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Segerstedt, A. & Levén, E. (2023). A Study of Different Croston-Like Forecasting Methods. Operations and Supply Chain Management, 16(3), 413-423
Open this publication in new window or tab >>A Study of Different Croston-Like Forecasting Methods
2023 (English)In: Operations and Supply Chain Management, ISSN 1979-3561, Vol. 16, no 3, p. 413-423Article in journal (Refereed) Published
Place, publisher, year, edition, pages
OSCM, 2023
National Category
Production Engineering, Human Work Science and Ergonomics
Research subject
Quality Technology and Logistics
Identifiers
urn:nbn:se:ltu:diva-102642 (URN)10.31387/oscm0540400 (DOI)2-s2.0-85174798427 (Scopus ID)
Note

Validerad;2023;Nivå 2;2023-11-21 (hanlid)

Available from: 2023-11-21 Created: 2023-11-21 Last updated: 2023-11-21Bibliographically approved
Segerstedt, A., Abdul-Jalbar, B. & Samuelsson, B. (2023). Reformulated Silver-Meal and Similar Lot Sizing Techniques. AXIOMS, 12(7), Article ID 661.
Open this publication in new window or tab >>Reformulated Silver-Meal and Similar Lot Sizing Techniques
2023 (English)In: AXIOMS, ISSN 2075-1680, Vol. 12, no 7, article id 661Article in journal (Refereed) Published
Abstract [en]

Literature and most textbooks around the world describe Silver-Meal in such a way that periods with zero demand make Silver-Meal suggest a higher frequency of order replenishments than necessary and therefore higher total costs than necessary. Silver-Meal, still the best-known technique, is therefore inferior to other lesser-known techniques when the time interval in the calculations presently is days and not months. The purpose of this article is to show that another mathematical formulation of Silver-Meal avoids this trouble. We also point to characteristics such as Silver-Meal, Least Unit Cost, Part-Period Balancing, and lot-sizing techniques that are available in many textbooks for operations and supply chain management. We illustrate the techniques with different examples of periods without demand, declining demand, and varying demand. We point out possible problems with the different techniques. Literature mostly does not consider periods of zero demand, which was not so important before. Lot-sizing methods must cope with the important performance indicator “Days of inventory”. Numerous practical situations with zero demand periods exist where a lot of sizing techniques help for efficient operations. It is necessary knowledge and a tool for students (future users, performers, and managers). “Lägsta periodkostnad” is a restored and reformulated Silver-Meal, with Silver-Meal’s characteristics already presented in literature, except those difficulties with zero demand periods disappear.

Place, publisher, year, edition, pages
MDPI, 2023
Keywords
lot sizing, Silver-Meal, Least Unit Cost, Part-Period Balancing, education
National Category
Other Engineering and Technologies not elsewhere specified
Research subject
Quality Technology and Logistics
Identifiers
urn:nbn:se:ltu:diva-99512 (URN)10.3390/axioms12070661 (DOI)001034836800001 ()
Note

Validerad;2023;Nivå 2;2023-08-11 (joosat);

Licens fulltext: CC BY License

Available from: 2023-08-11 Created: 2023-08-11 Last updated: 2023-08-11Bibliographically approved
Liu, B., Chen, T., Yang, H. & Segerstedt, A. (2023). Supplier evaluation and selection in a sustainable supply chain based on fuzzy-BWM, entropy method and grey relational TOPSIS. Journal of Intelligent & Fuzzy Systems, 44(6), 9919-9932
Open this publication in new window or tab >>Supplier evaluation and selection in a sustainable supply chain based on fuzzy-BWM, entropy method and grey relational TOPSIS
2023 (English)In: Journal of Intelligent & Fuzzy Systems, ISSN 1064-1246, E-ISSN 1875-8967, Vol. 44, no 6, p. 9919-9932Article in journal (Refereed) Published
Abstract [en]

Suppliers significantly affect the effectiveness of sustainable supply chain management. Hence, it is extremely important to evaluate and select suppliers scientifically and objectively. Based on the theory of triple bottom line (economic, social, and environmental dimension) and a balanced scorecard, a measureable supplier evaluation framework in a sustainable supply chain is first formulated. Second, to reduce the defects of the single weight method, the subjective and objective weights of evaluation indicators are determined by combining the fuzzy best-worst method (BWM) and the entropy method, and then the combination weights are obtained through linear weighting. Third, the grey relational technique for order performance by similarity to ideal solution (TOPSIS) method is further adopted to evaluate and rank the suppliers. Finally, a case study illustrates and demonstrates the availability of the proposed supplier evaluation index system and evaluation method. Subsequently, some suggestions are proposed according to the results.

