document

Control synthesis for linear parametric time-varying systems

Terlouw, J.C. (author), Bennani, S. (author)

Designing auto-pilots with classical controller design methods such as root-locus may be a laborious job and it requires a lot of experience to arrive at satisfactory controllers. The single loop closure techniques that are common practice for most aircraft manufacturers are mainly appreciated because of the vast amount of experience gained in...

report 1994

document

Skeleton-based design and simulation flow for Computation-in-Memory architectures

Yu, J. (author), Nane, R. (author), Haron, M.A.B. (author), Hamdioui, S. (author), Corporaal, H (author), Bertels, K.L.M. (author)

Memristor-based Computation-in-Memory is one of the emerging architectures proposed to deal with Big Data problems. The design of such architectures requires a radically new automatic design flow because the memristor is a passive device that uses resistance to encode its logic value. This paper proposes a design flow for mapping parallel...

conference paper 2016

document

Optimal scheduling and routing of free-range AGVs at large scale automated container terminals

Corman, F. (author), Xin, J. (author), Negenborn, R.R. (author), D'ariano, A. (author), Sama, M. (author), Toli, A. (author), Lodewijks, G. (author)

This work tackles the problem of controlling operations at an automated container terminal. In the context of large supply chains, there is a growing trend for increasing productivity and economic efficiency. New optimization models and algorithms are provided for scheduling and routing equipment that is moving containers in a quay area,...

journal article 2016

document

Review of energy-efficient train control and timetabling

Scheepmaker, G.M. (author), Goverde, R.M.P. (author), Kroon, Leo (author)

The energy consumption of trains is highly efficient due to the low friction between steel wheels and rails, although the efficiency is also influenced largely by the driving strategy applied and the scheduled running times in the timetable. Optimal energy-efficient driving strategies can reduce operating costs significantly and contribute to a...

journal article 2016

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On a tandem queue with batch service and its applications in wireless sensor networks

Mitici, M.A. (author), Goseling, Jasper (author), van Ommeren, Jan Kees (author), de Graaf, Maurits (author), Boucherie, Richard J. (author)

We present a tandem network of queues 0 , ⋯ , s- 1. Customers arrive at queue 0 according to a Poisson process with rate λ. There are s independent batch service processes at exponential rates μ₀, ⋯ , μ_s _- ₁. Service process i, i= 0 , ⋯ , s- 1 , at rate μ_i is such that all customers of...

journal article 2017

document

Complexity of Scheduling Charging in the Smart Grid: Extended Abstract

de Weerdt, M.M. (author), Albert, Michael (author), Conitzer, Vincent (author), van der Linden, J.G.M. (author)

The problem of optimally scheduling the charging demand of electric vehicles within the constraints of the electricity infrastructure is called the charge scheduling problem. The models of the charging speed, horizon, and charging demand determine the computational complexity of the charge scheduling problem. For about 20 variants the problem is...

conference paper 2018

document

A New Model Proposal for Integrated Satellite Constellation Scheduling within a Planning Horizon given Operational Constraints

Pinto, M.J. (author), Barros, A.I. (author), Noomen, R. (author), van Gelder, P.H.A.J.M. (author), Lamballais Tessensohn, T (author)

The operational use of satellite systems has been increasing due to technological advances and the reduced costs of satellites and their launching. As such it has become more relevant to determine how to better use these new capabilities which is reflected in an increase in application studies in this area. This work focuses on the problem of...

conference paper 2018

document

Coordinated optimization of equipment operations in a container terminal

Jonker, Tim (author), Duinkerken, M.B. (author), Yorke-Smith, N. (author), de Waal, A. (author), Negenborn, R.R. (author)

Increasing international maritime transport drives the need for efficient container terminals. The speed at which containers can be processed through a terminal is an important performance indicator. In particular, the productivity of the quay cranes (QCs) determines the performance of a container terminal; hence QC scheduling has received...

journal article 2019

document

Determinants of bus riding time deviations: Relationship between driving patterns and transit performance

Cats, O. (author)

Urban bus services are subject to high levels of uncertainty and disturbances. Methods to determine the timetable are designed to absorb variations in riding times between stops by allocating additional travel time. The propagation of service unreliability along the route could be restrained by drivers' adjustment at stops and between stops....

journal article 2019

document

Fair multiple-workflow scheduling with different quality-of-service goals

Rezaeian, Amin (author), Naghibzadeh, Mahmoud (author), Epema, D.H.J. (author)

Cloud schedulers that allocate resources exclusively to single workflows are not work-conserving as they may be forced to leave gaps in their schedules because of the precedence constraints in the workflows. Thus, they may lead to a waste of financial resources. This problem can be mitigated by multiple-workflow schedulers that share the...

