Nowadays, the demand of third-party logistics provider becomes an increasingly important issue for companies to improve their customer service and to decrease logistics costs. This paper presents an integrated fuzzy approach for the evaluation and selection of 3rd party logistics service providers. This method consists of two techniques: (1) use fuzzy analytic hierarchy process to identify weights of evaluation criteria; (2) apply fuzzy technique for order preference by similarity to ideal solution (TOPSIS) method to evaluate and sequence alternatives and to make the final selection. Finally, an actual industrial application is performed in logistics department of a tire manufacturing company. For this, first, eight logistics supplier selection criteria were determined, and then the best alternative among seven logistics service provider companies was selected by the proposed method.
Risk management is an important issue in manufacturing companies in today's competitive market. Failure modes and effects analysis (FMEA) method is a risk management tool to stabilize production and enhance market competitiveness by using risk priority numbers (RPN). Although the traditional FMEA approach is an effectively and commonly used method, it has some shortcomings such as assumption of equal importance of the factors, severity, occurrence and detectability, and not following the ordered weighted rule. Thus, in order to improve RPN, an integrated method combining grey relational analysis (GRA) with FMEA is used in this study. The purpose of this paper is to contribute to risk management activities by proposing solutions to assembly line problems in an automotive manufacturing company by using combined GRA and FMEA method. In the proposed method, the priorities of production failures were determined by GRA approach and these failures were minimized by using FMEA technique. The study results indicated the actions that lead to enhancement in the product. The implementation of corrective/preventive activities resulted in 96 % improvement in door seal cuts problem caused by the door step assembly. Door seal cuts problem caused by instrument panel assembly and the noisy door window problem are solved completely.
istatistiksel deneyler(İD), ürün parametrelerinin ve parametre değişkenlerinin artmasına paralel faktöriyel artmakta; bu da maliyet ve zaman açısından pratikte uygulanabilirliğini yitirmektedir. Ancak Taguchi Yöntemi(TY) daha az denemeli ve klasik yöntem kadar iyi sonuçlar veren ortogonal diziler(OD) geliştirmiştir. OD, faktör seviyelerini birer birer değiştirmek yerine eşzamanlı olarak değiştirmeye olanak verir. Taguchi, kaliteyi sağlamak için yapılan çalışmaları çevrim içi (on-line) ve çevrim dışı (off-line) olmak üzere ikiye ayırmaktadır. İD tasarımı Taguchi'nin kalite sisteminde çevrim dışı kalite kontrol içinde yer almaktadır. Çalışmada, kalite problemlerine neden olan değişkenlik kaynakları belirlenerek, kalite karakteristiklerinin eniyilemesine olanak veren TY, çok yanıtlı problemlerin eniyilemesinde kullanılarak, endüstriyel bir uygulamadaki iyileştirmeleri ve yöntemin etkinliğini ortaya koymak amaçlanmıştır.
One of the best methods of waste recycling in the construction sector is to employ it in concrete or mortar preparation. In this study, recycled concrete aggregate and bottom ash were used as aggregates in the mortar. Additionaly, expanded perlite which is a material providing lightness, heat insulation and fire resistance, was also used as aggregate. Calcium aluminate cement was preferred as binder to improve fire resistance. Results were obtained and evaluated in terms of flexural and compressive strength, dry unit weight, water absorption, capillarity, thermal conductivity, thermal resistance and cost by following a Taguchi method to internal curing, cement quantity and aggregate ratio as parameters.
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