Relevant bibliographies by topics / Signal variation

Academic literature on the topic 'Signal variation'

Author: Grafiati
Published: 10 December 2022
Last updated: 29 January 2023

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Journal articles on the topic "Signal variation"

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Hu, Wei Bing, Wei Hu, and Yu Zheng. "Wavelet Analysis in Damage Detection for Bridge Structure." Key Engineering Materials 417-418 (October 2009): 813–16. http://dx.doi.org/10.4028/www.scientific.net/kem.417-418.813.

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The damage of structure leads to variation of structural modal parameter，so the wavelet transform for damage detection is introduced in this paper for considering the variation. First, structural dynamic response signal on the basis of the vibration-based structural damage diagnosis methods is calculated by structural analysis in the paper, then, each of sub-signals is calculated according to wavelet analysis, also, the sub-signal energy spectrum of dynamic response signal and energy spectrum variation are known. By observing the difference of the sub-signal and the variation of the sub-signal energy spectrum, we can get the variation of structural modal parameter and the sub-signal energy spectrum due to the performance degradation of the whole structure and local variations of damage level and location ,so that this method can be used in on-line damage detection for bridge structure.
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Kämpke, Thomas. "Signal quantization by variation." International Journal of Adaptive Control and Signal Processing 25, no. 12 (July 25, 2011): 1061–73. http://dx.doi.org/10.1002/acs.1264.

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Curry, Claire M., and Michael A. Patten. "Complex spatiotemporal variation in processes shaping song variation." Behaviour 156, no. 10 (2019): 1057–82. http://dx.doi.org/10.1163/1568539x-00003556.

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Abstract Understanding factors that contribute to song divergence bolsters our understanding of signal evolution and reproductive isolation. Hybrid zones often occur across environmental gradients; as such, they are excellent places to examine how signals diverge and how differentiation is maintained. We studied song variation across two hybrid zones, one old and one recent, of Tufted Titmouse (Baeolophus bicolor) and Black-crested Titmouse (B. atricristatus), across an environmental gradient where the two titmouse populations meet. In the recent zone, noise and vegetation structure were correlated with several song characteristics, but in the older zone, these features did not correlate despite similar gradients in song features. Our data, combined with previous studies, suggest that despite overall similarities in characteristics, songs in the older zone may be more shaped by sexual selection, whereas songs in the young zone are shaped by environment. Thus, even within the same species, processes shaping signal structure can vary spatially and temporally.
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Manap, Mustafa, Abdul Rahim Abdullah, Srete Nikolovski, Tole Sutikno, and Mohd Hatta Jopri. "An improved smooth-windowed Wigner-Ville distribution analysis for voltage variation signal." International Journal of Electrical and Computer Engineering (IJECE) 10, no. 5 (October 1, 2020): 4982. http://dx.doi.org/10.11591/ijece.v10i5.pp4982-4991.

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This paper outlines research conducted using bilinear time-frequency distribution (TFD), a smooth-windowed wigner-ville distribution (SWWVD) used to represent time-varying signals in time-frequency representation (TFR). Good time and frequency resolutions offer superiority in SWWVD to analyze voltage variation signals that consist of variations in magnitude. The separable kernel parameters are estimated from the signal in order to get an accurate TFR. The TFR for various kernel parameters is compared by a set of performance measures. The evaluation shows that different kernel settings are required for different signal parameters. Verification of the TFD that operated at optimal kernel parameters is then conducted. SWWVD exhibits a good performance of TFR which gives high peak-to-side lobe ratio (PSLR) and signal-to-cross-terms ratio (SCR) accompanied by low main-lobe width (MLW) and absolute percentage error (APE). This proved that the technique is appropriate for voltage variation signal analysis and it essential for development in an advanced embedded system.
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Chauhan, Bhag C. "7Beneutrino signal variation in KamLAND." Journal of High Energy Physics 2006, no. 02 (February 15, 2006): 035. http://dx.doi.org/10.1088/1126-6708/2006/02/035.

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Derryberry, Elizabeth P. "Male response to historical and geographical variation in bird song." Biology Letters 7, no. 1 (August 4, 2010): 57–59. http://dx.doi.org/10.1098/rsbl.2010.0519.

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In many species, individuals discriminate among sexual signals of conspecific populations in the contexts of mate choice and male–male competition. Differences in signals among populations (geographical variation) are in part the result of signal evolution within populations (temporal variation). Understanding the relative effect of temporal and geographical signal variation on signal salience may therefore provide insight into the evolution of behavioural discrimination. However, no study, to my knowledge, has compared behavioural response to historical signals with response to current signal variation among populations. Here, I measured the response of male white-crowned sparrows ( Zonotrichia leucophrys ) to historical songs compared with current songs from their local population, a nearby non-local population and a distant population. Males responded most strongly to current local songs, less, but equally, to historical local and current non-local songs, and least to songs of the distant population. Moreover, response to both temporal and geographical variation in song was proportional to how much songs differed acoustically from current local songs. Signal evolution on an ecological time scale appears to have an effect on signal salience comparable to differences found between current neighbouring populations, supporting the idea that behavioural discrimination among learned signals of conspecific populations can evolve relatively rapidly.
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Blankers, Thomas, Rik Lievers, Camila Plata, Michiel van Wijk, Dennis van Veldhuizen, and Astrid T. Groot. "Sex pheromone signal and stability covary with fitness." Royal Society Open Science 8, no. 6 (June 2021): 210180. http://dx.doi.org/10.1098/rsos.210180.

