Month: April 2009 (Page 1 of 13)

PCWorld – A study by Nielsen Online states that more than 60 percent of new Twitter users give up on the service a month after signing up. This doesn’t surprise me. The more I use Twitter, the more I realize it isn’t for everyone. Why? Because most people really don’t care what you’re doing. And you don’t care what they’re doing, either.

Twitter has gotten oodles of media attention lately, and I’m guessing that many users are signing up just to see what the ruckus is about. If Oprah and Ashton Kutcher use Twitter, it must be worth checking out, right? But once the newbies spend a few days telling the world what they’re doing in 140-character bursts — or reading mind-numbing “I’m-at-the-market” updates from friends and family — the novelty wears off in a hurry.

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PCWorld – Pure Digital’s Flip was a breakthrough product, but now it has company. We tested high-definition, YouTube-friendly pocket camcorders from Creative, Kodak, Sony, and Pure Digital and picked a champion. Here’s a guide to our roundup.

They may be tiny, but pocket camcorders are a gigantic force to be reckoned with, thanks to the rapid growth in popularity of Pure Digital’s Flip line of video cameras. Nearly 1 million Flip cams were sold in 2007, according to IDC Re­­search, and an NPD Research report named Pure Digital’s Flip Ultra the top-selling camcorder in the country last June.

Big-name companies are taking notice–Cisco ac­­quired Pure Digital for $590 million in stock in March, and major players are trotting out small, cell-phone-size pocket camcorders to chip away at the Flip’s throne, armed with the same dead-simple operation, easy sharing features, and cross-generational appeal as Pure Digital’s pioneering moviemaking device.
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These ultraportable camcorders make uploading and sharing videos very simple, usually with flip-out USB connectors and on-board software. Though the clips lose a lot of quality once uploaded to the Web, the pocket camcorders tested here are all high-definition models. That gives you greater flexibility with the source video–you can choose to view it on an HDTV or upload it to an HD-friendly Web service.

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PCWorld – Last week I offered anyone who might be interested a copy of the batch files and other tools (cURL, grep, my nasty little program and the Excel spreadsheet) for analyzing Twitter “Tweets” — all you had to do was send an e-mail to gearhead@gibbs.com with the subject “TA”. I’ve had quite a few requests and you will get the files in a few days — the delay is because I found a bug in my nasty little program and I haven’t had time to fix it.

While the Excel approach to analyzing Tweets was interesting, I admitted all along it was clumsy and ugly. So if you want to keep track of a current hot topic, say, a mildly interesting topic such as swine flu, how else might you do it?

You could search for exactly that term you’re looking for, but with Twitter Tweets there’s another way to look for relevant content using “hashtags.”
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Hashtags is a convention that uses a hash mark (#) to flag words in Tweets users want to be treated as description tags. Thus, the hashtag for swine flu could be “#swineflu” (spaces aren’t allowed so hashtags usually merge the words or separate them with dashes or underscores).

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technologyreview.com – Carpet cloaks make practical cloaking at visible wavelengths possible for the first time.

It wasn’t long ago that some physicists said that optical invisibility cloaks would be impossible to build. This week, two teams are claiming to have built cloaks that work over a wide range of optical wavelengths and the extraordinary thing is that both designs are almost identical (see illustrations in main article).

Invisibility cloaks work by steering light around an object fooling an observer who sees nothing but the background view. But while this works well for microwaves, it is not a straightforward matter to shrink these cloaks to a size that works at optical wavelengths.
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Now Michal Lipson and pals at Cornell University and Xiang Zhang and buddies at UC Berkeley say they have both built cloaks that are essentially mirrors with a tiny bump in which an object can hide. The cloaking occurs because the mirrors look entirely flat. The bump is hidden by a pattern of tiny silicon nanopillars on the mirror surface that steers reflected light in a way that makes any bump look flat. So anything can be hidden beneath the bump without an observer realising it is there, like hiding a small object under a thick carpet.

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technologyreview.com – Touch-screen technology has become wildly popular, thanks to smart phones designed for nimble fingers. But most touch screens have a major drawback: you need to keep a close eye on the screen as you tap, to make sure that you hit the right virtual buttons. As touch screens become more popular in other contexts, such as in-car navigation and entertainment systems, this lack of sensory feedback could become a dangerous distraction.

Now researchers at Carnegie Mellon University have developed buttons that pop out from a touch-screen surface. The design retains the dynamic display capabilities of a normal touch screen but can also produce tactile buttons for certain functions.

Graduate student Chris Harrison and computer-science professor Scott Hudson have built a handful of proof-of-concept displays with the morphing buttons. The screens are covered in semitransparent latex, which sits on top of an acrylic plate with shaped holes and an air chamber connected to a pump. When the pump is off, the screen is flat; when it’s switched on, the latex forms concave or convex features around the cutouts, depending on negative or positive pressure.
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To illuminate the screens and give them multitouch capabilities, the researchers use projectors, infrared light, and cameras positioned below the surface. The projectors cast images onto the screens while the cameras sense infrared light scattered by fingers at the surface.

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