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Damian Ortega-Terol, David Hernandez-Lopez, Rocio Ballesteros, Diego Gonzalez-Aguilera
Last advances in sensors, photogrammetry and computer vision have led to high-automation levels of 3D reconstruction processes for generating dense models and multispectral orthoimages from Unmanned Aerial Vehicle (UAV) images. However, these cartographic products are sometimes blurred and degraded due to sun reflection effects which reduce the image contrast and colour fidelity in photogrammetry and the quality of radiometric values in remote sensing applications. This paper proposes an automatic approach for detecting sun reflections problems (hotspot and sun glint) in multispectral images acquired with an Unmanned Aerial Vehicle (UAV), based on a photogrammetric strategy included in a flight planning and control software developed by the authors...
October 15, 2017: Sensors
Chan-Jae Lee, Ji-Young Jung, Jung-Ryun Lee
Recently, the development of wireless body area sensor network (WBASN) has accelerated due to the rapid development of wireless technology. In the WBASN environment, many WBASNs coexist where communication ranges overlap with each other, resulting in the possibility of interference. Although nodes in a WBASN typically operate at a low power level, to avoid adversely affecting the human body, high transmission rates may be required to support some applications. In addition to this, since many varieties of applications exist in the WBASN environment, each prospective user may have different quality of service (QoS) requirements...
October 14, 2017: Sensors
Khalil M Ahmad Yousef, Bassam J Mohd, Khalid Al-Widyan, Thaier Hayajneh
Extrinsic calibration of a camera and a 2D laser range finder (lidar) sensors is crucial in sensor data fusion applications; for example SLAM algorithms used in mobile robot platforms. The fundamental challenge of extrinsic calibration is when the camera-lidar sensors do not overlap or share the same field of view. In this paper we propose a novel and flexible approach for the extrinsic calibration of a camera-lidar system without overlap, which can be used for robotic platform self-calibration. The approach is based on the robot-world hand-eye calibration (RWHE) problem; proven to have efficient and accurate solutions...
October 14, 2017: Sensors
Niuzi Xue, Qinyi Zhang, Shunping Zhang, Pan Zong, Feng Yang
It is important to improve the sensitivities and selectivities of metal oxide semiconductor (MOS) gas sensors when they are used to monitor the state of hydrogen in aerospace industry and electronic field. In this paper, the ordered mesoporous SnO₂ (m-SnO₂) powders were prepared by sol-gel method, and the morphology and structure were characterized by X-ray diffraction analysis (XRD), transmission electron microscope (TEM) and Brunauer-Emmett-Teller (BET). The gas sensors were fabricated using m-SnO₂ as the modified layers on the surface of commercial SnO₂ (c-SnO₂) by screen printing technology, and tested for gas sensing towards ethanol, benzene and hydrogen with operating temperatures ranging from 200 °C to 400 °C...
October 14, 2017: Sensors
Zora S Zunic, Z Stojanovska, N Veselinovic, R Mishra, I V Yarmoshenko, B K Sapra, T Ishikawa, Y Omori, Z Curguz, P Bossew, V Udovicic, R C Ramola
This article deals with the variation of radon (Rn), thoron (Tn) and their progeny concentrations expressed in terms of equilibrium equivalent concentrations (EERC and EETC), in 40 houses, in four villages of Sokobanja municipality, Southern Serbia. Two types of passive detectors were used: (1) discriminative radon-thoron detector for simultaneous Rn and Tn gases measurements and (2) direct Tn and Rn progeny sensors (DRPS/DTPS) for measuring Rn and Tn progeny concentrations. Detectors were exposed simultaneously for a single period of 12 months...
September 19, 2017: Radiation Protection Dosimetry
Justin Ghosh, Mark A McGuire
Aims: Balloon cryoablation is an accepted method of achieving pulmonary vein isolation for the treatment of atrial fibrillation. The relationship between blood flow in the atrium and cryo energy delivery to the tissue remains poorly understood. Methods and results: Controlled cryoablations were performed in vitro using a pulmonary vein phantom constructed from bovine muscle, providing a 20 mm vein ostium. A temperature sensor was mounted within the 'vein wall' at a 1 mm tissue depth...
October 4, 2017: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
Jinmin Yang, Maximilian Buchsteiner, Josef Salvamoser, Josef Irlinger, Qiuju Guo, Jochen Tschiersch
An automatic measuring apparatus called exhalometer for measurement of the radon exhalation rate from soil is introduced. It consists of a pneumatic driven accumulation chamber with an open bottom, a PC-based control system, six Lucas cells for radon measurement and sensors for environmental parameters. It allows moving the accumulation chamber and hereby opening or closing it. The exhalation rate is determined through the increase of radon in the accumulation chamber. For studying exhalation and the affecting factors, the exhalometer was placed at an undisturbed meadow for the entire year of 2015...
