The Experts below are selected from a list of 18498 Experts worldwide ranked by ideXlab platform
Ponniah Sankarakumar - One of the best experts on this subject based on the ideXlab platform.
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automated test solutions for multifunctional protection relays
2012Co-Authors: Sunping Sheng, S. Richards, Ponniah SankarakumarAbstract:Currently, there are many challenges in the development of numerical, multifunctional Intelligent Electronic Devices (IEDs) paraphrased as relays in this paper. These are to continuously improve the design quality, to reduce the development period for shorter time to market, and to optimise the development cost and the product cost. One effective solution for these challenges is to develop automated test tools. These tools could then be used to build an automated test environment, which can be used to validate the new numerical multifunctional protection relay. This paper describes such an automated Validation test set-up being assembled for a new generation of numerical multifunctional protection relays. Obviously, the main aim of this automated Validation test-up was to test the new relays from an End User perspective and to enhance the product quality. After accomplishing the automated Validation testing, thousands of cases can be tested within an optimised time period without increasing the burden on project resources. This increases the testing efficiency and in turn, increases the Validation tests. This system also encourages the Validation Team to test communication aspects of the relay, and thereby preparing the relay to work in a Smarter Grid. The automated Validation test system is a proactive, secure, efficient, repeatable and an error-free approach to avoid product defects being found in-service by End Users. (5 pages)
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Automated test solutions for multifunctional protection relays
2012Co-Authors: Zhen Li, S. Richards, Sunping Sheng, Ponniah SankarakumarAbstract:Currently, there are many challenges in the development of numerical, multifunctional Intelligent Electronic Devices (IEDs) paraphrased as relays in this paper. These are to continuously improve the design quality, to reduce the development period for shorter time to market, and to optimise the development cost and the product cost. One effective solution for these challenges is to develop automated test tools. These tools could then be used to build an automated test environment, which can be used to validate the new numerical multifunctional protection relay. This paper describes such an automated Validation test set-up being assembled for a new generation of numerical multifunctional protection relays. Obviously, the main aim of this automated Validation test-up was to test the new relays from an End User perspective and to enhance the product quality. After accomplishing the automated Validation testing, thousands of cases can be tested within an optimised time period without increasing the burden on project resources. This increases the testing efficiency and in turn, increases the Validation tests. This system also encourages the Validation Team to test communication aspects of the relay, and thereby preparing the relay to work in a Smarter Grid. The automated Validation test system is a proactive, secure, efficient, repeatable and an error-free approach to avoid product defects being found in-service by End Users.
Takeo Tadono - One of the best experts on this subject based on the ideXlab platform.
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PRISM on-orbit geometric calibration and DSM performance
2009Co-Authors: Junichi Takaku, Takeo TadonoAbstract:The Panchromatic Remote-sensing Instrument for Stereo Mapping (PRISM) carried by the Advanced Land-Observing Satellite was designed to generate worldwide topographic data with its high-resolution and stereoscopic observation. For this objective, the on-orbit geometric performance of PRISM sensors has been widely assessed and calibrated since the launch in January 2006 as an activity of the calibration and Validation Team of the Japan Aerospace Exploration Agency's Earth Observation Research Center. This ongoing activity has generated various geometric performance data over two and a half years of on-orbit operation. A suite of geometric model parameters was calibrated to express the geometric characteristics of the PRISM sensors. These include static interior parameters (charge-coupled device camera parameters) and dynamic exterior parameters (orbit data, attitude data, and sensor alignment). The interior parameters were calibrated using test-field self-calibration with test sites of dense ground control points (GCPs). The exterior parameters were calibrated by adaptive orientation with test sites of worldwide GCPs. These parameters are correlated to the direct geolocation accuracy of the PRISM sensors and are monitored and validated to maintain performance. The performance of the digital surface model (DSM) derived from these geometric model parameters was analyzed. The detailed characteristics of the triangulation results were analyzed by GCPs, and the height accuracy was evaluated based on comparisons with high-accuracy high-resolution reference DSM data sets derived from Lidar and aerial photo matching of various terrain features.
Ariane Bazureau - One of the best experts on this subject based on the ideXlab platform.
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gomos high resolution temperature Validation by the masi and esabc groups
2004Co-Authors: Florence Goutail, Ariane BazureauAbstract:RESUME At the 2 nd Workshop of the Atmospheric Chemistry Validation of Envisat (ACVE-2), re-processed high resolution temperature data from GOMOS (GOPR_LV2/6.0a) were evaluated using independent satellite data. This paper presents results of the Validation activities of Service d'Aeronomie, CNRS, France, member of the MASI and ESABC Validation subgroup of the Atmospheric Chemistry Validation Team (ACVT) for Envisat.
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gomos water vapour Validation by the masi group
2004Co-Authors: Florence Goutail, Ariane BazureauAbstract:RESUME At the 2 nd Workshop of the Atmospheric Chemistry Validation of Envisat (ACVE-2), re-processed water vapour data from GOMOS (GOPR_LV2/6.0a) were evaluated using independent satellite data. This paper presents results of the Validation activities of Service d'Aeronomie, CNRS, France, member of the Modelling and Assimilation and Satellite Intercomparison (MASI) Validation subgroup of the Atmospheric Chemistry Validation Team (ACVT) for Envisat.
