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[pdf] UTM: Air Traffic Management for Low-Altitude Drones - NASA
"NASA’s Ames Research Center in Moffett Field, Calif., with
its extensive experience in autonomous systems and air
traffic management, is leading the UTM research in close
collaboration with NASA’s Armstrong Flight Research Center in
Edwards, Calif.; NASA’s Glenn Research Center in Cleveland;
and NASA’s Langley Research Center in Hampton, Va. Ames
has a history of conducting research in autonomy-related
topics, and is experienced at developing systems that can
adapt their behavior to environments that are complex, rapidly
changing and incompletely understood"

"NASA’s development and demonstration of technologies for a
possible future UTM system take place during four Technology
Capability Level (TCL) activities"
UTM  UAS  drones  traffic  traffic-management  aviation  factsheet 
june 2017 by pierredv
Joint Analysis of Traffic and Channel Power Distributions in 3G Wireless Telecommunications Networks (PDF)
charts of network traffic by site percentile; discussion of Relation Between Loading and Channel Power; definition of Received Total Wideband Power, or RTWP
3G  cellular  RF  engineering  traffic 
july 2015 by pierredv
WSDOT - Tolling - I-405 Express Toll Lanes
"Electronic signs will post the toll rate, which will be based on destination and automatically adjust depending on traffic volume."
WSDOT  traffic  pricing  congestion-pricing 
january 2015 by pierredv
49ers’ stadium Wi-Fi served 25,000 concurrent users, 2.13TB in all | Ars Technica
Quote: "We offloaded 2.13 terabytes during the event," 49ers VP of Technology Dan Williams told Mobile Sports Report. The newly built Levi's Stadium has 68,500 seats and more than a third of attendees used the Wi-Fi network simultaneously. "We peaked at 24,775 (roughly 38 percent of attendance) concurrent connections with an average of 16,862 (roughly 25 percent of attendance)," Williams said.
Wi-Fi  stadiums  sport  traffic  congestion  ArsTechnica 
august 2014 by pierredv
42nd St paradox: Cull the best to make things better - physics-math - 16 January 2014 - New Scientist
"According to the emerging science of networks, there are good reasons why some systems perform better in seemingly disadvantageous conditions." Dietrich Braess, late 60s: "while working on ways to find the optimal solution for traffic flow through a network of roads that he made a surprising discovery: adding an extra street to a simple network can actually increase overall travel times" Good road traffic example why Nash Equilibrium isn't optimal: "Suppose five drivers choose the 10-minute journey on the highway. The other five take the shorter route giving them a 5-minute commute. Now the average journey time is 7.5 minutes – the shortest possible average." Examples from other fields: basketball, electricity generation, wireless grids, food webs, metabolic pathways
Braess  Nash  nash.equilibrium  network  NewScientist  networking  network-analysis  traffic  disease  ** 
july 2014 by pierredv
Wireless Demand Projections – Elasticity of the Top-1% Percent Users | Media & Telecom: Valuation & Financial Consulting
Turns out that U.S. wireless traffic growth projections are being scaled back. Armand Musey thinks it’s due to Wi-Fi offload, and demand elasticity (i.e. if you force people to pay, they use less) The second factor was driven by the phasing out of unlimited data plans. But curiously, Musey reckons that carriers appear to be returning to unlimited data plans, so growth will pick up again. Presumably (and I guess not surprisingly) carriers will use Econ 101 to scale their customers’ data demand to the spectrum supply they’ve been able to extract from the FCC.
wireless  data  broadband  traffic  projections  ex  Armand  Musey 
january 2014 by pierredv
Someone's Been Siphoning Data Through a Huge Security Hole in the Internet | Threat Level | Dec 2013
Quotes: Earlier this year, researchers say, someone mysteriously hijacked internet traffic headed to government agencies, corporate offices and other recipients in the U.S. and elsewhere and redirected it to Belarus and Iceland, before sending it on its way to its legitimate destinations. They did so repeatedly over several months. BGP eavesdropping has long been a known weakness, but no one is known to have intentionally exploited it like this until now. The technique doesn’t attack a bug or flaw in BGP, but simply takes advantage of the fact that BGP’s architecture is based on trust. To intercept data, anyone with a BGP router or control of a BGP router could send out an announcement for a range of IP addresses he wished to target that was narrower than the chunk advertised by other network routers. The announcement would take just minutes to propagate worldwide and, just like that, data that should have headed to those networks would begin arriving to the eavesdropper’s router in
BGP  cybersecurity  man-in-the-middle  eavesdropping  internet  traffic  Renesys  ex  Wired 
december 2013 by pierredv
Mobile data will grow 6.3 times between 2013 and 2018 and growth will be strongest outside Europe and North America - Insight - News | Analysys Mason
"In most developed economies, the volume of public Wi-Fi traffic has grown much faster than mobile data during the past 2 years. This has been driven mainly by fixed and cable operators rather than MNO offload strategies, but small cells will have enabled MNOs to stabilise and begin to reverse the trend of handset offloading to Wi-Fi by the end of the forecast period (2018). We expect that public Wi-Fi will primarily carry mid- and large-screen traffic (and handsets' share of public Wi-Fi traffic will decline), and many fixed- or cable-provided public Wi-Fi services will evolve into hybrid MVNO, small-cell and Wi-Fi networks."
small-cells  cellular  trends  traffic  AnalysysMason  MVNO  data  traffic  forecast  cable  Wi-Fi  mobile  data 
october 2013 by pierredv
New FHWA report reveals US busiest highways - aug 2013
"Traffic volume data from 2011, the most recent year available, show that the I-5 in California was the nation's busiest interstate, with 21.4 billion miles travelled that year. California's neighbouring I-10 and I-110 followed as the second and third busiest, respectively. Los Angeles' section of I-405 serves an estimated 379,000 vehicles per day, making it the busiest interstate in any American city."
