Browsing by Keyword "Round robin"
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Item Round robin performance testing of organic photovoltaic devices(2014-03) Gevorgyan, Suren A.; Zubillaga, Oihana; Vega de Seoane, José María; Machado, Maider; Parlak, Elif Alturk; Tore, Nesrin; Voroshazi, Eszter; Aernouts, Tom; Müllejans, Harald; Bardizza, Giorgio; Taylor, Nigel; Verhees, Wiljan; Kroon, Jan M.; Morvillo, Pasquale; Minarini, Carla; Roca, Francesco; Castro, Fernando A.; Cros, Stéphane; Lechêne, Balthazar; Trigo, Juan F.; Guillén, Cecilia; Herrero, José; Zimmermann, Birger; Sapkota, Subarna Babu; Veit, Clemens; Würfel, Uli; Tuladhar, Pabitra S.; Durrant, James R.; Winter, Stefan; Rousu, Sanna; Välimäki, Marja; Hinrichs, Volker; Cowan, Sarah R.; Olson, Dana C.; Sommer-Larsen, Peter; Krebs, Frederik C.; SISTEMAS FOTOVOLTAICOS; Tecnalia Research & InnovationThis study addresses the issue of poor intercomparability of measurements of organic photovoltaic (OPV) devices among different laboratories. We present a round robin performance testing of novel OPV devices among 16 laboratories, organized within the framework of European Research Infrastructure Project (SOPHIA) and European Energy Research Alliance (EERA). Three types of OPVs with different structures, dimensions and encapsulations are studied and compared with reference Si solar cells certified by accredited laboratories. The agreement of the measurements of these among different laboratories is analyzed by focusing on testing procedures, testing equipment and sample designs. A number of deviations and pitfalls are revealed and based on the analyses, a set of recommendations are suggested for improving the agreement among the measurements of such OPV technologies.Item Virtualization of the wireless medium: A simulation-based study(2009) Perez, Susana; Cabero, Jose Maria; Miguel, Eder; GENERAL; Tecnalia Research & InnovationThis work considers virtualization of the wireless medium as a mean to share common network physical infrastructure by different Virtual Operators (VO) based on a Time Division Multiple Access (TDMA) virtualization technique. We have developed a Wireless Medium Virtualization Framework (WMVF) to analyze the performance of a variable number of VOs (with one or more types of traffic) accessing to the same wireless medium through the same wireless node in a coordinated way. Extensive simulations have been carried out to assess the impact of wireless medium virtualization based on relevant parameters such as the type of traffic, the number of VOs and the specific wireless technology. Delay, jitter and the utilization of the network are the metrics used in this paper to show the potential and limitations of wireless virtualization as a way to increase network usage. This work has been carried out partially inside the European Project 4WARD (FP7 Project reference: 216041)