28 papers · ranked by Valyu relevance
Sotiris Papatheodorou, Anthony Tzes, Yiannis Stergiopoulos
This article examines the problem of visual area coverage by a network of Mobile Aerial Agents (MAAs). Each MAA is assumed to be equipped with a downwards facing camera with a conical field of view which covers all points within a circle on the ground. The diameter of that circle is proportional to the altitude of the…
Sotiris Papatheodorou, Anthony Tzes, Yiannis Stergiopoulos
— This article addresses the visual area coverage problem using a team of Unmanned Aerial Vehicles (UAVs). The UAVs are assumed to be equipped with a downward facing camera covering all points of interest within a circle on the ground. The diameter of this circular conic-section increases as the UAV flies at a larger…
Ahmed Saeed, Ahmed Abdelkader, Mouhyemen Khan, Azin Neishaboori + 2 more
'Khaled A. Harras' 'Amr Mohamed'] Low-cost mini-drones with advanced sensing and maneuverability enable a new class of intelligent sensing systems. To achieve the full potential of such drones, it is necessary to develop new enhanced formulations of both common and emerging sensing scenarios. Namely, several…
Sotiris Papatheodorou, Anthony Tzes
— The objective in this article is to develop a control strategy for coverage purposes of a convex region by a fleet of Mobile Aerial Agents (MAAs). Each MAA is equipped with a downward facing camera that senses a convex portion of the area while its altitude flight is constrained. Rather than relying on typical…
Guanglin Zhang, Shan You, Jiajie Ren, Demin Li + 2 more
In this paper, we study the area coverage of directional sensor networks (DSNs) with random node distribution. The coverage of DSNs depends on the sensor’s locations, the sensing radiuses, and the working directions, as well as the angle of view (AoV), which is challenging to analyze. We transform the network area…
Vyacheslav Zalyubovskiy, Adil Erzin, Sergey Astrakov, Hyunseung Choo
In wireless sensor networks, density control is an important technique for prolonging a network’s lifetime. To reduce the overall energy consumption, it is desirable to minimize the overlapping sensing area of the sensor nodes. In this paper, we study the problem of energy-efficient area coverage by the regular…
Ahmad Sawalmeh, Noor Shamsiah Othman, Hazim Shakhatreh
In this paper, the efficient 3D placement of UAV as an aerial base station in providing wireless coverage for users in a small and large coverage area is investigated. In the case of providing wireless coverage for outdoor and indoor users in a small area, the Particle Swarm Optimization (PSO) and K-means with Ternary…
Fu Xiao, Yang Yang, Ruchuan Wang, Lijuan Sun
Coverage pattern and deployment strategy are directly related to the optimum allocation of limited resources for wireless sensor networks, such as energy of nodes, communication bandwidth, and computing power, and quality improvement is largely determined by these for wireless sensor networks. A three-dimensional…
Pengju Si, Chengdong Wu, Yunzhou Zhang, Zixi Jia + 2 more
Barrier coverage, an important research area with respect to camera sensor networks, consists of a number of camera sensors to detect intruders that pass through the barrier area. Existing works on barrier coverage such as local face-view barrier coverage and full-view barrier coverage typically assume that each…
Hassan Chizari, Majid Hosseini, Timothy Poston, Shukor Abd Razak + 1 more
'Abdul Hanan Abdullah'] Sensing and communication coverage are among the most important trade-offs in Wireless Sensor Network (WSN) design. A minimum bound of sensing coverage is vital in scheduling, target tracking and redeployment phases, as well as providing communication coverage. Some methods measure the coverage…
Pablo Navarro Acero, Stephan Mohr, Marco Bernabei, Carlos Fernandez + 2 more
The performance of lubricant additives, such as organic friction modifiers (OFMs), depends critically on their ability to adsorb onto the surfaces of moving components and form protective self-assembled layers (SAMs). Therefore, understanding the relationship between the concentration of the additive in the base oil…
Tarun Mangla, Esther Showalter, Vivek Adarsh, Kipp Jones + 3 more
'Morgan Vigil-Hayes' 'Elizabeth Belding' 'Ellen Zegura'] Understanding and improving mobile broadband deployment is critical to bridging the digital divide and targeting future investments. Yet accurately mapping mobile coverage is challenging. In 2019, the Federal Communications Commission (FCC) released a report on…
Hao Lin, Mustafa A. Kishk, Mohamed‐Slim Alouini
Percolation Theory on a Sphere Authors: ['Hao Lin' 'Mustafa A. Kishk' 'Mohamed‐Slim Alouini'] Abstract—With the advent of the 6G era, global connectivity has become a common goal in the evolution of communications, aiming to bring Internet services to more unconnected regions. Additionally, the rise of applications…
Matthew H. E. M. Browning, Alessandro Rigolon, Scott Ogletree, Ruoyu Wang + 4 more
'Ruoyu Wang' 'Jochem O. Klompmaker' 'Christopher Bailey' 'Ryan Gagnon' 'Peter James'] Most spatial epidemiological studies of nature-health relationships use generalized greenspace measures. For instance, coarse-resolution spatial data containing normalized difference vegetative index (NDVI) values are prominent…
