Log in

Relevant bibliographies by topics / Alignment of signals / Journal articles

To see the other types of publications on this topic, follow the link: Alignment of signals.

Journal articles on the topic 'Alignment of signals'

Author: Grafiati

Published: 4 June 2021

Last updated: 18 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Alignment of signals.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Vedder, C. J. G., and N. E. Chisari. "Galaxy clusters as intrinsic alignment tracers: present and future." Monthly Notices of the Royal Astronomical Society 500, no. 4 (November 26, 2020): 5561–69. http://dx.doi.org/10.1093/mnras/staa3633.

Full text

Abstract:

ABSTRACT Galaxies and clusters embedded in the large-scale structure of the Universe are observed to align in preferential directions. Galaxy alignment has been established as a potential probe for cosmological information, but the application of cluster alignments for these purposes remains unexplored. Clusters are observed to have a higher alignment amplitude than galaxies, but because galaxies are much more numerous, the trade-off in detectability between the two signals remains unclear. We present forecasts comparing cluster and galaxy alignments for two extragalactic survey set-ups: a currently available low-redshift survey (Sloan Digital Sky Survey, SDSS) and an upcoming higher redshift survey (Legacy Survey of Space and Time, LSST). For SDSS, we rely on the publicly available redmapper catalogue to describe the cluster sample. For LSST, we perform estimations of the expected number counts while we extrapolate the alignment measurements from SDSS. Clusters in SDSS have typically higher alignment signal-to-noise ratio (S/N) than galaxies. For LSST, the cluster alignment signals quickly wash out with redshift due to a relatively low number count and a decreasing alignment amplitude. Nevertheless, a potential strong suit of clusters is in their interplay with weak lensing: intrinsic alignments can be more easily isolated for clusters than for galaxies. The S/N of cluster alignment can in general be improved by isolating close pairs along the line of sight.

APA, Harvard, Vancouver, ISO, and other styles

2

Coakley, K. J., and P. Hale. "Alignment of noisy signals." IEEE Transactions on Instrumentation and Measurement 50, no. 1 (2001): 141–49. http://dx.doi.org/10.1109/19.903892.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Jiang, Yihang, Yuankai Qi, Will Ke Wang, Brinnae Bent, Robert Avram, Jeffrey Olgin, and Jessilyn Dunn. "EventDTW: An Improved Dynamic Time Warping Algorithm for Aligning Biomedical Signals of Nonuniform Sampling Frequencies." Sensors 20, no. 9 (May 9, 2020): 2700. http://dx.doi.org/10.3390/s20092700.

Full text

Abstract:

The dynamic time warping (DTW) algorithm is widely used in pattern matching and sequence alignment tasks, including speech recognition and time series clustering. However, DTW algorithms perform poorly when aligning sequences of uneven sampling frequencies. This makes it difficult to apply DTW to practical problems, such as aligning signals that are recorded simultaneously by sensors with different, uneven, and dynamic sampling frequencies. As multi-modal sensing technologies become increasingly popular, it is necessary to develop methods for high quality alignment of such signals. Here we propose a DTW algorithm called EventDTW which uses information propagated from defined events as basis for path matching and hence sequence alignment. We have developed two metrics, the error rate (ER) and the singularity score (SS), to define and evaluate alignment quality and to enable comparison of performance across DTW algorithms. We demonstrate the utility of these metrics on 84 publicly-available signals in addition to our own multi-modal biomedical signals. EventDTW outperformed existing DTW algorithms for optimal alignment of signals with different sampling frequencies in 37% of artificial signal alignment tasks and 76% of real-world signal alignment tasks.

APA, Harvard, Vancouver, ISO, and other styles

4

Chen, Xun. "Accurate alignment on asymmetrical signals." Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures 15, no. 6 (November 1997): 2185. http://dx.doi.org/10.1116/1.589610.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Yao, Xiang Wen, Yun Peng Hu, Zhi Xiang Shen, and Cai Yao Shen. "A Method of Multi-Antenna Signal Time-Delay Alignment Algorithm for Cyclostationary Signals." Applied Mechanics and Materials 536-537 (April 2014): 3–8. http://dx.doi.org/10.4028/www.scientific.net/amm.536-537.3.

Full text

Abstract:

In the signal combining system of deep space network, the estimation error of time-delay between signals will reduce the effectiveness. The time-delay alignment technique based on combined output signal as the reference (CC-SUMPLE algorithm) makes use of the mutual information offered by multi-antenna and improves the alignment performance. However, it only takes ordinary cross-correlation into consideration rather than the cyclostationary of digital communication signal during calculating time-delay in the iterative process. As to this problem, this paper proposes multi-antenna signal time-delay alignment algorithm based on cyclostationary of communication signal (MCCC-SUMPLE algorithm) which reconstructs the combined reference signal and takes advantage of multi-cycle frequencies. The simulation results show that the proposed algorithm will improve the estimation accuracy and time-delay alignment performance compared with CC-SUMPLE algorithm.

