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The Evelpidon Military Academy is the Officer cadet school of the Greek Army and the oldest tertiary level educational institution in Greece. It was founded in 1828 in Nafplion by Ioannis Kapodistrias, the first Governor of the modern Greek State.The institution was created to provide officers for all the Arms of the Hellenic Army , as well as some of the Corps . By contrast, officers in the Legal Corps, the Medical Corps, the Finance Corps, and the Auditing Corps are graduates of the Corps Officers Military Academy , with the exception of nurse officers in the Medical Corps, who are graduates of the Nurse Officer Academy . The School also trains cadets on behalf of foreign allied countries.The origin of the designation "Evelpides" is from a passage by the historian Thucydides, where the Corinthians describe their adversaries, the Athenians, as "adventurous beyond their power, daring beyond their judgment, and bearers of high hopes when in danger" . Wikipedia.

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Pham V.-T.,Hanoi University of Science and Technology | Volos C.,Hellenic Military Academy | Jafari S.,Amirkabir University of Technology | Wei Z.,Wuhan University | Wang X.,City University of Hong Kong
International Journal of Bifurcation and Chaos | Year: 2014

This paper introduces a new no-equilibrium chaotic system that is constructed by adding a tiny perturbation to a simple chaotic flow having a line equilibrium. The dynamics of the proposed system are investigated through Lyapunov exponents, bifurcation diagram, Poincaré map and period-doubling route to chaos. A circuit realization is also represented. Moreover, two other new chaotic systems without equilibria are also proposed by applying the presented methodology. © 2014 World Scientific Publishing Company.

Volos C.K.,Hellenic Military Academy | Kyprianidis I.M.,Aristotle University of Thessaloniki | Stouboulos I.N.,Aristotle University of Thessaloniki
Journal of Engineering Science and Technology Review | Year: 2013

In this work a new encryption scheme, which is realized with a Chaotic Pseudo-Random Bit Generator (CPRBG) based on a Logistic map, is presented. The proposed system is used for encrypting text files for the purpose of creating secure data bases. The Logistic map is the most studied discrete nonlinear map because it has been used in many scientific fields. Also, the fact, that this discrete map has a known algebraic distribution, made the Logistic map a good candidate for use in the design of random bit generators. The proposed CPRBG, which is very easily implemented, uses the X-OR function, in the bit sequences, that are produced by two Logistic maps with different initial conditions and system's parameters, to achieve better results concerning the "randomness" of the produced bits sequence. The detailed results of the statistical testing on generated bit sequences, done by the most well known tests of randomness: the FIPS-140-2 suite tests, confirmed the specific characteristics expected of random bit sequences. © 2013 Kavala Institute of Technology.

Volos C.K.,Hellenic Military Academy | Kyprianidis I.M.,Aristotle University of Thessaloniki | Stouboulos I.N.,Aristotle University of Thessaloniki
WSEAS Transactions on Systems | Year: 2012

In this paper, the modelization of coupling between two systems of economic cycles, which adopt the idea that economic fluctuations result from endogenous interactions, is studied. The nonlinear system, which describes the economic system, is a modification of the 2-dimensional Van der Pol oscillator. The coupling strength represents the effect of the capital inflow between the two conjugated economic systems, with identical economic aggregates, such as savings, gross domestic product and foreign capital inflow. Numerical simulations reveal the richness of the coupled system's dynamic behavior, showing interesting nonlinear dynamical and synchronization phenomena. Various tools of nonlinear theory, such as bifurcation diagrams, phase portraits and Lyapunov exponents, for the study of the proposed coupling methods (unidirectional and bidirectional), have been used.

