3,286 results
Search Results
2. A New Metric for Multithreaded Parallel Programs Overhead Time Prediction
- Author
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Niculescu, Virginia, Şerban, Camelia, Vescan, Andreea, Filipe, Joaquim, Editorial Board Member, Ghosh, Ashish, Editorial Board Member, Prates, Raquel Oliveira, Editorial Board Member, Zhou, Lizhu, Editorial Board Member, Kaindl, Hermann, editor, Mannion, Mike, editor, and Maciaszek, Leszek A., editor
- Published
- 2023
- Full Text
- View/download PDF
3. Comparing Key Rank Estimation Methods
- Author
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Young, Rebecca, Mather, Luke, Oswald, Elisabeth, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Buhan, Ileana, editor, and Schneider, Tobias, editor
- Published
- 2023
- Full Text
- View/download PDF
4. Estimation of Daily Direct Solar Radiation for Rabat
- Author
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Benchrifa, Mohammed, Essalhi, Hajar, Tadili, Rachid, Nfaoui, Hassan, and Sayigh, Ali, Series Editor
- Published
- 2022
- Full Text
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5. Sustainable Trip Planner Enriched by Trip Reliability
- Author
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Dinko, Alise, Yatskiv, Irina, Budilovich, Evelina, Kacprzyk, Janusz, Series Editor, Gomide, Fernando, Advisory Editor, Kaynak, Okyay, Advisory Editor, Liu, Derong, Advisory Editor, Pedrycz, Witold, Advisory Editor, Polycarpou, Marios M., Advisory Editor, Rudas, Imre J., Advisory Editor, Wang, Jun, Advisory Editor, Kabashkin, Igor, editor, Yatskiv, Irina, editor, and Prentkovskis, Olegas, editor
- Published
- 2022
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6. Measuring Abundance: Methods for the Estimation of Population Size and Species Richness. Data in the Wild Series. By Graham J. G. Upton. Exeter (United Kingdom): Pelagic Publishing. $97.13 (hardcover); $45.33 (paper). x + 226 p.; ill.; index of examples and general index. ISBN: 978-1-78427-232-6 (hc); 978-1-78427-231-9 (pb); 978-1-78427-233-3 (eb). 2020
- Author
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Jo A. Werba
- Subjects
Estimation ,Series (stratigraphy) ,Index (economics) ,Geography ,Abundance (ecology) ,Ecology ,Population size ,Pelagic zone ,Species richness ,General Agricultural and Biological Sciences - Published
- 2021
7. Schiff Base Modified Paper Test Strips for Naked Eye Detection of Copper Ions in Mixed Aqueous Media.
- Author
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Sidana, Nancy, Kaur, Harminder, and Devi, Pooja
- Abstract
A multi responsive Schiff base sensor L with thiophenol moiety was synthesized by the single-step condensation method. The structural analysis of the sensor was proposed by 1H-NMR, UV- Visible absorption, HRMS and FT-IR spectroscopy. Sensor L exhibited an instant appearance of yellow color on the addition of copper ions. Since copper gave an intense color change, therefore detailed studies were performed for copper sensing w.r.t. designed sensor L. Selectivity and sensitivity of sensor concerning copper metal ions were established by performing various UV-Visible spectroscopic and colorimetric studies. The 1:1 binding framework of the L-Cu2+ complex is confirmed by Job’s Plot and further supported by DFT studies. With the help of Benesi-Hildebrand equation, the detection limit and the association constants were found to be $3.15 \times 10^{-6}$ M and $1.16 \times 10^{4}$ M−1, respectively. In addition, sensor L was transferred onto solid substrates including silica and paper strips for establishing its utility in the onsite detection of copper ions. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
8. An innovation-based actuator/surface fault detection, isolation and filter tuning
- Author
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Hajiyev, Chingiz
- Published
- 2023
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9. Estimation of the global number of vapers: 82 million worldwide in 2021
- Author
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Jerzyński, Tomasz and Stimson, Gerry V.
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- 2023
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10. Improved particle filter-based estimation of a quadrotor subjected to uncertainties
- Author
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Kaba, Aziz and Ermeydan, Ahmet
- Published
- 2022
- Full Text
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11. Factors influencing the level of accuracy and compromise in overhead estimation for construction projects in India: an exploratory investigation
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Singla, Harish Kumar and Sridharan, Srividhya
- Published
- 2022
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12. An empirical investigation into intelligent cost analysis in purchasing
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Bodendorf, Frank, Lutz, Manuel, Michelberger, Stefan, and Franke, Joerg
- Published
- 2022
- Full Text
- View/download PDF
13. Raising the bar (18).
- Author
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Elhorst, Paul, Abreu, Maria, Amaral, Pedro, Bhattacharjee, Arnab, Chasco, Coro, Corrado, Luisa, Ditzen, Jan, Doran, Justin, Felsenstein, Daniel, Fuerst, Franz, Le Gallo, Julie, McCann, Philip, Monastiriotis, Vassilis, Quatraro, Francesco, Temursho, Umed, and Yu, Jihai
- Subjects
PURCHASING power parity ,AUTOREGRESSIVE models ,ECONOMETRIC models ,JOINT ventures ,MERGER agreements - Abstract
This editorial summarizes the papers published in issue 16(4) (2021). The first paper adopts a higher order spatial autoregressive model with endogenous spatial weight matrices. The second paper investigates the existence of the law of one price using regional observations over time. The third paper develops an economic-theoretical model that goes against the common belief that the most productive individuals and firms agglomerate at the core. The fourth paper provides empirical evidence that merger and acquisition deals are more likely to occur between firms in culturally than in geographically contiguous countries. The fifth paper develops a spatial econometric estimator based on the indirect inference principle. The sixth paper examines the investment behaviour of First Nation governments through joint ventures. The seventh paper employs a spatial econometric model with an endogenous spatial weight matrix to construct intraregional input-output models. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
