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Current Topic: Technology

WiFi Interference « David Strom’s Web Informant
Topic: Technology 1:16 pm EDT, Oct 18, 2007

Here is a short note about our de-wiring the Croisette in Cannes.

For over a year, I had been operating a hotspot over one corner of the old port of Cannes. From there I was able to shoot down on the port, but not over the Palais with the legal 20dB signal. Actually, it was only really reliable for someone who had high gain on the connecting yacht…which there were only a few of at the time.

But I was able to get one high-profile CEO’s yacht connected during the Film Festival a few years ago, among others. And, they were able to grab the signal from across the bay in the newer Port Canto.

The next year the engineers for his new boat asked for more service, but couldn’t pick it up well. I came aboard and found out why. I attached a medium gain antenna to a Buffalo WiFi to Ethernet Converter and found nearly 100 signals available in the bay. Long story short, I eventually attached a yagi, pointed it at my site, found the cleanest channel and got them happy.

One of the channels that was broadcasting was a leftover from a previous project. A partner company bought rights from the city for several spots along the Croisette including the Mayor’s building, and a couple museums and hotels. We wired up the spots with antennas and repeaters from a reputable company, and got everything working using my site as the source. The big introduction was to be the GSM show. The day before everything checked out; you could walk anywhere on the Croisette and download with up to 3 Meg service (which we then clamped down so no one could take it all.)

That worked fine until about 10AM the day of the show. Then, while online downloading mail or a website with no problem, suddenly you would start getting errors and eventually, the connection would stall. Turns out that as every booth in the Palais lit up their private wifi site, as well as those set up in private sites in the hotels, solid connections became impossible. The hardware supplier couldn’t figure it out, whether it was the mesh taking the hit, or what it seemed to me; that there were just too many signals floating around in too little space. I’ve had the same thing happen in convention sites, where too many booth sites compete against the official supplier.

We rerouted the mesh to take signal from a different source, but it made no difference. In those days it wasn’t legal to put 802.11a into open air spaces, and as that was the manufacturers only solution after months of trying to work with the ‘g’ signal, we were forced to take down the system. I eventually closed my site over Cannes as well. Whether the manufacturer has found that ‘a’ solves all, I don’t know. I suspect that we are in for a lot of saturation problems when these city-wide sites get up.

WiFi Interference « David Strom’s Web Informant


OS X Crash Log: Apple Adds Memory Randomization To Leopard
Topic: Technology 10:43 am EDT, Oct 18, 2007

When I first started using Quark XPress 6.5 in Mac OS X here at my new job, it took a while to work out the kinks for a rather complex project (doing layout for a journal w/ a 24 hr. turn-around), to the point that I actually put up a ``crash log'' outside of my cubicle, so that people could gauge my mood before entering. It's been a year now, and while I've gotten the project in question worked out (had to train myself _never_ to undo re-sizing a text box &c.), the totals might be interesting to people:

2006:
Quark XPress: 207 crashes (as many as 9 per day)
Adobe Illustrator: 25
InDesign: 35
PhotoShop: 15
Acrobat: 65
Microsoft Word: 23
Macromedia FreeHand: 9
Mac OS X: 14 (this includes Mac OS X apps like Mail.app and Safari.app)

The totals for this year are a bit more reasonable --- Quark XPress v6.5: 26, v7: 46 (I had to move the afore-mentioned journal over to Quark 7 after a re-design and that involved a new set of things to work-around) --- but I find Mac OS X overall reliable and workable as an environment (thought not as nice, consistent and synergistic as NeXTstep).

William

A kind of funny crash log.

OS X Crash Log: Apple Adds Memory Randomization To Leopard


Entrepreneurship Central
Topic: Technology 2:04 pm EDT, Oct  8, 2007

Entrepreneurship Central
Welcome to our Entrepreneurship Central portal. This is a new experiment to better capture and share advice around the essence and process of innovation, entrepreneurship and company building. We expect to further complement this over time with additional insight and perspective from entrepreneurs, CEOs and other thought leaders.

Dunno if this is good or not, but its new.

Entrepreneurship Central


How to timeout if a call to an external program takes too long
Topic: Technology 4:57 am EDT, Oct  3, 2007

Can we see the non-working code that uses alarm? This is a textbook example of when to use alarm.

Here, the alarm is triggered, and then processing continues:

alarm 5;
$SIG{ALRM} = sub { print "alarm!\n" };
my $yawn = `sleep 10 ; echo "yawn"`;
print "yawn? $yawn\n";
__END__
alarm!
yawn? yawn

Sometimes when I execute programs from perl using system() they don't return and perl gets stuck. This fixes that.

How to timeout if a call to an external program takes too long


Donald Ratajczak’s Blog
Topic: Technology 12:10 am EDT, Oct  2, 2007

In the previous two decades, output per unit of input grew less than a percent per year. Since the mid 1990s, productivity gains have been more than 3 percent per year. Indeed, some of the strongest productivity gains occurred early in the decade, when many production processes did not have sufficient quantities demanded to run at optimum rates.

One explanation for this surge is simple: we exported the use of hands. Then we exported the rote mind activity, even to the point of sending code writing, form filling, and simple diagnostic readings abroad. Even simple reporting (putting press releases into the available space) is likely to have a Bangalore byline. As an economist, I know that such exporting will continue until the earnings abroad are sufficient to overcome barriers to travel here (some constraints, such as transfer costs, must keep qualified people from traveling to the higher paying country). Brilliant politicians, if you erect immigration barriers, more jobs will be exported to overcome the inability to have the human capital migrate here.

Donald Ratajczak’s Blog


LibGD on OS X: The Nightmare
Topic: Technology 4:21 am EDT, Sep 27, 2007

The only package that will build worth a crap is gd-latest. Don't try any other, except 2.0.0. I hear that runs.

I just spent all night getting GD to build.

LibGD on OS X: The Nightmare


Mac OS X Ports: LibPNG LibJPEG
Topic: Technology 1:34 am EDT, Sep 27, 2007

Tekkotsu relies on libjpeg and libpng for image compression and decompression. Mac OS X does not ship with these libraries pre-installed, and so we provide binaries installers as a convenience for our OS X users, and by extension, everyone else.

These packages install universal binaries which will run natively on both PowerPC and Intel platforms.

Mac OS X Ports: LibPNG LibJPEG


INF - I'm not fool - QUE NO!!!: Generando PDF's usando Catalyst y PDF::CreateSimple
Topic: Technology 11:39 pm EDT, Sep 26, 2007

Easily output PDFs in your web app using Perl/Catalyst and Spanish.

INF - I'm not fool - QUE NO!!!: Generando PDF's usando Catalyst y PDF::CreateSimple


Catalyst The Elegant MVC Web Framework
Topic: Technology 10:47 pm EDT, Sep 26, 2007

Slides presenting Catalyst Framework

Catalyst The Elegant MVC Web Framework


Resampling Stats
Topic: Technology 10:36 am EDT, Sep 24, 2007

"Resampling: The New Statistics"

by Julian L. Simon
Second Edition published October 1997

This text grew out of chapters in the 1969 edition of Basic Research Methods in Social Science by the same author, and contains the first published example of what was later called the bootstrap. Simon is best known for his research in demography, population and the economics of natural resources, and gained fame when the noted biologist Paul Ehrlich selected five commodities and bet Simon that scarcity would drive their prices up over the period of the bet (in fact, their prices all dropped). Resampling: The New Statistics contains a number of examples in Resampling Stats, a computer program originated by Simon, but can be read on its own without the program.

Resampling Stats


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