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John Lemke

Teaching robots to move like humans (w/ Video) - 0 views

www.physorg.com/...11-03-robots-humans-video.html

teaching AI interaction mimic GeorgiaTech wroteatlockergnome robot 2011 writeabout technology tech robotics robots

shared by John Lemke on 11 Mar 11 - No Cached
  • John Lemke on 11 Mar 11
     
    "It's important to build robots that meet people's social expectations because we think that will make it easier for people to understand how to approach them and how to interact with them," said Andrea Thomaz, assistant professor in the School of Interactive Computing at Georgia Tech's College of Computing. Thomaz, along with Ph.D. student Michael Gielniak, conducted a study in which they asked how easily people can recognize what a robot is doing by watching its movements.
John Lemke

'Solid' light could compute previously unsolvable problems - Princeton Engine... - 0 views

www.princeton.edu/...archive

2014 indienationnews light engineering princeton physics cryatalization

shared by John Lemke on 11 Sep 14 - No Cached
  • The researchers are not shining light through crystal – they are transforming light into crystal. As part of an effort to develop exotic materials such as room-temperature superconductors, the researchers have locked together photons, the basic element of light, so that they become fixed in place.
  • The results raise intriguing possibilities for a variety of future materials. But the researchers also intend to use the method to address questions about the fundamental study of matter, a field called condensed matter physics.
  • To build their machine, the researchers created a structure made of superconducting materials that contains 100 billion atoms engineered to act as a single "artificial atom." They placed the artificial atom close to a superconducting wire containing photons. By the rules of quantum mechanics, the photons on the wire inherit some of the properties of the artificial atom – in a sense linking them. Normally photons do not interact with each other, but in this system the researchers are able to create new behavior in which the photons begin to interact in some ways like particles. "We have used this blending together of the photons and the atom to artificially devise strong interactions among the photons," said Darius Sadri, a postdoctoral researcher and one of the authors. "These interactions then lead to completely new collective behavior for light – akin to the phases of matter, like liquids and crystals, studied in condensed matter physics."
John Lemke

New Theory Suggests Parallel Universes Interact With And Affect Our Own Universe | IFLS... - 0 views

www.iflscience.com/...universes-overlap-and-interact

2014 theory parallel affect indienationnews physics universe

shared by John Lemke on 06 Nov 14 - No Cached
  • This new theory suggests that all of these infinite multiple worlds overlap and occupy the same region of time and space simultaneously, just like a quantum state. 
  • Under this new interpretation, some worlds in parallel universes would be nearly identical. In others, the “Butterfly Effect” is responsible for completely different outcomes. Each universe is equally real; it isn’t that one universe is the truth while others are bizarre copies or lesser in any way. Wiseman also believes that the quantum forces responsible for driving this shared existence are also responsible for causing quantum interactions between the worlds.
John Lemke

Ask Ethan #55: Could a Manned Mission to Mars Abort? - Starts With A Bang! - Medium - 0 views

medium.com/...ion-to-mars-abort-d3995c855466

2014 exploration space spaceflight spacecraft spaceexploration spacetravel mars 2014.09.29-TNN

shared by John Lemke on 28 Sep 14 - No Cached
  • No humans have ever traveled farther away from Earth than the crew of Apollo 13 did, as they circled around the far side of the Moon close to lunar apogee, achieving a maximum distance of 400,171 km above the Earth’s surface on April 15, 1970. But when the first manned spaceflight to another planet occurs, that record will be shattered, and in a mere matter of days.
  • The way we currently reach other worlds with our present technology — or any remote location in the Universe — involves three distinct stages:The initial launch, which overcomes the Earth’s gravitational binding energy and starts our spacecraft off with a reasonably large (on the order of a few km/s) velocity relative to the Earth’s motion around the Sun.On-board course corrections, where very small amounts of thrust accelerate the spacecraft to its optimal trajectory.And gravity assists, where we use the gravitational properties of other planets in orbit around the Sun to change our spacecraft’s velocity, either increasing or decreasing its speed with every encounter.It’s through the combination of these three actions that we can reach any location — if we’re patient and we plan properly — with only our current rocket technology.
    • John Lemke
      John Lemke on 28 Sep 14
       
      How we can do it now, if we plan right.
  • The initial launch is a very hard part right now. It takes a tremendous amount of resources to overcome the Earth’s gravitational pull, to accelerate a significant amount of mass to the Earth’s escape velocity, and to raise it all the way up through the Earth’s atmosphere.
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  • The most optimal one for a one-way trip to Mars, for those of you wondering, that minimizes both flight time and the amount of energy needed, involves simply timing your launch right.
    • John Lemke
      John Lemke on 28 Sep 14
       
      The cheapest and the fastest. The one way ticket option.
  • When a planet orbits the Sun, there’s a lot of energy in that system, both gravitational energy and kinetic energy. When a third body interacts gravitationally as well, it can either gain some energy by stealing it from the Sun-planet system, or it can lose energy by giving it up to the Sun-planet system. The amount of energy performed by the spacecraft’s thrusters is often only 20% (or less) of the energy either gained-or-lost from the interaction!
    • John Lemke
      John Lemke on 28 Sep 14
       
