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https://www.readbyqxmd.com/read/30551675/research-on-rss-data-optimization-and-dfl-localization-for-non-empty-environments
#1
Wenyu Mao, Rongxuan Shen, Ke Wang, Guoliang Gong, Yi Xiao, Huaxiang Lu
Device-free localization (DFL) is a new technique which can estimate the target location through analyzing the shadowing effect on surrounding radio frequency (RF) links. In a relatively complex environment, the influences of random disturbance and the multipath effect are more serious. There are kinds of noises and disturbances in the received signal strength (RSS) data of RF links and the data itself can even be distorted, which will seriously affect the DFL accuracy. Most of the common filtering methods adopted in DFL field are not targeted and the filtering effects are unstable...
December 13, 2018: Sensors
https://www.readbyqxmd.com/read/30551674/integration-of-satellite-data-with-high-resolution-ratio-improvement-of-spectral-quality-with-preserving-spatial-details
#2
Aleksandra Sekrecka, Michal Kedzierski
Commonly used image fusion techniques generally produce good results for images obtained from the same sensor, with a standard ratio of spatial resolution (1:4). However, an atypical high ratio of resolution reduces the effectiveness of fusion methods resulting in a decrease in the spectral or spatial quality of the sharpened image. An important issue is the development of a method that allows for maintaining simultaneous high spatial and spectral quality. The authors propose to strengthen the pan-sharpening methods through prior modification of the panchromatic image...
December 13, 2018: Sensors
https://www.readbyqxmd.com/read/30551661/relay-assisted-d2d-transmission-for-mobile-health-applications
#3
Hongcheng Huang, Wei Xiang, Yang Tao, Biao Liu, Min Hu
Relay-assisted Device-to-Device (D2D) communication, one of the important transmission modes in mobile health systems, can provide high transmission quality for servicing users at the edge of system coverage. However, the quality of the D2D relay communication is largely limited by the relay nodes. When a poor node is selected to assist the source node in the data transmission, it is likely to result in the loss of medical data and inaccurate transmission. Therefore, this paper focuses on how to select relay modes and relay nodes to improve the reliability of medical data transmission...
December 13, 2018: Sensors
https://www.readbyqxmd.com/read/30551651/time-matching-random-finite-set-based-filter-for-radar-multi-target-tracking
#4
Defu Jiang, Ming Liu, Yiyue Gao, Yang Gao, Wei Fu, Yan Han
The random finite set (RFS) approach provides an elegant Bayesian formulation of the multi-target tracking (MTT) problem without the requirement of explicit data association. In order to improve the performance of the RFS-based filter in radar MTT applications, this paper proposes a time-matching Bayesian filtering framework to deal with the problem caused by the diversity of target sampling times. Based on this framework, we develop a time-matching joint generalized labeled multi-Bernoulli filter and a time-matching probability hypothesis density filter...
December 13, 2018: Sensors
https://www.readbyqxmd.com/read/30551646/fluorescence-hyperspectral-imaging-of-oil-samples-and-its-quantitative-applications-in-component-analysis-and-thickness-estimation
#5
Wentao Jiang, Jingwei Li, Xinli Yao, Erik Forsberg, Sailing He
The fast response and analysis of oil spill accidents is important but remains challenging. Here, a compact fluorescence hyperspectral system based on a grating-prism structure able to perform component analysis of oil as well as make a quantitative estimation of oil film thickness is developed. The spectrometer spectral range is 366⁻814 nm with a spectral resolution of 1 nm. The feasibility of the spectrometer system is demonstrated by determining the composition of three types of crude oil and various mixtures of them...
