Browsing by Author "Panayiotou, Christos"
Now showing items 1-20 of 21
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Active Fault Diagnosis via Reachable Set Separation using Interval Methods
Tsiakkas, Mihalis; Sopasakis, Pantelis; Boem, Francesca; Panayiotou, Christos; Polycarpou, Marios (2019)This paper presents an optimization-based approach for active fault isolation in linear time invariant systems subject to additive disturbances which are bounded in intervals. We model the evolution of the system states ...
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Adaptive multi-model monitoring of recurrent mobility patterns
Papachristoforou, L.; Kolios, P.; Panayiotou, Christos; Ellinas, Georgios (2019)Multi-model event-triggering is a highly promising technique for efficient monitoring of processes where instead of continuous or even periodic triggering of events, communication and control is only applied after some ...
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Article
Beaconing-based Networking for Localized Information Exchange in Emergency Management
Kolios, Panayiotis; Koumidis, Konstandinos; Panayiotou, Christos; Ellinas, Georgios (2020)Currently, numerous proprietary communication technologies are used by emergency response personnel to ensure uninterrupted coordination and effective situational awareness, especially when the telecommunication infrastructure ...
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Charging Policies for PHEVs used for Service Delivery: A Reinforcement Learning Approach
Panayiotou, Tania; Chatzis, Sotirios P.; Panayiotou, Christos; Ellinas, Georgios (2018)This work examines a cost optimization problem for plug-in hybrid electric vehicles (PHEVs) used for service delivery, in the presence of energy consumption uncertainty. For the cost optimization problem, an optimal policy ...
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Consensus Approach to Secure State Estimation for a Class of Remotely Sensed Networked Systems
Tsiakkas, Mihalis; Nicolaou, Nicolas; Polycarpou, Marios; Panayiotou, Christos (2018)Remote sensing is often a crucial part of cyber-physical and networked systems. Measurements taken at remote locations can both serve as monitoring tools as well as to inform control decisions. Over the past few years, a ...
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Controlled islanding of power systems considering voltage stability constraints
Demetriou, P.; Kyriacou, A.; Kyriakides, Elias; Panayiotou, Christos (Institution of Engineering and Technology, 2018)An Intentional Controlled Islanding (ICI) algorithm that directly determines an islanding solution with minimal power-flow disruption for any given number of islands, while ensuring that each island contains only coherent ...
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Article
Controlled Islanding Solution for Large-Scale Power Systems
Kyriacou, Alexis; Demetriou, Panayiotis; Panayiotou, Christos; Kyriakides, Elias (2018)Intentional Controlled Islanding (ICI) has been proposed as a corrective measure of last resort to split the power system into several sustainable islands and prevent cascading outages. This paper proposes a novel ICI ...
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Article
Drones: Augmenting Our Quality of Life
Kyrkou, Christos; Timotheou, Stelios; Kolios, Panayiotis; Theocharides, Theocharis; Panayiotou, Christos (2019)Drone technology that has the potential to disrupt and augment our quality of life is swiftly evolving. Drones are rapidly growing in popularity and are used in various applications, such as agriculture, emergency response, ...
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Establishing Data Integrity in Networks of Cyber-Physical Systems
Tsiakkas, Mihalis; Kolios, Panayiotis; Polycarpou, Marios; Panayiotou, Christos (2018)Cyber-physical systems are pervasive in today's society with applications ranging from critical infrastructure systems such as the power grid or water distribution network to industrial control systems. It is clear that ...
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An Event-triggering Approach for Bus Tracking based on Multimodel Mobility Prediction
Michalopoulou, M.; Kolios, P.; Panayiotou, Christos; Ellinas, Georgios (2019)Tracking a fleet of buses that serve routes across a city is an essential functionality for the successful utilization of modern transportation networks. However, to date, little attention has been paid to the effectiveness ...