September 19, 2017: Radiation Protection Dosimetry
Jiangtao Xu, Huafeng Nie, Kaiming Nie, Weimin Jin
In this paper, an improved moment matching method based on a spatial correlation filter (SCF) and bilateral filter (BF) is proposed to correct the fixed-pattern noise (FPN) of a time-delay-integration CMOS image sensor (TDI-CIS). First, the values of row FPN (RFPN) and column FPN (CFPN) are estimated and added to the original image through SCF and BF, respectively. Then the filtered image will be processed by an improved moment matching method with a moving window. Experimental results based on a 128-stage TDI-CIS show that, after correcting the FPN in the image captured under uniform illumination, the standard deviation of row mean vector (SDRMV) decreases from 5...
September 1, 2017: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
Haris Ahmad Khan, Jean-Baptiste Thomas, Jon Yngve Hardeberg, Olivier Laligant
With the advancement in sensor technology, the use of multispectral imaging is gaining wide popularity for computer vision applications. Multispectral imaging is used to achieve better discrimination between the radiance spectra, as compared to the color images. However, it is still sensitive to illumination changes. This study evaluates the potential evolution of illuminant estimation models from color to multispectral imaging. We first present a state of the art on computational color constancy and then extend a set of algorithms to use them in multispectral imaging...
July 1, 2017: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
Shao-Bing Gao, Ming Zhang, Chao-Yi Li, Yong-Jie Li
It is an ill-posed problem to recover the true scene colors from a color biased image by discounting the effects of scene illuminant and camera spectral sensitivity (CSS) at the same time. Most color constancy (CC) models have been designed to first estimate the illuminant color, which is then removed from the color biased image to obtain an image taken under white light, without the explicit consideration of CSS effect on CC. This paper first studies the CSS effect on illuminant estimation arising in the inter-dataset-based CC (inter-CC), i...
August 1, 2017: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
Jiarui Lin, Kai Gao, Yang Gao, Zheng Wang
In order to detect the position of the cutting shield at the head of a double shield tunnel boring machine (TBM) during the excavation, this paper develops a combined measurement system which is mainly composed of several optical feature points, a monocular vision sensor, a laser target sensor, and a total station. The different elements of the combined system are mounted on the TBM in suitable sequence, and the position of the cutting shield in the reference total station frame is determined by coordinate transformations...
October 1, 2017: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
Jose M Sotoca, Pedro Latorre-Carmona, Filiberto Pla, Xin Shen, Satoru Komatsu, Bahram Javidi
In this work, a 3D reconstruction approach for flexible sensing inspired by integral imaging techniques is proposed. This method allows the application of different integral imaging techniques, such as generating a depth map or the reconstruction of images on a certain 3D plane of the scene that were taken with a set of cameras located at unknown and arbitrary positions and orientations. By means of a photo-consistency measure proposed in this work, all-in-focus images can also be generated by projecting the points of the 3D plane into the sensor planes of the cameras and thereby capturing the associated RGB values...
October 1, 2017: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
Gunnar Treff, Kay Winkert, Katja Machus, Jürgen M Steinacker
PURPOSE: Ramp tests are continuously increasing exercise tests used for determination of maximal oxygen uptake (⩒O2max), which is identifiable by a plateau in ⩒O2despite increasing mechanical power output (LOAD). On wind-braked rowing ergometers (RowErg) it is hardly feasible to ensure a continuous increase in LOAD until test termination, because neither resistance nor stroke-frequency are externally adjustable, but depend on the rower. To enable ramp tests on rowing ergometers, we produced visual stroke-by-stroke feedback showing target and actual LOAD to the rower...
October 16, 2017: International Journal of Sports Physiology and Performance
Ping Lan, F Anthony Romero, Dariusz Wodka, Andrew J Kassick, Qun Dang, Tony Gibson, Dan Cashion, Gaochao Zhou, Yuli Chen, Xiaoping Zhang, Aihua Zhang, Ying Li, Maria E Trujillo, Qing Shao, Margaret Wu, Shiyao Xu, Huaibing He, Deidre MacKenna, Jocelyn Staunton, Kevin T Chapman, Ann Weber, Iyassu K Sebhat, Gergely M Makara
AMP-activated protein kinase (AMPK) plays an essential role as a cellular energy sensor and master regulator of metabolism in eukaryotes. Dysregulated lipid and carbohydrate metabolism resulting from insulin resistance leads to hyperglycemia, the hallmark of type 2 diabetes mellitus (T2DM). While pharmacological activation of AMPK is anticipated to improve these parameters, the discovery of selective, direct activators has proven challenging. We now describe a hit-to-lead effort resulting in the discovery of a potent and selective class of benzimidazole-based direct AMPK activators, exemplified by 5-((5-([1,1'-biphenyl]-4-yl)-6-chloro-1H-benzo[d]imidazol-2-yl)oxy)-2-methylbenzoic acid, 42 (MK-3903)...
