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Journal articles on the topic 'Papoulis'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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1

Ferreira, P. J. S. G. "Interpolation and the discrete Papoulis-Gerchberg algorithm." IEEE Transactions on Signal Processing 42, no. 10 (1994): 2596–606. http://dx.doi.org/10.1109/78.324726.

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2

Jang, Hyo-Sik, Duk-Gyoo Kim, Yoon-Soo Jung, Tae-Gyoun Lee, and Chul-Ho Won. "Super-resolution image enhancement by Papoulis-Gerchbergmethod improvement." Journal of Sensor Science and Technology 19, no. 2 (March 31, 2010): 118–23. http://dx.doi.org/10.5369/jsst.2010.19.2.118.

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3

Salomon, Benjamin G., and Hanoch Ur. "A Method for the Recovery of Gaps in General Analytic Signals." ISRN Signal Processing 2011 (September 7, 2011): 1–6. http://dx.doi.org/10.5402/2011/421502.

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We propose a generalized Papoulis-Gerchberg algorithm for the recovery of gaps in general analytic functions. The continuous-time algorithm is based on signal expansions in terms of the Chebyshev polynomials of the first kind, and the discrete-time implementation is based on a suitable nonuniform sampling scheme and the discrete cosine transform.
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4

Salari, E., and G. Bao. "Super-resolution using an enhanced Papoulis–Gerchberg algorithm." IET Image Processing 6, no. 7 (2012): 959. http://dx.doi.org/10.1049/iet-ipr.2010.0513.

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5

Medina, Juan Miguel, and Bruno Cernuschi-Frias. "On the Papoulis Sampling Theorem: Some General Conditions." IEEE Transactions on Information Theory 64, no. 10 (October 2018): 6722–30. http://dx.doi.org/10.1109/tit.2018.2859320.

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6

Xia, X. G. "Extensions of the Papoulis-Gerchberg Algorithm for Analytic Functions." Journal of Mathematical Analysis and Applications 179, no. 1 (October 1993): 187–202. http://dx.doi.org/10.1006/jmaa.1993.1343.

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7

Brown, J. L., and S. D. Cabrera. "On well-posedness of the Papoulis generalized sampling expansion." IEEE Transactions on Circuits and Systems 38, no. 5 (May 1991): 554–56. http://dx.doi.org/10.1109/31.76494.

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8

Protzmann, Marcus, and Holger Boche. "Ein Konvergenzbeweis für den Algorithmus von Papoulis und Gerchberg." Frequenz 52, no. 9-10 (January 1998): 175–82. http://dx.doi.org/10.1515/freq.1998.52.9-10.175.

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9

Feuer, A. "On the Necessity of Papoulis' Result for Multidimensional GSE." IEEE Signal Processing Letters 11, no. 4 (April 2004): 420–22. http://dx.doi.org/10.1109/lsp.2004.824022.

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10

Fujita, Takeshi, and M. R. McCartney. "Phase recovery for electron holography using Gerchberg–Papoulis iterative algorithm." Ultramicroscopy 102, no. 4 (March 2005): 279–86. http://dx.doi.org/10.1016/j.ultramic.2004.10.009.

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11

Huang, Dongliang, and Henry Leung. "Reconstruction of Drifting Sensor Responses Based on Papoulis–Gerchberg Method." IEEE Sensors Journal 9, no. 5 (May 2009): 595–604. http://dx.doi.org/10.1109/jsen.2009.2016601.

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12

Port, Sidney C. "Probability, Random Variables, and Stochastic Processes—Second Edition (Athanasios Papoulis)." SIAM Review 28, no. 2 (June 1986): 275–76. http://dx.doi.org/10.1137/1028091.

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13

LIU, PAO-LO. "PREDICTION ACCURACY OF BAND-RESTRICTED RANDOM SIGNALS AND SECURITY RISK IN STATISTICAL KEY EXCHANGE." Fluctuation and Noise Letters 09, no. 04 (December 2010): 413–22. http://dx.doi.org/10.1142/s0219477510000344.

