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Signal detection theory

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https://www.readbyqxmd.com/read/28505085/sparsity-adaptive-matching-pursuit-detection-algorithm-based-on-compressed-sensing-for-radar-signals
#1
Yanbo Wei, Zhizhong Lu, Gannan Yuan, Zhao Fang, Yu Huang
In this paper, the application of the emerging compressed sensing (CS) theory and the geometric characteristics of the targets in radar images are investigated. Currently, the signal detection algorithms based on the CS theory require knowing the prior knowledge of the sparsity of target signals. However, in practice, it is often impossible to know the sparsity in advance. To solve this problem, a novel sparsity adaptive matching pursuit (SAMP) detection algorithm is proposed. This algorithm executes the detection task by updating the support set and gradually increasing the sparsity to approximate the original signal...
May 13, 2017: Sensors
https://www.readbyqxmd.com/read/28490500/the-wisdom-of-crowds-for-visual-search
#2
Mordechai Z Juni, Miguel P Eckstein
Decision-making accuracy typically increases through collective integration of people's judgments into group decisions, a phenomenon known as the wisdom of crowds. For simple perceptual laboratory tasks, classic signal detection theory specifies the upper limit for collective integration benefits obtained by weighted averaging of people's confidences, and simple majority voting can often approximate that limit. Life-critical perceptual decisions often involve searching large image data (e.g., medical, security, and aerial imagery), but the expected benefits and merits of using different pooling algorithms are unknown for such tasks...
May 10, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28484763/electron-stimulated-desorption-from-condensed-pyrimidine-and-pyridazine
#3
L Ellis-Gibbings, A D Bass, P Cloutier, G García, L Sanche
Low energy electron (LEE) interactions and the formation of transient negative ions play a dominant role in radiation-induced dissociation of condensed-phase biomolecules (e.g. in radiotherapy). Here we present data on the LEE-induced dissociation and desorption of the DNA/RNA-base and radiosensitizing agent analogues pyrimidine and pyridazine. Vapors of each molecule were condensed on either a Pt or Ar substrate to form a multilayer film or a submonolayer molecular target, respectively. These were irradiated with electrons of 0-80 eV and the desorbing anionic and cationic fragments analysed via time of flight mass spectrometry...
May 9, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28484416/neuromyths-in-music-education-prevalence-and-predictors-of-misconceptions-among-teachers-and-students
#4
Nina Düvel, Anna Wolf, Reinhard Kopiez
In the last decade, educational neuroscience has become increasingly important in the context of instruction, and its applications have been transformed into new teaching methods. Although teachers are interested in educational neuroscience, communication between scientists and teachers is not always straightforward. Thus, misunderstandings of neuroscientific research results can evolve into so-called neuromyths. The aim of the present study was to investigate the prevalence of such music-related neuromyths among music teachers and music students...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28481593/john-a-swets-1928-2016
#5
Raymond S Nickerson
This article memorializes John A. Swets (1928 -2016). Swets's scientific work included empirical experimentation, theory development, and practical applications. It attracted much attention, not only in psychology, but in other fields as well, especially medicine, education, and engineering. His work on the application of the theory of signal detection-which he began while still a graduate student- is very well known and has been influential in essentially every context in which people have to deal with noisy data...
May 2017: American Psychologist
https://www.readbyqxmd.com/read/28474181/sexual-selection-on-receptor-organ-traits-younger-females-attract-males-with-longer-antennae
#6
Tamara L Johnson, Matthew R E Symonds, Mark A Elgar
Sexual selection theory predicts that female choice may favour the evolution of elaborate male signals. Darwin also suggested that sexual selection can favour elaborate receiver structures in order to better detect sexual signals, an idea that has been largely ignored. We evaluated this unorthodox perspective by documenting the antennal lengths of male Uraba lugens Walker (Lepidoptera: Nolidae) moths that were attracted to experimentally manipulated emissions of female sex pheromone. Either one or two females were placed in field traps for the duration of their adult lives in order to create differences in the quantity of pheromone emissions from the traps...
June 2017: Die Naturwissenschaften
https://www.readbyqxmd.com/read/28465264/quantitative-susceptibility-mapping-as-a-possible-tool-to-radiographically-diagnose-sentinel-headache-associated-with-intracranial-aneurysm-case-report
#7
Daichi Nakagawa, Cameron Cushing, Yasunori Nagahama, Lauren Allan, David Hasan
BACKGROUND: Sentinel headache (SH) is estimated to occur prior to rupture of an aneurysm in 15-60% of aneurysmal subarachnoid hemorrhage (aSAH) cases. Non-contrasted computed tomography (CT) of brain and lumbar puncture are both negative, by definition, in patients presenting with SH. One of the theories explaining this phenomenon is micro-hemorrhage (MH) from the aneurysm wall contributing to iron deposition in the interface between the aneurysm wall and brain parenchyma. Quantitative susceptibility mapping (QSM) is a recently introduced magnetic resonance imaging (MRI) technique that has been shown capable of localizing the deposition of paramagnetic metals, particularly ferric iron...
