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https://www.readbyqxmd.com/read/27918454/coordinate-based-clustering-method-for-indoor-fingerprinting-localization-in-dense-cluttered-environments
#1
Wen Liu, Xiao Fu, Zhongliang Deng
Indoor positioning technologies has boomed recently because of the growing commercial interest in indoor location-based service (ILBS). Due to the absence of satellite signal in Global Navigation Satellite System (GNSS), various technologies have been proposed for indoor applications. Among them, Wi-Fi fingerprinting has been attracting much interest from researchers because of its pervasive deployment, flexibility and robustness to dense cluttered indoor environments. One challenge, however, is the deployment of Access Points (AP), which would bring a significant influence on the system positioning accuracy...
December 2, 2016: Sensors
https://www.readbyqxmd.com/read/27914429/big-brown-bats-eptesicus-fuscus-reveal-diverse-strategies-for-sonar-target-tracking-in-clutter
#2
Beatrice Mao, Murat Aytekin, Gerald S Wilkinson, Cynthia F Moss
Bats actively adjust the acoustic features of their sonar calls to control echo information specific to a given task and environment. A previous study investigated how bats adapted their echolocation behavior when tracking a moving target in the presence of a stationary distracter at different distances and angular offsets. The use of only one distracter, however, left open the possibility that a bat could reduce the interference of the distracter by turning its head. Here, bats tracked a moving target in the presence of one or two symmetrically placed distracters to investigate adaptive echolocation behavior in a situation where vocalizing off-axis would result in increased interference from distracter echoes...
September 2016: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/27913342/efficient-strategies-for-estimating-the-spatial-coherence-of-backscatter
#3
Dongwoon Hyun, Anna Lisa C Crowley, Jeremy J Dahl
The spatial coherence of ultrasound backscatter has been proposed to reduce clutter in medical imaging, to measure the anisotropy of the scattering source, and to improve the detection of blood flow. These techniques rely on correlation estimates that are obtained using computationally expensive strategies. In this study, we assess existing spatial coherence estimation methods and propose three computationally efficient modifications: a reduced kernel, a downsampled receive aperture, and the use of an ensemble correlation coefficient...
December 1, 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/27911380/method-for-identifying-small-molecule-inhibitors-of-the-protein-protein-interaction-between-hcn1-and-trip8b
#4
Ye Han, Kyle A Lyman, Matt Clutter, Gary E Schiltz, Quratul-Ain Ismail, Xiangying Cheng, Chi-Hao Luan, Dane M Chetkovich
Hyperpolarization-activated cyclic nucleotide-gated (HCN) channels are expressed ubiquitously throughout the brain, where they function to regulate the excitability of neurons. The subcellular distribution of these channels in pyramidal neurons of hippocampal area CA1 is regulated by tetratricopeptide repeat-containing Rab8b interacting protein (TRIP8b), an auxiliary subunit. Genetic knockout of HCN pore forming subunits or TRIP8b, both lead to an increase in antidepressant-like behavior, suggesting that limiting the function of HCN channels may be useful as a treatment for Major Depressive Disorder (MDD)...
November 11, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27909061/understanding-socioenvironmental-contributors-to-racial-and-ethnic-disparities-in-disability-among-older-americans
#5
Allison B Brenner, Philippa J Clarke
Our understanding of the mechanisms through which racial/ethnic disparities in disability in older adults develop and are maintained is limited. We examined the role of physical impairment, socioeconomic factors and health for racial/ethnic disparities in activities of daily living (ADL), and the modifying role of the indoor home environment. Data come from the National Health and Aging Trends Study (N = 5,640), and negative binomial regression models were specified separately for men and women. Blacks and Hispanics reported more ADL difficulty than Whites...
November 30, 2016: Research on Aging
https://www.readbyqxmd.com/read/27897197/on-site-rapid-diagnosis-of-intracranial-hematoma-using-portable-multi-slice-microwave-imaging-system
#6
Ahmed Toaha Mobashsher, A M Abbosh
Rapid, on-the-spot diagnostic and monitoring systems are vital for the survival of patients with intracranial hematoma, as their conditions drastically deteriorate with time. To address the limited accessibility, high costs and static structure of currently used MRI and CT scanners, a portable non-invasive multi-slice microwave imaging system is presented for accurate 3D localization of hematoma inside human head. This diagnostic system provides fast data acquisition and imaging compared to the existing systems by means of a compact array of low-profile, unidirectional antennas with wideband operation...
November 29, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27893390/unsupervised-multi-class-co-segmentation-via-joint-cut-over-l1-manifold-hyper-graph-of-discriminative-image-regions
#7
Jizhou Ma, Shuai Li, Hong Qin, Aimin Hao
This paper systematically advocates a robust and efficient unsupervised multi-class co-segmentation approach by leveraging underlying subspace manifold propagation to exploit the cross-image coherency. It can combat certain image cosegmentation difficulties due to viewpoint change, partial occlusion, complex background, transient illumination, and cluttering texture patterns. Our key idea is to construct a powerful hyper-graph joint-cut framework, which incorporates mid-level image regions based intra-image feature representation and L1- manifold graph based inter-image coherency exploration...
