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result(s) for
"extended change vector analysis"
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Updating of Land Cover Maps and Change Analysis Using GlobeLand30 Product: A Case Study in Shanghai Metropolitan Area, China
2020
Accurate land cover mapping and change analysis is essential for natural resource management and ecosystem monitoring. GlobeLand30 is a global land cover product from China with 30 m resolution that provides reliable data for many international scientific programs. Few studies have focused on systematically implementing this global land cover product in regional studies. Therefore, this paper presents an object-based extended change vector analysis (ECVA_OB) and transfer learning method to update the reginal land cover map using GlobeLand30 product. The method is designed to highlight small and subtle changes through the concept of uncertain area analysis. Updating is carried out by classifying changed objects using a change-detection-based transfer learning method. Land cover changes are analyzed and the factors affecting updating results are explored. The method was tested with data from Shanghai, China, a city that has experienced significant changes in the past decade. The experimental results show that: (1) the change detection and classification accuracy of the proposed method are 83.30% and 78.77%, respectively, which are significantly better than the values obtained for the multithreshold change vector analysis (MCVA) and the multithreshold change vector analysis and support vector machine (MCVA + SVM) methods; (2) the updated results agree well with GlobeLand30 2010, especially for cultivated land and artificial surfaces, indicating the effectiveness of the proposed method; (3) the most significant changes over the past decade in Shanghai were from cultivated land to artificial surfaces, and the total area containing artificial surfaces in Shanghai increased by about 55% from 2000 to 2011. The factors affecting the updating results are also discussed, which be attributed to the classification accuracy of the base image, extended change vector analysis, and object-based image analysis.
Journal Article
Data-driven modeling of imported malaria in Morocco and the impact of population migration
2026
Malaria remains a very critical health-threatening issue worldwide, and increasingly, migration is viewed as a cause of re-emergence in malaria-free zones. This study proposes a data-driven, deterministic compartmental model that explicitly accounts for human immigration when modeling malaria transmission from humans to mosquito populations. The human host is categorized into susceptible, asymptomatic, infected, and recovered classes, while the vector population is stratified into susceptible and infected compartments. The paper presents a rigorous mathematical analysis to prove the positivity and uniqueness of solutions, and further demonstrates that the model only admits a globally stable endemic equilibrium. Using Morocco as a case study, key parameters are estimated using three complementary methods: least-squares fit, Extended Kalman Filter, and Long Short-Term Memory (LSTM) neural networks, which where applied to imported malaria data from 1990 through 2023. To identify the best control measures to prevent the possible re-establishment of malaria in Morocco, we investigate an optimal control problem that includes awareness, prophylactic treatment, treatment of the infected population, and vector control with insecticide. The goal is to identify the optimal effectiveness of these controls. Numerical results show a significant reduction in human and vector infections through a combination of control strategies, thus underscoring the importance of surveillance and control policies that account for migration. Therfore, it serves as a practical, flexible framework to analyze imported malaria and other vector-borne diseases across similarly high-mobility areas.
Journal Article
Statistical Modeling of Health Effects on Climate-Sensitive Variables and Assessment of Environmental Burden of Diseases Attributable to Climate Change in Nepal
by
Joshi, Rajesh Dhoj
,
Shrestha, Srijan Lal
,
Shrestha, Niraj
in
Analysis
,
Applications of Mathematics
,
Cardiovascular disease
2017
An ecological time-series study is conducted to quantify health-effect coefficients associated with climate-sensitive variables namely temperature, rainfall, relative humidity, and wind speed and estimate environmental burden of diseases attributed to temperature as the main climatic variable together with climate change in Nepal. The study is based upon daily data of climate-sensitive variables and hospitalizations collected for 5 years between 2009 and 2014. Generalized linear model is used to estimate health-effect coefficients accounting distributed lag effects. Results show 3.08%, 10.14%, and 3.27% rise in water-borne, vector-borne, and renal disease hospitalizations, respectively, and 3.67% rise in water- and vector-borne disease deaths per 1 °C rise in average temperature. Similarly, 2.45% and 1.44% rise in heart disease hospitalization and all-cause mortality, respectively per 1 °C rise in absolute difference of average temperature with its overall average (20 °C). The computed attributable fractions are 0.3759, 0.6696, 0.2909, and 0.1024 for water-borne, vector-borne, renal, and heart disease hospitalizations, respectively, and 0.0607 and 0.4335 for all-cause mortality and disease-specific mortality of water- and vector-borne diseases, respectively. The percent change in attributable burdens due to climate change are found to be 4.32%, 4.64%, 7.20%, and −2.29% for water-borne, vector-borne, renal, and heart disease hospitalizations, respectively, and −1.39% and 6.55% for all-cause deaths and water-borne and vector-borne disease deaths, respectively. In conclusion, climate-sensitive variables have significant effects on many major health burdens in Nepal. In the context of changing climatic scenarios around the world including that of Nepal, such changes are bound to affect the health burden of Nepalese people.
Journal Article
Adaptive Control of Parabolic PDEs
2010
This book introduces a comprehensive methodology for adaptive control design of parabolic partial differential equations with unknown functional parameters, including reaction-convection-diffusion systems ubiquitous in chemical, thermal, biomedical, aerospace, and energy systems. Andrey Smyshlyaev and Miroslav Krstic develop explicit feedback laws that do not require real-time solution of Riccati or other algebraic operator-valued equations. The book emphasizes stabilization by boundary control and using boundary sensing for unstable PDE systems with an infinite relative degree. The book also presents a rich collection of methods for system identification of PDEs, methods that employ Lyapunov, passivity, observer-based, swapping-based, gradient, and least-squares tools and parameterizations, among others.
Including a wealth of stimulating ideas and providing the mathematical and control-systems background needed to follow the designs and proofs, the book will be of great use to students and researchers in mathematics, engineering, and physics. It also makes a valuable supplemental text for graduate courses on distributed parameter systems and adaptive control.