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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
Attitude is half reality.
    --- me?
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 :-)

  • Facebook Inches Toward More Transparency and Accountability
    2018-04-26T22:42:00+00:00
    An anonymous reader quotes a report from the Electronic Frontier Foundation: Facebook took a step toward greater accountability this week, expanding the text of its community standards and announcing the rollout of a new system of appeals. Digital rights advocates have been pushing the company to be more transparent for nearly a decade, and many welcomed the announcements as a positive move for the social media giant. The changes are certainly a step in the right direction. Over the past year, following a series of controversial decisions about user expression, the company has begun to offer more transparency around its content policies and moderation practices, such as the "Hard Questions" series of blog posts offering insight into how the company makes decisions about different types of speech. The expanded community standards released on Tuesday offer a much greater level of detail of what's verboten and why. Broken down into six overarching categories -- violence and criminal behavior, safety, objectionable content, integrity and authenticity, respecting intellectual property, and content-related requests -- each section comes with a "policy rationale" and bulleted lists of "do not post" items. Facebook's other announcement -- that of expanded appeals -- has received less media attention, but for many users, it's a vital development. In the platform's early days, content moderation decisions were final and could not be appealed. Then, in 2011, Facebook instituted a process through which users whose accounts had been suspended could apply to regain access. That process remained in place until this week.

    Read more of this story at Slashdot.

  • CEO Doesn't Know if MoviePass Will Offer a Movie Per Day Plan Again
    2018-04-26T22:05:00+00:00
    The subscription service famous for supplying a movie ticket per day for just $9.95 a month hasn't been offering that wildly popular package since April 13. From a report: The company's too-good-to-be-true offer of one movie per day for $10 subscription model brought it 500,000 subscribers in one month, but MoviePass' finances show that the startup is struggling while still being dogged by its CEO's comments around tracking his customers. Recently, the company downgraded its available new subscriber plans to a three-month, $30 "limited time" offer that includes four movies per month and a three-month trial of iHeartRadio premium. It seems as if this offer now has no limit; CEO Mitch Lowe told The Hollywood Reporter that he was unsure if the movie-per-day plan would even return as an option. "Do you think you will go back to a movie a day?" a THR reporter asked Lowe at CinemaCon in Las Vegas. "I don't know," he responded.

    Read more of this story at Slashdot.

  • Ski Lift In Austria Left Control Panel Open On the Internet
    2018-04-26T21:25:00+00:00
    An anonymous reader writes: Officials from the city of Innsbruck in Austria have shut down a local ski lift after two security researchers found its control panel open wide on the Internet, and allowing anyone to take control of the ski lift's operational settings. There was no authentication in place, and anyone accessing the control panel could have modified the ski lift's speed, the distance between cable cars, and cable tension. Coincidentally, researchers discovered the ski lift's control panel on the same day that NBC ran a report about a ski lift system suffering a mechanical malfunction, going at crazy speeds, and injuring 10 people. Both ski lifts were from the same vendor, but researchers say they weren't aware of the NBC report when they stumbled upon the one in Austria. Innsbruck officials shut down the ski lift for a security audit, and the ski lift is still nonoperational today.

    Read more of this story at Slashdot.

  • Jeff Bezos Says He Liquidates a $1 Billion of Amazon Stock Every Year To Pay For His Rocket Company Blue Origin
    2018-04-26T20:45:00+00:00
    Amazon CEO Jeff Bezos spends a tiny fraction of his net worth to fund Blue Origin, the aerospace company he started in 2000. From a report: For a man worth $127 billion, that tiny fraction amounts to $1 billion a year, which he gets by liquidating Amazon stock, Bezos said at an Axel Springer awards event in Berlin, Germany, hosted by Business Insider's US editor-in-chief, Alyson Shontell. "The only way I can see to deploy this much financial resource is by converting my Amazon winnings into space travel," he said in an interview with Axel Springer CEO Mathias Dopfner. "Blue Origin is expensive enough to be able to use that fortune." Bezos said he planned to continue funding the company through that annual tradition long into the future. Bezos famously has numerous projects. He runs Amazon, owns The Washington Post, and is working on turning a mansion in Washington, DC, into a single-family home, to name a few. None of these, he said, are as relevant or as worthy of his money as Blue Origin, which he called "the most important work I'm doing."

    Read more of this story at Slashdot.

  • New C# Ransomware Compiles Itself at Runtime
    2018-04-26T20:05:00+00:00
    From a report: A new in-development ransomware was discovered that has an interesting characteristic. Instead of the distributed executable performing the ransomware functionality, the executables compiles an embedded encrypted C# program at runtime and launches it directly into memory.

    Read more of this story at Slashdot.

  • The Smartphone Sales Slowdown is Real
    2018-04-26T19:25:00+00:00
    Earnings reports from Samsung and Qualcomm on Wednesday suggest a serious industrywide slowdown in smartphone sales. Samsung's report is especially telling, since it also makes displays and other components for Apple. From a report: The smartphone business is an incredibly crowded space, so a slowdown could lead to even steeper price competition. That's a potential short-term boon for consumers, but could put the hurt on a whole host of technology companies. Samsung's take: Its written outlook was terse and brief, but damning. Of its own phones, it said "[p]rofitability in the mobile business is expected to decline quarter-over-quarter due to stagnant sales of flagship models amid weak demand and an increase in marketing expenses to address the situation." Similarly, it cautioned of weak demand in its display and chip businesses, which supply components for both Samsung and its phone rivals, including Apple. Qualcomm's take: The phone chip giant also predicted a slowdown, cutting its forecast for 3G and 4G smartphones.

    Read more of this story at Slashdot.

  • Fake Mark Zuckerbergs Scam Facebook Users Out of Their Cash
    2018-04-26T18:45:00+00:00
    Hundreds of Facebook and Instagram accounts have been parading as Facebook CEO Mark Zuckerberg and COO Sheryl Sandberg, tricking vulnerable individuals into sending large amounts of money in order to collect bogus lottery winnings, the New York Times reports [Editor's note: the link may be paywalled]. From a report: An examination by The New York Times found 205 accounts impersonating Mr. Zuckerberg and Ms. Sandberg on Facebook and its photo-sharing site Instagram, not including fan pages or satire accounts, which are permitted under the company's rules. At least 51 of the impostor accounts, including 43 on Instagram, were lottery scams like the one that fooled Mr. Bernhardt. The fake Zuckerbergs and faux Sandbergs have proliferated on Facebook and Instagram, despite the presence of Facebook groups that track the scams and complaints about the trick dating to at least 2010. A day after The Times informed Facebook of its findings, the company removed all 96 impostor Mark Zuckerberg and Sheryl Sandberg accounts on its Facebook site. It had left up all but one of the 109 fakes on Instagram, but removed them after this article was published.

    Read more of this story at Slashdot.

  • Robot-Launched Weather Balloons in Alaska Hasten Demise of Remote Stations
    2018-04-26T18:05:00+00:00
    The National Weather Service is choosing automated launchers over human employees to deploy weather balloons in Alaska. From a report: Last Thursday, just before 3 p.m., things began stirring inside the truck-size box that sat among melting piles of snow at the airport in Fairbanks, Alaska. Inside, software ran checks on instruments to measure atmospheric temperature, humidity, and pressure; a tray slid into place; and a nozzle began filling a large balloon with gas. Finally, the roof of the box yawned open and a weather balloon took off into the sunny afternoon, instruments dangling. The entire launch was triggered with the touch of a button, 5 kilometers away at an office of the National Weather Service (NWS). The flight was smooth, just one of hundreds of twice-daily balloon launches around the world that radio back crucial data for weather forecasts. But most of those balloons are launched by people; the robotic launchers, which are rolling out across Alaska, are proving to be controversial. NWS says the autolaunchers will save money and free up staff to work on more pressing matters. But representatives of the employee union question their reliability, and say they will hasten the end of Alaska's remote weather offices, where forecasting duties and hours have already been slashed. "The autolauncher is just another nail in their coffin," says Kimberly Vaughan, a union steward in Juneau. Once deployed across the state, the $1.2 million machines, built by Finnish company Vaisala, will save about 8 hours of forecaster time a day -- and about $1 million a year at NWS, Susan Buchanan, an NWS spokesperson says.

    Read more of this story at Slashdot.

  • High-Paying Trade Jobs Sit Empty, While High School Grads Line Up For University
    2018-04-26T17:25:00+00:00
    An anonymous reader shares an NPR report: While a shortage of workers is pushing wages higher in the skilled trades, the financial return from a bachelor's degree is softening, even as the price -- and the average debt into which it plunges students -- keeps going up. But high school graduates have been so effectively encouraged to get a bachelor's that high-paid jobs requiring shorter and less expensive training are going unfilled. This affects those students and also poses a real threat to the economy. "Parents want success for their kids," said Mike Clifton, who teaches machining at the Lake Washington Institute of Technology, about 20 miles from Seattle. "They get stuck on [four-year bachelor's degrees], and they're not seeing the shortage there is in tradespeople until they hire a plumber and have to write a check." In a new report, the Washington State Auditor found that good jobs in the skilled trades are going begging because students are being almost universally steered to bachelor's degrees. Among other things, the Washington auditor recommended that career guidance -- including choices that require less than four years in college -- start as early as the seventh grade. "There is an emphasis on the four-year university track" in high schools, said Chris Cortines, who co-authored the report. Yet, nationwide, three out of 10 high school grads who go to four-year public universities haven't earned degrees within six years, according to the National Student Clearinghouse. At four-year private colleges, that number is more than 1 in 5.

    Read more of this story at Slashdot.

  • Ubuntu 18.04 Focuses On Security and AI Improvements
    2018-04-26T16:45:00+00:00
    Canonical has announced the release of its open-source Linux operating system, Ubuntu 18.04, which features security, multi-cloud, containers, and AI improvements. From a report: "Multi-cloud operations are the new normal," said Mark Shuttleworth, CEO of Canonical and founder of Ubuntu, in a statement. "Boot-time and performance-optimized images of Ubuntu 18.04 LTS on every major public cloud make it the fastest and most efficient OS for cloud computing, especially for storage and compute intensive tasks like machine learning." On-premises and on-cloud AI development within Ubuntu will be improved by the integration of Kubeflow and a range of CI/CD tools into Canonical Kubernetes. Kubeflow is a machine learning library built on Kubernetes.

    Read more of this story at Slashdot.

  • As More Users Complain About Poor Keyboard in Current MacBook Pro Lineup, Critics Say Apple Should Consider Recalling the Device
    2018-04-26T16:05:00+00:00
    Last year, a report outlining what it described as a major flaw in Apple's current MacBook Pro lineup became a talking point in the industry. The issue was that a piece of dust could render keys on the MacBook Pro lineup useless, and that Apple had no idea how to fix it. Casey Johnston, writing for The Outline: MacBook Pro's keyboard keys stopped working if a single piece of dust slipped under there, and more importantly, that neither Apple nor its Geniuses would acknowledge that this was actually a problem. Today, Best Buy announced it is having a significant sale on these computers, marking them hundreds of dollars off. Interesting. Still, I'd suggest you do not buy them. Since I wrote about my experience, many have asked me what happened with the new top half of the computer that the Apple Geniuses installed, with its pristine keyboard and maybe-different key switches. The answer is that after a couple of months, I started to get temporarily dead keys for seemingly no reason. Again. Longtime widely respected commentator Jason Snell says, "I know that we Apple-watchers sit around wondering if Apple will release new laptops with new keyboards that don't have these issues, but Apple's relative silence on this issue for existing customers is deafening. If these problems are remotely as common as they seem to be, this is an altogether defective product that should be recalled."

