Ioannis Konstantinidis

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It is becoming increasingly important to be able to credential and identify authorized personnel at key points of entry. Such identity management systems commonly employ biometric identifiers. In this paper, we present a novel multimodal facial recognition approach that employs data from both visible spectrum and thermal infrared sensors. Data from multiple(More)
We present a general mathematical theory for lifting frames that allows us to modify existing filters to construct new ones that form Parseval frames. We apply our theory to design nonseparable Parseval frames from separable (tensor) products of a piecewise linear spline tight frame. These new frame systems incorporate the weighted average operator, the(More)
Constant amplitude zero autocorrelation (off the dc component) waveforms are constructed. These are called CAZAC waveforms. In the d-dimensional case they consist of N vectors , where N is given, and N is generally greater than d. The constructions are algebraic and have been implemented in user friendly software. They have the added feature that they are a(More)
  • Giannis Mountzios, Ioannis Kostopoulos, Vassiliki Kotoula, Ioanna Sfakianaki, Elena Fountzilas, Konstantinos Markou +7 others
  • 2013
INTRODUCTION Prognosis of patients with operable laryngeal cancer is highly variable and therefore potent prognostic biomarkers are warranted. The insulin-like growth factor receptor (IGFR) signaling pathway plays a critical role in laryngeal carcinogenesis and progression. PATIENTS AND METHODS We identified all patients with localized TNM stage I-III(More)
  • Serge Evrard, Graeme Poston, Peter Kissmeyer-Nielsen, Abou Diallo, Grégoire Desolneux, Véronique Brouste +12 others
  • 2014
BACKGROUND Combined intra-operative ablation and resection (CARe) is proposed to treat extensive colorectal liver metastases (CLM). This multicenter study was conducted to evaluate overall survival (OS), local recurrence-free survival (LRFS), hepatic recurrence-free survival (HRFS) and progression-free survival (PFS), to identify factors associated with(More)
— In this paper, we present a novel frames-based denoising algorithm. Using a general result on lifting frames, we construct a non-separable 3D frame capable of robust edge detection. This frame detects edge information by ensemble thresholding of the filtered data. The denoising uses a hysteresis thresholding step and an affine thresholding function, which(More)
  • Rhanderson N Cardoso, Alexandre M Benjo, James J DiNicolantonio, Daniel C Garcia, Francisco Y B Macedo, Georges El-Hayek +5 others
  • 2015
BACKGROUND Dual antiplatelet therapy is the standard of care after coronary stent placement but increases the bleeding risk. The effects of proton pump inhibitors (PPIs) on clopidogrel metabolism have been described, but the clinical significance is not yet definitive. We aimed to do an updated meta-analysis comparing outcomes in patients receiving(More)
BACKGROUND The utilization of parathyroidectomy (PTX) to manage secondary hyperparathyroidism (SHPT) refractory to medical management (MTX) in end-stage renal disease (ESRD) in the era of calcimimetics is not well known. METHODS Adult ESRD patients receiving dialysis between August 2007 and December 2011 at our institution with an intact parathyroid(More)