ارائه ي مدل برنامه ريزي استوار يكپارچه براي تخصيص سفارش در زنجيره ي تامين

An Integrated Robust Optimization Model for Supplier Selection and Order Allocation in a Supply Chain

در ﺑﯿﺸﺘﺮ ﺻﻨﺎﯾﻊ ﻫﺰﯾﻨﻪ ي ﻣﻮاد ﺧﺎم و اﺟﺰاي ﺗﺸﮑﯿﻞ دﻫﻨﺪه ي ﻣﺤﺼﻮل، در ﺣﺪود 60% از ﺑﻬﺎي ﺗﻤﺎم ﺷﺪه (در ﺑﺮﺧﯽ از ﺻﻨﺎﯾﻊ ﺗﺎ 80%) را در ﺑﺮﻣﯽ ﮔﯿﺮد. در ﭼﻨﯿﻦ ﺷﺮاﯾﻄﯽ، ﻣﻨﺒﻊ ﯾﺎﺑﯽ ﻣﻨﺎﺳـﺐ، ﻣـﯽ ﺗﻮاﻧـﺪ ﻧﻘﺸـﯽ ﮐﻠﯿـﺪي در ﮐـﺎراﯾﯽ و اﺛﺮﺑﺨﺸﯽ ﺳﺎزﻣﺎن اﯾﻔﺎ ﻧﻤﻮده و ﺗﺎﺛﯿﺮ ﻣﺴﺘﻘﯿﻤﯽ در ﮐﺎﻫﺶ ﻫﺰﯾﻨﻪ ﻫﺎ، ﺳﻮدآوري و اﻧﻌﻄﺎف ﭘﺬﯾﺮي ﯾﮏ ﺷﺮﮐﺖ داﺷﺘﻪ ﺑﺎﺷﺪ. در ﻣﻘﺎﻟﻪ ي ﺣﺎﺿﺮ ﺗﻌﯿﯿﻦ ﮐﻤﯿﺖ ﻣﻄﻠﻮب ﺳﻔﺎرش در ﺣﺎﻟﺖ وﺟﻮد ﭼﻨﺪ ﺗﺎﻣﯿﻦ ﮐﻨﻨﺪه، ﭼﻨﺪ ﻣﺤﺼـﻮل، در ﻃـﯽ ﭼﻨﺪ دوره، در ﺣﺎﻟﺖ ﻣﺠﺎز ﺑـﻮدن ﻣـﺎزاد و ﮐﻤﺒـﻮد، ﺑـﺎ ﻟﺤـﺎظ ﻣﺎﻫﯿـﺖ ﭼﻨـﺪﻣﻌﯿﺎره و ﭼﻨﺪ ﻫﺪﻓـﻪي ﻣﺴـﺎﻟﻪ و وﺟـﻮد ﺗﺨﻔﯿﻒ اﻓﺰاﯾﺸﯽ، ﺑﺎ ﻟﺤﺎظ ﻋﺪم اﻃﻤﯿﻨﺎن در ﭘﺎراﻣﺘﺮﻫﺎي ﺗﻘﺎﺿﺎ، زﻣﺎن اﻧﺘﻈﺎر، ﻫﺰﯾﻨﻪ ي ﺛﺎﺑﺖ ﺳﻔﺎرش، ﺳﻄﺢ ﮐﯿﻔﯿـﺖ ﺗﺎﻣﯿﻦ ﮐﻨﻨﺪه و ﺑﻮدﺟﻪ ي ﻫﺮ دوره ﻣﺪ ﻧﻈﺮ ﻗﺮار ﮔﺮﻓﺘﻪ و ﺑﺎ اﺳﺘﻔﺎده از ﺑﺮﻧﺎﻣﻪ رﯾﺰي ﻣﺨﺘﻠﻂ ﺻﺤﯿﺢ اﺳﺘﻮار ﻣﺪل و ﺣـﻞ ﺷﺪه اﺳﺖ. ﺑﻪ ﻣﻨﻈﻮر ﻟﺤﺎظ ﻣﻌﯿﺎرﻫﺎي ﻣﻮﺛﺮ ﺑﺮ اﻧﺘﺨـﺎب ﺗـﺎﻣﯿﻦ ﮐﻨﻨـﺪه در ﻣـﺪل رﯾﺎﺿـﯽ از ﻓﺮآﯾﻨـﺪ ﺗﺤﻠﯿـﻞ ﺷـﺒﮑﻪ و ﺑﻪ ﻣﻨﻈﻮر ﻟﺤﺎظ واﺑﺴﺘﮕﯽ داﺧﻠﯽ ﻣﯿﺎن ﻣﻌﯿﺎرﻫﺎ از دﯾﻤﺘـﻞ اﺳـﺘﻔﺎده ﺷـﺪه اﺳـﺖ. در ﭘﺎﯾـﺎن ﻧﺘـﺎﯾﺞ و ﭘﯿﺸـﻨﻬﺎدات اراﺋـﻪ ﻣﯽ ﺷﻮد.

In most industries the cost of raw materials and product components constitutes almost 60% percent of a product cost (in some industries up to 80%). In this condition، proper sourcing can play a key role in an organization's efficiency and effectiveness، because it has a direct effect on cost reduction، profitability and flexibility of a company. In this paper، to determine the optimal order quantity, multi supplier، multi product and during several periods، shortage and surplus، incremental discounts، multi objective and multi criteria nature of the problem، uncertainty in demand، lead time، fixed order cost، supplier quality level and every period budget are being considered. To incorporate the effective criteria in mathematical model، analytic network process approach has been used. After developing the robust multi objective mixed integer programming، a numerical example is presented. Finally, the results and suggestions for future studies are presented.