It doesn’t matter how many war machines you have under your command if you can’t relay orders to their operators. Maintaining communications is just as important as firepower, and DARPA wants the armed forces to have as many contingencies as possible when networks go down or are actively jammed. Setting up a fallback network is even trickier on the open ocean, but the agency’s Tactical Undersea Network Architecture (TUNA) program is well on its way to a solution. That solution being a collection of “node” buoys, deployed from ships or planes, that are tethered together by fiber optic cables to create a radio frequency data network. The fiber cables connecting the buoys may be thin, but are being developed to survive 30 days in challenging underwater environments, which should cover the time it takes to restore normal comms. Powering the network presents another problem, though the University of Washington’s Applied Physics Lab have created a concept buoy that draws energy from the constant ebb and flow of the ocean. The TUNA program has been in DARPA’s pipeline for the past few years , and with the first phase now complete, the next step is to build a fully working system and test it at sea. DARPA’s seafaring solution compliments another ongoing program called Dynamic Network Adaptation for Mission Optimization (DyNAMO) . Its goal is to develop a system that allows all different types of equipment found in different types of aircraft to talk to each other, creating something of a peer-to-peer communications network in the sky. Source: DARPA
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DARPA tests buoy network for fallback military comms at sea
“Researchers at the University of Wisconsin-Madison are the first to have fabricated carbon nanotube transistors (CNTs) that outperform the current-density of conventional semiconductors like silicon and gallium arsenide, ” reports NanotechWeb. Slashdot reader wasteoid shares the site’s interview with one of the researchers: “When the transistors are turned on to the conductive state (meaning that current is able to pass through the CNT channel) the amount of current traveling through each CNT in the array approaches the fundamental quantum limit, ” he tells nanotechweb.org. “Since the CNTs conduct in parallel, and the packing density and conductance per tube are very high, the overall current density is very high too — at nearly twice that of silicon’s. The result is that these CNT array FETs have a conductance that is seven times higher than any previous reported CNT array field-effect transistor.” The research was funded in part by the U.S. Army and Air Force, as well as the National Science Foundation. “The implication here is that by replacing silicon with a CNT channel, it should be possible for us to make either a higher performing device or one that works at lower power.” In other news, Fujitsu announced this week that it’s joining an effort to release a 256-megabyte 55-nanometer carbon nanotube-based NRAM by 2018. Read more of this story at Slashdot. 
An anonymous reader writes: IBM is purchasing a company called Merge Healthcare for $1 billion. The company specializes in medical imaging software, and it will be a key new resource for IBM’s Watson AI. Big blue’s researchers estimate that 90% of all medical data is contained within images. Having a trove of them and the software to mine that data should help Watson learn how to make more accurate diagnoses. IBM thinks it’ll also provide better context for run-of-the-mill medical imaging. “[A] radiologist might examine thousands of patient images a day, but only looking for abnormalities on the images themselves rather than also taking into account a person’s medical history, treatments and drug regimens.” They can program Watson to do both. The AI is already landing contracts to assist with medical issues: “Last week, IBM announced a partnership with CVS Health, the large pharmacy chain, to develop data-driven services to help people with chronic ailments like diabetes and heart disease better manage their health.” Read more of this story at Slashdot. 