Christos H. Skiadas's research while affiliated with Technical University of Crete and other places
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Publications (58)
The original version of chapter 20 and chapter 33 was revised. The original version of these chapters was inadvertently published with incorrect affiliation.
Circuit of the non-autonomous two channel chaotic generator that contains two operational amplifiers, four capacitors, two resistors and two sinusoidal voltage sources is presented. Regimes of chaotic behavior was modeled by using NI’s software MultiSim. Analysis of chaotic attractor, time series and spectra are shown. The layout and 3D model of re...
In this work Total Deaths (/million) to Total Cases (% population) of Covid-19 data from https://ourworldindata.org/coronavirus website including 16 countries (Europe: 10, America: 3, Asia: 2, Oceania: 1) is presented and studied. The data period is from January 2020 to 23 September 2021. TheTime Period is divided to 3 Parts based on chart data cur...
Healthy life expectancy describes the health status of a population by estimating the number of years a newborn is expected to live in good health. Life expectancy at birth estimates the average longevity of a newborn, given the mortality schedule observed in a period. This paper aims to analyze comparatively the developments of both indicators sin...
The estimation of Healthy life expectancy (HLE) is an old venture, an effort of numerous researchers worldwide during the last decades to develop a suitable, effective and precise relevant methodology. The World Health Organization (WHO) has already developed an efficient but highly complicated procedure based on the “Global Burden of Disease Study...
The access control and management system is actually just an “INTELLIGENT LOCK” on your door. Of course, the concept of “lock” may include a mass of devices that block the passage into the room (building, territory, etc.). All these devices in access control systems are referred to as actuators. In this paper, we presented a simple RFID reader for...
In this work the Chaotic Nature of the Covid-19 Pandemic data is explored. The Total Deaths (/million) to Total Cases (% population) of Covid-19 data from https://ourworldindata.org/coronavirus website are studied. Large 28 day-delays lead to characteristic Limit Cycles while the lag between applied and adopted measures tend to form characteristic...
For demonstrate nonlinear behavior we used new one-dimensional modified logistic system. Analysis, equation and system conditions are presented. For analysis of the iteration series with different parameter r and computer modelling was used one of the modern software environment LabView. Programming code and nominal components are also presented. F...
Circuit realization of the inductance equivalent that contains two operational amplifiers, one capacitor, and four resistors is presented. The mathematical equation that allow convert inductor value to resistance of potentiometer is shown. Computer modeling results of the algorithm for calculate inductance was realized in the modern software LabVie...
The Healthy Life Expectancy (HLE) in Brazil 2003 was estimated by Romero et al (2005) by using the Sullivan method and data from the World Health Survey carried out in Brazil in 2003. Here we use a Direct method to estimate the Healthy Life Years Lost (HLYL) and then the HLE. This is done after the analytic derivation of a more general model of sur...
[from Preface] This book is a collective work by a number of leading scientists, analysts, engineers, mathematicians and statisticians, who have been working on the front end of data analysis. The chapters included in this collective volume represent a cross-section of current concerns and research interests in the above-mentioned scientific areas....
BIG DATA, ARTIFICIAL INTELLIGENCE AND DATA ANALYSIS SET Coordinated by Jacques Janssen
Data analysis is a scientific field that continues to grow enormously, most notably over the last few decades, following rapid growth within the tech industry, as well as the wide applicability of computational techniques alongside new advances in analytic tools...
Healthy life expectancy (HLE) estimates are achieved after systematic work done by a large group of researchers all over the world over the last few decades. The most successful estimate was termed as HALE and is provided by the World Health Organization (WHO) on their related website. In this chapter, the authors solve the problem of finding the H...
Gathering the proceedings of the 13th CHAOS2020 International Conference, this book highlights recent developments in nonlinear, dynamical and complex systems. The conference was intended to provide an essential forum for Scientists and Engineers to exchange ideas, methods, and techniques in the field of Nonlinear Dynamics, Chaos, Fractals and thei...
We develop a first exit time methodology to model the life time process of a complicated system. We assume that the functionality level of a complicated system follows a stochastic process during time and the end of the functionality of the system comes when the functionality function reaches a zero level. After solving several technical details in...
In this paper, the process of pulse transformation of analog nonlinear signals is presented. For demonstrate of this process we used non-autonomous chaotic generator as a main part that generate nonlinear signals. Components with nominal values and electronic circuit that allows to realization of pulse transformation are presented. This circuit con...
