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Brander, Pär
Publications (10 of 16) Show all publications
Brander, P. & Segerstedt, A. (2009). Economic lot scheduling problems incorporating a cost of using the production facility (ed.). Paper presented at . International Journal of Production Research, 47(13), 3611-3624
Open this publication in new window or tab >>Economic lot scheduling problems incorporating a cost of using the production facility
2009 (English)In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 47, no 13, p. 3611-3624Article in journal (Refereed) Published
Abstract [en]

This paper considers scheduling the production of several different items on a single machine with constrained capacity, commonly known as the Economic Lot Scheduling Problem (ELSP). Most traditional approaches for the ELSP consider the sum of the setup cost and inventory holding cost and provide cyclic schedules that minimize this sum. In practice, there are not only costs for setups and inventory holding, but also costs for operating the production facility due to e.g. electricity, service, maintenance, tools, operators etc, which depend on the number of hours the facility is operating per working day. In this paper, we modify the traditional cost function to include not only setup and inventory holding cost but also a time variable cost for operating the production facility. The paper shows it is possible to adapt a previous heuristic procedure to this complemented cost. The model can help to determine cyclic schedules and the number of production hours per working day.

National Category
Production Engineering, Human Work Science and Ergonomics
Research subject
Industrial Logistics
Identifiers
urn:nbn:se:ltu:diva-5865 (URN)10.1080/00207540801908076 (DOI)000266086800009 ()2-s2.0-70449623048 (Scopus ID)40eba7f0-9b8e-11dd-94de-000ea68e967b (Local ID)40eba7f0-9b8e-11dd-94de-000ea68e967b (Archive number)40eba7f0-9b8e-11dd-94de-000ea68e967b (OAI)
Note
Validerad; 2009; 20081016 (keni)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Sluis, E. v., Segerstedt, A., Abdul-Jalbar, B. & Brander, P. (2008). Economic lot scheduling problems with new and different cost approximations (ed.). In: (Ed.), (Ed.), Book of Abstracts, 15th International Symposium on Inventories, Budapest, Hungary, Aug. 2008: . Paper presented at International Symposium on Inventories : 22/08/2008 - 26/08/2008.
Open this publication in new window or tab >>Economic lot scheduling problems with new and different cost approximations
2008 (English)In: Book of Abstracts, 15th International Symposium on Inventories, Budapest, Hungary, Aug. 2008, 2008Conference paper, Meeting abstract (Other academic)
Abstract [en]

This paper considers scheduling the production of several different items on a single machine with constrained capacity, commonly known as the Economic Lot Scheduling Problem (ELSP). Nilsson and Segerstedt (2008) show that even for ELSP problems with high utilisation it is possible to find a feasible solution (fulfilling feasibility conditions from Eilon (1962), Goyal (1975), Segerstedt (1999)), but the real inventory holding cost is often higher than the common used approximation. This is because the production of an item has to start before the inventory of the same item reaches zero, to avoid a future shortage of the same item. The common cycle solution always presents the "right" inventory holding cost; but diversifications of the frequencies may not accomplish what it promises. Most traditional approaches for the ELSP consider only the sum of the setup cost and inventory holding cost and provide cyclicschedules that minimize this sum. In practice, there are not only costs for setups and inventory holding, but also costs for operating the production facility due to e.g. electricity, service, maintenance, tools, operators etc, which depend on the number of hours the facilityis operating per working day (cf. Brander and Segerstedt (2008).Our investigations in this paper find a solution method that can evaluate different schedulesdue to different frequencies, and find the right inventory holding cost without the common approximation and combine it with a facility time variable cost as in this paper. We start from an idea from Cooke et al (2004) and van der Sluis (2006). A mixed integer programming (MIP) problem that from a common time period and integer number of frequencies for each item minimises costs and avoids shortages. But we try to avoid MIP and its long calculation times, when in our case to find the best solution several MIP calculations have to be done after each other.