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Statistical key exchange relies on signals with irreducible randomness to covertly transmit information. Because of causality, there may be disturbances during the transient turn-on, which can pose as a security risk. Linear prediction and the Gerchberg–Papoulis methods are used to analyze the risk quantitatively. With properly generated signals, the probability of leak during the transient turn-on is found to be comparable to that of the steady state. The transient signal does not pose as an additional security risk.
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14

Kuzucu, Elvan, Dilan Öztürk, Mustafa Gül, Bengisu Özbay, A. Mansur Arisoy, H. Onur Sirin, and Ismail Uyanik. "Enhancing 3D range image measurement density via dynamic Papoulis–Gerchberg algorithm." Transactions of the Institute of Measurement and Control 40, no. 16 (March 5, 2018): 4407–20. http://dx.doi.org/10.1177/0142331218759899.

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As one of the most popular range detection methods, lidar is commonly used in various robotic applications. Although most robotic platforms easily adopt 2D lidar for range sensing, 3D lidar is rarely used in mobile robots, owing to its high cost. Some methods reported in the literature obtain 3D range information by rotating a single 2D lidar device. However, for most of these methods, there is a trade-off between 3D scan frequency and measurement density. Existing methods discussed in the literature for increasing the measurement density in high-frequency lidar have high time complexity and require certain conditions on data distribution. In a previous work, we showed the usability of an image super-resolution method, the Papoulis–Gerchberg (P–G) algorithm, on range data represented in the form of a greyscale image. However, the low convergence rate of the original P–G algorithm impedes its use for online applications. In this study, we advanced the P–G algorithm to drastically reduce the convergence time and improve performance by utilizing previous range images. The proposed algorithm now supports application on a mobile robot with online measurement density enhancement for 3D range images collected by rotating a 2D lidar device around its pitch axis with a high 3D scan frequency. We show illustrative examples for different scenarios to present the effectiveness of the proposed method on a 3D range sensor mounted on a mobile robot.
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15

Maiseli, Baraka. "Diffusion-steered super-resolution method based on the Papoulis–Gerchberg algorithm." IET Image Processing 10, no. 10 (October 1, 2016): 683–92. http://dx.doi.org/10.1049/iet-ipr.2015.0715.

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16

Chatterjee, P., S. Mukherjee, S. Chaudhuri, and G. Seetharaman. "Application Of Papoulis-Gerchberg Method In Image Super-Resolution and Inpainting." Computer Journal 52, no. 1 (February 19, 2008): 80–89. http://dx.doi.org/10.1093/comjnl/bxm050.

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17

Minami, Kei-Ichiroh, Hiroaki Okayama, and Satoshi Kawata. "Super-Dynamic-Range and Super-Quantization Methods for FT-IR Spectra." Applied Spectroscopy 47, no. 4 (April 1993): 441–45. http://dx.doi.org/10.1366/0003702934334903.

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Numerical methods are proposed for expanding the dynamic range and increasing the quantization resolution of Fourier transform infrared spectrum data. In these methods, an interferogram is oversampled at a rate higher than the Nyquist sampling rate. From the oversampled interferogram data, the full-range interferogram or the lost quantization bits are recovered by using the Gerchberg-Papoulis iterative algorithm, incorporating constraints on the amplitude range of the interferogram and on the band limitation and non-negativity of the spectrum. Experimental results for IR absorption spectra of cyclohexene are shown in order to demonstrate the capabilities of the methods.
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18

Shinbori, Eiji, and Mikio Takagi. "High-quality image magnification applying the gerchberg-papoulis iterative algorithm with DCT." Systems and Computers in Japan 25, no. 6 (1994): 80–90. http://dx.doi.org/10.1002/scj.4690250609.

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19

Yan, Hong, and Jintong Mao. "The relation of low frequency restoration methods to the gerchberg-papoulis algorithm." Magnetic Resonance in Medicine 16, no. 1 (October 1990): 166–72. http://dx.doi.org/10.1002/mrm.1910160116.

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20

Stamenkovic, N., N. Stojanovic, D. Jovanovic, and Z. Stankovic. "A Comparison of Papoulis and Chebyshev Filters in the Continuous Time Domain." Radioengineering 30, no. 3 (September 15, 2021): 569–75. http://dx.doi.org/10.13164/re.2021.0569.

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21

Sharma, Kamalesh Kumar, and Shiv Dutt Joshi. "Papoulis-like generalized sampling expansions in fractional Fourier domains and their application to superresolution." Optics Communications 278, no. 1 (October 2007): 52–59. http://dx.doi.org/10.1016/j.optcom.2007.06.022.

