Question: Kotaro Honda was taught by a pioneer of Japanese physics during what period?

<P0-S0> Kotaro Honda (本多 光太郎, "Honda Kōtarō", born on February 23, 1870 in Okazaki, Aichi Prefecture – February 12, 1954) was a Japanese scientist and inventor. <P0-S1>  He invented KS steel (initials from Kichiei Sumitomo), which is a type of magnetic resistant steel that is three times more resistant than tungsten steel. <P0-S2>  He later improved upon the steel, creating NKS steel. <P0-S3>  The NKS steel was mentioned by Taiichi Ohno in his book, as being one of the Japanese materials development results after the Second world war. <P0-S4>  He was awarded the Culture Award and the Big Asahi Ribbon of the First Class. <P0-S5>  He was taught by the famous Japanese physicist Hantaro Nagaoka at the University of Tokyo. <P0-S6>  He was one of the first persons to be awarded the Order of Culture when it was established in 1937, being conferred with the honor in 1951. <P0-S7>  He was posthumously awarded the Grand Cordon of the Order of the Rising Sun. <P0-S8>  He participated in establishing the (千葉工業大学, "Chiba Institute of Technology") from 1940. <SEP> <P1-S0> Issac (Issaku) Koga was born on December 5, 1899 in Tashiro Village (now Tosu) in Saga Prefecture, Japan, the eldest of 7 children. <P1-S1>  In July 1920, at the age of 20 he started to study at the Department of Electrical Engineering of Tokyo Imperial University (later renamed University of Tokyo). <P1-S2>  After graduation in August 1925, he moved to the new Tokyo City Electrical Institute, which was established to develop and promote radio broadcasting technology under the directorship of Kujirai Kotaro, a pioneer of research and teaching of radio science. <P1-S3>  Initially an engineer, he became an assistant professor in 1929. <P1-S4>  Under the guidance of Prof. Kotaro he studied crystal oscillators, forming the basis of his PhD thesis, completed in April 1930, entitled "Characteristics of the crystal oscillator". <P1-S5>  This work included making the first quartz tuning forks in 1927. <P1-S6>  In 1929 he became an associate professor of Tokyo Institute of Technology and professor in 1939. <P1-S7>  He became a professor emeritus of Tokyo Institute of Technology in 1961. <P1-S8>  In 1944, he worked as a concurrent professor at University of Tokyo and later became a professor emeritus. <SEP> <P2-S0> Hantaro Nagaoka (長岡 半太郎 , Nagaoka Hantarō , August 19, 1865 – December 11, 1950) was a Japanese physicist and a pioneer of Japanese physics during the Meiji period. <SEP> <P3-S0> This Honda Today was a "kei car" (minivehicle) produced by the Japanese automaker Honda beginning in 1985. <P3-S1>  It was replaced by the Honda Life in 1998. <P3-S2>  Honda's smallest car being produced at the time was the Honda City, which was a supermini and it had an engine larger than "kei" car legislation allowed. <P3-S3>  The Today represented a re-entry into "kei" car production. <P3-S4>  Honda had abandoned "kei" passenger cars in 1975, choosing to manufacture the Honda Acty kei truck, and the Honda Street microvan for that segment. <P3-S5>  Previously, Honda's smallest car was the Honda Civic, followed by the smaller Honda City in 1981.