On February 26, 2001 (February 4, 2001 in the lunar calendar), Claude Elwood Shannon, founder of American information theory, passed away. Claude Elwood Shannon (April 30, 1916-February 26, 2001) was an American mathematician and founder of information theory. Born on April 30, 1916 in Petoskey, Michigan, USA, and is a distant relative of Edison. He graduated from the University of Michigan in 1936 with a bachelor's degree in mathematics and electrical engineering, where he met Boole and took his courses. In 1940, he received a doctorate in mathematics and a master's in electrical engineering from the Massachusetts Institute of Technology (MIT). He joined the Mathematics Department of Bell Labs in 1941 and worked until 1972. He became a visiting professor at the Massachusetts Institute of Technology (MIT) in 1956, became a tenured professor in 1958, and an honorary professor in 1978. Dr. Shannon passed away on February 26, 2001, at the age of 84. Shannon began thinking about information theory and effective communication systems in 1940 while at the Institute for Advanced Study in Princeton. After eight years of hard work, Shannon published his far-reaching paper "The Mathematical Principles of Communication" in the Journal of Bell Systems Technology in June and October 1948. In 1949, Shannon published another famous paper,"Communication under Noise", in the journal. In these two papers, Shannon clarified the basic problems of communication, gave a model of the communication system, proposed a mathematical expression of the amount of information, and solved a series of basic technical problems such as channel capacity, source statistical characteristics, source coding, and channel coding. The two papers became the founding works of information theory.