National Repository of Grey Literature 3 records found  Search took 0.01 seconds. 
Roger Bacon's Theory of Signs
Karľa, Michal ; Švantner, Martin (advisor) ; Palek, Bohumil (referee)
The subject of this thesis is Roger Bacon`s work De signis. Its goal is to consider in what sense Bacon works out the general theory of signs. In this sense the thesis` method is situated in the field of "archeology of sings". First it examines Bacon`s definition of sign as a relation, investigates its formal properties and ways of application in particular cases, i.e. Bacon`s classification of signs. Then it shows the way in which Bacon applies this general notion in particular examinations, that is in problems of what the words signify, concept of univaocation and equivocation, theory of analogy and last but not least it considers a question of the nature of signification itself. The last chapter is dedicated to the examination of the (re)imposition phenomenon together with consideration of result it has on the notion of sign relation`s nature and how it serves as an explanation of the process in which these relations work. Keywords: Roger Bacon, John Deely, Charles S. Peirce, medieval semiotics, archeology of signs.
Roger Bacon's Theory of Signs
Karľa, Michal ; Švantner, Martin (advisor) ; Palek, Bohumil (referee)
The subject of this thesis is Roger Bacon`s work De signis. Its goal is to consider in what sense Bacon works out the general theory of signs. In this sense the thesis` method is situated in the field of "archeology of sings". First it examines Bacon`s definition of sign as a relation, investigates its formal properties and ways of application in particular cases, i.e. Bacon`s classification of signs. Then it shows the way in which Bacon applies this general notion in particular examinations, that is in problems of what the words signify, concept of univaocation and equivocation, theory of analogy and last but not least it considers a question of the nature of signification itself. The last chapter is dedicated to the examination of the (re)imposition phenomenon together with consideration of result it has on the notion of sign relation`s nature and how it serves as an explanation of the process in which these relations work. Keywords: Roger Bacon, John Deely, Charles S. Peirce, medieval semiotics, archeology of signs.
The Virtual Imaging of the Distant Objects by Longfocal Positive Lenses and Concave Mirrors
Rail, Zdeněk ; Vápenka, David
The longfocal positive lenses and concave mirrors can serve as optical elements increasing the angular dimensions of the distant objects similarly to telescope.\nThese properties could be probably used by ancient observers before the discovery of telescope.\nOur paper brings optical analysis and results of visual astronomical observations with the longfocal positive lens.

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