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If sexual signals are costly, covariance between signal expression and fitness is expected. Signal–fitness covariance is important, because it can contribute to the maintenance of genetic variation in signals that are under natural or sexual selection. Chemical signals, such as female sex pheromones in moths, have traditionally been assumed to be species-recognition signals, but their relationship with fitness is unclear. Here, we test whether chemical, conspecific mate finding signals covary with fitness in the moth Heliothis subflexa . Additionally, as moth signals are synthesized de novo every night, the maintenance of the signal can be costly. Therefore, we also hypothesized that fitness covaries with signal stability (i.e. lack of temporal intra-individual variation). We measured among- and within-individual variation in pheromone characteristics as well as fecundity, fertility and lifespan in two independent groups that differed in the time in between two pheromone samples. In both groups, we found fitness to be correlated with pheromone amount, composition and stability, supporting both our hypotheses. This study is, to our knowledge, the first to report a correlation between fitness and sex pheromone composition in moths, supporting evidence of condition-dependence and highlighting how signal–fitness covariance may contribute to heritable variation in chemical signals both among and within individuals.
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Carneiro, Mirella, Victor Oliveira, Fernanda Oliveira, Marco Teixeira, and Milena Pinto. "Simulation Analysis of Signal Conditioning Circuits for Plants’ Electrical Signals." Technologies 10, no. 6 (November 25, 2022): 121. http://dx.doi.org/10.3390/technologies10060121.

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Electrical signals are generated and transmitted through plants in response to stimuli caused by external environment factors, such as touching, luminosity, and leaf burning. By analyzing a specific plant’s electrical responses, it is possible to interpret the impact of external aspects in the plasma membrane potential and, thus, determine the cause of the electrical signal. Moreover, these signals permit the whole plant structure to be informed almost instantaneously. This work presents a brief discussion of plants electrophysiology theory and low-cost signal conditioning circuits, which are necessary for the acquisition of plants’ electrical signals. Two signal conditioning circuits, which must be chosen depending on the signal to be measured, are explained in detail and electrical simulation results, performed in OrCAD Capture Software are presented. Furthermore, Monte Carlo simulations were performed to evaluate the impact of components variations on the accuracy and efficiency of the signal conditioning circuits. Those simulations showed that, even after possible component variations, the filters’ cut-off frequencies had at most 4% variation from the mean.
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Iwuji, Prince Chigozie, and Victor Chukwuagozie Onuabuchi. "Investigation of Diurnal Variation of Signal Strength Generated by FM Transmitter." European Scientific Journal, ESJ 14, no. 18 (June 30, 2018): 235. http://dx.doi.org/10.19044/esj.2018.v14n18p235.

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This paper focuses on the determination of the diurnal variation of signal strength generated by Orient 94.4 FM transmitter along six (6) selected route in Imo State, Nigeria. This was carried out with the aid of a constructed signal strength meter (SSM). Signal strength measurements were collected at different time, on different days, and in different months. The measurement was carried out at a constant distance of 20 Km. Arrangement was made with the management of the base station to ensure that the transmitting parameters were kept constant throughout the period of signal strength measurement. The average results of these measurements were taken. The data obtained from the measurements was plotted in a graph to establish the diurnal variation in signal strength along the different routes of signal strength measurement. It was observed from this research that transmission and reception of signals are dependent on the time of the day. High signal strength was noted between the hours of 8 am and 11 am, while low signal strength was recorded between the hours of 1 pm and 5 pm. Better signal strengths were recorded at night. The result of this study shows that signal strength generated by FM transmitter vary with time of the day and the prevalent weather conditions. Stronger signals are recorded mostly at night along the different routes of the study. The signal strength consequently drops in the afternoon and recovers in the morning hours.
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Santhosh, Sheeba. "Bio Impedance Signal Analysis with Variation in Input Signal Frequency." International Journal of Advanced Trends in Computer Science and Engineering 9, no. 4 (August 25, 2020): 5332–36. http://dx.doi.org/10.30534/ijatcse/2020/167942020.

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Dissertations / Theses on the topic "Signal variation"

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Wissner-Gross, Zachary Daniel. "Signal variation in single particle aerosol mass spectrometry." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/40921.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2007.
Includes bibliographical references (p. 33-34).
Rapid and accurate detection of airborne micro-particles is currently an important problem in national security. One approach to such detection, bioaerosol mass spectrometry (BAMS), is currently under development at Lawrence Livermore National Laboratory. BAMS is a type of single particle aerosol mass spectrometry that rapidly records dual-polarity mass spectra of aerosolized micro-particles. However, the accuracy of the BAMS system is limited by various uncertainties, resulting in shot-to-shot variations in the mass spectra. I found that the variations in mass peak areas in BAMS spectra were significantly larger than those predicted by Poisson statistics based on the mean number of detected ions. Furthermore, these variations were surprisingly consistent as a function of peak area among synthetic, organic, and biological samples. For both positive and negative ions, the standard deviation in a peak's area was approximately proportional to the mean value of that area to the 0.9 power. Using the consistency of this data, I also developed a novel method for quantitatively evaluating the similarity between mass spectra using a chi-square factor. Peak area variations in other single particle aerosol mass spectrometers may be similarly analyzed and used to improve methods for rapid particle identification.
by Zachary Daniel Wissner-Gross.
S.B.
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Travis, David J., Vernon Meentemeyer, and Roger P. Belanger. "Stressed Trees Produce a Better Climatic Signal than Healthy Trees." Tree-Ring Society, 1990. http://hdl.handle.net/10150/261930.