APA, Harvard, Vancouver, ISO, and other styles

6

Laroche, C., T. Leroux, C. Giguère, and P. Poirier. "Field Evaluation of Audible Traffic Signals for Blind Pedestrians." Proceedings of the Human Factors and Ergonomics Society Annual Meeting 44, no. 22 (July 2000): 730–33. http://dx.doi.org/10.1177/154193120004402261.

Full text

Abstract:

The project aims to single out an audible traffic signal or a pair of audible traffic signals that would enable blind pedestrians to cross intersections safely. This is carried out in three phases: 1) measuring walking alignment and crossing time of blind pedestrian subjects within a simulated corridor, with four different simultaneous traffic signals (cuckoo, peep-peep, 4-note melody and neo-cuckoo) presented in a quiet environment, 2) measuring alignment with audible traffic signals alternating on each end of the simulated corridor, in a quiet environment and 3) measuring alignment at a busy real intersection. This paper reports on the results of the first two phases. The 4-note melody originally proposed by Hall et al. (1996) and modified in a recent study (Laroche et al., 1999) gave better results in terms of localization and perception of safety than any other signals specified in the Canadian standard (Transportation Association of Canada, 1992). Audible traffic signals alternating back and forth on each side of the corridor gave better results than signals presented simultaneously from both sides.

APA, Harvard, Vancouver, ISO, and other styles

7

Hara, Kenji. "An alignment technique using diffracted moiré signals." Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures 7, no. 6 (November 1989): 1977. http://dx.doi.org/10.1116/1.584660.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Zhang, Yanshun, Baichao Ding, Xiaojuan Huang, Tao Yang, and Xiaodong Liu. "Multi-Sensor, Adjustable-Period Integrated Navigation Method Based on Multi-Stage Signal Trigger for Underwater Vehicles." Journal of Navigation 71, no. 1 (August 29, 2017): 208–20. http://dx.doi.org/10.1017/s0373463317000571.

Full text

Abstract:

For underwater vehicle navigation sensors, the output signal periods are different and time-varying. This would result in the decline of precision, and even wrong results. To deal with the problem, this paper puts forward a multi-sensor, adjustable-period integrated navigation method based on multi-stage signal trigger. This method considers the valid signals of a Doppler Velocity Log (DVL) as the trigger signals of a Dead-Reckoning (DR) navigation program. It also considers the valid signals of an acoustic positioning sensor as the trigger signals of the integrated navigation program. In this method, it can adjust the filtering period in real time. According to the time label of signals, this method actualises the time-space alignment of sensors. Then it conducts DR navigation and integrated navigation. The method can not only utilise the valid signals of each sensor sufficiently but also fuses the data based on time-space alignment efficiently. Sea trial data shows that when the output signal periods are certain, navigation precision of the method in this paper is better than a non-adjustable-period filtering method. Moreover, in poor conditions, it can also attain a high precision.

APA, Harvard, Vancouver, ISO, and other styles

9

Pandya, Viraj, Joel Primack, Peter Behroozi, Avishai Dekel, Haowen Zhang, Elliot Eckholm, Sandra M. Faber, et al. "Can intrinsic alignments of elongated low-mass galaxies be used to map the cosmic web at high redshift?" Monthly Notices of the Royal Astronomical Society 488, no. 4 (August 2, 2019): 5580–93. http://dx.doi.org/10.1093/mnras/stz2129.

Full text

Abstract:

ABSTRACT Hubble Space Telescope observations show that low-mass ($M_*=10^9\!-\!10^{10}\, \mathrm{M}_{\odot }$) galaxies at high redshift (z = 1.0–2.5) tend to be elongated (prolate) rather than disky (oblate) or spheroidal. This is explained in zoom-in cosmological hydrodynamical simulations by the fact that these galaxies are forming in cosmic web filaments where accretion happens preferentially along the direction of elongation. We ask whether the elongated morphology of these galaxies allows them to be used as effective tracers of cosmic web filaments at high redshift via their intrinsic alignments. Using mock light cones and spectroscopically confirmed galaxy pairs from the Cosmic Assembly Near-infared Deep Extragalactic Legacy Survey (CANDELS), we test two types of alignments: (1) between the galaxy major axis and the direction to nearby galaxies of any mass and (2) between the major axes of nearby pairs of low-mass, likely prolate, galaxies. The mock light cones predict strong signals in 3D real space, 3D redshift space, and 2D projected redshift space for both types of alignments (assuming prolate galaxy orientations are the same as those of their host prolate haloes), but we do not detect significant alignment signals in CANDELS observations. However, we show that spectroscopic redshifts have been obtained for only a small fraction of highly elongated galaxies, and accounting for spectroscopic incompleteness and redshift errors significantly degrades the 2D mock signal. This may partly explain the alignment discrepancy and highlights one of several avenues for future work.