Luke J. Sutton, David L. Anderson, Miguel Franco, Christopher J.W. McClure + 4 more
Quantifying habitat use is important for understanding how animals meet their requirements for survival and provides useful information for conservation planning. Currently, assessments of range-wide habitat use that delimit species distributions are incomplete for many taxa. The harpy eagle (Harpia harpyja) is a…
Katherine Pulido Chadid, Carsten Rahbek, Jonas Geldmann
Protected areas (PAs) are vital for nature conservation, yet evidence shows that pressure on biodiversity is increasing despite their global expansion. Using threat probability maps based on the IUCN Red List and PA data, we analyzed the relationship between PA coverage and the major threats—agriculture, hunting…
Takayuki Shiono, Yasuhiro Kubota, Buntarou Kusumoto
To reframe the imperfect review processes of nation-scale actions on area-based conservation through protected area (PA) networks, we first created novel infrastructure to visualize nation-level biodiversity information in Japan. We then assessed the performance of the existing PA network relative to land exploitation…
Harith Farooq, Alexandre Antonelli, Søren Faurby
Eight percent of all land surface has been designated as “Key Biodiversity Areas” (KBAs). Since these areas were established based on only two percent of all terrestrial species estimated to exist, we ask what would happen if we used all species on Earth to identify additional KBAs. We explore this question at a global…
D. Scott Rinnan, Yanina Sica, Ajay Ranipeta, John Wilshire + 1 more
Area-based conservation through reserves or other measures is vital for preserving biodiversity and its functions for future generations^1–5^, but its effective implementation suffers from a lack of both spatial detail necessary for management practices^6^ and transparency around national responsibilities that might…
Authors not listed
Monolayer graphene is a suitable active material for several electronics and sensor applications, for which large-area individual sheets are necessary on insulating substrates. Chemical vapor deposition (CVD) enables the synthesis of large-area graphene of high quality on metallic supports. However, graphene grown in…
Sarah Mogg, Constance Fastre, Piero Visconti
Over a quarter of species assessed by the IUCN Red List are threatened with extinction. A global commitment to protect 17% of land and 10% of the oceans by 2020 is close to being achieved, but with limited ecological impacts due to its inadequacy and poor enforcement. Here, we reverse-engineer IUCN Red List criteria to…
Abigail Dommer, Nicholas Wauer, Kyle Angle, Aakash Davasam + 6 more
Sea spray aerosol (SSA) ejected through bursting bubbles at the ocean surface are complex mixtures of salts and organic species. Composition affects their ability to form marine clouds which cover nearly three-quarters of the Earth and play a critical role in the climate system. Submicron SSA particles have long…
Meng Jia, Troy Sorensen, Dorit Hammerling
We propose a generic, modular framework to optimize the placement of continuous monitoring sensors on oil and gas sites aiming to maximize the methane emissions detection efficiency. Our proposed framework substantially expands the problem scale compared to previous related studies and can be adapted for different…
Luke J. Sutton, Jayson C. Ibañez, Dennis I. Salvador, Rowell L. Taraya + 3 more
Many range-restricted taxa are currently experiencing population declines yet lack fundamental information regarding distribution and population size. Establishing baseline estimates for both these key biological parameters is however critical for directing conservation planning for at-risk range-restricted species.…
Sarah Chambliss, Carlos Pinon, Kyle Messier, Brian LaFranchi + 5 more
Disparity in air pollution exposure arises from variation at multiple spatial scales: along urbanto-rural gradients, between individual cities within a metropolitan region, within individual neighborhoods, and between city blocks. Here, we improve on existing capabilities to systematically compare urban variation at…
Elma Avdic, Irene Macaluso, Nicola Marchetti, Doyle Linda
—Flexible licensing model is a necessary enabler of the technical and procedural complexities of Spectrum Access System (SAS)-based sharing framework. The purpose of this study is to explore the effectiveness of 3.5GHz Licensing Framework - based on census tracts as area units, areas whose main characteristic is…
Lucien Roach, David Gonzalez‑Rodriguez, Jie Gao, Eric Laurichesse + 6 more
The process of convectively self‑assembling particles in films suffers from low reproducibility due to its high dependency on particle concentration, as well as a variety of interactions and physical parameters. Inhomogeneities in flow rates and instabilities at the air‑liquid interface are mostly responsible for…
Authors not listed
This work focuses on the impact of lateral interactions on the thermophysical properties of adsorbates. We present different parameterizations for coverage-dependent enthalpy, entropy, and heat capacity in a mean-field microkinetic model. These models are tested against two systems, CO/Pt(111) and CO/Co(0001), using…