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The basis for the selection of trees to be used in the production of dendrochronologies has long been an issue (Douglass 1946; Fritts 1976). In humid regions the common practice has been to use trees that appear to be in good health. As a part of a larger study involving the impact of ice storms on tree-ring increments (Travis 1989), we show that trees stressed as a result of ice damage produced a stronger climatic signal than nondamaged trees.
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McCarter, Rebecca. "Total Variation Based Restoration of Bilevel Waveforms." VCU Scholars Compass, 2012. http://scholarscompass.vcu.edu/etd/2767.

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A series of Total Variation based algorithms are presented for the restoration of bilevel waveforms from observed signals. The proposed model is discussed analytically and numerically via the gradient descent minimization of the TV energy. The application of restoration of bilevel waveforms encoded within barcode images is presented. A super- resolution technique is proposed as a reduction of dimensionality of the image data. The result is a high resolution image from which the encoded bilevel waveform is restored. Implementation of results is shown for synthetic and real images.
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Cauley, P. Wilson, Seth Redfield, Adam G. Jensen, and Travis Barman. "VARIATION IN THE PRE-TRANSIT BALMER LINE SIGNAL AROUND THE HOT JUPITER HD 189733B." IOP PUBLISHING LTD, 2016. http://hdl.handle.net/10150/621234.

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As followup to our recent detection of a pre-transit signal around HD 189733 b, we obtained full pre-transit phase coverage of a single planetary transit. The pre-transit signal is again detected in the Balmer lines but with variable strength and timing, suggesting that the bow shock geometry reported in our previous work does not describe the signal from the latest transit. We also demonstrate the use of the Ca II H and K residual core flux as a proxy for the stellar activity level throughout the transit. A moderate trend is found between the pre-transit absorption signal in the 2013 data and the Ca II H flux. This suggests that some of the 2013 pre-transit hydrogen absorption can be attributed to varying stellar activity levels. A very weak correlation is found between the Ca II H core flux and the Balmer line absorption in the 2015 transit, hinting at a smaller contribution from stellar activity compared to the 2013 transit. We simulate how varying stellar activity levels can produce changes in the Balmer line transmission spectra. These simulations show that the strength of the 2013 and 2015 pre-transit signals can be reproduced by stellar variability. If the pre-transit signature is attributed to circumplanetary material, its evolution in time can be described by accretion clumps spiraling toward the star, although this interpretation has serious limitations. Further high-cadence monitoring at H alpha is necessary to distinguish between true absorption by transiting material and short-term variations in the stellar activity level.
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Rudolf, Robert. "Design methods to mitigate the effects of variation in analogue and mixed-signal circuits." Thesis, University of Southampton, 2014. https://eprints.soton.ac.uk/374300/.

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The continued scaling of CMOS process features enables ever-faster and denser circuits, which comes at the cost of increased device parameter variation. The performance of analogue and mixed-signal circuits in particular degrades in such a high variation environment, which poses an extraordinary challenge in the design and fabrication of such circuits. This thesis develops a set of tools and methodologies for a post-fabrication calibration system called the Configurable Analogue Transistor (CAT). The principle of the CAT technique is to replace certain transistors in a circuit with calibration devices, which allow adjustment of circuit performance after fabrication to compensate the effects of device parameter variation. Building on initial research on the CAT, this thesis develops a methodology to identify the most suitable calibration devices in their circuit and determine their optimal sizes. Furthermore, the applicability of CAT is extended beyond parameter variation to also include direct compensation of temperature. A complementary technique to post-fabrication calibration is robust design, where a circuit is designed to be inherently robust against variation in device parameters. In this thesis, a novel closed-loop pick-off circuit for force-balanced MEMS accelerometers is presented. It is comparable in performance to other state-of-the-art techniques, but provides vastly improved robustness against parameter variation and a more intuitive design process.
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Page, Jennifer Lynn. "The effects of plume property variation on odor plume navigation in turbulent boundary layer flows." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/29752.

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Thesis (Ph.D)--Biology, Georgia Institute of Technology, 2009.
Committee Chair: Weissburg, Marc; Committee Member: Hay, Mark; Committee Member: Kubanek, Julia; Committee Member: Webster, Donald; Committee Member: Yen, Jeannette. Part of the SMARTech Electronic Thesis and Dissertation Collection.
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Riitters, Kurt H. "Evenness Indices Measure the Signal Strength of Biweight Site Chronologies." Tree-Ring Society, 1990. http://hdl.handle.net/10150/261927.

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The signal strength of a biweight site chronology is properly viewed as an outcome of analysis rather than as a property of the forest-climate system. It can be estimated by the evenness of the empirical weights that are assigned to individual trees. The approach is demonstrated for a 45-year biweight chronology obtained from 40 jack pine (Pinus banksiana Lamb.) trees. The annual evenness of the empirical weights is calculated by indices derived from the Shannon and Simpson diversity indices, and the variances are found by the jackknife procedure. The annual estimates are then averaged to find an overall estimate of biweight signal strength for the 45-year period. These techniques are most useful for determining sample sizes for the biweight procedure, and for comparing different methods of detrending and standardizing data sets prior to applying the biweight mean-value function.
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Ghai, Dhruva V. "Variability-aware low-power techniques for nanoscale mixed-signal circuits." Thesis, University of North Texas, 2009. https://digital.library.unt.edu/ark:/67531/metadc9850/.

