Kostas N. Koutrakis

Mr. Kostas N. Koutrakis

orcid

Research Focus & Metrics

Academic Career Length

5Years (2022-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

View All Publications
1 February 2024 in Sensors
Verified
Journal Article
Open access
PDF file
Panos I. PhilippopoulosPanos I. Philippopoulos
Panos I. Philippopoulos
Ioannis DrivasIoannis Drivas
Ioannis Drivas
Nikolaos TselikasNikolaos Tselikas
Nikolaos Tselikas
KKKostas N. Koutrakis
Kostas N. Koutrakis
EMElena Melidi
Elena Melidi
DKDimitrios Kouis
Dimitrios Kouis
Managing modern museum content and visitor data analytics to achieve higher levels of visitor experience and overall museum performance is a complex and multidimensional issue involving several scientific aspects, such as exhibits’ metadata management, visitor movement tracking and modelling, location/context-aware content provision, etc. In related prior research, most of the efforts have focused individually on some of these aspects and do not provide holistic approaches enhancing both museum performance and visitor experience. This paper proposes an integrated conceptualisation for improving these two aspects, involving four technological components. First, the adoption and parameterisation of four ontologies for the digital documentation and presentation of exhibits and their conservation methods, spatial management, and evaluation. Second, a tool for capturing visitor movement in near real-time, both anonymously (default) and eponymously (upon visitor consent). Third, a mobile application delivers personalised content to eponymous visitors based on static (e.g., demographic) and dynamic (e.g., visitor movement) data. Lastly, a platform assists museum administrators in managing visitor statistics and evaluating exhibits, collections, and routes based on visitors’ behaviour and interactions. Preliminary results from a pilot implementation of this holistic approach in a multi-space high-traffic museum (MELTOPENLAB project) indicate that a cost-efficient, fully functional solution is feasible, and achieving an optimal trade-off between technical performance and cost efficiency is possible for museum administrators seeking unfragmented approaches that add value to their cultural heritage organisations.

25 April 2025 in Sensors
Verified
Journal Article
Open access
PDF file
Panos I. PhilippopoulosPanos I. Philippopoulos
Panos I. Philippopoulos
KKKostas N. Koutrakis
Kostas N. Koutrakis
ETEfstathios D. Tsafaras
Efstathios D. Tsafaras
EPEvangelia G. Papadopoulou
Evangelia G. Papadopoulou
Dimitrios SigalasDimitrios Sigalas
Dimitrios Sigalas
Costas VassilakisCostas Vassilakis
Costas Vassilakis
RSSI-based proximity positioning is a well-established technique for indoor localization, featuring simplicity and cost-effectiveness, requiring low-price and off-the-shelf hardware. However, it suffers from low accuracy (in NLOS traffic), noise, and multipath fading issues. In large complex spaces, such as museums, where heavy visitor traffic is expected to seriously impact the ability to maintain LOS, RSSI coupled with Bluetooth Low Energy (BLE) seems ideal in terms of market availability, cost-/energy-efficiency and scalability that affect competing technologies, provided it achieves adequate accuracy. Our work reports and discusses findings of a BLE/RSSI-based pilot, implemented at the Museum of Modern Greek Culture in Athens, involving eight buildings with 47 halls with diverse areas, shapes, and showcase layouts. Wearable visitor BLE beacons provided cell-level location determined by a prototype tool (VTT), integrating in its architecture different functionalities: raw RSSI data smoothing with Kalman filters, hybrid positioning provision, temporal methods for visitor cell prediction, spatial filtering, and prediction based on popular machine learning classifiers. Visitor movement modeling, based on critical parameters influencing signal measurements, provided scenarios mapped to popular behavioral models. One such model, “ant”, corresponding to relatively slow nomadic cell roaming, was selected for basic experimentation. Pilot implementation decisions and methods adopted at all layers of the VTT architecture followed the overall concept of simplicity, availability, and cost-efficiency, providing a maximum infrastructure cost of 8 Euro per m2 covered. A total 15 methods/algorithms were evaluated against prediction accuracy across 20 RSSI datasets, incorporating diverse hall cell allocations and visitor movement patterns. RSSI data, temporal and spatial management with simple low-processing methods adopted, achieved a maximum prediction accuracy average of 81.53% across all datasets, while ML algorithms (Random Forest) achieved a maximum prediction accuracy average of 87.24%.

25 November 2022
Verified
Book Chapter
Closed access
PDF file
Dimitris SpiliotopoulosDimitris Spiliotopoulos
Dimitris Spiliotopoulos
Dionisis MargarisDionisis Margaris
Dionisis Margaris
KKKostas N. Koutrakis
Kostas N. Koutrakis
Panos I. PhilippopoulosPanos I. Philippopoulos
Panos I. Philippopoulos
Costas VassilakisCostas Vassilakis
Costas Vassilakis