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70 results on '"Astsatryan, Hrachya"'

51. An interoperable web portal for parallel geoprocessing of satellite image vegetation indices

Author

Astsatryan Hrachya, Narsisian Wahi, Hayrapetyan Andranik, Saribekyan Albert, Asmaryan Shushanik, Muradyan Vahagn, Yaniss Guigoz, Gregory Giuliani, and Nicolas Ray

Abstract

The main objective of this paper is to introduce a portal of geoprocessing services that can be used to compute either a single vegetation index or a combination of vegetation indices, as a workflow. High Performance Computing (HPC) resources are used for the calculations, and the Web Processing Service (WPS) standard is used to handle the requests from and the responses to the portal. In case of a workflow, a single node of the cluster is dedicated to each index, and the number of used cores depends on the complexity of the task. In addition, based on a series of experiments made to accelerate remote sensing image processing, a parallelization method within the computational node is automatically chosen depending on the complexity of the operations and the amount of data. The suggested algorithm optimizes the processing by selecting the best methodology (serial or parallel) and the number of cores to efficiently manipulate and distribute the data. The interoperable web portal, Spatial Data Infrastructure (SDI) and the heterogeneous resources of HPC cluster are located in the same local area network, and the cluster nodes have access to the data via network file system sharing. The use of standardized web services makes it possible to use remote data as inputs.

Published
2013

52. An interoperable cloud-based scientific GATEWAY for NDVI timeseries analysis

Author

Astsatryan Hrachya, Hayrapetyan Andranik, Narsisian Wahi, Asmaryan Shushanik, Saghatelyan Armen, Muradyan Vahagn, Giuliani Gregory, Guigoz Yaniss, and Ray Nicolas

Abstract

Processing of high-resolution time series satellite images typically requires a large amount of computational resources and time. We introduce here a scientific gateway for computing the Normalized Difference Vegetation Index (NDVI) time series data. Based on a distributed workflow using the Web Processing Service (WPS) standard, the gateway aims to be completely interoperable with other standardized tools. The availability of this gateway may help researchers to acquire knowledge of land cover changes more efficiently over very large spatial and temporal extents, which is especially important in the context of Armenia for which timely decisionmaking is needed.

Published
2013

57. Toward the Development of an Integrated Spatial Data Infrastructure in Armenia

Author

Astsatryan, Hrachya, Narsisian, W., Ghazaryan, V., Saribekyan, A., Asmaryan, Sh., Muradyan, V., Guigoz, Yaniss, Giuliani, Gregory, and Ray, Nicolas

Subjects
ddc:333.7-333.9, ddc:550, SWAT, SDI, Hydrological model, Interoperability, Distributed computing, Geospatial data, Lake Sevan
Abstract

Armenia as a developing country has a very severe need to integrate and collabo- rate with the international Geospatial community in order to build a reliable and efficient geospatial infrastructure. Moreover, the availability of such an infrastructure could foster the availability of geospatial data, could facilitate the development of a data sharing policy at national level, and could help to efficiently provide Armenian data to the local and inter- national communities. The goal of the article is to introduce the proposed integrated Geo- spatial infrastructure that is composed of a Spatial Data Infrastructure, tools, services, geo- computational facilities and benchmarking results of some services. The infrastructure will be discussed in the context of hydrological modeling in Armenia.

Published
2012

58. Physics and Earth Science User Communities of Armenian National Grid Initiative

Author

Sahakyan, Vladimir, Shoukourian, Yuri, Mkoyan, Sargis, Asatryan, Hrachya, Kryuchkyan, Gagik, Akopov, Norayr, Sargsyan, Lusine, Mickaelian, Areg, and Astsatryan, Hrachya

Subjects
ArVO, CMAQ, eInfrastructure, ArmNGI, WRF, Hermes, ArmGrid, Quantum Informatics, Grid, IVOA, Monte Carlo, QCD
Abstract

The main purpose of this article is to present the results and activities of physics and earth sciences heavy user communities of Armenian National Grid Initiative (ArmNGI) using computational or storage resources of Armenian National Grid infrastructure (ArmGrid).

