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Journal articles on the topic 'Cauchy distribution (PDF)'

Author: Grafiati

Published: 4 June 2021

Last updated: 8 February 2022

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1

Zhao, Ping, Xingyu Zhao, and Chun Zhao. "Image Denoising Based on Bivariate Distribution." Symmetry 12, no. 11 (2020): 1909. http://dx.doi.org/10.3390/sym12111909.

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The literature has shown that the performance of the de-noising algorithm was greatly influenced by the dependencies between wavelet coefficients. In this paper, the bivariate probability density function (PDF) was proposed which was symmetric, and the dependencies between the coefficients were considered. The bivariate Cauchy distribution and the bivariate Student’s distribution are special cases of the proposed bivariate PDF. One of the parameters in the probability density function gave the estimation method, and the other parameter can take any real number greater than 2. The algorithm ado

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2

Guia Rosa, Igor Da, Marco Antonio Cavalcanti Garcia, and Marcio Nogueira De Souza. "Investigation of probability density functions in modeling sample distribution of surface electromyographic (sEMG) signals." Archives of Control Sciences 23, no. 4 (2013): 381–93. http://dx.doi.org/10.2478/acsc-2013-0023.

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Abstract The surface electromyography signal (sEMG) has been typically modeled as a Gaussian random process. However, some authors have reported that the probability density functions (pdfs) associated with the sample distribution of sEMG signal exhibits a more peaked shape than one could expected for a Gaussian pdf. This work aimed to reinvestigate the profile of the sEMG pdfs during five different load levels of isometric contractions of biceps brachii muscle, and compared the adequacy of four different pdfs (Gaussian, Logistic, Cauchy, and Laplacian) in describing the sample distribution of

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Rice, J. C. "Forecasting Abundance from Habitat Measures Using Nonparametric Density Estimation Methods." Canadian Journal of Fisheries and Aquatic Sciences 50, no. 8 (1993): 1690–98. http://dx.doi.org/10.1139/f93-190.

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The relationships between abundance of animals and characteristics of habitats are important for theoretical and management reasons. However, data on populations and habitats frequently are unsuitable for model-based statistical analyses. The shape of the functional relation between abundance and habitat and the form of the error distribution are rarely known accurately, and noise in the data often is large relative to the signal. Kernel estimators, a type of nonparametric probability density estimation technique, can use available data to estimate the probability density function (pdf) of abu

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Kim, Kyong-Il, Soon-Ic Bahng, and Ryong-Nam Choe. "Despeckling method of ultrasound images using closed-form shrinkage function based on cauchy distribution in wavelet domain." International Journal of Wavelets, Multiresolution and Information Processing 18, no. 04 (2020): 2050026. http://dx.doi.org/10.1142/s0219691320500265.

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Speckle suppression and elimination are very important to improve the visual quality of ultrasound image and the diagnostic ability of the diseases. An effective technique of image denoising based on discrete wavelet transform is to employ a Bayesian maximum a posteriori (MAP) estimator. To suppress and remove the speckle noise using MAP estimator effectively, it must assign correctly the shrinkage function based on appropriate probability density functions (PDFs) for the wavelet coefficients of logarithmically transformed noise-free ultrasound image and speckle noise. In this paper, we introd

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Tilles, Paulo F. C., Sergei V. Petrovskii, and Paulo L. Natti. "A random walk description of individual animal movement accounting for periods of rest." Royal Society Open Science 3, no. 11 (2016): 160566. http://dx.doi.org/10.1098/rsos.160566.

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Animals do not move all the time but alternate the period of actual movement (foraging) with periods of rest (e.g. eating or sleeping). Although the existence of rest times is widely acknowledged in the literature and has even become a focus of increased attention recently, the theoretical approaches to describe animal movement by calculating the dispersal kernel and/or the mean squared displacement (MSD) rarely take rests into account. In this study, we aim to bridge this gap. We consider a composite stochastic process where the periods of active dispersal or ‘bouts’ (described by a certain b

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Golpîra, Hêriș, Salah Bahramara, Syed Abdul Rehman Khan, and Yu Zhang. "Robust bi-level risk-based optimal scheduling of microgrid operation against uncertainty." RAIRO - Operations Research 54, no. 4 (2020): 993–1012. http://dx.doi.org/10.1051/ro/2019046.

