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Tingting Wu, Alexander J Dufford, Melissa-Ann Mackie, Laura J Egan, Jin Fan
Cognitive control refers to the processes that permit selection and prioritization of information processing in different cognitive domains to reach the capacity-limited conscious mind. Although previous studies have suggested that the capacity of cognitive control itself is limited, a direct quantification of this capacity has not been attempted. In this behavioral study, we manipulated the information rate of cognitive control by parametrically varying both the uncertainty of stimul measured as information entropy and the exposure time of the stimuli...
2016: Scientific Reports
Mohammad Mahfuz, Dimitrios Makrakis, Hussein T Mouftah
Unlike normal diffusion, in anomalous diffusion, the movement of a molecule is described by the correlated random walk model where the mean square displacement of a molecule depends on the power law of time. In molecular communication (MC), there are many scenarios when the propagation of molecules cannot be described by normal diffusion process, where anomalous diffusion is a better fit. In this paper, the effects of anomalous subdiffusion on concentration-encoded molecular communication (CEMC) are investigated...
July 7, 2016: IEEE Transactions on Nanobioscience
Nicola Prezza, Francesco Vezzi, Max Käller, Alberto Policriti
BACKGROUND: Bisulfite treatment of DNA followed by sequencing (BS-seq) has become a standard technique in epigenetic studies, providing researchers with tools for generating single-base resolution maps of whole methylomes. Aligning bisulfite-treated reads, however, is a computationally difficult task: bisulfite treatment decreases the (lexical) complexity of low-methylated genomic regions, and C-to-T mismatches may reflect cytosine unmethylation rather than SNPs or sequencing errors. Further challenges arise both during and after the alignment phase: data structures used by the aligner should be fast and should fit into main memory, and the methylation-caller output should be somehow compressed, due to its significant size...
2016: BMC Bioinformatics
Revital Huber-Shalem, Ofer Hadar, Stanley R Rotman, Merav Huber-Lerner
Infrared (IR) imagery sequences are commonly used for detecting moving targets in the presence of evolving cloud clutter or background noise. This research focuses on slow-moving point targets that are less than one pixel in size, such as aircraft at long range from a sensor. Since transmitting IR imagery sequences to a base unit or storing them consumes considerable time and resources, a compression method that maintains the point target detection capabilities is highly desirable. In this work, we introduce a new parametric temporal compression that incorporates Gaussian fit and polynomial fit...
February 10, 2016: Applied Optics
M P Arnold, L D Burger, D Wirz, B Goepfert, M T Hirschmann
PURPOSE: The purpose was to investigate graft slippage and ultimate load to failure of a femoral press-fit fixation technique for anterior cruciate ligament (ACL) reconstruction. METHODS: Nine fresh-frozen knees were used. Standardized harvesting of the B-PT-B graft was performed. The femora were cemented into steel rods, and a tunnel was drilled outside-in into the native ACL footprint and expanded using a manual mill bit. The femoral bone block was fixed press-fit...
January 7, 2016: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
Li Min Li, Sharon Johnson
UNLABELLED: The 'Time is Brain" concept has been a major focus in the World Stroke Awareness Campaign. OBJECTIVE: We describe our experience with a Hackathon (junction of hack+marathon), a 24 hour event of innovation- and technology-based project development, focused around detecting stroke. METHOD: The Hackathon was held during a Brazilian Student's union (BRASA) congress involving students from engineering and other technological disciplines...
December 2015: Arquivos de Neuro-psiquiatria
Jinwu Wei, Hongmei Feng, Zengtai Zhu, Qingfang Liu, Jianbo Wang
A short-circuited coplanar waveguide jig was proposed due to its simple structure and potential applications, which was successfully used to measure the permeability spectra of magnetic thin film. The result obtained from the coplanar waveguide (CPW) jig exhibits typical ferromagnetic resonance spectra, which can be well fitted by a trade-off equation because the measured permeability spectra have a bit of asymmetry because of the special intensity distribution of the microwave magnetic field in the CPW. In order to confirm the availability of the shorted CPW jig, a previous short-circuited microstrip line jig was used to measure the permeability spectra of the same sample...
