.

Comment C=B*log2(1+SNR): It's not just a good idea... (Score 3, Insightful) 60

It's the law!

And you're getting very close to the Shannon limit with turbo codes. LTE isn't much more spectral efficient as compared to HSPA+, but it has wider frequency bands and so can get more peak speed to customers.

So you can increase the amount of spectrum you have, with the current infrastructure, to get more capacity. That will buy you a few years of network traffic increase.

But eventually you have to figure out how to get less capacity demand and more SNR. There's really only one way to do that: change the infrastructure topology. And that has lots of problems.

It's kind of like we're near "Peak Bandwidth".

Comment Ask Drew Curtis (Score 1) 214

Of He recently had to defend against one of these patent trolls. His advice on a TED talk was (if I recall): fight the infringement, not the patent. His response with a lawyer was actually pretty cheap, and asked the plaintiff to circle the infringement and to disclose various things about the shell company. The other side doesn't want battle in court, either. Drew settled for nothing.

Comment C is great (Score 4, Insightful) 793

  • It is much more portable than assembly
  • The performance overhead compared to assembly is reasonable
  • Most people find it simpler to develop in than Forth
  • It's not the horrible monster that C++ is

This makes it very nice for all kinds of embedded environments.

Efficiency matters. Python is great, but you don't want to use it for embedded work.

Comment He's mostly right (Score 5, Insightful) 406

All those scalar processors look the same. You can trade energy efficiency for performance and end up with a lower power processor that's a lot slower. When you push the performance, the architecture doesn't matter as much, because most of the energy is spent figuring out what to run and when to run it.

Compounding this fact, ARM isn't that great of an architecture. It's got variable length instructions, not enough registers, microcoded instructions, and a horrible, horrible virtual memory architecture.

The big thing that ARM has is the licensing model. ARM will give you just about everything you need for a decent applications SOC. Processor, bus, and now even things like GPU and memory controllers. Sprinkle in your own companies' special sauce, and you have a great product. All they ask is for a little bit of royalty money for every chip you sell. And since everyone is using pretty much the same ARM core, the tools and "ecosystem" is pretty good.

But there's not much of an advantage to the architecture... the advantage is all in the business model, where everyone can license it on the cheap and make a unique product out of it.

And nowadays, the CPU is becoming less important. It's everything around it -- graphics, video, audio, imaging, telecommunications -- is what makes the difference.

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