TEDARİK ZİNCİRİ İYİLEŞTİRMESİNE YALIN ALTI SİGMA KULLANIMI İLE SİSTEMATİK BİR YAKLAŞIM VE BİR GÜBRE ŞİRKETİNDE UYGULANMASI

Öz

Bu çalışmasının amacı, Yalın Altı Sigma araçlarını kullanarak işletmenin tedarik zinciri süreçlerini gözden geçirmek ve mevcut durumun yeterliliğini sorgulamaktır. İşletmenin tedarik zincirindeki maliyet kalemleri finans sorumluları ile görüşülerek sigorta gideri, depo kirası, finansman gideri ve evsafı bozulan ürünlerin maliyeti olarak sıralanmıştır. Stokta kalma süresini ve stok miktarını azaltmak için TÖAİK (Tanımla, Ölç, Analiz Et, İyileştir, Kontrol) tekniği kullanılmıştır. Tanımla aşamasında sistemin mevcut durumu ortaya çıkarılarak SIPOC aracı ile süreç analiz edilmiş ve CTQ diagramı çıkarılarak projenin metrikleri belirlenmiştir. Analiz aşamasında Kanban yöntemi kullanılarak ortalama stok miktarı hesaplanmıştır. Daha sonra stok miktarını arturan sebepler balık kılçığı ile analiz edilmiş, gerekli önlemler alındıktan sonra yanetkilere karşı sorunların önlenmesi için kontrol mekanizmaları kurulmuştur.

Anahtar Kelimeler

• Yalın Altı Sigma,Altı Sigma,Tedarik Zinciri,Kanban

A SYSTEMATIC PERSPECTIVE ON SUPPLY CHAIN IMPROVEMENT BY USING LEAN SIX SIGMA AND AN IMPLEMENTATION AT A FERTILIZER COMPANY

Öz

The purpose of this study is to review the supply chain processes of an enterprise using Lean Six Sigma tools and question the adequacy of the existing situation. The cost items in the supply chain of the company are discussed with the finance officers and listed as insurance expense, warehouse rent, financial expense and cost of spoiled goods. The DMAIC (Define, Measure, Analyze, Improve, Control) technique was used to decrease inventory time and inventory amount. By defining the current situation of the system in the Define phase, the process is analyzed with the SIPOC tool, and a CTQ diagram is created to determine the project metrics. In the Analyze phase, the average inventory is calculated using the Kanban method. Then, the reasons that increase the inventory are analyzed by a fishbone diagram, and after the necessary precautions, a control mechanism is established to prevent possible side effects of the project.

Anahtar Kelimeler

• Lean Six Sigma,Six Sigma,Supply Chain,Kanban

Kaynakça

1. B. Michael, "10 Signs You Respect Me As An Employee," 10 June 2014. [Online]. Available: https://www.fastcompany.com/3036623/10-signs-you-respect-me-as-an-employee.
2. Y. Sugimori, K. Kusunoki, F. Cho and S. Uchikawa, "Toyota Production System and Kanban system: materialization of just-in-time and respect-for-human system," International Journal of Production, pp. 553-564, 1977.
3. R. Paulina, J. Trojanowska and P. Chabowski, "Tools and methods of Lean Manufacturing - a literature review," in Technological Forum 2016, Prague, 2016.
4. A. Naufal, A. Jaffar, N. Yusoff and N. Hayati, "Development of Kanban System at Local Manufacturing Company in Malaysia – Case Study," in International Symposium on Robotics and Intelligent Sensors 2012 (IRIS 2012), 2012.
5. C. Yıldırım, Lean Six Sigma Methodology And An Applied Study, Istanbul, 2011.
6. Y. Monden, "Adaptable Kanban System Maintains Just-In-Time Production," in Toyota Production System, 1994, pp. 15-35.
7. M. N. A. Mohd Nizam Ab Rahman, N. Khamis, R. M. Zain and B. M. Deros, "Implementation of 5S Practices in the Manufacturing Companies: A Case Study,"  American Journal of Applied Sciences , 2010.
8. L. Khaimovich, "Solving a Problem and Getting Along: Toward the Effective Root Cause Analysis," Annual Quality Congress, vol. 52, pp. 816-830, 1998.

9. T. Goh, "A strategic assessment of six-sigma," Quality and Reliability Engineering International, pp. 403-410, 2002.
10. L. Paul, "Practice makes perfect," CIO Enterprise, vol. 12, 15 January 1999.
11. R. Schonberger, World Class Manufacturing, New York: The Free Press, 1986.
12. R. &. Strong, Rath & Strong’s Six Sigma Pocket Guide, Lexington: Rath & Strong Publishing, 2000.
13. F. Breyfogle, Implementing Six Sigma: Smarter Solutions Using Statistical Methods, NY: John Wiley & Sons: New York, 1999.
14. F. T. Anbari, "Success Factors in Managing Six Sigma Projects," in 2004 Project Management Institute Research Conference, London, UK, 2004.
15. F. Z. Düğme, A Guide For Construction Companies To Apply Lean Six Sigma Methodology, 2008.
16. W. Deming, "Out of the Crisis," MIT Center for Advanced Engineering Study, Cambridge, MA., 2000.
17. J. Evans and M. Lindsay, The Management and Control of Quality, South-Western Thomson Learning, 1999.
18. T. Pyzdek, The SIX SIGMA HANDBOOK, McGraw-Hill, 2003.