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Jorma Rissanen
Jorma Johannes Rissanen (October 20, 1932 – May 9, 2020) was an information theorist, known for originating the minimum description length (MDL) principle and practical approaches to arithmetic coding for lossless data compression. His work inspired the development of the theory of stochastic chains with memory of variable length. Education and career Rissanen was born in Pielisjärvi (now Lieksa in Finland and grew up in Kemi, a border town between Finland and Sweden. He moved to Helsinki and studied at the Helsinki University of Technology, where he obtained his Master’s degree in electrical engineering in 1956 and licentiate in control theory in 1960. He studied there under Olli Lokki and Hans Blomberg. Rissanen became an IBM researcher since 1960, first in Stockholm, Sweden, while still a Ph.D. student under Hans Blomberg. Most of his PhD work was done remotely as a result and he received his Ph.D. from the Helsinki University of Technology in 1965 with a topic on ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pielisjärvi
Pielisjärvi is a former municipality in the region of North Karelia in Finland. The municipality had inhabitants in 1970. Pielisjärvi was a Finnish-speaking municipality. Pielisjärvi municipality was joined with the city of Lieksa in 1973. History Pielisjärvi is named after the lake Pielinen, sometimes also called ''Pielisjärvi''. The area of modern North Karelia was ceded by Russia to Sweden in 1617 in the Treaty of Stolbovo, becoming part of the Kexholm County in 1634. Pielisjärvi was first mentioned in 1618 as ''Pelis Järffwi Pogost''. Pielisjärvi was originally a part of the Liperi parish, being separated in 1639. At the time, Pielisjärvi also included Juuka, Nurmes and Valtimo. Nurmes, including Valtimo and most of Rautavaara, was separated in 1810 while Juuka was separated in 1873. In 1936, Lieksa Lieksa () is a town and municipality of Finland. It is located in the North Karelia region. The municipality has a population of () and covers an area of of w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |