Search results for " multilevel"

showing 10 items of 65 documents

The Multilevel Model in the Computer-Generated Appraisal: A Case in Palermo

2017

The construction of a mass appraisal model requires the preliminary study of the real estate market, the sampling of sold properties, the development of a forecasting model and the verification of the appraisal results. They are generally computerised methods, that work with geo-referenced data. This experimental work has proceeded to build a mass appraisal model, collecting a data sample of sales of apartments in the city of Palermo, in the five years 2008–2012, using a multivariate statistical model (multilevel), testing the results and providing the operating applications in a scheme of online real estate valuations.

Scheme (programming language)Operations researchComputer scienceMass appraisalMultilevel model0211 other engineering and technologiesSampling (statistics)021107 urban & regional planningReal estate02 engineering and technologyWork (electrical)021105 building & constructionComputer-generated appraisal Multilevel models AVMSettore ICAR/22 - EstimoExperimental workMultivariate statisticalcomputercomputer.programming_language
researchProduct

Between Self-Organizing and Accelerating Networks: Untangling the multilevel of strategic networks

2010

This paper aims to detect the crucial determinants and processes that shape the emergence and evolution of interfirm network cognitive morphology. We pinpoint three relatively distinct but coexistent levels which define the fundamental structure of the network: the microsystemic (or the single firm) level; the mesosystemic (or the groups of firms within the network) level; and the macrosystemic (or the overarching network) level. Then, we integrate the complex system perspective (Morin, 1977; Prigogine and Stengers, 1984; Anderson, 1999) applied to networks with studies regarding theoretical models that elucidate network structuring and dynamics cultivated in the new “science of networks” (…

network cognitive dynamics self-organizing networks accelerating networks network cognitive domain network multilevel governanceSettore SECS-P/08 - Economia E Gestione Delle Imprese
researchProduct

Implementation on NI-SOM sbRIO-9651 and Experimental Validation of Multi-Carrier PWM Techniques for Three-Phase Five Level Cascaded H-Bridge Inverter

2021

Multilevel Power Inverters (MPIs) represent a valid solution to improve the performances of energy production systems from renewable energy sources. Furthermore, the use of novel FPGA control systems allows simplifying the implementation of multicarrier PWM techniques for MPIs with computational benefits. This paper describes the implementation of several multicarrier PWM techniques on NI-SOM sbRIO-9651 for the control of a three-phase five-level cascaded H-bridge inverter. In detail, sbRIO-9651 is a control system in the field of Power Electronics and Drives (PED) programmable in the LabVIEW graphical programming environment. The paper is focused on modulation techniques implementation, te…

Three-phaseComputer scienceFPGA Labview Multicarrier PWM techniques Multilevel power converter sbRIO-9651Control systemPower electronicsElectronic engineeringInverterSettore ING-IND/32 - Convertitori Macchine E Azionamenti ElettriciField-programmable gate arrayEnergy (signal processing)Pulse-width modulationPower (physics)
researchProduct

Experimental study on B-spline-based modulation schemes applied in multilevel inverters for electric drive applications

2019

This work presents the design, simulation, and experimental validation of new B-Spline-based modulation techniques applied to a Multilevel Power Inverter (MPI), particularly focusing the attention on the harmonic content of the output voltages of the inverter. Simulation and experimental results are proposed and discussed, mainly describing the potential benefits, such as the increase of the multi-level operation of the converter, and drawbacks (low-order harmonics) related to the adoption of B-Spline functions for multilevel inverters applied in the field of electrical drives.

Control and OptimizationComputer science020209 energyPower inverterPower conversion harmonicEnergy Engineering and Power Technology02 engineering and technologySettore ING-IND/32 - Convertitori Macchine E Azionamenti Elettricimodular multilevel convertersSettore ING-INF/01 - ElettronicaField (computer science)0202 electrical engineering electronic engineering information engineeringElectronic engineeringElectrical and Electronic EngineeringEngineering (miscellaneous)power conversion harmonicsRenewable Energy Sustainability and the EnvironmentB-spline020208 electrical & electronic engineeringModular multilevel converterPulse width modulation invertersSettore ING-IND/31 - ElettrotecnicaModulationHarmonicsHarmonicInverterEnergy (miscellaneous)Voltage
researchProduct

Experimental Comparative Analysis of Efficiency and THD for a Three-phase Five-level Cascaded H-Bridge Inverter Controlled by Several MC-PWM Schemes

2021

Cascaded H-Bridges Multilevel Inverters are an innovative and promising solution in different application fields. This topology allows obtaining an improvement in the performance (e.g. reduced harmonic content, the low voltage stress on power components, and high efficiency) in respect to the traditional two-level inverters. In this context, the Multicarrier-PWM strategies play an important role thanks to their features. This paper presents an experimental investigation on the performance of a three-phase five-level Cascaded H-Bridge inverter by using different PWM modulation strategies. In particular, the paper is focused on the experimental validation of the main features of Multicarrier …

Total harmonic distortionMulticarrier PWMTHDComputer scienceMultilevel power inverterModulation indexTopology (electrical circuits)Context (language use)EfficiencySettore ING-IND/32 - Convertitori Macchine E Azionamenti ElettriciEfficiency; FPGA; Multicarrier PWM; Multilevel power inverter; THDThree-phaseHarmonicElectronic engineeringInverterFPGAPulse-width modulationIECON 2021 – 47th Annual Conference of the IEEE Industrial Electronics Society
researchProduct

Simulation and experimental validation of multicarrier PWM techniques for three-phase five-level cascaded H-bridge with FPGA controller

2017

The FPGA represents a valid solution for the design and implementation of control systems for inverters adopted in many fields of power electronics because of its high flexibility of use. This paper presents an overview and an experimental validation of the MC SPWM techniques for a three-phase, five-level, cascaded H-Bridge inverter with FPGA controller-based. Several control algorithms are here implemented by means of the VHDL programming language and the output voltage waveforms obtained from the main PWM techniques are compared in terms of THD%. Simulation and experimental results are analyzed, compared and discussed.

