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Page 1281 of Mathematical Reviews Vol. , Issue 99b [page]

1991 Mathematical Reviews  
{For the entire collection see MR 99a:68016.} 99b:68167 68T20 Rodriguez, Rita V. (1-WFL-C; Pensacola, FL); Anger, Frank D. (1-WFL-C; Pensacola, FL) Using constraint propagation to reason about unsynchronized  ...  In applications for which temporal inter- vals and their relations are appropriate, constraint propagation is a recognized reasoning tool.  ... 

Joint Ranging and Synchronization for an Anchorless Network of Mobile Nodes

Raj Thilak Rajan, Alle-Jan van der Veen
2015 IEEE Transactions on Signal Processing  
A unique solution is non-existent without a constraint on the cost function ( clock reference node).  ...  For a set of nodes, a pairwise least squares solution is proposed for estimating the pairwise range parameters between the nodes, in addition to estimating the clock offsets and clock skews.  ...  In addition, instead of the classic constraint of using a single clock reference, alternative sum constraint and nullspace constraint are proposed (Section VI) which are shown to yield about a factor of  ... 
doi:10.1109/tsp.2015.2391076 fatcat:dd7wlo65j5derfotfxc32c4dmm

HRTS: A Hierarchical Reactive Time Synchronization Protocol for Wireless Sensor Networks [chapter]

Saeid Pourroostaei Ardakani, Julian Padget, Marina De Vos
2014 Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering  
Due to the constraints on sensor nodes' energy resources and the vulnerability of the distributed infrastructure of wireless network, an efficient, scalable and accurate time synchronization protocol is  ...  This paper presents an accurate and efficient reactive protocol, named HRTS, that synchronizes the sensor nodes' clock based on the node's demand.  ...  In addition to the points that we mentioned, HRTS can be beneficial in routing, network coverage and clustering as below: -Routing: ITable and STable provide a set of useful information about the sensor  ... 
doi:10.1007/978-3-319-14225-8_4 fatcat:oesqlddmrvgwhemg7cab4qykfa

Effect of Interrupt Logic on Delay Balancing Circuit

N. Suresh Kumar, D.V. Rama Koti Reddy
2011 International Journal of Computer Applications  
Instead in the present system Interrupt logic is used for delay balancing, thereby providing more feasible and accurate circuit path. General Terms Digital Systems, Clock Scheme.  ...  But it is very difficult to obtain exact delay needed in the circuit.  ...  Itshall first derive the conditions for clocking of the latestand the earliest data propagating in the circuit, which is representing the register constraints.  ... 
doi:10.5120/3288-4479 fatcat:pt6bu4ohpjb5np2umsiyurb5si

HRTS: A Hierarchical Reactive Time Synchronization Protocol for Wireless Sensor Networks [chapter]

Saeid Pourroostaei Ardakani, Julian Padget, Marina De Vos
2014 Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering  
Due to the constraints on sensor nodes' energy resources and the vulnerability of the distributed infrastructure of wireless network, an efficient, scalable and accurate time synchronization protocol is  ...  This paper presents an accurate and efficient reactive protocol, named HRTS, that synchronizes the sensor nodes' clock based on the node's demand.  ...  In addition to the points that we mentioned, HRTS can be beneficial in routing, network coverage and clustering as below: -Routing: ITable and STable provide a set of useful information about the sensor  ... 
doi:10.1007/978-3-319-04105-6_4 fatcat:u44wpcmfm5afphnyfy4cstngsy

APE-Sync: An Adaptive Power Efficient Time Synchronization for Mobile Underwater Sensor Networks

Feng Zhou, Qi Wang, Guangjie Han, Gang Qiao, Zongxin Sun, Ahmed Niaz
2019 IEEE Access  
Several time synchronization protocols have been presented for terrestrial radio networks, but they cannot be instantly utilized to real-time underwater sensor networks due to the slow propagation speed  ...  The proposed scheme takes into account the time-varying clock skew and combines the Doppler-Enhanced synchronization protocol (DE-Sync) and the Kalman filter tracking the clock skew to achieve time synchronization  ...  These protocols, however, cannot be instantly applied to underwater sensor networks for the obvious reason that they suppose that the propagation delay is negligible among nodes which is not true in case  ... 
doi:10.1109/access.2019.2912229 fatcat:p6h7fcinkfgetcvsfghelx5ay4

D-sync

Feng Lu, Diba Mirza, Curt Schurgers
2010 Proceedings of the Fifth ACM International Workshop on UnderWater Networks - WUWNet '10  
While an impediment to communication, we will show that the Doppler shift contains highly useful information that can be leveraged to greatly improve time synchronization.  ...  However, there exist two fundamental challenges to underwater synchronization, namely, large propagation delays and substantial node mobility during the synchronization process.  ...  Further, it requires only a single two-way exchange between the beacon and an unsynchronized node to obtain the unknown propagation delay and clock offset.  ... 
doi:10.1145/1868812.1868815 dblp:conf/wuwnet/LuMS10 fatcat:vl4daytpcbgwfc7yhbafiagoly

Clock synchronization considerations in security informed safety assurance of autonomous systems of systems