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mipas temperature Validation by the masi group
2004Co-Authors: A Dethof, Florence Goutail, Ariane Bazureau, Alan J Geer, W A Lahoz, D Y Wang, T Von ClarmannAbstract:RESUME At the 2 Workshop of the Atmospheric Chemistry Validation of Envisat (ACVE-2), re-processed temperature data from MIPAS (V 4.61) were evaluated using data assimilation models and independent satellite data. This paper presents results of the Validation activities of the following groups: (i) the European Centre for Medium-range Weather Forecasts; (ii) the Data Assimilation Research Centre UK; (iii) The Institut fur Meteorologie und Klimaforschung at the Universitat Karlsruhe; and (iv) Service d’Aeronomie, CNRS, France, who are all members of the Modelling and Assimilation and Satellite Intercomparison (MASI) Validation subgroup of the Atmospheric Chemistry Validation Team (ACVT) for Envisat.
Sunping Sheng - One of the best experts on this subject based on the ideXlab platform.
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automated test solutions for multifunctional protection relays
2012Co-Authors: Sunping Sheng, S. Richards, Ponniah SankarakumarAbstract:Currently, there are many challenges in the development of numerical, multifunctional Intelligent Electronic Devices (IEDs) paraphrased as relays in this paper. These are to continuously improve the design quality, to reduce the development period for shorter time to market, and to optimise the development cost and the product cost. One effective solution for these challenges is to develop automated test tools. These tools could then be used to build an automated test environment, which can be used to validate the new numerical multifunctional protection relay. This paper describes such an automated Validation test set-up being assembled for a new generation of numerical multifunctional protection relays. Obviously, the main aim of this automated Validation test-up was to test the new relays from an End User perspective and to enhance the product quality. After accomplishing the automated Validation testing, thousands of cases can be tested within an optimised time period without increasing the burden on project resources. This increases the testing efficiency and in turn, increases the Validation tests. This system also encourages the Validation Team to test communication aspects of the relay, and thereby preparing the relay to work in a Smarter Grid. The automated Validation test system is a proactive, secure, efficient, repeatable and an error-free approach to avoid product defects being found in-service by End Users. (5 pages)
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Automated test solutions for multifunctional protection relays
2012Co-Authors: Zhen Li, S. Richards, Sunping Sheng, Ponniah SankarakumarAbstract:Currently, there are many challenges in the development of numerical, multifunctional Intelligent Electronic Devices (IEDs) paraphrased as relays in this paper. These are to continuously improve the design quality, to reduce the development period for shorter time to market, and to optimise the development cost and the product cost. One effective solution for these challenges is to develop automated test tools. These tools could then be used to build an automated test environment, which can be used to validate the new numerical multifunctional protection relay. This paper describes such an automated Validation test set-up being assembled for a new generation of numerical multifunctional protection relays. Obviously, the main aim of this automated Validation test-up was to test the new relays from an End User perspective and to enhance the product quality. After accomplishing the automated Validation testing, thousands of cases can be tested within an optimised time period without increasing the burden on project resources. This increases the testing efficiency and in turn, increases the Validation tests. This system also encourages the Validation Team to test communication aspects of the relay, and thereby preparing the relay to work in a Smarter Grid. The automated Validation test system is a proactive, secure, efficient, repeatable and an error-free approach to avoid product defects being found in-service by End Users.
Stefano Dietrich - One of the best experts on this subject based on the ideXlab platform.
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the passive microwave neural network precipitation retrieval pnpr algorithm for amsu mhs observations description and application to european case studies
2014Co-Authors: Paolo Sano, Giulia Panegrossi, Daniele Casella, F Di Paola, Lisa Milani, A Mugnai, M Petracca, Stefano DietrichAbstract:The purpose of this study is to describe a new al- gorithm based on a neural network approach (Passive mi- crowave Neural network Precipitation Retrieval - PNPR) for precipitation rate estimation from AMSU/MHS observa- tions, and to provide examples of its performance for spe- cific case studies over the European/Mediterranean area. The algorithm optimally exploits the different characteristics of Advanced Microwave Sounding Unit-A (AMSU-A) and the Microwave Humidity Sounder (MHS) channels, and their combinations, including the brightness temperature (TB) dif- ferences of the 183.31 channels, with the goal of having a sin- gle neural network for different types of background surfaces (vegetated land, snow-covered surface, coast and ocean). The training of the neural network is based on the use of a cloud- radiation database, built from cloud-resolving model simula- tions coupled to a radiative transfer model, representative of the European and Mediterranean Basin precipitation clima- tology. The algorithm provides also the phase of the precip- itation and a pixel-based confidence index for the evaluation of the reliability of the retrieval. Applied to different weather conditions in Europe, the al- gorithm shows good performance both in the identification of precipitation areas and in the retrieval of precipitation, which is particularly valuable over the extremely variable environ- mental and meteorological conditions of the region. The PNPR is particularly efficient in (1) screening and re- trieval of precipitation over different background surfaces; (2) identification and retrieval of heavy rain for convective events; and (3) identification of precipitation over a cold/iced background, with increased uncertainties affecting light pre- cipitation. In this paper, examples of good agreement of pre- cipitation pattern and intensity with ground-based data (radar and rain gauges) are provided for four different case studies. The algorithm has been developed in order to be easily tai- lored to new radiometers as they become available (such as the cross-track scanning Suomi National Polar-orbiting Part- nership (NPP) Advanced Technology Microwave Sounder (ATMS)), and it is suitable for operational use as it is com- putationally very efficient. PNPR has been recently extended for applications to the regions of Africa and the South At- lantic, and an extended Validation over these regions (using 2 yr of data acquired by the Tropical Rainfall Measuring Mis- sion precipitation radar for comparison) is the subject of a pa- per in preparation. The PNPR is currently used operationally within the EUMETSAT Hydrology Satellite Application Fa- cility (H-SAF) to provide instantaneous precipitation from passive microwave cross-track scanning radiometers. It un- dergoes routinely thorough extensive Validation over Europe carried out by the H-SAF Precipitation Products Validation Team.
