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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 :-)

  • Novel Model Illustrates The Finer Details Of Nuclear Fission
    2016-05-03T07:03:00+00:00
    mdsolar quotes a report from Phys.Org: For nearly 80 years, nuclear fission has awaited a description within a microscopic framework. In the first study of its kind, scientists collaborating from the University of Washington, Warsaw University of Technology (Poland), Pacific Northwest National Laboratory, and Los Alamos National Laboratory, developed a novel model to take a more intricate look at what happens during the last stages of the fission process. Using the model, they determined that fission fragments remain connected far longer than expected before the daughter nuclei split apart. Moreover, they noted the predicted kinetic energy agreed with results from experimental observations. This discovery indicates that complex calculations of real-time fission dynamics without physical restrictions are feasible and opens a pathway to a theoretical microscopic framework with abundant predictive power.

    Read more of this story at Slashdot.

  • China Creates World's First Graphene Electronic Paper
    2016-05-03T03:33:00+00:00
    An anonymous reader writes from a report published on Tech Times: China has developed the world's first graphene electronic paper that can possibly revolutionize the screen displays on electronic gadgets such as wearable devices and e-readers. Developed by Guangzhou OED Technologies in partnership with another company in the Chongqing Province, the material is also the world's lightest and strongest material in prevalence today. It's 0.335 nanometers thick and can be used to create hard or flexible graphene displays. Graphene e-paper comes with the capability to conduct both heat and electricity, and it can supposedly enhance optical displays to a brighter level, owing to its high-light transmittance properties. What about cost? Since it's derived from carbon, graphene-based e-papers can be easily produced cost-effectively. Traditional e-papers use indium metal for their display, which is very expensive and rare to source.

    Read more of this story at Slashdot.

  • UAE To Build Artificial Mountain To Improve Rainfall
    2016-05-03T02:10:00+00:00
    An anonymous reader writes: The United Arab Emirates is in the early stages of developing an artificial mountain that would force air upwards and create clouds that could produce additional rainfall. While the Middle East and Africa continues to get hotter, researchers are further motivated and more desperate for solutions to maximize rainfall. "Building a mountain is not a simple thing," said NCAR scientist and lead researcher Roelof Bruintjes. "We are still busy finalizing assimilation, so we are doing a spread of all kinds of heights, widths and locations [as we simultaneously] look at the local climatology." The specific location has yet to be decided on as the team is still testing out different sites across the UAE. "If [the project] is too expensive for [the government], logically the project won't go through, but this gives them an idea of what kind of alternatives there are for the long-term future." Bruintjes said. "If it goes through, the second phase would be to go to an engineering company and decide whether it is possible or not."

    Read more of this story at Slashdot.

  • Kim Jong-Un Bans All Weddings, Funerals And Freedom Of Movement In North Korea
    2016-05-03T01:27:00+00:00
    An anonymous reader quotes a report from The Independent: Weddings and funerals have been banned and Pyongyang is in lockdown as preparations for a once-in-a-generation party congress get underway in North Korea. The ruling Worker's Party of Korea, headed by the country's leader, Kim Jong-un, is due to stage the first gathering of its kind for 36 years on Friday. Free movement in and out of the capital has also been forbidden and there has been an increase in inspections and property searches, according to Daily NK, which claims to have sources in the country. The temporary measures are said to be an attempt to minimize the risk of "mishaps" at the event, according to Cheong Joon-hee, a spokesman at South Korea's Unification Ministry. Meanwhile, North Korea has been conducting missile tests left and right, many of which have failed miserably.

    Read more of this story at Slashdot.

  • LG's New Fingerprint Sensor Doesn't Need A Button
    2016-05-03T00:44:00+00:00
    An anonymous reader quotes a report from Mashable: LG Innotek has developed a fingerprint sensor that's placed under a glass surface instead of in a physical button, the company announced Sunday. The new sensor could lead to smartphones that you can unlock by placing your finger on the phone screen. The LG-owned electronics parts manufacturer achieved this by cutting out a 0.01-inch thick slot in the lower part of a smartphone's cover glass, and then inserting a very thin fingerprint sensor into it. In other words, the sensor is still under the cover glass, but the slot moves the sensor close enough to the surface to read a fingerprint. That way, the sensor is protected from water and scratches, and can be installed anywhere under the phone's glass surface.

    Read more of this story at Slashdot.

