A rough set based approach to distributor selection in supply chain management
Introduction
Industry is now strongly recognizing that total management of the supply chain enhances the competitive edge of all “players” therein. As a result, Supply chain management (SCM) has received more attentions from both academicians and practitioners in the past decade. Many articles and books have been published for the methods and opinions about the application of supply chain management. Although there is no generally accepted notion of supply chain, at least it should contain the suppliers’ suppliers and the customers’ customers. Supply chain in this paper refers to a network of integrated and dependent process through which specifications are transformed to finished deliverables. Fig. 1 depicts a conceptual framework for supply chain.
Supplier selection and evaluation play an important role in the supply chain process and are crucial to the success of manufacturing firms (Sevkli, Lenny Koh, Zaim, Demirbag, & Tatoglu, 2008). There are many researchers in supplier selection, and many methodologies are applied in practice, such as the cost-ratio method, linear or mixed integer programming to goal and multi-objective linear programming models (Ghodsypour and O’Brien, 1998, Oliveria and Lourenco, 2002, Yan et al., 2003). Although these methods have been widely used in the area of supplier selection, there are certain drawbacks associated with the implementation of these methods. Apart from these traditional methods for supplier selection, recently fuzzy systems theory has been successfully applied to supplier selection problems (Chan and Kumar, 2007, Kahraman et al., 2004, Kahraman et al., 2003), and Rough set theory (RST) has also been applied for preferred suppliers prediction (Tseng, Huang, Jiang, & Ho, 2006).
To date, numerous literatures have explored the issues of supplier selection. In contrast, little work has been done in selection of distributor, particularly in empirical studies. Only conceptual, descriptive and simulation results focused primarily on firm resources and general marketing/selling factors were discussed (Abratt and Pitt, 1989, Cavusgil et al., 1995, Shipley et al., 1989, Yeoh and Calantone, 1995). It should be noted that distributor selection has not been studied deeply and the theoretical methods developed by academics have not been fully applied in industry. In this paper, we propose a rough set based methodology which is able to perform rule induction effectively. Moreover, the weight of each input feature is incorporated in the proposed approach so as to enhance quality of the derived rules.
The remainder of this paper is organized as follows: The next section introduces the background of distributor rough set theory and the standard rough set-based rule induction problem. Section 3 presents the basic rule identification algorithm to determine the reducts with both equal and unequal weight features. A case study is presented to show how the rule identification approach can be applied to distributor selection in Section 4. Section 5 concludes the paper with discussion of empirical findings and future research directions.
Section snippets
Literature review on distributor research
As mentioned above, there are few empirical studies for manufacturers’ distributor selection. Ross (1973) studied the selection of the overseas distributor. The author concluded that whether or not the exporter will be able to achieve his goals depends to a great extent on how well he has carried out his analysis of which firm will do the best possible job for him in a particular market. Lindqvist (1983) reviewed the research trends in distribution in Finland and found that the factors
Rule identification algorithms
The proposed conceptual framework to elicit decision rules consists of the following steps: problem definition, data preparation, data partition, reduct generation, and rule-validation as shown in Fig. 2.
Case studies
The distributor selection is an important issue in supply chain management, especially in the current competitive marketing environment. Although the distributors face increasing challenges in a competitive environment (Kalafatis, 2000, Mudambi and Aggarwal, 2003), the power of distributors’ in marketing channels is getting stronger and stronger, which give much advantages in negotiation with vendors and buyers and makes it more crucial in selecting a good distributor for manufacturers.
Conclusions
In this paper, distributors’ selection is analyzed based on the rough set theory approach in both equal and unequal weight features. Through this method, several rules are generated for distributors’ evaluation and selection. The result not only shows the effectiveness of unequal weight incorporated rules identification, but also it shows the importance of the relationship intensity, marketing experience, and the management ability in selecting the distributors. These rules have been proved to
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