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1,516 Results Found

  • Article
  • Open Access
516 Views
15 Pages

27 November 2025

Although greenhouse microclimates typically exhibit gradual and near-linear transitions, abrupt fluctuations in external weather conditions and actuator operations introduce nonlinear dynamics that complicate accurate interpretation and prediction. P...

  • Article
  • Open Access
32 Citations
3,966 Views
30 Pages

Covariance Matrix Adaptation Evolution Strategy for Improving Machine Learning Approaches in Streamflow Prediction

  • Rana Muhammad Adnan Ikram,
  • Leonardo Goliatt,
  • Ozgur Kisi,
  • Slavisa Trajkovic and
  • Shamsuddin Shahid

17 August 2022

Precise streamflow estimation plays a key role in optimal water resource use, reservoirs operations, and designing and planning future hydropower projects. Machine learning models were successfully utilized to estimate streamflow in recent years In t...

  • Article
  • Open Access
11 Citations
3,387 Views
25 Pages

9 March 2022

Missing covariates in regression or classification problems can prohibit the direct use of advanced tools for further analysis. Recent research has realized an increasing trend towards the use of modern Machine-Learning algorithms for imputation. Thi...

  • Article
  • Open Access
1,948 Views
23 Pages

29 February 2024

In the field of reliability engineering, covariate information shared among product units within a specific group (e.g., a manufacturing batch, an operating region), such as operating conditions and design settings, exerts substantial influence on pr...

  • Article
  • Open Access
10 Citations
8,973 Views
24 Pages

Covariance Prediction in Large Portfolio Allocation

  • Carlos Trucíos,
  • Mauricio Zevallos,
  • Luiz K. Hotta and
  • André A. P. Santos

Many financial decisions, such as portfolio allocation, risk management, option pricing and hedge strategies, are based on forecasts of the conditional variances, covariances and correlations of financial returns. The paper shows an empirical compari...

  • Article
  • Open Access
3 Citations
3,766 Views
29 Pages

25 June 2024

Under Condition-Based Maintenance, the Proportional Hazards Model (PHM) uses Cox’s partial regression and vital signs as covariates to estimate risk for predictive management. However, maintenance faces challenges when dealing with a multi-cova...

  • Article
  • Open Access
1 Citations
3,219 Views
27 Pages

12 June 2024

The proportional hazards model (PHM) is a vital statistical procedure for condition-based maintenance that integrates age and covariates monitoring to estimate asset health and predict failure risks. However, when dealing with multi-covariate scenari...

  • Article
  • Open Access
6 Citations
3,075 Views
14 Pages

Risk of Mortality Prediction Involving Time-Varying Covariates for Patients with Heart Failure Using Deep Learning

  • Keijiro Nakamura,
  • Xue Zhou,
  • Naohiko Sahara,
  • Yasutake Toyoda,
  • Yoshinari Enomoto,
  • Hidehiko Hara,
  • Mahito Noro,
  • Kaoru Sugi,
  • Ming Huang and
  • Xin Zhu
  • + 2 authors

25 November 2022

Heart failure (HF) is challenging public medical and healthcare systems. This study aimed to develop and validate a novel deep learning-based prognostic model to predict the risk of all-cause mortality for patients with HF. We also compared the perfo...

  • Article
  • Open Access
2 Citations
3,778 Views
22 Pages

This paper suggests a new approach to evaluate realized covariance (RCOV) estimators via their predictive power on return density. By jointly modeling returns and RCOV measures under a Bayesian framework, the predictive density of returns and ex-post...

  • Article
  • Open Access
16 Citations
7,049 Views
11 Pages

Prediction of Bioluminescent Proteins Using Auto Covariance Transformation of Evolutional Profiles

  • Xiaowei Zhao,
  • Jiakui Li,
  • Yanxin Huang,
  • Zhiqiang Ma and
  • Minghao Yin

19 March 2012

Bioluminescent proteins are important for various cellular processes, such as gene expression analysis, drug discovery, bioluminescent imaging, toxicity determination, and DNA sequencing studies. Hence, the correct identification of bioluminescent pr...

