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Zhang, Q., Zhang, D., Segerstedt, A. & Luo, J. (2018). Optimal ordering and pricing decisions for a company issuing product-specific gift cards. Omega: The International Journal of Management Science, 74, 92-102
Open this publication in new window or tab >>Optimal ordering and pricing decisions for a company issuing product-specific gift cards
2018 (English)In: Omega: The International Journal of Management Science, ISSN 0305-0483, E-ISSN 1873-5274, Vol. 74, p. 92-102Article in journal (Refereed) Published
Abstract [en]

In this paper, we investigate gift card's influence on retailers’ ordering decisions and analyse the benefits of issuing product-specific gift cards. We propose an optimal ordering model for retailers’ decision problems with gift cards being issued. We also solve the problem with the analytical forms of optimal order quantities and expected profits. By comparing the results with the classical newsvendor problem, we classify the benefits of issuing gift cards into three categories: (1) the demand stimulating; (2) the pre-payment, and (3) the non-redemption. We step further to explore a retailer's problem on how to determine the optimal discount for gift cards, which is characterized by a joint optimal policy on the ordering quantity and the discount. We derive the optimal condition on this joint policy. Numerical examples are conducted to illustrate the model results and analyse the influences of parameters. A sample average approximation method is also been introduced to solve the optimization model.

Place, publisher, year, edition, pages
Elsevier, 2018
National Category
Production Engineering, Human Work Science and Ergonomics
Research subject
Industrial Logistics
Identifiers
urn:nbn:se:ltu:diva-61849 (URN)10.1016/j.omega.2017.01.009 (DOI)000414884100009 ()2-s2.0-85012885194 (Scopus ID)
Note

Validerad;2017;Nivå 2;2017-11-13 (rokbeg)

Available from: 2017-02-07 Created: 2017-02-07 Last updated: 2018-04-10Bibliographically approved
Segerstedt, A. (2017). Cover-Time Planning/Takt Planning: A technique for Materials Requirement and Production Planning. International Journal of Production Economics, 194, 25-31
Open this publication in new window or tab >>Cover-Time Planning/Takt Planning: A technique for Materials Requirement and Production Planning
2017 (English)In: International Journal of Production Economics, ISSN 0925-5273, E-ISSN 1873-7579, Vol. 194, p. 25-31Article in journal (Refereed) Published
Abstract [en]

Cover-Time Planning, or Takt Planning, is presented. It is a system for calculating material requirements and start of purchases and production. Requested production rates of sales items, or alternative prefabricated modules in stock, are “broken down”, exploded, to create the need for components, for all underlying items (articles) in the Bill of Material. Inventory and already ordered replenishments are compared with the item's desired production rate. How long already made actions are expected to cover the desired expected sales and production rates is compared with the item's lead time; if a forward future shortage is likely the article is signalled for a refill. With examples is described how make-to-order production is done easily. The method is a type of reorder point system, but with time instead of quantity as decision variable. Unlike a traditional reorder point system increases and decreases of production can be planned. Future work load in various production sections can be estimated. It is described how an “Available-to-promise”-system should be designed and used. Cover-Time Planning (CTP) is a complete alternative to Materials Requirements Planning (MRP). CTP responds faster than MRP, since MRP for each structural level uses a batch size to "break down" and to magnify the need at the underlying level. In the end a large material acquisition needs to be ordered maybe just to build a single end item. CTP uses the end item requirement rates on all structural levels shifted with the lead times, when customer demand changes, the entire production chain react simultaneously

Place, publisher, year, edition, pages
Elsevier, 2017
National Category
Production Engineering, Human Work Science and Ergonomics
Research subject
Industrial Logistics
Identifiers
urn:nbn:se:ltu:diva-63049 (URN)10.1016/j.ijpe.2017.04.006 (DOI)000419413100004 ()
Note

Validerad;2018;Nivå 2;2017-12-15 (andbra)

Available from: 2017-04-18 Created: 2017-04-18 Last updated: 2018-04-10Bibliographically approved
Abrahamsson, L., Bengtsson, L., Gremyr, I., Kowalkowski, C., Nilsson, A., Rehn, A., . . . Öhman, P. (2016). Industriell ekonomi och organisering: IE. Paper presented at . Stockholm: Liber
Open this publication in new window or tab >>Industriell ekonomi och organisering: IE
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2016 (Swedish)Book (Refereed)
Place, publisher, year, edition, pages
Stockholm: Liber, 2016. p. 559
Keywords
Business / Economics - Business studies, Ekonomi - Företagsekonomi
National Category
Production Engineering, Human Work Science and Ergonomics Business Administration
Research subject
Gender and Technology; Accounting and Control; Industrial Logistics
Identifiers
urn:nbn:se:ltu:diva-16421 (URN)18116925-741e-48bd-9197-63958f7f23a8 (Local ID)9789147111831 (ISBN)18116925-741e-48bd-9197-63958f7f23a8 (Archive number)18116925-741e-48bd-9197-63958f7f23a8 (OAI)
Note

