All Outputs (41)

Capacitated lot-sizing and scheduling with sequence-dependent, period-overlapping and non-triangular setups (2011)
Journal Article
Menezes, A. A., Clark, A., & Almada-Lobo, B. (2011). Capacitated lot-sizing and scheduling with sequence-dependent, period-overlapping and non-triangular setups. Journal of Scheduling, 14(2), 209-219. https://doi.org/10.1007/s10951-010-0197-6

In production planning, sequence dependent setup times and costs are often incurred for switchovers from one product to another. When setup times and costs do not respect the triangular inequality, a situation may occur where the optimal solution inc... Read More about Capacitated lot-sizing and scheduling with sequence-dependent, period-overlapping and non-triangular setups.

Heuristic optimisation (2011)
Journal Article
Aickelin, U., & Clark, A. (2011). Heuristic optimisation. Journal of the Operational Research Society, 62(2), 251-252. https://doi.org/10.1057/jors.2010.160

Nurse rescheduling with shift preferences and minimal disruption (2011)
Journal Article
Clark, A., & Walker, H. (2011). Nurse rescheduling with shift preferences and minimal disruption

Hospital wards must be staffed 24 hours a day by a limited number of nurses. With a well documented shortage of nurses in many countries, effective scheduling of nurse shifts is crucial. Recent research on nurse scheduling has focused on creating... Read More about Nurse rescheduling with shift preferences and minimal disruption.

Simultaneous lot sizing and scheduling in a flexible flow line (2011)
Journal Article
Mahdieh, M., Bijari, M., & Clark, A. (2011). Simultaneous lot sizing and scheduling in a flexible flow line

Mathematical programming modelling tools for resource-poor countries and organisations (2010)
Journal Article
Clark, A. (2010). Mathematical programming modelling tools for resource-poor countries and organisations. Or Insight, 23(1), 57-70. https://doi.org/10.1057/ori.2009.9

In recent years, powerful mathematical modelling languages have enabled Operational Research practitioners to rapidly develop prototype tools capable of modelling complex managerial decisions such as staff shift scheduling, or production and supply c... Read More about Mathematical programming modelling tools for resource-poor countries and organisations.

Production setup-sequencing and lot-sizing at an animal nutrition plant through ATSP subtour elimination and patching (2010)
Journal Article
Toso, E. A., Clark, A., & Morabito, R. (2010). Production setup-sequencing and lot-sizing at an animal nutrition plant through ATSP subtour elimination and patching. Journal of Scheduling, 13(2), 111-121. https://doi.org/10.1007/s10951-009-0135-7

This paper considers the usefulness of a production lot sizing and scheduling model at an animal nutrition plant with sequence-dependent setup times. The model covers multiple periods and is based on the asymmetric travelling salesman problem (ATSP).... Read More about Production setup-sequencing and lot-sizing at an animal nutrition plant through ATSP subtour elimination and patching.

Lot sizing and sequencing optimisation at an animal-feed plant (2009)
Journal Article
Toso, E. A. V., Morabito, R., & Clark, A. (2009). Lot sizing and sequencing optimisation at an animal-feed plant. Computers and Industrial Engineering, 57(3), 813-821. https://doi.org/10.1016/j.cie.2009.02.011

This paper studies a challenging case of joint lot sizing and scheduling in a manufacturing plant for animal feed compounds. A key characteristic of this industry is that certain products can perform a production line "cleaning" function if a suffici... Read More about Lot sizing and sequencing optimisation at an animal-feed plant.

A genetic approach to statistical disclosure control (2009)
Journal Article
Smith, J., Clark, A., & Staggemeier, A. T. (2009). A genetic approach to statistical disclosure control

Combinação de abordagens GLSP e ATSP para o problema de dimensionamento e sequenciamento de lotes de produção de suplementos para nutrição animal (2008)
Journal Article
Toso, E. A. V., Morabito, R., & Clark, A. (2008). Combinação de abordagens GLSP e ATSP para o problema de dimensionamento e sequenciamento de lotes de produção de suplementos para nutrição animal. Pesquisa Operacional, 28(3), 423-450

In this paper we study the combination of GLSP (General Lot Sizing and Scheduling Problem) and ATSP (Asymmetric Travelling Salesman Problem) approaches with sub-tour elimination and patching to a lot sizing and sequencing problem in the animal nutrit... Read More about Combinação de abordagens GLSP e ATSP para o problema de dimensionamento e sequenciamento de lotes de produção de suplementos para nutrição animal.