  • Article
  • Open Access
6 Citations
2,801 Views
19 Pages

Improving 3D Digital Soil Mapping Based on Spatialized Lab Soil Spectral Information

  • Zheng Sun,
  • Feng Liu,
  • Decai Wang,
  • Huayong Wu and
  • Ganlin Zhang

3 November 2023

Readily available environmental covariates in current digital soil mapping usually do not indicate the spatial differences between deep soil attributes. This, to a large extent, leads to a decrease in the accuracy of 3D soil mapping with depth, which...

  • Article
  • Open Access
9 Citations
8,660 Views
13 Pages

A Study on the Amplitude Comparison Monopulse Algorithm

  • Minjeong Kim,
  • Daseon Hong and
  • Sungsu Park

7 June 2020

This paper presents two amplitude comparison monopulse algorithms and their covariance prediction equation. The proposed algorithms are based on the iterated least-squares estimation method and include the conventional monopulse algorithm as a specia...

  • Article
  • Open Access
3 Citations
2,580 Views
19 Pages

Multi-Trait Bayesian Models Enhance the Accuracy of Genomic Prediction in Multi-Breed Reference Populations

  • Weining Li,
  • Meilin Zhang,
  • Heng Du,
  • Jianliang Wu,
  • Lei Zhou and
  • Jianfeng Liu

Performing joint genomic predictions for multiple breeds (MBGP) to expand the reference size is a promising strategy for improving the prediction for limited population sizes or phenotypic records for a single breed. This study proposes an MBGP model...

  • Article
  • Open Access
3,685 Views
19 Pages

9 April 2020

An efficient regional hybrid ensemble-variational (EnVar) data assimilation method using the global-ensemble-model-augmented error covariance is proposed and preliminarily tested in this study. This method uses the global ensemble error covariance as...

  • Article
  • Open Access
24 Citations
8,550 Views
27 Pages

3 July 2019

The Hierarchical risk parity (HRP) approach of portfolio allocation, introduced by Lopez de Prado (2016), applies graph theory and machine learning to build a diversified portfolio. Like the traditional risk-based allocation methods, HRP is also a fu...

  • Article
  • Open Access
2 Citations
4,389 Views
21 Pages

28 December 2018

Residues in proteins that are in close spatial proximity are more prone to covariate as their interactions are likely to be preserved due to structural and evolutionary constraints. If we can detect and quantify such covariation, physical contacts ma...

  • Article
  • Open Access
1 Citations
2,252 Views
18 Pages

This paper focuses on the so-called proportional intensity-based software reliability models (PI-SRMs), which are extensions of the common non-homogeneous Poisson process (NHPP)-based SRMs, and describe the probabilistic behavior of software fault-de...

  • Article
  • Open Access
2 Citations
1,948 Views
30 Pages

In-Field Forage Biomass and Quality Prediction Using Image and VIS-NIR Proximal Sensing with Machine Learning and Covariance-Based Strategies for Livestock Management in Silvopastoral Systems

  • Claudia M. Serpa-Imbett,
  • Erika L. Gómez-Palencia,
  • Diego A. Medina-Herrera,
  • Jorge A. Mejía-Luquez,
  • Remberto R. Martínez,
  • William O. Burgos-Paz and
  • Lorena A. Aguayo-Ulloa

Controlling forage quality and grazing are crucial for sustainable livestock production, health, productivity, and animal performance. However, the limited availability of reliable handheld sensors for timely pasture quality prediction hinders farmer...

  • Article
  • Open Access
5 Citations
2,561 Views
21 Pages

Deep Fusion Prediction Method for Nonstationary Time Series Based on Feature Augmentation and Extraction

  • Yu-Lei Zhang,
  • Yu-Ting Bai,
  • Xue-Bo Jin,
  • Ting-Li Su,
  • Jian-Lei Kong and
  • Wei-Zhen Zheng

19 April 2023

Deep learning effectively identifies and predicts modes but faces performance reduction under few-shot learning conditions. In this paper, a time series prediction framework for small samples is proposed, including a data augmentation algorithm, time...