December 13, 2018: Sensors
https://www.readbyqxmd.com/read/30551639/development-of-high-frequency-60-mhz-intravascular-ultrasound-ivus-transducer-by-using-asymmetric-electrodes-for-improved-beam-profile
#6
Jin Ho Sung, Jong Seob Jeong
In most commercial single-element intravascular ultrasound (IVUS) transducers, with 20 MHz to 40 MHz center frequencies, a conductive adhesive is used to bond a micro-sized cable for the signal line to the surface of the transducer aperture (<1 mm × 1 mm size) where ultrasound beam is generated. Therefore, the vibration of the piezoelectric layer is significantly disturbed by the adhesive with the signal line, thereby causing problems, such as reduced sensitivity, shortened penetration depth, and distorted beam profile...
December 13, 2018: Sensors
https://www.readbyqxmd.com/read/30551636/comparing-rgb-d-sensors-for-close-range-outdoor-agricultural-phenotyping
#7
Adar Vit, Guy Shani
Phenotyping is the task of measuring plant attributes for analyzing the current state of the plant. In agriculture, phenotyping can be used to make decisions concerning the management of crops, such as the watering policy, or whether to spray for a certain pest. Currently, large scale phenotyping in fields is typically done using manual labor, which is a costly, low throughput process. Researchers often advocate the use of automated systems for phenotyping, relying on the use of sensors for making measurements...
December 13, 2018: Sensors
https://www.readbyqxmd.com/read/30551635/optimization-design-method-of-a-new-stabilized-platform-based-on-missile-borne-semi-strap-down-inertial-navigation-system
#8
Jie Li, Zhengyao Jing, Xi Zhang, Jiayu Zhang, Jinqiang Li, Shiyao Gao, Tao Zheng
At present, existing wide range Micro-Electro-Mechanical-Systems (MEMS) inertial sensors have relatively lower precision and direct measurement of the missile's high-rotation motion inevitably uses a large-range sensor. To achieve high-precision navigation, this paper proposes a novel Semi-strap-down Stabilized Platform (SSP) based on the Missile-borne Semi-Strap-down Inertial Navigation System, which is used to mount sensors and lowers sensor range requirements through isolating the high-rotational motion of missile...
December 13, 2018: Sensors
https://www.readbyqxmd.com/read/30551627/self-calibration-and-performance-control-of-mems-with-applications-for-iot
#9
Jason Clark
A systemic problem for microelectromechanical systems (MEMS) has been the large gap between their predicted and actual performances. Due to process variations, no two MEMS have been able to perform identically. In-factory calibration is often required, which can represent as much as three-fourths of the manufacturing costs. Such issues are challenges for microsensors that require higher accuracy and lower cost. Towards addressing these issues, this paper describes how microscale attributes may be used to enable MEMS to accurately calibrate themselves without external references, or enable actual devices to match their predicted performances...
December 13, 2018: Sensors
https://www.readbyqxmd.com/read/30551626/gas-sensing-properties-of-in%C3%A2-o%C3%A2-nano-films-obtained-by-low-temperature-pulsed-electron-deposition-technique-on-alumina-substrates
#10
Tommaso Addabbo, Mara Bruzzi, Ada Fort, Marco Mugnaini, Valerio Vignoli
Nanostructured Indium(III) oxide (In₂O₃) films deposited by low temperature pulsed electron deposition (LPED) technique on customized alumina printed circuit boards have been manufactured and characterized as gas sensing devices. Their electrical properties have monitored directly during deposition to optimize their sensing performance. Experimental results with oxidizing (NO₂) as well as reducing (CO) gases in both air and inert gas carriers are discussed and modeled.
December 13, 2018: Sensors
https://www.readbyqxmd.com/read/30551621/echo-preprocessing-to-enhance-snr-for-2d-cs-based-isar-imaging-method
#11
Zhiping Yin, Xinfei Lu, Weidong Chen
A new CS-based inverse synthetic aperture radar (ISAR) imaging framework is proposed to enhance both the image performance and the robustness at a low SNR. An ISAR echo preprocessing method for enhancing the ISAR imaging quality of compressed sensing (CS) based algorithms is developed by implementing matched filtering, echo denoising and matrix optimization sequentially. After the preprocessing, the two-dimensional (2D) SL0 algorithm is applied to reconstruct an ISAR image in the range and cross-range plane through a series of 2D matrices using the 2D CS theory, rather than converting the 2D convex optimization problem to the one-dimensional (1D) problem in the image reconstruction process...
