우주인터넷과 Delay/Disruption Tolerant Netwoking (DTN) 프로토콜 개발 동향

In the past, just a few advanced countries led in field of space. Recently, however, more and various countries take part in this field and even many private companies expand their business boundary into the space. Early this year, Elon Musk, CEO at Space X, announced new project "Space Internet". National Aeronautics and Space Administration(NASA) and European Space Agency(ESA) also use this term, somewhat different way, as a network for deep space communication technology. In this paper, Space Internet of private company and national agency is described. Delay/Disruption Tolerant Networking (DTN) and related experiments are introduced as well.