Circuit realization of the generator that demonstrate chaotic behavior is presented. This circuit contains three operational amplifiers, three capacitors, one diode, eight resistors, and one voltage source. The system's behavior was investigated through numerical simulations, by using well-known tools of nonlinear theory, such as phase portrait, ch...
Healthy Life Expectancy (HLE) estimates are achieved after systematic work of a large group of researchers all over the world during last decades. The most successful estimate was termed as HALE and is provided by the World Health Organization (WHO) in the related website. Having established a methodology of data collection and handling the HLE can...
The analytic derivation of a more general model of survival-mortality and the estimation of a parameter bx related to the Healthy Life Years Lost (HLYL) is followed by the formulation of a computer program providing results similar to those of the World Health Organization for the Healthy Life Expectancy (HALE) and the corresponding HLYL estimates....
Matsushita et al. (J Clin Epidemiol 45(10):1165–1175, 1992) showed an interesting finding. They observed that the shape parameter of the Weibull model presented systematic changes over time and age when applied to mortality data for males and females in Japan. They have also estimated that this parameter was smaller in the 1891–1898 data in Japan c...
The Healthy Life Years Lost Methodology (HLYL) is introduced to model and estimate the Health Expenditure in Japan in 2011. The HLYL theory and estimation methods are presented in our books in the Springer Series on Demographic Methods and Population Analysis vol. 45 and 46 titled: “Exploring the Health State of a Population by Dynamic Modeling Met...
The World Health Organization defines health as: “a state of complete physical, mental, and social well-being, not merely the absence of disease or infirmity”.
Having established a quantitative methodology of estimating the health state function of a population, we can calculate the gradual loss of health due to aging. According to the theory developed the health state is at level one at birth and gradually declines to zero at death. Note that the health state of an individual as a stochastic process (an...
The classical Chua’s circuit that realizes chaotic behavior is presented. This circuit having a simple nonlinear element designed to be accurately piecewise-linear modelled. The circuit was modelled by using MultiSim software environment. The system’s behavior is investigated through numerical simulations, by using well-known tools of nonlinear the...
A novel simple autonomous optoelectronic circuit that demonstrate chaotic behavior is presented. In this circuit a lightemitting diode is a simple optoelectronic element. The mathematical model that contain exponential nonlinearity and six terms with two parameters is described by three first-order ordinary differential equations. A great interest...
Gathering the proceedings of the 12th CHAOS2019 International Conference, this book highlights recent developments in nonlinear, dynamical and complex systems. The conference was intended to provide an essential forum for Scientists and Engineers to exchange ideas, methods, and techniques in the field of Nonlinear Dynamics, Chaos, Fractals and thei...
This book provides theoretical and applied material for estimating vital parts of demography and health issues including the healthy aging process along with calculating the healthy life years lost to disability. It further includes the appropriate methodology for the optimum health expenditure allocation. Through providing data analysis, statistic...
The analytic derivation of a more general model of survival-mortality and the estimation of a parameter bx related to the Healthy Life Years Lost (HLYL) is followed with the formulation of a computer program providing results similar to those of the World Health Organization for the Healthy Life Expectancy (HALE) and the corresponding HLYL estimate...
Introduction. General scientific fields where can be used non-autonomous circuits that realize chaotic behavior and generate chaotic oscillations are presented. Main characteristic about non-autonomous chaotic circuits is described. For modelling, analysis and demonstrate results was selected MultiSim software environment.
Modelling of Non-Linear E...
Matsushita et al (1992) have done an interesting finding. They observed that the shape parameter of the Weibull model presented systematic changes over time and age when applied to mortality data for males and females in Japan. They have also estimated that this parameter was smaller in the 1891-1898 data in Japan compared to the 1980 mortality dat...
This chapter presents several important methods of modeling and estimation of mortality and health. It provides a short historical valuation of the life tables and briefly discusses the most spread methods for the evaluation of mortality laws. Among the methods are the famous Gompertz model, the Gompertz‐Makeham model, the Heligman‐Pollard model an...
The Healthy Life Years Lost Methodology (HLYL) is introduced to model and estimate the Health Expenditure in Japan in 2011. The HLYL theory and estimation methods are presented in our books in the Springer Series on Demographic Methods and Population Analysis vol. 45 and 46 titled: Exploring the Health State of a Population by Dynamic Modeling Meth...
We present a method to formulate the Health State or Health Status curve of a population from the Gompertz model thus providing a useful tool to demographers, actuaries, policy makers, health people and organizations and sociologists. The model is presented along with a simple first exit time model and another “Best Fit” model. A method of finding...
