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George Kopsiaftis

National Technical University of Athens
Подтвержден адрес электронной почты в домене central.ntua.gr
Цитируется: 983

Multi-class confusion matrix reduction method and its application on net promoter score classification problem

I Markoulidakis, G Kopsiaftis, I Rallis… - Proceedings of the 14th …, 2021 - dl.acm.org
The paper presents a novel method for reducing a multi-class Confusion Matrix into a 2 × 2
version enabling the use of the relevant performance metrics and methods like the Receiver …

Gaussian process regression tuned by bayesian optimization for seawater intrusion prediction

G Kopsiaftis, E Protopapadakis… - Computational …, 2019 - Wiley Online Library
Accurate prediction of the seawater intrusion extent is necessary for many applications,
such as groundwater management or protection of coastal aquifers from water quality …

Vehicle detection and traffic density monitoring from very high resolution satellite video data

G Kopsiaftis, K Karantzalos - 2015 IEEE international …, 2015 - ieeexplore.ieee.org
In this paper an automated vehicle detection and traffic density estimation algorithm has
been developed and validated for very high resolution satellite video data. The algorithm is …

Methodology for holistic assessment of grey-green flood mitigation measures for climate change adaptation in urban basins

IM Kourtis, V Bellos, G Kopsiaftis, B Psiloglou… - Journal of …, 2021 - Elsevier
A novel methodological framework for urban drainage adaptation to climate change is
introduced and tested in a small urban basin. The impact of climate change on Intensity-Duration-…

Performance comparison of physics-based and machine learning assisted multi-fidelity methods for the management of coastal aquifer systems

G Kopsiaftis, M Kaselimi, E Protopapadakis… - Frontiers in …, 2023 - frontiersin.org
In this work we investigate the performance of various lower-fidelity models of seawater
intrusion in coastal aquifer management problems. The variable density model is considered as …

Propagating dam breach parametric uncertainty in a river reach using the HEC-RAS software

V Bellos, VK Tsakiris, G Kopsiaftis, G Tsakiris - Hydrology, 2020 - mdpi.com
Dam break studies consist of two submodels: (a) the dam breach submodel which derives
the flood hydrograph and (b) the hydrodynamic submodel which, using the flood hydrograph, …

[HTML][HTML] An adaptive multi-fidelity optimization framework based on co-Kriging surrogate models and stochastic sampling with application to coastal aquifer …

V Christelis, G Kopsiaftis, RG Regis… - Advances in Water …, 2023 - Elsevier
Surrogate modelling has been used successfully to alleviate the computational burden that
results from high-fidelity numerical models of seawater intrusion in simulation-optimization …

Performance comparison of multiple and single surrogate models for pumping optimization of coastal aquifers

V Christelis, G Kopsiaftis… - Hydrological Sciences …, 2019 - Taylor & Francis
Single and multiple surrogate models were compared for single-objective pumping optimization
problems of a hypothetical and a real-world coastal aquifer. Different instances of radial …

Assessment of drought impacts on semi-arid coastal aquifers of the Mediterranean

G Kopsiaftis, D Tigkas, V Christelis… - Journal of Arid …, 2017 - Elsevier
Long-term impacts of drought, such as groundwater decline, can emerge during a persisting
drought. Though not easily visible, they are severe and harder to cope with. Groundwater is …

A machine learning based classification method for customer experience survey analysis

I Markoulidakis, I Rallis, I Georgoulas, G Kopsiaftis… - Technologies, 2020 - mdpi.com
Customer Experience (CX) is monitored through market research surveys, based on metrics
like the Net Promoter Score (NPS) and the customer satisfaction for certain experience …