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New circuit design techniques that accommodate lower supply voltages necessary for portable systems need to be integrated into the semiconductor intellectual property (IP) core. Systems that once worked at 3.3 V or 2.5 V now need to work at 1.8 V or lower, without causing any performance degradation. Also, the fluctuation of device characteristics caused by process variation in nanometer technologies is seen as design yield loss. The numerous parasitic effects induced by layouts, especially for high-performance and high-speed circuits, pose a problem for IC design. Lack of exact layout information during circuit sizing leads to long design iterations involving time-consuming runs of complex tools. There is a strong need for low-power, high-performance, parasitic-aware and process-variation-tolerant circuit design. This dissertation proposes methodologies and techniques to achieve variability, power, performance, and parasitic-aware circuit designs. Three approaches are proposed: the single iteration automatic approach, the hybrid Monte Carlo and design of experiments (DOE) approach, and the corner-based approach. Widely used mixed-signal circuits such as analog-to-digital converter (ADC), voltage controlled oscillator (VCO), voltage level converter and active pixel sensor (APS) have been designed at nanoscale complementary metal oxide semiconductor (CMOS) and subjected to the proposed methodologies. The effectiveness of the proposed methodologies has been demonstrated through exhaustive simulations. Apart from these methodologies, the application of dual-oxide and dual-threshold techniques at circuit level in order to minimize power and leakage is also explored.
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Hoang, Hung Gia Electrical Engineering &amp Telecommunications Faculty of Engineering UNSW. "A new variation of the frequency selective Kalman - Yakubovich - Popov lemma with applications in signal processing and control." Publisher:University of New South Wales. Electrical Engineering & Telecommunications, 2008. http://handle.unsw.edu.au/1959.4/43770.

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The Kalman-Yakubovich-Popov (KYP) lemma is a useful tool in control and signal processing that allows an important family of computationally intractable semi-infinite programs in the entire frequency range to be characterized by computationally tractable semidefinite programs. The first part of this thesis presents a new variation of the frequency selective Kalman-Yakubovich-Popov (FS-KYP) lemma for single input single output systems, which generalizes the conventional KYP lemma on given frequency intervals. Based on the transfer function representation of single input single output systems, the proposed FS-KYP lemma provides a unified framework to convert an important family of semi-infinite programs with generic frequency selective constraints that arise from a variety of analysis and synthesis problems for infinite impulse response systems into semidefinite programs. In contrast to existing variations of the FS-KYP lemma, which invariably involves Lyapunov variables of large dimensions, the proposed FS-KYP lemma is free from Lyapunov variables. As a consequence, the proposed semidefinite programs require a minimal number of additional variables, thus can be efficiently solved by general purpose semidefinite programming solvers on a standard personal computer. The second part of this thesis studies several applications of the FS-KYP lemma to control and signal processing. Firstly, we investigate the beam pattern synthesis of an antenna array with bounded sidelobe and mainlobe levels. It is shown that the pattern synthesis problem can be posed as a convex semi-infinite program that is turned into an semidefinite program via the proposed FS-KYP lemma. The attractive feature of the proposed method is that our semidefinite program uses only a minimal number of auxiliary variables. This subsequently enables the design of patterns for arrays with several hundred elements to be achieved on a standard personal computer using existing SDP solvers. Secondly, we develop an efficient method to design several types of digital and analog infinite impulse response filters and filter banks via the new FS-KYP lemma. The proposed method is more flexible than analytical methods in the sense that it allows direct control of more design parameters, which in turn enables more requirements such as degree of flatness to be incorporated into the design process. Finally, we examine some applications of the new FS-KYP to robustness analysis of continuous control systems. Specifically, we introduce a new bisection method to compute the H∞ gain of uncertain polytopic systems.
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Roquin, Claude. "Traitement des données en prospection géochimique : facteurs de variation du signal et sélection de la composante anomale /." Orléans : B.R.G.M, 1985. http://catalogue.bnf.fr/ark:/12148/cb34839296h.

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Books on the topic "Signal variation"

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Fulde, Michael. Variation Aware Analog and Mixed-Signal Circuit Design in Emerging Multi-Gate CMOS Technologies. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-3280-5.

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service), SpringerLink (Online, ed. Variation Aware Analog and Mixed-Signal Circuit Design in Emerging Multi-Gate CMOS Technologies. Dordrecht: Springer Netherlands, 2010.

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Wang, Ruotong. Sensitivity performance of adder channel collaborative coding multiple access communication systems to signal variation of individual users. [s.l.]: typescript, 1995.

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Roquin, Claude. Traitement des données en prospection géochimique: Facteurs de variation du signal et sélection de la composante anomale. Orléans: Editions du Bureau de recherches géologiques et minières, Service géologique national, 1985.

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Thráinsson, Höskuldur, Caroline Heycock, Hjalmar P. Petersen, and Zakaris Svabo Hansen, eds. Syntactic Variation in Insular Scandinavian. Amsterdam: John Benjamins Publishing Company, 2017. http://dx.doi.org/10.1075/sigl.1.

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Bernstein, Jacob. Seasonality: Systems, strategies, and signals. New York: Wiley, 1998.

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Šmídl, Václav. The variational Bayes method in signal processing. Berlin: Springer, 2006.