14. Raising the bar (19).
- Author
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Elhorst, Paul, Abreu, Maria, Amaral, Pedro, Bhattacharjee, Arnab, Bond-Smith, Steven, Chasco, Coro, Corrado, Luisa, Ditzen, Jan, Felsenstein, Daniel, Fuerst, Franz, McCann, Philip, Monastiriotis, Vassilis, Quatraro, Francesco, Temursho, Umed, and Yu, Jihai
- Subjects
HOME ownership ,AGRICULTURAL climatology ,SECOND homes ,CROP yields ,CLIMATE change ,HOUSE buying - Abstract
This editorial summarizes the papers published in issue 17(1) (2022). This issue begins with a second editorial calling on researchers to publish replication results from previous studies. The first paper applies a spatiotemporal Bayesian hierarchical model for understanding the dynamics of second home ownership in Corsica. The second paper determines the optimal time to invest in a new airport using real options analysis. The third paper employs unit root tests to provide empirical evidence that environmental policy changes have not been effective up to now. The fourth paper provides empirical evidence that regional spillover effects should play a crucial role in the policy discussion about climate change. The fifth paper forecasts the direct impact of climate change on crop yields in the agricultural sector and the indirect impacts on other sectors of the Brazilian economy up to 2100. The sixth paper investigates whether the percentage of women in national parliaments positively affects public expenditures on social needs both internally and in neighbouring countries. The seventh paper sets out a general framework for store sales evaluation and prediction. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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15. New Orbit Determination Technique Using Lunar Reflectors.
- Author
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Frank, Jared and Younes, Ahmad Bani
- Abstract
This paper investigates the practicality of an autonomous and resilient positional navigation using corner cube reflectors on the lunar surface. The proposed approach stands as an efficient navigation solution when the current system, e.g. GPS, is unavailable due to being attacked, jammed or spoofed by a third party. The paper provides a complete setup of the mathematical models using a nonlinear least squares algorithm and covariance analysis. A study is done that determines how the blockage of the Earth affects the proposed solution’s ability to perform positional navigation. Numerical simulations are presented to show the accuracy, performance and practicality of the proposed solution. The results of the proposed solution are compared with the results of an Earth-based ground station system that uses radio frequency to track the given satellite. The results show that the lunar reflector-based system generates more accurate results than the Earth-based ground station system. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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16. The dynamic general nesting spatial econometric model for spatial panels with common factors
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Elhorst, J. Paul and Research programme EEF
- Subjects
Spatial spillovers ,Original Paper ,Economics and Econometrics ,Bar (music) ,Geography, Planning and Development ,Nesting (process) ,Raising (metalworking) ,Dynamic effects ,Spatial panels ,Econometric model ,C51 ,Econometrics ,Economics ,Common factors ,C21 ,Estimation ,Social Sciences (miscellaneous) ,C23 - Abstract
The dynamic general nesting spatial econometric model for spatial panels with common factors is the most advanced model currently available. It accounts for local spatial dependence by means of an endogenous spatial lag, exogenous spatial lags, and a spatial lag in the error term. It accounts for dynamic effects by means of the dependent variable lagged in time, and the dependent variable lagged in both space and time. Finally, it accounts for global cross-sectional dependence by means of cross-sectional averages or principal components with heterogeneous coefficients, which generalizes the traditional controls for time-invariant and spatial-invariant variables by unit-specific and time-specific effects. This paper provides an overview of the main arguments in favor of each of these model components, as well as some potential pitfalls.
- Published
- 2022
17. A Survey on Deep Learning Techniques for Stereo-Based Depth Estimation.
- Author
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Laga, Hamid, Jospin, Laurent Valentin, Boussaid, Farid, and Bennamoun, Mohammed
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DEEP learning ,COMPUTER vision ,MACHINE learning ,AUGMENTED reality ,LEARNING communities ,AUTONOMOUS vehicles - Abstract
Estimating depth from RGB images is a long-standing ill-posed problem, which has been explored for decades by the computer vision, graphics, and machine learning communities. Among the existing techniques, stereo matching remains one of the most widely used in the literature due to its strong connection to the human binocular system. Traditionally, stereo-based depth estimation has been addressed through matching hand-crafted features across multiple images. Despite the extensive amount of research, these traditional techniques still suffer in the presence of highly textured areas, large uniform regions, and occlusions. Motivated by their growing success in solving various 2D and 3D vision problems, deep learning for stereo-based depth estimation has attracted a growing interest from the community, with more than 150 papers published in this area between 2014 and 2019. This new generation of methods has demonstrated a significant leap in performance, enabling applications such as autonomous driving and augmented reality. In this paper, we provide a comprehensive survey of this new and continuously growing field of research, summarize the most commonly used pipelines, and discuss their benefits and limitations. In retrospect of what has been achieved so far, we also conjecture what the future may hold for deep learning-based stereo for depth estimation research. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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18. A Mono SLAM Method Based on Depth Estimation by DenseNet-CNN.
- Author
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Jin, Yifan, Yu, Lei, Chen, Zhong, and Fei, Shumin
- Abstract
Currently, SLAM (simultaneous localization and mapping) systems based on monocular cameras cannot directly obtain depth information, and most of them have problems with scale uncertainty and need to be initialized. In some application scenarios that require navigation and obstacle avoidance, the inability to achieve dense mapping is also a defect of monocular SLAM. In response to the above problems, this paper proposes a method which learns depth estimation by DenseNet and CNN for a monocular SLAM system. We use an encoder-decoder architecture based on transfer learning and convolutional neural networks to estimate the depth information of monocular RGB images. At the same time, through the front-end ORB feature extraction and the back-end direct RGB-D Bundle Adjustment optimization method, it is possible to obtain accurate camera poses and achieve dense indoor mapping when using estimated depth information. The experimental results show that the monocular depth estimation model used in this paper can achieve good results, and it is also competitive in comparison with the current popular methods. On this basis, the error of camera pose estimation is also smaller than traditional monocular SLAM solutions and can complete the dense indoor reconstruction task. It is a complete SLAM system based on monocular camera. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