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22

Sano, Makoto, Manuel Sierra-Castaner, Tamara Salmeron-Ruiz, Jiro Hirokawa, and Makoto Ando. "Reconstruction of the Field Distribution on Slot Array Antennas Using the Gerchberg–Papoulis Algorithm." IEEE Transactions on Antennas and Propagation 63, no. 8 (August 2015): 3441–51. http://dx.doi.org/10.1109/tap.2015.2434391.

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23

Shemer, A., A. Schwarz, E. Gur, E. Cohen, and Z. Zalevsky. "Image nonlinearity and non-uniformity corrections using Papoulis - Gerchberg algorithm in gamma imaging systems." Journal of Physics: Conference Series 605 (April 28, 2015): 012010. http://dx.doi.org/10.1088/1742-6596/605/1/012010.

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24

Wang, Jin, and Yuanyuan Wang. "An Efficient Compensation Method for Limited-View Photoacoustic Imaging Reconstruction Based on Gerchberg–Papoulis Extrapolation." Applied Sciences 7, no. 5 (May 17, 2017): 505. http://dx.doi.org/10.3390/app7050505.

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25

Bazulin, E. G. "Eliminating saturation-type distortions in ultrasonic signals by the least-squares and Papoulis–Gerchberg algorithms." Russian Journal of Nondestructive Testing 53, no. 10 (October 2017): 686–99. http://dx.doi.org/10.1134/s1061830917100023.

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26

Li, Xi, Tongyang Zhang, Minggeng Wei, and Lin Yang. "Reduction of Truncation Errors in Planar Near-Field Antenna Measurements Using Improved Gerchberg–Papoulis Algorithm." IEEE Transactions on Instrumentation and Measurement 69, no. 9 (September 2020): 5972–74. http://dx.doi.org/10.1109/tim.2020.3011588.

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27

Martini, E., O. Breinbjerg, and S. Maci. "Reduction of Truncation Errors in Planar Near-Field Aperture Antenna Measurements Using the Gerchberg-Papoulis Algorithm." IEEE Transactions on Antennas and Propagation 56, no. 11 (November 2008): 3485–93. http://dx.doi.org/10.1109/tap.2008.2005442.

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28

Jai Krishna Gautam, A. Kumar, and R. Saxena. "Corrections to and comments on "Minimum-bias windows for high-resolution spectral estimates" by Athanasios Papoulis." IEEE Transactions on Information Theory 42, no. 3 (May 1996): 1001. http://dx.doi.org/10.1109/18.490564.

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29

Sánchez, D., M. Baquero, D. González, and E. Alfonso. "Improvement of resolution in equivalent currents reconstruction using Papoulis-Gerchberg algorithm and replicas of the spectrum." Electronics Letters 43, no. 19 (2007): 1010. http://dx.doi.org/10.1049/el:20070368.

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30

KUKLINSKI, WALTER S. "UTILIZATION OF FRACTAL IMAGE MODELS IN MEDICAL IMAGE PROCESSING." Fractals 02, no. 03 (September 1994): 363–69. http://dx.doi.org/10.1142/s0218348x94000454.

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One of the more successful engineering applications of fractal geometry has been the utilization of fractal image models in medical image processing. These applications have included tissue characterization studies, textural image segmentation, and image restoration using fractal constraints. The class of fractal models used in medical image processing and the techniques used to estimate the fractal dimension associated with these models will be reviewed. An image segmentation algorithm that utilized a fractal textural feature and formulated the segmentation process as a configurational optimization problem is presented. The configurational optimization method allows information about both, the degree of correspondence between a candidate segment and an assumed textural model, and morphological information about the candidate segment to be used in the segmentation process. To apply this configurational optimization technique with a fractal textural model however, requires the estimation of the fractal dimension of an irregularly shaped candidate segment. The potential utility of a discrete Gerchberg-Papoulis bandlimited extrapolation algorithm to the estimation of the fractal dimension of an irregularly shaped candidate segment is also discussed.
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31

Cano-Fácila, Francisco José, Sergey Pivnenko, and Manuel Sierra-Castañer. "Reduction of Truncation Errors in Planar, Cylindrical, and Partial Spherical Near-Field Antenna Measurements." International Journal of Antennas and Propagation 2012 (2012): 1–19. http://dx.doi.org/10.1155/2012/438727.