APA, Harvard, Vancouver, ISO, and other styles

10

Chen, X. "Performance of adaptive alignment method on asymmetric signals." Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures 16, no. 6 (November 1998): 3637. http://dx.doi.org/10.1116/1.590318.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Marsh, Terry, and Paul Pfleiderer. "Alpha Signals, Smart Betas, and Factor Model Alignment." Journal of Portfolio Management 42, no. 5 (May 31, 2016): 51–66. http://dx.doi.org/10.3905/jpm.2016.42.5.051.

Full text

APA, Harvard, Vancouver, ISO, and other styles

12

Lee, Geun-Cheol, and David L. Woodruff. "Beam search for peak alignment of NMR signals." Analytica Chimica Acta 513, no. 2 (June 2004): 413–16. http://dx.doi.org/10.1016/j.aca.2004.02.068.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Islam, Md Saiful, and Naif Alajlan. "A morphology alignment method for resampled heartbeat signals." Biomedical Signal Processing and Control 8, no. 3 (May 2013): 315–24. http://dx.doi.org/10.1016/j.bspc.2012.11.006.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

Sun, Huer, Zhao Jian Yang, Qun Long Liang, and Xin Yu Pang. "Characteristics Identification of Overlapping Vibration Signals on Mallat." Advanced Materials Research 97-101 (March 2010): 4375–78. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.4375.

Full text

Abstract:

In rotor-bearing system running, vibration signals measured were an kind of Multi-vibration source signals which is overlapping each other. These overlapping signals were difficult to be separated by the ordinary methods, which is adverse to precisely estimate faults of rotor-bearing system in running. In this paper, a test rig was set up to simulate mis-alignment faults; collected vibration signals of bearings were decomposed and reconstructed by algorithm of Mallat. Reconstructed signal can reflect detail character s of bearings vibration. And vibration signals characteristics of fault rotor were effectively identified.

APA, Harvard, Vancouver, ISO, and other styles

15

Zhang, Youcai, Xiaohu Yang, and Hong Guo. "Galaxy–group (halo) alignments from SDSS DR7 and the ELUCID simulation." Monthly Notices of the Royal Astronomical Society 500, no. 2 (August 18, 2020): 1895–904. http://dx.doi.org/10.1093/mnras/staa2356.

Full text

Abstract:

ABSTRACT Based on galaxies from the Sloan Digital Sky Survey (SDSS) and subhaloes in the corresponding reconstructed region from the constrained simulation of ELUCID, we study the alignment of central galaxies relative to their host groups in the group catalogue, as well as the alignment relative to the corresponding subhaloes in the ELUCID simulation. Galaxies in observation are matched to dark matter subhaloes in the ELUCID simulation using a novel neighborhood abundance matching method. In observation, the major axes of galaxies are found to be preferentially aligned to the major axes of their host groups. There is a colour dependence of galaxy–group alignment that red centrals have a stronger alignment along the major axes of their host groups than blue centrals. Combining galaxies in observation and subhaloes in the ELUCID simulation, we also find that central galaxies have their major axes to be aligned to the major axes of their corresponding subhaloes in the ELUCID simulation. We find that the galaxy–group and galaxy–subhalo alignment signals are stronger for galaxies in more massive haloes. We find that the alignments between main subhaloes and the SDSS-matched subhalo systems in simulation are slightly stronger than the galaxy–group alignments in observation.

APA, Harvard, Vancouver, ISO, and other styles

16

Wen, Zhi, Chen Lu, and Hong Mei Liu. "Feature Extraction Technology for Rolling Bearings Based on Local Tangent Space Alignment." Applied Mechanics and Materials 764-765 (May 2015): 274–79. http://dx.doi.org/10.4028/www.scientific.net/amm.764-765.274.

Full text

Abstract:

Health assessment and fault diagnosis for rolling bearings mostly adopt traditional methods, such as time-frequency, spectral, and wavelet packet analyses, to extract the feature vector. These methods are suitable for processing data with a linear structure. However, for the non-linear and non-stationary signal, the result of these methods is not ideal. Thus, this study proposes a suitable method to extract the feature vector in nonlinear signals. Local tangent space alignment of a manifold algorithm is employed to extract the feature vector from the rolling bearings. Results verify the advantage of the manifold algorithm for non-linear and non-stationary signals.

APA, Harvard, Vancouver, ISO, and other styles

17

Zhang Jinlong, 张金龙, 徐慧 Xu Hui, 刘京南 Liu Jingnan, and 龚珊珊 Gong Shanshan. "Ultra-precision Alignment System Based on Diffracting Moiré Signals." Acta Optica Sinica 31, s1 (2011): s100513. http://dx.doi.org/10.3788/aos201131.s100513.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

Molina Mojica, Angel Valentin, Manuel Barbaro Cuadra Sanz, Luis Javier Martinez Guerrero, and Hordelin Robles. "Analysis through dynamic temporal sequence alignment in SpO2 signals." TECCIENCIA 11, no. 21 (August 30, 2016): 39–43. http://dx.doi.org/10.18180/tecciencia.2016.21.7.

Full text

APA, Harvard, Vancouver, ISO, and other styles

19

McFarland, Dennis J. "Phase-alignment of delayed sensory signals by adaptive filters." Behavioral and Brain Sciences 31, no. 2 (April 2008): 212. http://dx.doi.org/10.1017/s0140525x08003956.