Published
2010

59. The DFBS Spectroscopic Database and the Armenian Virtual Observatory

Author

Mickaelian, Areg M, Sargsyan, Lusine A, Astsatryan, Hrachya V, Cirimele, Giuseppe, and Nesci, Roberto

Subjects
Database, Surveys, Markarian galaxies, Low-dispersion spectra, Databases, Virtual Observatories, Armenian, media_common.quotation_subject, Classification scheme, Virtual observatory, computer.software_genre, language.human_language, Computer Science Applications, Photometric calibration, Sky, Computer Science (miscellaneous), language, lcsh:Science (General), computer, Geology, media_common, lcsh:Q1-390
Abstract

The Digitized First Byurakan Survey (DFBS) is the digitized version of the famous Markarian Survey. It is the largest low-dispersion spectroscopic survey of the sky, covering 17,000 square degrees at galactic latitudes |b|>15. DFBS provides images and extracted spectra for all objects present in the FBS plates. Programs were developed to compute astrometric solution, extract spectra, and apply wavelength and photometric calibration for objects. A DFBS database and catalog has been assembled containing data for nearly 20,000,000 objects. A classification scheme for the DFBS spectra is being developed. The Armenian Virtual Observatory is based on the DFBS database and other large-area surveys and catalogue data.

Published
2009

62. On defining a web interface for linear algebra tasks over computational grids

Author

Astsatryan, Hrachya, Caron, Eddy, Daydé, Michel, Hurault, Aurélie, Pantel, Marc, National Academy of Sciences of the Republic of Armenia [Yerevan] (NAS RA), Algorithms and Software Architectures for Distributed and HPC Platforms (AVALON), Inria Grenoble - Rhône-Alpes, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Laboratoire de l'Informatique du Parallélisme (LIP), École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Informatique du Parallélisme (LIP), Université de Lyon-Université de Lyon-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS), Algorithmes Parallèles et Optimisation (IRIT-APO), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Institut National Polytechnique (Toulouse) (Toulouse INP), Assistance à la Certification d’Applications DIstribuées et Embarquées (IRIT-ACADIE), ANR-05-CIGC-0011,LEGO,League for Efficient Grid Operations(2005), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Toulouse Mind & Brain Institut (TMBI), Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), and Université de Toulouse (UT)

Subjects
[INFO.INFO-DC]Computer Science [cs]/Distributed, Parallel, and Cluster Computing [cs.DC], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2007

69. Armenian virtual observatory simple image access service

Author

Knyazyan Aram, Astsatryan Hrachya, and Mickaelian Areg

Abstract

The aim of the article is to introduce the data sharing service of the Armenian Virtual Observatory (ArVO) based on the Simple Image Access (SIA) Protocol of the International Virtual Observatory Alliance (IVOA).

Published
2016

70. О некоторых моделях очередей в вычислительных грид-системах

Author

Sahakyan Vladimir, Շուքուրյան Յուրի, Ասցատրյան Հրաչյան, Юрий Шукурян, Грачя Асцатрян, Shoukourian Yuri, and Astsatryan Hrachya

Abstract

Հոդվածում առաջարկվում է հաշվողական գրիդ-համակարգի համար հերթի պարամետրիկ մոդելը: Մոդելը հաշվի է առնում առաջադրանքի հերթում սպասման և կատարման թույլատրելի ժամանակները: В статье предложена параметрическая модель очереди для вычислительной грид-системы. Модель учитывает ограничения на допустимые времена ожиданий и промежутков выполнения заданий. In this paper parametric models of the queues are proposed in grid systems. The models take into account the restrictions on the waiting and interval of execution time of the tasks В статье предложена параметрическая модель очереди для вычислительной грид-системы. Модель учитывает ограничения на допустимые времена ожиданий и промежутков выполнения заданий.

Published
2016

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