Tag Archives: networks

New algorithm offers ability to influence systems such as living cells or social networks

MIT and Northeastern University researchers devised a computer algorithm that can generate a controllability structure for any complex network. This structure identifies a small number of nodes in the network which, if controlled, will control the behavior of the entire network.
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Reinventing the Sacred by Stuart Kauffman

My rating: 4 of 5 stars

I have been interested in the work of Stuart Kauffman since I first read about him 10 years ago. I have read his other book “At Home in the Universe” and so wanted to read this one. I find Kauffman very difficult to read, but worth the effort. This time I took notes as I was reading, which helped a great deal. Part of the reason I find him so interesting is that his books are, for me, a view into a mind on the edge of discovering something significant. I’m not sure Kauffman will actually discover whatever it is he is closing in on, but he’s barking up the right tree and its fascinating to watch him wrestle with his problems.

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Economics and the Internet’s Large-Scale Topology

Distribution of the Internet around the world. (Top) Worldwide router density map obtained using NetGeo tool to identify the geographical location of 228,265 routers mapped out by the extensive router level mapping effort of Govindan and Tangmunarunkit. (Bottom) Population density map based on the CIESIN’s population data. Both maps are shown using a box resolution of 1 degree by 1 degree. The bar next to each map gives the range of values encoded by the color code, indicating that the highest population density within this resolution is of the order 10**7 people/box, while the highest router density is of the order of 10**4 routers/box. Note that while in economically developed nations there are visibly strong correlations between population and router density, in the rest of the world Internet access is sparse, limited to urban areas characterized by population density peaks.

This graph and the explanation above are taken from Modeling the Internet’s Large-Scale Topology by Soon-Hyung Yook, Hawoong Jeong, Albert-Laszlo Barabasi. Department of Physics, University of Notre Dame, Notre Dame, IN 46556, USA.

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The Emerging Science of Food Webs

This diagram shows a food web, The nodes are species and the lines show predator-prey relationships between the species. Species at higher trophic levels eat those lower down in the web. This particular food web is for Little Rock Lake in Wisconsin and was produced by Neo D. Martinez of San Francisco State University, Romberg Tiburon Center for Environmental Studies.


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Redrawing the Pentagon’s new Map

In 1999 Ryan McCormack and I wrote a marketing piece on Globalization for Sapient Corporation. Aimed primarily at raising awareness of the issues involved in building global Internet systems it also touched on national market analysis and selection. I was reminded of this diagram showing income and connectivity for every country in the world from that piece while reading various articles on US Foreign Policy recently. These articles included this piece called the Pentagons new Map by Dr Thomas P.M. Barnett a US military Strategist on Globalization and US Foreign Policy and this more >jaundiced view from the Washington Monthly.

Basically I think Dr Barnett is on to something when he claims that “disconnectedness defines danger”.

Show me where globalization is thick with network connectivity, financial transactions, liberal media flows, and collective security, and I will show you regions featuring stable governments, rising standards of living, and more deaths by suicide than murder. These parts of the world I call the Functioning Core, or Core. But show me where globalization is thinning or just plain absent, and I will show you regions plagued by politically repressive regimes, widespread poverty and disease, routine mass murder, and “most important” the chronic conflicts that incubate the next generation of global terrorists. These parts of the world I call the Non-Integrating Gap, or Gap.

Having said I think Dr Barnett is on to something I don’t think his conclusions are correct! He makes three mistakes;

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Internet Cartography – Maps of the World Wide Web and other Cyber Geography

In the Beginning there was one….

This is the first map of The Internet. It shows the first node on the ARPANET at the University California Los Angeles (UCLA) on the 2nd September 1969. The diagram is taken from
Casting the Net: From ARPANET to INTERNET and beyond by Peter H. Salus and was drawn by Alex McKinzie who worked for BBN. Any Travelog needs maps. For a good catalog of Internet cartography checkout The Atlas of Cyberspaces

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