Full text

Abstract:

AbstractCorrection of sensory transmission delays is an intractable problem, since there is no absolute reference for calibration. Phase-alignment is a practical alternative solution and can be realized by adaptive filters that operate locally with simple error signals.

APA, Harvard, Vancouver, ISO, and other styles

20

Morimoto, H., Y. Sasaki, H. Onoda, and T. Kato. "Detection of alignment signals for focused ion beam lithography." Applied Physics Letters 46, no. 9 (May 1985): 898–900. http://dx.doi.org/10.1063/1.95880.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Li, R., and R. Chellappa. "Spatiotemporal Alignment of Visual Signals on a Special Manifold." IEEE Transactions on Pattern Analysis and Machine Intelligence 35, no. 3 (March 2013): 697–715. http://dx.doi.org/10.1109/tpami.2012.144.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Kuniyoshi, Shinji. "Contrast improvement of alignment signals from resist coated patterns." Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures 5, no. 2 (March 1987): 555. http://dx.doi.org/10.1116/1.583948.

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

Zhang, Ran, Qingsong Hu, Gang Wang, and Bin Ye. "Distributed Compressed Sensing of Microseismic Signals Through First Break Time Extraction and Signal Alignment." IEEE Access 6 (2018): 27408–17. http://dx.doi.org/10.1109/access.2018.2830974.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

Chattaraj, Suvendu, and Abhik Mukherjee. "Utilizing Time Redundancy for Particle Filter-Based Transfer Alignment." Fluctuation and Noise Letters 15, no. 04 (September 29, 2016): 1650024. http://dx.doi.org/10.1142/s0219477516500243.

Full text

Abstract:

Signal detection in the presence of high noise is a challenge in natural sciences. From understanding signals emanating out of deep space probes to signals in protein interactions for systems biology, domain specific innovations are needed. The present work is in the domain of transfer alignment (TA), which deals with estimation of the misalignment of deliverable daughter munitions with respect to that of the delivering mother platform. In this domain, the design of noise filtering scheme has to consider a time varying and nonlinear system dynamics at play. The accuracy of conventional particle filter formulation suffers due to deviations from modeled system dynamics. An evolutionary particle filter can overcome this problem by evolving multiple system models through few support points per particle. However, this variant has even higher time complexity for real-time execution. As a result, measurement update gets deferred and the estimation accuracy is compromised. By running these filter algorithms on multiple processors, the execution time can be reduced, to allow frequent measurement updates. Such scheme ensures better system identification so that performance improves in case of simultaneous ejection of multiple daughters and also results in better convergence of TA algorithms for single daughter.

APA, Harvard, Vancouver, ISO, and other styles

25

He, Zhi Kuan, Song Bo Wu, and Yu Gui Zhang. "Optimal Design of CCD Driving Signal Based on FLEX 10K." Advanced Materials Research 571 (September 2012): 725–29. http://dx.doi.org/10.4028/www.scientific.net/amr.571.725.

Full text

Abstract:

In this paper, an optimal design method for a CCD driving signal is proposed. Strict phase alignment of CCD driving signals is achieved. Through the analysis of FLEX 10K internal resources, the CCD driving pin voltage overshoots are eliminated on the basis of meeting the phase relationship. The experimental results show that the requirements for the phase of the CCD driving signals are satisfied, and the voltages on CCD pins become stabile. Therefore, CCD can be protected from damage.

APA, Harvard, Vancouver, ISO, and other styles

26

Welker, C., J. Bland-Hawthorn, J. Van de Sande, C. Lagos, P. Elahi, D. Obreschkow, J. Bryant, et al. "The SAMI Galaxy Survey: first detection of a transition in spin orientation with respect to cosmic filaments in the stellar kinematics of galaxies." Monthly Notices of the Royal Astronomical Society 491, no. 2 (October 12, 2019): 2864–84. http://dx.doi.org/10.1093/mnras/stz2860.

Full text

Abstract:

ABSTRACT We present the first detection of mass-dependent galactic spin alignments with local cosmic filaments with >2σ confidence using IFS kinematics. The 3D network of cosmic filaments is reconstructed on Mpc scales across GAlaxy and Mass Assembly fields using the cosmic web extractor DisPerSe. We assign field galaxies from the SAMI survey to their nearest filament segment in 3D and estimate the degree of alignment between SAMI galaxies’ kinematic spin axis and their nearest filament in projection. Low-mass galaxies align their spin with their nearest filament while higher mass counterparts are more likely to display an orthogonal orientation. The stellar transition mass from the first trend to the second is bracketed between $10^{10.4}$ and $10^{10.9}\, \mathrm{ M}_{\odot }$, with hints of an increase with filament scale. Consistent signals are found in the Horizon-AGN cosmological hydrodynamic simulation. This supports a scenario of early angular momentum build-up in vorticity rich quadrants around filaments at low stellar mass followed by progressive flip of spins orthogonal to the cosmic filaments through mergers at high stellar mass. Conversely, we show that dark matter only simulations post-processed with a semi-analytical model treatment of galaxy formation struggles to reproduce this alignment signal. This suggests that gas physics is key in enhancing the galaxy-filament alignment.

