Research on the method and application of sparse and low-rank decomposition of matrix 并列题名：Research on the method and application of sparse and low-rank decomposition of matrix Research on theory and method and application of synthetic risk analysis on flood disaster Research on the thoery and application of smooth transition autoregressive mode research on the legal regulation of abusing dominant market position in internet Study on the preparation and application of Chinese national income accounting matrix 并列题名：Study on the preparation and application of Chinese national income accounting matrix