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Professor Kostas Nikolopoulos' Outputs (4)

Forecasting: theory and practice (2021)
Journal Article
Petropoulos, F., Apiletti, D., Assimakopoulos, V., Babai, M. Z., Barrow, D. K., Taieb, S. B., Bergmeir, C., Bessa, R. J., Bijak, J., Boylan, J. E., Browell, J., Carnevale, C., Castle, J. L., Cirillo, P., Clements, M. P., Cordeiro, C., Oliveira, F. L. C., De Baets, S., Dokumentov, A., Ellison, J., …Ziel, F. (2022). Forecasting: theory and practice. International Journal of Forecasting, 38(3), 705-871. https://doi.org/10.1016/j.ijforecast.2021.11.001

Radioactivity Monitoring in Ocean Ecosystems (RAMONES). (2021)
Presentation / Conference Contribution
Mertzimekis, T., Nomikou, P., Petra, E., Batista, P., Cabesinhas, D., Pascoal, A., Sebastião, L., Escartín, J., Kebkal, K., Karantzalos, K., Mallios, A., Nikolopoulos, K., & Maigne., L. (2021, September). Radioactivity Monitoring in Ocean Ecosystems (RAMONES). Presented at GoodIT '21: Proceedings of the Conference on Information Technology for Social Good, Rome, Italy

Natural radioactivity in the marine environment has been present since the Earth's formation, while artificial radionuclides were introduced into the oceans in 1944. More recent direct sources exist that feed the oceans, such as low-level liquid disc... Read More about Radioactivity Monitoring in Ocean Ecosystems (RAMONES)..

Operational Research in the time of COVID-19: the ‘science for better’ or worse in the absence of hard data (2021)
Journal Article
Nikolopoulos, K., Tsinopoulos, C., & Vasilakis, C. (2023). Operational Research in the time of COVID-19: the ‘science for better’ or worse in the absence of hard data. Journal of the Operational Research Society, 74(2), 448-449. https://doi.org/10.1080/01605682.2021.1930208

How can policymakers and planners make informed decisions during a pandemic? What kind of (big) data are needed, and who and when is supposed to provide these? With the Operational Research community unable to get hold of reliable hard data – especia... Read More about Operational Research in the time of COVID-19: the ‘science for better’ or worse in the absence of hard data.

Aggregate selection, individual selection, and cluster selection: an empirical evaluation and implications for systems research (2021)
Journal Article
Vangumalli, D., Nikolopoulos, K., & Litsiou, K. (2021). Aggregate selection, individual selection, and cluster selection: an empirical evaluation and implications for systems research. Cybernetics and Systems, 52(7), 553-578. https://doi.org/10.1080/01969722.2021.1902049

Data analysts when forecasting large number of time series, they regularly employ one of the following methodological approaches: either select a single forecasting method for the entire dataset (aggregate selection), or use the best forecasting meth... Read More about Aggregate selection, individual selection, and cluster selection: an empirical evaluation and implications for systems research.