Godkänd; 2016; 20150410 (andersn)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-05-16Bibliographically approved
(2015). Artiklar från Plan:s forsknings och tillämpningskonferens/Workshop: 27-28 augusti 2015 vid Luleå tekniska universitet (ed.). Paper presented at . Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Artiklar från Plan:s forsknings och tillämpningskonferens/Workshop: 27-28 augusti 2015 vid Luleå tekniska universitet
2015 (Swedish)Report (Refereed)
Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2015. p. 57
National Category
Production Engineering, Human Work Science and Ergonomics
Research subject
Industrial Logistics
Identifiers
urn:nbn:se:ltu:diva-21821 (URN)059c7e4f-f2b9-437d-b244-22627315f213 (Local ID)059c7e4f-f2b9-437d-b244-22627315f213 (Archive number)059c7e4f-f2b9-437d-b244-22627315f213 (OAI)
Note

Godkänd; 2015; Bibliografisk uppgift: Program PLAN:s Forsknings- och Tillämpningskonferens i Logistik 27-28 augusti 2015, Luleå tekniska universitet, Luleå; 20151104 (andbra)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-01-03Bibliographically approved
Liu, B., Holmbom, M., Segerstedt, A. & Chen, W. (2015). Effects of carbon emission regulations on remanufacturing decisions with limited information of demand distribution (ed.). Paper presented at . International Journal of Production Research, 53(2), 532-548
Open this publication in new window or tab >>Effects of carbon emission regulations on remanufacturing decisions with limited information of demand distribution
2015 (English)In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 53, no 2, p. 532-548Article in journal (Refereed) Published
Abstract [en]

Policy-makers are developing regulation policies to drive down carbon emissions from industries. Independent remanufacturers (IRs), which remanufacture recycled products/components/parts, must manage and evaluate economic costs generated by the production under future carbon emission regulations. We present three optimisation models to determine the remanufacturing quantity that maximises the total profits under three common carbon emission regulation policies: (a) mandatory carbon emissions capacity, (b) carbon tax and (c) cap and trade. These models include sales revenue, remanufacturing cost, disposal cost, inventory holding cost, shortage cost and carbon emission cost. The max–min approach is used to solve the models, which assume limited information on demand distribution. We investigate how the three regulation policies affect remanufacturing decision-making for IRs and we also solve some numerical examples where we vary the magnitudes of incentives, penalties and stringency of constraints to provide implications to policy-makers. The results indicate that remanufacturers should aim to improve yield rate to maximise the profit irrespective of the implemented carbon emissions policy. Policy-makers should prefer the carbon tax policy, if any of the other two policies must be performed, a remanufacturing discount such as a higher carbon emission cap or lower penalty should be implemented to better promote the development of remanufacturers.

National Category
Production Engineering, Human Work Science and Ergonomics
Research subject
Industrial Logistics
Identifiers
urn:nbn:se:ltu:diva-9235 (URN)10.1080/00207543.2014.957875 (DOI)000345001500012 ()2-s2.0-84911488096 (Scopus ID)7cce2425-1fe8-40c3-9f14-49dc3dae8b51 (Local ID)7cce2425-1fe8-40c3-9f14-49dc3dae8b51 (Archive number)7cce2425-1fe8-40c3-9f14-49dc3dae8b51 (OAI)
Note
Validerad; 2015; Nivå 2; 20140912 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Segerstedt, A. (2015). Har byggindustrin en annan logistik? (ed.). Paper presented at . Bättre produktivitet : tidning för PLAN och regionala produktivitetsföreningar : med plan-nytt (4), 18-20
Open this publication in new window or tab >>Har byggindustrin en annan logistik?
2015 (Swedish)In: Bättre produktivitet : tidning för PLAN och regionala produktivitetsföreningar : med plan-nytt, ISSN 1402-1145, no 4, p. 18-20Article in journal (Other (popular science, discussion, etc.)) Published
National Category
Production Engineering, Human Work Science and Ergonomics
Research subject
Industrial Logistics
Identifiers
urn:nbn:se:ltu:diva-8101 (URN)68d85664-6da5-4c57-b4be-7f51363bfc1e (Local ID)68d85664-6da5-4c57-b4be-7f51363bfc1e (Archive number)68d85664-6da5-4c57-b4be-7f51363bfc1e (OAI)
Note
Godkänd; 2015; 20150915 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-04-10Bibliographically approved
Zhang, Q., Segerstedt, A., Tsao, Y.-C. & Liu, B. (2015). Returnable packaging management in automotive parts logistics: dedicated mode and shared mode (ed.). Paper presented at . International Journal of Production Economics, 168, 234-244
Open this publication in new window or tab >>Returnable packaging management in automotive parts logistics: dedicated mode and shared mode
2015 (English)In: International Journal of Production Economics, ISSN 0925-5273, E-ISSN 1873-7579, Vol. 168, p. 234-244Article in journal (Refereed) Published
Abstract [en]