November 2015: Review of Scientific Instruments
Rongfeng Cui, Molly Schumer, Gil G Rosenthal
UNLABELLED: We introduce a new forward-time simulator, Admix'em, that allows for rapid and realistic simulations of admixed populations with selection. Complex selection can be achieved through user-defined fitness and mating-preference probability functions. Users can specify realistic genomic landscapes and model neutral SNPs in addition to sites under selection. Admix'em is designed to simulate selection in admixed populations but can also be used as a general population simulator...
April 1, 2016: Bioinformatics
Cesar Carranza, Daniel Llamocca, Marios Pattichis
The discrete periodic radon transform (DPRT) has extensively been used in applications that involve image reconstructions from projections. Beyond classic applications, the DPRT can also be used to compute fast convolutions that avoids the use of floating-point arithmetic associated with the use of the fast Fourier transform. Unfortunately, the use of the DPRT has been limited by the need to compute a large number of additions and the need for a large number of memory accesses. This paper introduces a fast and scalable approach for computing the forward and inverse DPRT that is based on the use of: a parallel array of fixed-point adder trees; circular shift registers to remove the need for accessing external memory components when selecting the input data for the adder trees; an image block-based approach to DPRT computation that can fit the proposed architecture to available resources; and fast transpositions that are computed in one or a few clock cycles that do not depend on the size of the input image...
January 2016: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
A Eugene DePrince, C David Sherrill
We present an algorithm for coupled-cluster through perturbative triples [CCSD(T)] based on a t1-dressed Hamiltonian and the use of density fitting (DF) or Cholesky decomposition (CD) approximations for the construction and contraction of all electron repulsion integrals (ERIs). An efficient implementation of this algorithm is then used to explore whether preoptimized density fitting basis sets [specifically, the (aug-)cc-pVXZ-RI series designed for DF-MP2 computations] are suitable for DF-CCSD(T) computations and how they compare to the CD representation of the integrals...
June 11, 2013: Journal of Chemical Theory and Computation
Chao Qian, Yang Yu, Zhi-Hua Zhou
Many optimization tasks must be handled in noisy environments, where the exact evaluation of a solution cannot be obtained, only a noisy one. For optimization of noisy tasks, evolutionary algorithms (EAs), a type of stochastic metaheuristic search algorithm, have been widely and successfully applied. Previous work mainly focuses on the empirical study and design of EAs for optimization under noisy conditions, while the theoretical understandings are largely insufficient. In this study, we firstly investigate how noisy fitness can affect the running time of EAs...
October 20, 2015: Evolutionary Computation
Chi-Wai Chow, Chung-Yen Chen, Shih-Hao Chen
Complementary Metal-Oxide-Semiconductor (CMOS) image sensors are widely used in mobile-phone and cameras. Hence, it is attractive if these image sensors can be used as the visible light communication (VLC) receivers (Rxs). However, using these CMOS image sensors are challenging. In this work, we propose and demonstrate a VLC link using mobile-phone camera with data rate higher than frame rate of the CMOS image sensor. We first discuss and analyze the features of using CMOS image sensor as VLC Rx, including the rolling shutter effect, overlapping of exposure time of each row of pixels, frame-to-frame processing time gap, and also the image sensor "blooming" effect...
October 5, 2015: Optics Express
Markus Kubicek, Rafael Schmitt, Felix Messerschmitt, Jennifer L M Rupp
Resistive switches based on anionic electronic conducting oxides are promising devices to replace transistor-based memories due to their excellent scalability and low power consumption. In this study, we create a model switching system by manufacturing resistive switches based on ultrathin 5 nm, epitaxial, and grain boundary-free strontium titanate thin films with subnanometer surface roughness. For our model devices, we unveil two competing nonvolatile resistive switching processes being of different polarities: one switching in clockwise and the other in counterclockwise direction...
November 24, 2015: ACS Nano
Relja Arandjelović, Andrew Zisserman
The goal of this work is a data structure to support approximate nearest neighbor search on very large scale sets of vector descriptors. The criteria we wish to optimize are: (i) that the memory footprint of the representation should be very small (so that it fits into main memory); and (ii) that the approximation of the original vectors should be accurate. We introduce a novel encoding method, named a Set Compression Tree (SCT), that satisfies these criteria. It is able to accurately compress 1 million descriptors using only a few bits per descriptor...
