IEEE Consumer Electronics Magazine - September/October 2020 - 83

Figure 3. Implementation and overall operation of the proposed system.

with each other by using a representational state
transfer API. Tensorflow, a machine learning
library, is used for juice ingredient learning.
The learned data are stored in the MEC
server to reduce computational complexity and
to enable rapid distribution. It is possible to
quickly search for the juice recipes among the
learned data stored in the MEC server database.
To use the chatbot service, users search for the
name of our system, BLUE-FI, in the user search
window of the messenger platform. When a user
registers for the proposed chatbot service, the
proposed system performs an authentication
process between the user and the chatbot service. Only authorized users both obtain access
to the chatbot service and request the juice recipe recommendation service. The system also
protects user privacy because only a registered
user can access his or her own information.
In addition, to enhance the security between the
user and the MEC server, the proposed system
uses an access control list, which allows only

September/October 2020

authorized users to access the local MEC server.
After the registration process, the chatbot sends
a greeting message to the users in the chat window. The user's joining process is complete at
this time.

Text-Based Recipe Recommendation
When a user inputs a juice name or sentence
in the chat window of the KakaoTalk messenger
platform to initiate a search, the KakaoTalk messenger server delivers a JSON-format message to
the proposed MEC server. The tag included in
the received message is confirmed by the MEC
server.
After verifying the text tag, the MEC server
extracts the meaning of the message through
morphological analysis. The morphological
analysis function of the MEC server extracts
the meaning and retrieves a recipe from the
database.
The retrieved recipe is sent to the chatbot
server in the JSON format. Then, the chatbot

83



IEEE Consumer Electronics Magazine - September/October 2020

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