441 불확실한 수율과 고객이탈행위를 고려한 강건한 뉴스벤더 모델 정  ․ 세 동대학 영학 Robust Newsvendor Model With Random Yield and Customer Balking Uk Jung ․ Se Won Lee Department of Management, Dongguk University-Seoul, Seoul, South Korea Abstract Purpose: In this paper, we have considered a problem of newsvendor model in an environment of random yields in quality and customer balking behavior, in which only the mean and the variance of the demand are known. In practice, the distributional information of the demand is very limited and only the mean and variance are guessed by experience. In addition, due to the customers balking behavior occurring when the available inventory level decreases, the product’s demand becomes a function of inventory level so that the classical newsvendor’s optimal order quantity is no longer optimal. Methods: We have developed an optimal order quantity model that enables us to incorporate the random yield of a product and the customer balking information such as a threshold inventory level of balking and the corresponding probability of a sale during the balking. Results: We illustrated the concepts developed here through simple numerical examples and showed the ro- bustness of our model in a various setting of parameters. Conclusion: This paper provides a useful analysis showing that our distribution-specific and distribution-free approach to the optimal order quantity in the newsboy model can act as an effective tools to match supply with demand for these product lines. Key Words：Distribution-Free Approach, Newsvendor Problem, Balking, Random Yield † \ ● Received 10 October 2012, revised 14 December 2012, accepted 13 December 2012 Corresponding Author(swlee94@dongguk.edu) ⓒ 2012, The Korean Society for Quality Management This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-Commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. ISSN(print) : 1229-1889 J Korean Soc Qual Manag Vol. 40, No. 4: 441-452, December 2012 http://dx.doi.org/10.7469/JKSQM.2012.40.4.441