Abstract
In this paper, distance classes were practiced in order to realize a collaborative class which included discussions between middle schools of Japan and South Korea. For the sake of these classes, three venues which were two points for each students and the chair man/translator's point were connected using DVTS which enabled high quality video/audio transmission. In these classes, after the exchange type class the collaborative class was executed through the discussion about using the electric power energy and dreaming electric power generation as the theme "Let's think about the future energy beyond the sea". Then the collaborative class, the network traffic, the quality of transmitted movie, the environment for assisting communication and the transmission delay were evaluated. Consequently, the following results were obtained. Firstly, distance class was practiced using the high quality movie and the translation chat system, the Web-GIS material between middle schools of Japan and South Korea. About the subjective evaluation, this class work was obtained high score of the availability by learners and teachers, observation students. Then between Fukuoka and Nagasaki, stable connection was enabled but the network band width was not acquired enough between Fukuoka and Gwangju. About picture quality evaluation for the face-to-face type, the value of PQR was from 2.4 to 3.4 between Fukuoka and Nagasaki, and the value of PQR was from 9.1 to 13.5 between Fukuoka and Gwangju. Additionally, the translation chat system and the Web-GIS material were effective for this class. Lastly, influence of the transmission delay was without particular distinction because of using the translator and the arrangement of speaking.
