Relevant bibliographies by topics / Area Coverage Control

Academic literature on the topic 'Area Coverage Control'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Area Coverage Control"

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Phuphanin, Akkhachai, and Wipawee Usaha. "Scalarized Q Multi-Objective Reinforcement Learning for Area Coverage Control and Light Control Implementation." ECTI Transactions on Electrical Engineering, Electronics, and Communications 16, no. 2 (April 3, 2018): 72–82. http://dx.doi.org/10.37936/ecti-eec.2018162.171333.

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Coverage control is crucial for the deployment of wireless sensor networks (WSNs). However, most coverage control schemes are based on single objective optimization such as coverage area only, which do not consider other contradicting objectives such as energy consumption, the number of working nodes, wasteful overlapping areas. This paper proposes on a Multi-Objective Optimization (MOO) coverage control called Scalarized Q Multi-Objective Reinforcement Learning (SQMORL). The two objectives are to achieve the maximize area coverage and to minimize the overlapping area to reduce energy consumption. Performance evaluation is conducted for both simulation and multi-agent lighting control testbed experiments. Simulation results show that SQMORL can obtain more efficient area coverage with fewer working nodes than other existing schemes. The hardware testbed results show that SQMORL algorithm can find the optimal policy with good accuracy from the repeated runs.
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Papatheodorou, Sotiris, Anthony Tzes, Konstantinos Giannousakis, and Yiannis Stergiopoulos. "Distributed area coverage control with imprecise robot localization." International Journal of Advanced Robotic Systems 15, no. 5 (September 1, 2018): 172988141879749. http://dx.doi.org/10.1177/1729881418797494.

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This article examines the static area coverage problem by a network of mobile, sensor-equipped agents with imprecise localization. Each agent has uniform radial sensing ability and is governed by first-order kinodynamics. To partition the region of interest, a novel partitioning scheme, the Additively Weighted Guaranteed Voronoi diagram is introduced which takes into account both the agents’ positioning uncertainty and their heterogeneous sensing performance. Each agent’s region of responsibility corresponds to its Additively Weighted Guaranteed Voronoi cell, bounded by hyperbolic arcs. An appropriate gradient ascent-based control scheme is derived so that it guarantees monotonic increase of a coverage objective and is extended with collision avoidance properties. Additionally, a computationally efficient simplified control scheme is offered that is able to achieve comparable performance. Several simulation studies are offered to evaluate the performance of the two control schemes. Finally, two experiments using small differential drive-like robots and an ultra-wideband positioning system were conducted, highlighting the performance of the proposed control scheme in a real world scenario.
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Papatheodorou, Sotiris, and Anthony Tzes. "Fault tolerant area coverage control for multiagent systems." MATEC Web of Conferences 188 (2018): 05010. http://dx.doi.org/10.1051/matecconf/201818805010.

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The fault tolerance characteristics of a distributed multi-agent coverage algorithm are examined. A team of sensor-equipped mobile agents is tasked with covering a planar region of interest. A distributed, gradient-based control scheme is utilized for this purpose. The agents are assumed to consist of three subsystems, each one of which may fail. The subsystems under examination are the actuation, sensing and the communication subsystem. Partial and catastrophic faults are examined. Several simulation studies are conducted highlighting the robustness of the distributed nature of the control scheme to these classes of faults, even when several of them happen at the same time.
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Ibrahim, M., J. Matschek, B. Morabito, and R. Findeisen. "Hierarchical Model Predictive Control for Autonomous Vehicle Area Coverage." IFAC-PapersOnLine 52, no. 12 (2019): 79–84. http://dx.doi.org/10.1016/j.ifacol.2019.11.073.

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Zheng, Zhi, and Zhihong Peng. "Distributed Cooperation Based Priority Coverage Control Strategy for Mobile Sensors." Journal of Advanced Computational Intelligence and Intelligent Informatics 19, no. 2 (March 20, 2015): 191–96. http://dx.doi.org/10.20965/jaciii.2015.p0191.

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Random deployment and inadequate numbers of sensor nodes may cause low coverage, so we propose a new priority coverage control strategy based on the distributed cooperation of mobile sensors. Sensor nodes are distributed randomly around the region of interest (ROI) and searched for independently. When nodes are found, an unbreakable group is formed under repulsion, attraction and speed consistency control, then searching is begun cooperatively. When some node finds a ROI, it guides the other nodes in the group following it to the ROI. While in the ROI, nodes choose the most important position within the sensing range, then move toward it independently while avoiding collision, eventually, reaching the most important area of the ROI. Under the premise of satisfying key area coverage, sensor nodes are adjusted based on the degree of coverage, maximizing coverage. Simulation results show that the proposed method quickly improves the coverage rate and achieves priority coverage of key areas strongly robustly without being adversely affected by sudden damage to nodes. Applications include coverage with limited amounts of nodes in unknown environments.
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Shi, Mengji, and Kaiyu Qin. "Distributed Control of Networked Unmanned Aerial Vehicles for Valley Area Coverage." Mobile Information Systems 2016 (2016): 1–12. http://dx.doi.org/10.1155/2016/3680265.

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The paper provides a novel cooperative motion scheme for networked Unmanned Aerial Vehicles (UAVs) to fully sweep-cover a priori unknown elongated areas with curved borders, which are termed “valley areas.” The UAVs’ motion is confined between the borders. Different from former research on straight-corridor-sweep-coverage, in each valley area, the width of different portions varies dramatically: the UAVs need to line up across the valley area to achieve full coverage of the widest portions while they can only pass through the narrowest parts one by one in a queue. The UAVs are provided with barrier detection and inter-UAV communication. According to the scheme, a distributed control law has been offered for discrete-time multi-UAV systems, guaranteeing crash avoidance and full coverage while considering the constrained mobility of the UAVs. Regular and extreme simulations are carried out to verify the efficacy and stability of the proposed algorithm. Solutions to U-shaped valley coverage and the case of insufficient UAVs available are discussed with validation simulations. Comparison simulations are conducted with respect to a line-sweep-coverage algorithm developed by a closely related work, and differences in performance are revealed subsequently. Conclusions are drawn with possible directions of future research.
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Agarwal, Saurav, and Srinivas Akella. "Area Coverage With Multiple Capacity-Constrained Robots." IEEE Robotics and Automation Letters 7, no. 2 (April 2022): 3734–41. http://dx.doi.org/10.1109/lra.2022.3146952.

