Spiros Michalakopoulos

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0747-5632/$ see front matter 2012 Elsevier Ltd. A http://dx.doi.org/10.1016/j.chb.2012.03.019 ⇑ Corresponding author. Present address: Universit imental Psychology, 12a Priory Road, Bristol BS8 1TU 117 3317898. E-mail address: groen.martin@gmail.com (M. Groe Video-mediated communication (VMC) has become a popular communication medium. However, research to(More)
Audiovisual group communication systems deal with a large number of video streams, and, unlike less advanced videoconferencing systems, require intelligence for selecting adequate views for each of the connected rooms, in order to convey best what is happening in the other locations. Such a decision making component, in our implementation called(More)
An interesting problem in music information retrieval is to classify songs according to rhythms. A rhythm is represented by a sequence of “Quick” (Q) and “Slow” (S) symbols, which correspond to the (relative) duration of notes, such that S = 2Q. Christodoulakis et al. presented an efficient algorithm that can be used to classify musical sequences according(More)
An interesting problem in musicology is to classify songs according to rhythms. A rhythm is represented by a sequence of “Quick” (Q) and “Slow” (S) symbols, which correspond to the (relative) duration of notes, such that S = 2Q. Recently, Christodoulakis et al. [3] presented an efficient algorithm that can be used to classify musical texts according to(More)
Three problems that arise from electrocardiogram (ECG) interpretation and analysis are presented, followed by algorithmic solutions based on a combinatorial model. First, the beat classification problem is discussed and possible solutions are investigated. Secondly, given the R R -intervals, which can be determined using this combinatorial model, or any Q R(More)
Motivated by the identification of the musical structure of pop songs, we introduce combinatorial problems involving overlays (non-overlapping substrings) and the covering of a text t by them. We present 4 problems and suggest solutions based on string pattern matching techniques. We show that decision problems of this type can be solved using an(More)
Differentially methylated regions (DMRs) are segments or islands of consecutive sequence positions, showing methylation enrichment or depletion compared to each other in different samples or tissues. The identification of DMRs is a crucial first step in the discovery of biomarkers for noninvasive prenatal diagnosis of aneuploidies such as Trisomy 21. In(More)
A synchronizing word of a deterministic automaton is a word in the alphabet of colors (considered as letters) of its edges that maps the automaton to a single state. A coloring of edges of a directed graph is synchronizing if the coloring turns the graph into a deterministic finite automaton possessing a synchronizing word. The road coloring problem is the(More)