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Author (up) Carrasco, M.; Alvarez, F.; Velazquez, R.; Concha, J.; Perez-Cotapos, F. doi  openurl
  Title Brush-Holder Integrated Load Sensor Prototype for SAG Grinding Mill Motor Type
  Year 2019 Publication Electronics Abbreviated Journal Electronics  
  Volume 8 Issue 11 Pages 14 pp  
  Keywords electrical motor sensor; SAG grinding mill motor; inspection protocol; mining industry  
  Abstract One of the most widely used electro-mechanical systems in large-scale mining is the electric motor. This device is employed in practically every phase of production. For this reason, it needs to be inspected regularly to maintain maximum operability, thus avoiding unplanned stoppages. In order to identify potential faults, regular check-ups are performed to measure the internal parameters of the components, especially the brushes and brush-holders. Both components must be properly aligned and calibrated to avoid electric arcs to the internal insulation of the motor. Although there is an increasing effort to improve inspection tasks, most inspection procedures are manual, leading to unnecessary costs in inspection time, errors in data entry, and, in extreme cases, measurement errors. This research presents the design, development, and assessment of an integrated measurement prototype for measuring spring tension and other key parameters in brush-holders used in electric motors. It aims to provide the mining industry with a new, fully automatic inspection system that will facilitate maintenance and checking. Our development research was carried out specifically on the brush system of a SAG grinding mill motor. These machines commonly use SIEMENS motors; however, the instrument can be easily adapted to any motor by simply changing the physical dimensions of the prototype.  
  Address [Carrasco, Miguel; Concha, Javier; Perez-Cotapos, Francisco] Univ Adolfo Ibanez, Fac Ingn & Ciencias, Av Diagonal Las Torres 20700, Santiago 7941169, Chile, Email: miguel.carrasco@uai.cl;  
  Corporate Author Thesis  
  Publisher Mdpi Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 2079-9292 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000502269500023 Approved  
  Call Number UAI @ eduardo.moreno @ Serial 1066  
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Author (up) Carrasco, M.; Alvarez, F.; Velazquez, R.; Concha, J.; Perez-Cotapos, I. pdf  doi
openurl 
  Title Inline Force Sensor Development for Electrical Motors for Mining Operations in Chile: A New Inspection Protocol Type
  Year 2018 Publication Ieee Latin America Transactions Abbreviated Journal IEEE Latin Am. Trans.  
  Volume 16 Issue 1 Pages 66-74  
  Keywords electrical motor sensor; SAG grinding drill motor; inspection protocol  
  Abstract Electric motors are among the most widely used electro-mechanical systems in the mining industry in Chile. As they are physically present in virtually all phases of the production process, they must be regularly inspected. In order to maintain a maximum level of operability and to avoid the occurrence of catastrophic failures and unscheduled stoppages, regular, planned reviews to measure the internal parameters of their components are performed manually. This part of the process presents serious shortcomings, such as significant inspection times, information input errors and, in some cases, measurement errors resulting from the technical difficulty of physically taking the measurement. This research presents the design, development and evaluation of a new sensor to support the inspection of brush-holder spring tensions as well as the integration of a digital gauge to control other critical dimensions of the brush-holder mounting. Its purpose is to provide the mining industry with a new system and a fully automated inspection protocol to ease maintenance and control tasks, particularly focusing on reducing inspection times. These products are expected to increase the equipment operating life, as well as delivering a maintenance report of the motor's key parameters which directly benefits the Key Performance Indicators (KPI) of mining management  
  Address [Carrasco, M.; Concha, J.; Perez-Cotapos, I.] Univ Adolfo Ibanez, Fac Ingn & Ciencias, Av Diagonal Torres 2700, Penalolen, Santigo, Chile, Email: miguel.carrasco@uai.cl;  
  Corporate Author Thesis  
  Publisher Ieee-Inst Electrical Electronics Engineers Inc Place of Publication Editor  
  Language Portuguese Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1548-0992 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000425326100012 Approved  
  Call Number UAI @ eduardo.moreno @ Serial 834  
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Author (up) Carrasco, M.; Mery, D.; Concha, A.; Velazquez, R.; De Fazio, R.; Visconti, P. doi  openurl
  Title An Efficient Point-Matching Method Based on Multiple Geometrical Hypotheses Type
  Year 2021 Publication Electronics Abbreviated Journal Electronics  
  Volume 10 Issue 3 Pages 246  
  Keywords computer vision; correspondence problem; fundamental matrix; multiple view geometry; point matching; trifocal tensor  
  Abstract Point matching in multiple images is an open problem in computer vision because of the numerous geometric transformations and photometric conditions that a pixel or point might exhibit in the set of images. Over the last two decades, different techniques have been proposed to address this problem. The most relevant are those that explore the analysis of invariant features. Nonetheless, their main limitation is that invariant analysis all alone cannot reduce false alarms. This paper introduces an efficient point-matching method for two and three views, based on the combined use of two techniques: (1) the correspondence analysis extracted from the similarity of invariant features and (2) the integration of multiple partial solutions obtained from 2D and 3D geometry. The main strength and novelty of this method is the determination of the point-to-point geometric correspondence through the intersection of multiple geometrical hypotheses weighted by the maximum likelihood estimation sample consensus (MLESAC) algorithm. The proposal not only extends the methods based on invariant descriptors but also generalizes the correspondence problem to a perspective projection model in multiple views. The developed method has been evaluated on three types of image sequences: outdoor, indoor, and industrial. Our developed strategy discards most of the wrong matches and achieves remarkable F-scores of 97%, 87%, and 97% for the outdoor, indoor, and industrial sequences, respectively.  
