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Lee, J. (author), Mitici, M.A. (author), Blom, H.A.P. (author), Bieber, Pierre (author), Freeman, Floris (author)
The increasing use of on-board sensor monitoring and data-driven algorithms has stimulated the recent shift to data-driven predictive maintenance for aircraft. This paper discusses emerging challenges for data-driven predictive aircraft maintenance. We identify new hazards associated with the introduction of data-driven technologies into...
journal article 2023
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Lee, J. (author)
Current aircraft maintenance ensures safe and reliable flight operations based on inspections repeated at fixed time intervals. The time interval between inspections is often much shorter than the average life of aircraft components, in an effort to timely detect potential failures. While this approach successfully prevents most potential...
doctoral thesis 2022
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Lee, J. (author), de Pater, I.I. (author), Boekweit, S.A. (author), Mitici, M.A. (author)
Several studies have proposed Remaining-Useful-Life (RUL) prognostics for aircraft components in the last years. However, few studies focus on integrating these RUL prognostics into maintenance planning frameworks. This paper proposes an optimization model for opportunistic maintenance scheduling of aircraft components that integrates RUL...
conference paper 2022
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Lee, J. (author), Mitici, M.A. (author)
Aircraft maintenance design aims to identify strategies that render the aircraft reliable for flight in a cost-efficient manner. These are often conflicting objectives. Moreover, existing studies on maintenance design often limit themselves to only one type of maintenance strategy, overlooking other potentially dominating designs. We propose...
journal article 2022
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Lee, J. (author), Mitici, M.A. (author), Geng, S. (author), Yang, M. (author)
When designing the maintenance of multi-component aircraft systems, we consider parameters such as safety margins (used when component replacements are scheduled), and reliability thresholds (used to define data-driven Remaining-Useful-Life prognostics of components). We propose Gaussian process learning and novel adaptive sampling techniques to...
conference paper 2022
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Lee, J. (author), Mitici, M.A. (author)
The increasing availability of sensor monitoring data has stimulated the development of Remaining-Useful-Life (RUL) prognostics and maintenance planning models. However, existing studies focus either on RUL prognostics only, or propose maintenance planning based on simple assumptions about degradation trends. We propose a framework to integrate...
journal article 2022
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Lee, J. (author), Theuwissen, A.J.P.A.M. (author)
A column-parallel 10-bit SAR ADC for high-speed image sensors has been implemented. A fast offset calibration technique using memory is proposed to compensate for the offset mismatch, accompanied by an ADC designed for a narrow space the size of a single column pitch. The memory accumulates the variation of the offset to track the offset...
journal article 2022
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Lee, J. (author), Mitici, M.A. (author)
As aircraft maintenance is transitioning towards data- driven condition-based maintenance (CBM), its cost and performance objectives need to be re-evaluated: how are these objectives related under various CBM strategies?; which objectives are conflicting?; what are the trade-offs between the conflicting objectives?; what is the impact of this...
conference paper 2021
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Lee, J. (author), Mitici, M.A. (author)
Predictive aircraft maintenance is a complex process, which requires the modeling of the stochastic degradation of aircraft systems, as well as the dynamic interactions between the stakeholders involved. In this paper, we show that the stochastically and dynamically colored Petri nets (SDCPNs) are able to formalize the predictive aircraft...
conference paper 2021
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Lee, Kookjin (author), Choi, Junhee (author), Kaczer, Ben (author), Grill, Alexander (author), Lee, Jae Woo (author), Van Beek, Simon (author), LEE, J. (author), Shin, D. (author), Lee, S. (author)
In this study, high-performance few-layered ReS<sub>2</sub> field-effect transistors (FETs), fabricated with hexagonal boron nitride (h-BN) as top/bottom dual gate dielectrics, are presented. The performance of h-BN dual gated ReS<sub>2</sub> FET having a trade-off of performance parameters is optimized using a compact model from analytical...
journal article 2021
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Lee, J. (author), Mitici, M.A. (author)
Aircraft maintenance is key for safe and efficient aircraft operations. While most studies propose cost-efficient maintenance strategies, the safety and efficiency of these strategies need to be quantified. This paper proposes a formal framework to assess the safety and efficiency of maintenance strategies by means of agent-based modelling,...
journal article 2020
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Kim, Sangmin (author), Woo, Seung Gyun (author), Lee, J. (author), Lee, Dae Hee (author), Hwang, Seokhwan (author)
Anaerobic digestion (AD) of secondary sludge is a rate-limiting step due to the bacterial cell wall. In this study, experiments were performed to characterize secondary sludges from three wastewater treatment plants (WWTPs), and to investigate the feasibility of using bacteriophage lysozymes to speed up AD by accelerating the degradation of...
journal article 2019
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Zlatanova, S. (author), van Oosterom, P.J.M. (author), Lee, J (author), Li, Ki-Joune (author), Lemmen, C. H. J. (author)
Guidance and security in large public buildings such as airports, museums and shopping malls requires much more information that traditional 2D methods offer. Therefore 3D semantically-reach models have been actively investigated with the aim to gather knowledge about availability and accessibility of spaces. Spaces can be unavailable to...
conference paper 2016
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Kim, S. (author), Lee, W. (author), Lee, B. (author), Choi, Y. (author), Lee, J. (author), Jung, K. (author), You, H. (author)
journal article 2015
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Tobón, L. (author), Chen, J. (author), Lee, J. (author), Yuan, M. (author), Zhao, B. (author), Liu, Q.H. (author)
Many system-level electromagnetic design problems are multiscale and very challenging to solve. They remain a significant barrier to system design optimization for a foreseeable future. Such multiscale problems often contain three electrical scales, i.e., the fine scale (geometrical feature size much smaller than a wavelength), the coarse scale ...
conference paper 2013
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Bharosa, N. (author), Lee, J. (author), Janssen, M. (author), Rao, H.R. (author)
One of the main challenges in cross-border disaster management is the development and use of information systems that cater the needs of heterogeneous relief agencies, policies, activities and cultures. Drawing upon activity theory, this paper examines cross-border information systems development for disaster management. We infuse the concept of...
journal article 2012
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Lee, J. (author)
journal article 2011
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Bharosa, N. (author), Lee, J. (author), Janssen, M. (author)
Although various scholars have researched issues regarding disaster management, few have studied the sharing and coordinating of information during disasters. Not much empirical data is available in this field and there is sparse insight into the factors that may impede or facilitate information sharing and coordination among stakeholders. In...
journal article 2009
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Janssen, M. (author), Lee, J. (author), Bharosa, N. (author), Cresswell, A. (author)
Multi-agency disaster management requires collaboration among geographically distributed public and private organizations to enable a rapid and effective response to an unexpected event. Many disaster management systems often lack the capability to cope with the complexity and uncertainty. In this introduction to the special issues on advances...
journal article 2009
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Van der Lee, J. (author)
Document(en) uit de collectie Chemische Procestechnologie
technical drawing 1922
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