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Kooter, Peter M. De. Variations on autocorrelation matching and the sift localization algorithm. Monterey, Calif: Naval Postgraduate School, 1997.

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1943-, Bergman Bo, ed. Robust design methodology for reliability: Exploring the effects of variation and uncertainty. Chichester, U.K: Wiley, 2009.

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Six sigma in the pharmaceutical industry: Understanding, reducing, and controlling variation in pharmaceuticals and biologics. Boca Raton, FL: CRC Press/Taylor & Francis, 2007.

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Book chapters on the topic "Signal variation"

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Engel, Toby R., and Nawzer Mehta. "Reproducibility and variation in assessing late potentials." In Signal Averaged Electrocardiography, 221–48. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-0894-2_13.

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Rantzer, Anders. "Uncertain Real Parameters with Bounded Rate of Variation." In Adaptive Control, Filtering, and Signal Processing, 345–49. New York, NY: Springer New York, 1995. http://dx.doi.org/10.1007/978-1-4419-8568-2_15.

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Amaya, Iraida, Jeremy Pillet, and Kevin M. Folta. "Identification of Genes Responsible for Natural Variation in Volatile Content Using Next-Generation Sequencing Technology." In Plant Signal Transduction, 37–45. New York, NY: Springer New York, 2016. http://dx.doi.org/10.1007/978-1-4939-3115-6_4.

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Kamalaveni, V., S. Veni, and K. A. Narayanankuttty. "Performance Analysis of Adaptive Variable Exponent Based Total Variation Image Regularization Algorithm." In Computer, Communication, and Signal Processing, 128–50. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-11633-9_11.

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Ren, Wei, and Hao Jian. "The Comprehensive Evaluation of “Five Aspects” Based on Coefficient-of-Variation-Modified G1 Combination Weighting." In Sensor Networks and Signal Processing, 253–68. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-4917-5_20.

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Teong, Ong Jin, Yan Hong, and Shanmugam Ganeshkumar. "Spatial Variation of Digital Television Signal in an Indoor Environment." In Mobile and Wireless Communications, 191–98. Boston, MA: Springer US, 2003. http://dx.doi.org/10.1007/978-0-387-35618-1_23.

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Brzostowski, Krzysztof, and Jerzy Świątek. "Improving Variational Mode Decomposition-Based Signal Enhancement with the Use of Total Variation Denoising." In Trends in Artificial Intelligence Theory and Applications. Artificial Intelligence Practices, 649–60. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-55789-8_56.

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Sen, Shreyas, Vishwanath Natarajan, and Abhijit Chatterjee. "Low-Power Adaptive Mixed Signal/RF Circuits and Systems and Self-Healing Solutions." In Low-Power Variation-Tolerant Design in Nanometer Silicon, 293–333. Boston, MA: Springer US, 2010. http://dx.doi.org/10.1007/978-1-4419-7418-1_9.

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Lee, Thomas H. "Linearity, Time-Variation, Phase Modulation and Oscillator Phase Noise." In Selected Topics in RF, Analog and Mixed Signal Circuits and Systems, 9–39. New York: River Publishers, 2022. http://dx.doi.org/10.1201/9781003339441-2.

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Myo, Zin Mar, and Myat Thida Mon. "Analysis of Signal Variation Based on Path Loss in LTE Network." In Advances in Intelligent Systems and Computing, 209–18. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-23204-1_21.

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Conference papers on the topic "Signal variation"

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Vega, Miguel, Javier Mateos, Rafael Molina, and Aggelos K. Katsaggelos. "Variational Bayes Color Deconvolution with a Total Variation Prior." In 2019 27th European Signal Processing Conference (EUSIPCO). IEEE, 2019. http://dx.doi.org/10.23919/eusipco.2019.8902589.

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Xianyu, Wu, Hu Peifeng, and Yuan Zhenzhou. "Arterial Signal Timing Optimization Considering Speed Variation." In 2013 Fourth International Conference on Digital Manufacturing & Automation (ICDMA). IEEE, 2013. http://dx.doi.org/10.1109/icdma.2013.75.

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Shevchenko, A., and I. Fedyaev. "Local Slant Stack for Signal Variation Detection." In Saint Petersburg 2018. Netherlands: EAGE Publications BV, 2018. http://dx.doi.org/10.3997/2214-4609.201800311.

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Koo, Kil Mo, Kwang Il Ahan, Yong Mann Song, Joon Eon Yang, and Eung Seok Park. "Response Analysis From Transient Signal for Variation of R-C Passive Elements Under High Temperature Accident Condition in NPPs." In 16th International Conference on Nuclear Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/icone16-48356.

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The electrical signal could be checked whether it lies within its expected electrical range when it is doubtful condition. In the case of an abnormal transient signal from an instrument under a severe accident condition, it needs to define a signal validation to operate at control room in NPPs. Diagnostics and analysis for some abnormal transient signals have been also performed through the important equivalent circuits modeling for the passive elements under the conditions. Even under such a condition, the electrical signal should be within its expected range so that some mitigation actions can be taken through it in control room. Whereas, in case that an abnormal signal is expected from an instrument, such a signal should be refined through a signal validation process so that the refined signal could be available in the control room. For some abnormal signals expected under severe accident conditions, to date, diagnostics and response signals have been evaluated with an equivalent circuit model to real instruments, which is regarded as the best way. Main objective of this paper is to introduce a program designed to implement a diagnostic and response analysis for an equivalent circuit modeling. The program links a signal analysis tool code to an abnormal signal simulation engine not only as a one body order system, but also as a part of functions of a PC-based ASSA (abnormal signal simulation analysis) module developed to obtain a varying range of the elements in high temperature conditions. As a result, a special function for abnormal signal patterns can be obtained through the program, which in turn makes it possible to analyze the abnormal output signals through a response characteristic of a 4∼20mA circuit model and a range of the elements changing with temperature under an accident condition.
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Varatkar, Girish V., and Naresh R. Shanbhag. "Variation-Tolerant Motion Estimation Architecture." In 2007 IEEE Workshop on Signal Processing Systems. IEEE, 2007. http://dx.doi.org/10.1109/sips.2007.4387531.

