Operating systems lab is an "SW StarLab", designated and supported by Korea Government for its software research excellence. We research on next-generation computer systems: 1) intelligent clouds and 2) network virtualization system. Intelligent clouds develop new ways of providing performance guarantees for scalable big data processing and blockchain-based IoT security. Network virtualization builds end-to-end SDNbased technologies including ultra-low latency edge computing that are critically needed for 5G services and beyond.