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Browsing by Type "proceedings-article"

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    PublicationOpen Access
    A Low-Cost IoT Platform for Heat Stress Monitoring in Dairy Cattle
    (IEEE, 2021-04-23)
    Choquehuanca Zevallos, Juan José  
    ;
    Mayhua López, Efraín Tito  
    This paper presents a compact and modular system based on Internet-of- Things for monitoring cattle behavior and stress in real-time. It will help to model certain parameters such as temperature and certain weather variables such as relative humidity, solar radiation, among others thanks to Internet-of- Things (IoT) sensors localized in different points of barns and the fields for cattle farming. A main benefit of the system is that it is built with low-cost hardware and low battery consumption. The wireless system also allows the collection of data in real-time and obtains the temperature-humidity index. This index will give an approach to the heat stress in cattle not only on the farm but in the vicinity of the farm. Finally, the high amount of collected data will allow employing Big Data solutions for estimating the impact on milk productivity. In the future, more sensors will be deployed for a more detailed reading of weather variables and their impact on dairy cattle.
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    PublicationOpen Access
    Broadband Microstrip Directional Coupler using capacitive compensation and matching networks
    (IEEE, 2022-08-11)
    Renato Torres-Quispe
    ;
    Zenteno Bolaños, Efrain José  
    High directivity and large bandwidth directional couplers are foreseen in future electronic systems. These devices are expected in measurement, monitoring, control and protection applications. In this work, a novel design methodology of a directional coupler using microstrip technology is proposed. This design is based on traditional coupled line theory enhanced with capacitive compensation and matching network. Using this methodology, a directional coupler is implemented in microstrip technology using FR4 substrate obtaining a large bandwidth (ranging from 1 GHz to 8 GHz) and a directivity better than 20 dB.
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    PublicationOpen Access
    Modular Low-cost RF Instrumentation to Detect Arsenic Ions in Water
    (IEEE, 2020-10-21)
    Wilbert Quispe-Huamani
    ;
    Zenteno Bolaños, Efrain José  
    This paper explores the development of a low-cost instrument using a similar architecture to a one-port vector receiver intended for estimating Arsenic (As) ions diluted in water. The instrument is implemented with modular off-the-shelf-components. The measurements are performed with the designed prototype connected to a dielectric assessment kit 3.5 from Schmidt Partner Engineering AG and are compared for different levels of Arsenic solved in water. The preliminary results obtained are promising to continue the study of this instrumentation and pave the way to develop further sensor and instrumentation for water-sensing and monitoring applications.
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    PublicationOpen Access
    Similarity-based visual exploration of very large georeferenced multidimensional datasets
    (ACM, 2019-04-08)
    Roger Peralta-Aranibar
    ;
    Cicero A. L. Pahins
    ;
    Joao L. D. Comba
    ;
    Gómez Nieto, Erick Mauricio  
    Big data visualization is a main task for data analysis. Due to its complexity in terms of volume and variety, very large datasets are unable to be queried for similarities among entries in traditional Database Management Systems. In this paper, we propose an effective approach for indexing millions of elements with the purpose of performing single and multiple visual similarity queries on multidimensional data associated with geographical locations. Our approach makes use of Z-Curve algorithm to map into 1D space considering similarities between data. Additionally, we present a set of results using real data of different sources and we analyze the insights obtained from the interactive exploration.
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