Place, publisher, year, edition, pages
Ios Press, 2023
Keywords
Sustainable supply chain management, supplier evaluation, the fuzzy BWM, grey relational, TOPSIS
National Category
Production Engineering, Human Work Science and Ergonomics Other Mechanical Engineering
Research subject
Quality Technology and Logistics
Identifiers
urn:nbn:se:ltu:diva-99291 (URN)10.3233/JIFS-212996 (DOI)001004176300069 ()2-s2.0-85166674216 (Scopus ID)
Note

Validerad;2023;Nivå 2;2023-08-10 (joosat);

Funder: National Natural Science Foundation of China (Nos.71971064 and 71801045); Social Science Foundation of Fujian Province (No. FJ2022B071); National Natural Science Foundation of Fujian Province (No. 2020J01460)

Available from: 2023-08-10 Created: 2023-08-10 Last updated: 2023-10-11Bibliographically approved
Tadaros, M., Migdalas, A., Samuelsson, B. & Segerstedt, A. (2022). Location of facilities and network design for reverse logistics of lithium-ion batteries in Sweden. Operational Research, 22(2), 895-915
Open this publication in new window or tab >>Location of facilities and network design for reverse logistics of lithium-ion batteries in Sweden
2022 (English)In: Operational Research, ISSN 1109-2858, E-ISSN 1866-1505, Vol. 22, no 2, p. 895-915Article in journal (Refereed) Published
Abstract [en]

Estimations of the amount of lithium-ion batteries reaching their end-of-life in 2025 and the amount being recycled indicates large deviations. To enable an efficient recycling process a well-defined and efficient supply chain network for the recovery of discarded lithium-ion batteries must be put in place. This includes analyzing the needs and restrictions of such a network. The aim of this paper is to provide decision support tools, to analyze input, and optimize a future supply chain for discarded lithium-ion batteries. A mixed integer programming model is developed and applied to the Swedish market. The findings show that several aspects will affect a reverse supply chain for discarded lithium-ion batteries, many of which are still uncertain and hard to predict.

Place, publisher, year, edition, pages
Springer, 2022
National Category
Reliability and Maintenance
Research subject
Quality technology and logistics
Identifiers
urn:nbn:se:ltu:diva-80590 (URN)10.1007/s12351-020-00586-2 (DOI)000559374300001 ()2-s2.0-85089289548 (Scopus ID)
Funder
Swedish Energy Agency, 45521-1Luleå University of Technology
Note

Validerad;2022;Nivå 2;2022-04-13 (sofila)

Available from: 2020-08-27 Created: 2020-08-27 Last updated: 2023-10-06Bibliographically approved
Liu, B., Wang, Y., Yang, H., Segerstedt, A. & Zhang, L. (2021). Maintenance service strategy for leased equipment: integrating lessor-preventive maintenance and lessee-careful protection efforts. Computers & industrial engineering, 156, Article ID 107257.
Open this publication in new window or tab >>Maintenance service strategy for leased equipment: integrating lessor-preventive maintenance and lessee-careful protection efforts
Show others...
2021 (English)In: Computers & industrial engineering, ISSN 0360-8352, E-ISSN 1879-0550, Vol. 156, article id 107257Article in journal (Refereed) Published
Abstract [en]

Lessees may abuse equipment during the lease period since lacking of ownership, thereby increasing lessors’ repair cost and lessees’ downtime losses. This study integrates lessees’ effort to protect leased equipment during the lease period with lessors’ preventive maintenance (PM) into maintenance service strategies. It is proved in a non-cooperative game, neither party achieves the cooperative game’s ideal revenue, but improvement in the lessee’s effort level and lessor’s PM degree can increase the other party’s revenue. A cost-sharing contract model is designed to achieve the maximum revenue as in a cooperative game and ensure Pareto improvement of the leasing parties. In the contract, the lessor grants the lessee a rental discount, and the lessor’s PM cost and lessee’s effort cost are shared with cost-sharing coefficients. Conditions under which the ideal revenue and Pareto improvement can be achieved are discussed. Numerical examples are provided to illustrate the effects of contract parameters, unit penalty on the effort level, and revenue. Managerial insights are finally proposed for leasing parties. The results show: the effect of the effort level and PM degree on equipment failures is marginally diminishing; proposed cost-sharing contract model can achieve the ideal revenue and Pareto improvement; the rental discount has a greater impact on the lessee, while the cost-sharing coefficients have a greater impact on the lessor; and increasing the unit penalty decreases (increases) the lessor’s (lessee’s) revenue but maintains the effort level at constant.

