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With the increasing scale and complexity of IoT swarm intelligence applications, data security and privacy protection have become important factors restricting the development of IoT swarm intelligence. This paper explores the key technologies of data security and privacy protection in IoT swarm intelligence to improve the security and trustworthiness of IoT swarm intelligence applications. Using the method of literature research and empirical analysis, the data security and privacy protection in the swarm intelligence of the Internet of Things are deeply analyzed and studied. The data security risks in the Internet of Things are identified and classified, and the corresponding security requirements are proposed. According to different security requirements, a series of data security and privacy protection technologies are proposed. Finally, through empirical research, the effectiveness and feasibility of the proposed key technologies are verified. The research results show that these technologies and methods can provide guarantees for the security and trustworthiness of IoT swarm intelligence applications, contributing to the healthy development of the IoT industry. However, further research and improvements are still needed to address new security and privacy challenges that continue to emerge. [ABSTRACT FROM AUTHOR]

This study analyzed the effects of the announcement and publication of the 2019 Public Charge Rule on participation of the special supplemental nutrition program for women, infants, and children (WIC) among pregnant immigrants. A difference-in-differences approach was used to analyze the changes in prenatal WIC participation before and after the 2019 Public Charge Rule announcement and publication among immigrants relative to US natives. We identified 17,623,683 live singletons born in a hospital from 2015 to 2019. Compared to US natives, the odds of prenatal WIC participation among immigrants were 11.4% lower after the 2019 Public Charge Rule announcement, and 19% lower after the final rule was published. The results of this study suggest that pregnant immigrants may decide not to participate in the WIC program due to the fear of jeopardizing their immigration status after the announcement and publication of the 2019 Public Charge Rule. [ABSTRACT FROM AUTHOR]

We propose an efficient method for determining the position of the output plane of a phase object, which is registered by a lens system in the presence of a defocusing effect. The method involves the simultaneous employment of 2D diffraction maps of the diffracted wave constructed for its forward and inverse directions of propagation relative to the object output plane. We show that the resultant diffraction pattern obtained for both cases of the wave propagation appears as the two opposite directed diffraction cones with a special narrow zone between them. Within such a zone, there are particular regularities in the behavior of the intensity and phase shift of the wave. The knowledge of these regularities allows one to determine the position of the object output plane with micrometer accuracy, even when a single angle of laser probing is employed. [ABSTRACT FROM AUTHOR]