You can aquire a used water fire extinguisher for about $50 or so (I got mine a few years ago for $40). For that, you get 2 1/2 gallons of water at 100 PSI. It's been awhile since I've used mine, but I know it'll at least match a super-soaker's 40', and the delivery rate is higher. Now, if only I could figure out a good way to turn it into a backpack...:>
One of my dad's theories on the dearth of jobs for older people is that companies are affraid that if they do hire an older person, they are exposing themselves to a risk of a lawsuit should they need to fire that person. I'm not sure if this is at work in the software industry (where 35 seems to mean you're a dinosaur), perhapse it's more true in other engineering professions, such as electrical (which is what both my dad and I are).
When did you send your modified client? I've been on staff for 1.5 years and havn't heard of such a client. If the client was actually open source at the time I'd guess you're talking several years ago. Who did you send the client to? Can you send me a copy?
I assume that you are reffering to distributed.net's effort in DES-III. At the time of that contest, we had about 40,000-50,000 'active participants' who had submitted blocks within the previous 30 days. Currently, we are working on RC5-64 and have about 67,000 participants who have submitted blocks in the past 30 days. Over the entire life of the RC5-64 contest, blocks have been submitted by 188,845 seperate email addresses, but as you can see, most of those emails are no longer active.
The article states that cell phones operate at close to the same frequency as microwave ovens, which I'm pretty sure isn't right. Microwaves operate at 10GHz, most cell phones are in the 400 or 800 MHz bands. This should make a dramatic difference in the effects on the human body.
Think of it as a problem of resonant frequency. You can subject a fine piece of glass to a very high sound pressure level as long as it's not close to it's resonant frequency. Get it close to resonance though, and it will tear itself apart.
The same is true with RF energy... it will excite molecules, but it will only have a large affect at or near the resonant frequency of the molecule. Because of this, a cell phone should affect a very different set of molecules than a microwave would (microwave ovens are tuned to the resonant frequency of water). This doesn't mean there won't be any overlap of course, but it becomes a question of how much power you're using.
As far as we can tell, the spammer did harvest the email addresses from our stats database. They seem to have targeted both the/. team as well as the OS/2 Warp team.
As mentioned in our official announcement below, we're going to try to make it as hard as possible for spammers to grab email addresses, but its to impossible to protect emails that are listed 'out in the open'. If you're concerned about spam, PLEASE edit your info so that you are not listed by your email address.
Again, we apologize to those of you who were targeted by this spammer. Its very disapointing that someone would use the services of a non-profit organization, who's goal is to make the computing world a better place, to send spam.
Here's our official announcement: Yesterday, a spammer 'harvested' email addresses from our stats database and sent out spam with spoofed email headers, making it appear that the spam came from slashdot.org or team warped. It appears that the spammer took email addresses out of the team member listing for the Slashdot team, the OS/2 Warp team, and perhaps other teams.
We are looking into ways we can make it harder for spammers to harvest email addresses from the stats database. Given the determination of some spammers, it will be difficult for us to completely protect email addresses without taking the stats off-line completely. Currently, our best line of defense is to allow participants to be listed by something other than their email address. If anyone has other suggestions, feel free to send them to our mailing list, rc5@lists.distributed.net.
If you are worried about your address being harvested, we strongly suggest that you edit your participant info and change how you are listed. In addition to being listed by your address, you can also be listed at 'Participant 123456' or by your name, which you can specify on the same page.
To edit your information, you need your password. If you don't have it, take a look at your personal stats listing at http://stats.distributed.net and click the link at the bottom of your listing that says 'I cannot remember my password. Please email...'
Once you have your password, go to http://stats.distributed.net/pedit.php3 You will be asked for a user name and a password. Your user name is your email address, and your password is the password that was mailed to you.
We hope that our users already assume this, but to clarify, distributed.net will never, ever sell or otherwise distribute your email addresses. The only method for people to retrieve email addresses is via the stats database. We do not support spam, and we're very sorry that someone would use our services to spam people.
The stats database updates daily from ~0:00-4:00 GMT. Until some blocks that you've checked make it to the stats server for an update, you won't see your email. To be safe, do a flush at about 23:00 GMT to make sure your blocks get included in that days stats run.