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A method to reduce truncation errors in near-field antenna measurements is presented. The method is based on the Gerchberg-Papoulis iterative algorithm used to extrapolate band-limited functions and it is able to extend the valid region of the calculated far-field pattern up to the whole forward hemisphere. The extension of the valid region is achieved by the iterative application of a transformation between two different domains. After each transformation, a filtering process that is based on known information at each domain is applied. The first domain is the spectral domain in which the plane wave spectrum (PWS) is reliable only within a known region. The second domain is the field distribution over the antenna under test (AUT) plane in which the desired field is assumed to be concentrated on the antenna aperture. The method can be applied to any scanning geometry, but in this paper, only the planar, cylindrical, and partial spherical near-field measurements are considered. Several simulation and measurement examples are presented to verify the effectiveness of the method.
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32

Lasaygues, P., J. P. Lefebvre, and S. Mensah. "High Resolution Low Frequency Ultrasonic Tomography." Ultrasonic Imaging 19, no. 4 (October 1997): 278–93. http://dx.doi.org/10.1177/016173469701900404.

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Ultrasonic reflection tomography results from a linearization of the inverse acoustic scattering problem, named the inverse Born approximation. The goal of ultrasonic reflection tomography is to obtain reflectivity images from backscattered measurements. This is a Fourier synthesis problem and the first step is to correctly cover the frequency space of the object. For this inverse problem, we use the classical algorithm of tomographic reconstruction by summation of filtered backprojections. In practice, only a limited number of views are available with our mechanical rig, typically 180, and the frequency bandwidth of the pulses is very limited, typically one octave. The resolving power of the system is then limited by the bandwidth of the pulse. Low and high frequencies can be restored by use of a deconvolution algorithm that enhances resolution. We used a deconvolution technique based on the Papoulis method. The advantage of this technique is conservation of the overall frequency information content of the signals. The enhancement procedure was tested by imaging a square aluminium rod with a cross-section less than the wavelength. In this application, the central frequency of the transducer was 250 kHz so that the central wavelength was 6 mm whereas the cross-section of the rod was 4 mm. Although the Born approximation was not theoretically valid in this case (high contrast), a good reconstruction was obtained.
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33

De Juan Pérez, Alba, and María del Mar Seguí Crespo. "Revisión sistemática y metaanálisis sobre la prevalencia de depresión, ansiedad e insomnio en trabajadores sanitarios durante la pandemia de COVID-19." Archivos de Prevención de Riesgos Laborales 24, no. 3 (July 14, 2021): 310–15. http://dx.doi.org/10.12961/aprl.2021.24.03.08.

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Este trabajo es un comentario del artículo: Pappa S, Ntella V, Giannakas T, Giannakoulis VG, Papoutsi E, Katsaounou P. Prevalence of depression, anxiety, and insomnia among healthcare workers during the COVID-19 pandemic: A systematic review and meta-analysis. Brain Behav Immun. 2020 Aug;88:901-907. doi: 10.1016/j.bbi.2020.05.026.
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34

Cordier, Laurent. "Saint-Papoul (Aude). Abbaye." Archéologie médiévale, no. 44 (December 1, 2014): 242–43. http://dx.doi.org/10.4000/archeomed.9244.

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35

De Visscher, Héloïse. "Papouin, Gaboux, Séguins : rencontre au sommet." Les cahiers internationaux de psychologie sociale Numéro 84, no. 4 (2009): 157. http://dx.doi.org/10.3917/cips.084.0157.

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36

Leblic, Isabelle. "Papous d’Éric Lafforgue et Almut Schneider." Journal de la société des océanistes, no. 126-127 (December 15, 2008): 335–36. http://dx.doi.org/10.4000/jso.1972.

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37

Stelzer, Joachim, Lech Longa, and Hans-Rainer Trebin. "Rapini-Papoular Constants in a Model Nematic Liquid Crystal." Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals 304, no. 1 (September 1997): 259–63. http://dx.doi.org/10.1080/10587259708046969.

