重庆市农民工市民化的成本约束与制度创新

户籍制度改革是中国城乡二元制度改革、缩小二元差距的牛鼻子,以户籍制度改革推动社会制度改革是中国未来三十年社会制度改革的重心。重庆市推进以农民工户籍制度改革为切入的统筹城乡综合配套改革,是中国社会制度变革的一个试点和示范。但是城乡二元制度是一个相互关联的巨复系统,制度之间相互约束;同时制度改革隐含巨大的改革成本。重庆市一方面要循序推进农民工户籍制度改革,同时在已有土地制度、农村养老保障制度、农村医疗保障制度、农村教育制度等系列改革基础上,还应推出农村退休养老保障制度、农村承包地退休退出制度、农村住房保障制度等关键制度,为农民工市民化提供必要的资金支持,削弱和消除因制度原因造成的农民工市民化心理障碍。     

Residence after retirement: A review and bibliometric analysis

This study reviews the literature on the residence after retirement via Systematic Literature Network Analysis, which consists of the systematic literature review and bibliometric network analysis. There are three research questions, including (1) what the most recent studies are on the residence after retirement, (2) Who the most significant authors, documents, and sources are in residence after retirement, and (3) whether the extant research structure could guide the future agenda for the residence after retirement. Based on the systematic literature review, this study extracts 50 publications from the Scopus database by keyword, document type, source type, publication period, language, and subject area relevant to the residence after retirement. This study analyzes data employing Nvivo, VOSviewer, and SciMAX. The clusters of authors, countries, keywords, documents, and sources linked with relevant studies on the residence after retirement are according to the co-authorship (1) author, (2) country/territory, (3) keyword, and (4) document. Skitmore, M., Xia, B., Buys, I., Hu, X., Hu, Y., and Chen, Q. who the most influential authors are in residence after retirement. The themes of aging, continuing care retirement community, retirement village, and their associated keywords contribute to future research on the residence after retirement.     

采用FFT-PSO策略的多约束稀疏阵天线方向图综合

采用稀疏布阵的相控阵测控天线，阵元等幅激励时的阵列峰值副瓣电平无法满足指标要求。在考虑天线增益、半功率波束宽度等指标约束时设计了合适的适应度函数，并基于粒子群算法(PSO)对阵元激励幅度进行优化以降低天线副瓣电平。同时，分析了等间距栅格平面阵列天线方向图与离散傅里叶变换的关系，采用快速傅里叶变换(FFT) 降低了阵列方向图计算复杂度。仿真结果表明，该方法可有效降低峰值副瓣电平和计算复杂度。