• Conference Object  

      ACCES: Offline accuracy estimation for fingerprint-based localization 

      Nikitin, A.; Laoudias, Christos; Chatzimilioudis, Georgios; Karras, P.; Zeinalipour-Yazdi, Constantinos D. (Institute of Electrical and Electronics Engineers Inc., 2017)
      In this demonstration we present ACCES, a novel framework that enables quality assessment of arbitrary fingerprint maps and offline accuracy estimation for the task of fingerprint-based indoor localization. Our framework ...
    • Conference Object  

      Action functional stochastic H∞ estimation for nonlinear discrete time systems 

      Charalambous, Charalambos D.; Farhadi, A.; Djouadi, S. M. (2002)
      This paper presents an action functional, sample path optimization technique, for formulating and solving nonlinear discrete-time stochastic H∞ estimation problems. These H∞ problems are formulated as minimax dynamic games ...
    • Article  

      Adaptive mixing control with multiple estimators 

      Baldi, S.; Ioannou, Petros A.; Kosmatopoulos, E. B. (2012)
      A recently proposed adaptive control scheme with mixing involves the use of precalculated candidate controllers whose output is weighted on the basis of the parameter estimates generated by an online parameter estimator. ...
    • Article  

      Aggregation of spectral density estimators 

      Chang, Christopher C.; Politis, Dimitris Nicolas (2014)
      Given stationary time series data, we study the problem of finding the best linear combination of a set of lag window spectral density estimators with respect to the mean squared risk. We present an aggregation procedure ...
    • Conference Object  

      An AM-FM model for motion estimation in atherosclerotic plaque videos 

      Murray, V.; Murillo, S. E.; Pattichis, Marios S.; Loizou, Christos P.; Pattichis, Constantinos S.; Kyriacou, Efthyvoulos C.; Nicolaïdes, Andrew N. (2007)
      We present new multidimensional Amplitude-Modulation Frequency-Modulation (AM-FM) methods for motion estimation. For a single AM-FM component we show that the optical flow constraint leads to separate equations for amplitude ...
    • Conference Object  

      An analytical framework for estimating TCO and exploring data center design space 

      Hardy, D.; Kleanthous, Marios M.; Sideris, I.; Saidi, A. G.; Ozer, E.; Sazeides, Yiannakis (2013)
      In this paper, we present EETCO: an estimation and exploration tool that provides qualitative assessment of data center design decisions on Total-Cost-of-Ownership (TCO) and environmental impact. It can capture the ...
    • Conference Object  

      Atherosclerotic plaque motion analysis from ultrasound videos 

      Murillo, S. E.; Pattichis, Marios S.; Loizou, Christos P.; Pattichis, Constantinos S.; Kyriacou, Efthyvoulos C.; Constantinides, Anthony G.; Nicolaïdes, Andrew N. (2006)
      In this paper, we describe a collection of algorithms that are used to provide motion trajectory estimates from atherosclerotic plaque ultrasound videos. Our approach is based on the use of four different optical flow ...
    • Article  

      Bounds on the number of markings consistent with label observations in petri nets 

      Ru, Y.; Hadjicostis, Christoforos N. (2009)
      In this paper, we consider state estimation in discrete-event systems (DESs) modeled by labeled Petri nets and present upper bounds on the number of system states (or markings) that are consistent with an observed sequence ...
    • Article  

      Complex-valued tapers 

      Politis, Dimitris Nicolas (2005)
      The spectral estimation method based on the average of short, tapered periodograms is re-examined. The bias of such estimators is typically O(1/b2), where b is the length of the short blocks. Much of the current researeh ...
    • Conference Object  

      Convergence of belief propagation algorithms on binary pairwise Gibbs random fields 

      Le, T.; Hadjicostis, Christoforos N. (2011)
      In this paper, we study the convergence of belief propagation algorithms (BPAs) on binary pairwise Gibbs random fields (BP-GRFs). Exploiting the equivalence of BPA on the graph associated with BP-GRF and the corresponding ...
    • Conference Object  

      Demo: Indoor geolocation on multi-sensor smartphones 

      Li, C. -L; Laoudias, Christos; Larkou, G.; Tsai, Y. -K; Zeinalipour-Yazdi, Constantinos D.; Panayiotou, Christos G. (2013)
      In this demo, we present an efficient hybrid indoor positioning solution that uses multi-sensory location-oriented observations, including WiFi, accelerometer, gyroscope and digital compass data, that are widely available ...
    • Article  

      Discrete-time risk-sensitive filters with on-Gaussian initial conditions and their ergodic properties 

      Dey, S.; Charalambous, Charalambos D. (2001)
      We study asymptotic stability properties of risk-sensitive filters with respect to their initial conditions. We consider a linear time-invariant systems with initial conditions that are not necessarily Gaussian. We show ...
    • Conference Object  

      Distributed network size estimation and average degree estimation and control in networks isomorphic to directed graphs 

      Shames, I.; Charalambous, T.; Hadjicostis, Christoforos N.; Johansson, M. (2012)
      Many properties of interest in graph structures are based on the nodes' average degree (i.e., the average number of edges incident to/from each node). In this work, we present asynchronous distributed algorithms, based on ...
    • Article  

      Dynamic misspecification in nonparametric cointegrating regression 

      Kasparis, Ioannis; Phillips, Peter C. B. (2012)
      Linear cointegration is known to have the important property of invariance under temporal translation. The same property is shown not to apply for nonlinear cointegration. The limit properties of the Nadaraya-Watson (NW) ...
    • Conference Object  

      Estimation and identification of time-varying long-term fading channels via the particle filter and the em algorithm 

      Ma, X.; Olama, M. M.; Djouadi, S. M.; Charalambous, Charalambos D. (2011)
      In this paper, we are concerned with the estimation and identification of time-varying wireless longterm fading channels. The dynamics of the fading channels are captured using a mean-reverting linear stochastic differential ...
    • Article  

      Estimation and inference in functional mixed-effects models 

      Antoniadis, Anestis; Sapatinas, Theofanis (2007)
      Functional mixed-effects models are very useful in analyzing functional data. A general functional mixed-effects model that inherits the flexibility of linear mixed-effects models in handling complex designs and correlation ...
    • Article  

      Estimation of rotational frequency responses 

      Mottershead, J. E.; Kyprianou, Andreas; Ouyang, H. (2003)
      Rotational frequency response functions are potentially valuable for structural damage detection but are difficult to obtain because of the practical problems of applying a pure moment. In the literature various indirect ...
    • Conference Object  

      Feedback control over packet dropping network links 

      Mo, H.; Hadjicostis, Christoforos N. (2007)
      This paper studies stabilization schemes for a discrete-time control systems in which the feedback loop includes a network link that may suffer packet drops. We model the packet dropping network link as an erasure channel ...
    • Article  

      Generating proper dynamic models for truck mobility and handling 

      Louca, Loucas S.; Rideout, D. G.; Stein, J. L.; Hulbert, G. M. (2004)
      The effectiveness and utility of an energy-based model reduction algorithm for two different vehicle system modeling applications are discussed. The first case study focuses on the vehicle dynamics model of a military ...
    • Article  

      Identification and high bandwidth control of hard disk drive servo systems based on sampled data measurements 

      Ioannou, Petros A.; Xu, H.; Fidan, B. (2007)
      One of the key factors that determines the track density of a hard disk drive (HDD) is the performance characteristics of the HDD servo system, the control system that positions the READ/WRITE magnetic head close to the ...