ارائه ی یک مدل موجودی برای خرابی غیر آنی کالا در یک زنجیره تامین دوسطحی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 استادیار، دانشکده مهندسی صنایع، دانشگاه علوم و فنون مازندران، مازندران

2 کارشناسی ارشد، دانشکده مهندسی صنایع، دانشگاه علوم و فنون مازندران، مازندران

3 کارشناسی ارشد، دانشکده مهندسی صنایع، دانشگاه پردیسان فریدون‌کنار، مازندران

چکیده

در این تحقیق یک مدل ریاضی برای زنجیره‌تامین دوسطحی متشکل از یک خریدار و یک تولیدکننده برای یک سیستم یکپارچه موجودی با خرابی غیر آنی اقلام ارائه می­شود که تقاضا احتمالی است و از توزیع نرمال پیروی می­کند. فرض می­شود خرابی از توزیع وایبول سه پارامتر پیروی می­کند. در شرایط واقعی در نظر گرفتن کمبود هم به‌صورت پس­افت و هم به‌صورت فروش از­ دست­رفته الزامی است، بنابراین هر دو نوع کمبود نیز در مدل بکار گرفته می­شود. هدف از این مدل تعیین سیاست بهینه سفارش دهی است بطوری­که مجموع هزینه­های زنجیره­تامین کمینه گردد. برای حل مدل از الگوریتم­ ژنتیک بهره برده شده است. همچنین جهت تحلیل مدل و بررسی تأثیر برخی از پارامترهای مهم و تأثیرگذار بر جواب بهینه مدل موجودی از تحلیل حساسیت نرخ خرابی و سطح اطمینان استفاده می‌نماییم. در نهایت مقدار بهینه هزینه مورد انتظار زنجیره­تامین تحت تصمیم­گیری یکپارچه و غیر یکپارچه تعیین و مقایسه می­گردد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

An inventory model for non-instantaneous deterioration items in a two‌-echelon Supply chain

نویسندگان [English]

  • Javad Rezaeian 1
  • Moghaddaseh Akbarpoor 2
  • Hadiseh Akbarpoor 3
چکیده [English]

Most of the inventory control models assume that items can be stored indefinitely to meet the future demands. However, certain types of commodities either deteriorate or become obsolete in the course of time and hence are unstable. In this study, a mathematical model is presented for a two-echelon supply chain including a buyer and a producer for an inventory integrated system with non-instantaneous of items that demand is probable and follows a normal distribution. Since, the rate of deterioration describes the condition deterioration the goods and regarding the relation between time and deterioration rate is probable rather than the fixed rate of deterioration. In reality, considering the shortages is necessary in both forms of backlogging and lost sales. Therefore, both kinds of shortages are used in the model.
   The main goal of this model is determining the optimal ordering policy so that the total cost of supply chain is minimized. The proposed model is solved for some problems by Lingo software. The validity of model is determined by sensitive analysis and the problem is known a NP-hard one, hence a genetic algorithm has been used in order to solve the model problem. The rates of deterioration and confidence level sensitivity analysis have been applied to analyze effect of some important parameters affecting on optimal solution of the inventory model.
   Finally, the optimal value of the expected cost of supply chain under integrated and non-integrated decision-making has been determined and compared. The results show the efficiency of algorithm

کلیدواژه‌ها [English]

  • two-echelon supply chain
  • non-instantaneous deterioration
  • inventory model

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