The trouble with per-user filtering
on
DSPAM v2.10 Released
·
· Score: 3, Insightful
Spam filtering needs to be applied to multiple E-mail accounts to work really well. The fundamental characteristic of spam that can't be avoided is that large numbers of similar messages are sent to different people. That's recognizable.
Looking for spam by content analysis for a single user only works for some people. If, for example, your legitimate E-mail contains many messages about investments, mortgages, and similar financial subjects, it's going to be hard to separate out financial spam by word analysis.
Spamcop does multiple-user analysis. It works better than most of the single-user systems.
Agreed. That was a big problem for us. Everyone on our team had a higher priority, like a day job or school or family.
I'm impressed with Red Whittaker's ability to motivate people.
He doesn't let them sleep much, let alone have a life outside of work.
The New York Times has a picture of Sandstorm hitting the fence. That shouldn't have damaged a HUMMV too much; those vehicles have full skid plate protection and no running gear projecting underneath. But plowing through a fence is grounds for elimination.
My suspicion is that their sensor suite was ill-chosen. They had four line scanners, three fixed and one steerable. The fixed ones were aimed to the left, the right, and slightly upward. The steerable one was presumably aimed as far forward as it can get good data.
This sounds good, but it's not that effective a system. All of them were single-line scanners. So the vehicle has to assemble ground profiles from successive line scans. The hard-mounted units weren't stabilized, so they wouldn't produce good profiles beyond slow speeds. The long-range gimballed Reigl scanner was stabilized in three axes, but it's still a line scanner. It only gets one chance to see any point on the ground, and it sees it at maximum range and at the most oblique angle possible, the worst possible condition. Any problems, and you have to slow down and try to use the gimbal to pick up the missing data. Or you can just go plowing ahead, which is apparently what they did.
I think this establishes that line scanners aren't going to solve this problem. CMU had the fanciest single-line scanner ever built, and they crashed into a very clear obstacle. CMU was more successful in the 1980s with a 3D laser rangefinder on the Navlab project. That unit was too slow for this event, but was the right idea.
We'd been through this analysis a year ago on Team Overbot, and knew we needed something better. We know what's needed, but couldn't get it built in time.
Our custom laser rangefinder vendor went out of business, and the alternative vendor couldn't deliver in time. Next time.
CMU's race log is silent about this. Their last entry ends "We can win this. Spare nothing. Victory or demise."
It beats that "dead" feeling you get when you lose" - Buffy
Both CMU and Caltech seem to have failed on Power Line Road near Camp Rock Road, That's a rather boring piece of terrain, and seemingly easier than the first two miles. Again, what went wrong?
Details are still scant. I've read two completely different explainations of what went wrong with CMU's vehicle. The Associated Press reports that went off course, hit a rock, and broke an axle. Other reports claim a "blown engine".
Team DAD's vehicle was held in DARPA-controlled pause for two hours, a mile behind CMU's failed vehicle. After the long pause, it was disabled. What's the story there?
The Golem Group vehicle was just disabled. That's the last one. It's over. SciAutonetics II and Red Team made it to 7 miles. Team DAD made it to mile 6. The Golem Group is listed with 5 miles, but the map never showed them much past the starting line. Nobody else got very far.
Well, maybe. The text tracking page says 5 miles, but the graphical tracking page shows it near the start, not in the cluster around miles 6-7. Anybody know?
They're the only ones who still have a chance, and DARPA has them paused, stuck behind the failed CMU and Caltech entries. Team DAD is basically one guy in Morgan Hill, CA, and if he's in the lead, it makes those big expensive projects that involve Government contractors look bad.
Everybody else is either disabled or can't get past mile 1, but team DAD has been paused at mile 6, stuck behind the disabled CMU and Caltech vehicles, for hours now. They're getting a raw deal.
They've been paused by DARPA at mile 6 for an hour, presumably because of the CMU roadblock at mile 7. What's holding things up? Any word from the webcast?
They were disabled before moving off mile zero. Anybody know what happened?
I had real hopes for that high school group.
No vehicle has advanced for an hour now. Caltech is supposedly "running", but they've been at mile 1 for an hour. Team DAD is at mile 6, but paused. Are they being held up behind the bottleneck at mile 7, or what?
Are there any pictures of what's happening at mile 7? The tracking system shows Wrecker 1 moving to that location.
No new vehicle has started for some time now. Teams were supposed to start at 5-minute intervals, but only seven teams have started and we're 90 minutes into the race. Is there a jamup near the start, too?
Red Team and SciAutonics II are dead at mile 7.
Virginia Tech and Axion Racing are dead at the starting line. Team DAD is in the lead at mile 6.
Team Caltech has been hung up at mile 1 for half an hour now.
This thing looks like a photo of a plastic model composited with another scene. Can anybody identify the transformer toy?
It's not even a good design.
Notice that locations which need big actuators, like hip joints, show no sign of them.
It's quite possible to build a legged robot out of auto parts. Mark Pauline of SRL built a 12-foot high walking quadruped in the 1980s. I've seen it work, and have visited his shop. Nice piece of work. The control system was all time-delay relays and R/C gear. No computers.
How to get rid of spam by legal means
on
Spam Bits
·
· Score: 2, Insightful
It can be done. Just follow the money. Make banks that issue merchant accounts financially responsible for the spam of their merchants. After all, they're profiting from it. Visa and MasterCard together have the power to stop spam dead.