November 22, 2016: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/27886106/multi-target-tracking-using-an-improved-gaussian-mixture-cphd-filter
#8
Weijian Si, Liwei Wang, Zhiyu Qu
The cardinalized probability hypothesis density (CPHD) filter is an alternative approximation to the full multi-target Bayesian filter for tracking multiple targets. However, although the joint propagation of the posterior intensity and cardinality distribution in its recursion allows more reliable estimates of the target number than the PHD filter, the CPHD filter suffers from the spooky effect where there exists arbitrary PHD mass shifting in the presence of missed detections. To address this issue in the Gaussian mixture (GM) implementation of the CPHD filter, this paper presents an improved GM-CPHD filter, which incorporates a weight redistribution scheme into the filtering process to modify the updated weights of the Gaussian components when missed detections occur...
November 23, 2016: Sensors
https://www.readbyqxmd.com/read/27875212/hairy-slices-evaluating-the-perceptual-effectiveness-of-cutting-plane-glyphs-for-3d-vector-fields
#9
Andrew H Stevens, Thomas Butkiewicz, Colin Ware
Three-dimensional vector fields are common datasets throughout the sciences. Visualizing these fields is inherently difficult due to issues such as visual clutter and self-occlusion. Cutting planes are often used to overcome these issues by presenting more manageable slices of data. The existing literature provides many techniques for visualizing the flow through these cutting planes; however, there is a lack of empirical studies focused on the underlying perceptual cues that make popular techniques successful...
January 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/27875209/jacobi-fiber-surfaces-for-bivariate-reeb-space-computation
#10
Julien Tierny, Hamish Carr
This paper presents an efficient algorithm for the computation of the Reeb space of an input bivariate piecewise linear scalar function f defined on a tetrahedral mesh. By extending and generalizing algorithmic concepts from the univariate case to the bivariate one, we report the first practical, output-sensitive algorithm for the exact computation of such a Reeb space. The algorithm starts by identifying the Jacobi set of f, the bivariate analogs of critical points in the univariate case. Next, the Reeb space is computed by segmenting the input mesh along the new notion of Jacobi Fiber Surfaces, the bivariate analog of critical contours in the univariate case...
January 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/27875203/glyphlens-view-dependent-occlusion-management-in-the-interactive-glyph-visualization
#11
Xin Tong, Cheng Li, Han-Wei Shen
Glyph as a powerful multivariate visualization technique is used to visualize data through its visual channels. To visualize 3D volumetric dataset, glyphs are usually placed on 2D surface, such as the slicing plane or the feature surface, to avoid occluding each other. However, the 3D spatial structure of some features may be missing. On the other hand, placing large number of glyphs over the entire 3D space results in occlusion and visual clutter that make the visualization ineffective. To avoid the occlusion, we propose a view-dependent interactive 3D lens that removes the occluding glyphs by pulling the glyphs aside through the animation...
January 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/27875178/optimizing-hierarchical-visualizations-with-the-minimum-description-length-principle
#12
Rafael Veras, Christopher Collins
In this paper we examine how the Minimum Description Length (MDL) principle can be used to efficiently select aggregated views of hierarchical datasets that feature a good balance between clutter and information. We present MDL formulae for generating uneven tree cuts tailored to treemap and sunburst diagrams, taking into account the available display space and information content of the data. We present the results of a proof-of-concept implementation. In addition, we demonstrate how such tree cuts can be used to enhance drill-down interaction in hierarchical visualizations by implementing our approach in an existing visualization tool...
January 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/27875170/towards-unambiguous-edge-bundling-investigating-confluent-drawings-for-network-visualization
#13
Benjamin Bach, Nathalie Henry Riche, Christophe Hurter, Kim Marriott, Tim Dwyer
In this paper, we investigate Confluent Drawings (CD), a technique for bundling edges in node-link diagrams based on network connectivity. Edge-bundling techniques are designed to reduce edge clutter in node-link diagrams by coalescing lines into common paths or bundles. Unfortunately, traditional bundling techniques introduce ambiguity since edges are only bundled by spatial proximity, rather than network connectivity; following an edge from its source to its target can lead to the perception of incorrect connectivity if edges are not clearly separated within the bundles...
January 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/27875157/many-to-many-geographically-embedded-flow-visualisation-an-evaluation
#14
Yalong Yang, Tim Dwyer, Sarah Goodwin, Kim Marriott
Showing flows of people and resources between multiple geographic locations is a challenging visualisation problem. We conducted two quantitative user studies to evaluate different visual representations for such dense many-to-many flows. In our first study we compared a bundled node-link flow map representation and OD Maps [37] with a new visualisation we call MapTrix. Like OD Maps, MapTrix overcomes the clutter associated with a traditional flow map while providing geographic embedding that is missing in standard OD matrix representations...
