Degenerative arthritis is a common joint disease that affects many elderly people and is typically diagnosed through radiography. However, the need for remote diagnosis is increasing because knee pain and walking disorders caused by degenerative arthritis make face-to-face treatment difficult. This study collects three-dimensional joint coordinates in real time using Azure Kinect DK and calculates 6 gait features through visualization and one-way ANOVA verification. The random forest classifier, trained with these characteristics, classified degenerative arthritis with an accuracy of 97.52%, and the model's basis for classification was identified through classification algorithm by features. Overall, this study not only compensated for the shortcomings of existing diagnostic methods, but also constructed a high-accuracy prediction model using statistically verified gait features and provided detailed prediction results.

This study aimed to investigate how two novice teachers in elementary schools conceptualized and developed their practical knowledge about English teaching. They provided their narratives about their teaching six times over the spring semester of 2019. Their narratives were recorded and transcribed. Two researchers examined the transcription to investigate what prior knowledge they had and how they developed their practical knowledge. It was found that their practical knowledge had constantly changed and developed. When they started teaching English, they had their own knowledge on English teaching, which seemed to come from their previous English learning experience and from their study on teaching English. As they applied these knowledge to their own teaching situations, they encountered many problems. The main situations that shaped their practical knowledge were 1) students' level of achievement, 2) level differences among students, 3) teacher status (classroom teacher or English specialist teacher), and 4) colleagues. While coping with those problems, they added new practical knowledge or modified the knowledge they had. The findings provided several implications on pre-service and novice teacher training.