Article
Chemistry, Analytical
Francois-Marie Manicacci, Johann Mourier, Chabi Babatounde, Jessica Garcia, Mickael Broutta, Jean-Sebastien Gualtieri, Antoine Aiello
Summary: This study presents a novel underwater positioning system that utilizes TDOA algorithm and GSM communication technology to achieve real-time tracking of marine organisms. The system performs similarly to traditional acoustic systems and can be deployed in various environments for monitoring different species.
Article
Chemistry, Analytical
Yuhan Li, Ruizhi Ruan, Zupeng Zhou, Anqing Sun, Xiaonan Luo
Summary: This paper proposes a novel method for dynamically positioning an unmanned underwater vehicle (UUV) with unknown trajectories using an autonomous tracking buoy (PUVV-ATB) and ultra-short baseline measurements. The method utilizes a spatial location geometric model and divides the positioning process into four steps, including data preprocessing, direction capture, position tracking, and position synchronization. A new adaptive tracking control algorithm is introduced, which eliminates the need for trajectory prediction and is applied to the last three steps. The algorithm is implemented on the buoy for tracking simulation and sea trial experiments, demonstrating improved stability and precise tracking performance with a positioning error of less than 10 cm. This method breaks the assumption of trajectory prediction in traditional tracking control algorithms, providing a new direction for further research on UUV localization. Additionally, the conclusions of this paper have valuable reference for other UUV-related research and applications.
Article
Acoustics
Cristian Graupe, Lora J. Van Uffelen, Peter F. Worcester, Matthew A. Dzieciuch, Bruce M. Howe
Summary: An automated method is developed to align underwater acoustic receptions with a long range acoustic prediction in order to determine source-receiver range. The method is demonstrated using acoustic receptions collected by autonomous underwater vehicles in the Philippine Sea. The results show that the automated method provides accurate range estimates compared to manual acoustic arrival matching.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2022)
Article
Computer Science, Artificial Intelligence
Nicolas Souli, Panayiotis Kolios, Georgios Ellinas
Summary: This paper proposes an online technique that combines signals-of-opportunity and inertial measurements for the positioning and navigation of unmanned aerial vehicles (UAVs). The technique is able to estimate the position in real-time when GNSS signals are not available, and improves tracking accuracy through the use of inertial measurements.
IEEE TRANSACTIONS ON INTELLIGENT VEHICLES
(2022)
Article
Engineering, Marine
Tu Lv, Mingjun Zhang, Yujia Wang
Summary: This paper proposes a prediction-based region tracking control scheme for an autonomous underwater vehicle (AUV) to solve the problems of overshoot and high energy consumption. By predicting the future position of AUV and the outer boundary of the desired region, the controller is designed accordingly. Furthermore, an optimization scheme considering the desired region is proposed to address the output saturation issue.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Marine
Hao Feng, Jiancheng Yu, Yan Huang, Jianan Qiao, Zhenyu Wang, Zongbo Xie, Kai Liu
Summary: The study proposes a method for detecting and tracking the thermocline using an AUV, which ensures coverage of the target thermocline over time and space through adaptive control. By evaluating the vertical thermocline distribution online, the method achieves coverage observation of a water column with multiple thermoclines.
Article
Engineering, Marine
Zheyuan Wu, Qing Wang, Haocai Huang
Summary: This paper investigates a low-complexity tracking control method for autonomous underwater helicopters (AUH) without using nonlinear approximation strategies. It aims to ensure efficiency and high accuracy in dealing with environmental disturbances and modeling uncertainty. The introduction of Nussbaum function and shifting function solves the problem of unknown control direction and initial condition of system error. Additionally, an incremental event-triggered control mechanism with two thresholds is added to reduce the update rate of the controller and the mechanical loss of the thruster. Simulation results on AUHs demonstrate the effectiveness of the proposed scheme.
Article
Engineering, Civil
Yukiyasu Noguchi, Toshihiro Maki
Summary: This article introduces a method for tracking underwater structures using an AUV, based on stochastic means and utilizing commercial off-the-shelf sensors. It is suitable for surveying various underwater structures and is applicable to fast moving vehicles. The method has been successfully tested in both sea and tank environments, demonstrating its effectiveness in tracking rugged seafloors and vertical walls.
IEEE JOURNAL OF OCEANIC ENGINEERING
(2021)
Article
Engineering, Civil
Artur Wolek, James McMahon, Benjamin R. Dzikowicz, Brian H. Houston
Summary: This article describes the development and testing of a passive sonar, multitarget tracker, and adaptive behavior that enable an autonomous underwater vehicle (AUV) to detect and actively track nearby surface vessels. By repurposing a planar hull-mounted hydrophone array, the AUV can gather acoustic data and estimate the position and velocity of targets using a particle filter tracker. The tracking system is demonstrated through at-sea experiments.
