Please refer to the schedule below as POSTECH homepage will be inaccessible due to the Layer 4 Switch upgrade.1. Date and time of operation: 20:00 - 00:00 on Monday, July 20, 2020– The POSTECH homepage will be unavailable for 5 – 10 minutes within the above time frame.2. Task: OS upgrade for Layer 4 Switch– Wired and wireless internet connection service (Excludes residential areas)– Integrated login system, Hemos site, POSTECH Website, sDisk, webmail, DNS, Engram– POVIS, Mobile POVIS, LMS, PIPA, VPN3. Contact: Information and Communication Services (hemos@postech.ac.kr, 279-2516)