The Practice and Prospect of Distance Learning in Tsinghua University_网络技术论文

directional interactive discussion and questioning and answering using exiting PSTN or ISDN-based video conference system. For VSAT system, the transmitting quality is good but the facilities costs are very high, and it takes up the band of satellite. So it is not impossible to establish many VSAT sites. For ISDN videoconference system, the transmitting quality is good and the facilities costs are not very high, so there are many remote sites to adopt ISDN as interactive means. But not all region in China are ISDN accessible. For Video-phone and Desktop video-conference system, the costs are low but quality is poor, so the system are seldom used now.

Off-Campus Sites Construction
The Tsinghua Distance Education has now more than 90 off-campus sites with a wide coverage all over China. The establishment of remote sites is mostly done in collaboration with four kinds of organizations, as following:
l State -owned large-and-medium-sized enterprises, e.g., Iron and Steel Firm, Laiwu, Shandong; Qilu Petrochemicals, Shandong; The First Automobile Works, Changchun, Jilin; Daqing Petrochemicals, and so on.
l Universities, colleges and schools at different levels, e.g. Yunnan University, Jiangnan college, Sichuan Radio and TV University, zhejiang Radio and TV University, and so on
l Government agencies, e.g. Bureau of Science and Technology, Nanhai, Guangdong; Association for Science and Technology, Shijiazhuang, Hebei; and so on.
l Scientific and technological research institutions, e.g., 014 Base, China Aerospace Corporation, and so on.
On the basis of the instructions of vice premier Li Lanqing, we pay attention to develop the remote sites at western regions, up to now, we have established 18 off-campus sites at the western regions including Xinjiang Autonomous Region, Qinghai Province, Guangxi Province, Yunnan Province, Ninxia Province, Shaanxi Province, and so on.

Types of courses
The distance education in Tsinghua

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