Filters








23 Hits in 5.1 sec

Railgun: streaming windows for mission critical systems [article]

João Oliveirinha, Ana Sofia Gomes, Pedro Cardoso, Pedro Bizarro
2020 arXiv   pre-print
In this paper, we propose Railgun, a fault-tolerant, elastic, and distributed streaming system supporting real-time sliding windows for scenarios requiring high loads and millisecond-level latencies.  ...  Some mission critical systems, such as fraud detection, require accurate, real-time metrics over long time windows on applications that demand high throughputs and low latencies.  ...  We believe that Railgun is the first distributed streaming engine able to deliver accurate metrics on strict mission-critical scenarios, such as fraud-detection.  ... 
arXiv:2009.00361v3 fatcat:j4fda4maqjgv7dfx3zw2ecx66a

Railgun: managing large streaming windows under MAD requirements [article]

Ana Sofia Gomes, João Oliveirinha, Pedro Cardoso, Pedro Bizarro
2021 arXiv   pre-print
In this paper, we propose Railgun, a fault-tolerant, elastic, and distributed streaming system supporting real-time sliding windows for scenarios requiring high loads and millisecond-level latencies.  ...  Some mission critical systems, e.g., fraud detection, require accurate, real-time metrics over long time sliding windows on applications that demand high throughput and low latencies.  ...  When 𝑠 year worldwide, these mission-critical systems have demanding is equal to 𝑤𝑠 , hopping windows do not overlap, and events belong latency requirements (e.g., <250 ms for 99.9% percentile  ... 
arXiv:2106.12626v1 fatcat:otrohxszszay7dwp4cdmcrfqke

A Low-Cost Launch Assistance System for Orbital Launch Vehicles

Oleg Nizhnik
2012 International Journal of Aerospace Engineering  
The author reviews the state of art of nonrocket launch assistance systems (LASs) for spaceflight focusing on air launch options.  ...  Proposed LAS can be implemented with the existing off-the-shelf hardware delivering 7 kg to low-earth orbit for the 5200 USD per kg.  ...  the proposed LAS/LVS, factor 1 may be critical.  ... 
doi:10.1155/2012/830536 fatcat:o47sse6ucvg4xgssfeornzmtai

Consequences of the technology survey and gap analysis on the EU DEMO R&D programme in tritium, matter injection and vacuum

Chr. Day, B. Butler, T. Giegerich, P.T. Lang, R. Lawless, B. Meszaros
2016 Fusion engineering and design  
For core fuelling, classical inboard pellet injection technology is selected, in principle similar to that proposed for ITER but aiming for higher launch speeds to achieve deep fuelling of the DEMO plasma  ...  enhancement gases) and tritium systems (tritium plant and breeder coolant purification) is delineated, driven by the DEMO key challenge to reduce tritium inventory.  ...  The authors would like to acknowledge the contributions made to the generation of the material for this paper by the following staff at CCFE, ENEA and KIT: Volker Hauer, Bernhard Plöckl, Sebastian Russell-Smith  ... 
doi:10.1016/j.fusengdes.2016.03.008 fatcat:hapz2fslqvflblh4pemxzgumb4

SDI, technology, survivability, and software

1989 ChoiceReviews  
It puts SDI technologies in context by reporting the kinds of ballistic missile defense (BMD) system architectures that the SDI organization has considered for "phased deployment. " It reviews the status  ...  might be deployable in the "phase-one' proposed for the mid to late 1990s.  ...  System Development, Deployment, and Support  ... 
doi:10.5860/choice.26-4465 fatcat:5olktx3bsne6zoxgwfikl4sdte

Review: Laser-Ablation Propulsion

Claude Phipps, Mitat Birkan, Willy Bohn, Hans-Albert Eckel, Hideyuki Horisawa, Thomas Lippert, Max Michaelis, Yuri Rezunkov, Akihiro Sasoh, Wolfgang Schall, Stefan Scharring, John Sinko
2010 Journal of Propulsion and Power  
Laboratory for two years and, since 1974, as a Senior Research Staff Member in the Advanced Optical Systems Group at Los Alamos (LANL).  ...  He has taught physics at the University of Natal for a quarter of a century.  ...  The authors sincerely thank Gregory Spanjers for his interest in this topic and for his encouragement during the writing of this review.  ... 
doi:10.2514/1.43733 fatcat:ynh4ksefzzegxa3xmpstadw3py

'Techno-Risk - The Perils of Learning and Sharing Everything' from a Criminal Information Sharing Perspective

John R. Sliter
2012 Social Science Research Network  
The vehicles use a Wi-Fi-like system to emit a basic safety message 10 times per second that forms the data stream that other in-vehicle devices use to determine when a potential traffic hazard exists.  ...  For example, the U.S. Navy has a 'railgun' that accelerates a 3.2 kg (7 pound) projectile to approximately 2.4 kilometers per second (5,400 mph).  ... 
doi:10.2139/ssrn.2143915 fatcat:4a7irg4xr5hqho3hwe6cdvpjmy

