Technical Aids for Mirroring Sites and China Popular Science Exhibition(CPSE)

1. Technical Aidsfor Mirroring Sites and China Popular Science Exhibition(CPSE) Chen Hui CNIC ,CAS(Computer Network Information Center , Chinese Academy of Sciences)

2. Mirroring sites • Current status of mirror sites of CPSE • Rsync, the tool for mirroring sites • How to set up mirror site • Application of new technology to CPSE • Flash • Streaming video/audio • VRML • JSP • Web site log files analysis

3. Mirroring sites • Current status of mirror sites of CPSE • Rsync, the tool for mirroring sites • How to set up the mirror site of China Popular Science Exhibition(CPSE)

4. Current status of mirror sites of CPSE • Objective • convenient and fast access to CPSE • have more people learn science knowledge • Mirror Sites • Taiwan, China, April 2000 • Nanjing City, China, July 2000 • Dalian City, China, September 2000 • Platform • Netscape WebServer+Sun Solaris • Apache+Linux

5. Rsync, tool for mirroring sites • What is the Rsync • Features of Rsync • can update whole directory trees and file systems • optionally preserves symbolic links, hard links, file ownership, permissions, devices and times • requires no special privileges to install • internal pipelining reduces latency for multiple files • can use rsh, ssh or direct sockets as the transport • supports anonymous rsync which is ideal for mirroring

6. How to use Rsync • Using rsh,ssh as the transport • Client/Server architecture • set rsync server on remote machine running on TCP port 873 • on the client machine,start rsync with command line • Security consideration: C/S+SSH • SSH(secure shell) maximum security and privacy on the Internet and local networks • combine Rsync sever with SSH

7. How to set up the mirror site of CPSE • Configure the Rsync running environment • Installation and configuration of SSH • Installation and configuration of Rsync • Make the CD copy of CPSE and install it on the server in mirror site • Transfer latest changes from the main site in China to the mirror site

8. Application of new technology to CPSE • Flash • A new technology and tool to design and deliver low-bandwidth animations, presentations, and Web sites. • Simple interactivity by scripting • Applied Examples in CPSE • Animation to show scientific reasons • Reasons for lakes • Interactive game to test your knowledge • How to escape from the earthquake spot

9. Application of new technology to CPSE • Streaming Video/Audio • produce a streaming video/audio file • Shoot - capture – edit – compress/encode - distribute • Two types of streaming • Progressive streaming • Download via http • Require no special server • High quality • Suited for short video • Real-Time streaming • Require streaming server • Real time play automatically via RTP/RTSP • Quality decided by user’s connection speed • Very suited for long video

10. Application of new technology to CPSE • Streaming Video/Audio • Applied Examples CPSE • Movies to show wild life

11. Application of new technology to CPSE • Virtual Reality Modeling Language(VRML) • A modeling language based on ASCII • Can be integrated with Java、Java applet and multimedia files • Suited for internet • Applied examples in CPSE • Show you a 3D Model

12. Application of new technology to CPSE • Develop web-based application using JSP • What’s JSP(Java server pages) • Excellence • Platform and server independence • Java advantage • Scalability in the Enterprise • Examples in CPSE • Forum

13. Web site log file analysis • Objective • Learn the web access and improve our service • Log analysis of mirror sites of CPSE • Transfer everyday log files from the mirror sites to the main site in China. • Analyze the log file of the mirror sites and transfer useful message to the main site in China

14. Thank you