822 Hits in 1.9 sec

Pleiades: Distributed Structural Invariants at Scale

Simon Bouget, Yerom-David Bromberg, Adrien Luxey, Francois Taiani
2018 2018 48th Annual IEEE/IFIP International Conference on Dependable Systems and Networks (DSN)  
We then present the design and workings of PLEIADES (Section III), before moving on to its evaluation (Section IV). We discuss related work (Section V) and conclude (Section VI).  ...  We show for instance how a system with 25,600 nodes organized in a ring of rings is able to reform its overall structure after 50% of the nodes have crashed in 11 rounds, while consuming less than 2kB  ...  Abstract-Modern large scale distributed systems increasingly espouse sophisticated distributed architectures characterized by complex distributed structural invariants.  ... 
doi:10.1109/dsn.2018.00062 dblp:conf/dsn/BougetBLT18 fatcat:xftnivmdjzashe3om3cmeipe5i

The dynamical evolution of the Pleiades

Joseph M. Converse, Steven W. Stahler
2010 Monthly notices of the Royal Astronomical Society  
This study builds on our previous one that established statistically the present-day structure of this system.  ...  The ancient Pleiades also had significant mass segregation, which persists in the cluster today. In the future, the central density of the Pleiades will continue to fall.  ...  Thus, we project the three-dimensional distribution of stars on to a two-dimensional plane, assumed to lie at the mean Pleiades distance of 133 pc (Soderblom et al. 2005) .  ... 
doi:10.1111/j.1365-2966.2010.16505.x fatcat:jd7er72uxzet3mlvonxkcsgq6e

Mapping with Pléiades—End-to-End Workflow

Roland Perko, Hannes Raggam, Peter M. Roth
2019 Remote Sensing  
Our workflow is demonstrated for the Pléiades satellite constellation, however, the applied building blocks are more general and thus also applicable for different setups.  ...  Thus, a variety of data sets showing different acquisition scenarios are gathered, allover comprising 24 Pléiades images. First, the accuracies of the 2D and 3D geo-location are analyzed.  ...  For a partly forested region at test site Innsbruck with 550 × 550 m 2 Figure 21 shows a Pléiades ortho-image as well as the height differences between the LiDAR and the Pléiades DSM, scaled from −25  ... 
doi:10.3390/rs11172052 fatcat:ttewykfugbfvnn4hmb5l2u3hgm

Stellar Spins in the Pleiades, Praesepe, and M35 Open Clusters [article]

Brian F. Healy, P. R. McCullough, Kevin C. Schlaufman
2021 arXiv   pre-print
We determine the sin i values of 42, 35, and 67 stars in each cluster, respectively, and from their distributions we find that isotropic spins and moderate alignment are both consistent with the Pleiades  ...  We analyze spectroscopic and photometric data to determine the projected inclinations of stars in three open clusters: the Pleiades, Praesepe, and M35.  ...  Some of the data presented in this paper were obtained from the Mikulski Archive for Space Telescopes (MAST) at the Space Telescope Science Institute.  ... 
arXiv:2109.08692v2 fatcat:l4bhjg5u7bgrlmdf5nmgx2g2by

A near-infrared search for brown dwarfs in the Pleiades

D. A. Simons, E. E. Becklin
1992 Astrophysical Journal  
The idea of looking for brown dwarfs in the Pleiades was, after all, his. My numerous observing trips on Mauna Kea with Eric during my first two years at  ...  The basic structure of the plot is a combination of relatively blue faint background stars together with cluster members along the red edge of the color distribution.  ...  In this case, the areal coverage in the Pleiades and control fields scale more favorably (a factor of 1.4) and the residual of 7 objects in the Pleiades fields is significant at the 10 level.  ... 
doi:10.1086/171293 fatcat:s37cerr5gbbb3akmbw3x3vxjxa


Jeremy R. King, Simon C. Schuler, L. M. Hobbs, Marc H. Pinsonneault
2010 Astrophysical Journal  
We suggest that this real abundance component is the manifestation of relic differences in erstwhile pre-main-sequence Li burning caused by effects of surface activity on stellar structure.  ...  The simplest explanation of the Li, K, CN, and photometric data is that there must be a real abundance component to the Pleiades Li dispersion.  ...  However, little such mixing is expected to have occurred at the Pleiades age (∼100 Myr).  ... 
doi:10.1088/0004-637x/710/2/1610 fatcat:f6hl74skjndjdowpvrj53wbjge

A comparison of Landsat 8, RapidEye and Pleiades products for improving empirical predictions of satellite-derived bathymetry

C. Cahalane, A. Magee, X. Monteys, G. Casal, J. Hanafin, P. Harris
2019 Remote Sensing of Environment  
In this study, a selection of satellite datasets (Landsat 8, RapidEye and Pleiades) at different spatial and spectral resolutions were tested using a log ratio transform to derive bathymetry in an Atlantic  ...  However, the highest spatial resolution imagery used - Pleiades (2 m pixel size) showed good results across both non-spatial and spatial models which suggests a suitability for SDB prediction at a higher  ...  Supplementary data Supplementary data to this article can be found online at https://  ... 
doi:10.1016/j.rse.2019.111414 pmid:31787782 pmcid:PMC6876676 fatcat:tdxdu5nu4bb7jkjrlho37ho2lu

Wavelet based texture modeling for the classification of very high resolution maritime pine forest images