  • Article
  • Open Access
356 Views
31 Pages

26 November 2025

When performing the milling process, it is essential to consider the life estimation and availability of the milling tool to achieve a reliable and optimized result at a lower cost. It is necessary to monitor the tool’s condition during the mil...

  • Article
  • Open Access
13 Citations
5,004 Views
19 Pages

10 October 2021

This paper presents an uncontrolled intersection-passing algorithm with an integrated approach of stochastic model-predictive control and prediction uncertainty estimation for autonomous vehicles. The proposed algorithm is designed to utilize informa...

  • Article
  • Open Access
2 Citations
1,982 Views
17 Pages

Efficient Optimization: Unveiling the Application of Ensemble Learning Combined with the CMA-ES Algorithm in Hydraulic Fracturing Design

  • Jianmin Fu,
  • Xiaofei Sun,
  • Zhengchao Ma,
  • Jiansheng Yu,
  • Qilong Zhang,
  • Bo Hao,
  • Qiang Wang,
  • Hao Hu and
  • Tianyu Wang

21 October 2024

Optimizing fracturing parameters is crucial for enhancing production and reducing costs in oil and gas exploration and development. Effectively integrating geological and engineering parameters for the automated optimization of fracturing design cont...

  • Article
  • Open Access
7 Citations
4,583 Views
16 Pages

Adaptive MPC-Based Lateral Path-Tracking Control for Automatic Vehicles

  • Shaobo Yang,
  • Yubin Qian,
  • Wenhao Hu,
  • Jiejie Xu and
  • Hongtao Sun

For continuously changing road conditions and vehicle operating states, the exactitude of vehicle path tracking has not been secured by model predictive control based on linear lateral stiffness. An amended square root cubature Kalman filter method b...

  • Article
  • Open Access
9 Citations
4,755 Views
25 Pages

21 July 2020

This study evaluates the applicability of numerical weather prediction output supplemented with remote sensing data for near real-time operational estimation of hourly evapotranspiration (ET). Rapid Refresh (RAP) and High-Resolution Rapid Refresh (HR...

  • Article
  • Open Access
95 Views
25 Pages

19 January 2026

This study develops an interpretable, data-driven framework for forecasting daily MDA8 ozone levels in the Beijing–Tianjin–Hebei (BTH) region, integrating statistical diagnostics, XGBoost-based SHAP feature interpretation, and the Tempora...

  • Article
  • Open Access
2,308 Views
24 Pages

Environmental Covariates for Sampling Optimization and Pest Prediction in Soybean Crops

  • Cenneya Lopes Martins,
  • Maiara Pusch,
  • Wesley Augusto Conde Godoy and
  • Lucas Rios do Amaral

Insect pest infestations can vary due to spatial differences in microclimates and food availability within agroecosystems. Covariates can reflect these environmental conditions. This study tested whether using environmental covariates in two-phase sa...

  • Article
  • Open Access
8 Citations
1,761 Views
16 Pages

29 September 2023

This study employed an ensemble machine learning approach to evaluate the effect of bioclimatic covariates on the prediction accuracy of soil total carbon (TC) in the Pannonian biogeoregion. The analysis involved two main segments: (1) evaluation of...

  • Article
  • Open Access
3 Citations
2,076 Views
16 Pages

6 May 2022

The purpose of this study was to provide a procedure for the inclusion of milk spectral information into genomic prediction models. Spectral data were considered a set of covariates, in addition to genomic covariates. Milk yield and somatic cell scor...

