• No results found

Steg 5: Om problemet med begränsningen eller begränsningarna är lösta kommer

5 Diskussion och slutsatser

5.5 Vidare forskning

Då författarna inte haft möjligt att lyfta samtliga orsaker till en lång ledtid vore det i vidare studier intressant att se vilka övriga faktorer som påverkar ledtiden, både i ett produktionssystem och vid sidan av produktionssystemet. Studien som

genomförts inkluderar enbart processledtiden i ett produktionssystem som tillverkar kundanpassade produkter. Då processledtiden utgör en del i den totala ledtiden finns det därför andra delar av den totala ledtiden som kan vara av intresse att studera. Bland annat är ledtiden för materialförsörjning, konstruktion, planering, administration och distribution några av de element som skulle kunna studeras. Enligt författarna torde ledtiden för konstruktion vara av störst intresse då en produkt måste konstrueras fullt ut eller i delar innan den kan tillverkas samt att konstruktion utgör en central del i verksamheten vid tillverkning av kund- anpassade produkter. En reduktion av ledtiden för konstruktion av en produkt påverkar således direkt den totala ledtiden.

Vidare studier av ledtidsreduktion för kundanpassade produkter som tillverkas i ett produktionssystem med fokus på konstruktionsprocessen anser författarna skulle kunna vara ett utmärkt komplement till denna studie.

Referenser

Andries, B. & Gelders, L. (1995). Time-based manufacturing logistics. Logistics Information Management, vol. 8,

Iss: 6, 25-31.

Benneth, J. (2003). Evaluation methods in research. New York: Continuum.

Blackstone, J. H., Phillips, D. T. & Hogg, G. L. (1982). A state-of-the-art survey of dispatching rules for manufacturing job shop operations. International Journal of Production Research, vol. 20, Iss: 1, 27-45.

Bukchin, J., Tzur, M. & Jaffe, M. (2002). Lot splitting to minimize average flow-time in a two-machine flow-shop. IIE Transactions, vol. 34, Iss: 11, 953-970.

Bäck, H. & Halvardsson, A. (1992). Metodbok – projekt och utredningar. Stockholm: SNS Förlag.

Chang, T. M. & Yih, Y. (1994). Generic kanban systems for dynamic environments. International Journal of

Production Research, vol. 32, Iss: 4, 889-902.

Christopher, M. & Towill, D. R. (2000). Supply chain migration from lean and functional to agile and customised. Supply Chain Management: An International Journal, vol. 5, Iss: 4, 206-213.

Corbey, M. & Jansen, R. (1993). The economic lot size and relevant costs. International Journal of Production

Economics, vol. 30-31, 519-530.

Creswell, J. W. (2009). Reaserch Design: Qualitative, Quantitative, and Mixed Method Approches (3. uppl.). Thousand Oaks: SAGE Publications, Inc.

Dahlgaard, J. J. & Dahlgaard-Park S. M. (2006) Lean production, six sigma quality, TQM and company culture. The TQM Magazine, vol. 18, Iss: 3, 263-281.

De Toni, A. & Meneghetti, A. (2000). Traditional and innovative path toward time-based competition.

International Journal of Production Economics, vol. 66, 255-268.

Douglas, S. P. & Craig, C. S. (2010). Global marketing strategy: past, present and future. Advances in

International Management, vol. 23, 431-457.

Duggan, K. J. (2002). Creating mixed model value streams: practical lean techniques for building to demand. New York, N.Y.: Productivity Press.

Framinan, J. M., González, P. L. & Ruiz-Usano, R. (2003). The CONWIP production control system: Review and research issues. Production Planning and Control: The Management of Operations, vol. 14, Iss: 3, 255- 265.

Gaury, E. G. A., Pierreval, H. & Kleijnen, J. P. C. (2000). An revolutionary approach to select a pull system among Kanban, Conwip and Hybrid. Journal of Intelligent Manufacturing, vol. 11, Iss: 2, 157-167.

Geiger, C. D., Uzsoy, R. & Aytuğ, H. (2006). Rapid modeling and discovery of priority dispatching rules: an autonomous learning approach. Journal of Scheduling, vol. 9, Iss: 1, 7-34.

Geraghty, J. & Heavey, C. (2005). A review and comparison of hybrid and pull-type production control strategies. OR Spectrum, vol. 27, Iss: 2-3, 435-457.

Glock, C. H. (2012). Lead time reduction strategies in a single-vendor-single-buyer integrated inventory model with lot size-dependent lead times and stochastic demand. International Journal of Production Economics.

Vol. 136, Iss:1, 37-44.

Grabot, B. & Geneste, L. (1994). Dispatching rules in scheduling: a fuzzy approach. International Journal of

Grosfeld-Nir, A., Magazine, M. & Vanberkel, A. (2000). Push and pull strategies for controlling multistage production systems. International Journal of Production Research, vol. 38, Iss: 11, 2361-2375.

