Papers by Anisa Al-Hafeedh
In the 1970s, Abraham Lempel and Jacob Ziv developed the first dictionary-based compression metho... more In the 1970s, Abraham Lempel and Jacob Ziv developed the first dictionary-based compression methods (LZ77 and LZ78). Their ideas have been a wellspring of inspiration to many researchers , who generalized, improved and combined them with run-length encoding (RLE) and statistical methods to form many commonly used lossless compression methods for text, image and sounds. The proposed methods factor a
Three-level morphological analyzer for arabic verbs and particles
As the presence of e-books on university campuses proliferate, it is crucial that we understand t... more As the presence of e-books on university campuses proliferate, it is crucial that we understand their role in students’ lives. This research reports on a survey distributed to Sultan Qaboos University students and shares their perceptions of the use of e-books. The study used the quantitative approach to investigate the issues related to the uses and perceptions of e-books by asking students to weigh in on this important issue. The findings indicate that students at SQU have multiple and diverse experiences with e-books, but do not necessarily prefer the electronic format over print for their academic experiences. Despite e-books growing presence, students may need more time and encouragement to change their use and preferences to e-books so exclusively.
A comparison of index-based lempel-Ziv LZ77 factorization algorithms
ACM Computing Surveys, 2012
ABSTRACT Since 1977, when Lempel and Ziv described a kind of string factorization useful for text... more ABSTRACT Since 1977, when Lempel and Ziv described a kind of string factorization useful for text compression, there has been a succession of algorithms proposed for computing “LZ factorization”. In particular, there have been several recent algorithms proposed that extend the usefulness of LZ factorization, for example, to the calculation of maximal repetitions. In this article, we provide an overview of these new algorithms and compare their efficiency in terms of their usage of time and space.
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Papers by Anisa Al-Hafeedh