System analysis and design of library information system in the era of big data 并列题名：System analysis and design of library information system in the era of big data 并列题名：Innovation and development of library service system in the era of big data Innovation and development of library service system in the era of big data Analysis and design of military information system Legal protection of financial information in the era of big data Research on the construction of personal information protection system in the era of big data 并列题名：Legal protection of financial information in the era of big data Practice of analysis and design of management information system based on DW technology Analysis and application of public opinion in the era of big data