Want to read Slashdot from your mobile device? Point it at m.slashdot.org and keep reading!


Forgot your password?
Check out the new SourceForge HTML5 internet speed test! No Flash necessary and runs on all devices. ×

Comment Re:Walmart also uses direct solar (Score 1) 57

Sorry for posting anon, but having difficulties logging in right now. Also, full disclosure, I'm a property technician for Target.

There's also a big difference in how Target and Walmart design their stores. There are a few stores Target has that uses direct lighting in, one in the greater metro Detroit area. For the most part though it isn't as feasible with how they have their drop ceilings set up. Walmart uses a more industrial design with a high, exposed girder system and full runs of florescents across the entire building. Target on the other hand uses a drop ceiling with an average height of 14ft and a floor with a high gloss finish to maximize the uses of it's grid pattern lighting solutions. Any type of direct lighting would be difficult to add into the brand image Target has for it's stores.

Thanks for the info, I've noticed the difference in style but didn't give it much thought. Still, it would be nice for them to figure out a way to get the best of both worlds.

Comment Re:Walmart also uses direct solar (Score 1) 57

This. Commercial PV panels are about 18% efficient at converting solar energy into electricity, and the best fluorescent bulbs are about 15% efficient at converting electricity into light (the rest becomes heat). So if you install PV panels to power your lights, you're only converting about 2.7% of the sunlight hitting your solar panels into interior light.

Fluorescent lights are around 80% efficient (similar to LEDs). Incandescent lights (traditional light bulbs) are around 15% efficient. It's why you can replace a 60W light bulb with a 13W CFL.

Uh, no. An incandescent bulb is 3-4% efficient, 5% efficient at best (that is 5% of the energy is emitted as visible light, 95% is emitted as heat). Fluorescent bulbs and LEDs are far more efficient, but nowhere near even 50%. Fluorescent bulbs are around 4x as efficient, LEDs around 6x.

Using direct lighting instead of PV + electric light is a huge win, and leaves the rest of the roof open for PV installation if you want.

To give an idea of how much lighting is used, I counted the lights in a Hobby Lobby last time I was there (what else would a guy do in there?) and they had about 3000 40W fluorescent lamps. That's 120KW just for lighting (most of which turns into heat that the A/C has to pump out, by the way) which works out to about $12/hour here in TN. Walmarts don't light as brightly as a Hobby Lobby, but they have larger stores. The energy savings from the skylights is really big.

Comment Re:I don't agree that these are "conservative" vie (Score 1) 121

Enforcing immigration law is not inherently xenophobic. Deporting all illegals and building a wall to hinder their return sound perfectly reasonable to me.

My wife is from the Philippines, and most Filipinos that I know are actually kind of pissed about the "illegals". When you come here legally, it costs a bunch of money, if you have a work permit it has to be renewed in person annually, and going through the process of getting a green card or citizenship is also expensive. And you get harassed if you don't do everything correctly. You (the American citizens) would be embarrassed if you knew how some folks are treated when they simply want to come here legally.

So, yeah, there's a little resentment when people come here without that sort of pain.

At the same time, we have friends who are illegals and we personally know that most go through other kinds of pain - like walking 1000 miles through the desert - to get here.

Comment Re:Snake oil salesman (Score 1) 49

Ha ha. That's a common joke about the security industry. There is some truth to it.

What's great with bug bounty programs is that customers pay for results. You pay for valid and useful vulnerability reports. You don't pay for reports that are not useful. For hackers to make money (and the best ones make a lot of money), they must produce useful and relevant vulnerability reports.

That's a HUGE difference compared to traditional security products and services and it explains why bug bounty programs are becoming so popular. They are much more effective than any other method of finding vulns in live software.

Comment Re:70,000 white hat hackers? (Score 1) 49

Yep, 70,000 is a lot! The number keeps growing, and we hope to get to a million. To serve all companies and government organizations worldwide who will be needing bug bounty programs, we need a lot of excellent hackers.

It should also be noted that it takes a lot of hacking to find even a simple vulnerability. Of the 70,000 hacker accounts we have, about 1 in 6 have filed an actual vulnerability report. To help them get going, we have an ebook on hacking that we give to new hackers. Once new hackers get the hang of bug hunting they can advance fast, earning more and more reputation points. When you sign up at HackerOne, you start at 100 points. Our most prolific hackers have reached 10,000 points. You can do it, too!