19. ESTIMATES OF CONSTRUCTION INFRASTRUCTURE STOCK FOR CAPE VERDE: 1980-2019.
- Author
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LOPES, Jorge and TAVARES, Admir
- Subjects
CAPITAL stock ,INFRASTRUCTURE (Economics) ,CONSTRUCTION industry ,INVESTMENTS - Abstract
Building and other construction assets constitute a significant part of a country's physical and economic infrastructure. According to several writers, the knowledge of reliable data of building and other construction assets of a specific country or region is a crucial element for the long-term management of these assets. Built capital stock statistics at the national or international levels have been available for most countries of the world, both developed and less developed ones, for some time, but construction infrastructure stock statistics at the disaggregated level are very scarce, even for most developed countries. Furthermore, the methodologies to produce the estimates of built capital stock, at the international level, do not consider countries' specificities. This paper discusses the methodologic issues for producing construction infrastructure stock statistics for Cape Verde, and makes estimates for the period 1980-2019. The paper outlines the Perpetual Inventory Method (PIM) used to produce capital estimation, data employed, and the assumptions made to estimate missing data. The paper analyses the level of the construction infrastructure stock estimates for Cape Verde, as well as their impact on the development pattern of the country's construction industry, and suggests how further studies can enhance our comprehension of the relationship between construction investment and economic growth and development. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
20. Process Fault and Homoclinic explosion in the Lorenz system.
- Author
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Shams, Zahra and Zarabadipour, Hassan
- Subjects
LORENZ cipher system ,FIXED point theory ,BIFURCATION theory ,DYNAMICAL systems ,CHAOS theory - Abstract
This paper deals with the problem of process faults in the Lorenz system that can affect any of the system parameters and cause the system to exhibit various behaviors. In this paper, the homoclinic orbits in the Lorenz system are described and then the occurrence of process faults in the system is investigated that can cause a homoclinic explosion, bifurcation, change of fixed point, or even instability in the system. In such systems, where a small change in one of the parameters causes large changes in the behavior of the system, to prevent disaster in industrial systems and also to stop the propagation of faults in the system, the faults must be identified as soon as possible. In this paper, the states in the system are estimated by using a reduced-order observer, and the faults are detected. The purpose of this article is to recognize the change in behavior of this system in the face of this type of fault and to express the importance of timely detection and identification of faults in the system so as not to lead to failure and disaster in industrial systems. Finally, the effect of process fault, disturbance, and sensor fault are investigated simultaneously and the states and faults in the system are estimated. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
21. Will there be a third COVID-19 wave? A SVEIRD model-based study of India’s situation
- Author
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Dwarakesh Kannan, Rudra Banerjee, R. Gurusriram, Pritish Kumar Varadwaj, and Srijit Bhattacharjee
- Subjects
SEIRD ,Estimation ,Vaccination rate ,Original Paper ,2019-20 coronavirus outbreak ,History ,Coronavirus disease 2019 (COVID-19) ,Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) ,COVID-19 ,General Physics and Astronomy ,Development economics ,Pandemic ,SARS-CoV-II ,Mass vaccination ,Epidemics ,Third wave ,Model - Abstract
Since the first patient was detected in India in late February 2020, the SARS-CoV-II virus is playing havoc on India. After the first wave, India is now riding the second wave. As was in the case of European countries like Italy and the UK, the second wave is more contagious and at the time of writing this paper, the per day infection is as high as 400,000. The alarming thing is it is not uncommon that people are getting infected multiple times. On the other hand, mass vaccination has started step by step. There is also a growing danger of potential third wave is unavoidable, which can even infect kids and minors. In this situation, an estimation of the dynamics of SARS-CoV-II is necessary to combat the pandemic. We have used a modified SEIRD model that includes vaccination and repeat infection as well. We have studied India and 8 Indian states with varying SARS-CoV-II infections. We have shown that the COVID-19 wave will be repeated from time to time, but the intensity will slow down with time. In the most possible situation, our calculation shows COVID-19 will remain endemic for the foreseeable future unless we can increase our vaccination rate manifold.
- Published
- 2021
22. Heat waves: a hot topic in climate change research
- Author
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Lutz Bornmann, Robin Haunschild, and Werner Marx
- Subjects
FOS: Computer and information sciences ,Estimation ,Original Paper ,Atmospheric Science ,Survivability ,FOS: Physical sciences ,Climate change ,Computer Science - Digital Libraries ,Scientific literature ,Heat wave ,Physics - Atmospheric and Oceanic Physics ,Geography ,Hot weather ,Atmospheric and Oceanic Physics (physics.ao-ph) ,Regional science ,Digital Libraries (cs.DL) ,Urban heat island ,High humidity - Abstract
Research on heat waves (periods of excessively hot weather, which may be accompanied by high humidity) is a newly emerging research topic within the field of climate change research with high relevance for the whole of society. In this study, we analyzed the rapidly growing scientific literature dealing with heat waves. No summarizing overview has been published on this literature hitherto. We developed a suitable search query to retrieve the relevant literature covered by the Web of Science (WoS) as complete as possible and to exclude irrelevant literature (n = 8,011 papers). The time-evolution of the publications shows that research dealing with heat waves is a highly dynamic research topic, doubling within about 5 years. An analysis of the thematic content reveals the most severe heat wave events within the recent decades (1995 and 2003), the cities and countries/regions affected (United States, Europe, and Australia), and the ecological and medical impacts (drought, urban heat islands, excess hospital admissions, and mortality). Risk estimation and future strategies for adaptation to hot weather are major political issues. We identified 104 citation classics which include fundamental early works of research on heat waves and more recent works (which are characterized by a relatively strong connection to climate change)., 40 pages, 2 tables, and 9 figures
- Published
- 2021
23. Estimation of exogenous drivers to predict COVID-19 pandemic using a method from nonlinear control theory
- Author
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Alexander Wasserburger, Lukas Böhler, Michael Bergmann, Christoph Hametner, Robert Kölbl, Stefan Jakubek, Zhang Peng Du, Martin Kozek, and Thomas Bachleitner-Hofmann
- Subjects
Estimation ,Data source ,Original Paper ,Coronavirus disease 2019 (COVID-19) ,Dynamical systems theory ,Computer science ,Epidemiological modelling ,Applied Mathematics ,Mechanical Engineering ,Psychological intervention ,COVID-19 ,Differential flatness ,Aerospace Engineering ,Ocean Engineering ,Nonlinear control ,Complement (complexity) ,Control and Systems Engineering ,SARS-CoV2 ,Dynamical systems ,Pandemic ,Econometrics ,Electrical and Electronic Engineering - Abstract
The currently ongoing COVID-19 pandemic confronts governments and their health systems with great challenges for disease management. Epidemiological models play a crucial role, thereby assisting policymakers to predict the future course of infections and hospitalizations. One difficulty with current models is the existence of exogenous and unmeasurable variables and their significant effect on the infection dynamics. In this paper, we show how a method from nonlinear control theory can complement common compartmental epidemiological models. As a result, one can estimate and predict these exogenous variables requiring the reported infection cases as the only data source. The method allows to investigate how the estimates of exogenous variables are influenced by non-pharmaceutical interventions and how imminent epidemic waves could already be predicted at an early stage. In this way, the concept can serve as an “epidemometer” and guide the optimal timing of interventions. Analyses of the COVID-19 epidemic in various countries demonstrate the feasibility and potential of the proposed approach. The generic character of the method allows for straightforward extension to different epidemiological models.
