Core Viewpoint - Yang Shiao, a prominent scientist and educator, is recognized for his significant contributions to marine acoustics and his dedication to nurturing talent in China, earning him the title of "Model of the Times" posthumously [4][6]. Group 1: Personal Background and Achievements - Yang Shiao was born in August 1931, was a member of the Communist Party, and served as an academician at the Chinese Academy of Engineering and a professor at Harbin Engineering University [5]. - He was a pioneer in the field of underwater acoustics in China, leading the development of domestic underwater positioning systems that reached international advanced levels [5]. - Yang Shiao's work included leading China's first independent large-scale deep-sea acoustic survey, addressing long-standing challenges in underwater noise reduction and measurement methods [5]. Group 2: Educational Contributions - He established the first comprehensive underwater acoustics engineering program in China, significantly influencing generations of students with his educational philosophy [5][6]. - Yang Shiao was honored with multiple awards, including "National Excellent Teacher" and "National Model of Educating and Teaching," reflecting his commitment to education and scientific advancement [6]. Group 3: Legacy and Recognition - Yang Shiao passed away on March 19, 2024, at the age of 93, leaving behind a legacy of dedication to his country and the field of marine science [5]. - On September 19, 2024, the Central Propaganda Department publicly recognized his achievements and contributions, posthumously awarding him the title of "Model of the Times" [6].

Core Viewpoint - The article commemorates the life and contributions of Ma Yuanliang, a prominent figure in underwater acoustics and sonar technology in China, who passed away at the age of 87, highlighting his pioneering work and lasting impact on the field [1][5]. Group 1: Early Life and Education - Ma Yuanliang was born in 1938 in Sichuan and initially aimed to study physics at Peking University, but shifted his focus to national defense in 1956, enrolling in the Northwest Institute of Technology [1][2]. - He was among the first students to study underwater acoustics when the program was established in 1958, later becoming one of the eight students sent for advanced training at the Military Engineering Academy [1][2]. Group 2: Career Achievements - During his early career, Ma led the development of the "K4 sonar measurement device," which was showcased during the 10th anniversary of the founding of the People's Republic of China, igniting his passion for underwater acoustics [2]. - At the age of 27, he became the chief designer of China's first helicopter-deployed sonar system, overcoming challenges to successfully develop the first aviation sonar by 1976, which won a national science award in 1978 [2][3]. - His visit to France in 1978 inspired him to innovate, leading to a new sonar system that achieved detection ranges 2-3 times greater than Western counterparts by 1981, marking a significant leap in technology [2][3]. Group 3: Educational Contributions - Ma Yuanliang emphasized the importance of education alongside research, establishing China's first doctoral program in underwater weaponry and mentoring the first doctoral student in the field [4]. - He encouraged students to adopt a "nail spirit," which emphasizes perseverance and dedication in overcoming scientific challenges, fostering a culture of innovation [4]. Group 4: Legacy - Ma's commitment to combining teaching and research reflects his belief in the importance of passing on knowledge and values to future generations [5]. - His contributions to underwater acoustics have left a lasting legacy, inspiring future researchers to explore deeper and broader realms in the field [5].

Company Overview - Beijing Zhongke Haixun Digital Technology Co., Ltd. was established in 2005 and is headquartered in the Zhongguancun Science Park, focusing on high-tech products in marine engineering and underwater acoustics [1] - The company specializes in the development of high-performance signal processing platforms, sonar systems, simulation systems, and big data applications [1] Stock Performance - Zhongke Haixun has experienced a decline for seven consecutive trading days, with a cumulative drop of -13.41% [1] - The fund "Changcheng Jiujia Innovation Growth Mixed A" has entered the top ten shareholders of Zhongke Haixun and is a new addition in the first quarter of this year [1] Fund Performance - The year-to-date return for Changcheng Jiujia Innovation Growth Mixed A is -2.36%, ranking 1401 out of 2008 in its category [2] - The fund manager, You Guoliang, has been with Changcheng Fund Management Co., Ltd. since August 2019 and has managed various funds [3][4] Fund Manager Background - You Guoliang holds a master's degree and has previously worked at several securities and asset management companies before joining Changcheng Fund [3][4] - He has managed the "Changcheng Jiujia Innovation Growth Flexible Allocation Mixed Fund" since October 2019 [4]