Study of improvement of educational exchange support using international satellite network

为了支持语言学习、科学技术和文化等各个教育领域的国际交流，必须改进和顺利管理现有系统。从实用的角度来看，也需要架构。本研究旨在为拥有大学间卫星网络“空间协作系统(SCS)”的日本大学提供国际教育交流的基础设施，以构建下一代高等教育的国际网络。为了实现这一目标，我们进行了以下研究：(1)国际交换与开发工具的实验，(2)数据传输网络体系结构的仿真。(1)工具的国际交换与开发实验我们利用多颗卫星进行了…之间的国际连接实验更多的是泰国拉德克拉邦理工学院和日本的大学。拉德克拉邦蒙库特国王理工学院有一个卫星通信地面站，由内务部国际交流项目提供。本实验旨在探讨国际交流协调在实际运用中的制度局限性和制度性问题。在实验中，泰语和日语之间的交流被作为实验台讲座进行。我们开发并实现了一个将视频中的单词翻译成外语的支持系统，以便学生之间能够顺利地进行交流。(2)数据传输网络体系结构的仿真我们针对SCS系统对非对称卫星网络的性能进行了数值模拟，以研究基于卫星通信的计算机网络架构。评估了可靠组播通信的网络结构，并以多个反馈电路为参数，分析了同一会话中多个发送器和接收器的性能。因此，提出了通过主动控制发射机的带宽和反馈电路的数量来提高吞吐量的可能性。较少

Improvement smoothly managing the present system is necessary for supporting international exchange in various fields of education such as language learning, science and technology and culture. The architecture is also required from the practical view. This research aimed to construct an international network of the next generation for higher education by providing infrastructure of international exchange in education for Japanese universities that have the inter-university satellite network "Space Collaboration System(SCS)" in cooperation with the international satellite network belonged to the Ministry of Internal Affairs and Communications. To achieve this aim, we conducted the following research : (1)experiment of international exchange and development of the tool, (2)Simulation of architecture for data transmission network.(1)Experiment of international exchange and development of the toolWe made experiments of international connection using plural satellites between the King Monk … More ut Institute of Technology Ladkrabang in Thailand and Japanese universities. The King Monkut Institute of Technology Ladkrabang has an earth station for satellite communications, which was provided by the international exchange program of the Ministry of Internal Affairs and Communications. We targeted the experiment to the investigation on systematic limitation and institutional problem on the coordinate in the practical use for international exchange. In the experiment, the communications between Thai and Japanese was done as a test-bed lecture. We developed and implemented a support system that translates the words included in the video into foreign languages, so that the students could communicate each other smoothly. As a result, we confirmed availability of the support tool, and suggested possibility that the support tool could be used for improvement of learners' understanding.(2)Simulation of architecture for data transmission networkWe made numerical simulation for performance of asymmetric satellite network targeting the SCS in order to study on framework of computer network using satellite communications. Network structure for reliable multicast communications was evaluated and performance of plural transmitters and receivers in the same session was analyzed with a number of feedback circuits as a parameter. As a result, possibility was suggested that the throughput was improved by actively controlling transmitters' bandwidths and the number of feedback circuits. Less