Scalable data storage for PV monitoring systems

Efficient PV research which includes a prolonged data monitoring from multiple experiments with different characteristics, requires a scalable supporting system to handle all of the collected information. This paper presents the development of a relational database for hosting all the necessary information for data modeling, comparative analysis and O\&M systems. Ramer-Douglas-Peucker algorithm and Timescaledb compression are used to decrease the size of the time-series data and increase the performance of the queries. A decision-making algorithm is presented for selecting the optimal inputs to the Ramer-Douglas-Peucker algorithm to ensure the maximum disk space savings while not losing any of the necessary information. Furthermore, alternative ways of implementing the same database are provided.Comment: Editor: Geert Deconinck. 18th European Dependable Computing Conference (EDCC 2022), September 12-15, 2022, Zaragoza, Spain. Fast Abstract Proceedings - EDCC 202

Sborová tvorba Petra Ebena se zaměřením na antické náměty

Title: CHORAL WORKS PETR EBEN FOCUSED ON ANCIENT THEMES Author: Mgr. Solon Kladas Department: Music Department Supervisor: Prof. PhDr. Stanislav Pecháček, Ph.D. Abstract: In his thesis, the author deals with the life and work of one of the most important contemporary Czech composer Petr Eben. It monitors the whole choral and vocal- instrumental works from the beginning to the last period of his compositional work, it presents the last information about the lately composer's life and focuses on choral works, written on the ancient Greek text. The first chapter offers a brief description of the author's life, essential genealogy, his teachers and the first steps in the field of music. Furthermore there is a reference to musical education and family of the composer and also to his sojourns abroad. Another part is devoted to Eben's sources of inspiration, which the author himself finds in Christianity, antiquity, Gregorian chant, folk songs, classical and living languages, poetry, organ as a royal instrument or in the relationship to children. The following chapters contain on one side chronological overview of the Eben's choral work for all types of choirs (male, female, mixed and children's choirs) and on the other side the Eben's vocal instrumental compositions (cantatas, oratorios and sacred choral...Název: SBOROVÁ TVORBA PETRA EBENA SE ZAMĚŘENÍM NA ANTICKÉ NÁMĚTY Autor: Mgr. Solon Kladas Katedra: Katedra hudební výchovy Školitel: Prof. PhDr. Stanislav Pecháček, Ph.D. Abstrakt: Ve své práci se autor zabývá životem a dílem jednoho z nejvýznamnějších soudobých českých skladatelů Petra Ebena. Sleduje celou sborovou a vokálně-instrumentální tvorbu od počátku do posledního období jeho kompoziční tvorby, uvádí nejaktuálnější informace o poslední době skladatelského života a zaměřuje se na sborová díla se starořeckým textem. První kapitola přináší stručný životopis autora, základní rodovou genealogii, seznamuje čtenáře s jeho učiteli a prvními kroky v hudbě. Dále se zmiňuje o hudebním vzdělání a rodině autora a také o jeho pobytech v cizích zemích. Další část práce je věnována inspiračním zdrojům Ebenovy tvorby, které skladatel sám spatřoval v křesťanství, gregoriánském chorálu, lidové písni, klasických i živých jazycích, básnickém slově, varhanách jako královském hudebním nástroji, ve vztahu k dětem či v antice. Následující kapitoly obsahují na jedné straně chronologický přehled veškeré Ebenovy sborové tvorby pro všechny typy sborů (sbory mužské, ženské, smíšené a dětské) a na straně druhé celé Ebenovo vokálně-instrumentální dílo (kantáty, oratoria a duchovní sborové skladby) se stručnou charakteristikou...Oddělení pro vědeckou činnostPedagogická fakultaFaculty of Educatio

Investigating methods to improve photovoltaic thermal models at second-to-minute timescales

