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https://www.readbyqxmd.com/read/29160797/target-tracking-with-sensor-navigation-using-coupled-rss-and-aoa-measurements
#1
Slavisa Tomic, Marko Beko, Rui Dinis, João Pedro Gomes
This work addresses the problem of tracking a signal-emitting mobile target in wireless sensor networks (WSNs) with navigated mobile sensors. The sensors are properly equipped to acquire received signal strength (RSS) and angle of arrival (AoA) measurements from the received signal, while the target transmit power is assumed not known. We start by showing how to linearize the highly non-linear measurement model. Then, by employing a Bayesian approach, we combine the linearized observation model with prior knowledge extracted from the state transition model...
November 21, 2017: Sensors
https://www.readbyqxmd.com/read/29156581/an-enhanced-non-coherent-pre-filter-design-for-tracking-error-estimation-in-gnss-receivers
#2
Zhibin Luo, Jicheng Ding, Lin Zhao, Mouyan Wu
Tracking error estimation is of great importance in global navigation satellite system (GNSS) receivers. Any inaccurate estimation for tracking error will decrease the signal tracking ability of signal tracking loops and the accuracies of position fixing, velocity determination, and timing. Tracking error estimation can be done by traditional discriminator, or Kalman filter-based pre-filter. The pre-filter can be divided into two categories: coherent and non-coherent. This paper focuses on the performance improvements of non-coherent pre-filter...
November 18, 2017: Sensors
https://www.readbyqxmd.com/read/29149088/model-based-heterogeneous-data-fusion-for-reliable-force-estimation-in-dynamic-structures-under-uncertainties
#3
Babak Khodabandeloo, Dyan Melvin, Hongki Jo
Direct measurements of external forces acting on a structure are infeasible in many cases. The Augmented Kalman Filter (AKF) has several attractive features that can be utilized to solve the inverse problem of identifying applied forces, as it requires the dynamic model and the measured responses of structure at only a few locations. But, the AKF intrinsically suffers from numerical instabilities when accelerations, which are the most common response measurements in structural dynamics, are the only measured responses...
November 17, 2017: Sensors
https://www.readbyqxmd.com/read/29134299/fecal-transplantation-for-treatment-of-clostridium-difficile-infection-in-elderly-and-debilitated-patients
#4
Tali Friedman-Korn, Dan Meir Livovsky, Nitsan Maharshak, Nathaniel Aviv Cohen, Kalman Paz, Ariella Bar-Gil Shitrit, Eran Goldin, Benjamin Koslowsky
BACKGROUND: Fecal microbiota transplantation (FMT) is a new technique recently introduced to treat recurrent Clostridium difficile infection (CDI). Little is known about the efficacy and risks of FMT in elderly and ill patients. AIM: To investigate FMT efficacy in ill and elderly patients compared to conventional treatment. METHODS: The study comprised two groups of patients between 2012 and 2016 with recurrent CDI at two medical centers in Israel...
November 13, 2017: Digestive Diseases and Sciences
https://www.readbyqxmd.com/read/29133174/abca1-rs2230805-and-rs2230806-common-gene-variants-are-associated-with-alzheimer-s-disease
#5
Ágnes Fehér, Zsófia Giricz, Anna Juhász, Magdolna Pákáski, Zoltán Janka, János Kálmán
The ATP-binding cassette, sub-family A, member 1 gene (ABCA1) is a relevant positional and functional candidate gene for Alzheimer's disease (AD). A case-control association study of genetic variations covering the ABCA1 locus was performed in relation to AD risk in a Hungarian sample. Five single nucleotide polymorphisms (rs2422493: C-477T, rs2740483: G-17C, rs2230805: G474A/L158L, rs2230806: G656A/R219K and rs2066718: G2311A/V771M) were genotyped in 431 AD patients and 302 cognitively healthy, elderly controls...
November 10, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/29130693/putting-bandits-into-context-how-function-learning-supports-decision-making
#6
Eric Schulz, Emmanouil Konstantinidis, Maarten Speekenbrink
The authors introduce the contextual multi-armed bandit task as a framework to investigate learning and decision making in uncertain environments. In this novel paradigm, participants repeatedly choose between multiple options in order to maximize their rewards. The options are described by a number of contextual features which are predictive of the rewards through initially unknown functions. From their experience with choosing options and observing the consequences of their decisions, participants can learn about the functional relation between contexts and rewards and improve their decision strategy over time...
