Document classification is an area of great importance for which many classification methods have been well developed. However, most of these methods cannot generate time-dependent classification rules. Thus, they are not the best choices for problems with time-varying structures. To address...

The outbreak of COVID-19 in China during the Spring Festival of 2020 is an unprecedented event. Its impact has spread throughout the country and around the world. In order to explore the impact of the epidemic on China's economy, this paper starts with the analysis of the daily railway passenger...

The spatio-temporal evolution and the spatial effect analysis of land ecological efficiency (abbrev. eco-efficiency) are key to achieving high-quality economic, environmental and social development. It is also important to optimize territorial space layout and coordinate urbanization development...