原文地址:第三集 大爷今年八十四
当阿基米德进入知天命之年,阿波罗尼奥斯1还是个不知天高地厚的小伙子。他虽然在数学上表现得才华横溢,但与前者岁数上25年的差距使得他在阿基米德面前还是略显浮躁轻狂。有那么一天,阿波罗尼奥斯向长者炫耀自己已经完全掌握了大数的奥妙,言下之意是从阿基米德这学不到什么东西了。阿基米德听完他的“豪言”以后又好气又好笑,决定弄个题目折腾下这个小兔崽子,于是他说:
啊,朋友,如果你真的智慧过人,那么就来算算群牛的数目吧。它们蒙受太阳神的眷顾,自由的在广袤的西西里平原吃草。按毛色它们被分成4组:白、黑、棕、花,每种牛又分公、母。在公牛中,白牛数多于棕牛数,多出之数相当于全体黑牛数的1/2+1/3;黑牛数多于棕牛数,多出之数相当于全体花牛数的1/4+1/5;花牛数多于棕牛数,多出之数相当于全体白牛数的1/6+1/7;在母牛中,白牛数是全体黑牛数的1/3+1/4;黑牛数是全体花牛数的1/4+1/5;花牛数是全体棕牛数的1/5+1/6;棕牛数是全体白牛数的1/6+1/7。试问这帮牛有多少头?
阿波罗尼奥斯光看完题目就晕菜了。不料阿基米德还觉得太便宜这小子,于是又加了两行代码升级。他心怀不轨的继续打击阿波罗尼奥斯:啊,朋友,你就算解出上述问题,还称不上精通大数。要知道太阳神无所不能,他把白公牛与黑公牛放牧在正方形的牧场,而把花公牛和棕公牛在正三角形草原放牧2。这你要是都搞得定,那你可真是个专家了。
data visualization for the masses: a new real-time monitor that will help cut greenhouse gas emissions & the amount of energy wasted by appliances being left on standby is now proposed to be freely distributed in UK households.
the MorePower device aims to give people more information about their energy consumption by displaying the cost of energy & carbon emissions over time & for each device. "the visual language is designed to let non-expert users quickly & easily understand the messy world of energy-use without becoming boring energy geeks."
will people be truly able to make sense of them?
see also eco-visualization & patterns of energy use & power-aware cord & standby visualization & power socket bar chart & wattson energy display.
[link: moreassociates.com & bbc.co.uk & bbc.co.uk|via engadget.com]
a real-time application that visualizes historical tick data from the TAQ database, an extremely large, multi-dimensional dataset containing every public trade for a specific asset. the application displays second-by-second ticks for multiple assets faster than real-time, as a navigable, fully 3D trading environment.
the X-axis denotes time in seconds, the Y-axis (or the width of the ribbon) is a logarithmic scale of the volume, the Z-axis shows price, while the color of the ribbon represents the tick-by-tick price change.
see also stock market spheres & light sculpture & ticker garden & skirt & money map & planetarium.
[link: lineplot.com & lineplot.com (movie) lineplot.com (thesis PDF)]
Does 60.195.249.163 belong to CERNET "free" IP list? No. 60.195.249.163 不在免费之列. 60.195.249.163 is NOT in free IP list.
《复杂》导读
作者:米歇尔.沃尔德洛普 翻译:陈玲
出版:三联书店
《复杂》这本书的出版可以说给中国的学术界打开了一扇窗子,让我们真正的了解了国外的复杂性科学。有人称《复杂》这本书是复杂性科学的“圣经”我看也一点不为过。《复杂》类似于纪实小说,读起来轻松愉快,然而这也许会让不熟悉的人摸不到头脑,因为单单从每一章的标题根本读不出来这一张所要讲述的主要内容。事实上,《复杂》叙述的学术内容涵盖了经济、生命、计算机、物理、哲学等等多门学科、多个层面。我再次做一个总结,方便大家阅读,并在相应的章节找到自己最想要的东西。
1、爱尔兰的英雄
主要叙述阿瑟(Brian Arthur)的故事,包括他的报酬递增率,以及新经济学上的一些洞见,还有对新古典经济学关于最优化经济人的质疑。当然文中也介绍了他的一些个人经历和科研成果。从这章你会体会到一场革命即将来临,这是一个非常好的复杂科学的切入点。如果你感兴趣的领域是经济学,并同样感受到新古典经济学的不足之处,那么这章一定要看。
2、老师倒戈
主要叙述考温、盖尔曼这些权威的物理学家、诺贝尔奖获得者是如何萌发研究跨学科的想法并筹建圣塔菲研究所的。其中包括了这些专家对自己以前研究方法的质疑,他们称新兴的方法为复杂系统方法。文中还介绍了一些物理学的知识。如果你对物理学感兴趣,建议看这章。
3、造物主的秘密
David Churbuck's recent post imploring bloggers to publish full feeds reminded me that I've been meaning to comment on this for a while. It's a subject I speak on regularly at SES, and some of the recommendations I make are not the same ones you see made on a number of blogs.
