We noticed you're browsing in private or incognito mode.

To continue reading this article, please exit incognito mode or log in.

Not an Insider? Subscribe now for unlimited access to online articles.

Intelligent Machines

From the Labs: Information Technology

New publications, experiments and breakthroughs in information technology–and what they mean.

3-D Underwater Imaging
Technology inspired by fish could help undersea vehicles find their way

Artificial fish: Tiny sensors that imitate fish cells are arranged around a nine-centimeter PVC pipe.

Source: “Artificial lateral line with biomimetic neuromasts to emulate fish sensing”
Chang Liu, Douglas Jones, et al.
Bioinspiration & Biomimetics
5(1): 016001

This story is part of our May/June 2010 Issue
See the rest of the issue

Results: Drawing inspiration from sensory cells in fish, researchers at Northwestern University and the University of Illinois have created a new kind of underwater 3-D imaging device. The invention uses an array of sensors to detect objects–in this case, a crayfish–on the basis of their movements. It can pinpoint the location of objects within a distance equal to half the length of the array.

Why it matters: The automated underwater vehicles currently used for surveillance, research, surveying, and other applications navigate either with cameras, which don’t work well in murky water, or with sonar, which doesn’t work well at close range. This new sensor could allow for more accurate navigation, particularly in confined spaces and unclear water.

Methods: Fish detect obstacles, predators, and prey with the help of sensory organs made up of arrays of specialized cells. These cells use tiny hairlike projections to sense water movement. The researchers used microfabrication techniques to mimic these cells. Each artificial sensor consists of a vertical silicon “hair,” about 500 micrometers long, that is anchored to a piezoelectric device. As the hair moves, the piezoelectric material generates a voltage. The researchers developed an algorithm that interprets voltage signals from an array of the sensors to locate the source of moving water.

Next steps: The researchers will make larger sensor arrays and attach them to underwater vehicles for practical testing. They will also work to improve the resolution of the sensors so that they can detect objects farther away.

Faster Cloud Computing
Reliable software can now handle data on the fly rather than in batches

Source: “MapReduce Online”
Tyson Condie et al.
Proceedings of the seventh USENIX Symposium on Network Design and Implementation, April 28-30, 2010, San Jose, CA

Results: Researchers have modified Hadoop MapReduce, a software platform designed to reliably process large amounts of data on a cluster of computers (as is necessary in cloud computing). The changes decreased by several orders of magnitude the time the software takes to process data, without sacrificing the reliability the technology is known for.

Why it matters: The earlier version of Hadoop was too slow to handle applications that require real-time responsiveness, such as providing near-instant updates about the traffic or sales transactions on a website. The new version could expand the range of applications that can run on distributed computers. It could also make applications that are run in the cloud more reliable by allowing managers to catch abnormal behavior as soon as it happens.

Methods: The researchers reduced the time it took Hadoop MapReduce to complete jobs by adapting a technique called pipelining. Ordinarily, Hadoop waits until one task is complete before it will start a second; that makes it easier to handle the failure of a computer in the cluster. With pipelining, data can be sent and processed continuously before the first task is complete.

Next steps: One of the researchers would like to develop the system further so that it can be used to customize Web-page layouts in real time in response to user behavior.

Want to go ad free? No ad blockers needed.

Become an Insider
Already an Insider? Log in.

Uh oh–you've read all of your free articles for this month.

Insider Premium
$179.95/yr US PRICE

More from Intelligent Machines

Artificial intelligence and robots are transforming how we work and live.

Want more award-winning journalism? Subscribe to Insider Premium.
  • Insider Premium {! insider.prices.premium !}*

    {! insider.display.menuOptionsLabel !}

    Our award winning magazine, unlimited access to our story archive, special discounts to MIT Technology Review Events, and exclusive content.

    See details+

    What's Included

    Bimonthly magazine delivery and unlimited 24/7 access to MIT Technology Review’s website

    The Download: our daily newsletter of what's important in technology and innovation

    Access to the magazine PDF archive—thousands of articles going back to 1899 at your fingertips

    Special discounts to select partner offerings

    Discount to MIT Technology Review events

    Ad-free web experience

    First Look: exclusive early access to important stories, before they’re available to anyone else

    Insider Conversations: listen in on in-depth calls between our editors and today’s thought leaders

You've read all of your free articles this month. This is your last free article this month. You've read of free articles this month. or  for unlimited online access.