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Munawar, Hafiz Suliman, Ahmed W. A. Hammad, and S. Travis Waller. "Disaster Region Coverage Using Drones: Maximum Area Coverage and Minimum Resource Utilisation." Drones 6, no. 4 (April 13, 2022): 96. http://dx.doi.org/10.3390/drones6040096.

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The purpose of this study is to develop a design for maximum area drone coverage in a post-disaster flood situation. When it comes to covering a disaster-region for monitoring and detection of the extent of damage and losses, a suitable and technically balanced approach is vital to achieving the best solution while covering the maximum affected area. Therefore, a mathematical optimisation model is proposed to effectively capture maximum images of the impacted region. The particle swarm optimisation (PSO) algorithm is used to solve the optimisation problem. Modern relief missions heavily rely on drones, specifically in the case of flooding, to capture the damage due to the disaster and to create roadmaps to help impacted people. This system has convincing results for inertia, exploration, exploitation, velocity, and determining the height of the drones to enhance the response to a disaster. The proposed approach indicates that when maintaining the flight height of the drone above 120 m, the coverage can be enhanced by approximately 34% compared with a flight height of 100 m.
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An, Wei, Fang-Ming Shao, and Huajun Meng. "The coverage-control optimization in sensor network subject to sensing area." Computers & Mathematics with Applications 57, no. 4 (February 2009): 529–39. http://dx.doi.org/10.1016/j.camwa.2008.10.095.

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Behairy, Hatim, Waleed Alrobian, Adnan Alghammas, Amr Alasaad, Brian Suter, Mohammed Alshareef, and Yahya Alsuwayyeh. "Selective Mobile Communication within a Coverage Area Bounded by Radiating Cables." Mobile Information Systems 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/138067.

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It is often desirable to control mobile phone services in areas where complete silence is either expected or mandatory, including schools, places of worship, hospitals, and prisons. In contrast to conventional techniques, such as jammers or Faraday cages, we present a novel technique to selectively control mobile phone services within a desired area. Our solution enables the area’s keeper to allow mobile phones on a whitelist to freely use mobile services without disruption while denying services to all other mobile phones that are within the boundaries of the desired area to be controlled. Our solution uses a base station controller to identify all mobile devices located within the area to be controlled, while an antenna is placed inside the area to attract all mobile devices in the area to connect to the base station controller. In previous work, we proposed a system that uses directional antennas for the attraction technique. In this work, we show that replacement of the directional antennas with a leaky feeder antenna enables more accurate control of mobile phone services in and around the area to be controlled. Simulations and experiments of the leaky feeder technique confirm its precise control of mobile phone services within the desired areas.
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Dissertations / Theses on the topic "Area Coverage Control"

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Adepegba, Adekunle Akinpelu. "Multi-Agent Area Coverage Control Using Reinforcement Learning Techniques." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/34584.

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An area coverage control law in cooperation with reinforcement learning techniques is proposed for deploying multiple autonomous agents in a two-dimensional planar area. A scalar field characterizes the risk density in the area to be covered yielding nonuniform distribution of agents while providing optimal coverage. This problem has traditionally been addressed in the literature to date using locational optimization and gradient descent techniques, as well as proportional and proportional-derivative controllers. In most cases, agents' actuator energy required to drive them in optimal configurations in the workspace is not considered. Here the maximum coverage is achieved with minimum actuator energy required by each agent. Similar to existing coverage control techniques, the proposed algorithm takes into consideration time-varying risk density. These density functions represent the probability of an event occurring (e.g., the presence of an intruding target) at a certain location or point in the workspace indicating where the agents should be located. To this end, a coverage control algorithm using reinforcement learning that moves the team of mobile agents so as to provide optimal coverage given the density functions as they evolve over time is being proposed. Area coverage is modeled using Centroidal Voronoi Tessellation (CVT) governed by agents. Based on [1,2] and [3], the application of Centroidal Voronoi tessellation is extended to a dynamic changing harbour-like environment. The proposed multi-agent area coverage control law in conjunction with reinforcement learning techniques is implemented in a distributed manner whereby the multi-agent team only need to access information from adjacent agents while simultaneously providing dynamic target surveillance for single and multiple targets and feedback control of the environment. This distributed approach describes how automatic flocking behaviour of a team of mobile agents can be achieved by leveraging the geometrical properties of centroidal Voronoi tessellation in area coverage control while enabling multiple targets tracking without the need of consensus between individual agents. Agent deployment using a time-varying density model is being introduced which is a function of the position of some unknown targets in the environment. A nonlinear derivative of the error coverage function is formulated based on the single-integrator agent dynamics. The agent, aware of its local coverage control condition, learns a value function online while leveraging the same from its neighbours. Moreover, a novel computational adaptive optimal control methodology based on work by [4] is proposed that employs the approximate dynamic programming technique online to iteratively solve the algebraic Riccati equation with completely unknown system dynamics as a solution to linear quadratic regulator problem. Furthermore, an online tuning adaptive optimal control algorithm is implemented using an actor-critic neural network recursive least-squares solution framework. The work in this thesis illustrates that reinforcement learning-based techniques can be successfully applied to non-uniform coverage control. Research combining non-uniform coverage control with reinforcement learning techniques is still at an embryonic stage and several limitations exist. Theoretical results are benchmarked and validated with related works in area coverage control through a set of computer simulations where multiple agents are able to deploy themselves, thus paving the way for efficient distributed Voronoi coverage control problems.
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Mansouri, Sina Sharif. "On Visual Area Coverage Using Micro Aerial Vehicles." Licentiate thesis, Luleå tekniska universitet, Signaler och system, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-68666.

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The aim of this Licentiate is to advance the field of cooperative visual coverage path planners for multiple Micro Aerial Vehicles (MAVs), while aiming for their real life adoption towards the tasks of aerial infrastructure inspection. The fields that will be addressed are focusing in: a) the collaborative perception of the environment, b) the collaborative visual inspection, and c) the optimization of the aerial missions based on the remaining flying battery, camera constraints, coverage constraints and other real life mission induced constraints. Towards this envisioned aim, this Licentiate will present the following main theoretical contributions: a) centralized and distributed Model Predictive Control (MPC) schemes for the cooperative motion control of MAVs focusing in the establishing of a formation control architecture to enable a dynamic visual sensor from monocular cameras towards a reconfigurable environmental perception, b) revisiting the Cooperative Coverage Path Planning (C-CPP) problem for the inspection of complex infrastructures, c) developing a holistic approach to the problems of 2-D area coverage with MAVs for polygon areas, while considering the camera footprint, and d) designing of a scheme to estimate the Remaining Useful Life (RUL) of the battery during a flight mission, a fact that directly effects the flying capabilities of the MAVs. The theoretical contributions of this thesis have been extensively evaluated in simulation and real life large scale field trials, a direction that adds another contribution of the suggested framework towards the massive insertion of the aerial platforms as aerial tools in the close future. In the first part of this Licentiate, the vision, motivation, open challenges, contributions, and future works are discussed, while in the second part the full articles connected to the presented contributions in this Licentiate are presented in the annex.
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Fan, Jiankun. "Optimal Path Planning and Control of Quadrotor Unmanned Aerial Vehicle for Area Coverage." University of Toledo / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1417345596.