- Published
- 2021
24. Moving-horizon estimation approach for nonlinear systems with measurement contaminated by outliers.
- Author
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Awawdeh, Moath, Faisal, Tarig, Bashir, Anees, Nour Alshbatat, Abdel Ilah, and Momani, Rana T. H.
- Subjects
NONLINEAR systems ,NONLINEAR estimation ,LINEAR time invariant systems ,LINEAR systems ,KALMAN filtering - Abstract
An application of moving-horizon strategy for nonlinear systems with possible outliers in measurements is addressed. With the increased success of movinghorizon strategy in the state estimation for linear systems with outliers acting on the measurement, investigating the nonlinear approach is highly required. In this paper we applied the nonlinear version which has been presented in the literature in term of discrete-time linear time-invariant systems, where the applied strategy considers minimizing a least-squares functions in which each measure possibly contaminated by outlier is left out in turn and the lowest cost is propagated. The moving horizon filter effectiveness as compared with the extended Kalman filter is shown by means of simulation example and estimation error comparison. The moving horizon filter shows the feature of resisting outliers with robust estimation. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
25. Quantification of Harm in EU Consumer Antitrust Actions for Damages.
- Author
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SERAFIMOVA, Mariya
- Subjects
DAMAGES (Law) ,ANTITRUST violation lawsuits ,ANTITRUST law ,CONSUMERS ,CIVIL law ,LAW enforcement ,CONSUMER protection - Abstract
This paper analyses the development of private actions for damages as a significant pillar of private enforcement of EU competition law and discusses the quantification and estimation of harm. Since the adoption of the EU Directive 2014/104/EU on Antitrust Damages Actions, private enforcement in Europe has undergone crucial clarifications in the case law of EU courts, yet the critical issue of quantifying damages in private actions has only recently been addressed by the Court of Justice of the European Union (CJEU). This paper takes a closer look at the recent ruling in the Tráficos Manuel Ferrer case (C-312/21) and assesses the implications of that case law for private enforcement proceedings. Concerning the allocation of procedural costs, this judgment has established that injured parties may be required to bear a cost risk, even if they are partially successful. This finding needs further reflection in the context of consumer claims for damages, as it is susceptible to add an additional cost burden on plaintiffs. The second intricate finding concerns the relation between the ability of national courts to estimate damages and the exhaustion of evidence disclosure. Taking the example of Spain, the paper advocates for the specific inclusion of the principle of proportionality when determining harm in private actions for damages and especially in cases involving consumers or smaller harmed parties. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
26. On the Interpolating Family of Distributions.
- Author
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Nadarajah, Saralees and Okorie, Idika E.
- Subjects
MAXIMUM likelihood statistics ,BETA functions ,MAXIMUM entropy method - Abstract
A recent paper introduced the interpolating family (IF) of distributions, and they also derived various mathematical properties of the family. Some of the most important properties discussed were the integer order moments of the IF distributions. The moments were expressed as an integral (which were not evaluated) or as finite sums of the beta function. In this paper, more general expressions for moments of any integer order or any real order are derived. Apart from being more general, our expressions converge for a wider range of parameter values. The expressions for entropies are also derived, the maximum likelihood estimation is considered and the finite sample performance of maximum likelihood estimates is investigated. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
27. Evasion problem in a differential game with geometric constraints.
- Author
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G. I., Ibragimov and T. G., Tursunaliev
- Subjects
DIFFERENTIAL games ,LINEAR equations ,GAMES - Abstract
In this paper, we study the evasion game of high speed evader involving two pursuers and a single evader with geometric constraints on the control parameters of the players in the plane. The game is described by linear equations. Evasion is said to be possible if the state of the evader doesn’t coincide with the state of any pursuer for all time. We construct an evasion strategy for the evader which ensure completion the evasion game for any initial positions of players. In addition, we introduce a new concept of approach times and demonstrate that the number of approach times does not exceed 3. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
28. Mathematical modeling and estimation for next wave of COVID-19 in Poland
- Author
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M. K. Arti and Antoni Wilinski
- Subjects
Estimation ,Original Paper ,Environmental Engineering ,Coronavirus disease 2019 (COVID-19) ,Computer science ,COVID-19 ,Mixture model ,Corona ,Gaussian Mixture Model ,Mathematical Modelling ,Environmental Chemistry ,Statistical physics ,Current (fluid) ,Prediction ,Safety, Risk, Reliability and Quality ,Pandemics ,General Environmental Science ,Water Science and Technology - Abstract
We investigate the problem of mathematical modeling of new corona virus (Covid19) in Poland and tries to predict the upcoming wave. A Gaussian mixture model is proposed to characterize the COVID-19 disease and to predict a new / future wave of COVID-19. This prediction is very much needed to prepare for medical setup and continue with the upcoming program. Specifically, data related to the new confirmed cases of COVID-19 per day are considered, and then we attempt to predict the data and statistical activity. A close match between actual data and analytical data by using the Gaussian mixture model shows that it is a suitable model to present new cases of COVID-19. In addition, it is thought that there are N waves of COVID-19 and that information for each future wave is also present in current and previous waves as well. Using this concept, predictions of a future wave can be made.
- Published
- 2021
29. A Wavelet Evaluation of Some Leading Business Cycle Indicators for the German Economy
- Author
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Krüger, Jens J.