National Category
Production Engineering, Human Work Science and Ergonomics
Research subject
Industrial Logistics
Identifiers
urn:nbn:se:ltu:diva-40035 (URN)f0152710-ba24-11dd-b223-000ea68e967b (Local ID)f0152710-ba24-11dd-b223-000ea68e967b (Archive number)f0152710-ba24-11dd-b223-000ea68e967b (OAI)
Conference
International Symposium on Inventories : 22/08/2008 - 26/08/2008
Note
Godkänd; 2008; 20081124 (keni)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2018-04-10Bibliographically approved
Brander, P. & Forsberg, R. (2007). Safety stocks for cyclic schedules with stochastic operation times and setup times (ed.). Paper presented at International Symposium on Inventories : 22/08/2004 - 24/08/2004. International Journal of Production Economics, 108(1-2)
Open this publication in new window or tab >>Safety stocks for cyclic schedules with stochastic operation times and setup times
2007 (English)In: International Journal of Production Economics, ISSN 0925-5273, E-ISSN 1873-7579, Vol. 108, no 1-2Article in journal, Meeting abstract (Other academic) Published
National Category
Production Engineering, Human Work Science and Ergonomics
Research subject
Industrial Logistics
Identifiers
urn:nbn:se:ltu:diva-29904 (URN)38591760-77cf-11db-962b-000ea68e967b (Local ID)38591760-77cf-11db-962b-000ea68e967b (Archive number)38591760-77cf-11db-962b-000ea68e967b (OAI)
Conference
International Symposium on Inventories : 22/08/2004 - 24/08/2004
Note
Godkänd; 2007; Bibliografisk uppgift: Principles and practices of managing inventories - Selected papers of the thirteenth international symposium on inventories; 20061119 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-30Bibliographically approved
Brander, P. & Forsberg, R. (2006). Determination of safety stocks for cyclic schedules with stochastic demands (ed.). Paper presented at . International Journal of Production Economics, 104(2), 271-295
Open this publication in new window or tab >>Determination of safety stocks for cyclic schedules with stochastic demands
2006 (English)In: International Journal of Production Economics, ISSN 0925-5273, E-ISSN 1873-7579, Vol. 104, no 2, p. 271-295Article in journal (Refereed) Published
Abstract [en]

This paper considers the problem of scheduling the production of multiple items, each with random demand, on a single facility. We show how the variance in demand during lead time can be estimated and present a model for determination of safety stocks and order-up-to levels for a fixed cyclic sequence, both with and without idle time. For systems with idle time, we present a control model to make the decision to produce next item in sequence or idle the facility. The performance of the model is tested in a simulation study.

National Category
Production Engineering, Human Work Science and Ergonomics
Research subject
Industrial Logistics
Identifiers
urn:nbn:se:ltu:diva-12508 (URN)10.1016/j.ijpe.2004.11.009 (DOI)000241223300003 ()2-s2.0-33748743959 (Scopus ID)bab3c880-764f-11db-962b-000ea68e967b (Local ID)bab3c880-764f-11db-962b-000ea68e967b (Archive number)bab3c880-764f-11db-962b-000ea68e967b (OAI)
Note
Validerad; 2006; 20061117 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Brander, P. & Segerstedt, A. (2006). Economic lot scheduling problems with a time-varying facility cost (ed.). In: (Ed.), (Ed.), Proceedings, Igls 2006: . Paper presented at International Working Seminar on Production Economics : 20/02/2006 - 24/02/2006 (pp. 51-60). , 1
Open this publication in new window or tab >>Economic lot scheduling problems with a time-varying facility cost
2006 (English)In: Proceedings, Igls 2006, 2006, Vol. 1, p. 51-60Conference paper, Published paper (Other academic)
National Category
Production Engineering, Human Work Science and Ergonomics
Research subject
Industrial Logistics
Identifiers
urn:nbn:se:ltu:diva-34951 (URN)94400ce0-766d-11db-962b-000ea68e967b (Local ID)94400ce0-766d-11db-962b-000ea68e967b (Archive number)94400ce0-766d-11db-962b-000ea68e967b (OAI)
Conference
International Working Seminar on Production Economics : 20/02/2006 - 24/02/2006
Note
Godkänd; 2006; 20061117 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-04-10Bibliographically approved
Brander, P. (2005). A heuristic for cyclic lot scheduling with sequence-dependent setups (ed.). In: (Ed.), Janny Leung (Ed.), Special issue for the 17th triennial conference of IFORS, Hawaii, July, 2005: the 17th triennial conference of the International Federation of Operational Research Societies, held in Honolulu, Hawaii from 11 to 15 July 2005. Paper presented at Triennial Conference of the International Federation of Operational Research Societies : 11/07/2005 - 15/07/2005. Oxford: Blackwell Munksgaard
Open this publication in new window or tab >>A heuristic for cyclic lot scheduling with sequence-dependent setups
2005 (English)In: Special issue for the 17th triennial conference of IFORS, Hawaii, July, 2005: the 17th triennial conference of the International Federation of Operational Research Societies, held in Honolulu, Hawaii from 11 to 15 July 2005 / [ed] Janny Leung, Oxford: Blackwell Munksgaard, 2005Conference paper, Published paper (Refereed)
Abstract [en]