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Mitiche, I., G. Morison, A. Nesbitt, M. H. Narborough, P. Boreham, and B. G. Stewart. "An evaluation of total variation signal denoising methods for partial discharge signals." In 2017 INSUCON - 13th International Electrical Insulation Conference (INSUCON). IEEE, 2017. http://dx.doi.org/10.23919/insucon.2017.8097195.

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Thanawattano, Chusak, and Surapol Tan-a-ram. "Cardiac Arrhythmia Detection based on Signal Variation Characteristic." In 2008 International Conference on Biomedical Engineering And Informatics (BMEI). IEEE, 2008. http://dx.doi.org/10.1109/bmei.2008.294.

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Chamoli, Vivek, Rishi Prakash, Anurag Vidyarthi, and Ananya Ray. "Sensitivity of NavIC signal for soil moisture variation." In 2017 International Conference on Emerging Trends in Computing and Communication Technologies (ICETCCT). IEEE, 2017. http://dx.doi.org/10.1109/icetcct.2017.8280318.

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Jyotishi, Debasish, and Samarendra Dandapat. "Person Identification using Spatial Variation of Cardiac Signal." In 2020 IEEE Applied Signal Processing Conference (ASPCON). IEEE, 2020. http://dx.doi.org/10.1109/aspcon49795.2020.9276728.

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Smith, Peter J., Himal A. Suraweera, and Mansoor Shafi. "Signal power variation with applications to cognitive radio." In 2008 Australian Communications Theory Workshop. IEEE, 2008. http://dx.doi.org/10.1109/ausctw.2008.4460818.

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Reports on the topic "Signal variation"

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Panas, R., J. Cuadra, K. Mohan, and R. Morales. Model and Standard Operating Procedures Supporting Signal Variation Flow Graph Analysis. Office of Scientific and Technical Information (OSTI), September 2020. http://dx.doi.org/10.2172/1668519.

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Smith, Jijo K., Howell Li, and Darcy M. Bullock. Populating SAE J2735 Message Confidence Values for Traffic Signal Transitions Along a Signalized Corridor. Purdue University, 2019. http://dx.doi.org/10.5703/1288284317322.

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The communication between connected vehicles and traffic signal controllers is defined in SAE Surface Vehicle Standard J2735. SAE J2735 defines traffic signal status messages and a series of 16 confidence levels for traffic signal transitions. This paper discusses a statistical method for tabulating traffic signal data by phase and time of day and populating the SAE J2735 messages. Graphical representation of the red-green and green-yellow transitions are presented from six intersections along a 4-mile corridor for five different time of day timing plans. The case study provided illustrates the importance of characterizing the stochastic variation of traffic signals to understand locations, phases, and time of day when traffic indications operate with high predictability, and periods when there are large variations in traffic signal change times. Specific cases, such as low vehicle demand and occasional actuation of pedestrian phases are highlighted as situations that may reduce the predictability of traffic signal change intervals. The results from this study also opens up discussion among transportation professionals on the importance of consistent tabulation of confidence values for both beginning and end of green signal states. We believe this paper will initiate dialog on how to consistently tabulate important data elements transmitted in SAE J2735 and perhaps refine those definitions. The paper concludes by highlighting the importance of traffic engineers and connected vehicle developers to work together to develop shared visions on traffic signal change characteristics so that the in-vehicle use cases and human-machine interface (HMI) meet user expectations.
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Onovughe, Elvis. Usage of RC index as a Good Representation for Characterising Rapid Variation Signals in Geomagnetic Field Studiess. Balkan, Black sea and Caspian sea Regional Network for Space Weather Studies, April 2018. http://dx.doi.org/10.31401/sungeo.2018.01.11.

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Day, Christopher M., Hiromal Premachandra, and Darcy M. Bullock. Characterizing the Impacts of Phasing, Environment, and Temporal Factors on Pedestrian Demand at Traffic Signals. Purdue University, 2011. http://dx.doi.org/10.5703/1288284317352.

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There is a need for more and higher quality data on pedestrian demand patterns for a number of applications in planning, transportation engineering, public health, and other areas. It is particularly desirable to better characterize the influence of daily, weekly, and annual variations; the impact of weather and special events; and the effects of changes in pedestrian phasing. This paper proposes and demonstrates a methodology for quantifying the relative demand for pedestrian service at a signalized intersection by using the percent of signal cycles per hour in which the pedestrian phase was actuated. Although this performance measure does not by itself provide a pedestrian count, it can be used as a surrogate to characterize how pedestrian volumes vary due to operating conditions. More importantly, since this technique does not require new sensors, the data can be collected at thousands of intersections across the nation where pedestrian push buttons are in use. This paper documents findings from over a year of data collection at a signalized intersection on a college campus. The effects of daily/weekly/annual variations, special events, weather (temperature and precipitation), seasonal changes in activity patterns, and changes in pedestrian signal phasing are documented. A Tobit model is used to account for the influences of these variables and understand how they co-influence pedestrian activity. The implementation of an exclusive pedestrian phase is associated with a 9% increase in pedestrian phase utilization at the intersection. This change is associated with a decrease in user cost relative to performing midblock crossings. The modeled impact of snowfall events adds further insight by showing that as the user cost of making midblock crossings increases, pedestrian activity at the intersection increases.
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Bohorquez-Penuela, Camilo, and Mariana Urbina-Ramirez. Rising Staple Prices and Food Insecurity: The Case of the Mexican Tortilla. Banco de la República de Colombia, November 2020. http://dx.doi.org/10.32468/be.1144.

