Pub Date : 2021-11-24DOI: 10.1109/urucon53396.2021.9647355
G. Casaravilla, R. Chaer, Ximena Caporale
This paper analyzes the difficulties that power generation investment planners face working in the BANI context. Electricity generation systems are fragile, non-linear, with random components and at times incomprehensible, which makes up the BANI context. This context generates a climate of anxiety for the planner, both for making decisions and for not making them, but more than anything for not knowing how and who will evaluate their work in the future by observing the chronicle of events that have occurred from the wide set of possible chronicles. A concrete example and the consequences of a risk-averse planner not adopting best practices are analyzed in order to mitigate possible future criticism of his work.
{"title":"Generation Investment Planning and Risk Management in BANI context","authors":"G. Casaravilla, R. Chaer, Ximena Caporale","doi":"10.1109/urucon53396.2021.9647355","DOIUrl":"https://doi.org/10.1109/urucon53396.2021.9647355","url":null,"abstract":"This paper analyzes the difficulties that power generation investment planners face working in the BANI context. Electricity generation systems are fragile, non-linear, with random components and at times incomprehensible, which makes up the BANI context. This context generates a climate of anxiety for the planner, both for making decisions and for not making them, but more than anything for not knowing how and who will evaluate their work in the future by observing the chronicle of events that have occurred from the wide set of possible chronicles. A concrete example and the consequences of a risk-averse planner not adopting best practices are analyzed in order to mitigate possible future criticism of his work.","PeriodicalId":337257,"journal":{"name":"2021 IEEE URUCON","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132891028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-11-24DOI: 10.1109/urucon53396.2021.9647082
Facundo Lezama, Gastón García González, Federico Larroca, Germán Capdehourat
The topic of indoor localization is very relevant today as it provides solutions in different applications (e.g. shopping malls or museums). We consider here the so-called Wi-Fi fingerprinting approach, where RSSI measurements from the access points are used to locate the device into certain predefined areas. Typically, this mapping from measurements to area is obtained by training a machine learning algorithm. However, traditional techniques do not take into account the underlying geometry of the problem. We thus investigate here a novel approach: using machine learning techniques in graphs, in particular Graph Neural Networks. We propose a way to construct the graph using only the RSSI measurements (and not the floor plan) and evaluate the resulting algorithm on two real datasets. The results are very encouraging, showing a better performance than existing methods, in some cases even using a much smaller amount of training data.
{"title":"Indoor Localization using Graph Neural Networks","authors":"Facundo Lezama, Gastón García González, Federico Larroca, Germán Capdehourat","doi":"10.1109/urucon53396.2021.9647082","DOIUrl":"https://doi.org/10.1109/urucon53396.2021.9647082","url":null,"abstract":"The topic of indoor localization is very relevant today as it provides solutions in different applications (e.g. shopping malls or museums). We consider here the so-called Wi-Fi fingerprinting approach, where RSSI measurements from the access points are used to locate the device into certain predefined areas. Typically, this mapping from measurements to area is obtained by training a machine learning algorithm. However, traditional techniques do not take into account the underlying geometry of the problem. We thus investigate here a novel approach: using machine learning techniques in graphs, in particular Graph Neural Networks. We propose a way to construct the graph using only the RSSI measurements (and not the floor plan) and evaluate the resulting algorithm on two real datasets. The results are very encouraging, showing a better performance than existing methods, in some cases even using a much smaller amount of training data.","PeriodicalId":337257,"journal":{"name":"2021 IEEE URUCON","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132065639","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-11-24DOI: 10.1109/urucon53396.2021.9647229
Santiago Bacelar, Rocio Curiel, Santiago Vanoli, María Agustina Pérez, Francisco Veirano, Pablo Pérez-Nicoli
Although the use of technology, e.g., personal computers and smartphones, is essential in nowadays world, many users do not have enough motor skills to use them fluently. The commercially available assistive technology is expensive, compared to the conventional one, and many of these devices have limited configurability also limiting the number of users who can benefit from them. This paper addresses the design and prototype implementation of a plug & play mouse that can be used in four configurable modes in order to meet different users' requirements. The proposed mouse characteristics and prototype price is compared to various commercial devices proving the potential of the proposed solution.