APA, Harvard, Vancouver, ISO, and other styles

27

Eremenko, V. S., V. P. Babak, and A. O. Zaporozhets. "METHOD OF REFERENCE SIGNALS CREATING IN NON-DESTRUCTIVE TESTING BASED ON LOW-SPEED IMPACT." Tekhnichna Elektrodynamika 2021, no. 4 (June 17, 2021): 70–82. http://dx.doi.org/10.15407/techned2021.04.070.

Full text

Abstract:

The article describes the approach to the formation of a simulation model of information signals, which are typical for objects with different types of defects. The dispersive analysis of the signal spectrum components in the bases of the discrete Hartley transform and the discrete cosine transform is carried out. The analysis of the form of the reconstructed information signal is carried out depending on the number of coefficients of the spectral alignment in Hartley bases and cosine functions. The basis of orthogonal functions of a discrete argument is obtained, which can be used for the spectral transformation of information signals of a flaw detector. A method of simulation of information signals has been developed and experimentally investigated, which allows taking into account the deterministic and random components of the characteristics of real information signals. References 24, figures 13, tables 3.

APA, Harvard, Vancouver, ISO, and other styles

28

Skutkova, Helena, Martin Vitek, Karel Sedlar, and Ivo Provaznik. "Progressive alignment of genomic signals by multiple dynamic time warping." Journal of Theoretical Biology 385 (November 2015): 20–30. http://dx.doi.org/10.1016/j.jtbi.2015.08.007.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

Hefetz, Yaron, Nergis Mavalvala, and Daniel Sigg. "Principles of calculating alignment signals in complex resonant optical interferometers." Journal of the Optical Society of America B 14, no. 7 (July 1, 1997): 1597. http://dx.doi.org/10.1364/josab.14.001597.

Full text

APA, Harvard, Vancouver, ISO, and other styles

30

Di Lena, Pietro, and Luciano Margara. "Optimal global alignment of signals by maximization of Pearson correlation." Information Processing Letters 110, no. 16 (July 2010): 679–86. http://dx.doi.org/10.1016/j.ipl.2010.05.024.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

Zheng, Wen Jun. "Anisotropic Reflectivity of Rubbed Polyimide Liquid Crystal Alignment Layer." Key Engineering Materials 428-429 (January 2010): 309–16. http://dx.doi.org/10.4028/www.scientific.net/kem.428-429.309.

Full text

Abstract:

The surface optical anisotropy of rubbed polyimide films has been detected using reflection anisotropy spectroscopy. The amplitude of the reflection anisotropy signals increases with the rubbing strength. Rubbing also causes changes in pretilt angle of liquid crystal molecules which are in contact with the rubbed polyimide. An increase in rubbing strength results in an increase in the pretilt angel. The pretilt of the liquid crystal molecules was found to linearly correlate with the amplitude of the RA signals.

APA, Harvard, Vancouver, ISO, and other styles

32

Kahl, Lorenz, and Ulrich G. Hofmann. "Removal of ECG artifacts from EMG signals with different artifact magnitudes by template subtraction." Current Directions in Biomedical Engineering 5, no. 1 (September 1, 2019): 357–59. http://dx.doi.org/10.1515/cdbme-2019-0090.

Full text

Abstract:

AbstractThis work investigates the performance of eventsynchronous noise cancelling algorithms to separate ECG artifacts from thoracic EMG recordings. In focus are the precise detection of heart beats, the exact time alignment of the QRS segments and the construction of a template QRS signal. Among the utilized methods is a modified structural intensity (SI) approach based on the observation of extrema in low pass filtered versions of the second derivative as a detector. An adoption of this approach is also used to obtain the exact time alignment of QRS segments. Artificial test signals are constructed based on addition of ECG and sEMG with different magnitudes. We show that approaches based on the observation of extrema in different scales yield superior results.

APA, Harvard, Vancouver, ISO, and other styles

33

O'Connor, Brian J., H. John Yack, and Scott C. White. "Reducing Errors in Kinetic Calculations: improved Synchronization of Video and Ground Reaction Force Records." Journal of Applied Biomechanics 11, no. 2 (May 1995): 216–23. http://dx.doi.org/10.1123/jab.11.2.216.

Full text

Abstract:

A strategy is presented for temporally aligning ground reaction force and kinematic data. Alignment of these data requires marking both the force and video records at a common event. The strategy uses the information content of the video signal, which is A/D converted along with the ground reaction force analog signals, to accomplish this alignment in time. The vertical blanking pulses in the video signal, which define the start of each video field, can be readily identified, provided the correct A/D sampling rate is selected. Knowledge of the position of these vertical blanking pulses relative to the synchronization pulse makes it possible to precisely align the video and analog data in time. Choosing an A/D sampling rate of 598 Hz would enable video and analog data to be synchronized to within 1/1,196 s. Minimizing temporal alignment error results in greater accuracy and .reliability in calculations used to determine joint kinetics.