We consider the problem of scheduling the production of multiple items on a single facility with constrained capacity. Only one item can be produced at a time, i.e. the Economic Lot Scheduling Problem. We assume sequence-dependent setups and present a heuristic for determination of cyclic schedules for this problem.

Place, publisher, year, edition, pages
Oxford: Blackwell Munksgaard, 2005
National Category
Production Engineering, Human Work Science and Ergonomics
Research subject
Industrial Logistics
Identifiers
urn:nbn:se:ltu:diva-34193 (URN)8525d110-0fa9-11dc-b9dd-000ea68e967b (Local ID)8525d110-0fa9-11dc-b9dd-000ea68e967b (Archive number)8525d110-0fa9-11dc-b9dd-000ea68e967b (OAI)
Conference
Triennial Conference of the International Federation of Operational Research Societies : 11/07/2005 - 15/07/2005
Note
Godkänd; 2005; 20070531 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Brander, P. (2005). Cyclic lot scheduling with sequence-dependent setups (ed.). In: (Ed.), Janny Leung (Ed.), Special issue for the 17th triennial conference of IFORS, Hawaii, July, 2005: : the 17th triennial conference of the International Federation of Operational Research Societies, held in Honolulu, Hawaii from 11 to 15 July 2005. Paper presented at Triennial Conference of the International Federation of Operational Research Societies : 11/07/2005 - 15/07/2005. Oxford: Blackwell Munksgaard
Open this publication in new window or tab >>Cyclic lot scheduling with sequence-dependent setups
2005 (English)In: Special issue for the 17th triennial conference of IFORS, Hawaii, July, 2005: : the 17th triennial conference of the International Federation of Operational Research Societies, held in Honolulu, Hawaii from 11 to 15 July 2005 / [ed] Janny Leung, Oxford: Blackwell Munksgaard, 2005Conference paper, Published paper (Refereed)
Abstract [en]

We consider the problem of scheduling the production of multiple items on a single facility with constrained capacity. Only one item can be produced at a time, i.e. the Economic Lot Scheduling Problem. We assume sequence-dependent setups and present a heuristic for determination of cyclic schedules for this problem.

Place, publisher, year, edition, pages
Oxford: Blackwell Munksgaard, 2005
National Category
Production Engineering, Human Work Science and Ergonomics
Research subject
Industrial Logistics
Identifiers
urn:nbn:se:ltu:diva-27315 (URN)0bacc4e0-77cb-11db-962b-000ea68e967b (Local ID)0bacc4e0-77cb-11db-962b-000ea68e967b (Archive number)0bacc4e0-77cb-11db-962b-000ea68e967b (OAI)
Conference
Triennial Conference of the International Federation of Operational Research Societies : 11/07/2005 - 15/07/2005
Note
Godkänd; 2005; 20061119 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Brander, P. & Forsberg, R. (2005). Cyclic lot scheduling with sequence-dependent set-ups: a heuristic for disassembly processes (ed.). Paper presented at . International Journal of Production Research, 43(2), 295-310
Open this publication in new window or tab >>Cyclic lot scheduling with sequence-dependent set-ups: a heuristic for disassembly processes
2005 (English)In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 43, no 2, p. 295-310Article in journal (Refereed) Published
Abstract [en]

