miércoles, 26 de marzo de 2014

[1312.6660] A neuronal device for the control of multi-step computations

[1312.6660] A neuronal device for the control of multi-step computations:



 "We describe the operation of a neuronal device which embodies the computational principles of the `paper-and-pencil' machine envisioned by Alan Turing. The network is based on principles of cortical organization. We develop a plausible solution to implement pointers and investigate how neuronal circuits may instantiate the basic operations involved in assigning a value to a variable (i.e., x=5), in determining whether two variables have the same value and in retrieving the value of a given variable to be accessible to other nodes of the network. We exemplify the collective function of the network in simplified arithmetic and problem solving (blocks-world) tasks."



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domingo, 12 de enero de 2014

If I Had a Hammer

MY favorite story in Erik Brynjolfsson and Andrew McAfee’s fascinating new book, “The Second Machine Age,” is when the Dutch chess grandmaster Jan Hein Donner was asked how he’d prepare for a chess match against a computer, like I.B.M.’s Deep Blue. Donner replied: “I would bring a hammer.”
Donner isn’t alone in fantasizing that he’d like to smash some recent advances in software and automation — think self-driving cars, robotic factories and artificially intelligent reservationists — which are not only replacing blue-collar jobs at a faster rate, but now also white-collar skills, even grandmasters!
Something very, very big happened over the last decade. It is being felt in every job, factory and school. My own shorthand is that the world went from “connected to hyperconnected” and, as a result, average is over, because employers now have so much easier, cheaper access to above-average software, automation and cheap genius from abroad. Brynjolfsson and McAfee, both at M.I.T., offer a more detailed explanation: We are at the start of  the Second Machine Age.
The First Machine Age, they argue, was the Industrial Revolution that was born along with the steam engine in the late 1700s. This period was “all about power systems to augment human muscle,” explained McAfee in an interview, “and each successive invention in that age delivered more and more power. But they all required humans to make decisions about them.” Therefore, the inventions of this era actually made human control and labor “more valuable and important.” Labor and machines were complementary.
 In the Second Machine Age, though, argues Brynjolfsson, “we are beginning to automate a lot more cognitive tasks, a lot more of the control systems that determine what to use that power for. In many cases today artificially intelligent machines can make better decisions than humans.” So humans and software-driven machines may increasingly be substitutes, not complements. What’s making this possible, the authors argue, are three huge technological advances that just reached their tipping points, advances they describe as “exponential, digital and combinatorial.”
To illustrate “exponential” they retell the story of the king who was so impressed with the man who invented chess that he offered him any reward. The inventor suggested rice to feed his family. He asked the king to simply place a grain of rice on the first square of a chessboard and then have each subsequent square receive twice as many grains as the previous. The emperor agreed until he realized that 63 instances of doubling yields a fantastically big number, even starting with one grain — like 18 quintillion grains of rice, once you finish the second half of the chess board.
The authors compare this second half of the chessboard to Moore’s Law about the relentless doubling of digital computing power about every two years. Unlike the steam engine, which was physical and doubled in performance every 70 years, computers “get better, faster than anything else, ever,” says Brynjolfsson. Now that we’re in the second half of the digital chessboard, you see cars that drive themselves in traffic, Jeopardy-champion supercomputers, flexible factory robots and pocket smartphones that are the equivalent of a supercomputer of just a generation ago.

