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Deng Julong (; January 1933 – June 22, 2013) was a professor of Huazhong University of Science and Technology, Wuhan,
China China, officially the People's Republic of China (PRC), is a country in East Asia. It is the world's most populous country, with a population exceeding 1.4 billion, slightly ahead of India. China spans the equivalent of five time zones and ...
. He is acknowledged as the founder of grey system theory, first proposed in 1982 with the publication of his paper “Control problems of grey systems,” in the international journal ''Systems and Control Letter'', edited at the time by
Roger W. Brockett Roger Ware Brockett (born October 22, 1938 in Seville, Ohio) is an American control theorist and the An Wang Professor of Computer Science and Electrical Engineering at Harvard University, who founded thHarvard Robotics Laboratoryin 1983. Brocket ...
, a professor at Harvard University. This theory underlies the theory of
grey relational analysis Grey relational analysis (GRA) was developed by Deng Julong of Huazhong University of Science and Technology. It is one of the most widely used models of grey system theory. GRA uses a specific concept of information. It defines situations with no i ...
. His theory inspired many noted scholars like Jeffrey Yi-Lin Forrest,
Liu Sifeng Liu Sifeng (; born 15 July 1955) is a Chinese systems engineer. He is the director of the Institute for Grey Systems Studies at Nanjing University of Aeronautics and Astronautics, Nanjing, China. He is best known for his work on grey system t ...
, and Keith W. Hipel, recipient of Izaak Walton Killam Memorial Prize.Liu, SF., Yang, Y., and Forrest, J. (2017). ''Grey Data Analysis''. Springer.


Academic career

The works of Professor
Lotfi A. Zadeh Lotfi Aliasker Zadeh (; az, Lütfi Rəhim oğlu Ələsgərzadə; fa, لطفی علی‌عسکرزاده; 4 February 1921 – 6 September 2017) was a mathematician, computer scientist, electrical engineer, artificial intelligence researcher, an ...
significantly inspired Deng, and the uncertainty of the Deng Xiaoping era inspired him to work on uncertain systems. In 1965, he proposed the theory of multivariate system control. His academic paper, "an integrated approach to the parallel calibration of multivariate linear systems", was published in ''Acta Automatica'