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38

BARBERO, G., A. N. CHUVYROV, and A. P. KREKHOV. "INFLUENCE OF THE FLOW ON THE ORIENTATION INDUCED BY A SOLID SUBSTRATE ON A NEMATIC LIQUID CRYSTAL." International Journal of Modern Physics B 06, no. 03n04 (February 1992): 437–48. http://dx.doi.org/10.1142/s0217979292000232.

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The influence of the flow on the orientation induced by a solid substrate on a nematic liquid crystal is experimentally and theoretically analyzed. Our experimental data show that a nematic cell filled by capillarity presents a birefringence dependent on the sample thickness. This fact suggests that the symmetry of the problem is broken by the filling process. A simple model is presented in order to explain the experimental observations. According to this model, a surface anchoring contribution to the total surface energy, of the same order of the usual one appearing in the Rapini-Papoular expression, is connected to the flow. The agreement between the experimental data and the theoretical results is fairly good.
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39

Grimberg, Halyna. "As tranças da chalá." Arquivo Maaravi: Revista Digital de Estudos Judaicos da UFMG 1, no. 1 (October 30, 2007): 207–8. http://dx.doi.org/10.17851/1982-3053.1.1.207-208.

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Chalá é o que meu pai melhor fazia. O pão trançado, a massa leve em vaga doçura e uma pitada de sal, polvilhado com sementes de papoula. O forno era lento e antiquado na casa de Madureira. Fogão de má qualidade, barato e de segunda mão, herdado do irmão morto. Meu tio Luís faleceria três dias após nossa chegada ao Brasil, a convite seu. Era solteiro, iria morrendo de câncer, e a herança se perderia. Pouca coisa, mas era preciso deixar algo para alguém. A transmissão perpetuada, o fluxo de vida para além de cada um, para além dele, mísero e solitário judeu perdido nos trópicos.
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40

Alexe-Ionescu, A. L., G. Barbero, Z. Gabbasova, G. Sayko, and A. K. Zvezdin. "Stochastic contribution to the anchoring energy: Deviation from the Rapini-Papoular expression." Physical Review E 49, no. 6 (June 1, 1994): 5354–58. http://dx.doi.org/10.1103/physreve.49.5354.

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41

Papoular, R. "Classification of C-Rich Stars According to Their Mid-IR Signatures." International Astronomical Union Colloquium 106 (1989): 54. http://dx.doi.org/10.1017/s0252921100062631.

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The spectra of the IRAS low-resolution-spectrometer in tape form have been submitted to a systematic morphological analysis, using classical quantitative discriminants (O.Gal et al. 1987, A & A 183, 29; Y. Baron et al. 1987, A & A 186, 271; R. Papoular 1988, A & A , in press). Spectra which display the 11.5μ feature of SiC fall into 4 classes of average spectral excesses. They differ by the width of the SiC feature and by the presence or absence of secondary features at ~8.6, ~11.7 and ~12.8μm.A majority of these spectra have a lower 12-25μm colour temperature than do most optically selected C-stars, presumably because of thicker dust envelopes. While most spectra belong to LRS class 4n, 20% of the total were found among the brightest 20% of the much larger class In, suggesting that the relative abundance of C-stars is much higher than previously assumed.
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42

Zou, Roger, and Frank Collins. "Which Rust Deposition Model Should Be Used in Predicting Concrete Cover Cracking due to Reinforcement Corrosion?" Advanced Materials Research 468-471 (February 2012): 1000–1004. http://dx.doi.org/10.4028/www.scientific.net/amr.468-471.1000.

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The critical amount of corroded steel that causes concrete cover cracking can be readily calculated based on thick-walled cylinder theory. However, the results may vary significantly depending on how the rust deposition is considered. There are several rust deposition hypothesis proposed in the literature for modelling concrete cover cracking of RC structures due to reinforcement corrosion. Among them, three are considered representative ones and have been widely cited in the literature. They are: (i) assumes a certain amount of rust product carried away from the rust layer and deposited within the open cracks proposed by Pantazopoulou and Papoulia; (ii) assumes all of the rust products build up around the bar and all of them are responsible for the expansive pressure proposed by Bazant; (iii) assumes certain amount of rust products deposited into a porous zone around the bar/concrete interface proposed by Liu and Weyers. In this paper, all three rust deposition hypotheses were examined for the critical amount of corrosion to induce cover cracking. When compared to the test data available from the literature, it showed that the porous zone model proposed by Liu and Weyers gives the best predictions. Thus it may be concluded that assuming a porous zone around the steel/concrete interface would be reasonable and may be adopted in developing concrete cover cracking predictive model.
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43

Hervet, Sophie. "Deux nouvelles tortues de l'Éocène inférieur de Saint-Papoul (Aude, France)." Comptes Rendus Palevol 2, no. 8 (December 2003): 617–24. http://dx.doi.org/10.1016/j.crpv.2003.08.002.

