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Real Time Clocks Versus Virtual Clocks
[chapter]
1986
Control Flow and Data Flow: Concepts of Distributed Programming
Preserved Fulltext
symmetric distributed termination algorithms are systematically developed. ...
Solutions are first presented in an abstract setting of Dijkstra, Feijen and Van Gasteren [DFGJ and then gradually transformed into solutions to the distributed termination problem of Francez [FJ. ...
It is incremented by one at the places Where before the clock was consulted, i.e. where the assignment T:=CLOCK-TIMEi took place and is synchronized with other clocks in the same way as before. ...
doi:10.1007/978-3-642-82921-5_11
fatcat:jdtipjnugvecpbubmcs24swafi
Aerial Vehicles Tracking Using Noncoherent Crowdsourced Wireless Networks
[article]
2021
arXiv
pre-print
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This article first presents an analysis of the effects of lack of clock synchronization in ATM with CWN and provides solutions based on the presence of few trustworthy sensors in a large non-coordinated ...
In this work, we propose an ATM solution by exploiting noncoherent crowdsourced wireless networks (CWNs) and correcting the inherent clock-synchronization problems present in such non-coordinated sensor ...
For instance, with LSTM-based synchronization, Figure 9 shows a roughly 3% difference in performance between the scenarios with one GSN and three GSNs. ...
arXiv:2108.00922v1
fatcat:jswl7gqv2ja2rnn6ud4mxb342a
Detecting global predicates in distributed systems with clocks
2000
Distributed computing
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This paper proposes a framework for detecting global state predicates in systems of processes with approximately-synchronized real-time clocks. ...
Complexity analysis shows that under reasonable assumptions, these real-time-clock-based detection algorithms are less expensive than detection algorithms based on Lamport's happened-before ordering. ...
In most local-area distributed systems, protocols like NTP can e ciently maintain synchronization of clocks to within a few milliseconds 26 . ...
doi:10.1007/s004460050069
fatcat:rpcg2od24rgzdk4p4sjvcf2ipe
Detecting global predicates in distributed systems with clocks
[chapter]
1997
Lecture Notes in Computer Science
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This paper proposes a framework for detecting global state predicates in systems of processes with approximately-synchronized real-time clocks. ...
Complexity analysis shows that under reasonable assumptions, these real-time-clock-based detection algorithms are less expensive than detection algorithms based on Lamport's happened-before ordering. ...
In most local-area distributed systems, protocols like NTP can e ciently maintain synchronization of clocks to within a few milliseconds 26 . ...
doi:10.1007/bfb0030684
fatcat:xmg5ovmznffsjhbwj3ilidnlya
A SYNCHRONOUS WIDEBAND FREQUENCY-DOMAIN METHOD FOR LONG-DISTANCE CHANNEL MEASUREMENT
2013
Electromagnetic Waves
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Its core consists of: (1) baseband signal generators at the transmission terminal and the reception terminal respectively are used to generate the wideband signal of the same frequency; (2) the two GPS ...
This paper proposes a novel synchronous wideband frequency domain method for measuring time domain response of longdistance channel. ...
The two ends of measurement system were synchronized in frequency and phase with the external reference of 10 MHz generated by a rubidium clock. ...
doi:10.2528/pier13013012
fatcat:xijkc2o23fdarfhrrqg3b7eefq
Implementation of a general-purpose stored-program digital optical computer
1994
Applied Optics
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The architecture is also the first to employ time-of-flight synchronization. That is, there are no flip-flops used as synchronizing memory elements. ...
The authors are with the Optoelectronic Computing Systems Center, University of Colorado at Boulder, Boulder, Colorado 80309-0525. ...
Synchronization was accomplished by electrically stretching the pulse at a C terminal and by clock gating. ...
doi:10.1364/ao.33.001619
pmid:20862187
fatcat:guxwfihnnza7jfyolenz3gcvza
A taxonomy of distributed termination detection algorithms
1998
Journal of Systems and Software
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An important problem in the ®eld of distributed systems is that of detecting the termination of a distributed computation. ...
Distributed termination detection (DTD) is a dicult problem due to the fact that there is no simple way of gaining knowledge of the global state of the system. ...
As opposed to Rana's clock (Rana, 1983 ), Mayo and Kearns create an algorithm for``roughly synchronized clocks''. ...
doi:10.1016/s0164-1212(98)10034-1
fatcat:mmknad2ftfewjhb45qy6yjpp2a
Design Techniques for Streamlined Integration and Fault Tolerance in a Distributed Sensor System for Line-crossing Recognition
2007
2007 16th International Conference on Computer Communications and Networks
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This provides a general method for achieving such synchronization with reduced hardware requirements and reduced energy consumption compared to conventional approaches, which rely on generic interface ...
Such applications involve resource-limited embedded sensor nodes that communicate with each other through self-organizing protocols. ...