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We study the relationship between rising prices of tortillas---the Mexican staple par excellence---and household food insecurity between 2008 and 2014, a period in which global food prices experienced dramatic increases. The use of a unique combination of household-level data and official state-level information on prices allows us exploit signi cant variation in prices across the Mexican states. Since households cannot be tracked across time, we follow Deaton (1985) by constructing a series of pseudo-panels to control for time- invariant unobserved heterogeneity and measurement error. The regression estimates suggest that increasing tortilla prices affected food insecurity rates in Mexico. More speci cally, households with children or those in the second or third income quintile are more likely to be affected.
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Crisosto, Carlos, Susan Lurie, Haya Friedman, Ebenezer Ogundiwin, Cameron Peace, and George Manganaris. Biological Systems Approach to Developing Mealiness-free Peach and Nectarine Fruit. United States Department of Agriculture, 2007. http://dx.doi.org/10.32747/2007.7592650.bard.

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Peach and nectarine production worldwide is increasing; however consumption is flat or declining because of the inconsistent eating quality experienced by consumers. The main factor for this inconsistent quality is mealiness or woolliness, a form of chilling injury that develops following shipping periods in the global fruit market today. Our research groups have devised various postharvest methods to prolong storage life, including controlled atmosphere and delayed storage; however, these treatments only delay mealiness. Mealiness texture results from disruption of the normal ripening process involving disassembly of cell wall material, and creates a soft fruit texture that is dry and grainy instead of juicy and smooth. Solving this problem is a prerequisite for increasing the demand for fresh peach and nectarine. Two approaches were used to reveal genes and their associated biochemical processes that can confer resistance to mealiness or wooliness. At the Volcani Center, Israel, a nectarine cultivar and the peach cultivar (isogenetic materials) from which the nectarine cultivar spontaneously arose, and at the Kearney Agricultural Center of UC Davis, USA, a peach population that segregates for quantitative resistance to mealiness was used for dissecting the genetic components of mealiness development. During our project we have conducted research integrating the information from phenotypic, biochemical and gene expression studies, proposed possible candidate genes and SNPs-QTLs mapping that are involved in reducing peach mealiness susceptibility. Numerous genes related to ethylene biosynthesis and its signal transduction, cell wall structure and metabolism, stress response, different transcription factor families were detected as being differentially accumulated in the cold-treated samples of these sensitive and less sensitive genotypes. The ability to produce ethylene and keep active genes involved in ethylene signaling, GTP-binding protein, EIN-3 binding protein and an ethylene receptor and activation of ethyleneresponsive fruit ripening genes during cold storage provided greater resistance to CI. Interestingly, in the functional category of genes differentially expressed at harvest, less chilling sensitive cultivar had more genes in categories related to antioxidant and heat sock proteins/chaperones that may help fruit to adapt to low temperature stress. The specific objectives of the proposed research were to: characterize the phenotypes and cell wall components of the two resistant systems in response to mealiness- inducing conditions; identify commonalities and specific differences in cell wall proteins and the transcriptome that are associated with low mealiness incidence; integrate the information from phenotypic, biochemical, and gene expression studies to identify candidate genes that are involved in reducing mealiness susceptibility; locate these genes in the Prunus genome; and associate the genes with genomic regions conferring quantitative genetic variation for mealiness resistance. By doing this we will locate genetic markers for mealiness development, essential tools for selection of mealiness resistant peach lines with improved fruit storability and quality. In our research, QTLs have been located in our peach SNPs map, and proposed candidate genes obtained from the integrated result of phenotypic, biochemical and gene expression analysis are being identified in our QTLs as an approach searching for consistent assistant markers for peach breeding programs.
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Mark, Tami L., William N. Dowd, and Carol L. Council. Tracking the Quality of Addiction Treatment Over Time and Across States: Using the Federal Government’s “Signs” of Higher Quality. RTI Press, July 2020. http://dx.doi.org/10.3768/rtipress.2020.rr.0040.2007.

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The objective of this study was to track trends in the signs of higher-quality addiction treatment as defined by the National Institute on Drug Abuse, the National Institute on Alcohol Abuse and Addiction, and the Substance Abuse and Mental Health Services Administration. We analyzed the National Survey of Substance Abuse Treatment Services from 2007 through 2017 to determine the percent of facilities having the characteristics of higher quality. We analyzed the percent by state and over time. • We found improvements between 2007 and 2017 on most measures, but performance on several measures remained low. • Most programs reported providing evidence-based behavioral therapies. • Half or fewer facilities offered medications for opioid use disorder; mental health assessments; testing for hepatitis C, HIV, and sexually transmitted diseases; self-help groups; employment assistance; and transportation assistance. • There was significant state-level variation across the measures.
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García-Mantilla, Daniel. PLAC Network Best Practices Series: Target-Income Design of Incentives, Benchmark Portfolios and Performance Metrics for Pension Funds. Inter-American Development Bank, June 2021. http://dx.doi.org/10.18235/0003599.