First of all, I think the primary justification often given for partial feeds - that it will drive higher clickthroughs back to the publisher's site - is off-base. As people subscribe to feeds, they subscribe to more feeds. And that means they're consuming more content, which means that each click out of the feed reader is taking the reader away from more content. In other words, feed reading is consumption-oriented, not transactionally focused. We've seen no evidence that excerpts on their own drive higher clickthroughs.
Secondly, the reason many larger publishers give for trying to steer traffic back to the site is that they can make money on the site. Guess what? You can monetize feeds as well - giving you the option of deciding where and how you want to monetize your audience, instead of assuming that the feed's sole purpose is to drive traffic back to your site (which is a dubious proposition anyway).
I did an interview on Monday where the podcaster asked me how to make feeds "stickier". What he was actually asking was how to get readers more engaged with feed content: how can feeds be made more interactive? A lot of the thinking behind FeedFlare was that we needed a way to give publishers tools to increase the likelihood that readers would in fact engage. Clicking through to read a copy of the post they just read is unlikely to drive a lot of click activity. But clicking through to read the comments will. Bookmarking the post at del.icio.us will drive further activity, as will voting for the post at Digg. (And in those latter examples, they'll both increase secondary traffic growth, by building awareness of your content at those sites.) In other words, adding opportunities for the readers to do things other than just read a copy of the post goes a long way to increasing the probability that the readers will actually do something.
Too few publishers take advantage of the next logical step: building their own FeedFlare units to direct attention to other parts of the publisher's site. If you publish archives by category, why not give readers the ability to browse more articles like the one they just read by going to the category archive? Promoting an event? Do what the folks at TechPresident are doing and include a link to the event with every post:
That link gets seen by everyone subscribed to the feed, dramatically increasing the visibility of the Personal Democracy Forum event (disclosure: I'm speaking at PdF, and FeedBurner's a sponsor). Creating this FeedFlare takes less than five minutes, and it's then something you can share with anyone else who wants to support the event. (I won't go into all the variations here, but creating FeedFlares for fundraising, micro-sites for a specific function, etc., all make a ton of sense. You get the idea.) At this point, the feed is not just a way of distributing content, but is equally about driving awareness and delivering actions - just not all focused exclusively on the individual post.
There's another angle to publishing full feeds that doesn't get a lot of attention: the value of links contained in the posts themselves. Sites like TechMeme do a great job of finding links between blog posts and giving heavily-linked posts more visibility. Aggregators can (but often don't) use these links in interesting ways. Three years ago, I wrote about my favorite feature of my preferred aggregator at the time (SharpReader) - threaded RSS. I would absolutely love to see this feature implemented in Google Reader, where I could navigate through my subscriptions by seeing what links the posts had in common... it would add tremendous value to the interface, and expose connections between posts that are otherwise all but impossible to glean from casual browsing.
FeedDemon fans will be happy to see that Nick Bradbury has added a pretty slick feature to the latest FeedDemon beta called "Popular Topics". Here's a screen shot from FeedDemon 2.5, showing one of the most-linked-to posts across my 200 subscriptions:
In addition, FeedDemon also shows you the most linked-to posts across the NewsGator Online user base, which is a great way to leverage the NewsGator community to surface interesting content you might not otherwise see.
My personal wishlist aside, the value of the full post is that it exposes the links between the posts in the feed and other posts out on the web. These links are sometimes (and, I predict, increasingly will be) leveraged by other services and applications, which can generate additional exposure for your content. Which is sort of why you're publishing a feed in the first place, right?
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