  • China Probes Baidu Over False Medical Ads After Student Dies
    2016-05-03T00:01:00+00:00
    hackingbear writes: China's Internet regulator said on Monday it will send a team to investigate Baidu Inc over the death of a university student who used the Chinese search engine to look for treatment for his rare cancer, and to find an experimental treatment offered by the Second Hospital of Beijing Armed Police Corps, which eventually proved ineffective. Before dying, Wei accused Baidu online of promoting false medical information, as well as the hospital for misleading advertising in claiming a high success rate for the treatment, state radio said. The post attracted a large public outcry. Baidu says around one quarter of its revenues come from medical and health-care advertisers.

    Read more of this story at Slashdot.

  • Self-Driving Features Could Lead To More Sex In Moving Cars, Expert Warns
    2016-05-02T23:18:00+00:00
    An anonymous reader writes: According to CBC.ca, "At least one expert is anticipating that, as the so-called 'smart' cars get smarter, there will eventually be an increase in an unusual form of distracted driving: hanky-panky behind the wheel." Barrie Kirk of the Canadian Automated Vehicles Centre of Excellence said, "I am predicting that, once computers are doing the driving, there will be a lot more sex in cars. That's one of several things people will do which will inhibit their ability to respond quickly when the computer says to the human, 'Take over.'" Federal officials, who have been tasked with building a regulatory framework to govern driverless cars, highlighted their concerns in briefing notes compiled for Transport Minister Marc Garneau. "Drivers tend to overestimate the performance of automation and will naturally turn their focus away from the road when they turn on their auto-pilot," said the note. The Tesla autopilot feature has been receiving the most criticism as there have been many videos posted online showing Tesla drivers engaged in questionable practices, including reading a newspaper or brushing their teeth.

    Read more of this story at Slashdot.

  • Greenpeace Leaks Big Part Of Secret TTIP Documents
    2016-05-02T22:35:00+00:00
    An anonymous reader writes: The environmental group Greenpeace has obtained 248 pages of classified documents from the Transatlantic Trade and Investment Partnership (TTIP) trade talks. The group warns EU standards on the environment and public health risk being undermined by compromises with the US, specifically that US corporations may erode Europe's consumer protections. The TTIP would "harmonize regulations across a huge range of business sectors, providing a boost to exporters on both sides of the Atlantic," writes the BBC. After the Greenpeace leak was published, EU Trade Commissioner Cecilia Malmstroem said in her blog, "I am simply not in the business of lowering standards." Meanwhile, Greenpeace EU director Jorgo Riss said, "These leaked documents confirm what we have been saying for a long time: TTIP would put corporations at the center of policy-making, to the detriment of environment and public health." You can be the judge for yourself. The leaked documents are available for download here.

    Read more of this story at Slashdot.

  • Climate-Exodus Expected In The Middle East And North Africa
    2016-05-02T21:53:00+00:00
    An anonymous reader quotes a report from Phys.Org: Researchers of the Max Planck Institute for Chemistry and the Cyprus Institute in Nicosia have calculated that the Middle East and North Africa could become so hot that human habitability is compromised. The goal of limiting global warming to less than two degrees Celsius, agreed at the recent UN climate summit in Paris, will not be sufficient to prevent this scenario. The result is deeply alarming: Even if Earth's temperature were to increase on average only by two degrees Celsius compared to pre-industrial times, the temperature in summer in these regions will increase more than twofold. This means that during hot days temperatures south of the Mediterranean will reach around 46 degrees Celsius (approximately 114 degrees Fahrenheit) by mid-century. Such extremely hot days will occur five times more often than was the case at the turn of the millennium. In combination with increasing air pollution by windblown desert dust, the environmental conditions could become intolerable and may force people to migrate.

    Read more of this story at Slashdot.

  • 20-Yr-Old Compaq Laptop Is Still Crucial to Maintaining McLaren's Multi-Million Dollar Cars
    2016-05-02T21:10:00+00:00
    An anonymous reader writes: It may come as a surprise to many, but the 20-year-old Compaq LTE 5280 still plays a vital role in maintaining multi-million dollar McLaren F1s. Jalopnik recently visited McLaren's Special Operations workshop where it found several of Compaq's old laptops serving their masters. Why do they rely on these dated computers, you ask? A McLaren Special Operations staff explains, "The reason we need those specific Compaq laptops is that they run a bespoke CA card which is installed into them. The CA card is an interface between the laptop software (which is DOS based) and the car. We are currently working on a new interface which will be compatible with modern laptops as the old Compaqs are getting less and less reliable and harder to find." For those wondering, the Compaq LTE 5280 comes with a 120MHz Intel Pentium processor, up to "80MB" of RAM, and up to 16MB of HDD.

    Read more of this story at Slashdot.