Aim. Assessment of elite athletes' physiological characteristics is necessary in order to develop proper training, talent detection and identification programs. Since women's soccer is just at the beginning, there are no data available on elite players. Aim of this study was to investigate anthropometric and physiological characteristics of elite Greek female soccer players. Methods. Forty-five members of two division I teams participated in our study during their routine health-related and sport-related fitness screening. Results. Body fat was 22.65±1.91 %, players' somatotype mesomorphic endomorph (5.2-4.9-1.9) and work capacity in heart rate 170 was 2.13±0.47 W-kg-1. Peak anaerobic power was 9.65±0.58 W-kg-1, fatigue index 46.3±7.75% (Wingate test), whilst maximal anaerobic power was 12.39±1.41 W-kg-1, maximal force 163.81 ±30.56 N and maximal velocity 185.03±11.77 revolutions per minute (force-velocity test). Starters players had lower % body fat (21.8% vs. 24.27%, t43=-2.23, P<0.05), and higher work capacity in heart rate 170 (2.3 W-kg-1 vs. 1.98 W-kg-1, t43=2.36, P<0.05) and peak anaerobic power (9.87 W-kg -1 vs. 9.43 W-kg-1, t40=2.31, P<0.05) than substitutes. Conclusion. Our findings confirmed previous suggestions about the good aerobic and anaerobic profile of women's soccer. However, what is novel is the quantification of this physiological profile in elite Greek players and the role of physical fitness on starters' selection.

Lazopoulos K.A.,National Technical University of Athens | Lazopoulos A.K.,Hellenic Military Academy
European Journal of Mechanics, A/Solids | Year: 2011

The governing equilibrium equations for strain gradient elastic thin shallow shells are derived, considering nonlinear strains and linear constitutive strain gradient elastic relations. Adopting Kirchhoff's theory of thin shallow structures, the equilibrium equations, along with the boundary conditions, are formulated through a variational procedure. It turns out that new terms are introduced, indicating the importance of the cross-section area in bending of thin plates. Those terms are missing from the existing strain gradient shallow thin shell theories. Those terms highly increase the stiffness of the structures. When the curvature of the shallow shell becomes zero, the governing equilibrium for the plates is derived. © 2010 Elsevier Masson SAS. All rights reserved.

Vasiliki K.,Hellenic Military Academy
Journal of Military and Veterans' Health | Year: 2014

Background: The Military Fitness Training Leader (MFTL) is considered a parameter that affects the efficiency of the Hellenic Army Physical Readiness Training (APRT). Purpose: The competencies of 5 different types of Greek MFTLs were assessed and compared according to the opinions of the Regular Army Personnel. Material and Methods: ANOVA corrected by post hoc comparisons were used to compare the selected opinions coming from 2864 survey questionnaires. The statistical significance was indicated up to 0.05 to compare the differences for all 5 types MFTLs graded by 3 different groups: Senior Officers, Junior Officers, and Non- Commissioned Officers/Permanent Enlisted Soldiers. Results: The Senior Officers scored the “Officer” as the best MFTL and the “Physical Education Graduate” as the highest contributors to the APRT’s effectiveness. Junior Officers and Non-Commissioned Officers/Permanent Enlisted Soldiers scored the “Physical Education Graduate” as being more useful as MFTL, although being seldom applied to APRT programs. The Officers’ military experience and leadership specialisation combined with the Physical Education Graduate’s professionalisation has been revealed as the main characteristics of an effective profile for a MFTL. Conclusion: The results, reinforced by similar research in the field, indicate that the Hellenic army should focus on creating professional standards to achieve a more efficient MFTL training program. Conflict of Interest: There were no financial or personal conflicts of interest for this study. The results of the present study do not constitute endorsement of the product by the author or the Journal. © 2014, Australian Military Medicine Association. All rights reserved.

Lazopoulos A.K.,Hellenic Military Academy
Acta Mechanica | Year: 2014

Non-smooth strain gradient fields are studied in bending beams, in the context of strain gradient elasticity. It is found that strain fields with continuous curvature, but discontinuous curvature derivatives (evolutes) are possible. The pure bending and buckling problems of a simply supported beam are investigated. © 2013 Springer-Verlag Wien.