- Subjects
Estimation ,Economics and Econometrics ,Leading indicators ,Index (economics) ,E37 ,media_common.quotation_subject ,Wavelet analysis ,Phase difference ,Term (time) ,Interest rate ,Business cycle forecasting ,Wavelet ,Economic indicator ,Economics ,Econometrics ,Business cycle ,Stock market ,C49 ,Statistics, Probability and Uncertainty ,Business and International Management ,Finance ,Research Paper ,E32 ,media_common - Abstract
Leading indicators are important variables in business cycle forecasting. We use wavelet analysis to investigate the lead-lag stability of German leading indicators in time-frequency space. This method permits a time-varying relation of the leading indicators to the reference cycle allowing simultaneously to focus on lead-lag stability at the specific business cycle frequencies. In this way we analyze an index of new orders, a survey-based index of business expectations, an index of stock market returns and the interest rate term spread. We confirm that most of these indicators are indeed leading the reference cycle most of the time, but the number of months leading varies considerably over time and is associated with a great deal of estimation uncertainty.
- Published
- 2021
30. A class of estimators based on overlapping sample spacings
- Author
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Singh, Rahul and Misra, Neeraj
- Published
- 2023
- Full Text
- View/download PDF
31. Social media based digital file size estimation method using sampling technique with α control chart in big data.
- Author
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Alim, Abdul and Shukla, Diwakar
- Subjects
SOCIAL media ,ESTIMATION theory ,STATISTICAL sampling ,BIG data ,CONFIDENCE intervals ,MACHINE learning - Abstract
Due to the emergence of social networking platforms, a large number of users around the world are being part and partial of this platform. At a fraction of the time users on social media are communicating digital files in the form of text, video, images, voice and music which ultimately generates big data. The matter of interest is to estimate precisely the average file size at time duration (occasion). The time may hours or days or months. This paper presents a sample-based methodology to deal with mean size estimation of digital communication content spreading on a social media platform. An estimator is suggested using a random sample from big data and its properties are derived. A simulation method is suggested that computes the confidence interval (CI) for the prediction of précised range of digital file size. The proposed method produces an optimal confidence interval at the suitable choice of constant. These estimated confidence intervals can be used for developing α-control charts for constant monitoring of the growth in file size in social media storage at the data centre. If the growth of mean digital file size crosses the upper limit then additional storage infrastructure is needed at the administration level of the social media site. One can generate machine learning algorithms proposed method for monitoring the growth of average digital file size over time duration. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
32. Defining, identifying, and estimating causal effects with the potential outcomes framework: a review for education research.
- Author
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Keller, Bryan and Branson, Zach
- Abstract
Causal inference involves determining whether a treatment (e.g., an education program) causes a change in outcomes (e.g., academic achievement). It is well-known that causal effects are more challenging to estimate than associations. Over the past 50 years, the potential outcomes framework has become one of the most widely used approaches for defining, identifying, and estimating causal effects. In this paper, we review the potential outcomes framework with a focus on potential outcomes notation to define individual and average causal effects. We then show how three canonical assumptions, Unconfoundedness, Positivity, and Consistency, may be used to identify average causal effects. The identification results motivate methods for estimating causal effects in practice, which include model-based estimators, such as regression, inverse probability weighting, and doubly robust estimation, and procedures that target covariate balance, such as matching and stratification. Examples and discussion are grounded in the context of a running example of a study aimed at assessing the causal effect of receipt of special education services on 5th grade mathematics achievement in school-aged children. Practical considerations for education research are discussed. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
33. A review of ridge parameter selection: minimization of the mean squared error vs. mitigation of multicollinearity.
- Author
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García García, Catalina, Salmerón Gómez, Roman, and García Pérez, José
- Subjects
- *
MONTE Carlo method , *ESTIMATION bias , *PARAMETER estimation , *PRICE inflation - Abstract
Ridge Estimation (RE) is a widespread method to overcome the problem of collinearity defining a class of estimators depending on the non-negative scalar parameter k. A great number of papers focus on the estimation of this biasing parameter. Traditionally, the mean squared error criterion is used to compare the performance of the different proposed estimators. However, the minimization of the mean squared error (MSE) does not always guarantee the mitigation of collinearity, meaning it is possible, for example, to obtain a variance inflation factor (VIF) higher than 10 for the k that minimizes the MSE. In this paper, we propose the VIF criteria to select the biased ridge parameter. A Monte Carlo simulation is presented with results that support this idea. Also, two real life empirical applications are used to illustrate the contribution of this paper. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
34. The Maxwell-Boltzmann-Exponential distribution with regression model.
- Author
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Altun, Emrah and Altun, Gökçen
- Subjects
DISTRIBUTION (Probability theory) ,REGRESSION analysis ,PARAMETER estimation ,PROBABILITY theory ,MIXTURES - Abstract
This paper proposes a new probability model called as Maxwell-Boltzmann-Exponential (MBE) distribution. The MBE distribution arises as a mixture distribution of the Maxwell-Boltzmann and exponential distributions. The statistical properties of the distributions are studied and obtained in closed-form expressions. Three methodologies are assessed and compared for the estimation of parameters in the MBE distribution. The MBE regression model is defined, with the proposed regression model being an alternative to the gamma regression model for response variables that are extremely right-skewed and bimodal. Two real data sets are used to demonstrate the applicability of the proposed models against the existing models. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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- View/download PDF
35. Cross-Task Inconsistency Based Active Learning (CTIAL) for Emotion Recognition.
- Author
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Xu, Yifan, Jiang, Xue, and Wu, Dongrui
- Abstract
Emotion recognition is a critical component of affective computing. Training accurate machine learning models for emotion recognition typically requires a large amount of labeled data. Due to the subtleness and complexity of emotions, multiple evaluators are usually needed for each affective sample to obtain its ground-truth label, which is expensive. To save the labeling cost, this paper proposes an inconsistency-based active learning approach for cross-task transfer between emotion classification and estimation. Affective norms are utilized as prior knowledge to connect the label spaces of categorical and dimensional emotions. Then, the prediction inconsistency on the two tasks for the unlabeled samples is used to guide sample selection in active learning for the target task. Experiments on within-corpus and cross-corpus transfers demonstrated that cross-task inconsistency could be a very valuable metric in active learning. To our knowledge, this is the first work that utilizes prior knowledge on affective norms and data in a different task to facilitate active learning for a new task, even the two tasks are from different datasets. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