{"title":"Assistive technology: A multimodal interface to control PC mouse pointer and click","authors":"Santiago Bacelar, Rocio Curiel, Santiago Vanoli, María Agustina Pérez, Francisco Veirano, Pablo Pérez-Nicoli","doi":"10.1109/urucon53396.2021.9647229","DOIUrl":"https://doi.org/10.1109/urucon53396.2021.9647229","url":null,"abstract":"Although the use of technology, e.g., personal computers and smartphones, is essential in nowadays world, many users do not have enough motor skills to use them fluently. The commercially available assistive technology is expensive, compared to the conventional one, and many of these devices have limited configurability also limiting the number of users who can benefit from them. This paper addresses the design and prototype implementation of a plug & play mouse that can be used in four configurable modes in order to meet different users' requirements. The proposed mouse characteristics and prototype price is compared to various commercial devices proving the potential of the proposed solution.","PeriodicalId":337257,"journal":{"name":"2021 IEEE URUCON","volume":"39 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128877857","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-11-24DOI: 10.1109/urucon53396.2021.9647160
Gabriel Polvani, Victor Croisfelt, T. Abrão
In this work, we propose a demodulator aided by a neural network (NN) for massive multiple-input multiple-output (M-MIMO) systems. In particular, we consider the uplink (UL) phase of an M-MIMO system in which users transmit utilizing a quadrature amplitude modulation (QAM) and soft-estimates are obtained via the application of the zero-forcing (ZF) combiner. Based on the ZF soft-estimates, we propose suitable features that are used in the input layer of an NN, whose task is to learn how to output hard-estimates, that is, demodulate the ZF soft-estimates. We then adopt a supervised learning perspective by performing a regression analysis and training the NN with simulated data. The performance and complexity of our NN-aided demodulator is numerically compared to those of the hard-decisor (HD) scheme used as a benchmark for a 4-QAM. Through this comparison, we show that our NN-aided demodulator is 17.3% more computationally efficient with tolerable performance losses. We argue that demodulators assisted by NNs can be a promising alternative to cheaply demodulate high-order OAMs.
{"title":"Massive MIMO Demodulation Aided by NN","authors":"Gabriel Polvani, Victor Croisfelt, T. Abrão","doi":"10.1109/urucon53396.2021.9647160","DOIUrl":"https://doi.org/10.1109/urucon53396.2021.9647160","url":null,"abstract":"In this work, we propose a demodulator aided by a neural network (NN) for massive multiple-input multiple-output (M-MIMO) systems. In particular, we consider the uplink (UL) phase of an M-MIMO system in which users transmit utilizing a quadrature amplitude modulation (QAM) and soft-estimates are obtained via the application of the zero-forcing (ZF) combiner. Based on the ZF soft-estimates, we propose suitable features that are used in the input layer of an NN, whose task is to learn how to output hard-estimates, that is, demodulate the ZF soft-estimates. We then adopt a supervised learning perspective by performing a regression analysis and training the NN with simulated data. The performance and complexity of our NN-aided demodulator is numerically compared to those of the hard-decisor (HD) scheme used as a benchmark for a 4-QAM. Through this comparison, we show that our NN-aided demodulator is 17.3% more computationally efficient with tolerable performance losses. We argue that demodulators assisted by NNs can be a promising alternative to cheaply demodulate high-order OAMs.","PeriodicalId":337257,"journal":{"name":"2021 IEEE URUCON","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126790593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-11-24DOI: 10.1109/urucon53396.2021.9647343
Daniel Crepaldo, F. Pacher, Eduardo Bailón, M. Schiavon
Printed electronics encompasses the set of printing methods with special inks used to create electrical devices on various substrates. It emerges as a technological alternative for the implementation of electronic circuits at relatively low cost with almost immediate availability. Basic research in new inks and substrates is in permanent development, thus the way for accessible applications both in existing and recently emerging sectors are now enabled. In this work, the possibilities of printed electronics based on low cost 3D printing are explored. Also, as a first step, measurement of conductive material characteristics is presented.