O. Regniers, L. Bombrun, D. Guyon, J.-C Samalens, C. Tinel, G. Grenier, C. Germain
2014 2014 IEEE Geoscience and Remote Sensing Symposium  
forest data and opens up perspectives for their use in the mapping of mono-specific forest structure variables.  ...  These results obtained from panchromatic and multispectral PLEIADES data confirm the ability of such wavelet-based multivariate models to efficiently capture the textural properties of very high resolution  ...  at the stand scale.  ... 
doi:10.1109/igarss.2014.6946861 dblp:conf/igarss/RegniersBGSTGG14 fatcat:fqecdn73mvhb5ho7em3xnyfagu

Wavelet based texture modeling for panchromatic very high resolution image classification: Application to oyster racks detection

O. Regniers, L. Bombrun, V. Lafon, A. Dehouck, C. Tinel, C. Germain
2014 2014 IEEE Geoscience and Remote Sensing Symposium  
evaluates the potential of wavelet-based texture multivariate modeling for the detection of cultivated oyster fields and their differentiation from abandoned fields in Very High Resolution panchromatic PLEIADES  ...  This paper is structured as follows.  ...  To achieve this objective, we used the panchromatic band of a PLEIADES data acquired at low tide on 25 April 2013.  ... 
doi:10.1109/igarss.2014.6947657 dblp:conf/igarss/RegniersBLDTG14 fatcat:4fq3oclrmvazxcs7q4v6aaoy3e

Supervised Classification of Very High Resolution Optical Images Using Wavelet-Based Textural Features

Olivier Regniers, Lionel Bombrun, Virginie Lafon, Christian Germain
2016 IEEE Transactions on Geoscience and Remote Sensing  
In both cases, at least one of the tested multivariate models displays higher classification accuracies than Gray Level Cooccurrence Matrix descriptors.  ...  The use of the proposed strategy is illustrated in two real case applications using Pléiades panchromatic images: the detection of vineyards and the detection of cultivated oyster fields.  ...  ACKNOWLEDGMENT The authors would like to thank the Recette Thématique Utilisateur/ORFEO and ISIS program of the CNES for providing the Pléiades images used in this study.  ... 
doi:10.1109/tgrs.2016.2526078 fatcat:cgv2lpz3e5a5lif7v3zrpl3u7e

Cosmic microwave background map-making at the petascale and beyond

Rajesh Sudarsan, Julian Borrill, Christopher Cantalupo, Theodore Kisner, Kamesh Madduri, Leonid Oliker, Yili Zheng, Horst Simon
2011 Proceedings of the international conference on Supercomputing - ICS '11  
Since this growth is projected to continue for at least the next decade, it will be critical to extend the analysis algorithms and their implementations to peta-scale high performance computing (HPC) systems  ...  We present a new communication strategy that removes this bottleneck, allowing for CMB analyses of unprecedented scale and hence fidelity.  ...  , since these are invariably unique to each experiment.  ... 
doi:10.1145/1995896.1995944 dblp:conf/ics/SudarsanBCKMOZS11 fatcat:4etfpyhpbnfbtj63foexy75hkm

The Effect of Spiral Structure on the Stellar Velocity Distribution in the Solar Neighborhood

A. C. Quillen, Ivan Minchev
2005 Astronomical Journal  
Clumps in the solar neighborhood's stellar velocity distribution could be caused by spiral density waves.  ...  The Pleiades/Hyades moving group corresponds to the first family of orbits and the Coma Berenices moving group corresponds to the second family.  ...  The region at at negative v in the u, v plane is elongated toward negative u and so could encompass both the Hyades and Pleiades moving groups.  ... 
doi:10.1086/430885 fatcat:tbgdoogfdbganbwwjbm3jmxqua


P. A. Cargile, D. J. James, J. Pepper, R. B. Kuhn, R. Siverd, K. G. Stassun
2014 Astrophysical Journal  
distributions of clusters at ages up to 1.1 Gyr.  ...  The rotation period distribution has a morphology similar to the coeval Pleiades cluster, suggesting the universal nature of stellar rotation distributions.  ...  drawn from the larger Pleiades distribution.  ... 
doi:10.1088/0004-637x/782/1/29 fatcat:qef3hzymtjguvl3czcxt4txxyu

Classification of oyster habitats by combining wavelet-based texture features and polarimetric SAR descriptors

O. Regniers, L. Bombrun, I. Ilea, V. Lafon, C. Germain
2015 2015 IEEE International Geoscience and Remote Sensing Symposium (IGARSS)  
The authors also wish to thank CNES and its Thematic Users Commissioning team for providing the Pléiades data and the DLR for providing the TerraSAR-X data.  ...  This texture-based approach relies on the use of a multivariate model (Spherically Invariant Random Vector (SIRV) with a G 0 distribution (SIRVg0 in the following) [5] ) to represent the joint distribution  ...  The first is a panchromatic Pléiades image acquired at low tide in April 2013 with a spatial resolution of 0.5 m (PAN in the following).  ... 
doi:10.1109/igarss.2015.7326674 dblp:conf/igarss/RegniersBILG15 fatcat:p2xuvepzevfyjpctxbbxhazhzm

Star cluster formation and some implications for GAIA [article]

Pavel Kroupa
2011 arXiv   pre-print
The properties of such phase-space structures in the Milky Way (MW) field depend on the effective gravitational potential of the MW.  ...  Taking gas-expulsion into account, it has been shown that one single pre-ONC CSFE evolves, via gas expulsion, through the ONC at an age of about 1 Myr, to the Pleiades at an age of about 100 Myr and then  ...  It is remarkable that all these clusters at a mass scale of about 1000 M are so similar.  ... 
arXiv:1111.5613v2 fatcat:anpbkmgzb5bi3hjz4kqoengpfu
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