Kristo Karjust

Prof. Dr. Kristo Karjust

Department of Mechanical and Industrial Engineering, School of Engineering, Tallinn University of Technology, 19086 Tallinn, Estonia
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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6 April 2022 in Electronics
Verified
Journal Article
Open access
PDF file
HPHeiko Pikner
Heiko Pikner
Raivo SellRaivo Sell
Raivo Sell
Jüri MajakJüri Majak
Jüri Majak
KKKristo Karjust
Kristo Karjust
Automated vehicle (AV) minibuses, i.e., AV shuttles, are gaining popularity in the testing of new types of transportation services in real traffic conditions. AV shuttles have moved from closed test areas to low-traffic public sites such as local residential areas, technology parks, university campuses, etc. These types of vehicles are usually low-speed and rely on a lidar-camera sensor set and a self-driving software stack. These new use cases are increasing these systems’ safety demands. In addition to functional safety, many other aspects need to be considered. In this study, a risk analysis model is developed, combining the fuzzy analytical hierarchy process and the Technique for Order of Preference by Similarity to Ideal Solution method. The proposed model is utilized to prioritize risks corresponding to the particular case study, based on real AV shuttle bus development, and focuses on the low-level hardware/software safety issues and improvements.

11 July 2025 in Sustainability
Verified
Journal Article
Open access
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KKKristo Karjust
Kristo Karjust
MMMarmar Mehrparvar
Marmar Mehrparvar
SKSergei Kaganski
Sergei Kaganski
Tõnis RaametsTõnis Raamets
Tõnis Raamets
Modern manufacturing systems operate in a global and competitive environment, where sustainability has become a critical driver for performance. Performance measurement, as a method for monitoring enterprise processes, plays a central role in aligning operational efficiency with sustainable development goals. Recently, a number of different frameworks, systems, and methods have been proposed for small and medium enterprises. Key performance indicators (KPIs) are known to be powerful tools which provide accurate information regarding bottlenecks and weak spots in companies. The purpose of the current study is to develop an advanced KPI selection/prioritization model and apply it in practice. The initial set of KPIs are obtained based on a literature review. The expert’s knowledge, outlier methods, and optimization of the enterprise analysis model (EAM) are utilized for reducing the initial set of KPIs. A fuzzy analytical hierarchy process (AHP) is implemented for prioritization of the criteria. Five different MCDM (multi-criteria decision-making) algorithms are implemented for prioritization of the KPIs. The recently introduced RADAR method is extended to the fuzzy RADAR method, providing a flexible approach for handling uncertainties. An analysis and comparison of the rankings obtained by utilizing five MCDM algorithms is performed. The prioritized KPIs provide valuable input for improving KPIs with the highest impact in particular small and medium-sized enterprises (SMEs) when implementing sustainability-aligned performance metrics.

10 June 2021 in Journal of Machine Engineering
Verified
Journal Article
Closed access
KMKashif Mahmood
Kashif Mahmood
KKKristo Karjust
Kristo Karjust
Tõnis RaametsTõnis Raamets
Tõnis Raamets
Recent trends in manufacturing such as Industry 4.0 have brought the researchers' attention to smart production intralogistics. AGVs, especially mobile robots play a vital role in this development. Contrarily, industrial internet technologies offered new possibilities for information exchange,...

17 July 2025 in Applied Sciences
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Journal Article
Open access
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Tõnis RaametsTõnis Raamets
Tõnis Raamets
KKKristo Karjust
Kristo Karjust
Jüri MajakJüri Majak
Jüri Majak
AHAigar Hermaste
Aigar Hermaste
Small and medium-sized enterprises (SMEs) in the manufacturing sector often struggle to make effective use of production data due to fragmented systems and limited digital infrastructure. This paper presents a case study of implementing an AI-enhanced digital twin in a custom sportswear manufacturing SME developed under the AI and Robotics Estonia (AIRE) initiative. The solution integrates real-time production data collection using the Digital Manufacturing Support Application (DIMUSA); data processing and control; clustering-based data analysis; and virtual simulation for evaluating improvement scenarios. The framework was applied in a live production environment to analyze workstation-level performance, identify recurring bottlenecks, and provide interpretable visual insights for decision-makers. K-means clustering and DBSCAN were used to group operational states and detect process anomalies, while simulation was employed to model production flow and assess potential interventions. The results demonstrate how even a lightweight AI-driven system can support human-centered decision-making, improve process transparency, and serve as a scalable foundation for Industry 5.0-aligned digital transformation in SMEs.

24 February 2021
Verified
Book Chapter
Open access
PDF file
Jüri MajakJüri Majak
Jüri Majak
MRMart Ratas
Mart Ratas
KKKristo Karjust
Kristo Karjust
BSBoris Shvartsman
Boris Shvartsman
The study is focused on the development, adaption and evaluation of the higher order Haar wavelet method (HOHWM) for solving differential equations. Accuracy and computational complexity are two measurable key characteristics of any numerical method. The HOHWM introduced recently by authors as an improvement of the widely used Haar wavelet method (HWM) has shown excellent accuracy and convergence results in the case of all model problems studied. The practical value of the proposed HOHWM approach is that it allows reduction of the computational cost by several magnitudes as compared to HWM, depending on the mesh and the method parameter values used.

1 January 2024 in AIP Conference Proceedings
Verified
Conference Paper
Open access
PDF file
Tõnis RaametsTõnis Raamets
Tõnis Raamets
Jüri MajakJüri Majak
Jüri Majak
KKKristo Karjust
Kristo Karjust
KMKashif Mahmood
Kashif Mahmood
AHAigar Hermaste
Aigar Hermaste
Today’s manufacturing companies have begun to increasingly use digital tools to increase their company production efficiency, to ensure a low-price level, high