Catch up on stories from the past week (and beyond) at the Slashdot story archive

 



Forgot your password?
typodupeerror
×

Comment Umm, I hope that translation is to blame. (Score 1) 35

I really hope that "proud to declare that we are at the cusp of a reclaiming our heritage of being connected to each other and connected to the world." made a lot more sense before some translator mangled it; because otherwise it seems like absurd nonsense. If people were connected long enough and far enough back in time for it to count as 'heritage', the technology behind those connections must have been comparatively primitive. Is he saying that communications have regressed since that time? What golden age of connectedness is he talking about?

Comment Re:Why not both? (Score 1) 239

I didn't make it suitably clear; but the 'complexity' is really more of a historical issue. The fact that you can get power transistors, digital logic, and similar solid-state goodness for peanuts, possibly even less than the carbon brushes or other electromechanical alternatives, is a comparatively recent thing in historical terms.

Now that you can, doing so is pretty compelling for any but the highest-power tasks; but it has not always been the case that you can throw semiconductors at a problem for astonishingly tiny amounts of money. Today it is; but a lot of very clever electromechanical, inductive, and similar tricks were developed during the time that it was not.

Comment Re:Low cost chip, high cost support (Score 3, Interesting) 92

What I find a bit weird about SPARC's near-total obscurity is that(please correct me if I'm wrong on the details; but to the best of my understanding from what I've read) the ISA is available for use on a royalty-free basis, and there are even a few BSD or GPL verilog implementations out there. That's even less encumbered than MIPS(which has some patents that the owners like to wave around on a couple of useful instructions).

My naive expectation would have been that SPARC on such liberal terms would show up a bit more often embedded in various chips that need some sort of CPU to do housekeeping, as the ISA of security and/or nationalism driven 'indigenous technology' efforts, and potentially even as the cheaper-than-ARM option for application processors.

Clearly that hasn't actually happened, and it's mostly ARM in SoCs and application processors(with PPC holding out in certain automotive and networking niches for some reason; and MIPS in router SoCs and the occasional Chinese vanity project); so ARM's license fees must just not sting that much.

Building SPARC parts that go toe to toe with Xeons would obviously be a much more ambitious project(as well as an act of directly fucking with Intel's juciest margins, which they probably won't take very kindly); but I am surprised by the fact that SPARC is so rare among the zillions of devices that have no need for x86 compatibility and are mostly about delivering performance in the gap between beefy microcontrollers and weak desktops for as little money as possible.

Comment Lots of room for methodology issues. (Score 2) 307

The lack of accidents and crime are more likely related to a general trend in crime going down from before they started turning off the lights. ... Give me at least one full year worth of data so I can compare it to the prior year, and have half of the country keep their lights on so It can be compared to the same time frame as well.

Hear, hear!

There's lots of room for methodology errors. Here's another:

Comparing murder rates between Great Britain and the US is complicated by differences in reporting. The US bumps the murder stat when there is a body and evidence of foul play. G.B. bumps it when they have a conviction.

Do they do that with other crime? If so, stable stats in the absence of street lighting might mean that any rise in crime is compensated for by a fall in identifying, apprehending, and convicting the criminals responsible. (Indeed, turning off the lights might easily result in LOWERED crime statistics at the same time it was causing a drastic increase in actual crime.)

Comment What hospital is that? (Score 1) 54

I'm an anesthesiologist. I put people to sleep for cardiac surgery. My hospital does around 400-500 hearts a year... and we don't kill any dogs.

What hospital is that? I'll want to avoid it if I ever need heart surgery.

Seriously: How does your cardiac unit's mortality and morbidity rate stack up against those of hospitals where practice surgery on live animal, models, at least where the surgeon is new to the procedure, is more common?

Comment Re:Disappointed (Score 2) 239

The competition for good DC-DC conversion is reasonably fierce(given the existence of DC telco and datacenter operations, and the fact that even 'AC' shops are really just doing the conversion in each chassis(and unlike the old AT PSU days, an ever larger chunk of the output power is 12v going directly to a DC-DC converter on the motherboard to feed the CPU and RAM, with fewer and fewer components, aside from HDD motors, being sufficiently high voltage to feed directly from the PSU); so even modest improvements in DC-DC efficiency would make you quite wealthy indeed.