Elena Lisova, Aida Causevic, Elisabeth Uhlemann, Mats Bjorkman
2017 IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society  
We demonstrate how an outcome of a security analysis can be used as input for the overall safety analysis and we use an autonomous quarry as an example application to illustrate our findings.  ...  Communications in systems with any type of real-time requirements, where data validity is based on its freshness, rely on clock synchronization (CSyn) allowing its subsystems to cooperate and work coherently  ...  use control actions to create security requirements and constraints; iv) identify scenarios in which the security constraints are violated.  ... 
doi:10.1109/iecon.2017.8217473 dblp:conf/iecon/LisovaCUB17 fatcat:44xlounatfhzngt64j46fpo64i

On the Multihop Performance of Synchronization Mechanisms in High Propagation Delay Networks

Pai-Han Huang, Maulik Desai, Xiaofan Qiu, Bhaskar Krishnamachari
2009 IEEE transactions on computers  
In average, using one-way scheme can result in significant cumulative propagation error over multiple hops, and using two-way can lead to high variance of propagation error.  ...  clock skew estimation.  ...  delays, high relative clock skews, and longer inter-sync periods (due to even more severe energy constraints).  ... 
doi:10.1109/tc.2008.220 fatcat:zn4dkuujwzdb3eidibtkf4dnjy

Characterizing the Accuracy of a Self-Synchronized Reverse-GPS Wildlife Localization System

Adi Weller Weiser, Yotam Orchan, Ran Nathan, Motti Charter, Anthony J. Weiss, Sivan Toledo
2016 2016 15th ACM/IEEE International Conference on Information Processing in Sensor Networks (IPSN)  
Second, extensive use of known-position beacon transmitters, to synchronize the clocks of receivers (radio-frequency TOA localization require accurate clocks), to characterize and continuously monitor  ...  Localization errors of wild animals carrying our transmitters (when stationary in nest boxes) have standard deviation of about 5m and mean of 5-15m (but sometimes as high as 24m).  ...  That is, they err by about 1ns (equivalent to about 30cm at radio propagation speed) per second.  ... 
doi:10.1109/ipsn.2016.7460662 dblp:conf/ipsn/WeiserONCWT16 fatcat:45u5f3ycufbibjzfyc34islfpi

Time Synchronization for High Latency Acoustic Networks

A. A. Syed, J. Heidemann
2006 Proceedings IEEE INFOCOM 2006. 25TH IEEE International Conference on Computer Communications  
Although at very short distances existing protocols are adequate, TSHL shows twice the accuracy at 500m, demonstrating the need to model both clock skew and propagation latency.  ...  With acoustic communication, where the propagation speed is nearly five orders of magnitude slower than RF, assumptions about rapid communication are incorrect and new approaches to time synchronization  ...  We would especially like to thank David Moore whose insight and helpful tips allowed us to fine tune the ultrasound transducers.  ... 
doi:10.1109/infocom.2006.161 dblp:conf/infocom/SyedH06 fatcat:drfvvnolwnbzbpfiknye6vnhxm

Network Features of the Mammalian Circadian Clock

Julie E Baggs, Tom S Price, Luciano DiTacchio, Satchidananda Panda, Garret A FitzGerald, John B Hogenesch, Ueli Schibler
2009 PLoS Biology  
The use of multiple doses powered the analysis to uncover several novel network features of the circadian clock, including proportional responses and signal propagation through interacting genetic modules  ...  consistent with known biochemical constraints.  ...  We thank Hiroki Ueda and Yoichi Minami for sharing unpublished data about the U-2 OS model; Anthony Olarerin-George and Najaf Shah for assistance with data analysis; and Michael Hughes, Anthony Olarerin-George  ... 
doi:10.1371/journal.pbio.1000052 pmid:19278294 pmcid:PMC2653556 fatcat:ldxuaf3ryjgfbnyekovihl2may

Ranging Energy Optimization for Robust Sensor Positioning Based on Semidefinite Programming

Tao Wang, G. Leus, Li Huang
2009 IEEE Transactions on Signal Processing  
This motivates us to investigate ranging energy optimization problems.  ...  In most sensor positioning systems, sensors and beacons need to emit ranging signals to each other.  ...  ACKNOWLEDGMENT The authors would like to thank D. Neirynck, F. Shu, and G. Dolmans at Holst Centre for their suggestions.  ... 
doi:10.1109/tsp.2009.2028211 fatcat:mzxdhw5vk5ervfvnhepznz4zm4

Ranging energy optimization for robust sensor positioning

Tao Wang, Geert Leus, Dries Neirynck, Feng Shu, Li Huang
2009 2009 IEEE International Conference on Acoustics, Speech and Signal Processing  
This motivates us to investigate ranging energy optimization problems.  ...  In most sensor positioning systems, sensors and beacons need to emit ranging signals to each other.  ...  ACKNOWLEDGMENT The authors would like to thank D. Neirynck, F. Shu, and G. Dolmans at Holst Centre for their suggestions.  ... 
doi:10.1109/icassp.2009.4960064 dblp:conf/icassp/WangLNSH09 fatcat:egllqjmp5zfh7exqp22gdurpwu

Time synchronization in sensor networks: a survey

F. Sivrikaya, B. Yener
2004 IEEE Network  
Many applications of sensor networks need local clocks of sensor nodes to be synchronized, requiring various degrees of precision.  ...  The intention is not to synchronize clocks but to be able to reason about the relative order between messages or events.  ...  The sources of this delay depend on the MAC scheme used, but some typical reasons for delay are waiting for the channel to be idle or waiting for the TDMA slot for transmission. • Propagation Time: This  ... 
doi:10.1109/mnet.2004.1316761 fatcat:lezpeywqrjbjdcl545hhdd6cde
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