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Schroeder, Adam. "A Stochastic, Swarm-Based Control Law for Emergent System-Level Area Coverage byRobots." University of Toledo / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1460560829.

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Huang, Hsin-Wen, and 黃信文. "Effectiveness of Prevention Coverage to Control PM10 for large Scale Exposure Area - A Case Study of Woven Straw." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/j7pdz5.

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碩士
國立臺北科技大學
環境規劃與管理研究所
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Woven Straw have been demonstrated to be a cost-effective measure to prevent PM10 (particle matter sized less than 10 μm). PM10 is a typical air pollution source produced emitted from exposure area, like cropland. From the engineering application point of view, an approach using dimensionless analysis with a multi-variable regression method based on PM10 experimental data would be worth exploring to predict the prevention efficiencies of woven straw. A series of field-analogous experiments were carried out to measure PM10 using TOPAS samplers (continuous laser monitoring, serial No. 1055) in an artificial wind tunnel system for woven straw. It is found that the prevention efficiencies of PM10 is significantly dependent on the coverage percentage of woven straw, and the prevention efficiency was also affected primarily by the moisture, silt content, and the wind velocity. Correlated with these primary parameters, a useful equation is proposed to estimate the prevention efficiencies that would be valid under the appropriate conditions suggested by this work.
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Books on the topic "Area Coverage Control"

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Ivanishchev, Viktor (Victor). Molecular biology. ru: Publishing Center RIOR, 2020. http://dx.doi.org/10.29039/01857-6.

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The textbook presents the main range of issues in molecular biology — the most rapidly developing area of biological science. The logic of the presentation of the material includes sequential coverage of the structural organization and functions of DNA, RNA, proteins. Important attention is paid to the mechanisms of signal transmission in living systems, the problems of creating and using genetically engineered organisms. Each chapter ends with control questions and assignments for independent work. The textbook includes a set of laboratory and practical works that do not require specialized equipment and materials. The new edition has been supplemented and clarified, reflecting the current state of science. The content of the textbook corresponds to a number of competencies, the development of which is provided for by the Federal State Educational Standard of Higher Education in the preparation of bachelors in the fields of "Pedagogical Education" (profiles "Biology" and "Chemistry"), "Biology". Certain topics can be used in the preparation of masters in the fields of "Biology", "Chemistry", "Natural Science Education". The book is intended for students studying in natural sciences, and will also be useful for teachers of biology and chemistry of high school.
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Perry, Roland N., David J. Hunt, and Sergei A. Subbotin, eds. Techniques for work with plant and soil nematodes. Wallingford: CABI, 2021. http://dx.doi.org/10.1079/9781786391759.0000.

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Abstract This book is extensively illustrated, and addresses both fundamental traditional techniques and new methodologies. The chapters aim to provide an introduction to basic techniques for laboratory and field work with plant-parasitic and free-living soil-dwelling nematodes. The coverage highlights areas that have expanded and/or become more widespread over recent years, such as techniques used in diagnostic laboratories, including computerized methods to count and identify nematodes, and the use of entomopathogenic nematodes as environmentally acceptable control systems for some insect pests. The use of molecular techniques is relevant to many areas of work on nematodes and basic information on current molecular methodologies and their various applications is included.
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Allen, Nicola J. Glial Control of Synaptogenesis. Oxford University Press, 2013. http://dx.doi.org/10.1093/med/9780199794591.003.0031.

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This is a digitally enhanced text. Readers can also see the coverage of this topic area in the second edition of Neuroglia. The second edition of Neuroglia was first published digitally in Oxford Scholarship Online and the bibliographic details provided, if cited, will direct people to that version of the text. Readers can also see the coverage of this topic area in the ...
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Howarth, Clare, Grant R. J. Gordon, and Brian A. MacVicar. Astrocyte Regulation of Neurovascular Control. Oxford University Press, 2013. http://dx.doi.org/10.1093/med/9780199794591.003.0037.

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This is a digitally enhanced text. Readers can also see the coverage of this topic area in the second edition of Neuroglia. The second edition of Neuroglia was first published digitally in Oxford Scholarship Online and the bibliographic details provided, if cited, will direct people to that version of the text. Readers can also see the coverage of this topic area in the ...
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Syková, Eva. Control of the Extracellular Ionic Environment and Volume. Oxford University Press, 2013. http://dx.doi.org/10.1093/med/9780199794591.003.0034.

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This is a digitally enhanced text. Readers can also see the coverage of this topic area in the second edition of Neuroglia. The second edition of Neuroglia was first published digitally in Oxford Scholarship Online and the bibliographic details provided, if cited, will direct people to that version of the text. Readers can also see the coverage of this topic area in the ...
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Sundstrom, Beth L., and Cara Delay. Birth Control. Oxford University Press, 2020. http://dx.doi.org/10.1093/wentk/9780190069674.001.0001.

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Birth control offers women the opportunity to prevent pregnancy, plan and space their births, or have no births at all. And yet, in the United States, half of all pregnancies remain unintended, and access to birth control is beset by inequities in education, access, and coverage. Research indicates that women are familiar with the range of contraceptive methods available today. But the persistently high rates of unintended pregnancy, combined with common dissatisfaction and discontinuation, suggest that women’s contraceptive needs continue to be unmet. Birth Control: What Everyone Needs to Know will offer more than a user’s guide to available means of contraception: it will examine how supported family-planning infrastructure impacts society as a whole. Through reviews of policy, scientific literature, and supplemental interviews with women, it will uncover women’s concerns and apprehensions about contraception, as well as the ways birth control empowers women and increases access to educational and professional opportunities. It will provide an overview the history of birth control, the risks and benefits of contraception, the role of menstruation, and the future of birth control. The goal of this book is to provide accurate, unbiased scientific information about contraception in the context of women’s lived experiences and the realities of how individuals make decisions about birth control.
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Battin, Margaret P. Reproductive Control for Men. Edited by Leslie Francis. Oxford University Press, 2016. http://dx.doi.org/10.1093/oxfordhb/9780199981878.013.16.

