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3 results on '"Astsatryan, H."'

1. Web Portal for Photonic Technologies Using Grid Infrastructures

Author

Astsatryan, H. V., Gevorgyan, T. V., and Shahinyan, A. R.

Subjects
Physics - Computational Physics, Computer Science - Distributed, Parallel, and Cluster Computing, Quantum Physics
Abstract

The modeling of physical processes is an integral part of scientific and technical research. In this area, the Extendible C++ Application in Quantum Technologies (ECAQT) package provides the numerical simulations and modeling of complex quantum systems in the presence of decoherence with wide applications in photonics. It allows creating models of interacting complex systems and simulates their time evolution with a number of available time-evolution drivers. Physical simulations involving massive amounts of calculations are often executed on distributed computing infrastructures. It is often difficult for non expert users to use such computational infrastructures or even to use advanced libraries over the infrastructures, because they often require being familiar with middleware and tools, parallel programming techniques and packages. The P-RADE Grid Portal is a Grid portal solution that allows users to manage the whole life-cycle for executing a parallel application on the computing Grid infrastructures. The article describes the functionality and the structure of the web portal based on ECAQT package.

Published
2012
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2. Leading the way toward an environmental National Spatial Data Infrastructure in Armenia

Author

Asmaryan, Sh., Saghatelyan, A., Astsatryan, H., Bigagli, L., Mazzetti, P., Nativi, S., Guigoz, Yaniss, Lacroix, Pierre Marcel Anselme, Giuliani, Gregory, and Ray, Nicolas

Subjects
ddc:333.7-333.9, Environmental data, Open Geospatial Consortium, Data sharing, Armenia, Spatial data infrastructure
Abstract

Once the most industrialized republic of the Soviet Union, Armenia inherited a dramatic ecological situation from the Soviet era. As the key national environmental academic entity, the Center for Ecological‐Noosphere Studies (CENS) of the National Academy of Sciences of the Republic of Armenia has a strong national role in delivering authoritative environmental information and data sets. To enhance data sharing towards its stakeholders, CENS engaged in recent years in several international capacity building projects directed to the setting up of an environmental Spatial Data Infrastructure (SDI). These activities were successful in showing the potential of data sharing in Armenia, to gain visibility in the country and the South Caucasus region, and to start engaging in international voluntary partnerships such as the Group on Earth Observations (GEO). CENS now envisions to scale up its SDI infrastructure to an environmental national SDI (nSDI) in order to support a wider range of geospatial services. This paper discusses several aspects and challenges of the envisioned strategy. First, we present how the current components of the implemented SDI benefit the scientific and environmental communities in Armenia. Second, we examine how the EGIDA methodology can be applied to support the process of scaling up the infrastructure to become a nSDI, one of the pilot studies in the EU/FP7 EOPOWER project. Finally, we discuss the potential of future full‐scale provision of geospatial services in Armenia and how these could benefit the various stakeholders involved in Armenia and in the South Caucasus region.

Published
2014

3. Grid based calibration of SWAT hydrological models.

Author

Gorgan, D., Bacu, V., Mihon, D., Rodila, D., Abbaspour, K., Rouholahnejad, E., Rebora, N., and Astsatryan, H.

Subjects
CALIBRATION, GRID computing, HYDROLOGY, PREDICTION models, LAND management, WATERSHEDS, ENVIRONMENTAL protection, INFORMATION superhighway
Abstract

The calibration and execution of large hydrological models, such as SWAT (soil and water assessment tool), developed for large areas, high resolution, and huge input data, need not only quite a long execution time but also high computation resources. SWAT hydrological model supports studies and predictions of the impact of land management practices on water, sediment, and agricultural chemical yields in complex watersheds. The paper presents the gSWAT application as a web practical solution for environmental specialists to calibrate extensive hydrological models and to run scenarios, by hiding the complex control of processes and heterogeneous resources across the grid based high computation infrastructure. The paper highlights the basic functionalities of the gSWAT platform, and the features of the graphical user interface. The presentation is concerned with the development of working sessions, interactive control of calibration, direct and basic editing of parameters, process monitoring, and graphical and interactive visualization of the results. The experiments performed on different SWAT models and the obtained results argue the benefits brought by the grid parallel and distributed environment as a solution for the processing platform. All the instances of SWAT models used in the reported experiments have been developed through the enviroGRIDS project, targeting the Black Sea catchment area. [ABSTRACT FROM AUTHOR]

Published
2012
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