  • Samsung, Nvidia End Their Patent Lawsuits
    2016-05-02T20:40:00+00:00
    Reader itwbennett writes: In September 2014, Nvidia sued both Samsung and Qualcomm, asking for shipments of Galaxy phones and tablets with graphics processors from Qualcomm, ARM and Imagination Technologies to be blocked. Samsung fired back, suing Nvidia for patent infringement, and for supposedly false claims by Nvidia that its Tegra K1 was the world's fastest mobile processor. Now, in an agreement announced today, Nvidia and Samsung have agreed to 'settle all outstanding IP litigation'. Under the agreement, the companies will license 'a small number' of patents to each other, though they said there's no broad cross-license agreement. There's also no financial payment. And no mention was made of Qualcomm.

    Read more of this story at Slashdot.

  • Without Encryption, Everything Stops, Says Snowden
    2016-05-02T20:10:00+00:00
    An anonymous reader writes about Snowden's appearance on a debate with CNN's Fareed Zakaria: Edward Snowden defended the importance of encryption, calling it the "backbone of computer security." He said, "Encryption saves lives. Encryption protects property. Without it, our economy stops. Our government stops. Everything stops. Our intelligence agencies say computer security is a bigger problem than terrorism, than crime, than anything else," he noted. "[...] Lawful access to any device or communication cannot be provided to anybody without fatally compromising the security of everybody."

    Read more of this story at Slashdot.

  • Gas Delivery Startups Want to Fill Up Your Car Anywhere, But It Might Not Be Legal
    2016-05-02T19:30:00+00:00
    Eric Newcomer, reporting for Bloomberg: A new crop of startups are trying to make gas stations obsolete. Tap an app, and they'll bring the gas to you, filling up your car while you're at work or at home. Filld, WeFuel, Yoshi, Purple and Booster Fuels have started operating in a few cities including San Francisco, Los Angeles, Palo Alto, Nashville, Tennessee, and Atlanta, Georgia. But officials in some of those cities say that driving around in a pickup truck with hundreds of gallons of gasoline might not be safe. "It is not permitted," said Lt. Jonathan Baxter, a spokesman for the San Francisco fire department, adding that if San Francisco residents see any companies fueling vehicles in the city, they should call the fire department. "We haven't talked to them. I don't know about that. It's news to me," said Nick Alexander, co-founder of Yoshi. "You can never ask for permission because no one will give it," said Chris Aubuchon, the chief executive officer at Filld. The Los Angeles Fire Department said it's drafting a policy around gasoline delivery. "Our current fire code does not allow this process; however, we are exploring a way this could be allowed with some restrictions," said Capt. Daniel Curry, a spokesman for the city's fire department.

    Read more of this story at Slashdot.

  • WhatsApp Blocked in Brazil for 72 Hours Over Data Dispute
    2016-05-02T18:49:00+00:00
    An anonymous reader cites an article on TechCrunch: WhatsApp, Facebook's messaging service that recently rolled out end-to-end encryption to its users, will be blocked in Brazil for 72 hours, starting this afternoon. A Brazilian judge ordered telecom providers in the country to block WhatsApp today in a dispute over access to encrypted data. Judge Marcel Montalvao has ordered WhatsApp to turn over chat records related to a drug investigation, but WhatsApp has argued that it cannot access the chats in an unencrypted form and therefore cannot provide the required records to the court. [...] This isn't Montalvao's first clash with WhatsApp, which boasts more than 100 million Brazilian users. The judge ordered the arrest of Facebook's vice president for Latin America, Diego Dzodan, in March. Facebook has said that WhatsApp operates with relative independence and that Dzodan has no control over WhatsApp data.American lawyer and journalist Glenn Greenwald said: "WhatsApp shut down again in Brazil as of 1 pm ET today: used by 100m people, 91% of those online: all from 1 judge."

    Read more of this story at Slashdot.

  • Chrome Overtakes Internet Explorer For Most Popular Desktop Browser
    2016-05-02T18:10:00+00:00
    Google Chrome is now the most widely used desktop browser. According to the latest figures from marketing and research firm Net Applications (which looked into data from over 40,000 websites), in April, Chrome captured 41.66 percent of the market, surpassing Internet Explorer which now sits at 41.35 percent. Brad Sams writes:This growth by Chrome should not be too surprising as Microsoft has left Internet Explorer behind for Edge but unfortunately, the Edge browser available to the vast majority of Windows 10 users is a sub-par experience as it lacks basic features like extensions. This is a big milestone for Google as their browser faced and uphill battle against Internet Explorer when it was introduced back in 2008.Also read: Windows Desktop Market Share Drops Below 90%

    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