IEEE JOURNAL OF OCEANIC ENGINEERING
(2022)
Article
Geochemistry & Geophysics
Sibo Sun, Huigong Guo, Guangming Wan, Chao Dong, Ce Zheng, Yong Wang
Summary: This article proposes a new path-planning algorithm based on the improved artificial potential field (APF) to improve the localization precision of underwater acoustic localization (UWAL) for a sunken airplane. By modifying the conventional gravitation force and introducing a new localization precision force, a balance between localization precision and obstacle avoidance is achieved, resulting in significantly improved localization precision. The effectiveness of the proposed method is validated through lake trial results.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2023)
Article
Robotics
Yingqiang Wang, Ruoyu Hu, S. H. Huang, Zhikun Wang, Peizhou Du, Wencheng Yang, Ying Chen
Summary: Underwater positioning is crucial for navigation and geo-referencing of AUVs. Traditional methods like GPS are not feasible in underwater environments, leading to the importance of acoustic methods like USBL positioning systems. However, the high cost and complexity of classical USBL systems hinder their widespread adoption, which is addressed by the piUSBL positioning method.
IEEE ROBOTICS AND AUTOMATION LETTERS
(2022)
Review
Ecology
Robert J. Lennox, Kim Aarestrup, Josep Alos, Robert Arlinghaus, Eneko Aspillaga, Michael G. Bertram, Kim Birnie-Gauvin, Tomas Brodin, Steven J. Cooke, Lotte S. Dahlmo, Felicie Dhellemmes, Karl o. Gjelland, Gustav Hellstrom, Henry Hershey, Christopher Holbrook, Thomas Klefoth, Susan Lowerre-Barbieri, Christopher T. Monk, Cecilie Iden Nilsen, Ine Pauwels, Renanel Pickholtz, Marie Prchalova, Jan Reubens, Milan Riha, David Villegas-Rios, Knut Wiik Vollset, Samuel Westrelin, Henrik Baktoft
Summary: This paper provides an overview of the method of geolocating aquatic animals with acoustic tags, including considerations for designing receiver arrays, testing performance, synchronizing receiver clocks, and calculating positions from detection data. Common positioning algorithms, including open-source solvers and manufacturer-provided "black-box" methods, are also introduced. It is the first comprehensive overview of methods and considerations for designing and implementing better positioning studies in aquatic systems, aiming to support users and encourage further advances in knowledge.
METHODS IN ECOLOGY AND EVOLUTION
(2023)
Article
Engineering, Marine
Francesco Ruscio, Riccardo Costanzi, Nuno Gracias, Josep Quintana, Rafael Garcia
Summary: Monitoring is crucial for marine environment preservation. This research proposes a framework that enables an autonomous underwater vehicle equipped with a down-looking camera to inspect the boundary of Posidonia oceanica meadows. The proposed solution utilizes machine learning and computer vision techniques to achieve this task.
Article
Engineering, Marine
Jiaxiang Shi, Jianer Fang, Qizhong Zhang, Qiuxuan Wu, Botao Zhang, Farong Gao
Summary: This research proposes a model-free reinforcement learning algorithm for target tracking of autonomous underwater vehicles (AUVs). By utilizing the actor-critic framework and experience replay technique, the algorithm achieves quick and stable learning of target tracking tasks in various motion states, improving control performance.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Automation & Control Systems
Jing Yan, Zhiwen Guo, Xian Yang, Xiaoyuan Luo, Xinping Guan
Summary: This article focuses on the finite-time tracking control issue for AUV in a HOTL system, utilizing a cooperative tracking network with operator, buoys, AUV, and sensors. It includes a buoy-assisted localization estimator and a fast terminal sliding mode observer for finite-time velocity estimation, along with an adaptive-nonsingular fast terminal sliding mode tracking controller for driving AUV to the target point in finite time. The proposed solution improves convergence speed and reduces chattering by using signum and differential functions together.
