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Math @ Duke





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Yunliang Yu, IT Senior Manager

Yunliang Yu

Open source is an investment in the future.

FDS Motto: we serve and empower the faculty.

Contact Info:
Office Location:  029D Physics
Office Phone:  (919) 660-2803
Email Address:   send me a message
Web Page:   http://www.math.duke.edu/~yu

Office Hours:

12:01AM - 12:02AM every other day except today.
Not by appt :-)
Specialties:

Mathematics
Recent Publications

  1. Y. Yu, test 123 (March, 2010). [PNG, PDF]

Famous Sayings:
Your dream will come true, if you eat your soup.
    --- Angela Yu
Don't be a turkey; read a book.
    --- Christina Yu
Security = avoid "unexpected inputs for unintended results".
    --- moi
To learn and practice what is learned from time to time is pleasure, is it not? To have friends from afar is happiness, is it not? To be unperturbed when not appreciated by others is a gentleman, is it not?
    --- Kungfu Zi
Better to light a candle than to curse the darkness.
    --- Chinese Proverb

mathprograms.org, academicjobsonline.org, mathjobs.org, ShortURLs, sharedworkingplace.org, chinesecalligraphyandwoodcarving.

/. headline news :-)

  • SeaWorld and Others Discover That a Hashtag Can Become a Bashtag
    2015-03-29T16:37:00+00:00
    HughPickens.com writes Alison Griswold writes that in an effort to improve its tanking image, SeaWorld launched a new advertising campaign this week to educate the public about its "leadership in the care of killer whales" and other work to protect whales in captivity and in the wild. As part of that head-on initiative, someone at SeaWorld decided to invite Twitter users to pose their questions to the company directly using the hashtag #AskSeaWorld. That was not a good idea as twitter users bashed Sea World relentlessly.. "As easy as it is to make fun of SeaWorld here, the real question is why any company still thinks hosting an open Twitter forum could be good for public relations," writes Griswold. "So maybe SeaWorld's social and PR folks just really have no idea what they're doing. Even so, you'd think they'd have learned from the corporate failures before them." Let's review some of the times this has backfired, starting with the infamous McDonald's #McDStories Twitter campaign of January 2012. Rather than prompting customers to share their heart-warming McDonald's anecdotes, the hashtag gave critics a highly visible forum to share their top McDonald's horror stories. MacDonalds pulled the campaign within two hours but they discovered that crowd-sourced campaigns are hard to control. Three years later the #McDStories hashtag is still gathering comments. "Twitter Q&As are a terrible idea.," concludes Griswold. "A well-meaning hashtag gives critics an easy way to assemble and voice their complaints in a public forum. Why companies still try them is a great mystery. Maybe they'll all finally learn from SeaWorld and give this one horrible PR trick up for good."

    Read more of this story at Slashdot.

  • Festo Reveals New Robotic Ants and Butterflies
    2015-03-29T15:32:00+00:00
    mikejuk writes "Every year around this time of year Festo builds some amazing robot or other — last year it was a kangaroo. What could it possibly do to top previous amazing devices? What about some even more amazing robotic insects. BionicANT is designed not only look good but to demonstrate swarm intelligence. The robot not only looks like an ant, but it works like one. The design makes use of piezo bending transducers rather than servos to move. As well as being able to move its six legs, it also has a piezo-activated pair of pincers. The second insect robot is a butterfly — eMotion. For flying machines these are incredibly lightweight at 32 grams. The bodies are laser sintered and the wings use carbon fiber rods. Two miniature servo motors are attached to the body and each wing. The electronics has a microcontroller, an inertial sensor consisting of gyro, accelerometer and compass and two radio modules. Flying time is around 3 or 4 minutes."

    Read more of this story at Slashdot.

  • Arduino Dispute Reaches Out To Distributors
    2015-03-29T14:29:00+00:00
    szczys writes Two companies are claiming ownership of the Arduino Trademark. The most recent development in this sad state of affairs is a letter from Arduino SRL to long-time Distributors of Arduino products. SRL is claiming they are the real Arduino, but there are some tasty tidbits including a Q/A section with some peculiar answers. From the article: "In short, Arduino LLC has been working on developing the Arduino platform, software, and community while Smart Projects / Arduino SRL was the major official producer of the hardware for most boards. Both are claiming to 'be' Arduino, and going after each other in court. So it’s not strange that Arduino SRL would like to try to keep its hold on the distribution channels."

    Read more of this story at Slashdot.