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The model introduced in this paper is the first to propose a decentralized robust optimal scheduling of MG operation under uncertainty and risk. The power trading of the MG with the main grid is the first stage variable and power generation of DGs and power charging/discharging of the battery are the second stage variables. The uncertain term of the initial objective function is transformed into a constraint using robust optimization approach. Addressing the Decision Maker’s (DMs) risk aversion level through Conditional Value at Risk (CVaR) leads to a bi-level programming problem using a data-

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7

Szabłowski, Paweł J. "On the generalized Kesten–McKay distributions." ESAIM: Probability and Statistics 24 (2020): 56–68. http://dx.doi.org/10.1051/ps/2019029.

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We examine the properties of distributions with the density of the form: [see formula in PDF] where c, a1, …, an are some parameters and An a suitable constant. We find general forms of An, of k-th moment and of k-th polynomial orthogonal with respect to such measures. We also calculate Cauchy transforms of these measures. We indicate connections of such distributions with distributions and polynomials forming the so called Askey–Wilson scheme. On the way we prove several identities concerning rational symmetric functions. Finally, we consider the case of parameters a1, …, an forming conjugate

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8

Rudstam, Lars G., Clarence S. Clay, and John J. Magnuson. "Density and Size Estimates of Cisco (Coregonus artedii) Using Analysis of Echo Peak PDF from a Single-Transducer Sonar." Canadian Journal of Fisheries and Aquatic Sciences 44, no. 4 (1987): 811–21. http://dx.doi.org/10.1139/f87-099.

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We estimated size and density of fish in three Wisconsin lakes from echo peak probability density functions (PDFs) obtained at night with a single-transducer 70-kHz echosounder. At night, cisco (Coregonus artedii) dominated the pelagic zone in all three lakes. The beam pattern effect was removed with a deconvolving filter technique. Fish size was estimated by fitting a combination of Rice PDFs to the deconvolved fish scattering PDF. Vertical density profiles and size estimates obtained acoustically corresponded to distributions and lengths of fish caught in vertical gill nets. The proportion o

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9

Ashida, H., Y. Okochi, S. Ohshimo, et al. "Differences in the reproductive traits of Pacific bluefin tuna Thunnus orientalis among three fishing grounds in the Sea of Japan." Marine Ecology Progress Series 662 (March 18, 2021): 125–38. http://dx.doi.org/10.3354/meps13625.

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Differences in the reproductive traits of Pacific bluefin tuna Thunnus orientalis (PBF) in the Sea of Japan (SOJ) were investigated to evaluate the reproductive potential in 3 fishing grounds (i.e. northern, central and southern areas). The size distribution of PBF differed among the fishing grounds, with smaller fish (100-130 cm in fork length, FL) being caught in the central and northern areas of the SOJ. Spawning-capable females were found at sea surface temperatures (SSTs) between 17 and 25°C, with most SSTs >21°C. Seasonal changes in SST differed among the fishing grounds, and the peri

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M. Sana, Ahmed, Amer T. Saeed, and Yaseen Kh. Yaseen. "Investigation on the PAPR performance of odd-bit QAM constellations for DFT spread OFDM systems." Indonesian Journal of Electrical Engineering and Computer Science 21, no. 2 (2021): 1005. http://dx.doi.org/10.11591/ijeecs.v21.i2.pp1005-1013.