We compare two different modes, i.e., dedicated mode and shared mode, used in packaging management in automotive parts logistics. In dedicated mode, every parts supplier uses his own packaging; while in shared mode, packages can be shared among the suppliers. For each mode, we calculate the total costs consisting of transportation cost and inventory holding cost, and prove that the total costs, the transportation cost and the inventory holding cost are all smaller under shared mode. We further illustrate the factors that influence the cost savings of shared mode, i.e., the total cost of dedicated mode minus that of shared mode. In particular, the cost savings are proved to be negatively related to the number of package categories, and are positively related to: (1) the demand gap of packages between areas, i.e., sum of the volume difference of every kind of packages that transported in and out of one area; (2) the failed ratio factor of the returned packages, i.e., the ratio of the packages that cannot be returned to the supplier because of broken, pilferage, misplace, etc.; and (3) the time savings of short distance transportation, i.e., the transportation time consumed between areas minus the transportation time within one area. Finally, numerical examples show that the cost savings can be considerable, and the number of package categories is the most important influence factor.

National Category
Production Engineering, Human Work Science and Ergonomics
Research subject
Industrial Logistics
Identifiers
urn:nbn:se:ltu:diva-12677 (URN)10.1016/j.ijpe.2015.07.002 (DOI)000361261000020 ()2-s2.0-84940028482 (Scopus ID)bd7b49b5-24b2-44e5-a4f6-76b2c5ed0375 (Local ID)bd7b49b5-24b2-44e5-a4f6-76b2c5ed0375 (Archive number)bd7b49b5-24b2-44e5-a4f6-76b2c5ed0375 (OAI)
Note
Validerad; 2015; Nivå 2; 20150715 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Segerstedt, A. (2015). Täcktidsplanering/Taktplanering (ed.). Paper presented at . Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Täcktidsplanering/Taktplanering
2015 (Swedish)Report (Other academic)
Abstract [en]

Täcktidsplanering, ett system för att beräkna materialbehov och starta upp inköp och produktion, presenteras. Önskade produktionstakter av försäljningsartiklar eller lagerförda moduler bryts ned och skapar behov av komponenter, för alla underliggande artiklar. Lagersaldo och redan beställda påfyll-ningar jämförs med artikelns önskade produktionstakt. Hur länge redan gjorda åtgärder förväntas täcka önskad prognoserad försäljnings- eller produktionstakt jämförs med artikelns ledtid, ifall fram-tida brist kan befaras signaleras artikeln för påfyllnad. Hur produktion mot kundorder kan utföras ges exempel på. Metoden är en typ av beställningspunktsystem, men med tid istället för kvantitet som beslutsvariabel. Till skillnad mot ett traditionellt beställningspunktsystem kan uppgångar och ned-gångar av produktion planeras samt underlag för beläggningsberäkning (timmar i olika produktions-avsnitt) erhållas. Täcktidsplanering är därmed ett komplett alternativ till nettobehovsplanering. Täck-tidsplanering regerar snabbare än nettobehovsplanering, då nettobehovsplaneringen för varje struk-turnivå har en batchstorlek som ”pressar ned” och förstorar behovet på underliggande nivå. Till slut finns ett stort materialanskaffningsbehov för att kanske bygga en enda slutartikel. Vid täcktidsplane-ring använder man slutartiklarnas behovstakt på alla strukturnivåer, när kundbehoven förändras kan hela produktionskedjan reagera samtidigt.1.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2015. p. 13
National Category
Production Engineering, Human Work Science and Ergonomics
Research subject
Industrial Logistics
Identifiers
urn:nbn:se:ltu:diva-22837 (URN)47cb1fa4-e0e1-47c0-8fb9-57773ee2b04c (Local ID)47cb1fa4-e0e1-47c0-8fb9-57773ee2b04c (Archive number)47cb1fa4-e0e1-47c0-8fb9-57773ee2b04c (OAI)
Note