I don't know how serious you are about the sound quality, but you'll do even better with an optical link rather than a wired one. A wired link will still introduce noise into your DAC, though the better ones will do a good job of keeping that noise out of the analog.
Out of curiosity, what DAC do you plan on using? I've seen some mighty cheap ones in Stereophile as of late... I even recall one that was less that $100!:)
Re:damn. Thought the stats were better
on
Empeg Shipping
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· Score: 1
150G will probably do for most applications. Keep in mind that there's more to the shock rating than just hitting potholes, there is also a vibrational component.
To put these numbers in perspective, the engine computers I design must withstand a 20g vibrational spec and a 100g shock speck and operate from -40C to 85C.
Actually, this isn't entirely true. Generally speaking, there are no intentional differences in differet speed parts, it's simply a matter of how high a frequency they test good at. Note that this doesn't hold true 100% though... for instance, PIIs at 333 and below are designed for a FSB of 66MHz, and the 300s and below use a different technology than the 333s and above. So you'll have very different luck trying to overclock a 300, a 333, or a 400/450. Also note that mobo/chipset can make a difference... if either of them present a large capacitance then you'll have more difficulty attaining higher speeds.
Check out http://www.eet.com/story/OEG19990607S0035 It's mostly about using analog electronics to create very simple nervous systems. A Swedish satellite set to launch this August will use such a system for it's attitude control system.
I can tell you that the bulb used in the Museum of Science and Industry's OmniMAX theater in Chicago is some sort of an arc lamp. As I recall, it drew ~70 amps at ~30 volts, or 2.1kW. As a point of comparison, most conventional lights you see at a concert are 1kW, and most moving lights are in the 600W range. Movie shoots will sometimes use instruments in the 10-15kW range, and the largest I've ever heard of was 20kW.
If you've ever performed a traceroute between two sites using different NSPs in a major city, you've probably seen funny things like Chicago-LA-St.Louis-Chicago. But what if all of the multi-homed ISPs in an area could route traffic between their multiple NSPs and get paid (or at least not charged) for that traffic? Not only would it speed up the intra-city traffic, it would also help free up bandwidth on the NSPs backbones.
This would require some way for the NSP's customer routers to note if the traffic flowing to an ISP is destined for the ISP (or one of it's customers), or if it's going somewhere else (as in another NSP). The ISPs would probably also want some means to throttle or limit the thru-traffic, so that their customer's didn't end up suffering.
Becoming a moderator; lowering initial score
on
Slashdot Notes
·
· Score: 1
Is moderator status based solely on how much you read/. now? I would think it would be better to also consider how a user's posts have been moderated and how much they've posted. Also, it might be better to find some way to 'score' moderators based on their actions than rotating through them. *shrug*
As far as posts starting with 2 or 3, how about allowing those users the option to 'demote' their post at the start, if they feel they're posting something that's not all that important.
Keep in mind that anytime you create a subnet, you lose 2 IPs for the broadcast and network addresses. For example, in a/28 (16 IP addresses) this would work out to a broadcast address of $XX XX XX XF and a network address of $XX XX XX X0.
Your point is _very_ well taken for the larger subnets though. For example, the IP address of this machine is 155.1.x.x, but it's completely firewalled. As far as I know, our company's network would be just as happy if this box had a 10.x.x.x address. There's a lot of other companies in a similar boat. Unfortunatly, now that there's a perceived value to IP addresses, no one wants to give them up.
I too would be interested to know just how many IP addresses are currently un-assigned.
I'd also like to see some details on the OS (Aperios) it's running. I don't know if there's any OS's out there specifically designed for robotic applications. If Aperios was designed specifically for robotic/AI applications, it could end up being the basis for many other robotic applications.
As far as I know, they (we) are only getting rid of the 'discrete' components, such as OP-amps. Personally, I feel it's a bit of a shame... I know of several designers who specify only Motorola parts when available due to the very high quality. But, I guess if we can make more profit by doing something else with the capital, that's what should be done...