January 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/27872373/real-world-visual-statistics-and-infants-first-learned-object-names
#15
Elizabeth M Clerkin, Elizabeth Hart, James M Rehg, Chen Yu, Linda B Smith
We offer a new solution to the unsolved problem of how infants break into word learning based on the visual statistics of everyday infant-perspective scenes. Images from head camera video captured by 8 1/2 to 10 1/2 month-old infants at 147 at-home mealtime events were analysed for the objects in view. The images were found to be highly cluttered with many different objects in view. However, the frequency distribution of object categories was extremely right skewed such that a very small set of objects was pervasively present-a fact that may substantially reduce the problem of referential ambiguity...
January 5, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/27867942/quantification-of-calcified-particles-in-human-valve-tissue-reveals-asymmetry-of-calcific-aortic-valve-disease-development
#16
Katsumi Yabusaki, Joshua D Hutcheson, Payal Vyas, Sergio Bertazzo, Simon C Body, Masanori Aikawa, Elena Aikawa
Recent studies indicated that small calcified particles observable by scanning electron microscopy (SEM) may initiate calcification in cardiovascular tissues. We hypothesized that if the calcified particles precede gross calcification observed in calcific aortic valve disease (CAVD), they would exhibit a regional asymmetric distribution associated with CAVD development, which always initiates at the base of aortic valve leaflets adjacent to the aortic outflow in a region known as the fibrosa. Testing this hypothesis required counting the calcified particles in histological sections of aortic valve leaflets...
2016: Frontiers in Cardiovascular Medicine
https://www.readbyqxmd.com/read/27867762/a-global-analysis-of-bird-plumage-patterns-reveals-no-association-between-habitat-and-camouflage
#17
Marius Somveille, Kate L A Marshall, Thanh-Lan Gluckman
Evidence suggests that animal patterns (motifs) function in camouflage. Irregular mottled patterns can facilitate concealment when stationary in cluttered habitats, whereas regular patterns typically prevent capture during movement in open habitats. Bird plumage patterns have predominantly converged on just four types-mottled (irregular), scales, bars and spots (regular)-and habitat could be driving convergent evolution in avian patterning. Based on sensory ecology, we therefore predict that irregular patterns would be associated with visually noisy closed habitats and that regular patterns would be associated with open habitats...
2016: PeerJ
https://www.readbyqxmd.com/read/27867418/crf-based-model-for-instrument-detection-and-pose-estimation-in-retinal-microsurgery
#18
Mohamed Alsheakhali, Abouzar Eslami, Hessam Roodaki, Nassir Navab
Detection of instrument tip in retinal microsurgery videos is extremely challenging due to rapid motion, illumination changes, the cluttered background, and the deformable shape of the instrument. For the same reason, frequent failures in tracking add the overhead of reinitialization of the tracking. In this work, a new method is proposed to localize not only the instrument center point but also its tips and orientation without the need of manual reinitialization. Our approach models the instrument as a Conditional Random Field (CRF) where each part of the instrument is detected separately...
2016: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/27867195/order-from-clutter-selective-interactions-at-mammalian-replication-origins
#19
Mirit I Aladjem, Christophe E Redon
Mammalian chromosome duplication progresses in a precise order and is subject to constraints that are often relaxed in developmental disorders and malignancies. Molecular information about the regulation of DNA replication at the chromatin level is lacking because protein complexes that initiate replication seem to bind chromatin indiscriminately. High-throughput sequencing and mathematical modelling have yielded detailed genome-wide replication initiation maps. Combining these maps and models with functional genetic analyses suggests that distinct DNA-protein interactions at subgroups of replication initiation sites (replication origins) modulate the ubiquitous replication machinery and supports an emerging model that delineates how indiscriminate DNA-binding patterns translate into a consistent, organized replication programme...
November 21, 2016: Nature Reviews. Genetics
https://www.readbyqxmd.com/read/27855683/validation-of-the-clutter-image-rating-cir-scale-among-psychiatric-outpatients-in-singapore
#20
Vathsala Sagayadevan, Ying Wen Lau, Clarissa Ong, Siau Pheng Lee, Siow Ann Chong, Mythily Subramaniam
BACKGROUND: The Clutter Image Rating (CIR) Scale though extensively used to assess hoarding behavior, has mainly been validated in Western populations. METHODS: The current study sought to validate the CIR in a sample of psychiatric outpatients (nā€‰=ā€‰500) in Singapore. Convergent and divergent validity as well as inter-observer reliabilities between participant CIR and interviewer-rated CIR were calculated. RESULTS: The CIR performed fairly in identifying participants with and without hoarding problems according to the Savings Inventory Revised (SI-R)...
November 17, 2016: BMC Psychiatry
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