      The transfer of energy involved to change speeds.
John Lemke

David Byrne and Cory Doctorow Explain Music and the Internet | culture | Torontoist - 0 views

torontoist.com/...explain-music-and-the-internet

2012 indienationnews intelectualProperty law legal copyright music sampleing culture business businessmodel

shared by John Lemke on 24 Sep 12 - No Cached
  • Byrne and Doctorow were there to talk about how the internet has affected the music business. While that was certainly a large part of the discussion, the conversation also touched on all the ways technology and music interact, from file sharing to sampling.
  • Doctorow pointed out that two of the best-selling and most critically acclaimed hip-hop records of the 1980s—Public Enemy’s It Takes a Nation of Millions to Hold Us Back, and the Beastie Boys Paul’s Boutique—would have each cost roughly $12 million to make given today’s rules surrounding sample clearance.
  • “In the world of modern music, there are no songs with more than one or two samples, because no one wants to pay for that,” Doctorow said. “So, there’s a genre of music that, if it exists now, exists entirely outside the law. Anyone making music like Paul’s Boutique can’t make money from it, and is in legal jeopardy for having done it. Clearly that’s not what we want copyright to do.” When the conversation turned to downloads and digital music distribution, both men were surprisingly passionate on the topic of digital rights management, and how it’s fundamentally a bad idea.
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  • Doctorow argued that the way humans have historically shared music is totally antithetical to the idea of copyright laws. He pointed out that music predates not only the concept of copyright, but language itself. People have always wanted to share music, and, in an odd way, the sharing of someone else’s music is embedded in the industry’s business model, no matter how badly some may want to remove it.
  • John Lemke on 24 Sep 12
     
    "Doctorow pointed out that two of the best-selling and most critically acclaimed hip-hop records of the 1980s-Public Enemy's It Takes a Nation of Millions to Hold Us Back, and the Beastie Boys Paul's Boutique-would have each cost roughly $12 million to make given today's rules surrounding sample clearance."
John Lemke

US banks hit by more than a week of cyberattacks (Update) - 0 views

phys.org/...9-banks-week-cyberattacks.html

2012 banks Cyberwarefare cyber warfare cyberattack cyberwar USA Akamai Joe Lieberman

shared by John Lemke on 29 Sep 12 - No Cached
    • John Lemke
      John Lemke on 29 Sep 12
       
      They believe it was not a hacktivist attack because they are usually also associated with a rise in IRC and social network activity, those who would be joining the hacktivist event, and this even had no such spike.
  • Could a state actor be at play? U.S. Senator Joe Lieberman, without offering any proof, said he believed the assaults were carried out by Iran in retaliation for tightened economic sanctions imposed by the United States and its allies.
  • only a handful of groups out there that have the technical ability or incentive
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  • at least half a dozen banks—including the Bank of America, JPMorgan Chase, and Citigroup—have witnessed traffic surges and disruptions. Not all have confirmed they were the victims of an online onslaught, but such surges are a hallmark of denial-of-service attacks, which work by drowning target websites with streams of junk data.
  • Such attacks are fairly common and generally don't compromise sensitive data or do any lasting damage. Still, they can be a huge headache for companies that rely on their websites to interact with customers.
  • Most say the recent spate of attacks has been unusually powerful. PNC bank, which was hit on Thursday, has never seen such a strong surge in traffic, spokesman Fred Solomon said in a telephone interview. Smith said he estimated the flow of data at 60 to 65 gigabits per second.
John Lemke

Elusive particle that is its own antiparticle observed -- ScienceDaily - 0 views

www.sciencedaily.com/...141002141757.htm

2014 particle indienationnews technology tech science physic

shared by John Lemke on 06 Oct 14 - No Cached
  • Using a two-story-tall microscope floating in an ultralow-vibration lab at Princeton's Jadwin Hall, the scientists captured a glowing image of a particle known as a "Majorana fermion" perched at the end of an atomically thin wire -- just where it had been predicted to be after decades of study and calculation dating back to the 1930s.
  • The hunt for the Majorana fermion began in the earliest days of quantum theory when physicists first realized that their equations implied the existence of "antimatter" counterparts to commonly known particles such as electrons. In 1937, Italian physicist Ettore Majorana predicted that a single, stable particle could be both matter and antimatter. Although many forms of antimatter have since been observed, the Majorana combination remained elusive.
  • Despite combining qualities usually thought to annihilate each other -- matter and antimatter -- the Majorana fermion is surprisingly stable; rather than being destructive, the conflicting properties render the particle neutral so that it interacts very weakly with its environment. This aloofness has spurred scientists to search for ways to engineer the Majorana into materials, which could provide a much more stable way of encoding quantum information, and thus a new basis for quantum computing.
John Lemke

