Papers by Avlonitis Markos
Journal in Computer Virology, 2007
Realistic models for worm propagation in the Internet have become one of the major topics in the ... more Realistic models for worm propagation in the Internet have become one of the major topics in the academic literature concerning network security. In this paper, we propose an evolution equation for worm propagation in a very small number of Internet hosts, hereinafter called a subnet and introduce a generalization of the classical epidemic model by including a second order spatial term which models subnet interactions. The corresponding gradient coefficient is a measure of the characteristic scale of interactions and as a result a novel scale approach for understanding the evolution of worm population in different scales, is considered. Results concerning random scan strategies and local preference scan worms are presented. A comparison of the proposed model with simulation results is also presented. Based on our model, more efficient monitoring strategies could be deployed.
In this paper, we present a use of computational geometric algorithms in an intelligent scenario ... more In this paper, we present a use of computational geometric algorithms in an intelligent scenario management system. Furthermore, we present the architecture of an intelligent scenario management system, appropriately combined with a computational geometric method, in order to present in a dynamic way the results of an inference mechanism of the above system. As an application of this we introduce a method based on computational geometric algorithms so that the total surface of the proposed logical tree of the proposed system scenario, may be transformed in to a correspondent 3-D geometrical space. The point of this application is to geometrically compare two scenarios, historical for example, of the same issue, in order to support critical thought in the learning process and thus help the educational researcher to extract useful conclusions and generally, achieve a positive educational outcome.
Information Sciences, 2015
The huge volume of available video content calls for methods that offer insight to the content wi... more The huge volume of available video content calls for methods that offer insight to the content without necessitating burdensome users' extra effort or being applicable to specific types or conditions. Based on experimentation on collective users' interactions on a controlled user-experiment, this work analyses the results collected following the argument that bell-shaped reference patterns are shown to significantly correlate with scenes of interest for each video, as designated by the viewers. Though, in order to ensure the correlation of results to bell-shaped reference patterns, aggregation of a number of users' interactions is required. In order to overcome such an impediment and adhere to a real-case cold start scenario, we propose a stochastic transformation of the aggregated users' interaction signal into a space defined by its correlation to the bell-shaped reference patterns that is shown to offer significant amelioration as to the percentage of users' interaction required in order to achieve comparable results to the original users' interaction space. Moreover, to ensure further the realistic character of the proposed scenario, given an amount of already collected users' interaction, the interaction of new users' is shown to be predictable using neural network time series prediction and modeling methods. The results received indicate increased accuracy on how one can predict the most important scenes from low quantity early data of users' interactions as well as future interaction of unique users. In practice, the proposed techniques might improve both navigation within videos on the web as well as video search results with personalised video thumbnails.
The role of fruit bearing percentage in olive fruit fly infestation is investigated through a sim... more The role of fruit bearing percentage in olive fruit fly infestation is investigated through a simulation model where the spatial law of dispersion distances were modeled via an appropriate exponential law. The dispersal of olive fruit flies was simulated for two distinct cases, an olive grove with no olive fruits and an olive grove with 100% olive fruit bearing. Results showed that when no olive fruits were present the olive fruit flies scatter in all directions away of the starting point, while when the olive grove is full of olive fruits the olive fruit flies form a cluster around the starting position with almost zero mean travel distance.
IFIP Advances in Information and Communication Technology, 2016
Olive fruit fly trap measurements are used as one of the indicators for olive grove infestation, ... more Olive fruit fly trap measurements are used as one of the indicators for olive grove infestation, and therefore, as a consultation tool on spraying parameters. In this paper, machine learning techniques are used to predict the next olive fruit fly trap measurement, given as input environmental parameters and knowledge of previous trap measurements. Various classification algorithms are employed and applied to different environmental settings, in extensive comparative experiments, in order to detect the impact of the latter on olive fruit fly population prediction.
2015 6th International Conference on Information, Intelligence, Systems and Applications (IISA), 2015
In this work a study for the role of different environmental factors to the evolution of olive fr... more In this work a study for the role of different environmental factors to the evolution of olive fruit fly, via an appropriate network of population traps is given. More explicitly, the olive fruit fly is a parasitic insect that infests olive groves in many countries. Through the use of a network of traps a simulation model was developed and used to simulate the dispersion of olive fruit fly inside a real olive grove for different environmental factors, such as different starting areas of olive fruit fly presence, different temperature sets as well as different drifting distances. Results showed that the level of infestation of the grove was not dependent on the limited areas the olive fruit fly emerged but on the drifting distance a fly could travel per day.