November 13, 2017: Journal of Experimental Psychology. Learning, Memory, and Cognition
https://www.readbyqxmd.com/read/29130452/augmenting-intracortical-brain-machine-interface-with-neurally-driven-error-detectors
#7
Nir Even-Chen, Sergey D Stavisky, Jonathan C Kao, Stephen I Ryu, Krishna V Shenoy
OBJECTIVE: Making mistakes is inevitable, but identifying them allows us to correct or adapt our behavior to improve future performance. Current brain-machine interfaces (BMIs) make errors that need to be explicitly corrected by the user, thereby consuming time and thus hindering performance. We hypothesized that neural correlates of the user perceiving the mistake could be used by the BMI to automatically correct errors. However, it was unknown whether intracortical outcome error signals were present in the premotor and primary motor cortices, brain regions successfully used for intracortical BMIs...
November 13, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/29130067/gaussian-process-regression-for-sensorless-grip-force-estimation-of-cable-driven-elongated-surgical-instruments
#8
Yangming Li, Blake Hannaford
Haptic feedback is a critical but a clinically missing component in robotic Minimally Invasive Surgeries. This paper proposes a Gaussian Process Regression(GPR) based scheme to address the gripping force estimation problem for clinically commonly used elongated cable-driven surgical instruments. Based on the cable-driven mechanism property studies and surgical robotic system properties, four different Gaussian Process Regression filters were designed and analyzed, including: one GPR filter with 2-dimensional inputs, one GPR filter with 3-dimensional inputs, one GPR Unscented Kalman Filter (UKF) with 2-dimensional inputs, and one GPR UKF with 3-dimensional inputs...
July 2017: IEEE Robotics and Automation Letters
https://www.readbyqxmd.com/read/29118202/bayesian-optimal-adaptation-explains-age-related-human-sensorimotor-changes
#9
Faisal Karmali, Gregory T Whitman, Richard F Lewis
The brain uses information from different sensory systems to guide motor behavior, and aging is associated with a simultaneous decline in the quality of sensory information provided to the brain and a deterioration in motor control. Correlations between age-dependent decline in sensory anatomical structures and behavior have been demonstrated, and it has recently been suggested that a Bayesian framework could explain these relationships. Here we show that age-dependent changes in a human sensorimotor reflex, the vestibulo-ocular reflex, are explained by a Bayesian optimal adaptation in the brain occurring in response to death of motion-sensing hair cells...
November 8, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/29115951/letter-to-the-editor-round-table-unites-to-tackle-culture-change-in-an-effort-to-improve-animal-research-reporting
#10
EDITORIAL
Nicola J Osborne, Merel Ritskes-Hoitinga, Amrita Ahluwahlia, Sabina Alam, Matthew Brown, Hayley Henderson, Wim de Leeuw, Joan Marsh, David Moher, Erica van Oort, Frances Rawle, Beat M Riederer, Jose Sanchez-Morgado, Emily S Sena, Caroline Struthers, Matthew Westmore, Marc T Avey, Rony Kalman, Annette O'Connor, Jan Sargeant, Anja Petrie, Adrian Smith
A round table discussion was held during the LAVA-ESLAV-ECLAM conference on Reproducibility of Animal Studies on the 25th of September 2017 in Edinburgh. The aim of the round table was to discuss how to enhance the rate at which the quality of reporting animal research can be improved. This signed statement acknowledges the efforts that participant organizations have made towards improving the reporting of animal studies and confirms an ongoing commitment to drive further improvements, calling upon both academics and laboratory animal veterinarians to help make this cultural change...