Jim C. Nasby Motorola AIEG (That's the automotive group, so don't bother asking me for a free cell-phone!:P)
My question is this... would the anti-virus software detect the exploit if it were coded differently? I'm sure that the details of this will soon make their way to many cracker sites. What happens then? Do we hope that Norton and the other anti-virus people can keep up?
Although it's not FreeBSD specific, I highly recommend the 'Unix System Administration Handbook' (http://www.amazon.com/exec/obidos/ASIN/0131510517 /distributednet - This link will help distributed.net out btw). Very good book, a must for any unix admin. (Read a slightly larger review at http://www.distributed.net/research/).
Currently, their biggest bottleneck is that all of their data is stored on magnetic tapes that aren't in a library (read as, you have to manually stick them into a tape drive). I'll try to find the URL when I get home.
I wouldn't even _think_ about attempting this, and I design engine computers. They are far, far, far more complicated that you might thing, especially newer ones which often control much more than simple combustion parameters.
First, you won't be able to do it with Linux, or any other standard PC unix. They simply aren't designed for this type of application. You'd have to go with some kind of RTOS (Real Time OS), and those generally cost big dollars.
Second, there is a huge amount of I/O on an ECU. There's between 1 and 8 injectors, 2-8 ignition coil outputs, air-flow sensor, throttle position, inlet air temp, crank position, cam position, knock sensor(s), and that's just to run the engine. Then there's all the other outputs that the ECU controls.
The environment is very harsh as well. During a load-dump, you will see 50V+ voltage spikes on Vbat. Temp. range for a ECU mounted on the passenger cabin side of the firewall is ~-40C - 100C. If it's mounted in the engine compartment, bump that to 125C. It needs to withstand 2+G of vibration as well.
If you're looking for tuning opportunites, there is probably an aftermarket chip of some kind for your truck. If nothing else, Eddlebrock and Holley are starting to make fuel injection systems.
Slashdot Mirror
You can aquire a used water fire extinguisher for about $50 or so (I got mine a few years ago for $40). For that, you get 2 1/2 gallons of water at 100 PSI. It's been awhile since I've used mine, but I know it'll at least match a super-soaker's 40', and the delivery rate is higher. Now, if only I could figure out a good way to turn it into a backpack... :>
One of my dad's theories on the dearth of jobs for older people is that companies are affraid that if they do hire an older person, they are exposing themselves to a risk of a lawsuit should they need to fire that person. I'm not sure if this is at work in the software industry (where 35 seems to mean you're a dinosaur), perhapse it's more true in other engineering professions, such as electrical (which is what both my dad and I are).
Thoughts?
When did you send your modified client? I've been on staff for 1.5 years and havn't heard of such a client. If the client was actually open source at the time I'd guess you're talking several years ago. Who did you send the client to? Can you send me a copy?
Thanks,
dB!
decibel@distributed.net
I assume that you are reffering to distributed.net's effort in DES-III. At the time of that contest, we had about 40,000-50,000 'active participants' who had submitted blocks within the previous 30 days. Currently, we are working on RC5-64 and have about 67,000 participants who have submitted blocks in the past 30 days. Over the entire life of the RC5-64 contest, blocks have been submitted by 188,845 seperate email addresses, but as you can see, most of those emails are no longer active.
Jim Nasby
distributed.net
The article states that cell phones operate at close to the same frequency as microwave ovens, which I'm pretty sure isn't right. Microwaves operate at 10GHz, most cell phones are in the 400 or 800 MHz bands. This should make a dramatic difference in the effects on the human body.
Think of it as a problem of resonant frequency. You can subject a fine piece of glass to a very high sound pressure level as long as it's not close to it's resonant frequency. Get it close to resonance though, and it will tear itself apart.
The same is true with RF energy... it will excite molecules, but it will only have a large affect at or near the resonant frequency of the molecule. Because of this, a cell phone should affect a very different set of molecules than a microwave would (microwave ovens are tuned to the resonant frequency of water). This doesn't mean there won't be any overlap of course, but it becomes a question of how much power you're using.
As far as we can tell, the spammer did harvest the email addresses from our stats database. They seem to have targeted both the /. team as well as the OS/2 Warp team.