Statistical Aspects of Gradient Theory
Journal of the Mechanical Behavior of Materials, 2001
The paper contains new results on the statistical origin of gradient terms in the macroscopic rep... more The paper contains new results on the statistical origin of gradient terms in the macroscopic representation of stress and strain fields supported by engineering materials with appreciable heterogeneity at small scales. Physical arguments are employed to identify the correlation lengths defining the gradient coefficient in the corresponding Taylor series expansion of the random stress and strain fields. This allows to determine the number and type of stress and strain gradient terms which is important to include in the respective constitutive equations. The formulation also allows to incorporate microscopic fields with different statistical properties, including log-normal distributions. Depending on the type of correlation function employed, corresponding expressions for the gradient coefficients may be obtained.
A Stochastic Model Using Self-Organization to Explore the ICT Industry Evolution
2009 13th Panhellenic Conference on Informatics, 2009
Page 1. Abstract Motivated by the recent restructuring and convergence of the information techno... more Page 1. Abstract Motivated by the recent restructuring and convergence of the information technology (IT) and telecommunications (TELCO) industries and the business trend towards the formation of networks, this research ...
physica status solidi (a), 2006
A non-singular gradient elasticity solution for the dislocation self-energy is employed and compa... more A non-singular gradient elasticity solution for the dislocation self-energy is employed and compared to previous results for 1/6〈2023〉 partial dislocations fault in wurtzite GaN obtained by empirical potential calculations. Twenty-four previously obtained stable dislocation cores, twelve for each GaN polarity, are considered. It is shown that the gradient elasticity solution can be fitted to the atomistic simulations with good agreement and can be employed to trace the energetically favourable cores without the requirement of defining a core radius. As a byproduct of this continuum approach, a dislocation self-energy quantity is derived as a constant material property in terms of a gradient coefficient.
Mobile Networks and Applications, 2008
Local Area Networks (WLANs) represents an attractive, flexible and cost effective framework for r... more Local Area Networks (WLANs) represents an attractive, flexible and cost effective framework for realizing highquality, multichannel home audio applications. However, the unreliable nature of WLANs IP link frequently imposes significant playback quality degradation, due to delay or permanent loss of a number of transmitted digital audio packets. In this paper, a novel packet error concealment technique is presented, based on the spectral reconstruction of the statistical equivalent of a previously successfully received audio data packet. It is shown that the proposed data reconstruction scheme outperforms previously published error concealment strategies, in both terms of objective and perceptual criteria.
Journal of Interdisciplinary Mathematics, 2008
A statistical treatment of a random experimental signal in the presence of additive white noise b... more A statistical treatment of a random experimental signal in the presence of additive white noise by means of a Taylor expansion around the mean is studied. As a result, an expansion of the original random signal in terms of an arbitrary white noise process where the appropriate "signal information" was included into the corresponding expansion coefficients by means of higher statistical properties of the experimental signal was derived. Such an expansion can give access to statistical properties of the original signal of any order. An implication of the method to material deformation stochastic modeling is also examined. Indeed, using TEM micrographs of the experimentally observed dislocation patterns of PSBs during cyclic plastic deformation, we produce a random spatial pulse according to the location of each phase. This pulse is the input spatial signal of the aforementioned formalism and the final outcome is the estimation of the corresponding characteristic length of the pattern using the analytically thus producing phase signal. This value is compared with previous estimation of the characteristic length derived by considering specific dislocation mechanisms during cyclic deformation in order to examine the validity and robustness of the proposed methodology.
Journal of Graph Algorithms and Applications, 2007
In this paper we investigate the problem of classification between sports and news broadcasting. ... more In this paper we investigate the problem of classification between sports and news broadcasting. We detect and classify files that consist of speech and music or background noise (news broadcasting), and speech and a noisy background (sports broadcasting). More specifically, this study investigates feature extraction and training and classification procedures. We compare the Average Magnitude Difference Function (AMDF) method, which we consider more robust to background noise, with a novel proposed method. This method uses several spectral audio features which may be considered as specific semantic information. We base the extraction of these features on the theory of computational geometry using an Onion Algorithm (OA). We tested the classification procedure as well as the learning ability of the two methods using a Learning Vector Quantizer One (LVQ1) neural network. The results of the experiment showed that the OA method has a faster learning procedure, which we characterise as an accurate feature extraction method for several audio cases.
Proceedings of the 10th WSEAS international …, Jul 10, 2006
Abstract:-Dithering represents a well-established, attractive technique for minimizing the audibi... more Abstract:-Dithering represents a well-established, attractive technique for minimizing the audibility of the error produced during requantization of digital audio signals. However, it is also known that, as dither is applied as controlled, additive random noise prior requantisation, it also increases the overall quantization noise level and audibility. In this work, a novel dither generator is presented, based on a novel stochastic approach that derives a statistically equivalent signal to the original input. Using a sequence of tests as ...
