{'fraction_non_alphanumeric': 0.028925619834710745, 'fraction_numerical': 0.01652892561983471, 'mean_word_length': 4.271739130434782, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
The Legacy of Rudolf Kalman-What I Learned from Him [Historical Perspectives]

Prof. Rudolf Emil Kalman passed away on July 2, 2016 at the age of 86 years old. I learned this sad news in an email from my friend Tryphon Georgiou. The news made me reflect for a while on Kalman's enormous achievements and also on his influence on me and my research. Without his guidance and supervision, my research career would never have been possible, and I am eternally grateful to him (Figure 1).