The provided text is about hotel room division management. It includes references to books and journals related to topics such as wavelength division multiplexing over plastic optical fiber technology, extending sensing range using frequency-division multiplexing and in-line EDFAs, and exposure to room light affecting melatonin onset. The text also mentions creating an antibacterial with in vivo efficacy and the current situation and countermeasures for preventing and controlling nosocomial infections in medical division. Additionally, it provides information on a rooms division manager's responsibilities and recreational activities at a hotel.