Premozh Yacopeen), born 30 June 1949 is a Slovenian computer scientist, known for his work in the field of language technology and his contribution to speleology.

[2] After a degree in technical mathematics (Numerično računanje singularnih integralov / Numerical Computation of Singular Integrals) at the University of Ljubljana in 1972,[3] he obtained a master's degree in information sciences with the thesis Entropija imena i prezimena u Sloveniji / On entropy of first names and last names in Slovenia[4] at the University of Zagreb in 1981 and in 1999 a Ph.D. with the thesis Zgornja meja entropije pri leposlovnih besedilih v slovenskem jeziku / Upper Bound of Entropy in Slovenian Literary Texts,[5] again at the University of Ljubljana.

[8] His major pieces of software: IBIS for the Digital DEC 10 mainframe computer, 1981, INES for the ZX Spectrum microcomputer, 1985,[9][10] STEVE (ATARI ST, 1987-1992),[11] EVA for DOS, 1992- and Microsoft Windows family of operating systems, 1996-,[12] NEVA - Windows server search engine, 1999-.

In high school, he read the book Kraški svet in njegovi pojavi / Karst world and its phenomena by Pavel Kunaver[13] and especially because of its photographs by Bogumil Brinšek, Jakopin became interested in speleology.

[21] In 1974 he made a 3D model for approximation of cave space, based on a series of connected polygonal cross sections and used it to make a 3D survey of Skednena jama cave, a fossil ponor at the northern rim of the Planinsko polje karst field in Slovenia.

The model had 305 vertices, 51 cross sections, total length was 205 m, surface area 8900 m2 and volume 6,500 m3 with error estimated at below 5%.

[23] After microcomputers became widely available in the early 1980s, Jakopin developed a different method of volume calculation which could be performed with much less computing power.