    Read more of this story at Slashdot.

  • Researchers Are Keeping Pig Brains Alive Outside the Body
    2018-04-26T15:36:00+00:00
    In a step that could change the definition of death, researchers have restored circulation to the brains of decapitated pigs and kept the reanimated organs alive for as long as 36 hours. From a report: The feat offers scientists a new way to study intact brains in the lab in stunning detail. But it also inaugurates a bizarre new possibility in life extension, should human brains ever be kept on life support outside the body. The work was described on March 28 at a meeting held at the National Institutes of Health to investigate ethical issues arising as US neuroscience centers explore the limits of brain science. During the event, Yale University neuroscientist Nenad Sestan disclosed that a team he leads had experimented on between 100 and 200 pig brains obtained from a slaughterhouse, restoring their circulation using a system of pumps, heaters, and bags of artificial blood warmed to body temperature.

    Read more of this story at Slashdot.

  • Google Joins Apple in Condemning the Repeal of the Clean Power Plan
    2018-04-26T14:54:00+00:00
    An anonymous reader shares a report: Google filed a public comment today criticizing the Environmental Protection Agency's proposal to roll back the Clean Power Plan, an Obama-era policy that aims to cut power plant pollution. With its comment, Google joins Apple in arguing that keeping the policy is a good deal for the US. Google's comment, which it shared with The Verge, lays out what it called a strong economic case for the Clean Power Plan.It says that the plan would encourage utilities and companies like Google to keep investing in renewable energy -- which Google says is getting cheaper, is desired by both consumers and investors, and is a good source of jobs.

    Read more of this story at Slashdot.

  • Snapchat Takes a Second Try at Spectacles
    2018-04-26T14:00:00+00:00
    Snapchat is launching an updated version of Spectacles, its glasses with an embedded camera, and says its first version of the smart glasses sold over 220,000 units. From a report: That first version also caused the company to take a nearly $40 million write-down in the third quarter due to excess inventory. But instead of scrapping its hardware unit, the company is pressing ahead. Snap "listened to our customers and our community and incorporated every part of their feedback," said Mark Randall, Snapchat's vice president of hardware. The new version costs $150 -- $20 more than the prior version. They come in three new colors (onyx, ruby, and sapphire), are water resistant and can take photos and videos in high definition. Plus the content transfers much faster.

    Read more of this story at Slashdot.

  • A Well-Known Expert On Student Loans Is Not Real
    2018-04-26T13:00:00+00:00
    mi shares a report from The Chronicle of Higher Education: Drew Cloud is everywhere. The self-described journalist who specializes in student-loan debt has been quoted in major news outlets, including The Washington Post, The Boston Globe, and CNBC, and is a fixture in the smaller, specialized blogosphere of student debt. But he's a fiction, and "his" site -- an invention of a student-loan refinancing company. "Drew Cloud is a pseudonym that a diverse group of authors at Student Loan Report, LLC use to share experiences and information related to the challenges college students face with funding their education," wrote Nate Matherson, CEO of LendEDU (the company that owns Cloud's website, The Student Loan Report). Before that admission, however, Cloud had corresponded at length with many journalists, pitching them stories and offering email interviews, many of which were published. When The Chronicle attempted to contact him through the address last week, Cloud said he was traveling and had limited access to his account. He didn't respond to additional inquiries. And on Monday, as The Chronicle continued to seek comment, Cloud suddenly evaporated. His once-prominent placement on The Student Loan Report had been removed. His bylines were replaced with "SLR Editor." Matherson confirmed on Tuesday that Cloud was an invention. Pressed on whether he regretted deceiving news organizations with a fake source, Matherson said Cloud "was created as a way to connect with our readers (ex. people struggling to repay student debt) and give us the technical ability to post content to the Wordpress website."

    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