• Conference Object  

      Analysis and passive control of a four-bar linkage for the rehabilitation of upper-limb motion 

      Xydas, E. G.; Louca, Loucas S.; Mueller, A. (American Society of Mechanical Engineers, 2015)
      In the last two decades robotic rehabilitation research provided significant insight regarding the human-robot interaction, helped understand the process by which the impaired nervous system is retrained to better control ...
    • Article  

      Assignment of natural frequencies by an added mass and one or more springs 

      Kyprianou, Andreas; Mottershead, J. E.; Ouyang, H. (2004)
      The problem of assigning natural frequencies to a multi-degree-of-freedom undamped system by an added mass connected by one or more springs is addressed. The added mass and stiffnesses are determined using receptances from ...
    • Article  

      Carrier dynamics in InS nanowires grown via chemical vapor deposition 

      Othonos, A.; Zervos, Matthew (2010)
      Transient femtosecond absorption spectroscopy and timecorrelating single photon counting (TCSPC) photoluminescence (PL) were employed to study InS nanowires (NWs) grown by chemical vapor deposition (CVD) and determine the ...
    • Article  

      Carrier dynamics in Β-Ga2O3 nanowires 

      Othonos, A.; Zervos, Matthew; Christofides, C. (2010)
      Carrier dynamics have been investigated in Β-Ga2O 3 nanowires (NWs) grown by the vapor-liquid-solid mechanism, using ultrashort transient absorption spectroscopy in conjunction with time-correlating single photon counting ...
    • Conference Object  

      Fault-tolerant linear finite state machines 

      Hadjicostis, Christoforos N.; Verghese, G. C. (Institute of Electrical and Electronics Engineers Inc., 1999)
      In this paper we develop a framework for constructing fault-tolerant dynamic systems, focusing primarily on linear finite state machines (LFSMs). Modular redundancy, the traditional approach to fault tolerance, is expensive ...
    • Article  

      Femtosecond carrier dynamics in In 2O 3 nanocrystals 

      Othonos, A.; Zervos, Matthew; Tsokkou, D. (2009)
      We have studied carrier dynamics in In 2O 3 nanocrystals grown on a quartz substrate using chemical vapor deposition. Transient differential absorption measurements have been employed to investigate the relaxation dynamics ...
    • Article  

      Frequency domain and dynamic game methods for actuator/sensor selection in systems with sector nonlinearities 

      Demetriou, M. A.; Charalambous, Charalambos D. (2001)
      The purpose of this note is to provide a method for placing actuators and sensors in systems with nonlinear dynamics wherein the choices for actuator and sensor locations are such that the resulting system is rendered ...
    • Conference Object  

      A model accuracy and validation algorithm 

      Sendur, P.; Stein, J. L.; Peng, H.; Louca, Loucas S. (American Society of Mechanical Engineers (ASME), 2002)
      Dynamic models of physical systems with physically meaningful states and parameters have become increasingly important, for design, control and even procurement decisions. The successful use of models in these contexts ...
    • Article  

      Molecular dynamic simulations of carbon nanotubes in CO2 atmosphere 

      Alexiadis, A.; Kassinos, Stavros C. (2008)
      This work investigates by means of molecular dynamics the filling of carbon nanotubes by carbon dioxide molecules. Nanotubes of various sizes are simulated and the resulting CO2 density calculated. The effects of various ...
    • Article  

      Molecular simulation of water in carbon nanotubes 

      Alexiadis, A.; Kassinos, Stavros C. (2008)
      The motion of water in carbon nanotubes (CNT) by numerical procedures is calculated through molecular dynamics (MD) simulation studies. The Lennard-Jones potential is a simple MD simulations technique, which combines ...
    • Conference Object  

      Non-uniform finite segment representation and reduction of a cantilever beam model 

      Louca, Loucas S. (Dime University of Genoa, 2016)
      The cantilever beam is a component widely used in numerous engineering systems with its geometric and material properties varying depending on the application. Calculating the dynamic behavior of a cantilever beam is a ...
    • Conference Object  

      NUMERICAL ANALYSIS OF ANCIENT MULTI-DRUM COLUMNS WITH EPISTYLES UNDER DYNAMIC LOADINGS 

      Papaloizou, Loizos; Polycarpou, Panayiotis; Komodromos, Petros I. (International Association for Earthquake Engineering, 2008)
      In this research work, the Discrete Element Methods (DEM) is utilized to investigate the response of ancient multi-drum columns during harmonic and earthquake excitations by simulating the individual rock blocks as distinct ...
    • Article  

      On poundings of a seismically isolated building with adjacent structures during strong earthquakes 

      Polycarpou, Panayiotis C.; Komodromos, Petros I. (2010)
      This paper presents selected indicative results from an extensive parametric investigation that has been performed in order to assess the effects of potential earthquake-induced poundings on the overall dynamic response ...
    • Conference Object  

      Remarks on the explicit solutions for nonlinear partially observable stochastic control problems and relations to H∞ or robust control 

      Charalambous, Charalambos D.; Elliott, Robert J. (IEEE, 1995)
      Partially observable stochastic and H∞ control problems are considered. The dynamics include nonlinearities which are the gradient of some potential function in addition to linear terms, the observations are linear, and ...
    • Article  

      Self-diffusivity, hydrogen bonding and density of different water models in carbon nanotubes 

      Alexiadis, A.; Kassinos, Stavros C. (2008)
      In this paper, the density, hydrogen bonding and self-diffusivity of water confined in carbon nanotubes are investigated. Molecular dynamics is used to simulate a large variety of nanotubes with various water models. Our ...
    • Conference Object  

      Stochastic optimal control subject to ambiguity 

      Charalambous, Charalambos D.; Tzortzis, I.; Rezaei, F. (2011)
      The aim of this paper is to address optimality of control strategies for stochastic control systems subject to uncertainty and ambiguity. Uncertainty corresponds to the case when the true dynamics and the nominal dynamics ...
    • Article  

      Systematic assessment of rigid internal combustion engine dynamic coupling 

      Rideout, D. G.; Stein, J. L.; Louca, Loucas S. (2008)
      Accurate estimation of engine vibrations is essential in the design of new engines, engine mounts, and the vehicle frames to which they are attached. Mount force prediction has traditionally been simplified by assuming ...
    • Article  

      Tin oxide nanowires: The influence of trap states on ultrafast carrier relaxation 

      Othonos, A.; Zervos, Matthew; Tsokkou, D. (2009)
      We have studied the optical properties and carrier dynamics in SnO 2 nanowires (NWs) with an average radius of 50 nm that were grown via the vapor-liquid solid method. Transient differential absorption measurements have ...
    • Article  

      Ultrafast carrier relaxation in inn nanowires grown by reactive vapor transport 

      Othonos, A.; Zervos, Matthew; Pervolaraki, M. (2009)
      We have studied femtosecond carrier dynamics in InN nanowires grown by reactive vapor transport. Transient differential absorption measurements have been employed to investigate the relaxation dynamics of photogenerated ...
    • Article  

      Ultrafast hole carrier relaxation dynamics in p-type CuO nanowires 

      Othonos, A.; Zervos, Matthew (2011)
      Ultrafast hole carrier relaxation dynamics in CuO nanowires have been investigated using transient absorption spectroscopy. Following femtosecond pulse excitation in a non-collinear pump-probe configuration, a combination ...