October 16, 2017: Journal of Medicinal Chemistry
Shinsuke Ishihara, Jan Labuta, Takashi Nakanishi, Takeshi Tanaka, Hiromichi Kataura
We report amperometric detection of formaldehyde (HCHO) using hydroxylamine hydrochloride and single-walled carbon nanotubes (SWCNTs). Hydroxylamine hydrochloride reacts with HCHO to emit HCl vapor, which injects a hole carrier into semiconducting SWCNTs. The increase of conductivity in SWCNTs is easily monitored using an ohmmeter. The debundling of SWCNTs with a metallo-supramolecular polymer (MSP) increased the active surface area in the SWCNTs network, leading to excellent sensitivity to HCHO with a limit of detection (LoD) of 0...
October 16, 2017: ACS Sensors
Juanjuan Gao, Jingkun Fang, Xuehai Ju, Weiqing Zhu, Xuezhen Lin, Shupeng Zhang, Chuang Ma, Haiou Song
An electrochemically active sensing nanomaterial (denoted as CD-MPEA-NG) has been successfully constructed by an hierarchical self-assembly of cyclodextrin (CD) and N, N-dimethyl-4-(phenylethynyl)aniline (MPEA) on N-doped graphene (NG) in a low-temperature hydrothermal process. The unique nanostructure of the high-performance CD-MPEA-NG was confirmed by utilizing the Fourier transform infrared spectra, an X-ray diffractometer, a differential pulse voltammetry (DPV), etc. In particular, the method of density functional theory with dispersion energy (DFT-D) of wB97XD/LanL2DZ was employed to optimize and describe the face-to-face packing structure of heterodimers of NG and MPEA...
October 16, 2017: ACS Applied Materials & Interfaces
Zohar Pode, Ronny Peri-Naor, Joseph M Georgeson, Tal Ilani, Vladimir Kiss, Tamar Unger, Barak Markus, Haim M Barr, Leila Motiei, David Margulies
Fluorescent molecular probes have become valuable tools in protein research; however, the current methods for using these probes are less suitable for analysing specific populations of proteins in their native environment. In this study, we address this gap by developing a unimolecular fluorescent probe that combines the properties of small-molecule-based probes and cross-reactive sensor arrays (the so-called chemical 'noses/tongues'). On the one hand, the probe can detect different proteins by generating unique identification (ID) patterns, akin to cross-reactive arrays...
October 16, 2017: Nature Nanotechnology
Lluís Casals, Bernat Mir, Rafael Vidal, Carles Gomez
LoRaWAN is a flagship Low-Power Wide Area Network (LPWAN) technology that has highly attracted much attention from the community in recent years. Many LoRaWAN end-devices, such as sensors or actuators, are expected not to be powered by the electricity grid; therefore, it is crucial to investigate the energy consumption of LoRaWAN. However, published works have only focused on this topic to a limited extent. In this paper, we present analytical models that allow the characterization of LoRaWAN end-device current consumption, lifetime and energy cost of data delivery...
October 16, 2017: Sensors
Wenming Tang, Guixiong Liu, Yuzhong Li, Daji Tan
High data transmission efficiency is a key requirement for an ultrasonic phased array with multi-group ultrasonic sensors. Here, a novel FIFOs scheduling algorithm was proposed and the data transmission efficiency with hardware technology was improved. This algorithm includes FIFOs as caches for the ultrasonic scanning data obtained from the sensors with the output data in a bandwidth-sharing way, on the basis of which an optimal length ratio of all the FIFOs is achieved, allowing the reading operations to be switched among all the FIFOs without time slot waiting...
October 16, 2017: Sensors
Chi Lok Wong, Marissa Chua, Heather Mittman, Li Xian Choo, Hann Qian Lim, Malini Olivo
In this paper, we present a phase-intensity surface plasmon resonance (SPR) biosensor and demonstrate its use for avian influenza A (H5N1) antibody biomarker detection. The sensor probes the intensity variation produced by the steep phase response at surface plasmon excitation. The prism sensor head is fixed between a pair of polarizers with a perpendicular orientation angle and a forbidden transmission path. At SPR, a steep phase change is introduced between the p- and s-polarized light, and this rotates the polarization ellipse of the transmission beam...
October 16, 2017: Sensors
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