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Now add the spread of the Internet to both people and things — soon everyone on the planet will have a smartphone, and every cash register, airplane engine, student iPad and thermostat will be broadcasting digital data via the Internet. All this data means we can instantly discover and analyze patterns, instantly replicate what is working on a global scale and instantly improve what isn’t working — whether it is eye surgery techniques, teaching fractions or how best to operate a G.E. engine at 30,000 feet. Suddenly, the speed and slope of improvement, they argue, gets very fast and steep.
Combinatorial advances mean you can take Google Maps and combine them with a smartphone app like Waze, through which drivers automatically transmit traffic conditions on their routes by just carrying their phone in their car, and meld both into a GPS system that not only tells you what the best route is to your destination but what the best route now is because it also sees all the traffic everywhere. Instantly, you’re the smartest driver in town.
 Put all these advances together, say the authors, and you can see that our generation will have more power to improve (or destroy) the world than any before, relying on fewer people and more technology. But it also means that we need to rethink deeply our social contracts, because labor is so important to a person’s identity and dignity and to societal stability. They suggest that we consider lowering taxes on human labor to make it cheaper relative to digital labor, that we reinvent education so more people can “race with machines” not against them, that we do much more to foster the entrepreneurship that invents new industries and jobs, and even consider guaranteeing every American a basic income. We’ve got a lot of rethinking to do, they argue, because we’re not only in a recession-induced employment slump. We’re in technological hurricane reshaping the workplace — and it just keeps doubling.

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domingo, 8 de diciembre de 2013

Can't We Do Better?

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THE latest results in the Program for International Student Assessment, or PISA, which compare how well 15-year-olds in 65 cities and countries can apply math, science and reading skills to solve real-world problems were released last week, and it wasn’t pretty for the home team. Andreas Schleicher, who manages PISA, told the Department of Education: “Three years ago, I came here with a special report benchmarking the U.S. against some of the best performing and rapidly improving education systems. Most of them have pulled further ahead, whether it is Brazil that advanced from the bottom, Germany and Poland that moved from adequate to good, or Shanghai and Singapore that moved from good to great. The math results of top-performer Shanghai are now two-and-a-half school years ahead even of those in Massachusetts — itself a leader within the U.S.”
Josh Haner/The New York Times
Thomas L. Friedman

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Not good. We’re now in an era in which globalization and the information technology revolution have merged to drastically shrink what was the basis of our middle class for so many years: the “high-wage, middle-skilled” job. In a less integrated and less automated world of walls, where unions held more sway, many Americans could live an average middle-class lifestyle with average skills. In today’s hyperconnected world without walls — when more Indians, Chinese, computers, robots and software can perform more average blue-collar and white-collar jobs — the only high-wage jobs are increasingly high-skill jobs. “Over the last decade, job growth in the industrialized world has almost exclusively been at the top end of the PISA skill distribution,” explained Schleicher, “while routine cognitive skills, the kinds of things that are easy to teach but also easy to digitize and outsource, have seen the steepest decline in demand.”
President Obama noted last week that this is one reason that the top 10 percent in America now takes home half of our national income, up from a third in 1979. One response is to raise the minimum wage and provide national health care. I hope both work, but neither will solve the problem. “Since the link between skills, jobs and growth is becoming ever tighter, it will be harder and harder for governments to address inequalities through redistribution,” argues Schleicher.
To his credit, Obama has also been calling for more investment in preschool, tech-ed and affordable colleges, but Republicans will only talk about tax cuts. Tax cuts alone won’t cut it either. Our kids face three big adjustments. First, to be in the middle class, they will need to be constantly improving their skills over their lifetime. Second, to do that, they will need a lot more self-motivation. The “digital divide” will soon disappear. Fairly soon, virtually everyone will have a screen and an Internet connection. In that world, argues futurist Marina Gorbis, the big divide will be “the motivational divide” — who has the self-motivation, grit and persistence to take advantage of all the free or cheap online tools to create, collaborate and learn. And third, countries that thrive the most will be the H.I.E.’s — the high imagination-enabling countries — that attract and enable talent to be constantly spinning off new ideas and start-ups, the source of most new good jobs.
So now let’s look at the latest PISA. It found that the most successful students are those who feel real “ownership” of their education. In all the best performing school systems, said Schleicher, “students feel they personally can make a difference in their own outcomes and that education will make a difference for their future.” The PISA research, said Schleicher, also shows that “students whose parents have high expectations for them tend to have more perseverance, greater intrinsic motivation to learn.” The highest performing PISA schools, he added, all have “ownership” cultures — a high degree of professional autonomy for teachers in the classrooms, where teachers get to participate in shaping standards and curriculum and have ample time for continuous professional development. So teaching is not treated as an industry where teachers just spew out and implement the ideas of others, but rather is “a profession where teachers have ownership of their practice and standards, and hold each other accountable,” said Schleicher.
We’re going through a huge technological transformation in the middle of a recession. It requires a systemic response. Democrats who protect teachers’ unions that block reforms to give teachers more ownership and accountability, and who refuse to address long-term entitlement spending that threatens to deprive us of funds to invest in the young, are harming our future. Republicans who block investments in things like early education and immigration reform — today we educate the world’s top talent in our colleges and then send them back to their home countries — are harming our future.
Conservatives need to think differently about the near-term safety nets we need to ease some people through this period, and liberals need to think more seriously about how we incentivize and unleash risk-takers to start new companies that create growth, wealth and good jobs. To have more employees, we need more employers. Just redividing a slow-growing pie will not sustain the American dream.

