Hans Rohleder

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Hans Rohleder (born May 22, 1929 in Freital ; † January 21, 2011 in Schkeuditz ) was a German physicist specializing in mathematical cybernetics and computing technology as well as computer science . He is one of the pioneers in the theoretical basics of control technology ( switching algebra ), computing technology and computer science. He was a professor at the University of Leipzig .

Training and career entry

Hans Rudolf Rohleder was the son of the elementary school teacher Rudolf Rohleder and his wife Johanna Rohleder, born. Kiss. From 1935 to 1939 he attended elementary school in Freital- Potschappel , then the state high school for boys in Dresden- Plauen .

After graduating from high school in 1947, he went to study physics at the Dresden University of Technology (TH Dresden). In November 1952 he passed the main diploma examination and received the academic degree of diploma physicist .

Rohleder started his career immediately afterwards at the end of 1952 as a research assistant at the Institute for Applied Mathematics at the TH Dresden. In October 1955 he switched to the Institute for Mathematical Logic at the Humboldt University of Berlin (HUB) as a research assistant for two years . This change took place at the suggestion of the Berlin mathematician and logician Karl Schröter in order to put Rohleder's own research on switching algebra on a solid theoretical basis thanks to his special additional qualification as a mathematician.

At the beginning of 1958 he returned to Dresden to take up a position as a research assistant at the Institute for Computer Engineering at the TH Dresden, which he held until 1962. As a physicist and mathematician, Rohleder was involved in the development of one of the first relay-based small computers at Nikolaus Joachim Lehmann . At the beginning of his work there was the completion of his doctoral procedure for Dr. rer. nat. at the mathematical and natural science faculty of the TH Dresden. In the following years he also gave guest lectures on switching algebra , computer engineering , advanced mathematics and calculus of variations at the original University of Chemistry in Leuna-Merseburg , the University of Transport in Dresden and the former University of Electrical Engineering in Ilmenau . At the same time he worked from 1960 to 1962 at the department for mathematical linguistics and automatic translation of the German Academy of Sciences in Berlin (DAW) in Berlin. At the beginning of 1962 Rohleder qualified as a Dr. rer. nat. habil. at the TH Dresden. At the same time he received the license to teach (Venia legendi) for the subject of computer engineering . He was therefore allowed to use the designation private lecturer .

University professor in Leipzig

In 1962, Hans Rohleder was appointed professor with a teaching position for computer technology at the computing center of the mathematical and natural science faculty of the Karl Marx University of Leipzig (KMU). This was followed in 1969 by his appointment as full professor for mathematical cybernetics and computing technology for SMEs, section computing technology and data processing. In 1973 he switched to the mathematics section in the faculty for mathematics and natural sciences at SMEs in the same field.

Here in Leipzig, Rohleder intensively continued his research area on mathematical switching algebra, originally developed with his habilitation thesis, with possible applications in control technology . With his successful scientific work he achieved both national and international reputation. He cooperated closely with the German Academy of Sciences in Berlin (DAW), Institute for "Regulation and Control Technology" in Dresden (Director: Heinrich Kindler ). At that time there was a dedicated department for control technology / switching systems (head: Siegfried Pilz , then Hans-Joachim Zander ).

As part of the Academy reform, parallel to the higher education reform began in the GDR also in 1968 and until 1972 took the "Institute of Automatic Control Technology" Dresden as "Area Technical was cybernetics " in the newly founded in 1972, the Central Institute of Cybernetics and Information Processes (ZKI) Berlin classified (founding director: Horst Völz ). In addition to the existing management of the switching systems department, the overall management of the Dresden area was transferred to Zander, so that the cooperation with Rohleder could continue to be successfully continued. Due to the scientific status achieved in the GDR, to which Rohleder contributed with his basic mathematical work on switching algebra, the 2nd IFAC Symposium Discrete Systems 1977 was held in Dresden at the suggestion of the International Federation of Automatic Control (IFAC) Hans Rohleder was also actively involved. In the International Program Committee headed by Hans-Joachim Zander, Karl Heinz Fasol (Ruhr University Bochum), Manfred Thoma (University of Hanover), Siegfried Pilz (TH Ilmenau), Hans Rohleder (University of Leipzig) and Gerhard Merkel (Robotron, Center for Research and Technology Dresden). The following members of the committee were USA representatives: EJ McCluskey, J. Hartmanis and SH Unger. The USSR was represented by MA Gavrilow, WG Lasarew, EA Yakubaitis and AD Zakrevskij. The countries Bulgaria, Belgium, France, Great Britain, Poland, Switzerland, Czechoslovakia and Hungary were represented by well-known scientists.