April 29, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28464666/a-theoretical-and-numerical-study-on-the-mechanics-of-vibro-acoustic-modulation
#8
Ashish Kumar Singh, Boyang Chen, Vincent B C Tan, Tong Earn Tay, Heow Pueh Lee
Vibro-acoustic modulation (VAM) is a form of a non-destructive testing technique used in nonlinear acoustic methods for the detection of defects. It comprises of exciting the structure with a dual frequency sinusoidal signal and studying the interaction of this wave with the underlying defect. In this work a theoretical study on the mechanics of VAM is presented for a generic material body. The roles of different types of defect on the response of the material are analyzed. The theoretical analysis shows the origins of the nonlinear frequencies in the form of higher harmonics and sidebands commonly observed in the output response of VAM excitation...
April 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28463323/suboptimal-maximum-likelihood-detection-of-on-off-keying-for-a-wireless-optical-communication-system
#9
Ruijie Li, Shengli Ding, Anhong Dang
This paper investigates a detection scheme without channel state information for wireless optical communication systems. Employing conventional on-off keying signals, we supposed that conditional probability density function P(r|0) is much bigger than P(r|1) when r<0. Under this assumption, the suboptimal maximum likelihood scheme is obtained by utilizing the probability density function without channel information. Theoretical analysis shows the performance of the proposed scheme is close to the maximum likelihood symbol-by-symbol detection...
May 1, 2017: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/28452516/anomalous-quantum-correlations-of-squeezed-light
#10
B Kühn, W Vogel, M Mraz, S Köhnke, B Hage
Three different noise moments of field strength, intensity, and their correlations are simultaneously measured. For this purpose a homodyne cross-correlation measurement [1] is implemented by superimposing the signal field and a weak local oscillator on an unbalanced beam splitter. The relevant information is obtained via the intensity noise correlation of the output modes. Detection details like quantum efficiencies or uncorrelated dark noise are meaningless for our technique. Yet unknown insight in the quantumness of a squeezed signal field is retrieved from the anomalous moment, correlating field strength with intensity noise...
April 14, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28442335/do-impulsive-individuals-benefit-more-from-food-go-no-go-training-testing-the-role-of-inhibition-capacity-in-the-no-go-devaluation-effect
#11
Zhang Chen, Harm Veling, Ap Dijksterhuis, Rob W Holland
Not responding to food items in a go/no-go task can lead to devaluation of these food items, which may help people regulate their eating behavior. The Behavior Stimulus Interaction (BSI) theory explains this devaluation effect by assuming that inhibiting impulses triggered by appetitive foods elicits negative affect, which in turn devalues the food items. BSI theory further predicts that the devaluation effect will be stronger when food items are more appetitive and when individuals have low inhibition capacity...
April 22, 2017: Appetite
https://www.readbyqxmd.com/read/28430779/a-coevolution-analysis-for-identifying-protein-protein-interactions-by-fourier-transform
#12
Changchuan Yin, Stephen S-T Yau
Protein-protein interactions (PPIs) play key roles in life processes, such as signal transduction, transcription regulations, and immune response, etc. Identification of PPIs enables better understanding of the functional networks within a cell. Common experimental methods for identifying PPIs are time consuming and expensive. However, recent developments in computational approaches for inferring PPIs from protein sequences based on coevolution theory avoid these problems. In the coevolution theory model, interacted proteins may show coevolutionary mutations and have similar phylogenetic trees...
2017: PloS One
https://www.readbyqxmd.com/read/28427290/a-real-time-method-for-decoding-the-neural-drive-to-muscles-using-single-channel-intra-muscular-emg-recordings
#13
Saeed Karimimehr, Hamid Reza Marateb, Silvia Muceli, Marjan Mansourian, Miguel Angel Mañanas, Dario Farina
The neural command from motor neurons to muscles - sometimes referred to as the neural drive to muscle - can be identified by decomposition of electromyographic (EMG) signals. This approach can be used for inferring the voluntary commands in neural interfaces in patients with limb amputations. This paper proposes for the first time an innovative method for fully automatic and real-time intramuscular EMG (iEMG) decomposition. The method is based on online single-pass density-based clustering and adaptive classification of bivariate features, using the concept of potential measure...
March 20, 2017: International Journal of Neural Systems
https://www.readbyqxmd.com/read/28406675/how-does-it-feel-a-signal-detection-approach-to-feeling-generation
#14
Anat Karmon-Presser, Gal Sheppes, Nachshon Meiran
Feeling, or the subjective emotional experience, is a fundamental element of the emotional reaction, yet past attempts to understand the mechanisms of feeling generation remain limited. The current study presents a signal detection theory (SDT) conceptualization of feeling generation. Accordingly, feeling, like other sensations, reflects an outcome of an inner decision regarding the emotional evidence, and, therefore, can be evaluated via 2 processes: evidence differentiation (d')-the ability to emotionally differentiate between external stimuli, given the essentially noisy evidence-and criterion (c)-the report threshold, or amount of evidence needed to have an intense reportable feeling...