Moreover, every time a node receives a valid packet from its neighbor, it carries out the clock synchronization scheme with its neighbor so that clock drift is prevented. ...
doi:10.1109/icccn.2007.4318007
dblp:conf/icccn/ShenKBG07
fatcat:yji4dnuynncxnee4wz4xmn36wa
Experimental Demonstration of Delay-Bounded Wireless Network Based on Precise Time Synchronization
[article]
2022
arXiv
pre-print
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This paper experimentally demonstrates the fundamental principles of CSMA/AP by constructing a star-topology wireless network using software-defined radio terminals combined with precise time synchronization ...
Indeed, Yamasaki et al. proposed a new delay-bounded wireless MAC protocol named Carrier Sense Multiple Access with Arbitration Point (CSMA/AP), exploiting precise time synchronization among all devices ...
The PPS signals that the Wi-Wi modules provide have synchronization errors that roughly follow a normal distribution with 3σ = 400 ns [19] . ...
arXiv:2207.00158v1
fatcat:odpo3gzp4zb7jmy3zmtvhi3iba
Flexible and Reconfigurable Mismatch-Tolerant Serial Clock Distribution Networks
2012
IEEE Transactions on Very Large Scale Integration (vlsi) Systems
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The system uses a closed-loop synchronization phase to combine the clock skew reduction of an actively synchronized clock network with an open-loop operating phase that minimizes power consumption like ...
We present a clock distribution network that emphasizes flexibility and layout independence. ...
a sinusoidal forward phase clock with a reverse phase clock produced by reflecting the forward clock off of a ground termination at the opposite end of the conductor [22] . ...
doi:10.1109/tvlsi.2011.2104982
fatcat:g2gfz5uwxje4xcokb6i7h4xxg4
Self-stabilization of Byzantine Protocols
[chapter]
2005
Lecture Notes in Computer Science
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Many distributed tasks (e.g. clock synchronization) possess ecient non-stabilizing solutions tolerating Byzantine faults or conversely non-Byzantine but self-stabilizing solutions. ...
The synchronized pulses are used as events for initializing Byzantine agreement on every node's local state. The set of local states is used for global predicate detection. ...
Acknowledgements: We wish to thank Shlomi Dolev and Hanna Parnas for stimulating discussions with regards to the current result. ...
doi:10.1007/11577327_4
fatcat:jitv2iqw55be5cv3ikwso4tqze
A Low-Overhead Asynchronous Interconnection Network for GALS Chip Multiprocessors
2010
2010 Fourth ACM/IEEE International Symposium on Networks-on-Chip
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The network eliminates the need for global clock distribution, and can interface multiple synchronous timing domains operating at unrelated clock rates. ...
components operate at the same clock rate, with stable but unknown phase differences) and plesiochronous (all components operate at nominally identical clock rates, but with slight frequency mismatch) ...
Detection circuits generate signals to stall synchronous terminals in order to to prevent overrun or underrun conditions in the FIFO. ...
doi:10.1109/nocs.2010.14
dblp:conf/nocs/HorakNCV10
fatcat:qjzzqw7qufgu5eb2tmrgk7oxza
Design of a SPDIF receiver using protocol compiler
1998
Proceedings of the 35th annual conference on Design automation conference - DAC '98
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The design was done with Protocol Compiler, a high-level synthesis tool for the design of structured data stream processing controllers. ...
The data bit rate is roughly 2.8 MHz allowing transmissions of audio samples with frequencies up to 44 KHz. The clock speed of the code bits is consequently about 5.6 MHz. ...
Since the receiver runs on a higher clock speed than the SPDIF source and both clocks are not synchronized, one has to allow for variances in the pattern at the receiver side. ...
doi:10.1145/277044.277243
dblp:conf/dac/HoltmannB98
fatcat:wx6mqzo43jcm3dfylhkq2uq7oa
Space-time reference with an optical link
2016
Classical and quantum gravity
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With a well-defined orbit and a synchronized clock, the satellite cold serve as a high-accuracy Space-Time Reference, providing precise time worldwide, a valuable reference frame for geodesy, and independent ...
We describe a method for realizing a high-performance Space-Time Reference (STR) using a stable atomic clock in a precisely defined orbit and synchronizing the orbiting clock to high-accuracy atomic clocks ...
The STR approach could be used to transfer Time (epoch) and frequency from high-performance clocks at national standards labs to relatively small transportable ground terminals, with roughly 30 cm receive ...
doi:10.1088/0264-9381/33/13/135007
fatcat:y4cnfomnwfgf5ko5ppswfqbnwe
On-Chip Surfing Interconnect
[chapter]
2012
Advanced Circuits for Emerging Technologies
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We use distributed varactors to dynamically vary the latency of LC interconnects and thus effect surfing. ...
Chains of these surfing buffers attenuate jitter making them well suited for source-synchronous interconnect. ...
Such chains can be used in clock distribution networks or for clock forwarding for source-synchronous communication. Here, our focus is on source synchronous designs. ...
doi:10.1002/9781118181508.ch16
fatcat:n2ijhbjlrbe63bi6vhbrwexa3a
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