Building a Secure Network during the COVID-19

Our university updated its network to improve security and network stability in 2021. The new network has introduced UTM (Unified Threat Management) with the necessary licenses and bandwidth to allow all members to make VPN (Virtual Private Network) connections for remote work and remote lectures. The UTM appliance is equipped with security functions such as DLP in addition to access control by IP address. In order to support HyFlex (Hybrid-Flexible) lessons, we added wireless access points to each lecture room, but it did not work well. If the channel was not adjusted, it was unable to connect temporarily in a classroom where many devices trying to connect. However, by adjusting the channel and output, the WiFi can be used comfortably. In addition, as the opportunities to use the network for classes and on-campus events increased, it was difficult to adjust the schedule for stopping the network and replacing equipment, and it was difficult to update the network. In this paper, we will report what kind of design was done to build a highly secure and highly available network within a limited budget, and what kind of difficulties were encountered in the construction work. © 2022 ACM.

The Lecture in Our University During COVID-19 Pandemic

COVID-19 has changed our daily lives dramatically;temporary lectures moved online to address the pandemic are now no longer temporary but a common occurrence. In Japan, COVID-19 cases have fluctuated repeatedly and a state of emergency has been declared over and over again. No one knows when we will return to pre-pandemic life. In this prolonged situation, social life is gradually changing to a lifestyle with COVID-19. University life has also been changed. This paper reports online lectures in our university and their changes and now. © 2022 ACM.

Evaluation for Biorhythm of Japanese University Students during COVID-19 Pandemic Using Wearable Device

This study focused on university students' sleep and circadian rhythms during the COVID-19 pandemic by monitoring the lowest point of circadian rhythms based on heart rate during nighttime sleep. Five healthy male university students wore a wristwatch-type wearable device for approximately one month. We measured the heart rate and monitored the lowest point of the circadian rhythm during nighttime sleep. The average minimum time of the estimated circadian rhythm was 5:48:06\pm 0:50:18 (five subjects). The standard deviation (SD) of the lowest point time was 1:46:41\pm 0:46:25 (five subjects). The SD of the lowest point time of two subjects was two and three hours, implying that the self-restraint imposed by the COVID-19 pandemic caused a disturbance in the body clock. Our method of monitoring circadian rhythms by measuring the heart rate during nighttime sleep with a wearable device enables individuals to monitor their circadian rhythm status, which is expected to contribute to health care for people living with the COVID-19 pandemic, shift workers, business workers, and athletes. © 2022 IEEE.