California  traffic  congestion  Federal  Highway  Administration  (FHWA) 
august 2013 by pierredv
Speed Cam Contractor Responds To Challenged Tickets By Cropping Photos, Moving Cameras | Techdirt
"Its system in Florida now sports one of the shortest yellow lights in the country, just a shade above the absolute minimum. Decreasing a yellow light by a half-second can result in double the amount of tickets issued. Of course, it also increases the number of accidents, but that's hardly of concern to the red light cam contractor."
traffic  surveillance  unintended-consequences  evidence 
august 2013 by pierredv
re:log - Besucherstromanalyse per re:publica W-LAN
via "re:log [] by German data designers OpenDataCity reveals the movements of about 6,700 different electronic devices during re:publica 2013, a prestigious European conference on the topic of Digital Society. A dynamic map of the conference location shows the approximate locations of the devices when they were connected to the local WiFi hotspots. An interactive timeline underneath allows to explore the dynamic changes over time, while a rectangular area can be drawn to more specifically highlight and follow a smaller amount of dots. The visualization was based on tracking the MAC addresses of the devices according to the WiFi hotspot they were connected to. This data, which can be downloaded, was fully anonymized, yet the authors mention their desire to allow people to look up their own MAC address in the future."
visualization  traffic  via  information  aesthetics  blob  mapping  Wi-Fi 
july 2013 by pierredv
Low-cost radar: A programme worth watching | The Economist March 2013
Trial of passive radar by Thales and NATS, British air traffic control agency multi-static primary surveillance radar (MSPSR) "The growth in radio and television broadcasts—especially with digital and high-definition TV—now provides an enormous amount of high-frequency radio waves which are ideally suitable for passive radar systems. Moreover, the availability of cheap and powerful computing makes it feasible to analyse the data required to build a system like MSPSR. Thales and its partners expect to be able to produce results as good as conventional radar. "The trials are designed to see how passive radar could support Britain’s air-traffic management. . . With growing demand for wireless devices, passive radar would allow the radio spectrum currently used by conventional radar to be freed up and auctioned off to mobile operators."
aviation  air  traffic  control  ATC  NATS  DTV  UK  Thales  radar  TheEconomist 
march 2013 by pierredv
Braess' Paradox Infects Social Networks Too, Say Computer Scientists | MIT Technology Review Mar 2013
"One of the increasingly famous paradoxes in science is named after the German mathematician Dietrich Braess who noted that adding extra roads to a network can lead to greater congestion. Similarly, removing roads can improve travel times. Traffic planners have recorded many examples of Braess’ paradox in cities such as Seoul, Stuttgart, New York and London. And in recent years, physicists have begun to study how it might be applied in other areas too, such as power transmission, sporting performance where the removal of one player can sometimes improve a team’s performance and materials science where the network of forces within a material  can be modified in counterintuitive ways, to make it expand under compression, for example. Today,  Krzysztof Apt at the University of Amsterdam in The Netherlands and a couple of pals reveal an entirely new version of this paradox that occurs in social networks in which people choose products based on the decisions made by their friends. "
traffic  Arxiv  MIT-Technology-Review  complex-systems  Braess 
march 2013 by pierredv
Netherlands Highways Will Glow in the Dark Starting Mid-2013 | Autopia |
"The Smart Highway by Studio Roosegaarde and infrastructure management group Heijmans won Best Future Concept at the Dutch Design Awards, and has already gone beyond pure concept. The studio has developed a photo-luminising powder that will replace road markings — it charges up in sunlight, giving it up to 10 hours of glow-in-the-dark time come nightfall. "
x:wired  via:GMSV  netherlands  nether  traffic  design 
november 2012 by pierredv
IXPs: the key to sustaining and expanding a healthy global Internet ecosystem - Insight - News | Analysys Mason
" Internet market players began to create more interconnection facilities across a range of countries and regions, in the form of Internet exchange points (IXPs)."
internet  architecture  topology  IXP  traffic  AnalysysMason 
february 2011 by pierredv
Cisco Visual Networking Index: Global Mobile Data Traffic Forecast Update, 2010–2015 [Visual Networking Index] - Cisco Systems
The historic data are indisputable – and amazing. I am much more skeptical about their projections, e.g. 95% CAGR in mobile traffic growth over the next five years. Their analysis is entirely demand driven; this was probably fine for their wireline survey since there is so much dark fiber, but one cannot ignore the scarcity of radio licenses. We’re near the Shannon limit, and massive new frequency allocations will not show up overnight; even reducing cell size will take time, assuming we’re not close to the spatial multiplexing limit. I don’t know how much extra traffic one can fit into the existing infrastructure and frequencies, but Cisco should at least have made an argument that this doesn’t matter.
Cisco  data  traffic  trends  mobile  wireless  factoids 
february 2011 by pierredv

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