  • Article
  • Open Access
28 Citations
5,329 Views
25 Pages

Transferability of Covariates to Predict Soil Organic Carbon in Cropland Soils

  • Tom Broeg,
  • Michael Blaschek,
  • Steffen Seitz,
  • Ruhollah Taghizadeh-Mehrjardi,
  • Simone Zepp and
  • Thomas Scholten

4 February 2023

Precise knowledge about the soil organic carbon (SOC) content in cropland soils is one requirement to design and execute effective climate and food policies. In digital soil mapping (DSM), machine learning algorithms are used to predict soil properti...

  • Article
  • Open Access
4 Citations
2,804 Views
17 Pages

24 March 2023

Jointing Condition-Based Maintenance (CBM) with the Proportional Hazards Model (PHM), asset-intensive industries often monitor vital covariates to predict failure rate, the reliability function, and maintenance decisions. This analysis requires defin...

  • Article
  • Open Access
3 Citations
4,003 Views
18 Pages

Seed Weight as a Covariate in Association and Prediction Studies for Biomass Traits in Maize Seedlings

  • Vlatko Galic,
  • Maja Mazur,
  • Andrija Brkic,
  • Josip Brkic,
  • Antun Jambrovic,
  • Zvonimir Zdunic and
  • Domagoj Simic

20 February 2020

Background: The seedling stage has received little attention in maize breeding to identify genotypes tolerant to water deficit. The aim of this study is to evaluate incorporation of seed weight (expressed as hundred kernel weight, HKW) as a covariate...

  • Article
  • Open Access
6 Citations
4,133 Views
22 Pages

31 March 2022

The tightly coupled navigation system is commonly used in UAV products and land vehicles. It adopts the Kalman filter to combine raw satellite observations, including the pseudorange, pseudorange rate and Doppler frequency, with the inertial measurem...

  • Article
  • Open Access
41 Citations
10,548 Views
32 Pages

An Assessment of Methods and Remote-Sensing Derived Covariates for Regional Predictions of 1 km Daily Maximum Air Temperature

  • Benoit Parmentier,
  • Brian McGill,
  • Adam M. Wilson,
  • James Regetz,
  • Walter Jetz,
  • Robert P. Guralnick,
  • Mao-Ning Tuanmu,
  • Natalie Robinson and
  • Mark Schildhauer

16 September 2014

The monitoring and prediction of biodiversity and environmental changes is constrained by the availability of accurate and spatially contiguous climatic variables at fine temporal and spatial grains. In this study, we evaluate best practices for ge...

  • Article
  • Open Access
35 Citations
5,057 Views
15 Pages

10 November 2018

In situ, diffuse reflectance spectroscopy (DRS) profile soil sensors have the potential to provide both rapid and high-resolution prediction of multiple soil properties for precision agriculture, soil health assessment, and other applications related...

  • Article
  • Open Access
180 Citations
12,656 Views
26 Pages

Improving the Spatial Prediction of Soil Organic Carbon Content in Two Contrasting Climatic Regions by Stacking Machine Learning Models and Rescanning Covariate Space

  • Ruhollah Taghizadeh-Mehrjardi,
  • Karsten Schmidt,
  • Alireza Amirian-Chakan,
  • Tobias Rentschler,
  • Mojtaba Zeraatpisheh,
  • Fereydoon Sarmadian,
  • Roozbeh Valavi,
  • Naser Davatgar,
  • Thorsten Behrens and
  • Thomas Scholten

29 March 2020

Understanding the spatial distribution of soil organic carbon (SOC) content over different climatic regions will enhance our knowledge of carbon gains and losses due to climatic change. However, little is known about the SOC content in the contrastin...

  • Article
  • Open Access
23 Citations
3,180 Views
18 Pages

Prediction of Soil Organic Carbon at Field Scale by Regression Kriging and Multivariate Adaptive Regression Splines Using Geophysical Covariates

  • Daniela De Benedetto,
  • Emanuele Barca,
  • Mirko Castellini,
  • Stefano Popolizio,
  • Giovanni Lacolla and
  • Anna Maria Stellacci

4 March 2022

Knowledge of the spatial distribution of soil organic carbon (SOC) is of crucial importance for improving crop productivity and assessing the effect of agronomic management strategies on crop response and soil quality. Incorporating secondary variabl...