PV systemsGrid connectedSettore ING-IND/31 - ElettrotecnicaFPGA; Grid connected; Multilevel Power Converter; PV systems; VHDLRenewable Energy Sustainability and the EnvironmentEnergy Engineering and Power TechnologyVHDLSettore ING-IND/32 - Convertitori Macchine E Azionamenti ElettriciFPGAMultilevel Power ConverterPV system
researchProduct

Women’s empowerment and child mortality: the case of Bangladesh

2018

Bangladesh is the Southern Asian country that has been experiencing the highest absolute decline in the Under Five Mortality Rate in the past 15 years. This paper focuses on the importance of women’s education and empowerment variables in explaining this extraordinary result. We use a twolevel multilevel logistic regression to take into account the great differences among territorial communities in terms of child mortality reduction. It emerges that the importance of woman’s empowerment - measured as individual and as mother - remains relevant even when the context is considered. A sensitivity analysis has been conducted to test the relevance of different indicators of female empowerment.
researchProduct

The Effect of Education on Under-Five Mortality: Individual and Community-Level Effects in Bangladesh

2019

This paper investigates the relationship between parental education and child survival, considering both the influence of the maternal and paternal educational level and the influence of communitylevel male and female education on under-five mortality. The research is focused on Bangladesh, a country where the impressive decline in the under-five mortality rate between 1990 and 2015 was attributed both to female empowerment and to the increase in the general level of education in the country. Using the Bangladesh Demographic and Health Survey from 2014, this paper investigates both the effect of individual-level parental education and of community-level education on under-five mortality, th…

Parental educationParental education; Under-five mortality; Multilevel model; Contextual effectparental education010102 general mathematicsUnder-five mortalityMultilevel modelSettore SECS-S/04 - Demografia01 natural sciencesunder-five mortalitymultilevel model03 medical and health sciences0302 clinical medicineContextual effect030212 general & internal medicine0101 mathematicscontextual effectlcsh:Statisticslcsh:HA1-4737Parental education Under-five mortality Multilevel model Contextual effect
researchProduct

Public Administration and the Study of Political Order: Towards a Framework for Analysis

2020

The contribution of this study is two-fold: First, it outlines a conceptual framework on political order; and secondly, it offers empirical illustrations on the case of Nordic cooperation. Taken together, the article makes a plea for public administration scholarship in the study of political order. Political order consists of a relatively stable arrangement of institutions that are fairly formalized and institutionalized. A common political order, moreover, entails that relevant institutions: (i) are fairly independent of pre-existing institutions; (ii) are relatively integrated and internally cohesive; and (iii) are reasonably able to influence governance processes within other institutio…

Allgemeines spezielle Theorien und Schulen Methoden Entwicklung und Geschichte der PolitikwissenschaftMulti-level governanceNordic cooperation; multilevel administration; multilevel governance; organizational approach; political order; public administrationSociology and Political SciencePolitikwissenschaftnordic cooperationPublic administrationPoliticspolitical orderPlealcsh:Political science (General)Political science0502 economics and businessmultilevel administration050602 political science & public administrationlcsh:JA1-92Political sciencemultilevel governanceCorporate governance05 social sciencespublic administration0506 political scienceScholarshipConceptual frameworkOrder (business)organizational approachddc:320Basic Research General Concepts and History of Political Science050203 business & managementPolitics and Governance
researchProduct

Sedentariness and weight status related to SES and family characteristics in Italian adults: exploring geographic variability through multilevel mode…

2017

Aim: In this study, our aim was to assess the prevalence of sedentariness and overweight/obesity, two modifiable risk factors for non-communicable diseases (NCDs), and to investigate the geographic variability in their association with socio-economic status (SES) and family characteristics in Italian adults. Methods: The Multipurpose Survey on Health Conditions and the Recourse to Health Services (MSHC), 2012/2013 edition, conducted by the National Institute of Statistics was used as data source. The sample for this study included 99,479 interviewed people aged 18 and over, which are representative of about 50 million persons. For the scope of this analysis, data were considered as individ…

AdultMalemedicine.medical_specialtyAdolescentfamily characteristic030209 endocrinology & metabolismOverweightBMI; family characteristics; multilevel models; non-communicable diseases; overweight/obesity; Sedentariness; SES; Public Health Environmental and Occupational HealthSettore MED/01 - Statistica Medica03 medical and health sciencesYoung AdultBMI0302 clinical medicineRisk FactorsmedicineHumans030212 general & internal medicineObesitynon-communicable diseaseSedentarineSedentary lifestyleAgedFamily Characteristicsbusiness.industryPublic healthMultilevel modelPublic Health Environmental and Occupational HealthGeneral MedicineOdds ratioMiddle AgedOverweightoverweight/obesitymedicine.diseaseObesityConfidence intervalmultilevel modelLogistic ModelsItalySocial ClassMultilevel AnalysisFemalemedicine.symptomSedentary BehaviorbusinessSESBody mass indexDemography
researchProduct