We use an advanced methodology based on the mortality rate of a population to explore the healthy life expectancy (HALE) estimates of the World Health Organization (WHO) from the Global Burden of Disease Study. First we calculate the loss of healthy life year estimator (LHLY) and then the healthy life expectancy (HLE). We use the full life tables f...
Following the recent publication of our book on “Exploring the Health State of a Population by Dynamic Modeling Methods” (DOI https://doi.org/10.1007/978-3-319-65142-2) in “The Springer Series on Demographic Methods and Population Analysis” we provide this brief presentation of the main findings and improvements regarding the Health State of a Popu...
This is a twofold paper, firstly aiming to apply a method for the calculation of healthy life expectancy to the well-known BRIICS countries. This method is based on the μx distribution of a full life table. However, for many countries of the world such data is virtually absent or problematic, and in reality, only available in the form of an abridge...
The period 1961–2013 is of great importance in Modern Greek History. In the 1960s several efforts at reform were followed by a period of political turmoil and finally the dictatorship of the Colonels in April 1967. The country returned to democratic normality in 1974. In 1981 Greece became a full member of the European Union and until 2008 followed...
We introduce and apply several methods for exploring the human lifespan process in connection to the publication by Dong et al. 2016 on “Evidence for a limit to human lifespan” in Nature in 2016 and the debate emerging mainly published in Nature as well in 2017 along with authors replies. We found it constructive to propose and test several applied...
We present a first exit time theory of a stochastic process. The general model is analytically derived according to the first exit time or hitting time theory for a stochastic process crossing a barrier. The derivation lines follow the transition probability densities from the Fokker-Planck equation. Then we find the probability density form and th...
This book collects interrelated lectures on fractal dynamics, anomalous transport and various historical and modern aspects of plasma sciences and technology.
The origins of plasma science in connection to electricity and electric charges and devices leading to arc plasma are explored in the first contribution by Jean-Marc Ginoux and Thomas Cuff....
Citations
... The intersection of line BD with the x-axis indicates an inflection-turning point where d 2 I dt 2 = 0 within the KdV-SIR equation. An analysis of real data within the I-I space was recently performed byDimotikalis and Skiadas [2022]. ...
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... It also occurs spontaneously in some systems with artificial components, such as the stock market and economic conditions [38,39]. This research defines the word chaos according to common usage; "chaos" means "a state of disorder" [40,41]. The new chaotic system is shown to be multi-stable with simultaneous chaotic orientations [42]. ...
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... Chaos has been shown to be useful in a variety of disciplines, such as mathematics [1][2][3][4][5][6][7], finance [8,9], information processing and telecommunication security systems [10,11]. ...
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... The analyses presented do not extend to estimations of disability free life expectancy, healthy life expectancy or healthy life years lost. A method has been developed for this (74) and applied to life expectancy data from dogs in the UK (15) and Japan (13) for different breeds and cross-breed dogs (75). The Banfield database provides additional opportunities to explore healthy life expectancy and specific disease-associated life expectancy in future work. ...
... Weibull distribution can use probability values to infer distribution parameters [39], and it is widely used in data processing of various life tests and the design of strength failure distribution functions. In this article, Weibull distribution was used as the theoretical basis of concrete life evaluation, and the life evaluation model was established through the least-square method. ...
... There are many different scheme-technical realizations of chaotic generators [26][27][28][29][30][31]. Great interest are non-autonomous generators that demonstrate chaotic behavior. ...
... Nonlinear oscillations are very interesting for analysis, computer modelling of the main information properties and application in the different areas, such as optics [1], radio engineering [2][3][4][5][6][7][8][9], mathematics [10][11][12][13], economics [14][15][16], biology [17]. ...
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... Chaotic theory used in many areas, such as biology [1][2][3], ecology [4,5], economy [6][7][8], optics [9], mathematics [10,11], memristor [12,13], security communication systems [14,15], etc. Many different electronics circuits generated chaotic oscillations [16][17][18][19][20][21][22][23][24][25][26][27][28][29]. One of the circuit element must be used inductor. ...
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... The starting point of this work is the collection of cluster validation indexes presented in Hennig (2019). These are indexes defined in order to provide a multivariate characterisation of a clustering, individually measuring aspects such as between-cluster separation, within-cluster homogeneity, or representation of the overall dissimilarity structure by the clustering. ...
... The first-exit time processes arise naturally in the studies of various disciplines. For example, this is used in [42] to model the death probability density function for a decaying stochastic process that represents either the end of functionality for a machine, or a zero health state for an organism. The paper [22] provides an expanded first-exit time density function that expresses the human death distribution. ...