December 13, 2018: Sensors
https://www.readbyqxmd.com/read/30551612/efficient-path-planning-and-truthful-incentive-mechanism-design-for-mobile-crowdsensing
#12
Xi Tao, Wei Song
Mobile crowdsensing (MCS) is a promising paradigm for large-scale sensing. A group of users are recruited as workers to accomplish various sensing tasks and provide data to the platform and requesters. A key problem in MCS is to design the incentive mechanism, which can attract enough workers to participate in sensing activities and maintain the truthfulness. As the main advantage of MCS, user mobility is a factor that must be considered. We make an attempt to build a technical framework for MCS, which is associated with a truthful incentive mechanism taking the movements of numerous workers into account...
December 13, 2018: Sensors
https://www.readbyqxmd.com/read/30551587/sensing-performance-and-efficiency-of-two-energy-transfer-based-two-photon-fluorescent-probes-for-ph
#13
Yujin Zhang, Wei Hu
The design and synthesis of fluorescent probes for monitoring pH values inside living cells have attracted great attention, due to the important role pH plays in many biological processes. In this study, the optical properties of two different two-photon fluorescent probes for pH are studied. The ratiometric sensing of the probes are theoretically illustrated. Meanwhile, the recognitional mechanisms of the probes are investigated, which shows the energy transfer process when react with H⁺. Specially, the calculated results demonstrate that Probe1 possesses a higher energy transfer efficiency and a larger two-photon absorption cross-section than Probe2, indicating it to be a preferable pH fluorescent probe...
December 13, 2018: Sensors
https://www.readbyqxmd.com/read/30551582/assessment-of-the-accuracy-of-a-multi-beam-led-scanner-sensor-for-measuring-olive-canopies
#14
Rafael R Sola-Guirado, Sergio Bayano-Tejero, Antonio Rodríguez-Lizana, Jesús A Gil-Ribes, Antonio Miranda-Fuentes
Canopy characterization has become important when trying to optimize any kind of agricultural operation in high-growing crops, such as olive. Many sensors and techniques have reported satisfactory results in these approaches and in this work a 2D laser scanner was explored for measuring canopy trees in real-time conditions. The sensor was tested in both laboratory and field conditions to check its accuracy, its cone width, and its ability to characterize olive canopies in situ. The sensor was mounted on a mast and tested in laboratory conditions to check: (i) its accuracy at different measurement distances; (ii) its measurement cone width with different reflectivity targets; and (iii) the influence of the target's density on its accuracy...
December 13, 2018: Sensors
https://www.readbyqxmd.com/read/30551579/a-simple-graphene-nh%C3%A2-gas-sensor-via-laser-direct-writing
#15
Dezhi Wu, Qianqian Peng, Shan Wu, Guangshun Wang, Lei Deng, Huiling Tai, Lingyun Wang, Yajie Yang, Linxi Dong, Yang Zhao, Jinbao Zhao, Daoheng Sun, Liwei Lin
Ammonia gas sensors are very essential in many industries and everyday life. However, their complicated fabrication process, severe environmental fabrication requirements and desorption of residual ammonia molecules result in high cost and hinder their market acceptance. Here, laser direct writing is used to fabricate three parallel porous 3D graphene lines on a polyimide (PI) tape to simply construct an ammonia gas sensor. The middle one works as an ammonia sensing element and the other two on both sides work as heaters to improve the desorption performance of the sensing element to ammonia gas molecules...