  • SpaceX's New Combustion Technologies
    2015-03-29T13:25:00+00:00
    An anonymous reader shares this story that takes a look at some of the advances SpaceX is working on. "Getting a small group of human beings to Mars and back is no easy task, we learned at the recent GPU Technology Conference in San Jose hosted graphics chip and accelerator maker Nvidia. One of the problems with such a mission is that you need a very large and efficient rocket engine to get the amount of material into orbit for the mission, explained Adam Lichtl, who is director of research at SpaceX and who with a team of a few dozen programmers is try to crack the particularly difficult task of better simulating the combustion inside of a rocket engine. You need a large engine to shorten the trip to Mars, too....Not only do you need a lot of stuff to get to Mars and sustain a colony there, but you also need a way to generate fuel on Mars to come back to Earth. All of these factors affect the design of the rocket engine....As if these were not problems enough, there is another really big issue. The computational fluid dynamics, or CFD, software that is used to simulate the movement of fluids and gases and their ignition inside of all kinds of engines is particularly bad at assisting in rocket engine design. 'Methane is a fairly simple hydrocarbon that is perfectly good as a fuel,' Lichtl said. 'The challenge here is to design an engine that works efficiently with such a compound. But rocket engine CFD is hard. Really hard.'"

    Read more of this story at Slashdot.

  • Why the Final Moments Inside a Cockpit Are Heard But Not Seen
    2015-03-29T12:21:00+00:00
    jones_supa writes: There's no video footage from inside the cockpit of the Germanwings flight that left 150 people dead — nor is such footage recorded from any other commercial airline crash in recent years. Unlike many other vehicles operating with heightened safety concerns, airline cockpits don't come with video surveillance. The reason, in part, is that airline pilots and their unions have argued vigorously against what they see as an invasion of privacy that would not improve aviation safety. The long debate on whether airplane cockpits in the U.S. should be equipped with cameras dates back at least 15 years, when the National Transportation Safety Board (NTSB) first pushed regulators to require video monitoring following what the agency called "several accidents involving a lack of information regarding crewmember actions and the flight deck environment." The latest NTSB recommendation for a cockpit image system (PDF) came in January 2015. Should video streams captured inside the plane become a standard part of aviation safety measures?

    Read more of this story at Slashdot.

  • Material Made From Crustaceans Could Combat Battlefield Blood Loss
    2015-03-29T09:12:00+00:00
    MTorrice writes: A foam composed of a polymer derived from crustacean shells may prevent more soldiers from falling victim to the most prolific killer on the battlefield: blood loss. Pressure is one of the best tools that medics have to fight bleeding, but they can't use it on severe wounds near organs. Here, compression could do more harm than good. First responders have no way to effectively dam blood flows from these non-compressible injuries, which account for the majority of hemorrhagic deaths. The new foam could help stop bleeding in these types of injuries. It relies on chitosan, a biopolymer that comes from processed crustacean shells. By modifying the chitosan, the developers gave the material the ability to anchor blood cells into gel-like networks, essentially forming blood clots. The researchers dispersed the modified chitosan in water to create a fluid they could spray directly onto noncompressible wounds.

    Read more of this story at Slashdot.

  • Australian Government Outlines Website-Blocking Scheme
    2015-03-29T06:07:00+00:00
    angry tapir writes: The Australian government has revealed its (previously mooted) proposed legislation that will allow copyright holders to apply for court orders that will force ISPs to block access to pirate websites. It forms part of a broader Australian crackdown on online copyright infringement, which also includes a warning notice scheme for alleged infringers. They're not the only ones getting on board with website blocking — a judge in Spain ruled that local ISPs must block access to The Pirate Bay.

    Read more of this story at Slashdot.

  • Graphene Light Bulbs Coming To Stores Soon
    2015-03-29T03:03:00+00:00
    An anonymous reader writes: A light bulb made from graphene — said by its UK developers to be the first commercially viable consumer product using the super-strong carbon — is to go on sale later this year. The dimmable LED bulb with a graphene-coated filament was designed at Manchester University, where the material was discovered in 2004. It is said to cut energy use by 10% and last longer owing to its conductivity. It is expected to be priced lower than current LED bulbs, which cost about £15 (~$22) each.

    Read more of this story at Slashdot.

  • Measuring How Much "Standby Mode" Electricity For Game Consoles Will Cost You
    2015-03-29T00:00:00+00:00
    An anonymous reader writes: Modern game consoles have a "standby" mode, which you can use if you want the console to instantly turn on while not drawing full power the whole time it's idle. But manufacturers are vague about how much power it takes to keep the consoles in this standby state. After a recent press release claiming $250 million worth of electricity was used to power Xbox Ones in standby mode in the past year, Ars Technica decided to run some tests to figure out exactly how much power is being drawn. Their conclusions: the PS4 draws about 10 Watts, $10-11 in extra electricity charges annually. The Xbox One draws 12.9W, costing users $13-$14 in extra electricity charges annually. The Wii U draws 13.3W, costing users $14-$15 in extra electricity charges annually. These aren't trivial amounts, but they're a lot less than simply leaving the console running and shutting off the TV when you aren't using it: "Leaving your PS4 sitting on the menu like this all year would waste over $142 in electricity costs."

    Read more of this story at Slashdot.