36. Modeling Data with Extreme Values Using Three-Spliced Distributions.
- Author
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Bâcă, Adrian and Vernic, Raluca
- Subjects
EXTREME value theory ,DATA modeling ,INSURANCE - Abstract
When data exhibit a high frequency of small to medium values and a low frequency of large values, fitting a classical distribution might fail. This is why spliced models defined from different distributions on distinct intervals are proposed in the literature. In contrast to the intensive study of two-spliced distributions, the case with more than two components is scarcely approached. In this paper, we focus on three-spliced distributions and on their ability to improve the modeling of extreme data. For this purpose, we consider a popular insurance data set related to Danish fire losses, to which we fit several three-spliced distributions; moreover, the results are compared to the best-fitted two-spliced distributions from previous studies. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
37. In-flight estimation of quadrotor mass and inertia using all-accelerometer.
- Author
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Al-Rawashdeh, Yazan M., Elshafei, Moustafa, and Ouakad, Hassen M.
- Subjects
MOTION analysis ,CLOSED loop systems ,RIGID bodies ,GRAVITY ,TORQUE - Abstract
In this paper, an on-line closed-loop identification of mainly mass and inertia of an under-actuated aerial vehicle, namely a quadrotor acting as an aerial manipulator, is presented. Being treated as a rigid body, only one set of eighteen- or six tri-axial linear accelerometers is used to facilitate such estimation. Force and torque disturbances acting upon the vehicle during identification are also estimated which will refine the overall estimation quality of the unknown parameters. Namely, recursive linear and nonlinear least squares methods are used to obtain initial and refined estimations, respectively. Random disturbances are introduced to the closed-loop system to ensure enough excitation of the overall system. Issues related to identifiability, stability and performance are discussed. Since the proposed method depends on general kinematical and dynamical analyses of motion, it is claimed that the presented method will be also applicable to a wider range of, mainly, aerial vehicles. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
38. Estimation of final standings in football competitions with a premature ending: the case of COVID-19
- Author
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Paolo Gorgi, Rutger Lit, Siem Jan Koopman, Econometrics and Data Science, and Tinbergen Institute
- Subjects
Statistics and Probability ,Estimation ,Original Paper ,Economics and Econometrics ,Schedule ,2019-20 coronavirus outbreak ,Coronavirus disease 2019 (COVID-19) ,Computer science ,Applied Mathematics ,Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) ,COVID-19 ,Football ,Sport statistics ,SDG 3 - Good Health and Well-being ,Ranking ,League table ,Modeling and Simulation ,Bivariate Poisson ,Paired-comparison models ,Econometrics ,Social Sciences (miscellaneous) ,Analysis - Abstract
We study an alternative approach to determine the final league table in football competitions with a premature ending. For several countries, a premature ending of the 2019/2020 football season has occurred due to the COVID-19 pandemic. We propose a model-based method as a possible alternative to the use of the incomplete standings to determine the final table. This method measures the performance of the teams in the matches of the season that have been played and predicts the remaining non-played matches through a paired-comparison model. The main advantage of the method compared to the incomplete standings is that it takes account of the bias in the performance measure due to the schedule of the matches in a season. Therefore, the resulting ranking of the teams based on our proposed method can be regarded as more fair in this respect. A forecasting study based on historical data of seven of the main European competitions is used to validate the method. The empirical results suggest that the model-based approach produces more accurate predictions of the true final standings than those based on the incomplete standings.
- Published
- 2021
39. Evaluating the estimation of genetic correlation and heritability using summary statistics
- Author
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Fredrick R. Schumacher and Ju Zhang
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Genetic correlation ,Population ,Methods Paper ,Single-nucleotide polymorphism ,Biology ,Polymorphism, Single Nucleotide ,Heritability ,Quantitative Trait, Heritable ,Neoplasms ,Statistics ,Genetics ,Humans ,Generalizability theory ,Computer Simulation ,Genetic Predisposition to Disease ,education ,Evaluation ,Molecular Biology ,Estimation ,education.field_of_study ,Models, Genetic ,General Medicine ,Summary statistics ,Sample size determination ,Genetic Background ,Genome-Wide Association Study - Abstract
While novel statistical methods quantifying the shared heritability of traits and diseases between ancestral distinct populations have been recently proposed, a thorough evaluation of these approaches under differing circumstances remain elusive. Brown et al.2016 proposed the method Popcorn to estimate the shared heritability, i.e. genetic correlation, using only summary statistics. Here, we evaluate Popcorn under several parameters and circumstances: sample size, number of SNPs, sample size of external reference panel, various population pairs, inappropriate external reference panel, and admixed population involved. Our results determined the minimum sample size of the external reference panel, summary statistics, and number of SNPs required to accurately estimate both the genetic correlation and heritability. Moreover, the number of individuals and SNPs required to produce accurate and stable estimates was directly proportional with heritability in Popcorn. Misrepresentation of the reference panel overestimated the genetic correlation by 20% and heritability by 60%. Lastly, applying Popcorn to homogeneous (EUR) and admixed (ASW) populations underestimated the genetic correlation by 15%. Although statistical approaches estimating the shared heritability between ancestral populations will provide novel etiologic insight, caution is required ensuring results are based on the appropriate sample size, number of SNPs, and the generalizability of the reference panel to the discovery populations.