After German reunification , Rohleder was temporarily employed as a professor (according to BAT-O / I a) at the Department of Mathematics / Computer Science at the University of Leipzig from autumn 1991. In June 1992 he was appointed full professor for computer science at the University of Leipzig. Until 1994 he worked as a professor for mathematical foundations of information processing at the Institute for Computer Science in the Faculty of Mathematics and Computer Science at the University of Leipzig. At the end of May 1994, when he reached retirement age, he was recalled and retired .

Academic self-administration, memberships and honors (selection)

  • 1962–1969 head of the organization and data center at KMU Leipzig
  • 1969–1973 Director of the Computer Technology and Data Processing Section
  • 1973–1979 Head of the research collective "Mathematical Foundations of Information Processing"
  • 1954–1961 Member of the Society for Applied Mathematics and Mechanics (GAMM)
  • 1961–1990 Member of the Mathematical Society (MGDDR)
  • 1964–1968 member of the working group “Mathematical and natural scientific basic research for the development of computing technology, data processing and automation” at the State Secretariat for Research and Technology of the GDR government
  • 1964 Medal of Merit of the GDR.

Publications (selection)

  • The three-valued propositional calculus of theoretical logic and its application to describe circuits that consist of elements with two stable states. ZAMM, Vol. 34 (1954) H. 8-9, pp. 308-311.
  • The use of propositional calculi to describe electrical circuits. Zs. For Mathematical Logic and Fundamentals of Mathematics, Vol. 1 (1955) H. 3/4, pp. 304–309.
  • The transformation of logical expressions with the help of program-controlled computing systems. Zs. For Mathematical Logic and Fundamentals of Mathematics, Vol. 2 (1956) H. 2, pp. 57–58.
  • About a theory of some classes of electrical circuits. Zs. For Mathematical Logic and Fundamentals of Mathematics, Vol. 3 (1957) H. 3/4, pp. 225-291.
  • About the use of a propositional calculus in the synthesis of arithmetic units. Zs. For Mathematical Logic and Fundamentals of Mathematics, Vol. 3 (1957) H. 3/4, pp. 292-302.
  • On a work by A. Svoboda. In: Nikolaus Joachim Lehmann (Ed.): Current problems of computing technology. Report on the International Mathematicians Colloquium, Dresden, November 22-27, 1955; on the occasion of the inauguration of the new rooms of the mathematical institutes of the Technical University of Dresden. Deutscher Verlag der Wissenschaften, Berlin 1957, p. 155.
  • A method for establishing optimal normal forms given prime implicands. Zs. For Mathematical Logic and Fundamentals of Mathematics, Vol. 5 (1959) H. 3/4, pp. 334–339.
  • Investigations into optimal expressions of the propositional calculus. Knowledge Journal of the TH Dresden, Volume 9 (1959/60) pp. 1-4.
  • Simplification of the synthesis of certain series parallel connections by splitting them into sub-problems. ZAMM, Vol. 40 (1960) H. 1-3, pp. 125-130.
  • To multiply the brackets in the Nelson method. ZAMM, Vol. 41 (1961) special issue; T 77-T 79.
  • About the synthesis of series parallel connections under incompletely given working conditions. Zs. For Mathematical Logic and Fundamentals of Mathematics, Vol. 8 (1962) H. 3/4, pp. 165–199.
  • For the transformation of a special class of calculation methods. Zs. For Mathematical Logic and Fundamentals of Mathematics, Vol. 8 (1962) H. 3/4, pp. 201–246.
  • A partial order in the statement calculus. Zs. For Mathematical Logic and Fundamentals of Mathematics, Vol. 9 (1963) H. 1, pp. 21–52.
  • Reduction of the number of variables for certain synthesis problems. Zs. For Mathematical Logic and Fundamentals of Mathematics, Vol. 9 (1963) H. 2, pp. 111–112.
  • A method of finding minimal expressions. Zs. For Mathematical Logic and Fundamentals of Mathematics, Vol. 9 (1963) H. 2, pp. 125–140.
  • A note on line dominance when looking for optimal normal forms. Zs. For Mathematical Logic and Fundamentals of Mathematics, Vol. 11 (1965) H. 4, pp. 273-276.
  • The synthesis problem of switching algebra and its mathematical formulation. Zs. For Mathematical Logic and Fundamentals of Mathematics, Vol. 12 (1966) H. 4, pp. 13-22.