I haven't kept a close eye; but I think that the present standard for DC-DC modules still uses a number of off-chip components(whether because the needed capacitance and such simply can't be done in silicon, or are cheaper as discretes, I don't know); but you can get some very, very, dense little modules.

Comment Re:Why not both? (Score 1) 239

Especially if you are dealing with solar-derived DC, which is going to be (reasonably) steady. For some purposes, it doesn't matter that much whether or not the voltage actually crosses zero; but the ripple is essential if you want the magnetics to work correctly. If you have to go to the trouble of switching the DC to get that working, odds are that it's time for a pure DC design.

Comment Re:Why not both? (Score 1) 239

There are good reasons to be skeptical of complexity(such as basically all software); but at least for motors small enough that solid state switching isn't heroically expensive and/or practically disposable, 'complex' and 'digital' also mean 'has convenient ways to monitor and control the motor's activity in some detail'. Simple is good; but when the complexity is in solid-state parts you get a serious discount and sometimes some cool features.

Comment Re:Why not both? (Score 1) 239

Certainly possible; but probably only efficient or sufficiently cheap for some items.

My (admittedly limited) understanding is that motors are one of the parts where you can get a relatively refined and mature design for almost any remotely normal flavor of electrical input; but the design of the motor is going to reflect your choice, and work either inefficiently or not at all from some other input. Since AC units are basically all motor(some fans, a compressor, maybe a pump), that is a problem.

Some devices just don't care very much(resistive heating works for basically anything except voltages too much lower than the system was designed for); and others(pretty much all modern electronics) always use DC internally, so you can re-use almost the entire design; but need to choose the correct PSU. Some hardware makes swapping one after the fact really obnoxious; but at very least it's an easy thing to choose at assembly time.

Comment Re:Animals (Score 1) 54

I'm an anesthesiologist. I put people to sleep for cardiac surgery. My hospital does around 400-500 hearts a year... and we don't kill any dogs.

So maybe I'm not up to date, or things are/were different in research hospitals.

My personal info was based on stories told by my mother, in about the '60s, when she was a special duty RN at the University of Michigan hospital, often handling cardiac recovery.

My favorite was the one where the UofMich hospital cafeteria, which had been purely open seating, established separate rooms for the staff to eat after an incident where patients' families overheard, and were traumatized by, a cardiac surgeon's response to a question. Asked how his operations the previous day had gone (referring to his experimental and/or practice surgery on a collie and another dog), he said "The blonde lived but the old bitch died."

The kids and adopted dogs story was from my wife. The surgeon in question was Dr. Albert Starr in (at least) the '60s through '80s. He was at St. Vincent's and also flew, with his team, to operate at a number of other west coast hospitals, university and otherwise.

Comment Animals (Score -1) 54

A possible solution would be better simulations so that a student can learn by doing. I think it is a very different than working on a cadaver or simulated patient using conventional methods.

You obviously aren't familiar with surgical departments or you wouldn't have missed practice surgeries on live animals.

For instance: a typical cardiac surgeon, shortly before EACH operation on a human patient, does a practice operation of the same procedure on a live dog.

One pediatric cardiac surgeon was much beloved by his patents and their families, because (with parental permission) he would let the kid adopt the practice dog, rather than sending it to be destroyed. The kid would wake up from surgery with the new puppy beside him, with the same bandages, etc. (and a day or so farther along in recovery). The dog having been through the same procedure and having helped save the kid's life even before they met made for very strong owner/pet bonds. (There's always a live, healthy, practice dog. If the dog dies (or is severely damaged) the assumption is that the procedure failed. You DON'T do a procedure on a human if it just killed a dog. You analyze, adjust the procedure, and repeat until success.)

Getting skills up does NOT require, or usually involve, a lot of practice on JUST advanced simulations, cadavers or, live patients. The live patients are just the last step, when the skills are already finely honed, and the animal models provide immediate feedback, real situations, and automatically correct modelling of mammalian life processes.

Slashdot Top Deals

THEGODDESSOFTHENETHASTWISTINGFINGERSANDHERVOICEISLIKEAJAVELININTHENIGHTDUDE

Working...