IEEE TRANSACTIONS ON SYSTEMS MAN CYBERNETICS-SYSTEMS
(2022)
Article
Biotechnology & Applied Microbiology
Ana-Hermina Ghenu, Benjamin M. Bolker, Don J. Melnick, Ben J. Evans
Article
Ecology
Edgar J. Gonzalez, Carlos Martorell, Benjamin M. Bolker
METHODS IN ECOLOGY AND EVOLUTION
(2016)
Article
Biochemical Research Methods
Sang Woo Park, Benjamin M. Bolker
PLOS COMPUTATIONAL BIOLOGY
(2017)
Article
Ecology
Morgan P. Kain, Benjamin M. Bolker
Article
Ecology
Michael Li, Benjamin M. Bolker
Article
Infectious Diseases
David Champredon, Michael Li, Benjamin M. Bolker, Jonathan Dushoff
Letter
Multidisciplinary Sciences
Sang Woo Park, Jonathan Dushoff, David J. D. Earn, Hendrik Poinar, Benjamin M. Bolker
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2018)
Editorial Material
Ecology
Jonathan Dushoff, Morgan P. Kain, Benjamin M. Bolker
METHODS IN ECOLOGY AND EVOLUTION
(2019)
Article
Multidisciplinary Sciences
David J. D. Earn, Junling Ma, Hendrik Poinar, Jonathan Dushoff, Benjamin M. Bolker
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2020)
Article
Ecology
Nicholas A. W. Brown, Noah S. B. Houpt, Nicole L. Yee, Jennifer E. M. Curtis, Benjamin M. Bolker, Francis Juanes, Sigal Balshine
Summary: The study shows that different nesting sites have implications for the physiological costs for parents and developmental benefits for offspring in the plainfin midshipman fish. It is found that parents choosing low intertidal nests can effectively improve offspring survival and development rates, while high intertidal nests lead to faster offspring development but higher mortality rates.
JOURNAL OF ANIMAL ECOLOGY
(2021)
Letter
Multidisciplinary Sciences
Jonathan Dushoff, Caroline Colijn, David J. D. Earn, Benjamin M. Bolker
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Biology
Ali Gharouni, Fred M. Abdelmalek, David J. D. Earn, Jonathan Dushoff, Benjamin M. Bolker
Summary: Testing individuals for pathogens can affect the spread of epidemics, and the effectiveness of testing depends on factors such as testing intensity and focus. Intensive testing and fast test reporting can be beneficial at the community level, providing rapid assessment, hotspot identification, and contact tracing. The direct effects of fast testing at the individual level are less clear and may depend on individual behavior in response to testing information.
BULLETIN OF MATHEMATICAL BIOLOGY
(2022)
Article
Multidisciplinary Sciences
Michael W. McCoy, Elizabeth Hamman, Molly Albecker, Jeremy Wojdak, James R. Vonesh, Benjamin M. Bolker
Summary: Predicting the combined effects of independent predators on shared prey requires considering nonlinear factors to avoid biases. Historical failures to account for biases introduced by nonlinear processes suggest a need for reevaluation of the general conclusions about the ubiquity of emergent MPEs.
Article
Ecology
Max A. Moritz, Enric Batllori, Benjamin M. Bolker
Summary: Productivity and terrestrial species richness patterns are strongly correlated, but the role of fire in global diversity has been understudied. This study examines the sensitivity of terrestrial vertebrate biodiversity to fire, while considering other drivers. The findings reveal that fire has a significant positive association with bird and mammal diversity, rivaling the effects of productivity, while there are few clear associations for amphibians. These results highlight the underappreciated role of fire in shaping animal species richness and conserving global biodiversity.
Article
Multidisciplinary Sciences
Sang Woo Park, Benjamin M. Bolker, Sebastian Funk, C. Jessica E. Metcalf, Joshua S. Weitz, Bryan T. Grenfell, Jonathan Dushoff
Summary: Inferring the relative strength and speed of new SARS-CoV-2 variants is crucial for predicting and controlling the pandemic. Current analyses primarily focus on changes in variant proportions, but it is important to consider that relative speed and strength can vary over time and are influenced by different interventions. Neglecting differences in generation-interval distributions may lead to biased estimates of relative strength.
JOURNAL OF THE ROYAL SOCIETY INTERFACE
(2022)
Article
Ecology
Katja J. Geiger, Julio Arrontes, Antonella Rivera, Consolacion Fernandez, Jorge Alvarez, Jose Luis Acuna
Summary: A two-year experiment was conducted to investigate the impact of Pollicipes pollicipes harvest on intertidal community structure and ecological diversity. The study found that intensive exploitation resulted in a decrease in P. pollicipes and Mytilus spp. coverage, while Chthamalus spp. and Corallina spp. increased. The recovery of P. pollicipes aggregations was slow and variable, but their coverage increased under non-extracted conditions.
JOURNAL OF EXPERIMENTAL MARINE BIOLOGY AND ECOLOGY
(2024)
Article
Ecology
Daniel Castro Martignago, Leandro Godoy, Amanda Pereira Amaral, Guendalina Turcato Oliveira
Summary: This study evaluates the effects of bleaching on the oocytes of the Mussismilia harttii coral and investigates the strategies employed by these cells to maintain antioxidant balance and cellular homeostasis. The research finds that bleached coral oocytes experience lipid damage, but are still able to maintain their quality and potentially elongate their lifespan and fertilization capability. This response may be linked to an intensification of heterotrophy in bleached corals.
JOURNAL OF EXPERIMENTAL MARINE BIOLOGY AND ECOLOGY
(2024)