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https://www.readbyqxmd.com/read/28726762/user-interaction-modeling-and-profile-extraction-in-interactive-systems-a-groupware-application-case-study
#1
Cristina Tîrnăucă, Rafael Duque, José L Montaña
A relevant goal in human-computer interaction is to produce applications that are easy to use and well-adjusted to their users' needs. To address this problem it is important to know how users interact with the system. This work constitutes a methodological contribution capable of identifying the context of use in which users perform interactions with a groupware application (synchronous or asynchronous) and provides, using machine learning techniques, generative models of how users behave. Additionally, these models are transformed into a text that describes in natural language the main characteristics of the interaction of the users with the system...
July 20, 2017: Sensors
https://www.readbyqxmd.com/read/28726755/control-measurements-of-crane-rails-performed-by-terrestrial-laser-scanning
#2
Klemen Kregar, Jan Možina, Tomaž Ambrožič, Dušan Kogoj, Aleš Marjetič, Gašper Štebe, Simona Savšek
This article presents a method for measuring the geometry of crane rails with terrestrial laser scanning (TLS). Two sets of crane rails were divided into segments, their planes were adjusted, and the characteristic rail lines were defined. We used their profiles to define the positional and altitude deviations of the rails, the span and height difference between the two rails, and we also verified that they complied with the Eurocode 3 standard. We tested the method on crane rails at the hydroelectric power plant in Krško and the thermal power plant in Brestanica...
July 20, 2017: Sensors
https://www.readbyqxmd.com/read/28726754/identification-of-load-categories-in-rotor-system-based-on-vibration-analysis
#3
Kun Zhang, Zhaojian Yang
Rotating machinery is often subjected to variable loads during operation. Thus, monitoring and identifying different load types is important. Here, five typical load types have been qualitatively studied for a rotor system. A novel load category identification method for rotor system based on vibration signals is proposed. This method is a combination of ensemble empirical mode decomposition (EEMD), energy feature extraction, and back propagation (BP) neural network. A dedicated load identification test bench for rotor system was developed...
July 20, 2017: Sensors
https://www.readbyqxmd.com/read/28726751/an-adaptive-feature-learning-model-for-sequential-radar-high-resolution-range-profile-recognition
#4
Xuan Peng, Xunzhang Gao, Yifan Zhang, Xiang Li
This paper proposes a new feature learning method for the recognition of radar high resolution range profile (HRRP) sequences. HRRPs from a period of continuous changing aspect angles are jointly modeled and discriminated by a single model named the discriminative infinite restricted Boltzmann machine (Dis-iRBM). Compared with the commonly used hidden Markov model (HMM)-based recognition method for HRRP sequences, which requires efficient preprocessing of the HRRP signal, the proposed method is an end-to-end method of which the input is the raw HRRP sequence, and the output is the label of the target...
July 20, 2017: Sensors
https://www.readbyqxmd.com/read/28726746/crack-detection-in-concrete-tunnels-using-a-gabor-filter-invariant-to-rotation
#5
Roberto Medina, José Llamas, Jaime Gómez-García-Bermejo, Eduardo Zalama, Miguel José Segarra
In this article, a system for the detection of cracks in concrete tunnel surfaces, based on image sensors, is presented. Both data acquisition and processing are covered. Linear cameras and proper lighting are used for data acquisition. The required resolution of the camera sensors and the number of cameras is discussed in terms of the crack size and the tunnel type. Data processing is done by applying a new method called Gabor filter invariant to rotation, allowing the detection of cracks in any direction...
July 20, 2017: Sensors
https://www.readbyqxmd.com/read/28726745/dual-source-linear-energy-prediction-line-p-model-in-the-context-of-wsns
#6
Faisal Ahmed, Gert Tamberg, Yannick Le Moullec, Paul Annus
Energy harvesting technologies such as miniature power solar panels and micro wind turbines are increasingly used to help power wireless sensor network nodes. However, a major drawback of energy harvesting is its varying and intermittent characteristic, which can negatively affect the quality of service. This calls for careful design and operation of the nodes, possibly by means of, e.g., dynamic duty cycling and/or dynamic frequency and voltage scaling. In this context, various energy prediction models have been proposed in the literature; however, they are typically compute-intensive or only suitable for a single type of energy source...
July 20, 2017: Sensors
https://www.readbyqxmd.com/read/28726738/scheduling-for-emergency-tasks-in-industrial-wireless-sensor-networks
#7
Changqing Xia, Xi Jin, Linghe Kong, Peng Zeng
Wireless sensor networks (WSNs) are widely applied in industrial manufacturing systems. By means of centralized control, the real-time requirement and reliability can be provided by WSNs in industrial production. Furthermore, many approaches reserve resources for situations in which the controller cannot perform centralized resource allocation. The controller assigns these resources as it becomes aware of when and where accidents have occurred. However, the reserved resources are limited, and such incidents are low-probability events...