April 13, 2017: Emotion
https://www.readbyqxmd.com/read/28402880/sedimentation-of-reversibly-interacting-macromolecules-with-changes-in-fluorescence-quantum-yield
#15
Sumit K Chaturvedi, Huaying Zhao, Peter Schuck
Sedimentation velocity analytical ultracentrifugation with fluorescence detection has emerged as a powerful method for the study of interacting systems of macromolecules. It combines picomolar sensitivity with high hydrodynamic resolution, and can be carried out with photoswitchable fluorophores for multicomponent discrimination, to determine the stoichiometry, affinity, and shape of macromolecular complexes with dissociation equilibrium constants from picomolar to micromolar. A popular approach for data interpretation is the determination of the binding affinity by isotherms of weight-average sedimentation coefficients sw...
April 11, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28388052/mapping-charge-distribution-in-single-pbs-core-cds-arm-nano-multipod-heterostructures-by-off-axis-electron-holography
#16
Rajesh Chalasani, Alexander Pekin, Alexander Rabkin, Ran E Abutbul, Oswaldo Diéguez, Yaron Kauffmann, Yuval Golan, Amit Kohn
We synthesized PbS core-CdS arm nanomultipod heterostructures (NMHs) that exhibit PbS{111}/CdS{0002} epitaxial relations. The PbS-CdS interface is chemically sharp as determined by aberration corrected transmission electron microscopy (TEM) and compared to density functional theory (DFT) calculations. Ensemble fluorescence measurements show quenching of the optical signal from the CdS arms indicating charge separation due to the heterojunction with PbS. A finite-element three-dimensional (3D) calculation of the Poisson equation shows a type-I heterojunction, which would prevent recombination in the CdS arm after optical excitation...
April 13, 2017: Nano Letters
https://www.readbyqxmd.com/read/28388031/identification-of-lanthanide-iii-luminophores-in-magnetic-circularly-polarized-luminescence-using-raman-optical-activity-instrumentation
#17
Tao Wu, Josef Kapitán, Valery Andrushchenko, Petr Bouř
Luminescence of lanthanide(III) ions sensitively reflects atomic environment. However, the signal may be weak and covered by Raman scattering. In the present study magnetic circularly polarized luminescence (MCPL) is explored as a more sensitive tool to recognize the lanthanide signal and assign underlying electronic transitions. MCPL spectra of the Na3[Ln(DPA)3] (Ln = Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, and Er) complexes were recorded on a Raman optical activity (ROA) instrument. The ROA spectrometer equipped with the 532 nm laser excitation sensitively detects differences in scattering of left- and right-circularly polarized light caused by the magnetic field...
April 13, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28374658/the-inner-world-of-overactive-monitoring-neural-markers-of-interoception-in-obsessive-compulsive-disorder
#18
A Yoris, A M García, L Traiber, H Santamaría-García, M Martorell, F Alifano, R Kichic, J S Moser, M Cetkovich, F Manes, A Ibáñez, L Sedeño
BACKGROUND: Obsessive-compulsive disorder (OCD) patients typically overmonitor their own behavior, as shown by symptoms of excessive doubt and checking. Although this is well established for the patients' relationship with external stimuli in the environment, no study has explored their monitoring of internal body signals, a process known to be affected in anxiety-related syndromes. Here, we explored this issue through a cardiac interoception task that measures sensing of heartbeats. Our aim was to explore key behavioral and electrophysiological aspects of internal-cue monitoring in OCD, while examining their potential distinctiveness in this condition...
April 4, 2017: Psychological Medicine
https://www.readbyqxmd.com/read/28369631/microfabrication-of-a-gadolinium-derived-solid-state-sensor-for-thermal-neutrons
#19
Kent B Pfeifer, Komandoor E Achyuthan, Matthew Allen, Michele L B Denton, Michael P Siegal, Ronald P Manginell
Neutron sensing is critical in civilian and military applications. Conventional neutron sensors are limited by size, weight, cost, portability and helium supply. Here the microfabrication of gadolinium (Gd) conversion material-based heterojunction diodes for detecting thermal neutrons using electrical signals produced by internal conversion electrons (ICEs) is described. Films with negligible stress were produced at the tensile-compressive crossover point, enabling Gd coatings of any desired thickness by controlling the radiofrequency sputtering power and using the zero-point near p(Ar) of 50 mTorr at 100 W...
March 25, 2017: Journal of Radiation Research
https://www.readbyqxmd.com/read/28369103/chemical-reaction-network-theory-elucidates-sources-of-multistability-in-interferon-signaling
#20
Irene Otero-Muras, Pencho Yordanov, Joerg Stelling
Bistability has important implications in signaling pathways, since it indicates a potential cell decision between alternative outcomes. We present two approaches developed in the framework of the Chemical Reaction Network Theory for easy and efficient search of multiple steady state behavior in signaling networks (both with and without mass conservation), and apply them to search for sources of bistability at different levels of the interferon signaling pathway. Different type I interferon subtypes and/or doses are known to elicit differential bioactivities (ranging from antiviral, antiproliferative to immunomodulatory activities)...
April 2017: PLoS Computational Biology
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