Amiga 500's had T-10 screws in them. I remember spending some obscene amount of cash (like $25) on buying a screwdriver for mine when I was about 11 so I could upgrade the memory to 2 megs. oh well, back in the day.
I would imagine that eBay moved to HP servers because HP has the closest alliance out of all the UNIX hardware vendors with Zeus technology, the company that makes the web server that eBay uses. For a company such as eBay the downtime reduction that that alliance might yield would be worth the transition cost.
just a note, in case anyone is wondering what I am talking about when www.ebay.com is shown to be running IIS by netcraft. They run IIS/NT for the pretty Frontpage stuff, but have a look at the guts of the site: search.ebay.com . That's running Zeus 3.3.
anyone else suddenly have an urge to comply with the rules when they link to PSU. Hmm, let's say that the director of University relations can deal with one linking request every 30 seconds. I think that we can keep him busy for, say, the rest of his career.
Dear STEPHEN J. MacCARTHY, In your ridiculously titled role of executive director for university relations at Penn State University, would you deign to allow me to post a link on the Slashdot.org news forum to PSU's homepage at http://www.psu.edu. Pkease note that my posting on the forum will only be available to the world for a few weeks, and only within easy access for the next day or so. Also please be aware that I am not the owner or operator of the site "slashdot.org", and the your link would meerly appear as a comment in the open forums. As such it is owned by me, though given my inclinations to free speech, I would grant everyone free, accredited, rights to reproduce it.
yes, it is possible. The point is made in the article that simply showing that it is true for a large number of candidates is NOT a proof, as you will, by definition, never make it to infinity.
The trick is to use an abstract and generalised proof, for example:
by contradiction: you say that the conjecture is untrue, then extrapolate some fact from this which is patently untrue. Hence the initial conjecture must be true.
by induction: you show that for some instance n the conjecture is true. You then show that for the general step n+1 the conjecture must also be true through the use of some logical argument, rather than just testing it. Hence the conjecture must be true for all instances.
abstraction: find some analogous system and proove it for that. For example, when doing analysis of AC curcuits the common technique is to consider the current and voltage as phasors (ie. V*e^i*theta)and manipulate the phasors which is much simpler. When the manipulation is complete you can simply take the real/imaginary part of the result, and you have your answer. This makes use of the identity that e^i*theta = cos theta +i*sin theta. (I shall leave the proof as an excercise for the student [grin])
ahh. say constant accelleration, quarter mile track, blah blah blah. comes out at about 170 kW. at about 510A. sounds feasible. range can't be great though. say the batteries are rated at 40 Ah, then you've got about 5 mins. nicely practical then.
I'm not entirely convinced about the accuracy that they can get.
let's say that you are 5 km from a base station of a particular cell. It would take 1.66 *10^-5 seconds for the signal to travel that distance. At a data rate of 9600 baud (which I seem to remember is what GSM can do) this is ~ 16% of the transmit time for a single bit. I woulndn't think that correction would be neccessary for lightspeed errors in TDMA.
second, you would need very accurate timing equipment to get an accurate fix, and that would cost a lot of money which the companies don't really need to spend (unless you happen to be of a paranoid persuasion, and suspect govt involvement).
third, a more elegant solution would be to build in a gap between transmissions from each handset on the channel. This gap would be determined by the maximum lag possible within that cell. This would not affect call quality noticeably, and would save on the timing gear.
fourth, I don't know how accurately it is possible to get a directional fix on a cell phone from a single tower. Again, there is no need for the telco to engineer the ability to get a directional fix on the phone, so why spend the money.
lastly, the base transmitter polls all the phones in the cell every now and again, depending on traffic levels, to keep the master record of what phone is in what cell up to date. This is analogous to "initiating a trace", as you called it.
exactly. If you're looking at signal strength as well as direction, you wouldn't need two antennae. You would simply use the direction of the signal combined with the distance given by whatever function you have for signal strength vs distance. This is probably of the type 1/x^2, with some correction for atmospheric conditions etc.
have a look here for details of what they've been doing in my department.
it's weird: the two guys in the photo must be the only researchers in the place without beards. Maybe they made them shave to be more photogenic for the popular press.
ferroelectric Liquid Crystals have properties that enable them to be used a optical switches. here is what Colorado are doing. My supervisor reckons that they are going to be very big. And cool.
for a start look at that apalling film "hackers" from the mid-ninties. And that ripped off the images from legions of dodgy 80s and 90s films and TV shows.
you said: . I think any serious computer user should learn at least some basics of computer architecture
yet the article contains the sentence: For optimizing some parts they even developed their own "edge triggered flip-flop" (a low-level component that "catches" a bit of information), and so on.
The J-K bistable (also known as a flip-flop) is the basis of sequential logic. It is the fundamental building block of CPUs. And they are all essentially triggered by the edge on the clock cycle. Consequently I suspect that the author might want to follow your advice as he makes the development sound quite grandiuse, when in fact they have been around for longer than my lifetime.
He could, of course, just be providing a pretty poor explanation of what a flip-flop is.
and no "it's like a sandal" gags please.
