An algorithm for density enrichment of sparse collaborative filtering datasets using robust predictions as derived ratings

D Margaris, D Spiliotopoulos, G Karagiorgos… - Algorithms, 2020 - mdpi.com
Collaborative filtering algorithms formulate personalized recommendations for a user, first by
analysing already entered ratings to identify other users with similar tastes to the user …

Exploiting Rating Prediction Certainty for Recommendation Formulation in Collaborative Filtering

D Margaris, K Sgardelis, D Spiliotopoulos… - Big Data and Cognitive …, 2024 - mdpi.com
Collaborative filtering is a popular recommender system (RecSys) method that produces
rating prediction values for products by combining the ratings that close users have already …

Improving collaborative filtering's rating prediction accuracy by introducing the experiencing period criterion

D Margaris, D Spiliotopoulos, C Vassilakis… - Neural Computing and …, 2023 - Springer
Collaborative filtering algorithms take into account users' tastes and interests, expressed as
ratings, in order to formulate personalized recommendations. These algorithms initially …

[PDF][PDF] Collaborative Filtering Recommender System pada Virtual 3D Kelas Cendekia

AS Wardana, MIA Timur - IJEIS (Indonesian Journal of Electronics and …, 2018 - core.ac.uk
Kelas Cendekia merupakan suatu konsep proses pembelajaran modern dimana pengguna
dapat melakukan proses pembelajaran secara kolaboratif dimanapun dan kapanpun …

Improving collaborative filtering's rating prediction coverage in sparse datasets through the introduction of virtual near neighbors

D Margaris, D Vasilopoulos… - 2019 10th …, 2019 - ieeexplore.ieee.org
Collaborative filtering creates personalized recommendations by considering ratings
entered by users. Collaborative filtering algorithms initially detect users whose likings are …

Improving collaborative filtering's rating prediction accuracy by introducing the common item rating past criterion

D Margaris, D Vasilopoulos… - 2019 10th …, 2019 - ieeexplore.ieee.org
Collaborative filtering formulates personalized recommendations by considering ratings
submitted by users. Collaborative filtering algorithms initially find people having similar …

A mixed-reality interaction-driven game-based learning framework

D Spiliotopoulos, D Margaris, C Vassilakis… - Proceedings of the 11th …, 2019 - dl.acm.org
In the modern information society, learning is no longer just about obtaining factual
knowledge, but more about general skills on how and where to apply available knowledge …

Policy making analysis and practitioner user experience

D Koryzis, F Fitsilis, D Spiliotopoulos… - HCI International 2020 …, 2020 - Springer
This article presents the work on social media analysis-driven policy-making platforms that
are powered by classic social media analysis technologies, such as policy modelling …

Semantics-driven conversational interfaces for museum chatbots

D Spiliotopoulos, K Kotis, C Vassilakis… - … Conference on Human …, 2020 - Springer
This work addresses the challenges of creating usable and personalized conversational
interfaces for broad, yet applicable, domains that require user engagement and learning …

A user interface for personalising WS-BPEL scenarios

D Margaris, D Spiliotopoulos, D Vasilopoulos… - … Conference on Human …, 2021 - Springer
Due to the huge volume of web services available, both locally and in the cloud, the
performance of users and systems need significant research attention. Since WS-BPEL is …