Proposing a pre-processing optimisation applied to the classical integer programming model for statistical disclosure control (2008)
Presentation / Conference
Serpell, M., Clark, A., Smith, J., & Staggemeier, A. T. (2008, June). Proposing a pre-processing optimisation applied to the classical integer programming model for statistical disclosure control. Paper presented at PSD '08 Proceedings of the UNESCO Chair in data privacy international conference on Privacy in Statistical Databases

Lot sizing and furnace scheduling in small foundries (2008)
Journal Article
Arenales, M. N., de Araujo, S. A., & Clark, A. (2008). Lot sizing and furnace scheduling in small foundries. Computers and Operations Research, 35(3), 916-932. https://doi.org/10.1016/j.cor.2006.05.010

A lot sizing and scheduling problem prevalent in small market-driven foundries is studied. There are two related decision levels: (1) the furnace scheduling of metal alloy production, and (2) moulding machine planning which specifies the type and siz... Read More about Lot sizing and furnace scheduling in small foundries.

Pre-processing optimisation applied to the classical integer programming model for statistical disclosure control (2008)
Conference Proceeding
Staggemeier, A., Serpell, M., Clark, A., & Smith, J. (2008). Pre-processing optimisation applied to the classical integer programming model for statistical disclosure control. . https://doi.org/10.1007/978-3-540-87471-3_3

A pre-processing optimisation is proposed that can be applied to the integer and mixed integer linear programming models that are used to solve the cell suppression problem in statistical disclosure control. In this paper we report our initial findin... Read More about Pre-processing optimisation applied to the classical integer programming model for statistical disclosure control.

Improving our knowledge of metaheuristic approaches for cell suppression problem (2007)
Presentation / Conference
Staggemeier, A. T., Clark, A., Smith, J., & Thompson, J. (2007, December). Improving our knowledge of metaheuristic approaches for cell suppression problem. Paper presented at Proceedings of Joint UNECE/Eurostat work session on statistical data confidentiality, Manchester, UK

Joint rolling-horizon scheduling of materials processing and lot-sizing with sequence-dependent setups (2007)
Journal Article
De Araujo, S. A., Arenales, M. N., & Clark, A. (2007). Joint rolling-horizon scheduling of materials processing and lot-sizing with sequence-dependent setups. Journal of Heuristics, 13(4), 337-358. https://doi.org/10.1007/s10732-007-9011-9

A lot sizing and scheduling problem from a foundry is considered in which key materials are produced and then transformed into many products on a single machine. A mixed integer programming (MIP) model is developed, taking into account sequence-depen... Read More about Joint rolling-horizon scheduling of materials processing and lot-sizing with sequence-dependent setups.

Rolling horizon heuristics for production planning and set-up scheduling with backlogs and error-prone demand forecasts (2005)
Journal Article
Clark, A. (2005). Rolling horizon heuristics for production planning and set-up scheduling with backlogs and error-prone demand forecasts. Production Planning and Control, 16(1), 81-97. https://doi.org/10.1080/09537280412331286565

Three families of models and fast heuristic methods are developed for identifying a production plan and immediate set-up schedule for a manufacturing line with changeover times. The initial model is exact, but is optimally solvable only for very shor... Read More about Rolling horizon heuristics for production planning and set-up scheduling with backlogs and error-prone demand forecasts.

Hybrid heuristics for planning lot setups and sizes (2003)
Journal Article
Clark, A. (2003). Hybrid heuristics for planning lot setups and sizes. Computers and Industrial Engineering, 45(4), 545-562. https://doi.org/10.1016/S0360-8352%2803%2900073-1

The planning of a canning line at a drinks manufacturer is discussed and formulated as a mathematical programming model. Several alternative heuristic solution methods are developed, tested and compared on real data, illustrating the trade-offs betwe... Read More about Hybrid heuristics for planning lot setups and sizes.

Genetic algorithm and linear programing to solve a lot-sizing and scheduling problem (2003)
Presentation / Conference
Staggemeier, A. T., Clark, A., Smith, J., & Bull, L. (2003, April). Genetic algorithm and linear programing to solve a lot-sizing and scheduling problem. Paper presented at Proceedings of the 6th Biannual Model and Algorithms to Production and Scheduling Problems 2003, Aussois, France

A survey of lot-sizing and scheduling models (2001)
Presentation / Conference
Staggemeier, A. T., & Clark, A. (2001, November). A survey of lot-sizing and scheduling models. Paper presented at 33rd Annual Symposium of the Brazilian Operational Research Society (SOBRAPO), Campos do Jordão SP, Brazil

Do the right thing: When clients aren't clear about what they want (1998)
Journal Article
Clark, A., & Campos, D. (1998). Do the right thing: When clients aren't clear about what they want. Or Insight, 11(2), 24-27. https://doi.org/10.1057/ori.1998.12

A heuristic method for lot-sizing in multi-stage systems (1997)
Journal Article
Clark, A. R., Armentano, V. A., França, P. M., França, P. M., Armentano, V. A., Berretta, R. E., & Clark, A. (1997). A heuristic method for lot-sizing in multi-stage systems. Computers and Operations Research, 24(9), 861-874. https://doi.org/10.1016/S0305-0548%2896%2900097-4

This article considers the lot-sizing problem in multi-stage production settings with capacity-constrained resources. This problem deals with the determination of a production plan for the end item and its components in order to meet the forecast dem... Read More about A heuristic method for lot-sizing in multi-stage systems.