Comment The issue isn't (just) speed - it's (also) range. (Score 1) 43

LTE is already pretty darn fast, so losing a little performance isn't going to make that big of a deal. It's not as if you can torrent to your hearts content without killing your cell phone bill.

The issue isn't just speed. It's also range.

At any given speed, the Qualcom can support it at substantially lower signal levels. 6ish dB in a lot of cases, a bit less in some, enormously more in others.

Look at the graphs in TFA. In addition to some specific pathologies that penalize the Intel chip farther, the bulk of the graph has the drop off looking similar but with the Qualcom shfited 5 or 6 dB to the right. (Those squares are 5 dB wide.)

6 dB is four times the effective signal strength, which corresponds to twice the range. That maps into four times the area served at that speed from a single cell tower (important in sparsely-served areas), deeper penetration into buildings and the like (in more heavily-covered areas). It can also map into more data pushed before a given area and channel allocation's bandwidth is saturated. 3 dB corresponds to twice the effective signal strength, 1.4ish times the radius, twice the area served.

If the modems were equivalent and the problem just the layout of the board and antenna, you'd expect the two curves to be the same shape but just offset. The shape is substantially different, so (board issues or not) something else is going on.

Comment Re:Second coming of teams of ethical hackers (Score 1) 49

Yep this is true. It is also a common situation that humanity has dealt with successfully many times. To keep a ship afloat, you must find and fix every hole. Even one hole might sink it. To keep an aircraft safely flying, similarly every safety aspect must be in shape. Shipping and airlines have great safety track record these days.

To keep software secure, you must attempt to fix all serious vulnerabilities. You may never get to 100% vuln-free software, but the closer you get and the faster you can asymptotically move towards that goal, the more you reduce your cybersecurity risk.

Comment Firefox has uBlock Origin (Score 2) 87

If you just want to block ads to your browser, then Firefox has the best tool. uBlock Origin can be configured for adblock, malware, and many sundry lists. Opera also advertises adblock as well as VPN, but Opera is now Chinese-owned and will be able to keybridge you, so caveat emptor.

You only need to touch /etc/hosts if you want to adblock Chrome and/or something OTHER than a browser. In that case, I am using AdAway from F-Droid, and that needs root every time it applies updates to /etc/hosts, so you will likely need persistent root.

Comment Re:There is something to that... (Score 1) 399

but at least they got their audience right, idiots that cant figure out the slightest thing, and they pay the premium for it too!

Or smart people like me who realize that they have better things to do than fuck around with cleaning up viruses...

Comment Re:Were the users randomized? (Score 1) 399

I mean, I'm sure our Linux users overall require the least tech support. But that's a function of who they are more than what they're using.

I don't doubt that Macs require less support, but 40% vs 5% says that something else is going on - and I doubt that sort of ratio will hold once people are converted in bulk.

I see you don't have a computer-using parent. I put my foot down about 10 years ago and told the parents that one of two things was going to happen:

1. The get a Mac
2. They quit bugging me about computer issues

There was no third option. They chose #1. The ratio of problems before and after is far larger than 8:1, probably more around 20:1. You think 8:1 seems like a large ratio - I'm wondering why IBM isn't seeing an even better average. My guess is it's because they already have a significant firewall/anti-virus setup to minimize that set of Windows headaches.

Comment Re:Second coming of teams of ethical hackers (Score 2) 49

It has taken decades for the industry to get used to bug bounties. The first one was in 1981. Now it is starting to be very real. HackerOne has already paid out over $10,000 to hackers and researchers around the world. One hacker has made over half a million dollars. Another recently bought an apartment for his mother with the bounty money he had made. Still lots of work and education to do, but it is very much moving in the right direction. An example: the US DoD now committing $7m to vulnerability disclosure programs.

- Marten (HackerOne CEO)

Comment Re:Is that all (Score 1) 498

It's inevitable that a certain fraction of people go off the deep edge. People are irrational, even (or perhaps mostly) people who are convinced they are entirely rational. Rationality is a fragile thing because emotion and confirmation bias are deeply woven into everyone's thinking.

For normal people are few more powerful emotional impulses than the urge to protect children. It should hardly be surprising that children come to harm from it.

Slashdot Top Deals

Unix is the worst operating system; except for all others. -- Berry Kercheval