- Published
- 2021
40. Overview and Efficiency of Decoder-Side Depth Estimation in MPEG Immersive Video.
- Author
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Mieloch, Dawid, Garus, Patrick, Milovanovic, Marta, Jung, Joel, Jeong, Jun Young, Ravi, Smitha Lingadahalli, and Salahieh, Basel
- Subjects
VIDEO coding ,MACHINE learning ,VIDEOS ,VIDEO codecs ,BINARY sequences ,VIDEO processing - Abstract
This paper presents the overview and rationale behind the Decoder-Side Depth Estimation (DSDE) mode of the MPEG Immersive Video (MIV) standard, using the Geometry Absent profile, for efficient compression of immersive multiview video. A MIV bitstream generated by an encoder operating in the DSDE mode does not include depth maps. It only contains the information required to reconstruct them in the client or in the cloud: decoded views and metadata. The paper explains the technical details and techniques supported by this novel MIV DSDE mode. The description additionally includes the specification on Geometry Assistance Supplemental Enhancement Information which helps to reduce the complexity of depth estimation, when performed in the cloud or at the decoder side. The depth estimation in MIV is a non-normative part of the decoding process, therefore, any method can be used to compute the depth maps. This paper lists a set of requirements for depth estimation, induced by the specific characteristics of the DSDE. The depth estimation reference software, continuously and collaboratively developed with MIV to meet these requirements, is presented in this paper. Several original experimental results are presented. The efficiency of the DSDE is compared to two MIV profiles. The combined non-transmission of depth maps and efficient coding of textures enabled by the DSDE leads to efficient compression and rendering quality improvement compared to the usual encoder-side depth estimation. Moreover, results of the first evaluation of state-of-the-art multiview depth estimators in the DSDE context, including machine learning techniques, are presented. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
41. Predicting COVID-19 transmission to inform the management of mass events: a model-based approach
- Author
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David Liu, Tõnu Esko, Austen El-Osta, Claire Donnat, Jack Kreindler, Filippos T. Filippidis, Freddy Bunbury, and Matthew Harris
- Subjects
Estimation ,Original Paper ,SARS-CoV-2 ,Computer science ,media_common.quotation_subject ,Public Health, Environmental and Occupational Health ,COVID-19 ,Health Informatics ,Disease Outbreaks ,Neglect ,transmission dynamics ,Transmission (telecommunications) ,Statistics ,Humans ,Tail risk ,Duration (project management) ,Risk assessment ,live event management ,Monte Carlo simulation ,Event (probability theory) ,media_common ,Quantile - Abstract
Background Modelling COVID-19 transmission at live events and public gatherings is essential to controlling the probability of subsequent outbreaks and communicating to participants their personalized risk. Yet, despite the fast-growing body of literature on COVID-19 transmission dynamics, current risk models either neglect contextual information including vaccination rates or disease prevalence or do not attempt to quantitatively model transmission. Objective This paper attempted to bridge this gap by providing informative risk metrics for live public events, along with a measure of their uncertainty. Methods Building upon existing models, our approach ties together 3 main components: (1) reliable modelling of the number of infectious cases at the time of the event, (2) evaluation of the efficiency of pre-event screening, and (3) modelling of the event’s transmission dynamics and their uncertainty using Monte Carlo simulations. Results We illustrated the application of our pipeline for a concert at the Royal Albert Hall and highlighted the risk’s dependency on factors such as prevalence, mask wearing, and event duration. We demonstrate how this event held on 3 different dates (August 20, 2020; January 20, 2021; and March 20, 2021) would likely lead to transmission events that are similar to community transmission rates (0.06 vs 0.07, 2.38 vs 2.39, and 0.67 vs 0.60, respectively). However, differences between event and background transmissions substantially widened in the upper tails of the distribution of the number of infections (as denoted by their respective 99th quantiles: 1 vs 1, 19 vs 8, and 6 vs 3, respectively, for our 3 dates), further demonstrating that sole reliance on vaccination and antigen testing to gain entry would likely significantly underestimate the tail risk of the event. Conclusions Despite the unknowns surrounding COVID-19 transmission, our estimation pipeline opens the discussion on contextualized risk assessment by combining the best tools at hand to assess the order of magnitude of the risk. Our model can be applied to any future event and is presented in a user-friendly RShiny interface. Finally, we discussed our model’s limitations as well as avenues for model evaluation and improvement.
- Published
- 2021
42. Neutrosophic Topp-Leone Distribution for Interval-Valued Data Analysis
- Author
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Ahsan-ul-Haq, Muhammad, Zafar, Javeria, Aslam, Muhammad, and Tariq, Saadia
- Published
- 2024
- Full Text
- View/download PDF
43. BİR OLUKLU MUKAVVA İŞLETMESİNDE REGRESYON ANALİZİ İLE MAKİNE İŞLEM SÜRELERİNİN TAHMİN EDİLMESİ.
- Author
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ÇAPRAZ, Ozan, ALTAY, Gülşah, and POLAT, Olcay
- Subjects
PRODUCTION planning ,REGRESSION analysis ,CARDBOARD ,MACHINERY - Abstract
Copyright of SDU Journal of Engineering Sciences & Design / Mühendislik Bilimleri ve Tasarım Dergisi is the property of Journal of Engineering Sciences & Design and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2023
- Full Text
- View/download PDF
44. Zero to k Inflated Poisson Regression Models with Applications.
- Author
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Saboori, Hadi and Doostparast, Mahdi
- Subjects
GENERALIZATION ,SET theory ,REGRESSION analysis ,POISSON distribution ,DATA analysis - Abstract
In the count data set, the frequency of some points may occur more than expected under the standard data analysis models. Indeed, in many situations, the frequencies of zero and of some other points tend to be higher than those of the Poisson. Adapting existing models for analyzing inflated observations has been studied in the literature. A method for modeling the inflated data is the inflated distribution. In this paper, we extend this inflated distribution. Indeed, if inflations occur in three or more of the support point, then the previous models are not suitable. We propose a model based on zero, one, ... , and k inflated points with probabilities w 0 , w 1 , ... , and w k , respectively. By choosing the appropriate values for the weights w 0 , ... , w k , various inflated distributions, such as the zero-inflated, zero–one-inflated, and zero–k-inflated distributions, are derived as special cases of the proposed model in this paper. Various illustrative examples and real data sets are analyzed using the obtained results. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
45. Multi-gene GP and GA-FIS models to deal with scaling problem in the ANFIS model for estimating roughness coefficient in erodible channels.
- Author
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Zanganeh, M.