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Although women have many contraceptive options—gels, foams, pills, patches, rings, injections, subdermal implants, intrauterine devices, most with low failure rates and good reversibility—men have only the condom, withdrawal, and vasectomy, all with high failure rates or no guarantee of reversibility. This leaves men with unequal options for reproductive control, yet they may be held responsible for support of a child whether they wanted to reproduce or not. Five types of modern male contraception are now under development: they all raise issues of effectiveness, acceptability, and risk, but would give males far greater reproductive control. However, the common “one’s enough” assumption—that it is sufficient if either the male or the female contracepts—means that reproductive control could shift from females to males. “One’s enough” must be challenged in favor of “double coverage,” highly effective long-acting reversible contraception as routine for both parties, the nearest guarantee of female–male equality in reproductive control.
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Edwards, Nancy C., Barbara L. Riley, and Cameron D. Willis. Scaling-Up Cancer Control Innovations. Edited by David A. Chambers, Wynne E. Norton, and Cynthia A. Vinson. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780190647421.003.0035.

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This chapter examines characteristics of and approaches to scaling-up innovations and programs, with illustrations from the field of cancer control. It summarizes definitions of scale-up, emphasizing the introduction of innovations with demonstrated effectiveness and the aims of scale-up: improving coverage and equitable access to the innovation(s) and its intended benefits. The chapter proposes a typology to help guide scaling-up activities. The typology includes five dimensions: the object of scale-up, how this object may be adapted, horizontal and vertical directions for scale-up, linear and nonlinear pathways for scale-up, and factors influencing scale-up. Featuring examples of tobacco control and human papillomavirus vaccination, the typology is applied and key scaling-up actions are described, including media campaigns, engaging key stakeholders, mobilizing political support, and investing in a monitoring and evaluation system. Systemic challenges to scale-up are discussed. Future priorities for research on scaling up cancer control initiatives are proposed.
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Pagè, Fréric, Dominique Maison, and Michael Faulde. Current control strategies for infectious diseases in low-income countries. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198789833.003.0002.

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The burden of communicable diseases is ten times higher in low- and middle-income countries (LMICs) in terms of mortality rate and of years of life lost. Most of the LMCIs are in tropical or subtropical areas with vector-favorable climate conditions and poverty impeding access to improved water supply, sanitation, and efficient health care coverage. Public health strategies to control infectious diseases can be sorted by prevention level. Infectious diseases control strategies often combine actions from different prevention levels according to the stage of a disease. At the individual level, actions and interventions are succeeding in a logical cascade following the stage of the disease as community-level actions are implemented. We present strategies that have been implemented to control infectious diseases, their limits and the needs to attain successful control of infectious diseases in LMICs.
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Limebeer, D. J. N., and Matteo Massaro. Dynamics and Optimal Control of Road Vehicles. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198825715.001.0001.

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The broad aim of this book is to provide a comprehensive coverage of the modelling and optimal control of both two‐ and four‐wheeled road vehicles. The first focus of this book is a review of classical mechanics and its use in building vehicle and tyre dynamic models. The second is nonlinear optimal control, which is used to solve a range of minimum‐time, minimum‐fuel, and track curvature reconstruction problems. As is known classically, all thismaterial is bound together by the calculus of variations and stationary principles. The treatment of this material is supplemented with a large number of examples that highlight obscurities and subtleties in the theory. A particular strength of the book is its unified treatment of tyre, car, and motorcycle dynamics and the application of nonlinear optimal control to vehicle‐related problems within a single text. These topics are usually treated independently, and can only be found in disparate texts and journal articles. It is our contention that presentday vehicle dynamicists should be familiar with all of these topic areas. The aim in writing this book is to provide a comprehensive and yet accessible text that emphasizes particularly the theoretical aspects of vehicular modelling and control.
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Book chapters on the topic "Area Coverage Control"

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Iftekhar, Lamia, H. M. Nafid Rahman, and Imran Rahman. "Area Coverage Algorithms for Networked Multi-robot Systems." In New Developments and Advances in Robot Control, 301–20. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-2212-9_14.

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Mahboubi, Hamid, Amir G. Aghdam, and Kamran Sayrafian-Pour. "Area Coverage in a Fixed-Obstacle Environment Using Mobile Sensor Networks." In Studies in Systems, Decision and Control, 135–51. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-14636-2_7.

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Ali Safdar, Ghazanfar. "Coverage Area-Based Power Control for Interference Management in LTE Femtocells." In LTE Communications and Networks, 84–103. Chichester, UK: John Wiley & Sons, Ltd, 2018. http://dx.doi.org/10.1002/9781119385271.ch4.

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Du, Wentao, Zhiqiang Li, Weihao Li, Boxian Lin, and Mengji Shi. "Cooperative Unknown Area Coverage by a Swarm of Agents with Limited Sensing and Identification Capabilities." In Proceedings of 2021 5th Chinese Conference on Swarm Intelligence and Cooperative Control, 1–12. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-3998-3_1.

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Su, Lijuan, and Svetlana Stepchenkova. "The Impact of Crisis Characteristics and Media Coverage on the Public’s Attitude Toward Tourism Organization Expressed on Sina Weibo." In Information and Communication Technologies in Tourism 2021, 302–7. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-65785-7_28.

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AbstractTourism and hospitality crises that are extensively discussed online are damaging to organizational image and reputation; therefore, choosing effective response strategies is of paramount importance for service providers. The online discussions data from six hospitality and tourism related crises were used to test which crisis and media coverage characteristics significantly affected the public’s emotional and behavioral reactions to crises. With reference to the attribution theory and the situational crisis communication theory, this study identified the potentially influential crisis characteristics, hypothesized their relationship with variables describing consumer reactions to crises, and then tested those relationships in a series of ANOVA and hierarchical regression analyses. Results indicated that the locus of control, crisis stability, attribution of organizational responsibility, and organizational response strategy affected the public’s cognitive and emotional responses to crises most strongly. The attractiveness and goodwill of media sources also had an effect, as well as the quality and fairness of messages. This study makes a methodological contribution to tourism research by training machine-learning classifiers prior to conducting hypothesis testing. Identifying the most influential factors affecting the public’s response to crises can serve as guidelines for tourism and hospitality organizations in monitoring the spread of online crisis discussions and developing the most appropriate response in order to minimize consumers’ negative emotions that affect online and off-line behavior toward the organization and its brand.
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Gabriele, Simone, and Paolo Di. "The Area Coverage Problem for Dynamic Sensor Networks." In New Developments in Robotics Automation and Control. InTech, 2008. http://dx.doi.org/10.5772/6293.