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In defined contribution systems, at the end of the accumulation phase the assets in the retirement account are exchanged for a pension. The conversion rate from assets to retirement income (which depends on the level of interest rates) is very volatile, and its variations constitute the main investment risk facing pension fund affiliates. In this sense, performance metrics, management fees and benchmark portfolios that focus on assets (and asset returns) and ignore the variations in the conversion rate, embed several problems: i. they send wrong signals to regulators, fund managers and workers, ii. they provide wrong incentives to pension fund management companies, and iii. they leave pension fund affiliates exposed to their largest risk factor, even during the last few years preceding their retirement date. We find that regulatory incentives with these fundamental problems are ubiquitous in the region. The document presents a series of best practices, and delivers a practical set of tools to assist regulators and supervisors in designing a framework that improves security and sufficiency of retirement income, and provides relevant and timely information to pension fund affiliates. The framework achieves that by fostering an integration of the accumulation and the payout phases, and an alignment of the regulatory incentives for pension fund management companies with the retirement income objectives of pension fund affiliates. Using historical data from Colombia as a case study, the document illustrates and quantifies the improvements in terms of pension benefits and retirement income security that the proposed framework could bring.
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Quinn, Meghan. Geotechnical effects on fiber optic distributed acoustic sensing performance. Engineer Research and Development Center (U.S.), July 2021. http://dx.doi.org/10.21079/11681/41325.

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Distributed Acoustic Sensing (DAS) is a fiber optic sensing system that is used for vibration monitoring. At a minimum, DAS is composed of a fiber optic cable and an optic analyzer called an interrogator. The oil and gas industry has used DAS for over a decade to monitor infrastructure such as pipelines for leaks, and in recent years changes in DAS performance over time have been observed for DAS arrays that are buried in the ground. This dissertation investigates the effect that soil type, soil temperature, soil moisture, time in-situ, and vehicle loading have on DAS performance for fiber optic cables buried in soil. This was accomplished through a field testing program involving two newly installed DAS arrays. For the first installation, a new portion of DAS array was added to an existing DAS array installed a decade prior. The new portion of the DAS array was installed in four different soil types: native fill, sand, gravel, and an excavatable flowable fill. Soil moisture and temperature sensors were buried adjacent to the fiber optic cable to monitor seasonal environmental changes over time. Periodic impact testing was performed at set locations along the DAS array for over one year. A second, temporary DAS array was installed to test the effect of vehicle loading on DAS performance. Signal to Noise Ratio (SNR) of the DAS response was used for all the tests to evaluate the system performance. The results of the impact testing program indicated that the portions of the array in gravel performed more consistently over time. Changes in soil moisture or soil temperature did not appear to affect DAS performance. The results also indicated that time DAS performance does change somewhat over time. Performance variance increased in new portions of array in all material types through time. The SNR in portions of the DAS array in native silty sand material dropped slightly, while the SNR in portions of the array in sand fill and flowable fill material decreased significantly over time. This significant change in performance occurred while testing halted from March 2020 to August 2020 due to the Covid-19 pandemic. These significant changes in performance were observed in the new portion of test bed, while the performance of the prior installation remained consistent. It may be that, after some time in-situ, SNR in a DAS array will reach a steady state. Though it is unfortunate that testing was on pause while changes in DAS performance developed, the observed changes emphasize the potential of DAS to be used for infrastructure change-detection monitoring. In the temporary test bed, increasing vehicle loads were observed to increase DAS performance, although there was considerable variability in the measured SNR. The significant variation in DAS response is likely due to various industrial activities on-site and some disturbance to the array while on-boarding and off-boarding vehicles. The results of this experiment indicated that the presence of load on less than 10% of an array channel length may improve DAS performance. Overall, this dissertation provides guidance that can help inform the civil engineering community with respect to installation design recommendations related to DAS used for infrastructure monitoring.
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Bracewell, Jeff. Shoreline change at Gulf Islands National Seashore, Florida and Mississippi: 2018–2021 data summary. National Park Service, March 2022. http://dx.doi.org/10.36967/nrr-2293103.

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In May and June 2018, and April 2021, the Gulf Coast Network (GULN) surveyed shoreline position at Gulf Islands National Seashore (GUIS) as a part of the NPS Vital Signs Monitoring Program. Monitoring was conducted following methods detailed in Monitoring Shoreline Position at Gulf Coast Network Parks: Protocol Implementation Plan (PIP; Bracewell 2017). Shoreline change was calculated using the Digital Shoreline Analysis System developed by USGS (Theiler et al. 2008). Key findings from this effort are as follows: In Florida, the mean shoreline change rate from 2018 to 2021 was -7.10 meters/year (-23.3 feet[ft]/year) with a standard deviation of 5.01 meters (16.4 ft) with approximately 95% of transects exhibiting landward retreat. In Mississippi, the mean change in island width from 2018 to 2021 was -7.46 meters/year (-24.5 ft/year) with a standard deviation of 12.49 meters (41.0 ft) with approximately 73% of transects exhibiting a loss in width. This project is in the early phases of implementation and will benefit from future surveys to better understand the influence of slight changes in survey timing and other environmental variations.
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