This paper presents a range of methods to improve the accuracy of equation-based thermal models of PV modules at second-to-minute timescales. We present an RC-equivalent conceptual model for PV modules, where wind effects are captured. We show how the thermal time constant $\tau$ of PV modules can be determined from measured data, and subsequently used to make static thermal models dynamic by applying the Exponential Weighted Mean (EWM) approach to irradiance and wind signals. On average, $\tau$ is $6.3 \pm 1~$min for fixed-mount PV systems. Based on this conceptual model, the Filter- EWM - Mean Bias Error correction (FEM) methodology is developed. We propose two thermal models, WM1 and WM2, and compare these against the models of Ross, Sandia, and Faiman on twenty-four datasets of fifteen sites, with time resolutions ranging from 1$~$s to 1$~$h, the majority of these at 1$~$min resolution. The FEM methodology is shown to reduce model errors (RMSE and MAE) on average for all sites and models versus the standard steady-state equivalent by -1.1$~$K and -0.75$~$K respectively.Comment: 24 pages, 11 figures, 8 table

Induction motors versus permanent magnet actuators for aerospace applications

This paper introduces a comparative study on the design of aerospace actuators concerning Induction Motor (IM) and Permanent Magnet Motor (PMM) technologies. In the analysis undertaken, the two candidate configurations are evaluated in terms of both their electromagnetic and thermal behavior in a combined manner. On a first step, the basic dimensioning of the actuators and their fundamental operational characteristics are determined via a time-stepping Finite Element (FE) analysis. The consideration of the thermal robustness of the proposed motor configurations is integrated in the design procedure, through the appropriate handling of their respective constraints. As a result, all comparisons are carried out on a common thermal evacuation basis. On a second step, a single objective optimization procedure is employed, considering several performance and efficiency indexes using appropriate weights. Manufacturing and construction related costs for both investigated topologies are considered employing specific penalty functions. The impact of the utilized materials is also examined. The resultant motor designs have been validated through manufactured prototypes illustrating their suitability for aerospace actuatio

Automated office blood pressure measurements in primary care are misleading in more than one third of treated hypertensives: The VALENTINE-Greece Home Blood Pressure Monitoring study

Abstract Background This study assessed the diagnostic reliability of automated office blood pressure (OBP) measurements in treated hypertensive patients in primary care by evaluating the prevalence of white coat hypertension (WCH) and masked uncontrolled hypertension (MUCH) phenomena. Methods Primary care physicians, nationwide in Greece, assessed consecutive hypertensive patients on stable treatment using OBP (1 visit, triplicate measurements) and home blood pressure (HBP) measurements (7 days, duplicate morning and evening measurements). All measurements were performed using validated automated devices with bluetooth capacity (Omron M7 Intelli-IT). Uncontrolled OBP was defined as ≥140/90 mmHg, and uncontrolled HBP was defined as ≥135/85 mmHg. Results A total of 790 patients recruited by 135 doctors were analyzed (age: 64.5 ± 14.4 years, diabetics: 21.4%, smokers: 20.6%, and average number of antihypertensive drugs: 1.6 ± 0.8). OBP (137.5 ± 9.4/84.3 ± 7.7 mmHg, systolic/diastolic) was higher than HBP (130.6 ± 11.2/79.9 ± 8 mmHg; difference 6.9 ± 11.6/4.4 ± 7.6 mmHg, p Conclusions In primary care, automated OBP measurements are misleading in approximately 40% of treated hypertensive patients. HBP monitoring is mandatory to avoid overtreatment of subjects with WCH phenomenon and prevent undertreatment and subsequent excess cardiovascular disease in MUCH

Choral works of Petr Eben focused on ancient themes

Title: CHORAL WORKS PETR EBEN FOCUSED ON ANCIENT THEMES Author: Mgr. Solon Kladas Department: Music Department Supervisor: Prof. PhDr. Stanislav Pecháček, Ph.D. Abstract: In his thesis, the author deals with the life and work of one of the most important contemporary Czech composer Petr Eben. It monitors the whole choral and vocal- instrumental works from the beginning to the last period of his compositional work, it presents the last information about the lately composer's life and focuses on choral works, written on the ancient Greek text. The first chapter offers a brief description of the author's life, essential genealogy, his teachers and the first steps in the field of music. Furthermore there is a reference to musical education and family of the composer and also to his sojourns abroad. Another part is devoted to Eben's sources of inspiration, which the author himself finds in Christianity, antiquity, Gregorian chant, folk songs, classical and living languages, poetry, organ as a royal instrument or in the relationship to children. The following chapters contain on one side chronological overview of the Eben's choral work for all types of choirs (male, female, mixed and children's choirs) and on the other side the Eben's vocal instrumental compositions (cantatas, oratorios and sacred choral..