journal article 2019

document

A practical dynamic programming based methodology for aircraft maintenance check scheduling optimization

Deng, Q. (author), Santos, Bruno F. (author), Curran, R. (author)

This paper presents a practical dynamic programming based methodology to optimize the long-term maintenance check schedule for a fleet of heterogeneous aircraft. It is the first time that the long-term aircraft maintenance check schedule is optimized, integrating different check types in a single schedule solution. The proposed methodology...

journal article 2020

document

The effect of price-optimized charging on electric vehicle fleet emissions

Ghotge, R. (author), Paanakker, Marnix (author), van Wijk, A.J.M. (author), Baeten, Brecht (author), Lukszo, Z. (author)

Aggregation of sufficiently large electric vehicle (EV) fleets and control over their charging schedules enables aggregators to utilise the flexibility of EV charging in the Day Ahead Market. Optimising the charge scheduling of such fleets enables time-shifting of electricity demand to hours when electricity is cheaper, reducing the...

conference paper 2020

document

Automated wind turbine maintenance scheduling

Yürüşen, Nurseda Y. (author), Rowley, Paul N. (author), Watson, S.J. (author), Melero, Julio J. (author)

While many operation and maintenance (O&M) decision support systems (DSS) have been already proposed, a serious research need still exists for wind farm O&M scheduling. O&M planning is a challenging task, as maintenance teams must follow specific procedures when performing their service, which requires working at height in adverse...

journal article 2020

document

Secure Multi-party Co-planning of Barge Departures

Larsen, R.B. (author), Baksteen, Ruud (author), Atasoy, B. (author), Negenborn, R.R. (author)

Container transport requires real-time control and a high degree of cooperation to alleviate disturbances and perform smoothly without unnecessary environmental impact and monetary losses. The involved operators are, however, often reluctant to cooperate as they fear loosing valuable information and autonomy, eventually leading their clients...

journal article 2021

document

Robust Long-Term Aircraft Heavy Maintenance Check Scheduling Optimization under Uncertainty

van der Weide, Tim (author), Deng, Q. (author), Santos, Bruno F. (author)

Long-term heavy maintenance check schedules are crucial in the aviation industry since airlines need them to prepare the required maintenance tools, workforce, and aircraft spare parts. However, most airlines adopt a manual approach to plan the heavy maintenance check schedules in current practice. This manual process relies on the experience of...

journal article 2021

document

Lookahead Approximate Dynamic Programming for Stochastic Aircraft Maintenance Check Scheduling Optimization

Deng, Q. (author), Santos, Bruno F. (author)

This paper proposes a lookahead approximate dynamic programming methodology for aircraft maintenance check scheduling, considering the uncertainty of aircraft daily utilization and maintenance check elapsed time. It adopts a dynamic programming framework, using a hybrid lookahead scheduling policy. The hybrid lookahead scheduling policy makes...

journal article 2021

document

A bin packing approach to solve the aircraft maintenance task allocation problem

Witteman, Max (author), Deng, Q. (author), Santos, Bruno F. (author)

This paper addresses the scheduling of aircraft maintenance tasks that must be carried out in multiple maintenance checks to keep a fleet of aircraft airworthy. The allocation of maintenance tasks to maintenance opportunities, also known as the task allocation problem (TAP), is a complex combinatorial problem that needs to be solved daily by...

journal article 2021

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Single-machine scheduling with release times, deadlines, setup times, and rejection

de Weerdt, M.M. (author), Baart, Robert (author), He, L. (author)

Single-machine scheduling where jobs have a penalty for being late or for being rejected altogether is an important (sub)problem in manufacturing, logistics, and satellite scheduling. It is known to be NP-hard in the strong sense, and there is no polynomial-time algorithm that can guarantee a constant-factor approximation (unless P=NP). We...

journal article 2021

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Electric flight scheduling with battery-charging and battery-swapping opportunities

Mitici, M.A. (author), Ramos Pereira, M. (author), Oliviero, F. (author)

With the current advances in aircraft design and Lithium-Ion batteries, electric aircraft are expected to serve as a replacement for conventional, short-range aircraft. This paper addresses the main operational challenges for short-range flights operated with electric aircraft: determining the investment needs for a fleet of electric aircraft,...

journal article 2022

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An adaptive robust optimization model for parallel machine scheduling

Cohen, Izack (author), Postek, K.S. (author), Shtern, Shimrit (author)

Real-life parallel machine scheduling problems can be characterized by: (i) limited information about the exact task duration at the scheduling time, and (ii) an opportunity to reschedule the remaining tasks each time a task processing is completed and a machine becomes idle. Robust optimization is the natural methodology to cope with the first...

journal article 2022