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- 20. V. Zarikas , A. Christopoulos, V.L. Rendoumis «Thermodynamic description of the dynamic evolution of a stock market index»
- 21. M. – P. Koutsovasili, N. Papanikolaou, V. Zarikas, C. Kyritsi «Statistical analysis of accidents regarding the use of elevators in Greece»
- 22. A. Deltsidou, C. Lemonidou, Vasilios Zarikas, V. Matziou, C. S. Bartsocas “Oligomenorrhea in adolescents with Type 1 Diabetes Mellitus: relationship with the glycaemic control”
- 23. “Volatility of a stock index as thermodynamic fluctuation” V. Zarikas, A. Christopoulos, V.L. Rendoumis
- V. Zarikas, V. Gikas, C.P. Kitsos
- ΑΝΑΦΟΡΕΣ - CITATIONS 161 citations
AbstractIn this paper an analysis is presented for the Athens Stock Index (ASI). A model is introduced that proposes a new methodology and explanation for the up and down trends of the ASI. Closing prizes of the ASI exhibit exponential laws. This behavior leads us to put forward an alternative formalism based on the thermodynamic concepts of Physics in order to study the macroscopic properties of stock markets. Hence, we introduce Newton’s law of cooling as a pattern for up and down trends of the ASI. 20. V. Zarikas , A. Christopoulos, V.L. Rendoumis «Thermodynamic description of the dynamic evolution of a stock market index» "European Journal of Economics, Finance and Administrative Sciences" Issue 16 (2009), ISSN 1450-2887 Abstract: In this paper we present a phenomenological analysis for the time evolution of a Stock Index. We introduce a model that represents a new methodology for the description of the up and down trends of a stock index and we present an example referring to the Athens Stock Index (ASI). The day-by-day closing prizes of the ASI exhibit exponential laws. This behavior supports an alternative formalism based on the thermodynamic concepts of Physics in order to study the macroscopic properties of stock markets. Hence, we introduce Newton’s law of cooling as a pattern for up and down trends of the ASI. The results encourage us to construct a more complete thermodynamic model in order to understand the time evolution and the behavior of the ASI. 21. M. – P. Koutsovasili, N. Papanikolaou, V. Zarikas, C. Kyritsi «Statistical analysis of accidents regarding the use of elevators in Greece» Proceedings of the International IAEE Conference on Vertical Transportation Technologies, Elevcon 2010” held in Lucerne 2-6 June 2010. Abstract: A statistical survey is being carried out by Lamia Institute of Technology research team, regarding accidents on elevators and escalators in Greece on the occasion of recent fatal accidents during past twelve years. The aim of this research is to provide the essential information needed to focus attention on certain crucial mistakes and misguided actions, in order to make the use of both lift and rolling stairs / corridors safer in the future. Results will help preventing similar accidents for the technical staff and the users, as well as designing and teaching a new culture and attitude from the users’ side. This work presents some first statistical outcomes and results from this analysis. 22. A. Deltsidou, C. Lemonidou, Vasilios Zarikas, V. Matziou, C. S. Bartsocas “Oligomenorrhea in adolescents with Type 1 Diabetes Mellitus: relationship with the glycaemic control” Eur J Obstet Gynecol Reprod Biol. 2010 Nov;153(1):62-6. Epub 2010 Aug 11. Abstract: Objective: To investigate oligomenorrhea in adolescents with type 1 diabetes and the possible relation with the glycaemic control. Study Design: The study group consisted of 81 female adolescents with type 1 diabetes with a mean age of 15.0 years (range 12-18) and the control group of 205 healthy adolescents with a mean age of 15.5 years (range 12-18). Data on menstruation were collected by two parallel self-administered questionnaires. Oligomenorrhea was defined as having menstrual cycle length longer than 36 days during the last year. The metabolic control of diabetes was evaluated by calculating the mean value of HbA1c during the last year. Results: Age at menarche was greater for adolescents with type 1 diabetes (11.7 ± 1.2 vs. 12.2 ± 1.4, p-value<0.000) compared to healthy age-matched controls. Logistic regression analysis with oligomenorrhea as the dependent binary variable revealed an odds ratio equal to 7.8 (95% CI 3.411-17.853) for adolescents with type 1 diabetes (p-value<0.000). Finally, a second logistic regression analysis, concerning only patients of type 1 diabetes and for the same binary, estimated an odds ratio 4.8 (95 % CI 1.784-13.057, p-value<0.002) for HbA1c, and an odds ratio 5.3 (95 % CI 1.821-15.130, p-value<0.002) for the frequency of hypoglycaemia Conclusion: In adolescents with type 1 diabetes menarche occurs later while oligomenorrhea is more frequent. The relative risk for having oligomenorrhea is larger for increased values of HbA1c or for larger values of frequency of hypoglycaemia.
This paper describes a new empirical model that has been developed in order to encompass the phenomena of up and down trends and the related volatility of stock indices. The approach follows ideas established in the context of statistical thermodynamics. The model is based on the thermodynamic behaviour of a system in contact with reservoirs and it is capable to describe the macroscopic properties of stock markets. A novel inherent to the model phenomenological explanation is proposed for the descprition of the volatility of a stock index. The model encompasses a mechanism for the fluctuations of the stock market indices. 24. V. Zarikas, V. Gikas, C.P. Kitsos «Evaluation of the optimal design “cosinor model” for enhancing the potential of robotic theodolite kinematic observations» Measurement, Volume 43, Issue 10, December 2010, Pages 1416-1424 Abstract: The aim of the present work is to assess and to demonstrate the benefits of adopting optimal experimental design theory and techniques in order to enhance the potential of field data recorded using conventional geodetic instruments. More specifically, this research focuses on Robotic Total Stations (RTS) and in kinematic applications of geodetic positioning that exhibit a cyclic/periodic pattern of motion. The computational approach adopted follows from the principles of c- and D-optimal design criteria. Data processing involves computing the amplitude of motion in two ways; (a) using a sample of consecutively ordered data recordings and (b) using a sample respecting the optimal design criteria. Analysis, confirms the utility of the method resulting an improvement (i.e. a reduction) of the oscillation amplitude variance. This conclusion applies particularly at higher frequencies of oscillations (>1 Hz). This is important as at higher frequencies the performance of RTS deteriorates, and hence large variances occur ΑΝΑΦΟΡΕΣ - CITATIONS 161 citations Στο Παράρτημα Α εμφανίζονται αναλυτικά τα citations για κάθε δημοσίευση. ΔΙΔΑΚΤΙΚΗ ΕΜΠΕΙΡΙΑ
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