Magnus Wiktorsson

Effect of front–back wave asymmetry on a hydraulic power take off system

S. Zeinali, Georg Lindgren, Jan Forsberg, Johan Lindström et autres

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Detection of Bark Beetle Attacks Using Time-Aggregated Satellite Data with Machine Learning

S. Zeinali, Per‐Ola Olsson, Ted Kronvall, Magnus Wiktorsson et autres

In this study, we explored how early bark beetle attacks can be detected using weekly aggregated Sentinel-2 data in combination with static data, such as geo- and forestry data. We used an XGBoost classifier, known for its strength and reliability in classification, …

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Exploring Supply Chain Visibility for Circularity: A Delphi Approach

Tarun Kumar Agrawal, Ravi Kalaiarasan, Sayyed Shoaib-ul-Hasan, Seyoum Eshetu Birkie et autres

ABSTRACT Circular supply chains (CSCs) depend on enhanced supply chain visibility (SCV) to track and manage resource flows and thereby enable efficient decision‐making. Despite confronting silo mentalities, fragmented information, technological barriers, resistance to change, and a lack of standardization, data sharing remains …

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Toward Self-Organizing Production Logistics: A Multi-Agent Approach

Jan-Felix Klein, Yongkuk Jeong, Erik Flores-García, Magnus Wiktorsson

Production logistics (PL) is increasingly exposed to variability, dynamic interdependencies, and operational disturbances that challenge conventional centralized planning and control. These characteristics are particularly pronounced in circular production systems, but are increasingly relevant across PL more generally. This paper addresses this challenge …

Toward Self-Organizing Production Logistics: A Multi-Agent Approach

Jan-Felix Klein, Yongkuk Jeong, Erik Flores-García, Magnus Wiktorsson

Production logistics (PL) is increasingly exposed to variability, dynamic interdependencies, and operational disturbances that challenge conventional centralized planning and control. These characteristics are particularly pronounced in circular production systems, but are increasingly relevant across PL more generally. This paper addresses this challenge …

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First to reach n game

Stanislav Volkov, Magnus Wiktorsson

We consider a game with two players, consisting of a number of rounds, where the first player to win n rounds becomes the overall winner. Who wins each individual round is governed by a certain urn having two types of balls (type …

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Stability in quadratic variation

Philip Kennerberg, Magnus Wiktorsson

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Learning to Disentangle Forest Health: A Conditional Variational Autoencoder Approach to Satellite Time-Series

S. Zeinali, Johan Lindström, Ted Kronvall, Magnus Wiktorsson et autres

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A comparison of approaches integrating power take-off systems into wave energy converters simulations

X. Shao, J.W. Ringsberg, H.-D. Yao, E. Johnson et autres

In the design of a wave energy converter (WEC) in general, one critical aspect is to develop the power take-off (PTO) system since it has a significant impact on the overall energy harnessing efficiency. Therefore, the modelling of a PTO system should …

The effects of sea-state on optimal generator parameters for a wave energy converter

S. Zeinali, Magnus Wiktorsson, Johan Lindström, Georg Lindgren et autres

The power take-off (PTO) system and control laws for wave energy converters (WECs) are crucial for system performance. Determining optimal PTO parameters based on different sea states is key for formulating control laws, identifying optimal WEC locations, and optimizing wave-to-wire performance. This …

Optimizing the hydraulic power take-off system in a wave energy converter

S. Zeinali, Magnus Wiktorsson, Jan Forsberg, Georg Lindgren et autres

This study aims to determine the optimal pressure for the accumulator tank in a wave energy converter (WEC) with hydraulic power take-off (PTO) to maximize energy generation. A simulation-based approach was employed to analyze the buoy’s performance with wave data generated from …

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Stability in quadratic variation

Philip Kennerberg, Magnus Wiktorsson

Consider a sequence of cadlag processes $\{X^n\}_n$, and some fixed function $f$. If $f$ is continuous then under several modes of convergence $X^n\to X$ implies corresponding convergence of $f(X^n)\to f(X)$, due to continuous mapping. We study conditions (on $f$, $\{X^n\}_n$ and $X$) …