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Guo, Cheng, R. Venkatesha Prasad, Jing Wang, Vijay Sathyanarayana Rao, and Ignas Niemegeers. "Localizing Persons Using Body Area Sensor Network." In Developments in Wireless Network Prototyping, Design, and Deployment, 273–89. IGI Global, 2012. http://dx.doi.org/10.4018/978-1-4666-1797-1.ch013.

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Context awareness is an important aspect in many ICT applications. For example, in an intelligent home network, location of the user enables session transfer, lighting, and temperature control, et cetera. In fact, in a body area sensor network (BASN), location estimation of a user helps in realizing realtime monitoring of the person (especially those who require help) for better health supervision. In this chapter the authors first introduce many localization methods and algorithms from the literature in BASNs. They also present classification of these methods. Amongst them, location estimation using signal strength is one of the foremost. In indoor environments, the authors found that the signal strength based localization methods are usually not accurate, since signal strength fluctuates. The fluctuation in signal strength is due to deficient antenna coverage and multi-path interference. Thus, localization algorithms usually fail to achieve good accuracy. The authors propose to solve this problem by combining multiple receivers in a body area sensor network to estimate the location with a higher accuracy. This method mitigates the errors caused by antenna orientations and beam forming properties. The chapter evaluates the performance of the solution with experiments. It is tested with both range-based and range-free localization algorithm that we developed. The chapter shows that with spatial diversity, the localization accuracy is improved compared to using single receiver alone. Moreover, the authors observe that range-based algorithm has a better performance.
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Duan, Xiangjun, Jia Li, and Dezhi Feng. "Design and Application of the Intelligent Operation, Control and Maintenance of Distribution Networks Based on Wide-Area Distributed Sinking Computing Technology." In Advances in Transdisciplinary Engineering. IOS Press, 2022. http://dx.doi.org/10.3233/atde220065.

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The distribution network (DN) is characterized by wide coverage and highly scattered data distribution. To improve the business process and data calculation capability for DN management, a foundational computing technology, the wide-area distributed sinking calculation technology (W-A DSCT), is proposed based on the application of big data, artificial intelligence, block chain and other technologies. It is applicable to the OCMS (operation, control and maintenance) of distribution networks. The technology adopts the concept of “moving computation, not moving to data” to realize fast processing of business applications. The algorithm and business logic are designed at the primary node level, and the algorithm compilation and data crawling and mining are performed at the sub-node level to realize the fast business response. This paper introduces the technical implementation methods and technologies of each link, and performs a comparative analysis for typical business scenarios between the sinking calculation scheme and the original framework calculation. It is verified that applying the sinking calculation scheme can significantly enhance the rapid processing ability and computational efficiency.
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Lloret, Jaime, Miguel Garcia, Hugo Coll, and Miguel Edo. "Wireless Sensor Networks and Systems." In Wireless Technologies, 33–45. IGI Global, 2012. http://dx.doi.org/10.4018/978-1-61350-101-6.ch102.

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Sensor networks are one of the most powerful technologies applied to control and supervising systems. They are present in almost all environments, so we can find them in different industrial, medical, security and/or home applications. In addition, the use of wireless technologies applied to sensor networks improves the final system. Examples given are the enlargement of the coverage area and the low deployment costs. Nowadays a combination of both items is used in many common implementations of a wide variety of applications. This chapter is focused on the use of sensor networks applied to disabled and elderly people. We will study the wireless technologies most used for this purpose and we will show a survey with the benefits when they are applied.
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Lloret, Jaime, Miguel Garcia, Hugo Coll, and Miguel Edo. "Wireless Sensor Networks and Systems." In Handbook of Research on Personal Autonomy Technologies and Disability Informatics, 251–63. IGI Global, 2011. http://dx.doi.org/10.4018/978-1-60566-206-0.ch016.

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Sensor networks are one of the most powerful technologies applied to control and supervising systems. They are present in almost all environments, so we can find them in different industrial, medical, security and/or home applications. In addition, the use of wireless technologies applied to sensor networks improves the final system. Examples given are the enlargement of the coverage area and the low deployment costs. Nowadays a combination of both items is used in many common implementations of a wide variety of applications. This chapter is focused on the use of sensor networks applied to disabled and elderly people. We will study the wireless technologies most used for this purpose and we will show a survey with the benefits when they are applied.
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Conference papers on the topic "Area Coverage Control"

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Papatheodorou, Sotitis, Yiannis Stergiopoulos, and Anthony Tzes. "Distributed area coverage control with imprecise robot localization." In 2016 24th Mediterranean Conference on Control and Automation (MED). IEEE, 2016. http://dx.doi.org/10.1109/med.2016.7535920.

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Cortes, Jorge. "Area-constrained coverage optimization by robotic sensor networks." In 2008 47th IEEE Conference on Decision and Control. IEEE, 2008. http://dx.doi.org/10.1109/cdc.2008.4738883.

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Tian, Ying, Xiaoqian Yang, Yang Ou, and Guohong You. "An area coverage control protocol based on probabilistic coverage for wireless sensor networks." In 2016 Seventh International Conference on Intelligent Control and Information Processing (ICICIP). IEEE, 2016. http://dx.doi.org/10.1109/icicip.2016.7885910.

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Rodriguez-Seda, Erick J., and Yancy Diaz-Mercado. "Decentralized Persistent Area Coverage Control with Loss of Awareness." In 2020 IEEE Conference on Control Technology and Applications (CCTA). IEEE, 2020. http://dx.doi.org/10.1109/ccta41146.2020.9206267.

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Ivan, Vladimir, and Sethu Vijayakumar. "Space-time area coverage control for robot motion synthesis." In 2015 International Conference on Advanced Robotics (ICAR). IEEE, 2015. http://dx.doi.org/10.1109/icar.2015.7251457.

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Bao Xi-rong, Sun Xue-yun, Zhang Shi, and Zhang Xue-feng. "Area coverage based domain division in wireless sensor network." In 2009 Chinese Control and Decision Conference (CCDC). IEEE, 2009. http://dx.doi.org/10.1109/ccdc.2009.5194842.