  • Article
  • Open Access
33 Citations
4,883 Views
17 Pages

Comparing Machine Learning Models and Hybrid Geostatistical Methods Using Environmental and Soil Covariates for Soil pH Prediction

  • Panagiotis Tziachris,
  • Vassilis Aschonitis,
  • Theocharis Chatzistathis,
  • Maria Papadopoulou and
  • Ioannis (John) D. Doukas

In the current paper we assess different machine learning (ML) models and hybrid geostatistical methods in the prediction of soil pH using digital elevation model derivates (environmental covariates) and co-located soil parameters (soil covariates)....

  • Feature Paper
  • Article
  • Open Access
3,255 Views
15 Pages

19 February 2022

Gene-based rare variant association studies (RVASs) have low power due to the infrequency of rare variants and the large multiple testing burden. To correct for multiple testing, traditional false discovery rate (FDR) procedures which depend solely o...

  • Article
  • Open Access
10 Citations
4,371 Views
22 Pages

Prediction of Feed Efficiency and Performance-Based Traits in Fish via Integration of Multiple Omics and Clinical Covariates

  • Tim Young,
  • Olivier Laroche,
  • Seumas P. Walker,
  • Matthew R. Miller,
  • Paula Casanovas,
  • Konstanze Steiner,
  • Noah Esmaeili,
  • Ruixiang Zhao,
  • John P. Bowman and
  • Jane E. Symonds
  • + 5 authors

15 August 2023

Fish aquaculture is a rapidly expanding global industry, set to support growing demands for sources of marine protein. Enhancing feed efficiency (FE) in farmed fish is required to reduce production costs and improve sector sustainability. Recognising...

  • Article
  • Open Access
5 Citations
5,053 Views
15 Pages

18 March 2022

We propose a functional time series method to obtain accurate multi-step-ahead forecasts for age-specific mortality rates. The dynamic functional principal component analysis method is used to decompose the mortality curves into dynamic functional pr...

  • Article
  • Open Access
3 Citations
2,259 Views
23 Pages

Assessing the Role of Environmental Covariates and Pixel Size in Soil Property Prediction: A Comparative Study of Various Areas in Southwest Iran

  • Pegah Khosravani,
  • Majid Baghernejad,
  • Ruhollah Taghizadeh-Mehrjardi,
  • Seyed Roohollah Mousavi,
  • Ali Akbar Moosavi,
  • Seyed Rashid Fallah Shamsi,
  • Hadi Shokati,
  • Ndiye M. Kebonye and
  • Thomas Scholten

18 August 2024

(1) Background: The use of multiscale prediction or the optimal scaling of predictors can enhance soil maps by applying pixel size in digital soil mapping (DSM). (2) Methods: A total of 200, 50, and 129 surface soil samples (0–30 cm) were colle...

  • Article
  • Open Access
15 Citations
4,237 Views
17 Pages

Digital Mapping of Soil Organic Carbon Using Machine Learning Algorithms in the Upper Brahmaputra Valley of Northeastern India

  • Amit Kumar,
  • Pravash Chandra Moharana,
  • Roomesh Kumar Jena,
  • Sandeep Kumar Malyan,
  • Gulshan Kumar Sharma,
  • Ram Kishor Fagodiya,
  • Aftab Ahmad Shabnam,
  • Dharmendra Kumar Jigyasu,
  • Kasthala Mary Vijaya Kumari and
  • Subramanian Gandhi Doss

27 September 2023

Soil Organic Carbon (SOC) is a crucial indicator of ecosystem health and soil quality. Machine learning (ML) models that predict soil quality based on environmental parameters are becoming more prevalent. However, studies have yet to examine how well...

  • Proceeding Paper
  • Open Access
2,345 Views
11 Pages

In this paper, we want to find a continuous function fitting through the discrete covariance sequence generated by a stationary AR process. This function can be determined as soon as the Yule–Walker equations are found. The procedure consists of two...