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44

Ruano, Elizabeth, and Ana Lúcia Valente. "Política pública e cultivos ilícitos na Colômbia." Revista de Economia e Sociologia Rural 49, no. 1 (March 2011): 109–28. http://dx.doi.org/10.1590/s0103-20032011000100005.

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Objetivou-se buscar respostas para diferentes questões associadas ao fenômeno que vincula agricultores familiares com o plantio da papoula. Dentre as quais, saber se a racionalidade imposta mediante a estratégia de desenvolvimento da política de luta contra as drogas ilícitas é compatível com a dinâmica do problema e por que as estratégias dessa política são mantidas mesmo quando seu fracasso é evidente. Tomou-se como método a realização de um estudo de caso sobre o município de Silvia, Departamento de Cauca, sul da Colômbia. Por tratar-se de uma problemática que não se reduz simplesmente à legalidade ou à renda, apresenta-se uma reflexão que retoma os conflitos, a heterogeneidade e as similitudes manifestas nos territórios rurais latino-americanos, no contexto do capitalismo contemporâneo. Constatou-se que o fracasso verificado da política em questão evidencia o descompasso entre a racionalidade da política e a dinâmica dos territórios alvo.
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45

Barbero, G., and G. Durand. "On the validity of the Rapini-Papoular surface anchoring energy form in nematic liquid crystals." Journal de Physique 47, no. 12 (1986): 2129–34. http://dx.doi.org/10.1051/jphys:0198600470120212900.

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46

Oswald, Patrick. "Comment on the Determination of the Polar Anchoring Energy by Capacitance Measurements in Nematic Liquid Crystals." Applied Sciences 11, no. 16 (August 11, 2021): 7387. http://dx.doi.org/10.3390/app11167387.

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Capacitance measurements have been extensively used to measure the anchoring extrapolation length L at a nematic–substrate interface. These measurements are extremely delicate because the value found for L often critically depends on the sample thickness and the voltage range chosen to perform the measurements. Several reasons have been proposed to explain this observation, such as the presence of inhomogeneities in the director distribution on the bounding plates or the variation with the electric field of the dielectric constants. In this paper, I propose a new method to measure L that takes into account this second effect. This method is more general than the one proposed in Murauski et al. Phys. Rev. E 71, 061707 (2005) because it does not assume that the anchoring angle is small and that the anchoring energy is of the Rapini–Papoular form. This method is applied to a cell of 8CB that is treated for planar unidirectional anchoring by photoalignment with the azobenzene dye Brilliant Yellow. The role of flexoelectric effects and the shape of the anchoring potential are discussed.
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47

Brunois, Florence. "Comment apprendre à dialoguer avec les « natures » papoues : aperçu de la contribution scientifique dePeter Dwyer." Journal de la société des océanistes, no. 120-121 (December 1, 2005): 5–9. http://dx.doi.org/10.4000/jso.301.

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48

Barbero, G., Z. Gabbasova, and Yu A. Kosevich. "On a generalization of the Rapini-Papoular expression of the surface free energy for nematic liquid crystals." Journal de Physique II 1, no. 12 (December 1991): 1505–13. http://dx.doi.org/10.1051/jp2:1991103.

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49

Marandet, Marie-Claude. "L'habitat isolé dans le diocèse de Saint-Papoul à la fin du Moyen Age." Archéologie du Midi médiéval 14, no. 1 (1996): 141–57. http://dx.doi.org/10.3406/amime.1996.1299.

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50

Garcia, Maria Fernanda Mosquera. "Gonzales, Roberto G., Nando Sigona, Martha C. Franco, and Anna Papoutsi, Undocumented Migration: Borders, Immigration Enforcement, and Belonging." Canadian Journal of Sociology 45, no. 2 (June 25, 2020): 195–200. http://dx.doi.org/10.29173/cjs29684.

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