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Kang, Yaru, and Dianxi Shi. "A Research on Area Coverage Algorithm for Robotics." In 2018 IEEE International Conference of Intelligent Robotic and Control Engineering (IRCE). IEEE, 2018. http://dx.doi.org/10.1109/irce.2018.8492964.

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Miah, Suruz, Mostafa M. H. Fallah, Arian Y. Panah, and Davide Spinello. "Non-Autonomous Feedback Control for Area Coverage Problems With Time-Varying Risk." In ASME 2016 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/dscc2016-9669.

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Motivated by area coverage optimization problems with time varying risk densities, we propose a decentralized control law for a team of autonomous mobile agents in a two dimensional area such that their asymptotic configurations optimize a generalized non-autonomous coverage metric. The generalized non-autonomous coverage metric explicitly depends on a nonuniform time-varying measurable scalar field that is not directly controllable by agents. Several interesting scenarios emerge with time varying risk density. In this work, we consider the case of area surveillance against moving targets or external threats penetrating through the perimeter, and the case of environmental monitoring and intervention with deployment of mobile sensors in areas affected by penetration of substances governed by diffusion mechanisms, as for example oil in a marine environment. In the presence of time-varying risk density the coverage metric is non-autonomous as it includes a time varying component that does not depend on the evolution of the agents. Our non-autonomous feedback law accounts for the time-varying component through a term that vanishes when the risk eventually stops evolving. Optimality with respect to the induced non-autonomous coverage is proven in the framework of Barbalat’s lemma, and the performance is illustrated through simulation of the these two scenarios.
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Patel, Rushabh, Paolo Frasca, and Francesco Bullo. "Centroidal Area-Constrained Partitioning for Robotic Networks." In ASME 2013 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/dscc2013-3742.

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We consider the problem of optimal coverage with area-constraints in a mobile multi-agent system. For a planar environment with an associated density function, this problem is equivalent to dividing the environment into optimal subregions such that each agent is responsible for the coverage of its own region. In this paper, we design a continuous-time distributed policy which allows a team of agents to achieve a convex area-constrained partition of a convex workspace. Our work is related to the classic Lloyd algorithm, and makes use of generalized Voronoi diagrams. We also discuss practical implementation for real mobile networks. Simulation methods are presented and discussed.
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Banerjee, Chayan, and Navya Deepthi. "Multiagent coalition formation for distributed area coverage & exploration." In 2015 International Conference on Robotics, Automation, Control and Embedded Systems (RACE). IEEE, 2015. http://dx.doi.org/10.1109/race.2015.7097274.

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Reports on the topic "Area Coverage Control"

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Visser, R., H. Kao, R. M. H. Dokht, A. B. Mahani, and S. Venables. A comprehensive earthquake catalogue for northeastern British Columbia: the northern Montney trend from 2017 to 2020 and the Kiskatinaw Seismic Monitoring and Mitigation Area from 2019 to 2020. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/329078.

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To increase our understanding of induced seismicity, we develop and implement methods to enhance seismic monitoring capabilities in northeastern British Columbia (NE BC). We deploy two different machine learning models to identify earthquake phases using waveform data from regional seismic stations and utilize an earthquake database management system to streamline the construction and maintenance of an up-to-date earthquake catalogue. The completion of this study allows for a comprehensive catalogue in NE BC from 2014 to 2020 by building upon our previous 2014-2016 and 2017-2018 catalogues. The bounds of the area where earthquakes were located were between 55.5°N-60.0°N and 119.8°W-123.5°W. The earthquakes in the catalogue were initially detected by machine learning models, then reviewed by an analyst to confirm correct identification, and finally located using the Non-Linear Location (NonLinLoc) algorithm. Two distinct sub-areas within the bounds consider different periods to supplement what was not covered in previously published reports - the Northern Montney Trend (NMT) is covered from 2017 to 2020 while the Kiskatinaw Seismic Monitoring and Mitigation Area (KSMMA) is covered from 2019 to 2020. The two sub-areas are distinguished by the BC Oil & Gas Commission (BCOGC) due to differences in their geographic location and geology. The catalogue was produced by picking arrival phases on continuous seismic waveforms from 51 stations operated by various organizations in the region. A total of 17,908 events passed our quality control criteria and are included in the final catalogue. Comparably, the routine Canadian National Seismograph Network (CNSN) catalogue reports 207 seismic events - all events in the CNSN catalogue are present in our catalogue. Our catalogue benefits from the use of enhanced station coverage and improved methodology. The total number of events in our catalogue in 2017, 2018, 2019, and 2020 were 62, 47, 9579 and 8220, respectively. The first two years correspond to seismicity in the NMT where poor station coverage makes it difficult to detect small magnitude events. The magnitude of completeness within the KSMMA (ML = ~0.7) is significantly smaller than that obtained for the NMT (ML = ~1.4). The new catalogue is released with separate files for origins, arrivals, and magnitudes which can be joined using the unique ID assigned to each event.
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Chen, Liming, David Raitzer, Rana Hasan, Rouselle Lavado, and Orlee Velarde. What Works to Control COVID-19? Econometric Analysis of a Cross-Country Panel. Asian Development Bank, December 2020. http://dx.doi.org/10.22617/wps200354-2.

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The paper examines the effects of nonpharmaceutical interventions on transmission of the novel coronavirus disease (COVID-19) as captured by its reproduction rate 𝑅t. Using cross-country panel data, the paper finds that while lockdown measures have strong effects on 𝑅t, gathering bans appear to be more effective than workplace and school closures. Ramping up the testing and tracing of COVID-19 cases is found to be especially effective in controlling the spread of the disease where there is greater coverage of paid sick leave benefits. Workplace and school closures are found to have large negative effects on gross domestic product compared with other measures, suggesting that a more targeted approach can be taken to keep the epidemic controlled at lower cost.
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Hajarizadeh, Behzad, Jennifer MacLachlan, Benjamin Cowie, and Gregory J. Dore. Population-level interventions to improve the health outcomes of people living with hepatitis B: an Evidence Check brokered by the Sax Institute for the NSW Ministry of Health, 2022. The Sax Institute, August 2022. http://dx.doi.org/10.57022/pxwj3682.