Godkänd; 2015; 20151104 (andbra)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-04-10Bibliographically approved
Segerstedt, A. (2014). A simple heuristic for vehicle routing: A variant of Clarke and Wright’s saving method (ed.). Paper presented at International Symposium on Inventories : 20/08/2012 - 24/08/2012. International Journal of Production Economics, 157(S1), 74-79
Open this publication in new window or tab >>A simple heuristic for vehicle routing: A variant of Clarke and Wright’s saving method
2014 (English)In: International Journal of Production Economics, ISSN 0925-5273, E-ISSN 1873-7579, Vol. 157, no S1, p. 74-79Article in journal (Refereed) Published
Abstract [en]

Efficient collection and distribution of items are important because fewer resources and less energy would be used and this would help the world to be more sustainable. Many goods are always in transit. Efficient collection from storage racks and depots, and efficient distribution to retailers and customers, etc., will decrease transport inventories. The paper presents a variant of the Clarke and Wright’s saving method that is suitable for introducing the vehicle routing problem and the importance of efficient vehicle routing. The method uses only the first pair of calculated savings and uses these also when searching for complements or additions to an already decided route. The variant is simple, very fast and finds the best known solution to the Dantzig and Ramser (1959)–problem.

National Category
Production Engineering, Human Work Science and Ergonomics
Research subject
Industrial Logistics
Identifiers
urn:nbn:se:ltu:diva-38279 (URN)10.1016/j.ijpe.2013.09.017 (DOI)000345734100010 ()2-s2.0-84922592786 (Scopus ID)c9fcda5e-844b-4fc1-b421-c75cf064db82 (Local ID)c9fcda5e-844b-4fc1-b421-c75cf064db82 (Archive number)c9fcda5e-844b-4fc1-b421-c75cf064db82 (OAI)
Conference
International Symposium on Inventories : 20/08/2012 - 24/08/2012
Note
Validerad; 2014; 20131010 (andbra); Konferensartikel i tidskriftAvailable from: 2016-10-03 Created: 2016-10-03 Last updated: 2018-07-10Bibliographically approved
Segerstedt, A. & Levén, E. (2014). A study of different Croston-like forecasting methods (ed.). Paper presented at . Luleå
Open this publication in new window or tab >>A study of different Croston-like forecasting methods
2014 (English)Report (Other academic)
Abstract [en]

Croston (1972) presented an idea and method to separate ordinary exponential smoothing in two parts; in the time between demand, or withdrawals, and demand size. The forecasts are then updated only when there is a demand. Syntetos and Boylan (2005) recommended an adjustment of the Croston method due to a systematic error notified by Syntetos and Boylan (2001). Levén and Segerstedt (2004) suggested a modification of the Croston method where a demand rate is directly calculated when a demand has happened. In this paper real demand data is used to compare these variants of the Croston method. The idea with the modification of Levén and Segerstedt (2004) is that time between demand and demand size is not independent. But this modification has shown poor results. Therefore Wallström and Segerstedt (2010) suggest another modification, a “forward coverage” different to the previous “backward coverage”. Teunter et al (2011) suggest another method, a combination of updates every time period, for estimating the probability of a demand occasion, and every time a demand occurs for estimating demand size. All these different techniques are tested here. The different tech-niques are compared with Mean Squared Error (MSE), Cumulated Forecast Error (CFE) and with the new bias measure “Periods in Stock” (PIS). The tests show that modified Croston with “forward cover-age” in most cases seems to be to prefer compared to “backward coverage”, but still it overestimates demand. Ordinary Croston may be to prefer; therefore our tests show that Croston according to Syntetos and Boylan and also Teunter et al show a tendency to underestimate demand.

Place, publisher, year, edition, pages
Luleå: , 2014. p. 18
National Category
Production Engineering, Human Work Science and Ergonomics
Research subject
Industrial Logistics
Identifiers
urn:nbn:se:ltu:diva-24548 (URN)b690cae1-d468-4566-b375-db8c5dfe106a (Local ID)b690cae1-d468-4566-b375-db8c5dfe106a (Archive number)b690cae1-d468-4566-b375-db8c5dfe106a (OAI)
Note
Godkänd; 2014; 20140206 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-04-10Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-1173-6713

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