APA, Harvard, Vancouver, ISO, and other styles

34

Song, Kai, Kun Wang, Heng Yu, Yue Zhang, Zhongqiang Huang, Weihua Luo, Xiangyu Duan, and Min Zhang. "Alignment-Enhanced Transformer for Constraining NMT with Pre-Specified Translations." Proceedings of the AAAI Conference on Artificial Intelligence 34, no. 05 (April 3, 2020): 8886–93. http://dx.doi.org/10.1609/aaai.v34i05.6418.

Full text

Abstract:

We investigate the task of constraining NMT with pre-specified translations, which has practical significance for a number of research and industrial applications. Existing works impose pre-specified translations as lexical constraints during decoding, which are based on word alignments derived from target-to-source attention weights. However, multiple recent studies have found that word alignment derived from generic attention heads in the Transformer is unreliable. We address this problem by introducing a dedicated head in the multi-head Transformer architecture to capture external supervision signals. Results on five language pairs show that our method is highly effective in constraining NMT with pre-specified translations, consistently outperforming previous methods in translation quality.

APA, Harvard, Vancouver, ISO, and other styles

35

Aurahs, Ralf, Markus GÖker, Guido W. Grimm, Vera Hemleben, Christoph Hemleben, Ralf Schiebel, and Michal Kučera. "Using the Multiple Analysis Approach to Reconstruct Phylogenetic Relationships among Planktonic Foraminifera from Highly Divergent and Length-polymorphic SSU rDNA Sequences." Bioinformatics and Biology Insights 3 (January 2009): BBI.S3334. http://dx.doi.org/10.4137/bbi.s3334.

Full text

Abstract:

The high sequence divergence within the small subunit ribosomal RNA gene (SSU rDNA) of foraminifera makes it difficult to establish the homology of individual nucleotides across taxa. Alignment-based approaches so far relied on time-consuming manual alignments and discarded up to 50% of the sequenced nucleotides prior to phylogenetic inference. Here, we investigate the potential of the multiple analysis approach to infer a molecular phylogeny of all modern planktonic foraminiferal taxa by using a matrix of 146 new and 153 previously published SSU rDNA sequences. Our multiple analysis approach is based on eleven different automated alignments, analysed separately under the maximum likelihood criterion. The high degree of congruence between the phylogenies derived from our novel approach, traditional manually homologized culled alignments and the fossil record indicates that poorly resolved nucleotide homology does not represent the most significant obstacle when exploring the phylogenetic structure of the SSU rDNA in planktonic foraminifera. We show that approaches designed to extract phylogenetically valuable signals from complete sequences show more promise to resolve the backbone of the planktonic foraminifer tree than attempts to establish strictly homologous base calls in a manual alignment.

APA, Harvard, Vancouver, ISO, and other styles

36

Dong, Shaojiang, Lili Chen, Baoping Tang, Xiangyang Xu, Zhengyuan Gao, and Juan Liu. "Rotating Machine Fault Diagnosis Based on Optimal Morphological Filter and Local Tangent Space Alignment." Shock and Vibration 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/893504.

Full text

Abstract:

In order to identify the fault of rotating machine effectively, a new method based on the morphological filter optimized by particle swarm optimization algorithm (PSO) and the nonlinear manifold learning algorithm local tangent space alignment (LTSA) is proposed. Firstly, the signal is purified by the morphological filter; the filter’s structure element (SE) is selected by PSO method. Then the filtered signals are decomposed by the empirical mode decomposition (EMD) method, and the extract features are mapped into the LTSA to extract the character features; then the support vector machine (SVM) model is used to achieve the rotating machine fault diagnosis. The proposed method is evaluated by vibration signals measured from bearings with faults. Results show that the method can effectively remove the noise and extract the fault features, so the rotating machine fault diagnosis can be achieved effectively.

APA, Harvard, Vancouver, ISO, and other styles

37

Song, Hang, Afreen Azhari, Xia Xiao, Eiji Suematsu, Hiromasa Watanabe, and Takamaro Kikkawa. "Microwave Imaging Using CMOS Integrated Circuits with Rotating 4 × 4 Antenna Array on a Breast Phantom." International Journal of Antennas and Propagation 2017 (2017): 1–13. http://dx.doi.org/10.1155/2017/6757048.

Full text

Abstract:

A digital breast cancer detection system using 65 nm technology complementary metal oxide semiconductor (CMOS) integrated circuits with rotating 4 × 4 antenna array is presented. Gaussian monocycle pulses are generated by CMOS logic circuits and transmitted by a 4 × 4 matrix antenna array via two CMOS single-pole-eight-throw (SP8T) switching matrices. Radar signals are received and converted to digital signals by CMOS equivalent time sampling circuits. By rotating the 4 × 4 antenna array, the reference signal is obtained by averaging the waveforms from various positions to extract the breast phantom target response. A signal alignment algorithm is proposed to compensate the phase shift of the signals caused by the system jitter. After extracting the scattered signal from the target, a bandpass filter is applied to reduce the noise caused by imperfect subtraction between original and the reference signals. The confocal imaging algorithm for rotating antennas is utilized to reconstruct the breast image. A 1 cm3 bacon block as a cancer phantom target in a rubber substrate as a breast fat phantom can be detected with reduced artifacts.

