an academician of the Chinese Academy of Engineering, and Professor Kegong zhao, formerly the president of the Chinese National Institute of Metrology. The Institute of Instrument Science and Technology The Institute of Instrument Science and Technology is the most important institute in the State Key Laboratory of Precision Measuring Technology and Instrument Science at Tsinghua University. The institute is equipped with advanced instruments and facilities, and its research has included every major area in modern instrument science and technology. Up to 2012, the institute have produced over 1500 publications, more than 100 patents, and acquired many significant awards. The Engineering Research Center for Navigation Technology The Engineering Research Center for Navigation Technology is a relatively young institute in the Department of Precision Instrument which was established in 2000, with the intention to "[pursue] excellence in the research and development in the field of high-accuracy inertial instruments and navigation technology, as well as in MEMS inertial sensor fields, and to provide advanced training for future scientists and engineers in the field of inertial technology." Its research interests cover high-accuracy inertial instruments and navigation technology, MEMS inertial sensors and systems, and precise electro-mechanical control systems and their application. As of 2012, the area of the center is 2900 square meters, including approximately 550 square meters of clean rooms. Equipment and instruments in this center are worth over 50 million RMB (US$7.56 million). The Center for Photonics and Electronics The center for Photonics and Electronics works on advanced laser and photonic technology. It houses 200 square meters of clean rooms and very modern laser instruments and equipment. The research of this Center covers solid-state laser technology, fiber laser technology, active optics technology, and laser detection technology. The center has published more than published more than 100 scientific papers including 40 indexed by SCI, has 18 national patents, and also frequently exchange visits and academic conferences with foreign scholars. The State Key Laboratory of Tribology Under the authorization of China's State Planning Commission and Ministry of Education, the State Key Laboratory of Tribology (SKLT) was established in November, 1988. The present director of the SKLT is Professor Yonggang Meng, and the present chair of the Academic Committee of the SKLT is Professor Jue Zhong, who is also a member of Chinese Academy of Engineering. The SKLT has one central laboratory and four sub-laboratories. It has been awarded numerous awards, including "two National Natural Science