Patrik Zajec

Mr. Patrik Zajec

orcid

Research Focus & Metrics

Academic Career Length

6Years (2021-Present)

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

Representative Publications

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7 November 2022 in International Journal of Production Research
Verified
Journal Article
Open access
Jože RožanecJože Rožanec
Jože Rožanec
INInna Novalija
Inna Novalija
PZPatrik Zajec
Patrik Zajec
Klemen KendaKlemen Kenda
Klemen Kenda
HGHooman Tavakoli Ghinani
Hooman Tavakoli Ghinani
JSJohn Soldatos
John Soldatos
Human-centricity is the core value behind the evolution of manufacturing towards Industry 5.0. Nevertheless, there is a lack of architecture that considers safety, trustworthiness, and human-centricity at its core. Therefore, we propose an architecture that integrates Artificial Intelligence (Active Learning, Forecasting, Explainable Artificial Intelligence), simulated reality, decision-making, and users' feedback, focussing on synergies between humans and machines. Furthermore, we align the proposed architecture with the Big Data Value Association Reference Architecture Model. Finally, we validate it on three use cases from real-world case studies.

27 February 2024 in International Journal of Production Research
Verified
Journal Article
Open access
PZPatrik Zajec
Patrik Zajec
Jože RožanecJože Rožanec
Jože Rožanec
STSpyros Theodoropoulos
Spyros Theodoropoulos
MFMihail Fontul
Mihail Fontul
EKErik Koehorst
Erik Koehorst
DMDunja_Mladenic Mladenic
Dunja_Mladenic Mladenic

16 March 2023 in Journal of Intelligent Manufacturing
Verified
Journal Article
Open access
PDF file
Jože RožanecJože Rožanec
Jože Rožanec
LBLuka Bizjak
Luka Bizjak
ETElena Trajkova
Elena Trajkova
PZPatrik Zajec
Patrik Zajec
JKJelle Keizer
Jelle Keizer
DMDunja_Mladenic Mladenic
Dunja_Mladenic Mladenic
Quality control is a crucial activity performed by manufacturing enterprises to ensure that their products meet quality standards and avoid potential damage to the brand’s reputation. The decreased cost of sensors and connectivity enabled increasing digitalization of manufacturing. In addition, artificial intelligence enables higher degrees of automation, reducing overall costs and time required for defect inspection. This research compares three active learning approaches, having single and multiple oracles, to visual inspection. Six new metrics are proposed to assess the quality of calibration without the need for ground truth. Furthermore, this research explores whether existing calibrators can improve performance by leveraging an approximate ground truth to enlarge the calibration set. The experiments were performed on real-world data provided by Philips Consumer Lifestyle BV. Our results show that the explored active learning settings can reduce the data labeling effort by between three and four percent without detriment to the overall quality goals, considering a threshold of p = 0.95. Furthermore, the results show that the proposed calibration metrics successfully capture relevant information otherwise available to metrics used up to date only through ground truth data. Therefore, the proposed metrics can be used to estimate the quality of models’ probability calibration without committing to a labeling effort to obtain ground truth data.

9 June 2021
Verified
Book Chapter
Closed access
PDF file
Jože RožanecJože Rožanec
Jože Rožanec
PZPatrik Zajec
Patrik Zajec
Klemen KendaKlemen Kenda
Klemen Kenda
INInna Novalija
Inna Novalija
BFBlaž Fortuna
Blaž Fortuna
DMDunja Mladenić
Dunja Mladenić

29 April 2022 in Future Internet
Verified
Journal Article
Open access
PDF file
Jože RožanecJože Rožanec
Jože Rožanec
ETElena Trajkova
Elena Trajkova
INInna Novalija
Inna Novalija
PZPatrik Zajec
Patrik Zajec
Klemen KendaKlemen Kenda
Klemen Kenda
DMDunja_Mladenic Mladenic
Dunja_Mladenic Mladenic
Artificial intelligence models are increasingly used in manufacturing to inform decision making. Responsible decision making requires accurate forecasts and an understanding of the models’ behavior. Furthermore, the insights into the models’ rationale can be enriched with domain knowledge. This research builds explanations considering feature rankings for a particular forecast, enriching them with media news entries, datasets’ metadata, and entries from the Google knowledge graph. We compare two approaches (embeddings-based and semantic-based) on a real-world use case regarding demand forecasting. The embeddings-based approach measures the similarity between relevant concepts and retrieved media news entries and datasets’ metadata based on the word movers’ distance between embeddings. The semantic-based approach recourses to wikification and measures the Jaccard distance instead. The semantic-based approach leads to more diverse entries when displaying media events and more precise and diverse results regarding recommended datasets. We conclude that the explanations provided can be further improved with information regarding the purpose of potential actions that can be taken to influence demand and to provide “what-if” analysis capabilities.

16 November 2021 in Information
Verified
Journal Article
Open access
PDF file
PZPatrik Zajec
Patrik Zajec
Jože RožanecJože Rožanec
Jože Rožanec
ETElena Trajkova
Elena Trajkova
INInna Novalija
Inna Novalija
Klemen KendaKlemen Kenda
Klemen Kenda
DMDunja_Mladenic Mladenic
Dunja_Mladenic Mladenic
This research work describes an architecture for building a system that guides a user from a forecast generated by a machine learning model through a sequence of decision-making steps. The system is demonstrated in a manufacturing demand forecasting use case and can be extended to other domains. In addition, the system provides the means for knowledge acquisition by gathering data from users. Finally, it implements an active learning component and compares multiple strategies to recommend media news to the user. We compare such strategies through a set of experiments to understand how they balance learning and provide accurate media news recommendations to the user. The media news aims to provide additional context to demand forecasts and enhance judgment on decision-making.