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<p>Adaptive quadrature amplitude modulation (QAM) is a crucial scheme that enables the modern communication systems to overcome the adverse effects of channel fluctuations and maintain an acceptable spectral efficiency. In order to enhance adaptive modulation even further, adoption of odd-bit QAM constellations alongside even constellations had been suggested to improve the transmission efficiency of adaptive QAM modulation. Hence, odd-bit QAM had been extensively studied, analyzed, and tested by many researchers for various patterns, sizes, and communication systems in terms of bit erro

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Sparrevohn, Claus R., Anders Nielsen, and Josianne G. Støttrup. "Diffusion of fish from a single release point." Canadian Journal of Fisheries and Aquatic Sciences 59, no. 5 (2002): 844–53. http://dx.doi.org/10.1139/f02-059.

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In a field experiment, 3529 turbot (Psetta maxima) were released in order to estimate and describe the movements of hatchery-reared fish by applying diffusion theory. After liberation, the development of the population density was estimated during the following 9 days, and from that, the rate of diffusion and the advection were determined. Two approaches were followed to describe the data: a normal distribution approximation (NDA) model and a partial differential equation (PDE) model. In the latter, it was possible to include the effect of sampling. The two models gave similar results, indicat

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12

Chen, Zhifen, та Xiaopeng Chen. "Maximum likelihood estimation for symmetric α-stable Ornstein–Uhlenbeck processes". Stochastics and Dynamics, 30 липня 2020, 2150018. http://dx.doi.org/10.1142/s0219493721500180.

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In this paper, we consider the maximum likelihood estimation for the symmetric [Formula: see text]-stable Ornstein–Uhlenbeck (S[Formula: see text]S-OU) processes based on discrete observations. Since the closed-form expression of maximum likelihood function is hard to obtain in the Lévy case, we choose a mixture of Cauchy and Gaussian distribution to approximate the probability density function (PDF) of the S[Formula: see text]S distribution. By means of transition function and Laplace transform, we construct an explicit approximate sequence of likelihood function, which converges to the likel

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Xi, Yijun, Xingyao Yin, Xiaojing Liu, Deyong Feng, and Hongmei Li. "Amplitude variation with offset inversion based on group sparse regularization." Interpretation, July 2, 2021, 1–64. http://dx.doi.org/10.1190/int-2019-0132.1.

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Seismic amplitude variation with offset (AVO) inversion from pre-stack seismic data plays a significant role in estimating the elastic parameters and characterizing reservoir properties. Generally, sparse regularization is widely used to solve ill-posed inverse problems by reducing the solution space of subsurface parameters, which makes seismic AVO inversion more stable. However, the traditional sparse constraint inversion only focuses on the vector sparsity of reflectivity, instead of the structural sparse characteristics of estimated parameters. Consequently, various elastic parameters demo

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14

Black, Roderick D., and Paul Dodsworth. "The palynology of the Kimmeridge Clay and Carstone formations (Upper Jurassic – Lower Cretaceous) at Middlegate Quarry, North Lincolnshire, UK, and its biostratigraphical and palaeoenvironmental significance." Proceedings of the Yorkshire Geological Society, August 17, 2021, pygs2021–005. http://dx.doi.org/10.1144/pygs2021-005.

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At Middlegate Quarry, the Carstone Formation is an approximately 0.8 m thick unit of oolitic ferruginous sandstone. It rests unconformably on the lower Kimmeridge Clay Formation (KCF) and is overlain by the Hunstanton Formation (Red Chalk) with an apparently gradational junction. Marine dinoflagellate cysts (dinocysts) are present at a concentration of 9,520 to 13,600 specimens per gramme in the 0.15 m of KCF below the unconformity, and include taxa that confirm ammonite evidence for the intra-Lower Kimmeridgian Substage (Upper Jurassic, Cymodoce Ammonite Zone). A rich recovery of well-preserv

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15

Jaaniste, Luke Oliver. "The Ambience of Ambience." M/C Journal 13, no. 2 (2010). http://dx.doi.org/10.5204/mcj.238.