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domingo, 3 de noviembre de 2013

Innovation Imperative: Change Everything

Online Education as an Agent of Transformation

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WHEN the first commercially successful steamship traveled the Hudson River in 1807, it didn’t appear to be much of a competitive threat to transoceanic sailing ships. It was more expensive, less reliable and couldn’t travel very far. Sailors dismissed the idea that steam technology could ever measure up — the vast reach of the Atlantic Ocean surely demanded sails. And so steam power gained its foothold as a “disruptive innovation” in inland waterways, where the ability to move against the wind, or when there was no wind at all, was important.
Tony Cenicola/The New York Times

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In 1819, the technology vastly improved, the S.S. Savannah made the first Atlantic crossing powered by steam and sail (in truth, only 80 of the 633-hour voyage was by steam). Sailing ship companies didn’t completely ignore the advancement. They built hybrid ships, adding steam engines to their sailing vessels, but never entered the pure steamship market. Ultimately, they paid the price for this decision. By the early 1900s, with steam able to power a ship across the ocean on its own, and do so faster than the wind, customers migrated to steamships. Every single transoceanic sailing-ship company went out of business.
Traditional colleges are currently on their hybrid voyage across the ocean.
Like steam, online education is a disruptive innovation — one that introduces more convenient and affordable products or services that over time transform sectors. Yet many bricks-and-mortar colleges are making the same mistake as the once-dominant tall ships: they offer online courses but are not changing the existing model. They are not saving students time and money, the essential steps to disruption. And though their approach makes sense in the short term, it leaves them vulnerable as students gravitate toward less expensive colleges.
For-profit universities latched on early to online learning, rough as it was in the 1990s. The target, as with all disruptive innovations, was customers who wouldn’t otherwise consume their product — in this case, working adults for whom traditional higher education was inconvenient. In theory, for-profit companies should have shaken up the higher education landscape. But federal financial aid seems to have gummed up the disruption: the easy revenue has encouraged some schools to indiscriminately enroll, often at the expense of quality, and has discouraged cost reduction.
Still, the theory predicts that, be it steam or online education, existing consumers will ultimately adopt the disruption, and a host of struggling colleges and universities — the bottom 25 percent of every tier, we predict — will disappear or merge in the next 10 to 15 years. Already traditional universities are showing the strains of a broken business model, reflecting demand and pricing pressures previously unheard-of in higher education. One example: Needing a cash infusion, Thunderbird School of Global Management in July announced a merger with Laureate Education Inc., an online pioneer.
Even the venerable Harvard Business School has ceded ground to online instruction. Before starting school, students are directed to learning modules on the web that cover entry-level accounting concepts. With the basic competencies covered, classes spend more time on higher-order discussion, and more deeply explore real-world applications. Harvard Business School is also developing a series of “pre-M.B.A. and post-M.B.A.” online courses that it plans to have ready by summer. It calls the initiative HBX.
Meanwhile, many universities have jumped on the MOOC bandwagon, creating a hodgepodge of these massive open online courses for public consumption. But for MOOCs to really fulfill their disruptive potential, they must be built into low-cost programs with certification of skills of value to employers. So far, only a few traditional universities have incorporated MOOCs into their curriculum, and only to supplement what they are already doing — like “flipping the classroom,” with lectures watched from home.
