| 1. |
- Liu, Biyu, et al.
(författare)
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Supplier evaluation and selection in a sustainable supply chain based on fuzzy-BWM, entropy method and grey relational TOPSIS
- 2023
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Ingår i: Journal of Intelligent & Fuzzy Systems. - : IOS Press. - 1064-1246 .- 1875-8967. ; 44:6, s. 9919-9932
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Tidskriftsartikel (refereegranskat)abstract
- 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.
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| 2. |
- Liu, Biyu, et al.
(författare)
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A min–max solution to optimise planned lead time in a remanufacturing system
- 2019
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Ingår i: International Transactions in Operational Research. - : John Wiley & Sons. - 0969-6016 .- 1475-3995. ; 26:2, s. 485-506
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Tidskriftsartikel (refereegranskat)abstract
- Determining a rational planned lead time (PLT) is a critical and difficult problem in production planning, especially for a remanufacturing system. This paper considers an optimisation problem of the PLT in a make-to-order remanufacturing system to coordinate disassembly–remanufacturing–reassembly and to improve performance. This optimisation model is designed to determine the PLT that minimises the inventory holding and shortage costs. Given the unknown distribution of remanufacturing time but with known first and second moments, this model is solved by a min–max approach, which can capture distributions with the same first and second moments. How the PLT and total cost are affected by yield rate with different first and second moments, unit holding cost, unit shortage cost and purchasing lead time are also investigated through numerical examples in this paper. The results of this study are shown to be consistent with practice and can be a support to decision-making in production planning and scheduling for remanufacturing.
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| 3. |
- Segerstedt, Anders, et al.
(författare)
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A study of different Croston-like forecasting methods
- 2020
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- 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.
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| 4. |
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| 5. |
- Segerstedt, Anders
(författare)
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El är inte enda vägen framåt för fordon
- 2018
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Ingår i: Vestmanlands Läns Tidning (Vlt). - Västerås : Daniel Nordström. ; 16 november
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Tidskriftsartikel (populärvet., debatt m.m.)
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| 6. |
- Segerstedt, Anders
(författare)
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Lager och PIA en nödvändighet
- 2020
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Ingår i: Dagens logistik. - : Hultén Media AB. - 2003-5713. ; :2, s. 22-
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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| 7. |
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| 8. |
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| 9. |
- Tadaros, Marduch, et al.
(författare)
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Location of facilities and network design for reverse logistics of lithium-ion batteries in Sweden
- 2022
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Ingår i: Operational Research. - : Springer. - 1109-2858 .- 1866-1505. ; 22:2, s. 895-915
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Tidskriftsartikel (refereegranskat)abstract
- 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.
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| 10. |
- Abdul-Jalbar, Beatriz, et al.
(författare)
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A new heuristic to solve the one-warehouse N-retailer problem
- 2010
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Ingår i: Computers & Operations Research. - : Elsevier BV. - 0305-0548 .- 1873-765X. ; 37:2, s. 265-272
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Tidskriftsartikel (refereegranskat)abstract
- We deal with a multi-echelon inventory system in which one warehouse supplies an item to multiple retailers. Customer demand arrives at each retailer at a constant rate. The retailers replenish their inventories from the warehouse that in turn orders from an outside supplier. It is assumed that shortages are not allowed and lead times are negligible. The goal is to determine replenishment policies that minimize the overall cost in the system. We develop a heuristic to compute efficient policies, which also can easily be used in a spreadsheet application. The main idea consists of finding a balance between the replenishment and the inventory holding costs at each installation. This new heuristic we compare with two other approaches proposed in the literature; the computational studies show that in most of the instances generated the new method provides lower costs.
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