The electrothermal ramjet

P. J. WILBUR, C. E. MITCHELL, B. D. SHAW
1983 Journal of Spacecraft and Rockets  
For a specific mission (Earth escape), the idealized performance of elec- trothermal ramjet, electrothermal rocket and electromagnetic acceleration systems are compared.  ...  Relaxation of the tolerance should, for example, permit longer track lengths and lower ac- celeration levels than those required for railguns.  ... 
doi:10.2514/3.8593 fatcat:x574tswnejhlregc5afbmvdsoi

Development of Optoelectronic Sensors and Transceivers for Spacecraft Applications [chapter]

Jos M., Carlos Marcos, Alberto Carrasco, Ricardo Vergaz, Ramn Zaer
2011 Advances in Spacecraft Technologies  
In optical fiber systems, losses can approach less tan 0.15 dB/km and and multi-Gbps data streams can be transmitted over tens of thousands of kilometers without electronic regeneration.  ...  for impact testing of aeronautic and aerospace structures.  ...  Obviously the railgun must be positioned perpendicular to the laser barriers.  ... 
doi:10.5772/13807 fatcat:kbaq6452tzavho7vybtxoyd5gq

7th European Workshop on Astrobiology

2008 International Journal of Astrobiology  
sit technology required for astrobiology missions.  ...  Because of this, they have been proposed as candidates for biogenerative life support systems providing food, recycling water and producing oxygen for crew needs during planetary missions such as manned  ...  MELiSSA (Micro-Ecological Life Support System Alternative) is a bioregenerative life support system for future space flights developed by the European Space Agency.  ... 
doi:10.1017/s1473550407003965 fatcat:256yslfowrgdbf2nqauwipknqe

NEW DIMENSION OF U.S. – CHINA RELATIONS
НОВОЕ ИЗМЕРЕНИЕ АМЕРИКАНО-КИТАЙСКИХ ОТНОШЕНИЙ

E.V. DROZHASHCHIKH
2017 Mirovaya Ekonomika i Mezhdunarodnye Otnosheniya  
as critical infrastructure Space systems, including commercial systems, are viewed by some states as critical national infrastructure and strategic assets.  ...  Many spacefaring states consider their space systems an extension of national critical infrastructure, and a growing number view their space systems as critical to national security.  ...  essential services, the long-term sustainability of the space environment becomes a critical concern.  ... 
doi:10.20542/0131-2227-2017-61-10-51-56 fatcat:n5fghvivevgo7ow7pumzepsu6y

CHI NA'S ADVANCED WE APONS HEARI NG BE FOR E THE

unpublished
So it's this overall stream we have to keep an eye on. And I think a key mission and responsibility for the U.S.  ...  Another critical component technology for HEL laser sources, especially for tactical systems for which size and mass of the laser are critical, are pump diode lasers.  ...  The primary categories of missions for the PLA's unmanned weapons systems include, but are not limited, to the following: Intelligence, Surveillance, and Reconnaissance (ISR): A range of UAVs, equipped  ... 
fatcat:dqddhtw6cbc75mv7ypsr6n3lwy

The British Superpower, Irregular Warfare, and Military Honor

T.J. Linzy
2018 MCU Journal  
ARTICLE SUBMISSIONS The editors are looking for academic articles in the areas of international relations, geopolitical issues, national security and policy, and cyber security.  ...  To that end, MCUP launched the Marine Corps University Journal (MCU Journal) in 2010 to provide a forum for interdisciplinary discussion of national security and international relations issues and how  ...  If the United States is to continue to support security in Europe, we must understand Russia's strategy, and both the Georgian and Ukrainian conflicts provide a critical window into the Russian approach  ... 
doi:10.21140/mcuj.2018090203 fatcat:u7vmp3qei5hahcjbhozat7muza

Toward virtual biopsy through an all fiber optic ultrasonic miniaturized transducer: a proposal

A. Acquafresca, E. Biagi, L. Masotti, D. Menichelli
2003 IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control  
indicator ........Communication system software ............Streaming media ........Communication system traffic ........Communication system traffic control ........Computer networks ............Ad hoc  ...  disassembly ........Design for experiments ........Design for manufacture ........Design for quality ........Design for testability ........Design standards ........Design tools ........Graphics .....  ... 
doi:10.1109/tuffc.2003.1244749 fatcat:l3jre4etsvcqzfyz2jqggji3gy

Stanford Us-Russia Forum Research Journal

Alexis Lerner, Evelina Akimova, Andrey Bakalenko, Grace Baller, Mugi Bayarlkhagva, Joel Beckner, Tatti Currey, Alexander Dorofeev, Ziba Dzhafarova, Elza Ganeeva, Irina Gavrilova, Eugeniu Han (+19 others)
2017 Zenodo  
We are also grateful to Ken Martinez for his guidance, Alexis Lerner for her academic support, the Higher School of Economics for hosting our research presentations, and Fyodor Lukyanov, Dmitry Suslov,  ...  Acknowledgements The authors would like to thank the Stanford US Russia Program for providing a platform for international collaboration and Dr.  ...  space missions.  ... 
doi:10.5281/zenodo.1181947 fatcat:cuatqnwazrby3gdggnv7z6ue7a
« Previous Showing results 1 — 15 out of 23 results