The importance of material and product recovery is steadily increasing, mainly due to customer expectations and take-back obligations. Disassembly is a major operation in material and product recovery, since returned products are often disassembled to separate materials and components. The paper considers the problem of scheduling several items on a single disassembly facility. It develops a cyclic lot-scheduling heuristic for disassembly processes with sequence- dependent set-ups, resulting in disassembly frequencies for the items. Additionally, the way the problem is formulated allows calculation of the profitable use of the facility. The disassembly frequencies and the profitable use of the facility are used to create a cyclic schedule.

National Category
Production Engineering, Human Work Science and Ergonomics
Research subject
Industrial Logistics
Identifiers
urn:nbn:se:ltu:diva-2917 (URN)10.1080/0020754042000270403 (DOI)000226115800004 ()2-s2.0-27844498691 (Scopus ID)0a6693d0-77cc-11db-962b-000ea68e967b (Local ID)0a6693d0-77cc-11db-962b-000ea68e967b (Archive number)0a6693d0-77cc-11db-962b-000ea68e967b (OAI)
Note
Validerad; 2005; 20061117 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Brander, P. (2005). Inventory control and scheduling problems in a single-machine multi-item system (ed.). (Doctoral dissertation). Paper presented at . Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Inventory control and scheduling problems in a single-machine multi-item system
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This Doctoral Thesis addresses the topic of inventory control and scheduling in a single-machine multi-item system. Specifically, it considers a group of items processed, one at a time, on a single facility. Single-machine multi-item systems occur frequently in practice and apply both in continuous flow processes and batch flow processes. For instance, areas of applicability could include metal stamping, bottling, paper production, food processing, plastic extrusion, printing, and chemical batch production among others. In these cases, it is common to use cyclic schedules for the processing of items. The thesis contains an introductory part and five papers. Two papers present heuristics for determination of cyclic schedules assuming sequence- dependent setups. First, a reverse logistics system, where used products are disassembled, is considered. In this case, setup costs are assumed to be directly proportional to setup times. The heuristic results in disassembly frequencies, idle time, and the sequence in which the items should be processed. The second paper considers production settings and assumes setup costs not directly proportional to setup times. The heuristic presented in that paper also results in frequencies, idle time, and the sequence in which to process the items. These two papers assume deterministic environments. The remaining three papers consider stochastic environments and present planning and control models to be applied under these circumstances. One paper applies deterministic lot sizing models to stationary stochastic demands in a simulation study. A control model is also developed in the paper in order to make the decision for which item to produce and when to produce it. The remaining two papers present planning and control models for determination of safety stocks and order-up-to levels when items are produced in a fixed cyclic schedule. The models can be applied in environments with stochastic demands, stochastic operation times, and stochastic setup times or combinations thereof. The papers in this thesis can be combined in different ways and hence cover a variety of industries and practical applications. Practitioners in the area of production and inventory control would then get models for planning and controlling the processing of multiple items on a single facility. The models are preferably implemented in computerized Enterprise Resource Planning (ERP)-systems at manufacturing companies.

Abstract [sv]