literature

  • Rawhide, Hans. In: Herbert Beckert , Horst Schumann (Ed.): 100 Years of Mathematical Seminar of KMU Leipzig. Deutscher Verlag der Wissenschaften, Berlin 1981, pp. 326–329.
  • Rawhide, Hans. In: Kürschner's German Scholars Calendar (16th edition). Verlag Walter de Gruyter, Berlin 1992 (16) Vol. 2: I – R, p. 1820.
  • Rawhide, Hans. In: Appointment of university lecturers to the University of Leipzig (continuation of the list of November 10, 1992). Journal of the University of Leipzig, Issue 7, Leipzig 1992, p. 6.
  • Hans-Joachim Girlich, Karl-Heinz Schlote: Mathematics. In: Ulrich von Hehl , Uwe John, Manfred Rudersdorf (eds.): History of the University of Leipzig 1409–2009. Volume 4: Faculties, institutes, central facilities (2nd half volume). Universitätsverlag, Leipzig 2009, pp. 1073-1092.
  • Siegmar Gerber, Gerhard Heyer: Computer Science. In: Ulrich von Hehl, Uwe John, Manfred Rudersdorf (eds.): History of the University of Leipzig 1409–2009. Volume 4: Faculties, institutes, central facilities (2nd half volume). Universitätsverlag, Leipzig 2009, pp. 1093-1097.
  • Jürgen Janassary: Obituary for Prof. Dr. Hans Rohleder. Journal of the University of Leipzig, Volume 3, Leipzig 2011, pp. 43–44.

Web links

Individual evidence

  1. ↑ Hans Rohleder: About a theory of some classes of electrical circuits. Dissertation, Mathematical and Natural Science Faculty of the TH Dresden, reviewers: Nikolaus Joachim Lehmann (TH Dresden), Karl Schröter (Humboldt University Berlin). Dresden 1958.
  2. ↑ Hans Rohleder: Investigations on switching algebra. Habilitation thesis at the mathematical and natural science faculty of the TH Dresden. Reviewers: Nikolaus Joachim Lehmann (TH Dresden), Günter Asser (Ernst Moritz Arndt University Greifswald), Heinz Zemanek (University of Vienna). Dresden 1962.
  3. ↑ Hans-Joachim Zander : Control of event-discrete processes. New methods for process description and design of control algorithms. Springer Vieweg Verlag, Wiesbaden 2015, p. 23, ISBN 978-3-658-01381-3 , e-book ISBN 978-3-658-01382-0 .
personal data
SURNAME Rawhide, Hans
BRIEF DESCRIPTION German physicist and mathematician, professor of cybernetics, computing technology and computer science
DATE OF BIRTH May 22, 1929
PLACE OF BIRTH Freital
DATE OF DEATH January 21, 2011
Place of death Schkeuditz