{"title":"Material characterization for using in low-cost printed electronics","authors":"Daniel Crepaldo, F. Pacher, Eduardo Bailón, M. Schiavon","doi":"10.1109/urucon53396.2021.9647343","DOIUrl":"https://doi.org/10.1109/urucon53396.2021.9647343","url":null,"abstract":"Printed electronics encompasses the set of printing methods with special inks used to create electrical devices on various substrates. It emerges as a technological alternative for the implementation of electronic circuits at relatively low cost with almost immediate availability. Basic research in new inks and substrates is in permanent development, thus the way for accessible applications both in existing and recently emerging sectors are now enabled. In this work, the possibilities of printed electronics based on low cost 3D printing are explored. Also, as a first step, measurement of conductive material characteristics is presented.","PeriodicalId":337257,"journal":{"name":"2021 IEEE URUCON","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126356666","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-11-24DOI: 10.1109/urucon53396.2021.9647183
Rodrigo M. Schierloh, J. Godoy, F. Vincitorio, J. R. Vega
Simulación y Análisis de Fallas Eléctricas en una Microrred Aislada con Integración de Generación Fotovoltaica y Almacenamiento en Baterías
光伏发电与蓄电池集成的隔离微电网电气故障仿真与分析
{"title":"Simulación y Análisis de Fallas Eléctricas en una Microrred Aislada con Integración de Generación Fotovoltaica y Almacenamiento en Baterías","authors":"Rodrigo M. Schierloh, J. Godoy, F. Vincitorio, J. R. Vega","doi":"10.1109/urucon53396.2021.9647183","DOIUrl":"https://doi.org/10.1109/urucon53396.2021.9647183","url":null,"abstract":"Simulación y Análisis de Fallas Eléctricas en una Microrred Aislada con Integración de Generación Fotovoltaica y Almacenamiento en Baterías","PeriodicalId":337257,"journal":{"name":"2021 IEEE URUCON","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116637981","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-11-24DOI: 10.1109/urucon53396.2021.9647356
{"title":"Special Session: How to Create a Holistic Strategy to AI?","authors":"","doi":"10.1109/urucon53396.2021.9647356","DOIUrl":"https://doi.org/10.1109/urucon53396.2021.9647356","url":null,"abstract":"","PeriodicalId":337257,"journal":{"name":"2021 IEEE URUCON","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124970899","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-11-24DOI: 10.1109/urucon53396.2021.9647322
Allan Navarro-Brenes, L. Chavarría-Zamora
This document presents a portable, high performance system for real-time image dehazing using the DCP algorithm. The software runs on a CPU-GPU heterogeneous environment in a development platform from NVIDIA with support for CUDA. Three different window sizes for the DCP algorithm were explored. These low values allow a high throughput and reduce the halo artifacts but results in low-luminosity frames which negatively impacts quality. To solve this, a gamma correction was introduced as a final stage. The coefficient for this filter can vary and is a value which can be manually modified with feedback from the users, depending on their preferences. The picture resolution utilized was $1280times 720$ pixels, which the system was able to process at a frame rate of 40 fps using a window size of 3. The image capture can come either from an USB camera or from a video file. The output can be store as a file or it can be wirelessly transmitted to a mobile device using the RTP protocol.