  • Russia Wants To Work With NASA On a New Space Station
    2015-03-28T22:56:00+00:00
    HughPickens.com writes with news that Russian officials are talking about working with NASA to build a new space station as a replacement for the ISS after its operations end in 2024. Igor Komarov, head of the Russian Federal Space Agency, was unambiguous in his support for such a partnership. He added, "It will be an open project. It will feature not only the current members of the ISS." NASA, while careful not to discourage future cooperation, was not so enthusiastic. They said, "We are pleased Roscomos wants to continue full use of the International Space Station through 2024 -- a priority of ours -- and expressed interest in continuing international cooperation for human space exploration beyond that. The United States is planning to lead a human mission to Mars in the 2030s, and we have advanced that effort farther than at any point in NASA's history. We welcome international support for this ambitious undertaking." They reiterated that there are no formal agreements in place as of yet. These comments come as three crew members arrive at the ISS, two of whom will be up there for an entire year.

    Read more of this story at Slashdot.

  • Citizen Scientists Develop Eye Drops That Provide Night Vision
    2015-03-28T21:51:00+00:00
    rtoz writes: A group of scientists in California have successfully created eye drops that temporarily enable night vision. They use mixture of insulin and a chemical known as Chlorin e6 (Ce6) to enable the user to view objects clearly in darkness up to 50 meters away. Ce6 is found in some deep-sea fish and often used to treat night blindness. The solution starts to work within an hour of being applied to the user's eyes, and lasts for several hours afterward. The test subject's eyesight returned to normal the next day. The organization Science for the Masses has released a paper detailing the experiment on their website.

    Read more of this story at Slashdot.

  • Europe Agrees On Regulatory Drone Framework
    2015-03-28T20:49:00+00:00
    Hallie Siegel writes: Not a week goes by where some aspect of drone regulation fails to make the news. But for any regulated industry where technology is advancing faster than new rules can be agreed upon, it will undoubtedly cause a few headaches. This week closes with a very positive announcement from European stakeholders on the future of drones. During a two-day conference in Riga, the European aviation community found broad agreement on the main principles to guide a regulatory framework to allow drone operations throughout Europe from 2016 onward.

    Read more of this story at Slashdot.

  • Best Buy Kills Off Future Shop
    2015-03-28T19:45:00+00:00
    Lirodon writes: Future Shop, a Canadian electronics chain that was bought by Best Buy in 2001, but continued to operate in parallel with the newly-opened Canadian locations of the U.S. retailer, is no more. Today, the company abruptly announced the closure of the Future Shop chain, and the permanent closure of 66 of its remaining 131 locations. The remaining 65 Future Shop locations (specifically, those that weren't within driving, or even walking distance of a Best Buy to begin with) will be converted to Best Buy stores over the next few days. This is just the latest step in Best Buy's efforts to downsize its Canadian operations and focus on online retail. The new, downsized chain will consist of 136 Best Buy stores (and 56 of the small Best Buy Mobile stores) in Canada. Still, it's sad to see such an iconic brand killed off like this.

    Read more of this story at Slashdot.

  • Commercial Flamethrower Successfully Crowdfunded
    2015-03-28T18:40:00+00:00
    ColdWetDog writes: You've always wanted one, of course. Zombies, the occasional alien infestation. The neighbor's smelly roses. You just need to be prepared for things. You can get freeze dried food, AR15's, enough ammo to start a small police action (at least here in the U.S. -- YMMV), but it has been difficult to get a modern, portable flamethrower until now. CNET has a brief explanation on the XM42, which doubled its Indiegogo funding target in just a few days.

    Read more of this story at Slashdot.

  • Another Patent Pool Forms For HEVC
    2015-03-28T17:36:00+00:00
    An anonymous reader writes: A new patent pool, dubbed HEVC Advance, has formed for the HEVC video codec. This pool offers separate licensing from the existing MPEG LA HEVC patent pool. In an article for CNET, Stephen Shankland writes, "HEVC Advance promises a 'transparent' licensing process, but so far it isn't sharing details except to say it's got 500 patents it describes as essential for using HEVC, that it plans to unveil its license in the third quarter, and that expected licensors include General Electric, Technicolor, Dolby, Philips and Mitsubishi Electric. The group's statement suggested that some patent holders weren't satisfied with the money they'd make through MPEG LA's license. One of HEVC Advance's goals is 'delivering a balanced business model that supports HEVC commercialization.' ... HEVC Advance and MPEG LA aren't detailing what led to two patent pools, an outcome that undermines MPEG LA's attempt to offer a convenient 'one-stop shop' for companies needing a license." Perhaps this will lead to increased adoption of royalty-free video codecs such as VP9. Monty Montgomery of Xiph has some further commentary.

    Read more of this story at Slashdot.

 

dept@math.duke.edu
ph: 919.660.2800
fax: 919.660.2821

Mathematics Department
Duke University, Box 90320
Durham, NC 27708-0320