- document
-
McDonald, Tom (author), Tsay, Calvin (author), Schweidtmann, A.M. (author), Yorke-Smith, N. (author)ReLU neural networks have been modelled as constraints in mixed integer linear programming (MILP), enabling surrogate-based optimisation in various domains and efficient solution of machine learning certification problems. However, previous works are mostly limited to MLPs. Graph neural networks (GNNs) can learn from non-euclidean data...journal article 2024
- document
-
Geursen, Isaak L. (author), Santos, Bruno F. (author), Yorke-Smith, N. (author)Current state-of-the-art airline planning models face computational limitations, restricting the operational applicability to problems of representative sizes. This is particularly the case when considering the uncertainty necessarily associated with the long-term plan of an aircraft fleet. Considering the growing interest in the application of...journal article 2023
- document
-
Eigbe, E. (author), De Schutter, B.H.K. (author), Nasri, Mitra (author), Yorke-Smith, N. (author)Industrial and academic interest converge on scheduling flow shops with sequence- and time-dependent maintenance. We posit that anticipatory, integrated scheduling of operational and maintenance tasks leads to superior performance to purely 'wait-then-fix' handling of the maintenance tasks. Motivated by an industrial problem with (sequence...journal article 2023
- document
-
Nadi Najafabadi, A. (author), Yorke-Smith, N. (author), Snelder, M. (author), van Lint, J.W.C. (author), Tavasszy, Lorant (author)Understanding preferences and behaviours in road freight transport is valuable for planning and analysis. This paper proposes a data-driven vehicle routing and scheduling approach for use as a descriptive tool to study road freight transport activities. The model developed seeks to capture planners’ or drivers’ preferences in order to...journal article 2023
- document
-
Xu, Y. (author), Krishnakumari, P.K. (author), Yorke-Smith, N. (author), Hoogendoorn, S.P. (author)COVID-19 significantly influenced travel behaviours and public attitudes towards public transport. Various studies have illustrated complicated factors related to long-term travel behaviour, indicating difficulty in understanding and predicting post-pandemic long-term travel behaviour via traditional methods. In these complex circumstances,...conference paper 2023
- document
-
Wenink, Robert (author), van der Eijk, M. (author), Yorke-Smith, N. (author), Wellens, P.R. (author)Surrogate modelling techniques such as Kriging are a popular means for cheaply emulating the response of expensive Computational Fluid Dynamics (CFD) simulations. These surrogate models are often used for exploring a parameterised design space and identifying optimal designs. Multi-fidelity Kriging extends the methodology to incorporate data...journal article 2023
- document
-
van Bokkem, Dirk (author), van den Hemel, Max (author), Dumančić, S. (author), Yorke-Smith, N. (author)Increasing global food demand, accompanied by the limited number of expert growers, brings the need for more sustainable and efficient horticulture. The controlled environment of greenhouses enable data collection and precise control. For optimally controlling the greenhouse climate, a grower not only looks at crop production, but rather aims...conference paper 2023
- document
-
Horn, M.G. (author), Demirović, E. (author), Yorke-Smith, N. (author)We solve a challenging scheduling problem with parallel batch processing and two-dimensional shelf strip packing constraints that arises in the tool coating field. Tools are assembled on so-called planetaries (batches) before they are loaded into coating machines to get coated. The assembling is not trivial and must fulfil specific...journal article 2023
- document
-
Telang, Pankaj R. (author), Singh, Munindar P. (author), Yorke-Smith, N. (author)Social commitments are recognized as an abstraction that enables flexible coordination between autonomous agents. We make these contributions. First, we introduce and formalize a concept of a maintenance commitment, a kind of social commitment characterized by a maintenance condition whose truthhood an agent commits to maintain. This concept...journal article 2023
- document
-
Horn, M.G. (author), Demirović, E. (author), Yorke-Smith, N. (author)In the tool coating field, scheduling of production lines requires solving an optimisation problem which we call the multi-choice two-dimensional shelf strip packing problem with time windows. A set of rectangular items needs to be packed in two stages: items are placed on shelves, which in turn are placed on one of several available strips....journal article 2023