{"title":"Implementation of a high-performance portable real-time dehazing system using the DCP algorithm","authors":"Allan Navarro-Brenes, L. Chavarría-Zamora","doi":"10.1109/urucon53396.2021.9647322","DOIUrl":"https://doi.org/10.1109/urucon53396.2021.9647322","url":null,"abstract":"This document presents a portable, high performance system for real-time image dehazing using the DCP algorithm. The software runs on a CPU-GPU heterogeneous environment in a development platform from NVIDIA with support for CUDA. Three different window sizes for the DCP algorithm were explored. These low values allow a high throughput and reduce the halo artifacts but results in low-luminosity frames which negatively impacts quality. To solve this, a gamma correction was introduced as a final stage. The coefficient for this filter can vary and is a value which can be manually modified with feedback from the users, depending on their preferences. The picture resolution utilized was $1280times 720$ pixels, which the system was able to process at a frame rate of 40 fps using a window size of 3. The image capture can come either from an USB camera or from a video file. The output can be store as a file or it can be wirelessly transmitted to a mobile device using the RTP protocol.","PeriodicalId":337257,"journal":{"name":"2021 IEEE URUCON","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131220290","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-11-24DOI: 10.1109/urucon53396.2021.9647289
Fellipe Sola, H. Hernández, W. Van Noije
The design of a fully integrated LC voltage-controlled oscillator (VCO) based on a cross-coupled pair with a current reuse approach and a bulk bias methodology is presented in this paper. The proposed circuit reduces the oscillator transconductance variations related to temperature and process variation even operating at 1V of supply voltage. This circuit was designed and simulated in 180nm CMOS technology consuming 1.2mW with −92 dBc/Hz of phase noise (PN) at 1 MHz from the carrier and tuning range from 4.78 to 5.04 GHz (5.2%). The chip is being produced and experimental results will be available soon.
{"title":"A Bulk Bias 1V 5GHz Low Power LC VCO with transconductance stabilization","authors":"Fellipe Sola, H. Hernández, W. Van Noije","doi":"10.1109/urucon53396.2021.9647289","DOIUrl":"https://doi.org/10.1109/urucon53396.2021.9647289","url":null,"abstract":"The design of a fully integrated LC voltage-controlled oscillator (VCO) based on a cross-coupled pair with a current reuse approach and a bulk bias methodology is presented in this paper. The proposed circuit reduces the oscillator transconductance variations related to temperature and process variation even operating at 1V of supply voltage. This circuit was designed and simulated in 180nm CMOS technology consuming 1.2mW with −92 dBc/Hz of phase noise (PN) at 1 MHz from the carrier and tuning range from 4.78 to 5.04 GHz (5.2%). The chip is being produced and experimental results will be available soon.","PeriodicalId":337257,"journal":{"name":"2021 IEEE URUCON","volume":"142 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133258925","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-11-24DOI: 10.1109/urucon53396.2021.9647064
H. de Souza, L. Trigo, D. Slomovitz
The maintenance of the National dc Voltage Standard of Uruguay is carried out by means of electronic sources based on Zeners. As they are not primary standards, it is necessary to send them to National Metrology Institutes abroad. As these trips are a problem, a very stable source was developed to extend the calibration period. This paper describes the evolution of a 10-V dc Zener standard, developed in 2005, and continuously observed up to now. An automatic system compares the outputs of this standard with other similar one and conventional commercial Zener standards. During all this period, five comparisons were done against Josephson standards, the last one in 2019. Exceptionally stability has been observed, as it is shown in this work.
{"title":"An Ultra Stable Zener Voltage Standard - Fifteen Years of Surveillance","authors":"H. de Souza, L. Trigo, D. Slomovitz","doi":"10.1109/urucon53396.2021.9647064","DOIUrl":"https://doi.org/10.1109/urucon53396.2021.9647064","url":null,"abstract":"The maintenance of the National dc Voltage Standard of Uruguay is carried out by means of electronic sources based on Zeners. As they are not primary standards, it is necessary to send them to National Metrology Institutes abroad. As these trips are a problem, a very stable source was developed to extend the calibration period. This paper describes the evolution of a 10-V dc Zener standard, developed in 2005, and continuously observed up to now. An automatic system compares the outputs of this standard with other similar one and conventional commercial Zener standards. During all this period, five comparisons were done against Josephson standards, the last one in 2019. Exceptionally stability has been observed, as it is shown in this work.","PeriodicalId":337257,"journal":{"name":"2021 IEEE URUCON","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134090800","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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