Research Progress on Influencing Factors of Refractive Error in Preschool Children

Preschool is the key period of children's visual function development, which is called the "critical period of visual development plasticity". Any abnormal stimulus during this period can have an adverse impact on children's vision. Ametropia is the main cause of poor vision in preschool children. There are many reasons for ametropia. This paper reviews the influencing factors of ametropia in preschool children in recent years, which are classified into three aspects: demographic factors, physiological factors, and lifestyle factors

Vehicle Rollover Stability And Path Planning In Adas Using Model Predictive Control

Advanced Driver Assistance Systems (ADAS) have been developed in recent years to significantly improve safety in driving and assist driver’s response in extreme situations in which quick decisions and maneuvers are required. Common features of ADAS in modern vehicles include automatic emergency braking (AEB), lane keeping assistance (LKA), electric stability control (ESC), and adaptive cruise control (ACC). While these features are developed primarily based on sensor fusion, image processing and vehicle kinematics, the importance of vehicle dynamics must not be overlooked to ensure that the vehicle can follow the desired trajectory without inducing any instability. In many extreme situations such as object avoidance, fast maneuvering of vehicles with high center of gravity might result in rollover instability, an event with a high fatality rate. It is thus necessary to incorporate vehicle dynamics into ADAS to improve the robustness of the system in the path planning to avoid collision with other vehicles or objects and prevent vehicle instability. The objectives of this thesis are to examine the efficacy of a vehicle dynamics model in ADAS to simulate rollover and to develop an active controller using Model Predictive Control (MPC) to manipulate the front-wheel steering and four-wheel differential braking forces, which are related to active steering as well as dynamic stability control for collision avoidance. The controller is designed using the model predictive control approach. A four degree-of-freedom vehicle model is simulated and tested in various scenarios. According to simulation results, the vehicle controller by the MPC controller can track the predicted path within error tolerance. The trajectories used in different simulation scenarios are generated by the MPC controller

A Study of Lu Xun's "Blessing" Appellatives and the Implications for Chinese Language Teaching

Lu Xun, as the founder of modern Chinese literature, is known for his profound and sharp language style. Although there are different views on whether and how to teach Lu Xun's works in Chinese as a Foreign Language (CFL) teaching circles, the fact that Lu Xun's works are most frequently included in Chinese language textbooks is enough to emphasize his central position. From the perspective of sociolinguistics, this paper takes the epithets in Lu Xun's Blessing as the object of study, and employs exhaustive statistics and other research methods to systematically analyze the epithets in Blessing. It is found that Blessing contains 54 predicates, which are categorized into two major categories of locution and expressive function and seven subcategories of occupational title and honorific title on the basis of Li Mingjie's classification of predicates. From the study of the predicates in Blessing, we can see that they are characterized by the wide distribution and different colors of predicative elements, and the phenomenon of heteronymity and homonymity, and so on. Finally, from the perspective of the "Three Teachings" (teachers, teaching materials, and teaching methods), the study provides insights for Chinese language teaching and promotes Chinese language learners to better understand the development of Chinese society through the study of Lu Xun's epithets