On 30th September 1990, South Korea and the USSR established formal diplomatic relations. The author looks at the background of the process leading to the establishment of South Korean-Soviet diplomatic relations, launching of the Gorbachev system, South Korea's "Northern Policy", deterioration...

The flow velocity of exhaust gas from an industrial stack varies from facility to facility and can easily change over time, even in a stack. To accurately measure the concentration of fine particles such as PM 10 or PM 2.5 emitted in such environments, the conditions for isokinetic sampling must...