Gung, R. R. & Steudel, H. J. (1999). A workload balancing model for determining set-up time and batch size reductions in GT flow line workcells. International Journal of Production Research, vol. 37, Iss: 4, 769-791. Hines, P. & Rich, N. (1997) The seven value stream mapping tools. International Journal of Operations &

Production Management, vol. 17, Iss: 1, 46-64.

Ho, J. C. & Chang, Y-L. (2001). An integrated MRP and JIT framework. Computers & Industrial Engineering,

vol. 41, Iss: 2, 173-185.

Holme, I. M. & Solvang B. K. (1997). Forskningsmetodik: Om kvalitativa och kvantitativa metoder (2. uppl.). Lund: Studentlitteratur AB.

Hopp, W. J. & Spearman, M. L. (2008). Factory physics. International 3. ed. Boston: McGraw-Hill Publishing. Hopp, W. J., Spearman, M. L. & Woodruff, D. L. (1990a). Practical Strategies for Lead Time Reduction.

Manufacturing Review, vol. 3, Iss: 2, 78-84.

Huang, C. C. & Kusiak, A. (1998). Manufacturing control with a push-pull approach. International Journal of

Production Research, vol. 36, Iss: 1, 251-275.

Huang, R-H. (2010). Multi-objective job-shop scheduling with lot splitting production. International Journal

of Production Economics, vol. 124, Iss: 1, 206-213.

Huang, M., Wang, D. & Ip, W. H. (1998). A simulation and comparative study of the CONWIP, Kanban and MRP production control systems in a cold rolling plant. Production Planning & Control: The Management of

Operations, vol. 9, Iss: 8, 803-812.

Hung, Y-F. & Chang, C-B. (2002). Dispatching rules using flow time predictions for semiconductor wafer fabrications. Journal of Chinese Institute of Industrial Engineers, vol. 19, Iss: 1, 67-74.

Jacobs, F. R. & Bragg, D. J. (1988). Repetitive lots: Flow-time reductions through sequencing and dynamic batch sizing. Desicion Sciences, vol. 19, Iss: 2, 281-294.

Jacobsen, D. I. (2002). Vad, hur och varför: Om metodval i företagsekonomi och andra samhällsvetenskapliga ämnen. Lund: Studentlitteratur AB.

Jayamohan, M. S. & Rajendran, C. (2000). New dispatching rules for shop scheduling: a step forward.

International Journal of Production Research, vol. 38, Iss: 3, 563-586.

Jonsson, P. & Mattsson, S-A. (2005). Logistik: läran om effektiva materialflöden. Lund: Studentlitteratur AB. Karmarkar, U. S. (1987a). Lot sizes, lead times and in-process inventories. Management Science, vol: 33, Iss: 3, 409-418.

Karmarkar, U. S. (1987b). Controlling W.I.P. and Leadtimes in Job Shops. Center for Manufacturing and

Operations Management, William E. Simon Graduate School of Business Administration, University of

Rochester.

Karmarkar, U.S., Kekre, S., Kekre, S. & Freeman, S. (1985). Lot-Sizing and Lead-time Performance in a Manufacturing Cell. The Institute of Management Sciences, March-April 1985, 1-9.

Khojasteh-Ghamari, Y. (2009). A performance comparison between Kanban and CONWIP controlled assembly systems. Journal of Intelligent Manufacturing, vol. 20, Iss: 6, 751-760.

Kropp, D. H. & Smunt, T. L. (1990). Optimal and Heuristic Models for Lot Splitting in a Flow Shop.

Kuhlang, P., Edtmayr, T. & Sihn, W. (2011). Methodical approach to increase productivity and reduce lead time in assembly and production-logistic processes. CIRP Journal of Manufacturing Science and Technology, vol. 4,

Iss: 1, 24-32.

Lamouri, S. & Thomas, A. (2000). The two level master production schedule and planning bills in a just in time MRP context. International Journal of Production Economics, vol. 64, Iss: 1-3, 409-415.

Liker, J.K. & Meier, D. (2006). The Toyota way fieldbook: a practical guide for implementing Toyota's 4Ps. New York: McGraw-Hill.

Liu, K-C. (1998). Dispatching rules for stochastic finite capacity scheduling. Computers & Industrial

Engineering, vol. 35, Iss: 1-2, 113-116.

Low, C., Hsu, C-M. & Huang, K. (2004). Benefits of lot splitting in job-shop scheduling. The International

Journal of Advanced Manufacturing Technology, vol. 24, Iss: 9-10, 773-780.

Lumsden, K. (2006). Logistikens grunder (2. uppl.). Lund: Studentlitteratur AB.

Martin, J. (2007). Lean Six Sigma for Supply Chain Management: The 10-Step Solution Process. McGraw-Hill Companies.