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  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 2079-9292 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000614991900001 Approved  
  Call Number UAI @ alexi.delcanto @ Serial 1341  
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Author (up) Carrasco, M.; Toledo, PA.; Velazquez, R.; Bruno, OM. doi  openurl
  Title Automatic Stomatal Segmentation Based on Delaunay-Rayleigh Frequency Distance Type
  Year 2020 Publication Plants-Basel Abbreviated Journal Plants-Basel  
  Volume 9 Issue 11 Pages 1613  
  Keywords stomatal segmentation; image segmentation; Delaunay-Rayleigh frequency  
  Abstract The CO2 and water vapor exchange between leaf and atmosphere are relevant for plant physiology. This process is done through the stomata. These structures are fundamental in the study of plants since their properties are linked to the evolutionary process of the plant, as well as its environmental and phytohormonal conditions. Stomatal detection is a complex task due to the noise and morphology of the microscopic images. Although in recent years segmentation algorithms have been developed that automate this process, they all use techniques that explore chromatic characteristics. This research explores a unique feature in plants, which corresponds to the stomatal spatial distribution within the leaf structure. Unlike segmentation techniques based on deep learning tools, we emphasize the search for an optimal threshold level, so that a high percentage of stomata can be detected, independent of the size and shape of the stomata. This last feature has not been reported in the literature, except for those results of geometric structure formation in the salt formation and other biological formations.  
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  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 2223-7747 ISBN Medium  
  Area Expedition Conference  
  Notes Approved  
  Call Number UAI @ alexi.delcanto @ Serial 1273  
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Author (up) Varona, J.; De Fazio, R.; Velazquez, R.; Giannoccaro, N.I.; Carrasco, M.; Visconti, P. openurl 
  Title MEMS-based Micro-scale Wind Turbines as Energy Harvesters of the Convective Airflows in Microelectronic Circuits Type
  Year 2020 Publication International Journal Of Renewable Energy Research Abbreviated Journal Int. J. Renew. Energy. Res.  
  Volume 10 Issue 3 Pages 1213-1225  
  Keywords Energy harvesting; micro-electro-mechanical system (MEMS); micro-turbine; silicon-based fabrication process  
  Abstract As an alternative to conventional batteries and other energy scavenging techniques, this paper introduces the idea of using micro-turbines to extract energy from wind forces at the microscale level and to supply power to battery-less microsystems. Fundamental research efforts on the design, fabrication, and test of micro-turbines with blade lengths of just 160 μm are presented in this paper along with analytical models and preliminary experimental results. The proof-of-concept prototypes presented herein were fabricated using a standard polysilicon surface micro-machining silicon technology (PolyMUMPs) and could effectively transform the kinetic energy of the available wind into a torque that might drive an electric generator or directly power supply a micro-mechanical system. Since conventional batteries do not scale-down well to the microscale, wind micro-turbines have the potential for becoming a practical alternative power source for microsystems, as well as for extending the operating range of devices running on batteries.  
  Address [Varona, J.; Velazquez, R.] Univ Panamer, Fac Ingn, Aguascalientes 20290, Aguascalientes, Mexico, Email: jvarona@up.edu.mx;  
  Corporate Author Thesis  
  Publisher Int Journal Renewable Energy Research Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1309-0127 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000575124800016 Approved  
  Call Number UAI @ alexi.delcanto @ Serial 1249  
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Author (up) Velazquez, R.; Pissaloux, E.; Rodrigo, P.; Carrasco, M.; Giannoccaro, N.I.; Lay-Ekuakille, A. doi  openurl
  Title An Outdoor Navigation System for Blind Pedestrians Using GPS and Tactile-Foot Feedback Type
  Year 2018 Publication Applied Sciences-Basel Abbreviated Journal Appl. Sci.-Basel  
  Volume 8 Issue 4 Pages 15 pp  
  Keywords assistive technology; blind pedestrian; GPS localization; mobile computing; navigational system; tactile display; tactile-foot stimulation; wearable system  
  Abstract This paper presents a novel, wearable navigation system for visually impaired and blind pedestrians that combines a global positioning system (GPS) for user outdoor localization and tactile-foot stimulation for information presentation. Real-time GPS data provided by a smartphone are processed by dedicated navigation software to determine the directions to a destination. Navigational directions are then encoded as vibrations and conveyed to the user via a tactile display that inserts into the shoe. The experimental results showed that users were capable of recognizing with high accuracy the tactile feedback provided to their feet. The preliminary tests conducted in outdoor locations involved two blind users who were guided along 380-420 m predetermined pathways, while sharing the space with other pedestrians and facing typical urban obstacles. The subjects successfully reached the target destinations. The results suggest that the proposed system enhances independent, safe navigation of blind pedestrians and show the potential of tactile-foot stimulation in assistive devices.  
  Address [Velazquez, Ramiro; Rodrigo, Pedro] Univ Panamericana, Fac Engn, Aguascalientes 20290, Mexico, Email: rvelazquez@up.edu.mx;  
  Corporate Author Thesis  
  Publisher Mdpi Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 2076-3417 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000434996400105 Approved  
  Call Number UAI @ eduardo.moreno @ Serial 880  
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