APA, Harvard, Vancouver, ISO, and other styles

38

Codis, S., Y. Dubois, C. Pichon, J. Devriendt, and A. Slyz. "How the cosmic web induces intrinsic alignments of galaxies." Proceedings of the International Astronomical Union 11, S308 (June 2014): 437–42. http://dx.doi.org/10.1017/s1743921316010322.

Full text

Abstract:

AbstractIntrinsic alignments are believed to be a major source of systematics for future generation of weak gravitational lensing surveys like Euclid or LSST. Direct measurements of the alignment of the projected light distribution of galaxies in wide field imaging data seem to agree on a contamination at a level of a few per cent of the shear correlation functions, although the amplitude of the effect depends on the population of galaxies considered. Given this dependency, it is difficult to use dark matter-only simulations as the sole resource to predict and control intrinsic alignments. We report here estimates on the level of intrinsic alignment in the cosmological hydrodynamical simulation Horizon-AGN that could be a major source of systematic errors in weak gravitational lensing measurements. In particular, assuming that the spin of galaxies is a good proxy for their ellipticity, we show how those spins are spatially correlated and how they couple to the tidal field in which they are embedded. We will also present theoretical calculations that illustrate and qualitatively explain the observed signals.

APA, Harvard, Vancouver, ISO, and other styles

39

Breeze, Ruth. "Negotiating alignment in newspaper editorials." Pragmatics. Quarterly Publication of the International Pragmatics Association (IPrA) 26, no. 1 (March 1, 2016): 1–19. http://dx.doi.org/10.1075/prag.26.1.01bre.

Full text

Abstract:

Newspaper editorials are shaped by the need to negotiate alignment and rapport with a diverse readership. This is achieved partly through the resources of engagement (Martin and White 2005), that is, through the argumentative moves of disclaim, proclaim, entertain and attribute, by which dialogic relations with the reader are carefully modulated. One aspect of argumentation in editorials that has sometimes been overlooked is that of the concede-counter structure, by which the writer signals concurrence with the reader on a particular issue, only to counter this with a new argument that may wholly or partially refute the first one. Typically, leader writers signal this manoeuvre textually from the outset, indicating that they are setting up an argument in order to demolish it by means of specific lexical choices or patterns. Thus items such as “of course” or “naturally” are used to build up the first argument, with which the reader is understood to concur. This is generally followed by a turning point marked by “but”, “yet” or “though”, after which the counter-argument is presented. Corpus linguists have pointed out that the presence of this type of lexical patterning makes it possible to research argumentation in large volumes of text using corpus tools. This study contains an analysis of concede-counter patterns in a corpus consisting of all the editorials published in the Guardian newspaper in 2011. The distinctive patterns that emerge are described, with particular attention paid to patterns of alignment and disalignment that emerge, as well as the related use of concurrence in asides to the reader. The role of such patterns in structuring discourse is analysed, with a particular focus on their ideological dimension as a means of subtly aligning readers with a particular set of opinions.

APA, Harvard, Vancouver, ISO, and other styles

40

Goyal, Gauri. "Practical Applications of Alpha Signals, Smart Beta, and Factor Model Alignment." Practical Applications 4, no. 2 (October 31, 2016): 1.7–5. http://dx.doi.org/10.3905/pa.2016.4.2.172.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Azzopardi, Gabriella, Gianluca Valentino, Adrian Muscat, and Belen Salvachua. "Automatic spike detection in beam loss signals for LHC collimator alignment." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 934 (August 2019): 10–18. http://dx.doi.org/10.1016/j.nima.2019.04.057.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

Forshed, Jenny, Ina Schuppe-Koistinen, and Sven P. Jacobsson. "Peak alignment of NMR signals by means of a genetic algorithm." Analytica Chimica Acta 487, no. 2 (July 2003): 189–99. http://dx.doi.org/10.1016/s0003-2670(03)00570-1.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

Saez-Landete, JosÉ, Sancho Salcedo-Sanz, Fernando Cruz-Roldan, Pedro Amo-Lopez, and Manuel Blanco-Velasco. "Design of Two-Dimensional Optical Alignment Signals Robust to Diffractive Effects." Journal of Lightwave Technology 26, no. 12 (June 2008): 1702–7. http://dx.doi.org/10.1109/jlt.2008.919428.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

Bracco, Emanuele, Ben Lockwood, Francesco Porcelli, and Michela Redoano. "Intergovernmental grants as signals and the alignment effect: Theory and evidence." Journal of Public Economics 123 (March 2015): 78–91. http://dx.doi.org/10.1016/j.jpubeco.2014.11.007.

