IEEE Consumer Electronics Magazine - November/December 2021 - 42

Smart Cities
Table 1. Detailed Comparison of Key Features.
Works
Temperature
measurement
Al-Mutairi et al.14
Maopu et al.15
Rane16
Arkojyoti17
This Work
YES
YES
YES
YES
YES
Alcohol
spray
NO
NO
NO
NO
YES
Connect
database
YES
YES
YES
NO
YES
Figure 6. (a) First step is hands disinfection by
automatic spraying alcohol. (b) Second step is relying
on faculty/staff/student ID card for identity login. (c)
Third step is taking forehead temperature and upload
the forehead temperature data at the same time.
RESULTS AND DISCUSSIONS
In Taiwan, a citizen is required to measure
their temperature and spray alcohol or hand
sanitizer for disinfection purposes before they
enter a building. Our system is placed in front of
the entrance where it is outdoors to prevent people
with a fever from entering inside before any
temperature is taken. Users can efficiently operate
the system by following the instructions
shown on the panel as follows. First, the system
performs hand disinfection for the user. When
the user puts their hands in front of the ultrasonic
sensor at a distance <7 cm, alcohol will be
sprayed on the hands for disinfection, as shown
in Figure 6(a). Then, the user taps their ID card
on the reader for login, as shown in Figure 6(b).
The user then moves their forehead close to the
sensor to proceed with temperature measurement,
as shown in Figure 6(c). Particularly, the
system will turn on an LED light to indicate that
the subject is already in the detection range
when the forehead of the user is close enough to
the sensor. After the measurement is completed,
the system with a text-to-speech function will
read aloud the measured forehead temperature.
42
If the temperature exceeds 37.5C, the system
will also perform an audible warning. Under a
worker's supervision, the user with a fever will
have to wait for 10 minutes and then take the
test again. If their forehead temperature is still
over 37.5C, the user will not be allowed to enter
the building. There are four campus epidemicprevention
devices in YunTech, and about
10,000 people used these every week during the
first three months of the semester in 2020.
Note that those using the machine must still
wear a mask in order to reduce droplet infection.
Due to the spread of COVID-19 worldwide,
some governments in Europe have required that
people need to wear a mask when entering and
leaving public places. It will take the European
time to get used to wearing a mask as a natural
epidemic-prevention measure. However, this
policy may cause cultural conflicts between the
Europeans' concept of wearing masks. Wang
et al.11 have indicated a study of whether Europeans
wearing a mask have some physical and
mental stress. In this study, they indicated no
significant difference in physical and mental
stress. Therefore, wearing a mask will be one of
the ways to prevent an epidemic in future.
During the epidemic-prevention period, the
whole world concerns all aspects of prevention
and ways to improve products such as masks
and systems of delivery or identification. Kalavakonda
et al.12 created the smart mask. The
design of the mask provided easy-to-use and
low-cost protection. Selamneni et al.13 used a
fabricated sensor to utilize as a pressure sensor
for smart floor application. This work can give
feedback to android applications to prevent and
manage the flow of people in the area.
The detailed comparison of key features is
illustrated in Table 1. In these relative works,
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