Hospitalized patients who need transfer for a diagnostic examination or rehabilitation therapy during hospitalization, and have a risk of hypoxemia during transfer will be enrolled in this trial. The subjects will be provided with a portable oximeter and a smart-phone which application for monitoring is installed, and oxygen saturation and pulse rate will be checked in real time during transfer. The collected data will be transferred to cloud system via Iot network, and the transmitted data will be monitored in real time via monitoring equipment in the (Patient-hospitalized) ward. If there is a risk, the alarm system is activated so that the medical team is able to check risk factor and manage it immediately.
All the risk factors and severity will be collected during transfer, also these are checked whether the monitoring system and the data transmission system work properly or not, the time from detecting risk factor to medical response, the composition of medical staffs who responding to alarmed risk factors and improvement of the subjects.
Pilot study will be conducted with 20 subjects in Asan medical center. In pilot study, monitoring machines (HR, SpO2 monitor) commonly used in wards or hospitals will be used to verify the stability of oximeter used in this study and the developed risk detection system.