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Background An estimated 292 million people are living with chronic hepatitis B virus (HBV) infection globally, including 223,000 people in Australia. HBV diagnosis and linkage of people living with HBV to clinical care is suboptimal in Australia, with 27% of people living with HBV undiagnosed and 77% not receiving regular HBV clinical care. This systematic review aimed to characterize population-level interventions implemented to enhance all components of HBV care cascade and analyse the effectiveness of interventions. Review questions Question 1: What population-level interventions, programs or policy approaches have been shown to be effective in reducing the incidence of hepatitis B; and that may not yet be fully rolled out or evaluated in Australia demonstrate early effectiveness, or promise, in reducing the incidence of hepatitis B? Question 2: What population-level interventions and/or programs are effective at reducing disease burden for people in the community with hepatitis B? Methods Four bibliographic databases and 21 grey literature sources were searched. Studies were eligible for inclusion if the study population included people with or at risk of chronic HBV, and the study conducted a population-level interventions to decrease HBV incidence or disease burden or to enhance any components of HBV care cascade (i.e., diagnosis, linkage to care, treatment initiation, adherence to clinical care), or HBV vaccination coverage. Studies published in the past 10 years (since January 2012), with or without comparison groups were eligible for inclusion. Studies conducting an HBV screening intervention were eligible if they reported proportion of people participating in screening, proportion of newly diagnosed HBV (participant was unaware of their HBV status), proportion of people received HBV vaccination following screening, or proportion of participants diagnosed with chronic HBV infection who were linked to HBV clinical care. Studies were excluded if study population was less than 20 participants, intervention included a pharmaceutical intervention or a hospital-based intervention, or study was implemented in limited clinical services. The records were initially screened by title and abstract. The full texts of potentially eligible records were reviewed, and eligible studies were selected for inclusion. For each study included in analysis, the study outcome and corresponding 95% confidence intervals (95%CIs) were calculated. For studies including a comparison group, odds ratio (OR) and corresponding 95%CIs were calculated. Random effect meta-analysis models were used to calculate the pooled study outcome estimates. Stratified analyses were conducted by study setting, study population, and intervention-specific characteristics. Key findings A total of 61 studies were included in the analysis. A large majority of studies (study n=48, 79%) included single-arm studies with no concurrent control, with seven (12%) randomised controlled trials, and six (10%) non-randomised controlled studies. A total of 109 interventions were evaluated in 61 included studies. On-site or outreach HBV screening and linkage to HBV clinical care coordination were the most frequent interventions, conducted in 27 and 26 studies, respectively. Question 1 We found no studies reporting HBV incidence as the study outcome. One study conducted in remote area demonstrated that an intervention including education of pregnant women and training village health volunteers enhanced coverage of HBV birth dose vaccination (93% post-intervention, vs. 81% pre-intervention), but no data of HBV incidence among infants were reported. Question 2 Study outcomes most relevant to the HBV burden for people in the community with HBV included, HBV diagnosis, linkage to HBV care, and HBV vaccination coverage. Among randomised controlled trials aimed at enhancing HBV screening, a meta-analysis was conducted including three studies which implemented an intervention including community face-to-face education focused on HBV and/or liver cancer among migrants from high HBV prevalence areas. This analysis demonstrated a significantly higher HBV testing uptake in intervention groups with the likelihood of HBV testing 3.6 times higher among those participating in education programs compared to the control groups (OR: 3.62, 95% CI 2.72, 4.88). In another analysis, including 25 studies evaluating an intervention to enhance HBV screening, a pooled estimate of 66% of participants received HBV testing following the study intervention (95%CI: 58-75%), with high heterogeneity across studies (range: 17-98%; I-square: 99.9%). A stratified analysis by HBV screening strategy demonstrated that in the studies providing participants with on-site HBV testing, the proportion receiving HBV testing (80%, 95%CI: 72-87%) was significantly higher compared to the studies referring participants to an external site for HBV testing (54%, 95%CI: 37-71%). In the studies implementing an intervention to enhance linkage of people diagnosed with HBV infection to clinical care, the interventions included different components and varied across studies. The most common component was post-test counselling followed by assistance with scheduling clinical appointments, conducted in 52% and 38% of the studies, respectively. In meta-analysis, a pooled estimate of 73% of people with HBV infection were linked to HBV clinical care (95%CI: 64-81%), with high heterogeneity across studies (range: 28-100%; I-square: 99.2%). A stratified analysis by study population demonstrated that in the studies among general population in high prevalence countries, 94% of people (95%CI: 88-100%) who received the study intervention were linked to care, significantly higher than 72% (95%CI: 61-83%) in studies among migrants from high prevalence area living in a country with low prevalence. In 19 studies, HBV vaccination uptake was assessed after an intervention, among which one study assessed birth dose vaccination among infants, one study assessed vaccination in elementary school children and 17 studies assessed vaccination in adults. Among studies assessing adult vaccination, a pooled estimate of 38% (95%CI: 21-56%) of people initiated vaccination, with high heterogeneity across studies (range: 0.5-93%; I square: 99.9%). A stratified analysis by HBV vaccination strategy demonstrated that in the studies providing on-site vaccination, the uptake was 78% (95%CI: 62-94%), significantly higher compared to 27% (95%CI: 13-42%) in studies referring participants to an external site for vaccination. Conclusion This systematic review identified a wide variety of interventions, mostly multi-component interventions, to enhance HBV screening, linkage to HBV clinical care, and HBV vaccination coverage. High heterogeneity was observed in effectiveness of interventions in all three domains of screening, linkage to care, and vaccination. Strategies identified to boost the effectiveness of interventions included providing on-site HBV testing and vaccination (versus referral for testing and vaccination) and including community education focussed on HBV or liver cancer in an HBV screening program. Further studies are needed to evaluate the effectiveness of more novel interventions (e.g., point of care testing) and interventions specifically including Indigenous populations, people who inject drugs, men who have sex with men, and people incarcerated.
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Wozniakowska, P., D. W. Eaton, C. Deblonde, A. Mort, and O. H. Ardakani. Identification of regional structural corridors in the Montney play using trend surface analysis combined with geophysical imaging, British Columbia and Alberta. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328850.

