Jan Kasprzak

Learn More
In this paper we describe our approach at the PAN 2010 plagiarism detection competition. We refer to the system we have used in PAN'09. We then present the improvements we have tried since the PAN'09 competition, and their impact on the results on the development corpus. We describe our experiments with intrinsic plagiarism detection and evaluate them. We(More)
This paper describes approaches used for the Plagiarism Detection task in PAN 2013 international competition on uncovering plagiarism, authorship, and social software misuse. We present modified three-way search methodology for Source Retrieval subtask and analyse snippet similarity performance. The results show, that presented approach is adaptable in(More)
In this paper we discuss the approach we have used for finding plagiarized passages of text during the PAN'09 plagiarism detection competition. We describe the existing anti-plagiarism system we use in the Czech National Archive of Graduate Theses. We then discuss the modifications to this system which have been necessary in order to fit the results to the(More)
In this paper, we describe our approach at the PAN 2012 plagiarism detection competition. Our candidate retrieval system is based on extraction of three different types of web queries with narrowing their execution by skipping certain passages of an input document. Our detailed comparison system detects common features of input document pair, computing(More)
One of the toughest problems to solve when deploying an enterprise-wide full-text search system is to handle the access rights of the documents and intranet web pages correctly and effectively. Post-processing the results of general-purpose full-text search engine (filtering out the documents inaccessible to the user who sent the query) can be an expensive(More)
OBJECTIVE To evaluate changes in the macular thickness and volume using optical coherence tomography in patients after phacoemulsification and intracapsular implantation of a foldable intraocular lens. MATERIALS AND METHODS The study included 82 patients (37 males and 45 females) after phacoemulsification and intracapsular implantaion of the same type of(More)
Abstrakt: Kryptografie se v současné době dostává do centra pozornosti zejména v souvislosti s uplatňováním zákona o elektronickém podpisu. Snahou tohoto příspěvku je objasnit některé souvislosti a poukázat na možné problémy při praktické aplikaci kryptografie. 1 Jemný úvod do terminologie Kryptologie — z ˇ reckého kryptós (skrytý) a lógos (slovo) — je(More)
Abstrakt: V ˇ clánku je popsána technologie SCAT pro přípravu a skeno-vání formulářů, která byla v minulých třech letech použita na Masarykově univerzitě a v dalších organizacích na zpracování téměř statisíce formu-lářů vysazených T E Xem a zpracovaných za použití nástrojů otevřených sys-témů. Jsou diskutovány prvky navrženého systému směřující k minimální(More)
  • Jan Kasprzak, Michal Brandejs, Miroslav Křipač, Pavel Šmerk
  • 2008
One of the drawbacks of e-learning methods such as Web-based submission and evaluation of students' papers and essays is that it has become easier for students to plagiarize the work of other people. In this paper we present a computer-based system for discovering similar documents, which has been in use at Masaryk University in Brno since August 2006, and(More)
  • 1