US Military Scientists Solve the Fundamental Problem of Viral Marketing
Viral messages begin life by infecting a few individuals and then start to spread across a network. The most infectious end up contaminating more or less everybody. Just how and why this happens is the subject of much study and debate. Network scientists know that key factors are the rate at which people become infected, the “connectedness” of the network and how the seed group of individuals, who first become infected, are linked to the rest. It is this seed group that fascinates everybody from marketers wanting to sell Viagra to epidemiologists wanting to study the spread of HIV. So a way of finding seed groups in a given social network would surely be a useful trick, not to mention a valuable one. These guys have found a way to identify a seed group that, when infected, can spread a message across an entire network. Their method is relatively straightforward. This process finishes when there is nobody left in the network who has more friends than the threshold. Expect to hear more!
ReseauPetri2
Réseaux de Petri Compléments Blocage Pré et post conditions Merci de corriger la figure ci-dessus en mettant la colonne t1 de la matrice des postconditions à 0. Remarque pertinente de Sébastien Faucou : ce RDP est impur (i.e. que pour p3 on a un arc vers et un arc venant de t2). Réseaux de Petri colorés Exclusion mutuelle, équité faible et équité forte H. Bibliographie, Vidal-Naquet, Choquet-Genier, Réseaux de Petri et systèmes parallèles, Armand Colin, 1992 Retour page précédente
Arduino Laser Engraver
When I originally designed the machine, I only wanted it to engrave regular bitmap picture files. So, I made three separate programs, which when used together, allow normal bitmap pictures to be engraved onto wood. C# Program (Generates "instruction" text file) This accepts a bitmap file and outputs a text file, containing "instruction characters". The bitmap type it accepts is a 24-bit bitmap, with only black and white pixels (no greys / colours). This program works well for smaller images (eg less than 1000 x 700), but gets bogged down with larger images that have lots of burnt pixels (can take over 10 minutes to generate the instruction file). The way that this program scans the image carries over directly to the way the machine engraves the image. Sample Comma Separated Instruction Blocks (to see what the numbers mean, scroll down to the Arduino sketch section): The executable is at the bottom of the page Processing IDE Sketch (Streams instruction data)
TeacherTube - Teach the World
Filter bubble
Intellectual isolation involving search engines The term filter bubble was coined by internet activist Eli Pariser, circa 2010. A filter bubble or ideological frame is a state of intellectual isolation[1] that can result from personalized searches when a website algorithm selectively guesses what information a user would like to see based on information about the user, such as location, past click-behavior, and search history.[2] As a result, users become separated from information that disagrees with their viewpoints, effectively isolating them in their own cultural or ideological bubbles.[3] The choices made by these algorithms are only sometimes transparent.[4] Prime examples include Google Personalized Search results and Facebook's personalized news-stream. Technology such as social media “lets you go off with like-minded people, so you're not mixing and sharing and understanding other points of view ... Concept[edit] Many people are unaware that filter bubbles even exist. [edit]
The Global Brain Institute
The GBI uses scientific methods to better understand the global evolution towards ever-stronger connectivity between people, software and machines. By developing concrete models of this development, we can anticipate both its promises and its perils. That would help us to steer a course towards the best possible outcome for humanity. Objectives (for more details, check our strategic objectives and activities) Assumptions We see people, machines and software systems as agents that communicate via a complex network of communication links. Challenges that cannot be fully resolved by a single agent are propagated to other agents, along the links in the network. The propagation of challenges across the global network is a complex process of self-organization.
Pearltrees Radically Redesigns Its Online Curation Service To Reach A Wider Audience
Pearltrees, the Paris-based online curation service that launched in late 2009, was always known for its rather quirky Flash-based interface that allowed you to organize web bookmarks, photos, text snippets and documents into a mindmap-like structure. For users who got that metaphor, it was a very powerful service, but its interface also presented a barrier to entry for new users. Today, the company is launching a radical redesign that does away with most of the old baggage of Pearltrees 1.0. Here is what Pearltrees 1.0 looked like: And here is the new version: Pearltrees’ mission is still to allow you to organize everything you want on the service (in that respect, it almost competes with Evernote). As Pearltrees CEO Patrice Lamothe stressed when I talked to him last week, all of the existing content the company’s over 2 million contributors have added in the past simply transfer over to the new site. 3. The new grid definitely does away with many of the problems of the early version.
Raspberry Pi Multi-Room Audio (Mobile/Tablet/PC Controlled)
I have been lurking on Instructables for a few years but have never posted one myself. Now I have bought a home of my own it's time to undergo some projects and share them with the community. In my first project I'm going to show you how I setup multi-room audio that can be controlled by any device with a web browser or an app on your Android and/or iOS device. I apologise for the lack of/poor quality photos. I have borrowed some of this information and thrown in some things from my own experience. Equipment you will need • Computer (mac/win/linux to act as your Logitech Media Server) • Home network (wireless if you can't run a cable to the Pi) • Raspberry Pi (I've used 1 per room however I will add a multi-DAC tutorial once I complete it myself) • SD card 2GB or larger • AC Adaptor (I used a USB wall charger for mobile phones check here • Micro USB cable • USB wireless adaptor (MAKE SURE IT IS COMPATIBLE OUT OF THE BOX!
School Technology Needs Assessment (STNA) - SERVE Center at the University of North Carolina at Greensboro
BackgroundThe School Technology Needs Assessment (STNA, say "Stenna") was originally developed by SEIR*TEC at SERVE in collaboration with the North Carolina Department of Public Instruction's Educational Technology Division, as part of the LANCET project (Looking at North Carolina Educational Technology). The STNA was created to help building-level planners collect and analyze needs data related to implementation of the NC IMPACT technology integration model, as well as other contemporary frameworks for examining technology use in teaching and learning. The STNA is typically accessed through a web address unique to each school, using a free online surveying system provided by SERVE. A summary of the results of a study on STNA is available from SERVE (PDF). A copy of a paper presented at the 2007 annual meeting of the American Evaluation Association in Baltimore, MD detailing the study is also available. A sample of the online STNA is available for review.
Escape your search engine Filter Bubble!