Re:Your few remaining rights have been annihilated
on
etoy.com Returns
·
· Score: 1
furthermore, the name was produced by a random word generator. Or so I read somewhere, possibly their site.
Thought is only a flash between two long nights, but this flash is everything. Henri Poincaré
I really hope this is not serious, but if it is then I strongly urge you not to do it. As Poincaré says, the moments are everything, and the nights fade into nothingness in those fleeting moments of clarity or emotion. Don't rely on the doctors, rely on yourself and let the docs help if you need them to. There are always options, and the best one is usually to just go and attack the problems head on.
do you really think that had anything to do with the court case and not the problems they haev had with order fulfillment (here on FT.com).
clearly in this sector delivery times are critical, and matter to their customer base much more than a bit of corporate bulldozing. Remember, your average net consumer doesn't care about (until recently) obscure European conceptual artists. They care about getting little Jonny's toy on time, and eToys were below industry standard here.
I think that the result is fantastic, and was registered on toywar a while back, but I, and the average slashdotter, are not the same as the standard net user. The stock fall had very little to do with the domain dispute.
fine decks, but God should also consider the new Vestax PDX - D3S turntables, which many of the top dj's are moving over to. I hear that home in London and various other clubs are installing them as an alternative to the staple 1200s because the djs are requesting them (for example Carl Cox)
The IBM engineers are really ENGINEERS. They are thinking about solutions and how to address the problem *using* the boundaries that nature has given us rather than attempting to find ways around them.
also I didn't realise that K.E.D. did physics as well as write books. you'd get a moderation if I hadn't already posted to this story.
which is why IBM spends a huge amount of money on student placements and sponsorship etc (though non of it seems to go to the wages of the student employees - shame)
do you not think that the difference in the number of users of dope in jamaica and the states and europe depends more on the fact that there is a culture of cannabis usage there.
For example, when I was in Thailand recently the penalties for drug usage are extremely stiff, but the culture is widespread. In the south on the islands there is a lot of dope and amphetamines. In the north opium is prevalent and has been smoked for thousands of years. it's more the fact that there is historical context that means that alot of ppl use drugs.
As to Al Capone, He didn't want the status quo to change because his entire business depended on the prohibition. It was nothing to do with the number of people drinking, which clearly went up after the end of prohibition. This is in direct contracdiction to your assertion that legalisation/decriminalisation of drugs will reduce the number of users.
The way to win the drugs war is to realise that it is not a war. why shouldn't people get high on assorted chemicals if they want to as long as they don't harm others and pay for the harm they cause themselves? Education is what's needed.
Lastly, if drugs were legalised, usage would not go down as you suggest. The main thing that stopped me from smoking more dope in the last few years is the law. Now I don't use cannabis as I have noticed an associated memory loss, though this is annecdotal evidence. I don't use pills any more as I can't legally check what I am getting, so could really fsuck myself up. Usage in holland is high, but the number of addicts and madical casualties of hard drugs is low. Also AIDS spread through dirty needles is very low as needle exchanges are supported. All in all their approach is to treat drug users as patients rather than the enemy.
Did you hear about the K foundation prize a few years ago?
They offered a prize of £40000 for the worst piece of modern art produced in the previous year. Now here comes the good bit: The shortlist was announced coincidentally on the same day as the Turner prize for modern art. Even more coincidentally, the same people were on each list. To top it all, when the K foundation prize was announced, it was the person who had won the Turner a few minutes before. Who'd have guessed?
The final detail that made it all worthwhile was that the Turner is only worth £20000.
Slashdot Mirror
just a note, in case anyone is wondering what I am talking about when www.ebay.com is shown to be running IIS by netcraft. They run IIS/NT for the pretty Frontpage stuff, but have a look at the guts of the site: search.ebay.com . That's running Zeus 3.3.
Dear STEPHEN J. MacCARTHY,
In your ridiculously titled role of executive director for university relations at Penn State University, would you deign to allow me to post a link on the Slashdot.org news forum to PSU's homepage at http://www.psu.edu. Pkease note that my posting on the forum will only be available to the world for a few weeks, and only within easy access for the next day or so. Also please be aware that I am not the owner or operator of the site "slashdot.org", and the your link would meerly appear as a comment in the open forums. As such it is owned by me, though given my inclinations to free speech, I would grant everyone free, accredited, rights to reproduce it.
yours etc.
onwards!