November 7, 2017: BMC Veterinary Research
https://www.readbyqxmd.com/read/29113812/differential-associations-of-lower-cardiac-vagal-tone-with-insulin-resistance-and-insulin-secretion-in-recently-diagnosed-type-1-and-type-2-diabetes
#11
Dan Ziegler, Alexander Strom, Gidon Bönhof, Sonja Püttgen, Kálmán Bódis, Volker Burkart, Karsten Müssig, Julia Szendroedi, Daniel F Markgraf, Michael Roden
OBJECTIVE: It is unclear to which extent altered insulin sensitivity/secretion contribute to the development of diabetic cardiovascular autonomic neuropathy (CAN) characterized by diminished heart rate variability (HRV). We hypothesised that lower HRV is differentially associated with measures of insulin resistance and insulin secretion in recent-onset type 1 and type 2 diabetes. MATERIALS/METHODS: This cross-sectional study included participants from the German Diabetes Study with type 1 (n=275) or type 2 diabetes (n=450) with known diabetes duration ≤1 year and glucose-tolerant controls (n=81)...
November 4, 2017: Metabolism: Clinical and Experimental
https://www.readbyqxmd.com/read/29113085/centralized-multi-sensor-square-root-cubature-joint-probabilistic-data-association
#12
Yu Liu, Jun Liu, Gang Li, Lin Qi, Yaowen Li, You He
This paper focuses on the tracking problem of multiple targets with multiple sensors in a nonlinear cluttered environment. To avoid Jacobian matrix computation and scaling parameter adjustment, improve numerical stability, and acquire more accurate estimated results for centralized nonlinear tracking, a novel centralized multi-sensor square root cubature joint probabilistic data association algorithm (CMSCJPDA) is proposed. Firstly, the multi-sensor tracking problem is decomposed into several single-sensor multi-target tracking problems, which are sequentially processed during the estimation...
November 5, 2017: Sensors
https://www.readbyqxmd.com/read/29109832/cardioprotective-effect-of-resveratrol-in-a-postinfarction-heart-failure-model
#13
Adam Riba, Laszlo Deres, Balazs Sumegi, Kalman Toth, Eszter Szabados, Robert Halmosi
Despite great advances in therapies observed during the last decades, heart failure (HF) remained a major health problem in western countries. In order to further improve symptoms and survival in patients with heart failure, novel therapeutic strategies are needed. In some animal models of HF resveratrol (RES), it was able to prevent cardiac hypertrophy, contractile dysfunction, and remodeling. Several molecular mechanisms are thought to be involved in its protective effects, such as inhibition of prohypertrophic signaling molecules, improvement of myocardial Ca(2+) handling, regulation of autophagy, and the reduction of oxidative stress and inflammation...
2017: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/29106034/evaluation-of-central-venous-catheters-coated-with-a-noble-metal-alloy-a-randomized-clinical-pilot-study-of-coating-durability-performance-and-tolerability
#14
Gunilla Björling, Dorota Johansson, Linda Bergström, Anton Strekalovsky, Javier Sanchez, Claes Frostell, Sigridur Kalman
The use of Central Venous Catheters (CVCs) commonly results in complications. Coatings with silver or metal alloys can reduce the risk associated with the use of CVC. We have evaluated the durability of a noble metal coated CVC (the Bactiguard Infectious Protection, BIP CVC) and compared with an uncoated CVC for clinical tolerability (Adverse Events, AEs) and performance, in order to create a baseline for a large future study. Patients undergoing major surgery, randomised at a 2:1 ratio to BIP CVC (n = 22) or standard CVC (n = 12), were catheterized 9 - 12 days, respectively...
November 6, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/29099845/real-time-endoscopic-image-orientation-correction-system-using-an-accelerometer-and-gyrosensor
#15
Hyung-Chul Lee, Chul-Woo Jung, Hee Chan Kim
The discrepancy between spatial orientations of an endoscopic image and a physician's working environment can make it difficult to interpret endoscopic images. In this study, we developed and evaluated a device that corrects the endoscopic image orientation using an accelerometer and gyrosensor. The acceleration of gravity and angular velocity were retrieved from the accelerometer and gyrosensor attached to the handle of the endoscope. The rotational angle of the endoscope handle was calculated using a Kalman filter with transmission delay compensation...
2017: PloS One
https://www.readbyqxmd.com/read/29099751/correction-a-new-quaternion-based-kalman-filter-for-real-time-attitude-estimation-using-the-two-step-geometrically-intuitive-correction-algorithm-sensors-2017-17-2146
#16
Kaiqiang Feng, Jie Li, Xiaoming Zhang, Chong Shen, Yu Bi, Tao Zheng, Jun Liu
The authors wish to make the following corrections to their paper [...].