- Subjects
HYDRAULICS ,GENETIC algorithms ,REYNOLDS number ,WATER depth ,FUZZY logic - Abstract
Estimation of the roughness coefficient is important for reliable hydraulic design in erodible channels. In this paper, the capability of multi-gene Genetic Programming (GP), a combined Genetic Algorithm and Fuzzy Inference System (GA-FIS) model, and Multi Regression (MR) methods are employed to estimate the roughness coefficient. These methods try to extract either an explicit or an implicit relationship between the roughness coefficient and input variables. In addition, traditional GP, widely used by researchers, and conventional empirical formulas are implemented to evaluate the models. Results show that the employed methods are more accurate than empirical methods. In addition, the effects of some other parameters, such as non-dimensional water depth and shear Reynolds number, are highlighted over the roughness coefficient while previously ignored in the empirical methods. Also, findings prove that the GA is a helpful tool to optimize a FIS compared with gradient-based models like ANFIS, while the scale of input variables is not in the same order. The R2 for multi-gene GP and GA-FIS are 0.8504 and 0.8842, respectively, while this value for the most accurate empirical method (Yalin, 1992) is 0.6286. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
46. Embedded Design and Implementation of a Wireless Multimedia Platform for Digital Estimation of Agricultural Output.
- Author
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Wei, Qing, Lin, Qiaoli, and Srivastava, Gautam
- Subjects
SUPPORT vector machines ,AGRICULTURE ,AGRICULTURAL development ,LABOR supply ,DIGITAL media - Abstract
The estimation of agricultural output is an important issue in the digital development of modern agriculture. Using embedded technology, this paper designs a multimedia platform for digital estimation of agricultural output. The terminal design of the multimedia platform selects the Intel Xscale series PXA255 processor as the core processor, uses multiple sensors to collect agricultural output-related environmental parameters and selects the digital media processing chip TMS320DM642 for multimedia processing. The software used selects the grey relational Support Vector Machine (SVM) algorithm to estimate agricultural output. First, the collected agricultural sown area, labor force, mechanical power, irrigated area, agricultural production environment and other parameters are collected as input to grey relational SVM. Second, the estimated results are outputted. Finally, the results of agricultural output estimation are digitally displayed by a display interface on the embedded multimedia terminal. The experimental results show that the prediction error is less than 1%, and the prediction accuracy is higher than 99%, which validates that the method can accurately predict agricultural output with an abundance of applications. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
47. Unscented Kalman Filter for Estimation of Manifold Absolute Pressure in Engines.
- Author
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Shanmughasundaram, R., Supriya, P., and Nambiar, T. N. P.
- Subjects
KALMAN filtering ,STANDARD deviations ,AIR-fuel ratio (Combustion) ,AUTOMOBILE emissions ,PERFORMANCE of automobiles - Abstract
In a global scenario, the exhaust emissions of automobiles need to be regulated. These emission regulations are met by maintaining the air-fuel ratio resulting in improved automobile performance like better engine torque and fuel economy. The air-fuel ratio of Spark Ignition (SI) engines needs to be maintained at a stoichiometric value of 14.7:1. To maintain this ratio, the estimation of the in-cylinder mass airflow rate is highly significant. One of the important parameters that influence the mass airflow rate is Manifold Absolute Pressure (MAP). The conventional methods that make use of MAP sensors have oscillations at engine firing frequency and poor dynamic response. This research paper uses an Unscented Kalman Filter (UKF) for the estimation of MAP in SI engines. The complete system consisting of the engine model and UKF algorithm has been simulated in Matlab/Simulink. With Root Mean Square Error (RMSE) as the performance metric, the accuracy in the estimation of MAP with UKF is higher than the Extended Kalman Filter (EKF). Hence, the UKF algorithm works out to be a better estimator for the efficient fuel injection in an engine management system. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
48. LAEO-Net++: Revisiting People Looking at Each Other in Videos.
- Author
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Marin-Jimenez, Manuel J., Kalogeiton, Vicky, Medina-Suarez, Pablo, and Zisserman, Andrew
- Subjects
VIDEOS ,SOCIAL interaction ,SOCIAL networks ,BASE pairs ,TASK analysis ,MAGNETIC recording heads - Abstract
Capturing the ‘mutual gaze’ of people is essential for understanding and interpreting the social interactions between them. To this end, this paper addresses the problem of detecting people Looking At Each Other (LAEO) in video sequences. For this purpose, we propose LAEO-Net++, a new deep CNN for determining LAEO in videos. In contrast to previous works, LAEO-Net++ takes spatio-temporal tracks as input and reasons about the whole track. It consists of three branches, one for each character's tracked head and one for their relative position. Moreover, we introduce two new LAEO datasets: UCO-LAEO and AVA-LAEO. A thorough experimental evaluation demonstrates the ability of LAEO-Net++ to successfully determine if two people are LAEO and the temporal window where it happens. Our model achieves state-of-the-art results on the existing TVHID-LAEO video dataset, significantly outperforming previous approaches. Finally, we apply LAEO-Net++ to a social network, where we automatically infer the social relationship between pairs of people based on the frequency and duration that they LAEO, and show that LAEO can be a useful tool for guided search of human interactions in videos. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
49. Learning Progressive Distributed Compression Strategies From Local Channel State Information.
- Author
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Sohrabi, Foad, Jiang, Tao, and Yu, Wei
- Abstract
This paper proposes a deep learning framework to design distributed compression strategies in which distributed agents need to compress high-dimensional observations of a source, then send the compressed bits via bandwidth limited links to a fusion center for source reconstruction. Further, we require the compression strategy to be progressive so that it can adapt to the varying link bandwidths between the agents and the fusion center. Moreover, to ensure scalability, we investigate strategies that depend only on the local channel state information (CSI) at each agent. Toward this end, we use a data-driven approach in which the progressive linear combination and uniform quantization strategy at each agent are trained as a function of its local CSI. To deal with the challenges of modeling the quantization operations (which always produce zero gradients in the training of neural networks), we propose a novel approach of exploiting the statistics of the batch training data to set the dynamic ranges of the uniform quantizers. Numerically, we show that the proposed distributed estimation strategy designed with only local CSI can significantly reduce the signaling overhead and can achieve a lower mean-squared error distortion for source reconstruction than state-of-the-art designs that require global CSI at comparable overall communication cost. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
50. Digital file size computational procedure in multimedia big data using sampling methodology
- Author
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Alim, Abdul and Shukla, Diwakar
- Published
- 2023
- Full Text
- View/download PDF
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