Papagiannakis R.G.,Hellenic Military Academy
Energy Conversion and Management | Year: 2013

One of the methods to achieve curtailment of diesel engine emissions is the conversion of conventional diesel engines to using natural gas as a supplement to normal diesel fuel. In this type of engines most of the engine power output is provided by the gaseous fuel, while a pilot amount of diesel fuel is used as ignition source of the gaseous fuel-air mixture. However dual fuel operating mode, in comparison to conventional diesel one, suffers from low brake thermal efficiency and high carbon monoxide emissions. By applying a two-zone phenomenological model, the present work studies the effect of air inlet preheating and exhaust gas recirculation on the performance and exhaust emissions of a pilot ignited dual fuel diesel engine. The main objectives are to record and comparatively evaluate the relative impact that each one of the above mentioned parameters has on the engine performance characteristics and emitted pollutants. Moreover, it deals with the determination of an optimum combination between the examined parameters, so that probable undesirable effects on engine performance characteristics are avoided. By comparing the investigation results, it is revealed that the simultaneous increase of both parameters examined could be a promising solution to improving engine efficiency (increase up to 5%) and reducing CO emissions (decrease up to 10%) from a pilot ignited dual fuel diesel engine, without imparting any serious problem to engine operational lifetime. The conclusions from the study may be proved valuable for the application of this technological solution to existing diesel engines. © 2013 Published by Elsevier Ltd.

Papagiannakis R.G.,Hellenic Military Academy | Zannis T.C.,Hellenic Naval Academy
International Journal of Hydrogen Energy | Year: 2013

Awareness of limitations of petroleum based liquid fuels as for example used in spark-ignited heavy-duty engines for power generation, has led engineers to propose various solutions such as the use of alternative/renewable energy sources. Wood-gas is an alternative gaseous fuel generated from the gasification of wood, which could be used as a full supplement fuel in conventional heavy-duty spark-ignited engines fuelled with natural gas. Previous related research studies have shown that the main disadvantage of the wood-gas combustion is its negative impact on brake engine efficiency compared to the normal natural gas operation, while NO and CO emissions are also increased. Compression ratio and spark timing are some of the engine parameters, which influence significantly the combustion mechanism inside the combustion chamber of a wood-gas powered spark-ignited engine. In order to examine the effect of these parameters on the performance and exhaust emissions of a heavy-duty, turbocharged, spark-ignited engine fuelled with wood-gas, a theoretical investigation is conducted in this work by using a numerical simulation. The results concern engine performance characteristics, NO and CO emissions for various engine operating conditions (i.e. air to fuel excess ratios), by using a comprehensive two-zone phenomenological model. The predictive ability of the thermodynamic model was tested against experimental measurements, which were obtained from the operation of a multi-cylinder, four-stroke, turbocharged, spark-ignited engine fuelled with wood-gas fuel at various loads. The experimental results are found to be in good agreement with the respective computed ones obtained from the simulation model. The main objective of the comparative assessment shown in the present work is to record and comparatively evaluate the relative impact of each one of the above mentioned parameters (compression ratio and spark timing) on the engine performance characteristics and emitted pollutants. Furthermore, an effort is made to determine the optimum combinations between these parameters, since at high engine load conditions their simultaneous increase may lead in undesirable results concerning the engine performance characteristics. The conclusions from the present investigation are valuable for the use of wood-gas as a full supplement energy source in conventional, natural gas fuelled, heavy-duty, spark-ignited engines used for electric power generation. Copyright © 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

Lazopoulos A.K.,Hellenic Military Academy
International Journal of Mechanical Sciences | Year: 2012

The governing equation of motion of thin flexural beams is studied in the context of strain gradient elasticity. Simple linear strain gradient elastic theory with surface energy is employed. The governing beam equations with its boundary conditions are derived through a variational method. It turns out that new terms are introduced, indicating the importance of the cross-section area in bending of thin beams. Those terms are due to couple stresses, and are missing from the existing strain gradient beam theories and increase highly the stiffness of the thin beam. With the full term equation of motion we will study the flexural wave propagation and free flexural vibrations of the beam. Moreover free vibrations of gradient elastic beams are also analyzed and natural frequencies and modal shapes are obtained. Furthermore, the problem of the dynamic stability of a cantilever beam compressed by a follower force (Beck's problem) is considered. Finally there is a discussion for the results especially comparing existing theories with the present one. © 2012 Elsevier Ltd. All rights reserved.

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