An Improved VLSI Test Economics Analysis System - Laboratory for ...

Let R dp be depreciative rate, the depreciation dierence ratio function can be estimatedasf dp (R dp )=1, (1 , R dp ) T d: (2.27)Then, equipment cost (C equip ) can be estimated asXCd equip =U hw f dp (R hw dp )+U hw mt T d + C hw traineach Xhw+U sw f dp (R sw dp )+U sw mt ) T d + C sw train ;each sw(2.28)where U hw is price, R hw dp is depreciative rate, U hw mt is maintenance cost andC sw train is training cost of the hardware. Similarly, U sw is price, R sw dp is depreciativerate, U sw mt is maintenance cost and C sw train is training cost of the software.Moreover, if we use type II cost model for price cost to eliminate exponential term,the estimation equation can be given byXCd equip =(U hw R hw dp + U hw mt ) T d + C hw traineach Xhw+(U sw R sw dp + U sw mt ) T d + C sw train ;each sw(2.29)Design Space (Cd space ): Some companies rent the departments of their oce, but some buyit. Thus, two equations are developed for these situations. For the companies whichrent the departments, let Rd space be the design department space ratio of the wholerented space, U rent be annual rent, and T d be the development time. The space costis then given bywhere K space is user-dened space cost.Cd space = Rd space U rent T d + K space ; (2.30)If the companies buy the buildings of their oce, the interest and the appreciationof land should be taken into account. As our type III cost model, the space cost canbe expressed asCd space = Rd space U space [(1 + R int ) T d, (1 + R sp ap ) T d]+K space ; (2.31)22