Congratulations on the Opening Ceremony of the 40th Anniversary Commemorative Exhibition of the Founding of Grey System Theory

(Read out at the opening ceremony by Professor Wei Tang)

28^th November, 2022

Professor Sifeng Liu

Institute for Grey Systems studies

Nanjing University of Aeronautics and Astronautics

The complexity of the system structure and development process, the information asymmetry between the manufacturer and related parties, and the influence of multi-dimensional factors such as design, materials, technology, personnel, etc., make the reliability design, test, growth and optimization process of aerospace equipment face a lot of difficulties. In addition, the characteristics of complex systems, the limitations of existing observation methods and people's cognitive ability, as well as the impact of data acquisition methods, acquisition equipment, storage technology, etc., lead to the typical poor information characteristics of the data that people possess. The grey system theory founded by Professor Julong Deng of Huazhong University of Science and Technology in 1982 is a powerful tool for modeling, analyzing, forecasting and decision-making of poverty information system.

Over the past 40 years, after several generations of hard work, a Chinese original theory has established a relatively complete system structure and stepped onto the international academic stage step by step.

The grey system model and method have been applied to the analysis of the development data of major aerospace equipment, which has solved practical problems such as reliability growth evaluation, life prediction, cost calculation and intelligent scheduling, and achieved gratifying results. For example, the research achievement "key technology and application of complex equipment development and management in the context of poor information" completed by Professor Sifeng Liu's research team in cooperation with China Academy of Launch Vehicle Technology and other institutions won the first prize of National Defense Science and Technology Progress Award. And their research achievement "Key technology and application of gray system analysis in the collaborative development of large passenger aircraft", which was completed in cooperation with COMAC, won the second prize of the Science and Technology Progress Award of the Ministry of Education of China. There are also many application results displayed in this commemorative exhibition, which fully shows that the grey system theory has great applications.

Congratulations on the success of the 40th anniversary exhibition of the founding of the grey system theory ! I wish the grey system theory will continue to carry forward!

                                                  Baozhu Guo 

                             Academician of the International Academy of Astronautics

                                                                    and Former Chief Designer of China Aerospace Satellite Engineering