Martin, A. D., Chang, T-M., Yih, Y. & Kincaid, R. K. (1998). Using tabu search to determine the number of kanbans and lotsizes in a generic kanban system. Annals of Operations Research, vol. 78, Iss: 0, 201-217. McIntosh, R. I., Culley, S. J., Mileham, A. R. & Owen G. W. (2000). A critical evaluation of Shingo’s ‘SMED’ (Single Minute Exchange of Die) methodology. Internatiional Journal of Production Research, vol. 38, Iss:

11, 2377-2395.

Miltenburg, J. (2005). Manufacturing strategy: How to formulate and implement a winning plan. (2. uppl.). New York: Productivity Press.

Moily, J. P. (1986). Optimal and heuristic procedures for component lot-splitting in multi-stage manufacturing systems. Management Science, vol. 32, 113-125.

Moore, R. & Scheinkopf, L. (1998) Theory of Constraints and Lean Manufacturing: Friends or Foes?.

Chesapeake Consulting, Inc., 1-37.

Olhager, J. (2000). Produktionsekonomi. Lund: Studentlitteratur AB.

Olsson, H. & Sörensen, S. (2011). Forskningsprocessen: kvalitativa och kvantitativa perspektiv (3. uppl.). Stockholm: Liber AB.

Patel, R. & Davidson, B. (2011). Forskningsmetodikens grunder: att planera, genomföra och rapportera en undersökning (4. uppl.) Lund: Studentlitteratur AB.

Rahman, S. (1998). Theory of constraints: A review of the philosophy and its applications. International

Journal of Operations & Production Management, vol. 18, Iss: 4, 336-355.

Rajendran, C. & Holthaus, O. (1999). A comparative study of dispatching rules in dynamic flowshops and jobshops. European Journal of Operational Research, vol. 116, Iss: 1, 156-170.

Rosen, L. D. & Karwan, K. R. (1994). Prioritizing the Dimensions of Service Quality: An Empirical Investigation and Strategic Assessment. International Journal of Service Industry Management, vol. 5, Iss, 4, 39-52. Rother, M. & Shook, J. (2001). Lära sig se: Att kartlägga och förbättra värdeflöden för att skapa mervärden och

eliminera slöseri: en handbok för praktisk tillämpning av metoder och verktyg för Lean produktion. Göteborg: Lean

Enterprise Institute Sweden.

Spearman, L. M., Woodruff, L. D. & Hopp, J. W. (1990b). CONWIP: a pull alternative to kanban.

International Journal of Production Research, vol. 28, Iss: 5, 879-894.

Srinivasan, M. M. (2004). Streamlined: 14 Priciples for Building and Managing the Lean Supply Chain. Mason, Ohio: Thomson Learning.

Stock, G. N., Greis, N. P. & Kasarda, J. D. (1999). Logistics strategy and structure: a conceptual framework. International Journal of Physical Distribution & Logistics Management, vol. 29, Iss: 4, 224-239.

Sörqvist, L. (2004). Ständiga förbättringar: en bok om resultatorienterat förbättringsarbete, verksamhetsutveckling och Sex

Sigma. Lund: Studentlitteratur AB.

Tardif, V. & Maaseidvaag, L. (2001). An adaptive approach to controlling kanban systems. European Journal

of Operational Research, vol. 132, Iss: 2, 411-424.

Tersine, R. J. & Hummingbird, E. A. (1995) Lead-time reduction: the search för competitive advantage.

International Journal of Operations & Production Management, vol. 15, Iss: 2, 8-18.

Tsourveloudis, N. C., Dretoulakis, E. & Ioannidis, S. (2000). Fuzzy work-in-process inventory control of unreliable manufacturing systems. Information Sciences, vol. 127, Iss: 1-2, 69-83.

Uzsoy, R., Lee, C-Y. & Martin-Vega, L. A. (1994). A review of production planning and scheduling models in the semiconductor industry part II: Shop-floor control. IIE Transactions, vol. 26, Iss: 5, 44-55.

Ward, P. T., McCreery, J. K., Ritzman L. P. & Sharma D. (1998) Competitive Priorities in Operations Management. Decision Sciences, Vol. 29, Iss: 48, 1035-1046.

Wedel, J. & Lumsden, K. (1995). The influence of lead-time reductions on decisions and rules in the production planning process. International Journal of Production Economics, vol. 41, 399-404.

Williamson, K. (2002). Research methods for students, academics and professionals: information management and systems. 2. ed. Wagga Wagga: Centre for Information Studies.

Yin, R. K. (2009). Case study research: design and methods. 4. ed. London: SAGE.

Yin, R. K. (2012). Applications of Case Study Research. 3. ed. Thousand Oaks, Calif.: SAGE.

Yingni, Z., Shudong, S., Junqiang, W. & Ganggang, N. (2011). Job shop bottleneck detection on orthogonal experiment. Computers & Industrial Engineering, vol. 61, Iss: 3, 872-880.

Özbayrak, M., Papadopoulous, T.C. & Samaras, E. (2006). A flexible and adaptable planning and control system for an MTO supply chain system. Robotics and Computer-Integrated Manufacturing, vol. 22, Iss: 5-6, 557- 565.

Bilagor