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MODEL INVENTORI PADA BARANG FARMASI YANG DETERIORATING DENGAN TINGKAT PERMINTAAN KUBIK DAN MEMPERTIMBANGKAN TINGKAT PENYIMPANAN KUADRATIK
This research formulates an inventory model for pharmaceutical items that deteriorates over time due to their logarithmically changing demand and by considering quadratic storage rates. The optimal solution indicates that when the inventory reaches zero (t_1^*) the value is 0.965627 and the cycle length (T_1^*) is 855.22268 resulting in an average minimum total cost ((TC) ̅) of $3.1306×10^4 per cycle. Sensitivity analysis results show that t_1^* is stable at the variable coefficient parameter t at demand levels (b) and (c), t_1^* increases at the damage rate parameter (θ) and the constant at the demand level (a), and t_1^* decreases at the variable coefficient t parameter at the demand level (d), item damage cost (D_c), shortage cost per item (s), storage cost (h), and variable coefficient t at the storage level (α). The values of T_1^* and (TC) ̅ are stable at b, c, and D_c. The values of T_1^* and (TC) ̅ decrease at parameters d and s, the value of T_1^* decreases and (TC) ̅ increases at parameter θ, while the value of T_1^* increases and (TC) ̅ decreases at parameter a, and the values of T_1^* and (TC) ̅ increase at parameters h and α