Denna avhandling behandlar lagerstyrning vid samordnad beordring av olika produkter. Specifikt behandlas system där flertalet produkter hanteras i en och samma anläggning men endast en åt gången. Dessa system är vanligt förekommande i praktiken. Tillämpningsområden är exempelvis tillverkning av papper, plast och livsmedel liksom vid stansning, pressning, tryckning, paketering samt kemisk tillverkning. I sådana processer är det vanligt att använda cyklisk planering. Avhandlingen omfattar en inledande del och fem artiklar. Två av dessa utvecklar modeller för framtagande av cykliska scheman vid sekvensberoende omställningar. Den första artikeln behandlar ett system där returprodukter demonteras. I detta fall antas ställkostnaden vara proportionell mot ställtiden. Modellen resulterar i frekvenser, ledig tid samt sekvensen i vilken produkterna ska demonteras. Den andra artikeln behandlar produktion och antar att ställkostnaden inte är proportionell mot ställtiden. Modellen som presenteras resulterar även här i frekvenser, ledig tid samt sekvensen i vilken produkterna ska produceras. Dessa båda artiklar antar att miljön är deterministisk. De efterföljande tre artiklarna behandlar stokastiska miljöer och presenterar planerings- och styrningsmodeller att användas i sådana miljöer. En artikel testar deterministiska modeller för beräkning av orderkvantitieter vid stokastisk efterfrågan i en simuleringsstudie. Denna artikel utvecklar också en beslutsmodell för vilken produkt som ska tillverkas samt när den ska tillverkas. De återstående två artiklarna utvecklar modeller för bestämmande av säkerhetslager och beställa-upp-till nivåer när produkter tillverkas i en bestämd cyklisk sekvens. Modellerna kan användas när efterfrågan, operationstider och/eller ställtider är stokastiska. Artiklarna i denna avhandling kan kombineras på olika sätt och täcker då en mängd olika verksamheter och praktiska applikationer. Praktiker inom området för produktionsplanering och lagerstyrning får därmed modeller för planering och styrning av system där flertalet produkter hanteras i en och samma maskin. Modellerna implementeras förslagsvis i datoriserade affärssystem hos tillverkande företag.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2005
Series
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544 ; 2005:55
National Category
Production Engineering, Human Work Science and Ergonomics
Research subject
Industrial Logistics
Identifiers
urn:nbn:se:ltu:diva-17097 (URN)1946c410-5224-11db-9592-000ea68e967b (Local ID)1946c410-5224-11db-9592-000ea68e967b (Archive number)1946c410-5224-11db-9592-000ea68e967b (OAI)
Note
Godkänd; 2005; 20060930 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved
Brander, P., Levén, E. & Segerstedt, A. (2005). Lot sizes in a capacity constrained facility: a simulation study of stationary stochastic demand (ed.). Paper presented at . International Journal of Production Economics, 93-94(Spec. issue), 375-386
Open this publication in new window or tab >>Lot sizes in a capacity constrained facility: a simulation study of stationary stochastic demand
2005 (English)In: International Journal of Production Economics, ISSN 0925-5273, E-ISSN 1873-7579, Vol. 93-94, no Spec. issue, p. 375-386Article in journal (Refereed) Published
Abstract [en]

This paper considers the scheduling of several different items on a single machine, in literature known as the economic lot scheduling problem, ELSP. One of the characteristics of this problem is that the demand rate is deterministic and constant. However, in a practical situation demand usually varies. In this paper we examine if a deterministic model can be used if demand is stationary stochastic. A dynamic programming approach from Bomberger (Manage. Sci. 12(11) (1966) 778) and a heuristic method from Segerstedt (Int. J. Production Econom. 59(1–3) (1999) 469) are used to calculate lot sizes for four items. The production of these items is simulated with different variations in demand rates. Our conclusion is that a deterministic model of this kind can be used in a practical situation where the demand rate is stationary stochastic, but the models must be complemented by a decision rule; which item to produce and when to produce it. In our tests the heuristic method and the dynamic programming approach perform rather similarly with respect to costs and inventory levels, but the dynamic programming approach results in more backorders when there is small variation in demand rates. This study indicates that the model used for determination of lot sizes is of less importance than the decision rule used for identification of the item to produce and when to produce it.

National Category
Production Engineering, Human Work Science and Ergonomics
Research subject
Industrial Logistics
Identifiers
urn:nbn:se:ltu:diva-15966 (URN)10.1016/j.ijpe.2004.06.034 (DOI)000225423600036 ()2-s2.0-9544253909 (Scopus ID)f8d59f70-7637-11db-962b-000ea68e967b (Local ID)f8d59f70-7637-11db-962b-000ea68e967b (Archive number)f8d59f70-7637-11db-962b-000ea68e967b (OAI)
Note
Validerad; 2005; Bibliografisk uppgift: Proceedings of the Twelfth International Symposium on Inventories; 20061117 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
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