As mentioned in our official announcement below, we're going to try to make it as hard as possible for spammers to grab email addresses, but its to impossible to protect emails that are listed 'out in the open'. If you're concerned about spam, PLEASE edit your info so that you are not listed by your email address.
Again, we apologize to those of you who were targeted by this spammer. Its very disapointing that someone would use the services of a non-profit organization, who's goal is to make the computing world a better place, to send spam.
Here's our official announcement:
Yesterday, a spammer 'harvested' email addresses from our stats database and sent out spam with spoofed email headers, making it appear that the spam came from slashdot.org or team warped. It appears that the spammer took email addresses out of the team member listing for the Slashdot team, the OS/2 Warp team, and perhaps other teams.
We are looking into ways we can make it harder for spammers to harvest email addresses from the stats database. Given the determination of some spammers, it will be difficult for us to completely protect email addresses without taking the stats off-line completely. Currently, our best line of defense is to allow participants to be listed by something other than their email address. If anyone has other suggestions, feel free to send them to our mailing list, rc5@lists.distributed.net.
If you are worried about your address being harvested, we strongly suggest that you edit your participant info and change how you are listed. In addition to being listed by your address, you can also be listed at 'Participant 123456' or by your name, which you can specify on the same page.
To edit your information, you need your password. If you don't have it, take a look at your personal stats listing at http://stats.distributed.net and click the link at the bottom of your listing that says 'I cannot remember my password. Please email...'
Once you have your password, go to http://stats.distributed.net/pedit.php3 You will be asked for a user name and a password. Your user name is your email address, and your password is the password that was mailed to you.
We hope that our users already assume this, but to clarify, distributed.net will never, ever sell or otherwise distribute your email addresses. The only method for people to retrieve email addresses is via the stats database. We do not support spam, and we're very sorry that someone would use our services to spam people.
Jim Nasby
distributed.net Human Interface
The stats database updates daily from ~0:00-4:00 GMT. Until some blocks that you've checked make it to the stats server for an update, you won't see your email. To be safe, do a flush at about 23:00 GMT to make sure your blocks get included in that days stats run.
Moo!
dB!
distributed.net Human Interface
I don't know how serious you are about the sound quality, but you'll do even better with an optical link rather than a wired one. A wired link will still introduce noise into your DAC, though the better ones will do a good job of keeping that noise out of the analog.
:)
Out of curiosity, what DAC do you plan on using? I've seen some mighty cheap ones in Stereophile as of late... I even recall one that was less that $100!
150G will probably do for most applications. Keep in mind that there's more to the shock rating than just hitting potholes, there is also a vibrational component.
To put these numbers in perspective, the engine computers I design must withstand a 20g vibrational spec and a 100g shock speck and operate from -40C to 85C.
Actually, this isn't entirely true. Generally speaking, there are no intentional differences in differet speed parts, it's simply a matter of how high a frequency they test good at. Note that this doesn't hold true 100% though... for instance, PIIs at 333 and below are designed for a FSB of 66MHz, and the 300s and below use a different technology than the 333s and above. So you'll have very different luck trying to overclock a 300, a 333, or a 400/450. Also note that mobo/chipset can make a difference... if either of them present a large capacitance then you'll have more difficulty attaining higher speeds.
Check out http://www.eet.com/story/OEG19990607S0035 It's mostly about using analog electronics to create very simple nervous systems. A Swedish satellite set to launch this August will use such a system for it's attitude control system.
Moo!
dB!
Is it just me, or are the choices pretty ugly? I would suggest they open it up for more entries. Just my opinion. :)
I can tell you that the bulb used in the Museum of Science and Industry's OmniMAX theater in Chicago is some sort of an arc lamp. As I recall, it drew ~70 amps at ~30 volts, or 2.1kW. As a point of comparison, most conventional lights you see at a concert are 1kW, and most moving lights are in the 600W range. Movie shoots will sometimes use instruments in the 10-15kW range, and the largest I've ever heard of was 20kW.