July 20, 2017: Sensors
https://www.readbyqxmd.com/read/28726729/online-denoising-based-on-the-second-order-adaptive-statistics-model
#8
Sheng-Lun Yi, Xue-Bo Jin, Ting-Li Su, Zhen-Yun Tang, Fa-Fa Wang, Na Xiang, Jian-Lei Kong
Online denoising is motivated by real-time applications in the industrial process, where the data must be utilizable soon after it is collected. Since the noise in practical process is usually colored, it is quite a challenge for denoising techniques. In this paper, a novel online denoising method was proposed to achieve the processing of the practical measurement data with colored noise, and the characteristics of the colored noise were considered in the dynamic model via an adaptive parameter. The proposed method consists of two parts within a closed loop: the first one is to estimate the system state based on the second-order adaptive statistics model and the other is to update the adaptive parameter in the model using the Yule-Walker algorithm...
July 20, 2017: Sensors
https://www.readbyqxmd.com/read/28726728/a-novel-physical-sensing-principle-for-liquid-characterization-using-paper-based-hygro-mechanical-systems-pb-hms
#9
Angel Perez-Cruz, Ion Stiharu, Aurelio Dominguez-Gonzalez
In recent years paper-based microfluidic systems have emerged as versatile tools for developing sensors in different areas. In this work; we report a novel physical sensing principle for the characterization of liquids using a paper-based hygro-mechanical system (PB-HMS). The PB-HMS is formed by the interaction of liquid droplets and paper-based mini-structures such as cantilever beams. The proposed principle takes advantage of the hygroscopic properties of paper to produce hygro-mechanical motion. The dynamic response of the PB-HMS reveals information about the tested liquid that can be applied to characterize certain properties of liquids...
July 20, 2017: Sensors
https://www.readbyqxmd.com/read/28726726/leds-sources-and-intrinsically-bandwidth-limited-detectors
#10
Roberto Filippo, Emanuele Taralli, Mauro Rajteri
The increasing demand for light emitting diodes (LEDs) is driven by a number of application categories, including display backlighting, communications, signage, and general illumination. Nowadays, they have also become attractive candidates as new photometric standards. In recent years, LEDs have started to be applied as wavelength-selective photo-detectors as well. Nevertheless, manufacturers' datasheets are limited about LEDs used as sources in terms of degradation with operating time (aging) or shifting of the emission spectrum as a function of the forward current...
July 20, 2017: Sensors
https://www.readbyqxmd.com/read/28726724/theoretical-studies-on-two-photon-fluorescent-hg-2-probes-based-on-the-coumarin-rhodamine-system
#11
Yujin Zhang, Jiancai Leng
The development of fluorescent sensors for Hg(2+) has attracted much attention due to the well-known adverse effects of mercury on biological health. In the present work, the optical properties of two newly-synthesized Hg(2+) chemosensors based on the coumarin-rhodamine system (named Pro1 and Pro2) were systematically investigated using time-dependent density functional theory. It is shown that Pro1 and Pro2 are effective ratiometric fluorescent Hg(2+) probes, which recognize Hg(2+) by Förster resonance energy transfer and through bond energy transfer mechanisms, respectively...
July 20, 2017: Sensors
https://www.readbyqxmd.com/read/28718826/enhanced-strain-measurement-range-of-an-fbg-sensor-embedded-in-seven-wire-steel-strands
#12
Jae-Min Kim, Chul-Min Kim, Song-Yi Choi, Bang Yeon Lee
FBG sensors offer many advantages, such as a lack of sensitivity to electromagnetic waves, small size, high durability, and high sensitivity. However, their maximum strain measurement range is lower than the yield strain range (about 1.0%) of steel strands when embedded in steel strands. This study proposes a new FBG sensing technique in which an FBG sensor is recoated with polyimide and protected by a polyimide tube in an effort to enhance the maximum strain measurement range of FBG sensors embedded in strands...
July 18, 2017: Sensors
https://www.readbyqxmd.com/read/28718804/electromagnetic-differential-measuring-method-application-in-microstrip-sensors-developing
#13
Francisco Javier Ferrández-Pastor, Juan Manuel García-Chamizo, Mario Nieto-Hidalgo
Electromagnetic radiation is energy that interacts with matter. The interaction process is of great importance to the sensing applications that characterize material media. Parameters like constant dielectric represent matter characteristics and they are identified using emission, interaction and reception of electromagnetic radiation in adapted environmental conditions. How the electromagnetic wave responds when it interacts with the material media depends on the range of frequency used and the medium parameters...
July 18, 2017: Sensors
https://www.readbyqxmd.com/read/28718796/hydrostatic-pressure-and-temperature-measurements-using-an-in-line-mach-zehnder-interferometer-based-on-a-two-mode-highly-birefringent-microstructured-fiber
#14
Gabriela Statkiewicz-Barabach, Jacek Olszewski, Pawel Mergo, Waclaw Urbanczyk
We present a comprehensive study of an in-line Mach-Zehnder intermodal interferometer fabricated in a boron-doped two-mode highly birefringent microstructured fiber. We observed different interference signals at the output of the interferometer, related to the intermodal interference of the fundamental and the first order modes of the orthogonal polarizations and a beating of the polarimetric signal related to the difference in the group modal birefringence between the fundamental and the first order modes, respectively...