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Well, you couldn't control the situation to that extent. The world just comes in on top of you. It creeps under the door. It falls out of the sky. It's all around. (Leunig) Like the world that cartoonist Michael Leunig describes, ambience is all around. Everywhere you go. You cannot get away from it. You cannot hide from it. You cannot be without it. For ambience is that which surrounds us, that which pervades. Always-on. Always by-your-side. Always already. Here, there and everywhere. Super-surround-sound. Immersive. Networked and cloudy. Ubiquitous. Although you cannot avoid ambience, you ma

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Nielsen, Hanne E. F., Chloe Lucas, and Elizabeth Leane. "Rethinking Tasmania’s Regionality from an Antarctic Perspective: Flipping the Map." M/C Journal 22, no. 3 (2019). http://dx.doi.org/10.5204/mcj.1528.

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IntroductionTasmania hangs from the map of Australia like a drop in freefall from the substance of the mainland. Often the whole state is mislaid from Australian maps and logos (Reddit). Tasmania has, at least since federation, been considered peripheral—a region seen as isolated, a ‘problem’ economically, politically, and culturally. However, Tasmania not only cleaves to the ‘north island’ of Australia but is also subject to the gravitational pull of an even greater land mass—Antarctica. In this article, we upturn the political conventions of map-making that place both Antarctica and Tasmania

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17

Mole, Tom. "Hypertrophic Celebrity." M/C Journal 7, no. 5 (2004). http://dx.doi.org/10.5204/mcj.2424.

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Critics are always trying to catch up with the phenomena they analyse, and critics of celebrity culture are no different. For most of its history, the celebrity apparatus has had a vested interest in staying invisible. So long as it remained illegible to cultural analysis, it could claim to be simply a transparent medium for exhibiting star quality. The celebrity’s public profile could appear to be the well-earned result of talent and determination, or the seemingly magical crystallization of his or her personality. But recently, some of the mechanics of celebrity culture have gained their own

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18

Humphry, Justine, and César Albarrán Torres. "A Tap on the Shoulder: The Disciplinary Techniques and Logics of Anti-Pokie Apps." M/C Journal 18, no. 2 (2015). http://dx.doi.org/10.5204/mcj.962.

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In this paper we explore the rise of anti-gambling apps in the context of the massive expansion of gambling in new spheres of life (online and offline) and an acceleration in strategies of anticipatory and individualised management of harm caused by gambling. These apps, and the techniques and forms of labour they demand, are examples of and a mechanism through which a mode of governance premised on ‘self-care’ and ‘self-control’ is articulated and put into practice. To support this argument, we explore two government initiatives in the Australian context. Quit Pokies, a mobile app project bet

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Howarth, Anita. "Food Banks: A Lens on the Hungry Body." M/C Journal 19, no. 1 (2016). http://dx.doi.org/10.5204/mcj.1072.

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IntroductionIn Britain, hunger is often hidden in the privacy of the home. Yet otherwise private hunger is currently being rendered public and visible in the growing queues at charity-run food banks, where emergency food parcels are distributed directly to those who cannot afford to feed themselves or their families adequately (Downing et al.; Caplan). Food banks, in providing emergency relief to those in need, are responses to crisis moments, actualised through an embodied feeling of hunger that cannot be alleviated. The growing queues at food banks not only render hidden hunger visible, but

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Molnar, Tamas. "Spectre of the Past, Vision of the Future – Ritual, Reflexivity and the Hope for Renewal in Yann Arthus-Bertrand’s Climate Change Communication Film "Home"." M/C Journal 15, no. 3 (2012). http://dx.doi.org/10.5204/mcj.496.

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About half way through Yann Arthus-Bertrand’s film Home (2009) the narrator describes the fall of the Rapa Nui, the indigenous people of the Easter Islands. The narrator posits that the Rapa Nui culture collapsed due to extensive environmental degradation brought about by large-scale deforestation. The Rapa Nui cut down their massive native forests to clear spaces for agriculture, to heat their dwellings, to build canoes and, most importantly, to move their enormous rock sculptures—the Moai. The disappearance of their forests led to island-wide soil erosion and the gradual disappearance of ara

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