Jim Nasby, Freelance Lighting Designer
If you've ever performed a traceroute between two sites using different NSPs in a major city, you've probably seen funny things like Chicago-LA-St.Louis-Chicago. But what if all of the multi-homed ISPs in an area could route traffic between their multiple NSPs and get paid (or at least not charged) for that traffic? Not only would it speed up the intra-city traffic, it would also help free up bandwidth on the NSPs backbones.
This would require some way for the NSP's customer routers to note if the traffic flowing to an ISP is destined for the ISP (or one of it's customers), or if it's going somewhere else (as in another NSP). The ISPs would probably also want some means to throttle or limit the thru-traffic, so that their customer's didn't end up suffering.
Is moderator status based solely on how much you read /. now? I would think it would be better to also consider how a user's posts have been moderated and how much they've posted. Also, it might be better to find some way to 'score' moderators based on their actions than rotating through them. *shrug*
As far as posts starting with 2 or 3, how about allowing those users the option to 'demote' their post at the start, if they feel they're posting something that's not all that important.
Keep in mind that anytime you create a subnet, you lose 2 IPs for the broadcast and network addresses. For example, in a /28 (16 IP addresses) this would work out to a broadcast address of $XX XX XX XF and a network address of $XX XX XX X0.
Your point is _very_ well taken for the larger subnets though. For example, the IP address of this machine is 155.1.x.x, but it's completely firewalled. As far as I know, our company's network would be just as happy if this box had a 10.x.x.x address. There's a lot of other companies in a similar boat. Unfortunatly, now that there's a perceived value to IP addresses, no one wants to give them up.
I too would be interested to know just how many IP addresses are currently un-assigned.
I'd also like to see some details on the OS (Aperios) it's running. I don't know if there's any OS's out there specifically designed for robotic applications. If Aperios was designed specifically for robotic/AI applications, it could end up being the basis for many other robotic applications.
As far as I know, they (we) are only getting rid of the 'discrete' components, such as OP-amps. Personally, I feel it's a bit of a shame... I know of several designers who specify only Motorola parts when available due to the very high quality. But, I guess if we can make more profit by doing something else with the capital, that's what should be done...
:P)
Jim C. Nasby
Motorola AIEG (That's the automotive group, so don't bother asking me for a free cell-phone!
Hmmm... this could cause a new form of the /. effect.... we'll have to call it the TPM effect or something :)
My question is this... would the anti-virus software detect the exploit if it were coded differently? I'm sure that the details of this will soon make their way to many cracker sites. What happens then? Do we hope that Norton and the other anti-virus people can keep up?
Although it's not FreeBSD specific, I highly recommend the 'Unix System Administration Handbook' (http://www.amazon.com/exec/obidos/ASIN/0131510517 /distributednet - This link will help distributed.net out btw). Very good book, a must for any unix admin. (Read a slightly larger review at http://www.distributed.net/research/).
Moo!
dB!
http://www.distributed.net
Currently, their biggest bottleneck is that all of their data is stored on magnetic tapes that aren't in a library (read as, you have to manually stick them into a tape drive). I'll try to find the URL when I get home.
I wouldn't even _think_ about attempting this, and I design engine computers. They are far, far, far more complicated that you might thing, especially newer ones which often control much more than simple combustion parameters.
First, you won't be able to do it with Linux, or any other standard PC unix. They simply aren't designed for this type of application. You'd have to go with some kind of RTOS (Real Time OS), and those generally cost big dollars.
Second, there is a huge amount of I/O on an ECU. There's between 1 and 8 injectors, 2-8 ignition coil outputs, air-flow sensor, throttle position, inlet air temp, crank position, cam position, knock sensor(s), and that's just to run the engine. Then there's all the other outputs that the ECU controls.
The environment is very harsh as well. During a load-dump, you will see 50V+ voltage spikes on Vbat. Temp. range for a ECU mounted on the passenger cabin side of the firewall is ~-40C - 100C. If it's mounted in the engine compartment, bump that to 125C. It needs to withstand 2+G of vibration as well.
If you're looking for tuning opportunites, there is probably an aftermarket chip of some kind for your truck. If nothing else, Eddlebrock and Holley are starting to make fuel injection systems.
Hey, don't forget about FreeBSD either! :)