Full text

APA, Harvard, Vancouver, ISO, and other styles

45

Kalitzin, S., W. Zbijewski, J. Parra, D. Velis, L. Manshanden, and F. Lopes da Silva. "Correlation-based alignment of multichannel signals and application to paroxysmal events." IEEE Transactions on Biomedical Engineering 49, no. 9 (September 2002): 1068–70. http://dx.doi.org/10.1109/tbme.2002.802060.

Full text

APA, Harvard, Vancouver, ISO, and other styles

46

Lawrence, C., S. Altschul, M. Boguski, J. Liu, A. Neuwald, and J. Wootton. "Detecting subtle sequence signals: a Gibbs sampling strategy for multiple alignment." Science 262, no. 5131 (October 8, 1993): 208–14. http://dx.doi.org/10.1126/science.8211139.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

Daszykowski, M., and B. Walczak. "Target selection for alignment of chromatographic signals obtained using monochannel detectors." Journal of Chromatography A 1176, no. 1-2 (December 2007): 1–11. http://dx.doi.org/10.1016/j.chroma.2007.10.099.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

Dauwels, Justin, Theophane Weber, François Vialatte, Toshimitsu Musha, and Andrzej Cichocki. "Quantifying Statistical Interdependence, Part III: N > 2 Point Processes." Neural Computation 24, no. 2 (February 2012): 408–54. http://dx.doi.org/10.1162/neco_a_00235.

Full text

Abstract:

Stochastic event synchrony (SES) is a recently proposed family of similarity measures. First, “events” are extracted from the given signals; next, one tries to align events across the different time series. The better the alignment, the more similar the N time series are considered to be. The similarity measures quantify the reliability of the events (the fraction of “nonaligned” events) and the timing precision. So far, SES has been developed for pairs of one-dimensional (Part I) and multidimensional (Part II) point processes. In this letter (Part III), SES is extended from pairs of signals to N > 2 signals. The alignment and SES parameters are again determined through statistical inference, more specifically, by alternating two steps: (1) estimating the SES parameters from a given alignment and (2), with the resulting estimates, refining the alignment. The SES parameters are computed by maximum a posteriori (MAP) estimation (step 1), in analogy to the pairwise case. The alignment (step 2) is solved by linear integer programming. In order to test the robustness and reliability of the proposed N-variate SES method, it is first applied to synthetic data. We show that N-variate SES results in more reliable estimates than bivariate SES. Next N-variate SES is applied to two problems in neuroscience: to quantify the firing reliability of Morris-Lecar neurons and to detect anomalies in EEG synchrony of patients with mild cognitive impairment. Those problems were also considered in Parts I and II, respectively. In both cases, the N-variate SES approach yields a more detailed analysis.

APA, Harvard, Vancouver, ISO, and other styles

49

Yao, Yi, Shuang Pan, and Gao Chao. "An In-Flight Emergency Alignment Scheme for Aircraft MINS with Assistant of Airborne SAR." Applied Mechanics and Materials 367 (August 2013): 339–46. http://dx.doi.org/10.4028/www.scientific.net/amm.367.339.

Full text

Abstract:

The alignment of a strapdown inertial navagation system (SDINS) is the process whereby the orientation of body frame is determined with respect to the navigation frame [. In a broad sense, alignment of SDINS can be classified as initial alignment and in-flight alignment (IFA). The IFA is performed with IMU and external sensors during the vehicle flight [2,, in which the primary assistant sources are satellite system, radar, or other airborne equipment, offering reference signals like position, velocity, or attitude to assist the alignment process [4,. However, these sources have disadvantages in redundancy, independence, and stability, which will be incipient faults in emergency take-off or warfare. So it is necessary for us to analyse the subsidiary airborne equipments and design new in-flight alignment scheme.

APA, Harvard, Vancouver, ISO, and other styles

50

Zheng, Xingjian, Bo Wang, and Yongqi Ge. "A Segmentation Model of ECU Excitation Signal Based on Characteristic Parameters." Sensors 21, no. 12 (June 17, 2021): 4165. http://dx.doi.org/10.3390/s21124165.

Full text

Abstract:

According to the basic structure and working principle of the excitation signal sensors of a diesel engine electronic control unit (ECU), a segmentation model of an ECU excitation signal based on characteristic parameters (ESCP-SM) is proposed. In the ESCP-SM, the ECU excitation signal is divided into several parts, and each part has its characteristic parameters model. By using the same global parameters and strictly controlling each part’s proportional parameters, the ESCP-SM can achieve signal alignment and dynamic frequency modulation. Based on the simulation experiment, spectrum analysis proves that this modeling method ensures that the original signal’s effective information is not lost. Pearson similarity analysis shows that the similarity between the simulation signal and practical signal reaches 74%, exhibiting strong correlation. In addition, we set up a physical testing environment. ESCP-SM is realized based on virtual instrument technology, and provides excitation signals for a Komatsu 8 ECU. By modifying the parameter configuration, the ECU can drive the injector to work correctly.

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!