Scientists May Have Decoded One of the Secrets to Superconductors | Science | WIRED - 0 views

www.wired.com/...the-secrets-to-superconductors

technology 2014 superconductors indienationnews

shared by John Lemke on 09 May 14 - No Cached
  • “In the same way that a laser is a hell of a lot more powerful than a light bulb, room-temperature superconductivity would completely change how you transport electricity and enable new ways of using electricity,” said Louis Taillefer, a professor of physics at the University of Sherbrooke in Quebec.
  • ripples of electrons inside the superconductors that are called charge density waves. The fine-grained structure of the waves, reported in two new papers by independent groups of researchers, suggests that they may be driven by the same force as superconductivity. Davis and his colleagues directly visualized the waves in a study posted online in April, corroborating indirect evidence reported in February by a team led by Riccardo Comin, a postdoctoral fellow at the University of Toronto.
  • Taken together, the various findings are at last starting to build a comprehensive picture of the physics behind high-temperature superconductivity. “This is the first time I feel like we’re making real progress,” said Andrea Damascelli, a professor of physics at the University of British Columbia who led two recent studies on charge density waves. “A lot of different observations which have been made over decades did not make sense with each other, and now they do.”
  • ...4 more annotations...
  • The community remained divided until 2012, when two groups using a technique called resonant X-ray scattering managed to detect charge density waves deep inside cuprates, cementing the importance of the waves. As the groups published their findings in Science and Nature Physics, two new collaborations formed, one led by Damascelli and the other by Ali Yazdani of Princeton University, with plans to characterize the waves even more thoroughly. Finishing in a dead heat, the rival groups’ independent studies appeared together in Science in January 2014. They confirmed that charge density waves are a ubiquitous phenomenon in cuprates and that they strenuously oppose superconductivity, prevailing as the temperature rises.
  • y applying Sachdev’s algorithm to a new round of data, Davis and his group mapped out the structure of the charge density waves, showing that the d-wave distribution of electrons was, indeed, their source.
  • The waves’ structure is particularly suggestive, researchers say, because superconducting pairs of electrons also have a d-wave configuration. It’s as if both arrangements of electrons were cast from the same mold. “Until a few months ago my thought was, OK, you have charge density waves, who cares? What’s the relevance to the high-temperature superconductivity?” Damascelli said. “This tells me these phenomena feed off the same interaction.”
  • In short, antiferromagnetism could generate the d-wave patterns of both superconductivity and its rival, charge density waves.
John Lemke

Stepson of Stuxnet stalked Kaspersky for months, tapped Iran nuke talks | Ars Technica - 0 views

arstechnica.com/...-months-tapped-iran-nuke-talks

2015 kaspersky iran ars stuxnet malware cyber warfare espionage blackhat attack virus zero-day

shared by John Lemke on 10 Jun 15 - No Cached
  • Since some time in the second half of 2014, a different state-sponsored group had been casing their corporate network using malware derived from Stuxnet, the highly sophisticated computer worm reportedly created by the US and Israel to sabotage Iran’s nuclear program.
  • the malware was more advanced than the malicious programs developed by the NSA-tied Equation Group that Kaspersky just exposed. More intriguing still, Kaspersky antivirus products showed the same malware has infected one or more venues that hosted recent diplomatic negotiations the US and five other countries have convened with Iran over its nuclear program.
  • We see this battle or arms race emerging and now it involves some kind of confrontation between the security industry and nation-state sponsored spies
  • ...3 more annotations...
  • Kaspersky officials first became suspicious their network might be infected in the weeks following February's Security Analyst Summit, where company researchers exposed a state-sponsored hacking operation that had ties to some of the developers of Stuxnet. Kaspersky dubbed the highly sophisticated group behind the 14-year campaign Equation Group. Now back in Moscow, a company engineer was testing a software prototype for detecting so-called advanced persistent threats (APTs), the type of well-organized and highly sophisticated attack campaigns launched by well-funded hacking groups. Strangely enough, the developer's computer itself was having unusual interactions with the Kaspersky network. The new APT technology under development, it seemed, was one of several things of interest to the Duqu attackers penetrating the Kaspersky fortress. "For the developer it was important to find out why" his PC was acting oddly, Kamluk said. "Of course, he did not consider that machine could be infected by real malware. We eventually found an alien module that should not be there that tried to mask behind legitimate looking modules from Microsoft. That was the point of discovery."
  • What they found was a vastly overhauled malware operation that made huge leaps in stealth, operational security, and software design. The Duqu actors also grew much more ambitious, infecting an estimated 100 or so targets, about twice as many as were hit by the 2011 version.
  • So the Duqu 2.0 attackers pulled an audacious feat that Kaspersky researchers had never seen before. Virtually all of the malware resided solely in the memory of the compromised computers or servers. When one of them was restarted, the infection would be purged, but as the rebooted machine reconnected to the network, it would be infected all over again by another compromised computer in the corporate network. The secret lynchpin making this untraceable reinfection scheme possible was the Windows vulnerability Microsoft patched only Tuesday, which has been designated
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