The trick is to use an abstract and generalised proof, for example:
by contradiction: you say that the conjecture is untrue, then extrapolate some fact from this which is patently untrue. Hence the initial conjecture must be true.
by induction: you show that for some instance n the conjecture is true. You then show that for the general step n+1 the conjecture must also be true through the use of some logical argument, rather than just testing it. Hence the conjecture must be true for all instances.
abstraction: find some analogous system and proove it for that. For example, when doing analysis of AC curcuits the common technique is to consider the current and voltage as phasors (ie. V*e^i*theta)and manipulate the phasors which is much simpler. When the manipulation is complete you can simply take the real/imaginary part of the result, and you have your answer. This makes use of the identity that e^i*theta = cos theta +i*sin theta. (I shall leave the proof as an excercise for the student [grin])
ahh. say constant accelleration, quarter mile track, blah blah blah. comes out at about 170 kW. at about 510A. sounds feasible. range can't be great though. say the batteries are rated at 40 Ah, then you've got about 5 mins. nicely practical then.
let's say that you are 5 km from a base station of a particular cell. It would take 1.66 *10^-5 seconds for the signal to travel that distance. At a data rate of 9600 baud (which I seem to remember is what GSM can do) this is ~ 16% of the transmit time for a single bit. I woulndn't think that correction would be neccessary for lightspeed errors in TDMA.
second, you would need very accurate timing equipment to get an accurate fix, and that would cost a lot of money which the companies don't really need to spend (unless you happen to be of a paranoid persuasion, and suspect govt involvement).
third, a more elegant solution would be to build in a gap between transmissions from each handset on the channel. This gap would be determined by the maximum lag possible within that cell. This would not affect call quality noticeably, and would save on the timing gear.
fourth, I don't know how accurately it is possible to get a directional fix on a cell phone from a single tower. Again, there is no need for the telco to engineer the ability to get a directional fix on the phone, so why spend the money.
lastly, the base transmitter polls all the phones in the cell every now and again, depending on traffic levels, to keep the master record of what phone is in what cell up to date. This is analogous to "initiating a trace", as you called it.
it's weird: the two guys in the photo must be the only researchers in the place without beards. Maybe they made them shave to be more photogenic for the popular press.
biggus dickus?
for a start look at that apalling film "hackers" from the mid-ninties. And that ripped off the images from legions of dodgy 80s and 90s films and TV shows.
. I think any serious computer user should learn at least some basics of computer architecture
yet the article contains the sentence:
For optimizing some parts they even developed their own "edge triggered flip-flop" (a low-level component that "catches" a bit of information), and so on.
The J-K bistable (also known as a flip-flop) is the basis of sequential logic. It is the fundamental building block of CPUs. And they are all essentially triggered by the edge on the clock cycle. Consequently I suspect that the author might want to follow your advice as he makes the development sound quite grandiuse, when in fact they have been around for longer than my lifetime.
He could, of course, just be providing a pretty poor explanation of what a flip-flop is.
and no "it's like a sandal" gags please.
Henri Poincaré
I really hope this is not serious, but if it is then I strongly urge you not to do it. As Poincaré says, the moments are everything, and the nights fade into nothingness in those fleeting moments of clarity or emotion. Don't rely on the doctors, rely on yourself and let the docs help if you need them to. There are always options, and the best one is usually to just go and attack the problems head on.
good luck
clearly in this sector delivery times are critical, and matter to their customer base much more than a bit of corporate bulldozing. Remember, your average net consumer doesn't care about (until recently) obscure European conceptual artists. They care about getting little Jonny's toy on time, and eToys were below industry standard here.
I think that the result is fantastic, and was registered on toywar a while back, but I, and the average slashdotter, are not the same as the standard net user. The stock fall had very little to do with the domain dispute.
and nothing to do with AMD apart from the fact that all chip companies are making faster chips.
btw presumably you are at Umist/manchester. Top place.
all he did was make the technology and engineers they always had the focus
The IBM engineers are really ENGINEERS. They are thinking about solutions and how to address the problem *using* the boundaries that nature has given us rather than attempting to find ways around them.
also I didn't realise that K.E.D. did physics as well as write books. you'd get a moderation if I hadn't already posted to this story.
ex-employee btw
For example, when I was in Thailand recently the penalties for drug usage are extremely stiff, but the culture is widespread. In the south on the islands there is a lot of dope and amphetamines. In the north opium is prevalent and has been smoked for thousands of years. it's more the fact that there is historical context that means that alot of ppl use drugs.
As to Al Capone, He didn't want the status quo to change because his entire business depended on the prohibition. It was nothing to do with the number of people drinking, which clearly went up after the end of prohibition. This is in direct contracdiction to your assertion that legalisation/decriminalisation of drugs will reduce the number of users.
The way to win the drugs war is to realise that it is not a war. why shouldn't people get high on assorted chemicals if they want to as long as they don't harm others and pay for the harm they cause themselves? Education is what's needed.
Lastly, if drugs were legalised, usage would not go down as you suggest. The main thing that stopped me from smoking more dope in the last few years is the law. Now I don't use cannabis as I have noticed an associated memory loss, though this is annecdotal evidence. I don't use pills any more as I can't legally check what I am getting, so could really fsuck myself up. Usage in holland is high, but the number of addicts and madical casualties of hard drugs is low. Also AIDS spread through dirty needles is very low as needle exchanges are supported. All in all their approach is to treat drug users as patients rather than the enemy.
They offered a prize of £40000 for the worst piece of modern art produced in the previous year. Now here comes the good bit:
The shortlist was announced coincidentally on the same day as the Turner prize for modern art. Even more coincidentally, the same people were on each list. To top it all, when the K foundation prize was announced, it was the person who had won the Turner a few minutes before. Who'd have guessed?
The final detail that made it all worthwhile was that the Turner is only worth £20000.