November 3, 2017: Sensors
https://www.readbyqxmd.com/read/29092202/simpplified-extended-kalman-filter-phase-noise-estimation-for-co-ofdm-transmissions
#17
Tu T Nguyen, Son T Le, Marc Wuilpart, Tatiana Yakusheva, Patrice Mégret
We propose a flexible simplified extended Kalman filter (S-EKF) scheme that can be applied in both pilot-aided and blind modes for phase noise compensation in 16-QAM CO-OFDM transmission systems employing a small-to-moderate number of subcarriers. The performance of the proposed algorithm is evaluated and compared with conventional pilot-aided (PA) and blind phase search (BPS) methods via extensive an Monte Carlo simulation in a back-to-back configuration and with a dual polarization fiber transmission. For 64 subcarrier 32 Gbaud 16-QAM CO-OFDM systems with 200 kHz combined laser linewidths, an optical signal-to-noise ratio penalty as low as 1 dB can be achieved with the proposed S-EKF scheme using only 2 pilots in the pilot-aided mode and just 4 inputs in the blind mode, resulting in a spectrally efficient enhancement by a factor of 3 and a computational effort reduction by a factor of more than 50 in comparison with the conventional PA and the BPS methods, respectively...
October 30, 2017: Optics Express
https://www.readbyqxmd.com/read/29092174/portable-broadband-cavity-enhanced-spectrometer-utilizing-kalman-filtering-application-to-real-time-in-situ-monitoring-of-glyoxal-and-nitrogen-dioxide
#18
Bo Fang, Weixiong Zhao, Xuezhe Xu, Jiacheng Zhou, Xiao Ma, Shuo Wang, Weijun Zhang, Dean S Venables, Weidong Chen
This article describes the development and field application of a portable broadband cavity enhanced spectrometer (BBCES) operating in the spectral range of 440-480 nm for sensitive, real-time, in situ measurement of ambient glyoxal (CHOCHO) and nitrogen dioxide (NO2). The instrument utilized a custom cage system in which the same SMA collimators were used in the transmitter and receiver units for coupling the LED light into the cavity and collecting the light transmitted through the cavity. This configuration realised a compact and stable optical system that could be easily aligned...
October 30, 2017: Optics Express
https://www.readbyqxmd.com/read/29080564/use-of-multiple-data-assimilation-techniques-in-groundwater-contaminant-transport-modeling
#19
Amirul Islam Rajib, Godwin Appiah Assumaning, Shoou-Yuh Chang, Elvis Boamah Addai
  Groundwater contamination assessment can be useful in taking proper actions during environmental emergency. A three-dimensional deterministic model was taken into consideration to simulate the advective-diffusive transport of non-conservative contaminant in groundwater. Multiple stochastic data assimilation techniques, such as, ensemble Kalman filter (EnKF), local ensemble transform Kalman filter (LETKF), and the global form of the LETKF, denoted as GETKF were applied to the model. The results show that data assimilation improved contaminant concentration prediction...
November 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29079777/pharmacological-preconditioning-with-gemfibrozil-preserves-cardiac-function-after-heart-transplantation
#20
Kálmán Benke, Csaba Mátyás, Alex Ali Sayour, Attila Oláh, Balázs Tamás Németh, Mihály Ruppert, Gábor Szabó, Gábor Kökény, Eszter Mária Horváth, István Hartyánszky, Zoltán Szabolcs, Béla Merkely, Tamás Radovits
While heart transplantation (HTX) is the definitive therapy of heart failure, donor shortage is emerging. Pharmacological activation of soluble guanylate cyclase (sGC) and increased cGMP-signalling have been reported to have cardioprotective properties. Gemfibrozil has recently been shown to exert sGC activating effects in vitro. We aimed to investigate whether pharmacological preconditioning of donor hearts with gemfibrozil could protect against ischemia/reperfusion injury and preserve myocardial function in a heterotopic rat HTX model...
October 27, 2017: Scientific Reports
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