Konstantinos Margaritis

© IC-SCCE MATRIX – VECTOR MULTIPLICATION ON A CLUSTER OF WORKSTATIONS (2009)

Theodoros Typou, Vasilis Stefanidis, Panagiotis Michailidis, Konstantinos Margaritis

prediction model. Abstract. The multiplication of a vector by a matrix is the kernel operation in many algorithms used in scientific computation. This paper outlines four parallel matrix – vector...

© IC-SCCE IMPLEMENTING MATRIX MULTIPLICATION ON AN MPI CLUSTER OF WORKSTATIONS (2008)

Theodoros Typou, Vasilis Stefanidis, Panagiotis Michailidis, Konstantinos Margaritis

Abstract. The matrix multiplication is one of the most important computational kernels in scientific computing. Consider the matrix multiplication product C = A×B where A, B, C are matrices of size...

Multimedia Authoring Tools: The Quest for an Educational Package (2008)

Theodore H. Kaskalis, Theodore D. Tzidamis, Konstantinos Margaritis

Since the explosion in multimedia computing, educators have been trying to work their way towards integrated human-computer interaction. Consequently, a large number of multimedia tools have been...

ACOUSTIC-TO-ARTICULATORY INVERSION OF SPEECH: A REVIEW (2007)

Asterios Toutios, Konstantinos Margaritis

Abstract: In this article, we review a specific speech processing research area called acoustic-to-articulatory inversion of speech, or simply speech inversion, which has attracted many researchers...

PARALLEL EVOLUTIONARY ALGORITHMS ON MPI (2007)

Jason Digalakis, Konstantinos Margaritis

Abstract. Parallel Evolutionary algorithms have been developed to reduce the running time of serial Evolutionary algorithms. Two major paradigms for parallel programming, Message Passing and Shared...

Vectorization of algorithm Adler32 using altivec. freevec.org whitepaper (2005)

Konstantinos Margaritis

This paper describes the process of vectorization of the Adler32 hashing/checksum algorithm using Altivec. Altivec is the vector unit found in some PowerPC processors, namely...

On the Acoustic-to-Electropalatographic Mapping (2005)

Asterios Toutios, Konstantinos Margaritis

Electropalatography is a well established technique for recording information on the patterns of contact between the tongue and the hard palate during speech. It leads to a stream of binary vectors,...

Mapping between the Speech Signal and Articulatory Trajectories (2005)

Asterios Toutios, Konstantinos Margaritis

The main target of this paper is a comparison of parametric representations for the task of mapping the speech signal onto Electromagnetic Articulography trajectories. The principal method used for...

A Support Vector Approach to the Acoustic-to-Articulatory Mapping (2005)

Asterios Toutios, Konstantinos Margaritis

We report work on mapping the acoustic speech signal, parametrized using Mel Frequency Cepstral Analysis, onto electromagnetic articulography trajectories from the MOCHA database. We employ the...

Mapping the Speech Signal onto Electromagnetic Articulography Trajectories Using Support Vector Regression (2005)

Asterios Toutios, Konstantinos Margaritis

We report work on the mapping between the speech signal and articulatory trajectories from the MOCHA database. Contrasting previous works that used Neural Networks for the same task, we employ...

Learning Articulation from Cepstral Coefficients (2005)

Asterios Toutios, Konstantinos Margaritis

We work on a special case of the speech inversion problem, namely the mapping from Mel Frequency Cepstral Coeeficients onto articulatory trajectories, derived by EMA. We employ Support Vector...

Estimating Tongue-Palate Contact Patterns from the Speech Signal (2004)

Asterios Toutios, Konstantinos Margaritis

Electropalatography (EPG) is a technique that determines the contact patterns between the tongue and the hard palate during speech. In one of its most common forms, it utilizes an artificial palate...

A Parallel Memetic Algorithm for Solving (2001)

Optimization Problems Jason, Jason Digalakis, Konstantinos Margaritis

this paper we examine 10 di#erent functions in order (a) to test specific parameter of a parallel execution of memetic algorithms and (b) to evaluate the general computational behavior of MAs. The...

A Performance Comparison of Parallel Genetic and Memetic Algorithms using MPI. (2000)

Jason Digalakis, Konstantinos Margaritis, K. G. Margaritis

In this paper we propose a parallel memetic algorithm which combines population-based method with guided local search (GLS) procedure. In the proposed algorithm, a GLS procedure is applied to each...