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Intentional Controlled Islanding of Power Systems Equipped With Battery Energy Storage Systems
Demetriou, Panayiotis; Kyriacou, Alexis; Kyriakides, Elias; Panayiotou, Christos (2019)Grid-scale Battery Energy Storage Systems (BESSs) are gaining increasing consideration over the last few years since their connection has been shown to improve the dynamic behavior of the power grid. However, existing ...
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Islanding and Resynchronization Procedure of a University Campus Microgrid
Zacharia, L.; Kyriakou, A.; Hadjidemetriou, L.; Kyriakides, Elias; Panayiotou, Christos; Martensen, N.; Borg, N. (2018)During the last decade, microgrids are attracting a significant attention due to their numerous advantages. Amongst them, the most important one is their ability to operate either in grid-connected or in islanded (autonomous) ...
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Optimization Based Partitioning Selection for Improved Contaminant Detection Performance
Kyriacou, Alexis; Timotheou, Stelios; Reppa, Vasso; Boem, Francesca; Panayiotou, Christos; Polycarpou, Marios; Parisini, Thomas (2018)Indoor Air Quality monitoring is an essential ingredient of intelligent buildings. The release of various airborne contaminants into the buildings, compromises the health and safety of occupants. Therefore, early contaminant ...
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Optimization-based Highway Traffic State Estimation with Bound Guarantees
Timotheou, Stelios; Panayiotou, Christos; Polycarpou, Marios (2018)Uncertainty about the system behaviour and the sensor measurements hinders reliable traffic state estimation, affecting various transportation operations, especially traffic control and incident detection. This work proposes ...
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Article
Optimizing the Detection Performance of Smart Camera Networks Through a Probabilistic Image-Based Model
Kyrkou, Christos; Christoforou, Eftychios G.; Timotheou, Stelios; Theocharides, Theocharis; Panayiotou, Christos; Polycarpou, Marios (2018)Networks of smart cameras, equipped with on-board processing and communication infrastructure, are increasingly being deployed in a variety of different application fields, such as security and surveillance, traffic ...
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Article
Optimizing the Detection Performance of Smart Camera Networks Through a Probabilistic Image-Based Model
Kyrkou, Christos; Christoforou, Eftychios G.; Timotheou, Stelios; Theocharides, Theocharis; Panayiotou, Christos; Polycarpou, Marios (2018)Networks of smart cameras, equipped with on-board processing and communication infrastructure, are increasingly being deployed in a variety of different application fields, such as security and surveillance, traffic ...
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Article
Performance Index for Optimizing Sensor Fault Detection of a Class of Nonlinear Systems
Reppa, Vasso; Timotheou, Stelios; Polycarpou, Marios M.; Panayiotou, Christos (2018)This paper develops a performance index that can be used to find the optimal design parameters of the observer-based residual generator and adaptive threshold of a fault detection scheme for a class of nonlinear systems. ...
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Queue-Based Resampling for Online Class Imbalance Learning
Malialis, Kleanthis; Panayiotou, Christos; Polycarpou, Marios M. (Springer International Publishing, 2018)Online class imbalance learning constitutes a new problem and an emerging research topic that focusses on the challenges of online learning under class imbalance and concept drift. Class imbalance deals with data streams ...
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Reducing Vulnerability to Cyber-Physical Attacks in Water Distribution Networks
Nicolaou, Nicolas; Eliades, Demetrios G.; Panayiotou, Christos; Polycarpou, Marios M. (2018)Cyber-Physical Systems (CPS), such as Water Distribution Networks (WDNs), deploy digital devices to monitor and control the behavior of physical processes. These digital devices, however, are susceptible to cyber and ...
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SWIFTERS: A Multi-UAV Platform for Disaster Management
Terzi, Maria; Anastasiou, Antreas; Kolios, Panayiotis; Panayiotou, Christos; Theocharides, Theocharis (2019)In this paper we present SWIFTERS, a technology platform for utilising multiple UAVs in disaster management. The platform aims to provide fast situational awareness and improve the effectiveness of disaster management ...