  • Article
  • Open Access
10 Citations
3,225 Views
18 Pages

A Multiscale Cost–Benefit Analysis of Digital Soil Mapping Methods for Sustainable Land Management

  • Dorijan Radočaj,
  • Mladen Jurišić,
  • Oleg Antonić,
  • Ante Šiljeg,
  • Neven Cukrov,
  • Irena Rapčan,
  • Ivan Plaščak and
  • Mateo Gašparović

26 September 2022

With the emergence of machine learning methods during the past decade, alternatives to conventional geostatistical methods for soil mapping are becoming increasingly more sophisticated. To provide a complete overview of their performance, this study...

  • Article
  • Open Access
161 Citations
13,840 Views
20 Pages

Using Machine Learning Algorithms to Estimate Soil Organic Carbon Variability with Environmental Variables and Soil Nutrient Indicators in an Alluvial Soil

  • Kingsley JOHN,
  • Isong Abraham Isong,
  • Ndiye Michael Kebonye,
  • Esther Okon Ayito,
  • Prince Chapman Agyeman and
  • Sunday Marcus Afu

2 December 2020

Soil organic carbon (SOC) is an important indicator of soil quality and directly determines soil fertility. Hence, understanding its spatial distribution and controlling factors is necessary for efficient and sustainable soil nutrient management. In...

  • Article
  • Open Access
880 Views
24 Pages

3 October 2025

Soil organic matter (SOM) is essential for ecosystem health and agricultural productivity. Accurate prediction of SOM content is critical for modern agricultural management and sustainable soil use. Existing digital soil mapping (DSM) models, when pr...

  • Article
  • Open Access
4 Citations
3,762 Views
14 Pages

Covariables of Soil-Forming Factors and Their Influence on pH Distribution and Spatial Variability

  • Pedro Yescas-Coronado,
  • Miguel Ángel Segura-Castruita,
  • Arturo Moisés Chávez-Rodríguez,
  • Juan Florencio Gómez-Leyva,
  • Aldo Rafael Martínez-Sifuentes,
  • Osvaldo Amador-Camacho and
  • Raúl González-Medina

12 December 2022

The objectives of this study were to identify and rank the covariables of soil-forming factors that affect the distribution and spatial variability of pH in an agricultural area and to obtain a predictive map of soil pH. Samples of topsoil were obtai...

  • Article
  • Open Access
9 Citations
3,955 Views
18 Pages

Leveraging Important Covariate Groups for Corn Yield Prediction

  • Britta L. Schumacher,
  • Emily K. Burchfield,
  • Brennan Bean and
  • Matt A. Yost

Accurate yield information empowers farmers to adapt, their governments to adopt timely agricultural and food policy interventions, and the markets they supply to prepare for production shifts. Unfortunately, the most representative yield data in the...

  • Article
  • Open Access
2,138 Views
16 Pages

Leveraging Neural ODEs for Population Pharmacokinetics of Dalbavancin in Sparse Clinical Data

  • Tommaso Giacometti,
  • Ettore Rocchi,
  • Pier Giorgio Cojutti,
  • Federico Magnani,
  • Daniel Remondini,
  • Federico Pea and
  • Gastone Castellani

5 June 2025

This study investigates the use of Neural Ordinary Differential Equations (NODEs) as an alternative to traditional compartmental models and Nonlinear Mixed-Effects (NLME) models for drug concentration prediction in pharmacokinetics. Unlike standard m...

  • Proceeding Paper
  • Open Access
1 Citations
2,674 Views
9 Pages

On the Family of Covariance Functions Based on ARMA Models

  • Till Schubert,
  • Jan Martin Brockmann,
  • Johannes Korte and
  • Wolf-Dieter Schuh

In time series analyses, covariance modeling is an essential part of stochastic methods such as prediction or filtering. For practical use, general families of covariance functions with large flexibilities are necessary to model complex correlations...

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