vendredi 28 septembre 2012
mercredi 26 septembre 2012
lundi 24 septembre 2012
Java At Sea
Liquid Robotics charts a new course with expert help from Java pioneer James Gosling.
Duke's Choice Awards
Meet this year's winners!
Looking Ahead to Project Lambda
Java Language Architect Brian Goetz on the importance of lambda expressions
JCP Q&A: Ben Evans
The London JUG representative talks about the JCP and the Java community.
Java EE Connector Architecture 1.6
Adam Bien on deep integration with connector services in a lean way
DataFX: Populate JavaFX Controls with Real-World Data
Tools to retrieve, parse, and render data in a variety of JavaFX controls
Stephen Chin challenges your JavaFX skills.
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mercredi 19 septembre 2012
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vendredi 14 septembre 2012
The Engineer (United Kingdom) (09/12/12)
New research led by Intel marks a key step in the effort to commercialize probe-based storage technology with capabilities that exceed those of hard disk and solid-state drives. The researchers developed a long-lasting, ultra-high-density probe storage device by coating the tips of the probes with a thin metal. The device features an array of 5,000 ultra-sharp probes, which is integrated with on-chip electronic circuits. The researchers say the probes write tiny bits of memory as small as a few nanometers by sending short electrical pulses to a ferroelectric film, a material that can be given a permanent electric polarization by applying an electric field. High-speed data access requires that the probes slide quickly and frequently across the film. Wear can seriously degrade the write-read resolution of the device, so the team deposited a thin metal film of hafnium diboride on the probe tips. The metal film reduces wear and enables the probe tips to retain their write-read resolution at high speeds for distances exceeding eight kilometers. The data densities of the device exceed one terabit per square inch.
samedi 8 septembre 2012
vendredi 7 septembre 2012
Massachusetts Institute of Technology (MIT) researchers have developed Pyxis, a system that automatically streamlines Web sites' database access patterns, making the sites up to three times faster. Pyxis currently works with programs written in Java, but the researchers note that adapting it to other languages only requires changing the code that translates programs into graphical models. Pyxis automatically divides a program between application server and database server in a way that can be mathematically proven to not disrupt the operation of the program. Pyxis also monitors the central processing unit load on the database server, increasing or decreasing the application logic needed to execute depending on its available capacity. Pyxis transforms a program into a graph in which the nodes represent individual instructions in a program, and the edges represent the amount of data that each instruction passes to the next. Pyxis also aims to find a placement of nodes on two different servers that minimizes the total cost of the program. "Our tool is able to dynamically switch between them based on the current load on the server," says MIT's Alvin Cheung.
Technical University of Braunschweig researchers have found that smartphones can be joined together in a network, which when connected via Wi-Fi, can carry out increased numbers of megaflops. The researchers joined six low-powered phones and found they could carry out a combined 26.2 million calculations per second. Although that performance figure is low when compared to the processing power of a modern desktop computer, the research suggests that larger smartphone clusters could be useful. The system would be most powerful when there are large groups of phones charging at the same time. "The more people show up, the more computer power you potentially have available," says University of Bristol researcher Simon McIntosh-Smith. A business model could be developed to provide incentives for users to join, such as receiving subsidized phones for users who contribute time to the cluster, says Braunschweig researcher Felix Busching.
lundi 3 septembre 2012
Wall Street Journal
(08/26/12) Holly Finn
The new nonprofit Code for America (CfA), a kind of peace corps for geeks, has led the way in bringing online efficiency to offline government systems, handpicking a team of tech stars each year to take time off from their jobs and offer their services to local governments. CfA fellows have designed more than 35 apps, for everything from urban blight to school buses, and the group also runs an Accelerator program for civic startups. It took two CfA fellows just two and a half months to complete one government project that was expected to take two years and cost $2 million. CfA puts its fellows in a warehouse in San Francisco, where they bond with each other. "Coding sprints, design sprints, they're with us," says CfA executive director Jennifer Pahlka. The CfA fellows act more like a stealth team of computer-savvy SEALs when they fan out to do five-week research residences within city governments across the country. There are 26 fellows in eight cities this year, while 550 people have applied for 25 to 30 spots next year.