July 18, 2017: Sensors
https://www.readbyqxmd.com/read/28718793/detection-of-guanine-and-adenine-using-an-aminated-reduced-graphene-oxide-functional-membrane-modified-glassy-carbon-electrode
#15
Di Li, Xiao-Lu Yang, Bao-Lin Xiao, Fang-Yong Geng, Jun Hong, Nader Sheibani, Ali Akbar Moosavi-Movahedi
A new electrochemical sensor based on a Nafion, aminated reduced graphene oxide and chitosan functional membrane-modified glassy carbon electrode was proposed for the simultaneous detection of adenine and guanine. Fourier transform-infrared spectrometry (FTIR), transmission electron microscopy (TEM), and electrochemical methods were utilized for the additional characterization of the membrane materials. The prepared electrode was utilized for the detection of guanine (G) and adenine (A). The anodic peak currents to G and A were linear in the concentrations ranging from 0...
July 18, 2017: Sensors
https://www.readbyqxmd.com/read/28718790/preliminary-study-of-uas-equipped-with-thermal-camera-for-volcanic-geothermal-monitoring-in-taiwan
#16
Shih-Hong Chio, Cheng-Horng Lin
Thermal infrared cameras sense the temperature information of sensed scenes. With the development of UASs (Unmanned Aircraft Systems), thermal infrared cameras can now be carried on a quadcopter UAV (Unmanned Aircraft Vehicle) to appropriately collect high-resolution thermal images for volcanic geothermal monitoring in a local area. Therefore, the quadcopter UAS used to acquire thermal images for volcanic geothermal monitoring has been developed in Taiwan as part of this study to overcome the difficult terrain with highly variable topography and extreme environmental conditions...
July 18, 2017: Sensors
https://www.readbyqxmd.com/read/28718789/flavonoid-and-antioxidant-capacity-of-propolis-prediction-using-near-infrared-spectroscopy
#17
Eddy Betances-Salcedo, Isabel Revilla, Ana M Vivar-Quintana, M Inmaculada González-Martín
The use of propolis as a dietary supplement or as an ingredient in different food products is increasing, due to its antioxidant and bactericidal properties. These nutritional properties directly depend on its phenolic composition. For this reason, this study analysed the total contents of flavones and flavonols, flavanones and dihydroflavonols, and the antioxidant capacity by using the methods of ABTS and linoleic acid/β-carotene in 99 samples of propolis from Spain and Chile. A rapid method was developed for quantifying these parameters in raw propolis using near infrared (NIR) spectroscopy with a remote reflectance fibre-optic probe applied directly to the ground-up sample...
July 18, 2017: Sensors
https://www.readbyqxmd.com/read/28718788/implementation-of-an-imu-aided-image-stacking-algorithm-in-a-digital-camera-for-unmanned-aerial-vehicles
#18
Ahmad Audi, Marc Pierrot-Deseilligny, Christophe Meynard, Christian Thom
Images acquired with a long exposure time using a camera embedded on UAVs (Unmanned Aerial Vehicles) exhibit motion blur due to the erratic movements of the UAV. The aim of the present work is to be able to acquire several images with a short exposure time and use an image processing algorithm to produce a stacked image with an equivalent long exposure time. Our method is based on the feature point image registration technique. The algorithm is implemented on the light-weight IGN (Institut national de l'information géographique) camera, which has an IMU (Inertial Measurement Unit) sensor and an SoC (System on Chip)/FPGA (Field-Programmable Gate Array)...
July 18, 2017: Sensors
https://www.readbyqxmd.com/read/28714936/extending-wireless-rechargeable-sensor-network-life-without-full-knowledge
#19
Najeeb W Najeeb, Carrick Detweiler
When extending the life of Wireless Rechargeable Sensor Networks (WRSN), one challenge is charging networks as they grow larger. Overcoming this limitation will render a WRSN more practical and highly adaptable to growth in the real world. Most charging algorithms require a priori full knowledge of sensor nodes' power levels in order to determine the nodes that require charging. In this work, we present a probabilistic algorithm that extends the life of scalable WRSN without a priori power knowledge and without full network exploration...
July 17, 2017: Sensors
https://www.readbyqxmd.com/read/28714927/development-and-application-of-a-structural-health-monitoring-system-based-on-wireless-smart-aggregates
#20
Shi Yan, Haoyan Ma, Peng Li, Gangbing Song, Jianxin Wu
Structural health monitoring (SHM) systems can improve the safety and reliability of structures, reduce maintenance costs, and extend service life. Research on concrete SHMs using piezoelectric-based smart aggregates have reached great achievements. However, the newly developed techniques have not been widely applied in practical engineering, largely due to the wiring problems associated with large-scale structural health monitoring. The cumbersome wiring requires much material and labor work, and more importantly, the associated maintenance work is also very heavy...
July 17, 2017: Sensors
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