- document
-
Saur, R. (author), la Poutré, J.A. (author), Yorke-Smith, N. (author)The adoption of new market mechanisms - vital to the better integration of flexible assets - depends on the fairness and nondiscrimination of the pricing rules. We consider a market setting with time-flexible unit energy buyers and sellers, that additionally submit their availability in time. The time-flexibility of the agents allows for...journal article 2023
- document
-
Li, Y. (author), Yorke-Smith, N. (author), Keviczky, T. (author)Towards integrating renewable electricity generation sources into the grid, an important facilitator is the energy flexibility provided by buildings' thermal inertia. Most of the existing research follows a single-step price- or incentive-based scheme for unlocking the flexibility potential of buildings. In contrast, this paper proposes a...conference paper 2023
- document
-
Thorbjarnarson, Tómas (author), Yorke-Smith, N. (author)Recent work has shown potential in using Mixed Integer Programming (MIP) solvers to optimize certain aspects of neural networks (NNs). However the intriguing approach of training NNs with MIP solvers is under-explored. State-of-the-art-methods to train NNs are typically gradient-based and require significant data, computation on GPUs, and...journal article 2023
- document
-
Efthymiou, N. (author), Yorke-Smith, N. (author)Since combinatorial scheduling problems are usually NP-hard, this paper investigates whether machine learning (ML) can accelerate exact solving of a problem instance. We adopt supervised learning on a corpus of problem instances, to acquire a function that predicts the optimal makespan for a given instance. The learned predictor is invariant to...conference paper 2023
- document
-
Harland, James (author), Thangarajah, John (author), Yorke-Smith, N. (author)Deliberation over goals is a fundamental feature of intelligent agent systems. In this article we provide pragmatic but principled mechanisms for quantifying the level of completeness of goals in a Belief-Desire-Intention (BDI) agent. Our approach leverages previous work on resource and effects summarization which we extend by accommodating both...journal article 2022
- document
-
Hugtenburg, S. (author), Yorke-Smith, N. (author)Delftse Foundations of Computation is a textbook for a one quarter introductory course in theoretical computer science. It includes topics from propositional and predicate logic, proof techniques, set theory and the theory of computation, along with practical applications to computer science. It has no prerequisites other than a general...book 2022
- document
-
Lin, Chaoning (author), Li, Tongchun (author), Chen, Siyu (author), Yuan, Li (author), van Gelder, P.H.A.J.M. (author), Yorke-Smith, N. (author)Dam safety monitoring has become an important topic and is critical for evaluating a dam's safety status. This study focuses on identifying the mechanical properties of a concrete dam from long-term viscoelastic deformation monitoring data. A novel inversion framework is proposed in which a surrogate model, instead of the finite element model,...journal article 2022
- document
-
Pingen, Geert L.J. (author), van Ommeren, Christian R. (author), van Leeuwen, Cornelis J. (author), Fransen, Ruben W. (author), Elfrink, Tijmen (author), de Vries, Yorick C. (author), Karunakaran, Janarthanan (author), Demirović, E. (author), Yorke-Smith, N. (author)Logistics planning is a complex optimization problem involving multiple decision makers. Automated scheduling systems offer support to human planners; however state-of-the-art approaches often employ a centralized control paradigm. While these approaches have shown great value, their application is hindered in dynamic settings with no central...conference paper 2022
- document
-
van der Steeg, Jaap Jan (author), Oudshoorn, Menno (author), Yorke-Smith, N. (author)With the increasing volume of container freight transport, future port planning is crucial. Simulation models provide a means to gain insight in the effects of terminal expansions. Detailed simulations incorporate berth allocation: assigning vessels a time and location at the quay wall, where the vessel is loaded and unloaded. This article...journal article 2022
- document
-
Termos, Ali (author), Yorke-Smith, N. (author)At a geographical and strategic confluence, the ancient city of Beirut, Lebanon, has witnessed crises from natural and human causes over the centuries. The modern urban and peri-urban development is a result of neo-classical economics, laissez-faire regulations, and complex socio-political structures. This article considers the contemporary...journal article 2022