MITx is trying to add structure to the MOOC free-for-all by rolling out a sequence of computer science foundational courses this fall, and the MOOC provider Coursera has just started the Wharton M.B.A. Foundation Series. But perhaps the most promising experiment is from the Georgia Institute of Technology, which next year will start offering a $6,600 online master’s degree, a sixth the price of its current degree, in partnership with the MOOC platform Udacity and AT&T Georgia Tech is putting its reputation behind a MOOC credential.
The lessons from any number of industries teach us that those that truly innovate — fundamentally transforming the model, instead of just incorporating the technology into established methods of operation ­ — will have the final say. So it’s no wonder that observers of this phenomenon ask if online learning portends the end of the residential collegiate experience — the opportunity for students to live, socialize and learn together.
The experience that so many of us remember fondly — those bridge years from childhood to functioning adult — is already one that only a minority of students enjoys. According to the Census Bureau, just 30 percent of all beginning students live on a college campus. But it’s unlikely that the residential experience will disappear. Counterintuitive as it may seem, online instruction may mean even more students benefit from the collegial spirit, though one that looks quite different from the residential experience of today.
Right now, some students who want to live on campus find it prohibitively expensive; some who would rather commute live too far away to do so. As online learning evolves, students should be able to customize their experience with what they need and can afford. This kind of unbundling has occurred in countless industries.
Consider personal computers. Nascent technologies always underserve their customers. As they mature, the opposite happens: they overserve, with bells and whistles customers are less willing to pay for. In the beginning, computer components were unpredictable and not standardized, and each company had to build every one of its parts. As the ways in which the components fit together became better understood, companies like Dell could quickly and affordably customize a computer. A customer ordering a Dell in the 1990s specified the amount of memory wanted and type of Seagate drive and Intel processor. Dell simply snapped the modules together and shipped out a computer within 48 hours.
The Minerva Project, a start-up headquartered in San Francisco that aims to provide an affordable liberal arts education, offers clues as to how this might unfold in higher education. Minerva anticipates that most of its students will be from outside the United States. To serve them, it will enlist operators to create mini-campuses around the globe where clusters of its students will live and socialize together in residence halls, as well as take online courses and work together on projects.
With this unbundling, many more students should have the ability to create aspects of a residential experience for themselves. Some students might take courses online and then, to develop their skills, attend learning spaces like Dev Bootcamp in Chicago and San Francisco, or one of General Assembly’s eight locations around the world. Others may just value the flexibility and convenience of a total online learning experience.
As concepts and skills are taught more effectively online, it’s unlikely that face-to-face interaction will cease to matter. Instead, students will be able to arrange for such experiences when it suits the job they need to get done. Given the reality that we all have different learning needs at different times, that’s a far more student-centered experience. It may not benefit some colleges but should create more options for all students.
Clayton M. Christensen is a professor of business administration at Harvard. Michael B. Horn is executive director for education at the Clayton Christensen Institute for Disruptive Innovation. They are co-authors of “Disrupting Class: How Disruptive Innovation Will Change the Way the World Learns.”

