The article presents a model-free online learning control (MFOLC) scheme for attitude tracking in quadrotor UAVs, addressing challenges such as uncertain inertia parameters, external disturbances, and sensor noise. The proposed control method, which does not require precise inertial parameters, ensures uniformly ultimately bounded stability and demonstrates effectiveness through simulations and real-world experiments. The research highlights the advantages of MFOLC over traditional methods in terms of computational efficiency and robustness, making it suitable for small quadrotors with limited processing power.

The study investigates the motivations, knowledge, efficacy, and participation related to second screening in China using an O-S-O-R model. It highlights how second screening activities, driven by motivations such as surveillance and utility, influence political knowledge, internal political efficacy, and political participation among Chinese citizens. The research underscores the unique context of China's authoritarian regime, where media is heavily controlled, and second screening offers a platform for alternative information and political expression. The findings suggest that second screening can enhance political knowledge and efficacy, although direct political participation may be limited due to the political environment.

The study investigates the role of CDC42 in lung tumorigenesis using a Kras-driven lung cancer mouse model. It identifies both tumor-promoting and tumor-suppressive functions of CDC42 in different lung cell types. CDC42 promotes tumor growth in alveolar epithelial cells while preventing tumor formation in bronchioles. The research highlights the cell type-specific roles of CDC42 in lung cancer and its correlation with SP-A expression in human lung adenocarcinoma. The findings suggest that CDC42's function as an oncogene or tumor suppressor is lineage-dependent.