Going offshore won't help, if the banking system is forced to cooperate. The credit card system can collect chargebacks from faraway merchants without much trouble.
This won't create strong materials. He's not splicing carbon nanotubes together end to end, which has a chance of preserving the strength. He's just taking short nanotubes, basically lint, and twisting them together. That's orders of magnitude weaker, and far easier.
Slashdot Mirror
Looking for spam by content analysis for a single user only works for some people. If, for example, your legitimate E-mail contains many messages about investments, mortgages, and similar financial subjects, it's going to be hard to separate out financial spam by word analysis.
Spamcop does multiple-user analysis. It works better than most of the single-user systems.
John Nagle
Team Overbot
My suspicion is that their sensor suite was ill-chosen. They had four line scanners, three fixed and one steerable. The fixed ones were aimed to the left, the right, and slightly upward. The steerable one was presumably aimed as far forward as it can get good data.
This sounds good, but it's not that effective a system. All of them were single-line scanners. So the vehicle has to assemble ground profiles from successive line scans. The hard-mounted units weren't stabilized, so they wouldn't produce good profiles beyond slow speeds. The long-range gimballed Reigl scanner was stabilized in three axes, but it's still a line scanner. It only gets one chance to see any point on the ground, and it sees it at maximum range and at the most oblique angle possible, the worst possible condition. Any problems, and you have to slow down and try to use the gimbal to pick up the missing data. Or you can just go plowing ahead, which is apparently what they did.
I think this establishes that line scanners aren't going to solve this problem. CMU had the fanciest single-line scanner ever built, and they crashed into a very clear obstacle. CMU was more successful in the 1980s with a 3D laser rangefinder on the Navlab project. That unit was too slow for this event, but was the right idea.
We'd been through this analysis a year ago on Team Overbot, and knew we needed something better. We know what's needed, but couldn't get it built in time. Our custom laser rangefinder vendor went out of business, and the alternative vendor couldn't deliver in time. Next time.
CMU's race log is silent about this. Their last entry ends "We can win this. Spare nothing. Victory or demise."
It beats that "dead" feeling you get when you lose" - Buffy
Both CMU and Caltech seem to have failed on Power Line Road near Camp Rock Road, That's a rather boring piece of terrain, and seemingly easier than the first two miles. Again, what went wrong?
Team DAD's vehicle was held in DARPA-controlled pause for two hours, a mile behind CMU's failed vehicle. After the long pause, it was disabled. What's the story there?
From the wires of the Associated Press:
The Golem Group vehicle was just disabled. That's the last one. It's over. SciAutonetics II and Red Team made it to 7 miles. Team DAD made it to mile 6. The Golem Group is listed with 5 miles, but the map never showed them much past the starting line. Nobody else got very far.
And they're not getting anywhere.
And they're not getting anywhere. It's almost over.
Well, maybe. The text tracking page says 5 miles, but the graphical tracking page shows it near the start, not in the cluster around miles 6-7. Anybody know?
The Golem Group vehicle has reached mile 4. It looks like it's going about 3-4 MPH, and has passed SciAutonics I and the OSU monster truck.
They're the only ones who still have a chance, and DARPA has them paused, stuck behind the failed CMU and Caltech entries. Team DAD is basically one guy in Morgan Hill, CA, and if he's in the lead, it makes those big expensive projects that involve Government contractors look bad.
Everybody else is either disabled or can't get past mile 1, but team DAD has been paused at mile 6, stuck behind the disabled CMU and Caltech vehicles, for hours now. They're getting a raw deal.
They've been paused by DARPA at mile 6 for an hour, presumably because of the CMU roadblock at mile 7. What's holding things up? Any word from the webcast?
Next to start is the Ohio State monster truck. At the QID, it hit obstacles twice, so this should be entertaining.
How much damage? (They're borrowing our laser rangefinder. It's the one on top.)
No vehicle has advanced for an hour now. Caltech is supposedly "running", but they've been at mile 1 for an hour. Team DAD is at mile 6, but paused. Are they being held up behind the bottleneck at mile 7, or what?
Now they're back to mile 7 and still disabled, so apparently they're dead.
SciAutonics II is listed as "disabled", but it has advanced from 7 to 10 miles and shows green on the tracking diagram. Are they in or out?
Zero miles travelled. Team DAD is in the lead.
No new vehicle has started for some time now. Teams were supposed to start at 5-minute intervals, but only seven teams have started and we're 90 minutes into the race. Is there a jamup near the start, too?
Red Team and SciAutonics II are dead at mile 7. Virginia Tech and Axion Racing are dead at the starting line. Team DAD is in the lead at mile 6. Team Caltech has been hung up at mile 1 for half an hour now.
It's not even a good design. Notice that locations which need big actuators, like hip joints, show no sign of them.
It's quite possible to build a legged robot out of auto parts. Mark Pauline of SRL built a 12-foot high walking quadruped in the 1980s. I've seen it work, and have visited his shop. Nice piece of work. The control system was all time-delay relays and R/C gear. No computers.
Going offshore won't help, if the banking system is forced to cooperate. The credit card system can collect chargebacks from faraway merchants without much trouble.
This won't create strong materials. He's not splicing carbon nanotubes together end to end, which has a chance of preserving the strength. He's just taking short nanotubes, basically lint, and twisting them together. That's orders of magnitude weaker, and far easier.