December 13, 2018: Sensors
https://www.readbyqxmd.com/read/30551568/data-exchange-interoperability-in-iot-ecosystem-for-smart-parking-and-ev-charging
#16
Anastasiia Karpenko, Tuomas Kinnunen, Manik Madhikermi, Jeremy Robert, Kary Främling, Bhargav Dave, Antti Nurminen
Many domains are trying to integrate with the Internet of Things (IoT) ecosystem, such as public administrations starting smart city initiatives all over the world. Cities are becoming smart in many ways: smart mobility, smart buildings, smart environment and so on. However, the problem of non-interoperability in the IoT hinders the seamless communication between all kinds of IoT devices. Different domain specific IoT applications use different interoperability standards. These standards are usually not interoperable with each other...
December 13, 2018: Sensors
https://www.readbyqxmd.com/read/30551566/estimating-pore-water-electrical-conductivity-of-sandy-soil-from-time-domain-reflectometry-records-using-a-time-varying-dynamic-linear-model
#17
Basem Aljoumani, Jose A Sanchez-Espigares, Gerd Wessolek
Despite the importance of computing soil pore water electrical conductivity ( σp ) from soil bulk electrical conductivity ( σb ) in ecological and hydrological applications, a good method of doing so remains elusive. The Hilhorst concept offers a theoretical model describing a linear relationship between σb , and relative dielectric permittivity ( εb ) in moist soil. The reciprocal of pore water electrical conductivity (1/ σp ) appears as a slope of the Hilhorst model and the ordinary least squares (OLS) of this linear relationship yields a single estimate ( 1 / σ p ^ ) of the regression parameter vector ( σp ) for the entire data...
December 13, 2018: Sensors
https://www.readbyqxmd.com/read/30551558/microfluidic-preconcentration-chip-with-self-assembled-chemical-modified-surface-for-trace-carbonyl-compounds-detection
#18
Jie Cheng, Jianwei Shao, Yifei Ye, Yang Zhao, Chengjun Huang, Li Wang, Mingxiao Li
Carbonyl compounds in water sources are typical characteristic pollutants, which are important indicators in the health risk assessment of water quality. Commonly used analytical chemistry methods face issues such as complex operations, low sensitivity, and long analysis times. Here, we report a silicon microfluidic device based on click chemical surface modification that was engineered to achieve rapid, convenient and efficient capture of trace level carbonyl compounds in liquid solvent. The micro pillar arrays of the chip and microfluidic channels were designed under the basis of finite element (FEM) analysis and fabricated by the microelectromechanical systems (MEMS) technique...
December 13, 2018: Sensors
https://www.readbyqxmd.com/read/30545150/integrated-ground-based-sar-interferometry-terrestrial-laser-scanner-and-corner-reflector-deformation-experiments
#19
Xiangtian Zheng, Xiaolin Yang, Haitao Ma, Guiwen Ren, Keli Zhang, Feng Yang, Ce Li
An integrated sensor system comprised of a terrestrial laser scanner (TLS), corner reflectors (CRs), and high precision linear rail is utilized to validate ground-based synthetic aperture radar (GB-SAR) interferometric micro-displacement measurements. A rail with positioning accuracy of 0.1 mm is deployed to ensure accurate and controllable deformation. The rail is equipped with a CR on a sliding platform for mobility. Three smaller CRs are installed nearby, each with a reflective sticker attached to the CR's vertex; the CRs present as high-amplitude points both in the GB-SAR images and the TLS point cloud to allow for accurate data matching...
December 12, 2018: Sensors
https://www.readbyqxmd.com/read/30545149/security-cost-aware-data-communication-in-low-power-iot-sensors-with-energy-harvesting
#20
Xiaolin Fang, Ming Yang, Wenjia Wu
Security is a critical concern in low-power IoT (Internet of Things) wireless sensors because these resource constrained devices are easy to attack and meanwhile the energy constraint sensors will consume a lot of energy to run algorithms for security purposes. We study the energy efficiency data transmission problem in IoT sensors that use capacitors to harvest wireless energy while considering the energy cost for running security algorithms. Energy harvesting with capacitors has the characteristic that the energy harvesting rate varies over time, and it is getting slower and slower as the capacitor gets more and more wireless energy...
December 12, 2018: Sensors
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