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martes, 22 de octubre de 2013

The Shanghai Secret

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SHANGHAI — Whenever I visit China, I am struck by the sharply divergent predictions of its future one hears. Lately, a number of global investors have been “shorting” China, betting that someday soon its powerful economic engine will sputter, as the real estate boom here turns to a bust. Frankly, if I were shorting China today, it would not be because of the real estate bubble, but because of the pollution bubble that is increasingly enveloping some of its biggest cities. Optimists take another view: that, buckle in, China is just getting started, and that what we’re now about to see is the payoff from China’s 30 years of investment in infrastructure and education. I’m not a gambler, so I’ll just watch this from the sidelines. But if you’re looking for evidence as to why the optimistic bet isn’t totally crazy, you might want to visit a Shanghai elementary school.
Josh Haner/The New York Times
Thomas L. Friedman
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I’ve traveled here with Wendy Kopp, the founder of Teach for America, and the leaders of the Teach for All programs modeled on Teach for America that are operating in 32 countries. We’re visiting some of the highest- and lowest-performing schools in China to try to uncover The Secret — how is it that Shanghai’s public secondary schools topped the world charts in the 2009 PISA (Program for International Student Assessment) exams that measure the ability of 15-year-olds in 65 countries to apply what they’ve learned in math, science and reading.
After visiting Shanghai’s Qiangwei Primary School, with 754 students — grades one through five — and 59 teachers, I think I found The Secret:
There is no secret.
When you sit in on a class here and meet with the principal and teachers, what you find is a relentless focus on all the basics that we know make for high-performing schools but that are difficult to pull off consistently across an entire school system. These are: a deep commitment to teacher training, peer-to-peer learning and constant professional development, a deep involvement of parents in their children’s learning, an insistence by the school’s leadership on the highest standards and a culture that prizes education and respects teachers.
Shanghai’s secret is simply its ability to execute more of these fundamentals in more of its schools more of the time. Take teacher development. Shen Jun, Qiangwei’s principal, who has overseen its transformation in a decade from a low-performing to a high-performing school — even though 40 percent of her students are children of poorly educated migrant workers — says her teachers spend about 70 percent of each week teaching and 30 percent developing teaching skills and lesson planning. That is far higher than in a typical American school.
Teng Jiao, 26, an English teacher here, said school begins at 8:35 a.m. and runs to 4:30 p.m., during which he typically teaches three 35-minute lessons. I sat in on one third-grade English class. The English lesson was meticulously planned, with no time wasted. The rest of his day, he said, is spent on lesson planning, training online or with his team, having other teachers watch his class and tell him how to improve and observing the classrooms of master teachers.
“You see so many teaching techniques that you can apply to your own classroom,” he remarks. Education experts will tell you that of all the things that go into improving a school, nothing — not class size, not technology, not length of the school day — pays off more than giving teachers the time for peer review and constructive feedback, exposure to the best teaching and time to deepen their knowledge of what they’re teaching.
Teng said his job also includes “parent training.” Parents come to the school three to five times a semester to develop computer skills so they can better help their kids with homework and follow lessons online. Christina Bao, 29, who also teaches English, said she tries to chat either by phone or online with the parents of each student two or three times a week to keep them abreast of their child’s progress. “I will talk to them about what the students are doing at school.” She then alluded matter-of-factly to a big cultural difference here, “I tell them not to beat them if they are not doing well.”
In 2003, Shanghai had a very “average” school system, said Andreas Schleicher, who runs the PISA exams. “A decade later, it’s leading the world and has dramatically decreased variability between schools.” He, too, attributes this to the fact that, while in America a majority of a teacher’s time in school is spent teaching, in China’s best schools, a big chunk is spent learning from peers and personal development. As a result, he said, in places like Shanghai, “the system is good at attracting average people and getting enormous productivity out of them,” while also, “getting the best teachers in front of the most difficult classrooms.”
China still has many mediocre schools that need fixing. But the good news is that in just doing the things that American and Chinese educators know work — but doing them systematically and relentlessly — Shanghai has in a decade lifted some of its schools to the global heights in reading, science and math skills. Oh, and Shen Jun, the principal, wanted me to know: “This is just the start.”

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