1,721,072 research outputs found
Underwater Acoustic Modems
Full text link© 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.Due to the growing interest using underwater acoustic networks, there are more and more research papers about underwater communications. These papers are mainly focused on deployments and studies about the constraints of the underwater medium. The underwater acoustic channel is highly variable and the signal transmission can change according to environmental factors such as the temperature, pressure or salinity of the water. For this reason, it is important to know how these devices are developed and the maximum distance and data transfer rates they can achieve. To this end, this paper presents an exhaustive study of existing underwater acoustic modems where their main features are highlighted. We also review the main features of their hardware. All presented proposals in the research literature are compared with commercial underwater acoustic modems. Finally, we analyze different programs and improvements of existing network simulators that are often used to simulate and estimate the behavior of underwater networks.This work was supported by the Ministerio de Ciencia e Innovacion through the Plan Nacional de I+D+i 2008-2011 within the Subprograma de Proyectos de Investigacion Fundamental under Project TEC2011-27516. The associate editor coordinating the review of this paper and approving it for publication was Dr. Lei Shu. (Corresponding author: Jaime Lloret.)Sendra, Sandra;Lloret, Jaime;Jimenez, Jose M.;Parra-Boronat, L. (2015). Underwater Acoustic Modems. IEEE Sensors Journal. 16(11):4063-4071. https://doi.org/10.1109/JSEN.2015.2434890S40634071161
Optimizing IoT network lifetime through an enhanced hybrid energy harvesting system
No full text[EN] The growing need for sustainable and renewable energy sources has become critical with the Internet of Things (IoT) advancement. IoT relies on low-power, battery-operated devices, but the limited lifespan of these batteries requires frequent recharging or replacement, which is costly and time-consuming. Researchers have proposed energy harvesting systems that capture sustainable ambient energy from the environment to address this issue. This paper presents a hybrid system for harvesting sustainable energy from solar and wind sources. The system features a boost converter controlled by a novel hybrid method combining the Honey Badger Algorithm (HBA) and Harris Hawks Optimization (HHO). This method maximizes power extraction from solar and wind sources, enhancing overall system efficiency. Additionally, the system includes an innovative energy management algorithm that selects the most powerful input source while protecting the storage battery from overcharging or complete depletion, thereby extending its lifespan. The proposed design is validated through MATLAB/Simulink simulations. The HHO-HBA MPPT is compared with existing MPPT methods, evaluating efficiency, battery charge curves, and IoT network energy status. Simulation results show that the proposed approach significantly increases network longevity, offering a cost-effective and sustainable solution for the energy needs of Wireless Sensor Network (WSN)-IoT devices.Rabah, S.;Zaier, A.;Sendra, Sandra;Lloret, Jaime;Dahman, H. (2025). Optimizing IoT network lifetime through an enhanced hybrid energy harvesting system. Sustainable Computing: Informatics and Systems. 46. https://doi.org/10.1016/j.suscom.2025.101081S4
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
An edge computing wireless sensor network for diagnosing orange fruit disease
No full text[EN] This study introduces an innovative Edge Computing Wireless Sensor Network and Designing a new algorithm for diagnosing orange fruit diseases. The network combines Raspberry Pi using wireless technologies like Zigbee and LoRa with Wireless Mesh Routers using Wireless Technologies like LoRa and Cellular technologies. By using a new system that includes a YOLOv8 model and an image processing algorithm that detects the color spectrum of the diseased part of the fruit, it is possible to quickly identify certain diseases, such as canker, black spot, and melanosis. The system achieves a high accuracy of 92.2% in disease detection. This cost-effective and efficient solution offers farmers a practical tool for early disease detection, enabling timely interventions to protect crops and improve overall agricultural outcomes. In this study, in connection with the proposed algorithm, 97 images of diseased orange fruit, including Canker, melanosis, and black spot, as well as healthy oranges have been tested. It has also been tested in an orange orchard. The proposed new model successfully identified orange black spot disease with 30 correct detections out of 32 images and 2 errors, melanosis disease with 18 correct detections out of 21 images and 3 errors, canker disease with 9 correct detections out of 11 images and 2 errors, and 33 images of healthy oranges fruits with 100% accuracy. The Python codes for the proposed model and the dataset used in this study are available in a GitHub repository and accessible to the public.Ministerio de Ciencia e Innovacion, PID2020114467RRC33/AEI/https://doi.org/10.13039/501100011033,PID2020-114467RRC33/AEI/10.13039/501100011033,PID2020-114467RRC33/AEI/10.13039/501100011033,PID2020-114467RRC33/AEI/10.13039/501100011033, Ministerio de Economia y Competitividad, Spain, TED2021-131040BC31, TED2021-131040BC31, TED2021-131040BC31, TED2021-131040BC31Foroughi, A.;Lloret, Jaime;Jimenez, Jose M.;Sendra, Sandra (2025). An edge computing wireless sensor network for diagnosing orange fruit disease. Cluster Computing. 28(5). https://doi.org/10.1007/s10586-024-04999-yS28
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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