Place, publisher, year, edition, pages
Elsevier, 2021
Keywords
Maintenance service, Leasing, Cost-sharing contract, Effort level, Preventive maintenance
National Category
Business Administration
Research subject
Quality technology and logistics
Identifiers
urn:nbn:se:ltu:diva-83404 (URN)10.1016/j.cie.2021.107257 (DOI)000647845400036 ()2-s2.0-85103651092 (Scopus ID)
Note

Validerad;2021;Nivå 2;2021-04-19 (johcin)

Available from: 2021-03-25 Created: 2021-03-25 Last updated: 2021-06-01Bibliographically approved
Segerstedt, A. (2021). Produktion i ett flöde, om CONWIP, Täcktidsplanering m.m.. In: : . Paper presented at Forsknings- och tillämpningskonferensen 2021, DIGITAL, 21 oktober, 2021.. Logistikföreningen Plan
Open this publication in new window or tab >>Produktion i ett flöde, om CONWIP, Täcktidsplanering m.m.
2021 (Swedish)Conference paper, Published paper (Other academic)
Place, publisher, year, edition, pages
Logistikföreningen Plan, 2021
National Category
Transport Systems and Logistics
Research subject
Quality technology and logistics
Identifiers
urn:nbn:se:ltu:diva-89118 (URN)
Conference
Forsknings- och tillämpningskonferensen 2021, DIGITAL, 21 oktober, 2021.
Available from: 2022-02-07 Created: 2022-02-07 Last updated: 2022-02-07Bibliographically approved
Segerstedt, A. & Levén, E. (2020). A study of different Croston-like forecasting methods (ed.). Luleå
Open this publication in new window or tab >>A study of different Croston-like forecasting methods
2020 (English)Report (Other academic)
Abstract [en]

An often-adopted technique for short-term forecasting is the single exponential smoothing (SES); it is available in most computer systems for material- and production control. With help from it, it is possible to update continually reorder points for an efficient inventory control. However, the ability for SES to forecast an item when the forecasting time periods often have zero demand is questioned; i.e. slow moving items or when demand is intermittent. Croston presented an idea and method to separate ordinary exponential smoothing in to two parts; the time between demand (withdrawals), and demand size. The forecasts then update only when there is a demand. Since then modifications of Croston’s idea have been suggested and also an idea to measure the fraction of periods with zero demand compared to non-zero demand, i.e. techniques to handle intermittent demand. From the beginning four different suggestions to treat intermittent demand are tested. The tests showed that some complementary modifications were interesting to investigate. The different techniques are compared with Mean Squared Error (MSE), Cumulated Forecast Error (CFE) and with a new bias measure “Periods in Stock” (PIS). Our tests show that Croston’s original idea may be to prefer; some techniques overestimate and others underestimate demand in certain circumstances; and one technique is not to prefer at all.

Place, publisher, year, edition, pages
Luleå: , 2020. p. 19
Keywords
Forecasting, Inventory control, Intermittent demand, Croston, Exponential smoothing
National Category
Reliability and Maintenance Production Engineering, Human Work Science and Ergonomics
Research subject
Quality technology and logistics
Identifiers
urn:nbn:se:ltu:diva-78088 (URN)
Note

This is a revised version of the 2014 publication with the same title. Found here: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-24548

Available from: 2020-03-17 Created: 2020-03-17 Last updated: 2020-03-18Bibliographically approved
Segerstedt, A. (2020). En inledning till den bästa förklaringen: Liten handbok för uppsats- och examensarbete.
Open this publication in new window or tab >>En inledning till den bästa förklaringen: Liten handbok för uppsats- och examensarbete
2020 (Swedish)Manuscript (preprint) (Other academic)
Publisher
p. 31
National Category
Pedagogy
Research subject
Quality technology and logistics
Identifiers
urn:nbn:se:ltu:diva-81119 (URN)
Available from: 2020-10-13 Created: 2020-10-13 Last updated: 2021-09-14
Segerstedt, A. (2020). Lager och PIA en nödvändighet. Dagens logistik (2), 22
Open this publication in new window or tab >>Lager och PIA en nödvändighet
2020 (English)In: Dagens logistik, ISSN 2003-5713, no 2, p. 22-Article in journal, Editorial material (Other academic) Published
Place, publisher, year, edition, pages
Hultén Media AB, 2020
National Category
Reliability and Maintenance
Research subject
Quality technology and logistics
Identifiers
urn:nbn:se:ltu:diva-80146 (URN)
Note

Godkänd;2020;Nivå 0;2020-07-02 (alebob)

Available from: 2020-07-02 Created: 2020-07-02 Last updated: 2020-07-02Bibliographically approved
Segerstedt, A. (2020). Nödvändigt: Lager och produkter i arbete.
Open this publication in new window or tab >>Nödvändigt: Lager och produkter i arbete
2020 (Swedish)Manuscript (preprint) (Other academic)
National Category
Reliability and Maintenance
Research subject
Quality technology and logistics
Identifiers
urn:nbn:se:ltu:diva-79018 (URN)
Available from: 2020-05-27 Created: 2020-05-27 Last updated: 2020-06-09
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-1173-6713

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