December 2014: IEEE Transactions on Pattern Analysis and Machine Intelligence
Keisuke Toyoda, Eiichirou Urasaki, Tetsuya Umeno, Waka Sakai, Akiko Nagaishi, Shunya Nakane, Takayasu Fukudome, Yuzo Yamakawa
Deep brain stimulation (DBS) is performed by burr hole surgery. In microelectrode recording by multi-channel parallel probe, because all microelectrodes do not always fit in the burr hole, additional drilling to enlarge the hole is occasionally required, which is time consuming and more invasive. We report a stereotactic burr hole technique to avoid additional drilling, and the efficacy of this novel technique compared with the conventional procedure. Ten patients (20 burr holes) that received DBS were retrospectively analyzed (5 in the conventional burr hole group and 5 in the stereotactic burr hole group)...
2015: Neurologia Medico-chirurgica
Yichun Wu, Lingzhi Wang, Yuanfeng Cai, Cunqiao Wu
A novel method based on logarithmic derivative is introduced to analyze multi-lifetime decay. As the discharge voltage signal of a RC circuit is a special kind of multi-lifetime exponential decay, the logarithmic derivative method can be used to measure single capacitance and multiple capacitances. With the logarithmic derivative method, a log(t) curve strongly peaked at precisely log(τ) is obtained, where the lifetime τ equals to RC. In a measurement system, if the resistance R is known, then the capacitance under test can be calculated...
August 2015: Review of Scientific Instruments
Marcelo Costa
Edge plays special role in spatial perception and in determining the lightness information of the surface within borders. The aim of our study was to measure suprathreshold brightness in different levels of edges hardness. Steven's Power Law for circles modulating in luminance were estimated for 10 subjects (mean age 25 SD 3, 5 female). Stimuli and psychophysical procedures were built using Psyknematix software (v1.4.3, KiberVision, Montreal, Canada) installed in iMAC OS 10.8 X (Apple Inc., USA). Stimuli were presented on the iMAC display using 11 bit graphic board and consisted of two circles of 3 degrees of visual angle, separated by 10 degrees...
2015: Journal of Vision
Daniel Gill, Lisa DeBruine, Benedict Jones, Philippe Schyns
Humans have the ability to process facial stimuli and compare them with facial information retrieved from memory. Cues from an input can provide information that enables the observer to infer bits of information about the signaller's identity, age, gender and other characteristics. Reverse correlation methods can reveal the memorized information content, formed as a classification image, that enables the perceiver to resolve these categorization tasks. The most typical method adds white noise to a fixed template serving as a basis...
2015: Journal of Vision
Seyed Pourya Hoseini Alinodehi, Sajjad Moshfe, Masoumeh Saber Zaeimian, Abdollah Khoei, Khairollah Hadidi
In this paper, an ultrafast steady-state genetic algorithm processor (GAP) is presented. Due to the heavy computational load of genetic algorithms (GAs), they usually take a long time to find optimum solutions. Hardware implementation is a significant approach to overcome the problem by speeding up the GAs procedure. Hence, we designed a digital CMOS implementation of GA in [Formula: see text] process. The proposed processor is not bounded to a specific application. Indeed, it is a general-purpose processor, which is capable of performing optimization in any possible application...
July 2016: IEEE Transactions on Cybernetics
Ami M DuBois, John David Lee, Abdulgadar F Almagri
A new high time resolution x-ray detector has been installed on the Madison Symmetric Torus (MST) to make measurements around sawtooth events. The detector system is comprised of a silicon avalanche photodiode, a 20 ns Gaussian shaping amplifier, and a 500 MHz digitizer with 14-bit sampling resolution. The fast shaping time diminishes the need to restrict the amount of x-ray flux reaching the detector, limiting the system dead-time. With a much higher time resolution than systems currently in use in high temperature plasma physics experiments, this new detector has the versatility to be used in a variety of discharges with varying flux and the ability to study dynamics on both slow and fast time scales...
July 2015: Review of Scientific Instruments
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