Real time digital audio delivery over Wireless Local Area Networks (WLANs) represents an attracti... more Real time digital audio delivery over Wireless Local Area Networks (WLANs) represents an attractive, flexible and cost effective framework for realizing high-quality, multichannel home audio applications. However, the unreliable nature of WLANs IP link frequently imposes significant playback quality degradation, due to delay or permanent loss of a number of transmitted digital audio packets. In this paper, a novel packet error concealment technique is presented, based on the spectral reconstruction of the statistical equivalent of a previously successfully received audio data packet. It is shown that the proposed data reconstruction scheme outperforms previously published error concealment strategies, in both terms of objective and perceptual criteria.
The aim of the present work is to bring together new tools and developments in physics and comput... more The aim of the present work is to bring together new tools and developments in physics and computer science with new aspects in applied entomology. Our work elaborates on well known studies on applied entomology in population insect dynamics. A spatial evolution equation for olive fly population is proposed in order to describe more accurately outbreaks of insect populations by incorporating random movement or dispersion of the population. It turns out that dispersion causes both acceleration of population growth and shift of the high stable population equilibrium to even higher values thus producing population outbreak. Simulation results are also presented confirming theoretically predicted behavior of outbreaks in earlier times.
WebGIS Design & Implementation for Pest Life-cycle & Control Simulation Management: The Case of Olive-fruit Fly
Procedia Technology, Dec 31, 2013
ABSTRACT This work presents an integrated web geographical information system aiming at managing ... more ABSTRACT This work presents an integrated web geographical information system aiming at managing the simulation of the pests' life-cycle and control in a "Software as a Service" fashion. The approach adopted herein assumes that simulation processes take place in black-box functions and focuses on the management of all related information through thin clients such as common Internet browsers. As, current MVC frameworks in PHP do not offer native methods to handle such geographical data, in the proposed platform a small framework is designed and implemented aiming at inherently handling the associated geographical data of the platform.
Semantic video research has employed crowdsourcing techniques on social web video data sets such ... more Semantic video research has employed crowdsourcing techniques on social web video data sets such as comments, tags, and annotations, but these data sets require an extra effort on behalf of the user. We propose a pulse modeling method, which analyzes implicit user interactions within web video, such as rewind. In particular, we have modeled the user information seeking behavior as a time series and the semantic regions as a discrete pulse of fixed width. We constructed these pulses from user interactions with a documentary video that has a very rich visual style with too many cuts and camera angles/frames for the same scene. Next, we calculated the correlation coefficient between dynamically detected user pulses at the local maximums and the reference pulse. We have found when people are actively seeking for information in a video, their activity (these pulses) significantly matches the semantics of the video. This proposed pulse analysis method complements previous work in contentbased information retrieval and provides an additional user-based dimension for modeling the semantics of a web video.
The aim of the present work is to bring together new tools and developments in physics and comput... more The aim of the present work is to bring together new tools and developments in physics and computer science with new aspects in applied entomology. Our work elaborates on well known studies on applied entomology in population insect dynamics. A spatial evolution equation for olive fly population is proposed in order to describe more accurately outbreaks of insect populations by incorporating random movement or dispersion of the population. It turns out that dispersion causes both acceleration of population growth and shift of the high stable population equilibrium to even higher values thus producing population outbreak. Simulation results are also presented confirming theoretically predicted behavior of outbreaks in earlier times.
A Stochastic Model Using Self-Organization to Explore the ICT Industry Evolution
2009 13th Panhellenic Conference on Informatics, 2009
Page 1. Abstract Motivated by the recent restructuring and convergence of the information techno... more Page 1. Abstract Motivated by the recent restructuring and convergence of the information technology (IT) and telecommunications (TELCO) industries and the business trend towards the formation of networks, this research ...
A statistical treatment of a random experimental signal in the presence of additive white noise b... more A statistical treatment of a random experimental signal in the presence of additive white noise by means of a Taylor expansion around the mean is studied. As a result, an expansion of the original random signal in terms of an arbitrary white noise process where the appropriate "signal information" was included into the corresponding expansion coefficients by means of higher statistical properties of the experimental signal was derived. Such an expansion can give access to statistical properties of the original signal of any order. An implication of the method to material deformation stochastic modeling is also examined. Indeed, using TEM micrographs of the experimentally observed dislocation patterns of PSBs during cyclic plastic deformation, we produce a random spatial pulse according to the location of each phase. This pulse is the input spatial signal of the aforementioned formalism and the final outcome is the estimation of the corresponding characteristic length of the pattern using the analytically thus producing phase signal. This value is compared with previous estimation of the characteristic length derived by considering specific dislocation mechanisms during cyclic deformation in order to examine the validity and robustness of the proposed methodology.
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Papers by Avlonitis Markos