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The Western Canada Sedimentary Basin (WCSB) is a mature oil and gas basin with an extraordinary endowment of publicly accessible data. It contains structural elements of varying age, expressed as folding, faulting, and fracturing, which provide a record of tectonic activity during basin evolution. Knowledge of the structural architecture of the basin is crucial to understand its tectonic evolution; it also provides essential input for a range of geoscientific studies, including hydrogeology, geomechanics, and seismic risk analysis. This study focuses on an area defined by the subsurface extent of the Triassic Montney Formation, a region of the WCSB straddling the border between Alberta and British Columbia, and covering an area of approximately 130,000 km2. In terms of regional structural elements, this area is roughly bisected by the east-west trending Dawson Creek Graben Complex (DCGC), which initially formed in the Late Carboniferous, and is bordered to the southwest by the Late Cretaceous - Paleocene Rocky Mountain thrust and fold belt (TFB). The structural geology of this region has been extensively studied, but structural elements compiled from previous studies exhibit inconsistencies arising from distinct subregions of investigation in previous studies, differences in the interpreted locations of faults, and inconsistent terminology. Moreover, in cases where faults are mapped based on unpublished proprietary data, many existing interpretations suffer from a lack of reproducibility. In this study, publicly accessible data - formation tops derived from well logs, LITHOPROBE seismic profiles and regional potential-field grids, are used to delineate regional structural elements. Where seismic profiles cross key structural features, these features are generally expressed as multi-stranded or en echelon faults and structurally-linked folds, rather than discrete faults. Furthermore, even in areas of relatively tight well control, individual fault structures cannot be discerned in a robust manner, because the spatial sampling is insufficient to resolve fault strands. We have therefore adopted a structural-corridor approach, where structural corridors are defined as laterally continuous trends, identified using geological trend surface analysis supported by geophysical data, that contain co-genetic faults and folds. Such structural trends have been documented in laboratory models of basement-involved faults and some types of structural corridors have been described as flower structures. The distinction between discrete faults and structural corridors is particularly important for induced seismicity risk analysis, as the hazard posed by a single large structure differs from the hazard presented by a corridor of smaller pre-existing faults. We have implemented a workflow that uses trend surface analysis based on formation tops, with extensive quality control, combined with validation using available geophysical data. Seven formations are considered, from the Late Cretaceous Basal Fish Scale Zone (BFSZ) to the Wabamun Group. This approach helped to resolve the problem of limited spatial extent of available seismic data and provided a broader spatial coverage, enabling the investigation of structural trends throughout the entirety of the Montney play. In total, we identified 34 major structural corridors and number of smaller-scale structures, for which a GIS shapefile is included as a digital supplement to facilitate use of these features in other studies. Our study also outlines two buried regional foreland lobes of the Rocky Mountain TFB, both north and south of the DCGC.
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Klymenko, Mykola V., and Andrii M. Striuk. Development of software and hardware complex of GPS-tracking. CEUR Workshop Proceedings, March 2021. http://dx.doi.org/10.31812/123456789/4430.

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The paper considers the typical technical features of GPS-tracking systems and their development, as well as an analysis of existing solutions to the problem. Mathematical models for the operation of hardware and software of this complex have been created. An adaptive user interface has been developed that allows you to use this complex from a smartphone or personal computer. Methods for displaying the distance traveled by a moving object on an electronic map have been developed. Atmega162-16PU microcontroller software for GSM module and GPS receiver control has been developed. A method of data transfer from a GPS tracker to a web server has been developed. Two valid experimental samples of GPS-trackers were made and tested in uncertain conditions. The GPS-tracking software and hardware can be used to monitor the movement of moving objects that are within the coverage of GSM cellular networks.
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Scholl, Lynn, Felipe Bedoya-Maya, Orlando Sabogal-Cardona, and Daniel Oviedo. Making the Links between Ride-hailing and Public Transit Ridership: Impacts in Medium and Large Colombian Cities. Inter-American Development Bank, October 2021. http://dx.doi.org/10.18235/0003697.

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As transit ridership continues to fall in many cities across the globe, key policy debates continue around whether Uber and other ride-hailing services are contributing to this trend. This research explores the effects of the introduction of ride-hailing to Colombian cities on public transportation ridership using Ubers timeline as case study. We test the hypothesis that ride-hailing may either substitute or compete with public transit, particularly in cities with large transit service gaps in coverage or quality. Our analysis builds on historic transit ridership data from national authorities and uses a staggered difference-in-difference model that accounts for fixed effects, seasonality, socioeconomic controls, and the presence of integrated transport systems. Despite large reductions in transit ridership in most cities, our results suggest that Uber is not statistically associated with the observed drop in ridership. Moreover, consistent with evidence from previous research, public transit reforms implemented between 2007 and 2015 throughout Colombian cities appear to have contributed substantially to the declines in transit ridership observed across the country. Findings in this paper inform policy-targeted insights and contribute to current debates of the links between ride-hailing and public transit in cities in Latin America.
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Harter, Rachel, Joseph McMichael, and S. Grace Deng. New Approach for Handling Drop Point Addresses in Mail/ Web Surveys. RTI Press, August 2022. http://dx.doi.org/10.3768/rtipress.2022.op.0074.2209.

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The purpose of this paper is to introduce the concept of drop unit substitution in address-based samples for mail and web surveys. A drop point is a single US Postal Service (USPS) delivery point or receptacle that services multiple businesses, families, or households (USPS, 2017). Residential drop units are the individual housing units served by the drop point address. For the most part, address-based sampling frames list the number of units at a drop point address but will not contain information identifying specific units. Drop units comprise less than 2 percent of all residential addresses in the United States (McMichael, 2017), but they tend to be concentrated in certain large cities. In Queens, New York, for example, drop units constitute 27 percent of residential housing units. The problem with drop units for address-based surveys with mail contacts is that, without names or unit identifiers, there is no way to control which unit receives the various mailings. This limitation leads to distorted selection probabilities, renders the use of cash incentives by mail impractical, and precludes traditional methods for mail nonresponse follow-up, thus resulting in higher nonresponse. Alternatively, excluding drop units results in coverage error, which can be considerable for some subnational estimates. The authors propose a substitution approach when a drop unit is sampled—in other words, replacing the unit with a similar nearby unit in a non–drop point building.
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Indonesia: Train journalists to write about reproductive health. Population Council, 2001. http://dx.doi.org/10.31899/rh2001.1016.

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After government control over the media was liberalized in 1998, Indonesian journalists had a new mandate to explore new issues and foster public debate. Several studies had found evidence that women’s health worsened from 1997–99, yet media coverage of this topic was limited. To increase press coverage of reproductive health (RH) topics, the Population Council conducted an 18-month media project in collaboration with the State Ministry for Women’s Empowerment and other key agencies. The project focused on improving RH knowledge and reporting skills among 22 print journalists. Project staff monitored RH coverage in 22 major newspapers, magazines, and tabloids. After Indonesian journalists received background information and training on RH issues, the quality of their coverage improved. However, as noted in this brief, continued efforts are needed to provide media representatives with ideas for news stories and feature articles and training in use of research findings.
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