Public WH Design (Problem 24) K $/yr = ( ) b AC $/slot-yr M - - PowerPoint PPT Presentation

Public WH Design (Problem 24)

191

$/yr $/slot-yr slot 1 0,bldg ,bldg $/y

( ) Demand assumed uncorrelated since it belongs to different customers 1 2 2 250 0.06(250) 1 4,800 15 636,000 slots 2 2

N i i i i N

K b AC M M SS M SS IV SV K

=

= ⇒   −   = + +           −   = + + =         = ⇒

∑

r 0,bldg 0,bldg 0,bldg

0.05 $15.50 1.15 42 40 7 ( ) ( ) ( ) 2 12 12 2 i IV IV IV TA TA TA A TA D xL D yD L D D = = ′ ′ = ⇒ = ⇒     = ⋅ + = ⋅ + ⇒        

Public WH Design (Problem 24)

192

( )

*

( , ) 1 1 ( ) 2 2 1 1 636,000 4800 4800 2 2 18 18 5 (building clear-height constraint) 42 /12 2 7 2(636,000) 4 1 2 2 b cont D H M NH N L D DH H D H DH H z A M N D D NyH − −       + +       =         − −       + +       = ⇒             = = =           − −   = = + =    

( )

800 1 7 40 2 2(4800) (5) 12     + =        

Public WH Design (Problem 24)

193

0,bldg $/y $/yr r 0,bl $/slot-y dg r slot

( , ) 20,503 1,925,573 2,214,409 $15.50 $15.50(2,214,409) $34,323,346 0.05 $1,716 $2.70 ,16 per slot-yr 7 b cont L TA T K AC M A IV TA K IV ′ ⇒ = ⇒ = ⇒ = ⇒ ′ ⇒ = = = = = ⇒ = = ⇒

Public WH Design (Problem 24)

194

2 min/mov mov/yr tr hr/mov

( , ) 2,214,409 ft 2 2 2,214,409 2,104 35 2 4.58 616 60 2(8)5(50) 4000 hr/yr (already using ) 2,000,000 1.25 1.25 625 mov/hr 4000 1 1

SC SC peak a e peak

a cont TA d TA d t H H f r H m r t r t ′ = ⇒ ′ = = = ⇒   = + =     ′ = = = = = ′ = + = +    

( ) ( )

10

4.58 625 1 48 tr 60 1 35,000 0.25(35,000) 1 0.05 $29,628

N eff

IV IV SV i

− −

  = + =         = − + = − + =

Public WH Design (Problem 24)

195

( ) ( )

tr/yr 10 lab $/lab-yr min/mov lab $/yr tr $/tr-yr tr $/lab-yr

( , ) 0.05 29,628 $3,837 1 (1 ) 1 (1 0.05) 15.00 $60,000 12 2.75(2,000,000) 60 48(3,837) 48 12 60,000 2.75(2,000,00

eff N

a cont i K IV i c H t TC m K m c

− −

    = = =     − + − +     ′ = = = + + + = + + +

$/yr $/mov mov/yr

4,204,2 4.58 0) 60 $4,204,286.27 86.27 $2.10 per move 2,000,000 TC AC f = = = ⇒ =

Public WH Design (Problem 24)

• (c) What are other costs that should be added to each charge

to better reflect the true costs of each activity?

– most significant missing costs are the facility non-move-related

• perating costs, which should be added to the slot-year charge
• What about average unit cost of $46.75?

– only possible impact of unit cost would be for any insurance coverage provided by the warehouse for items stored in the warehouse

• Note: Number of slots of max inventory, M, used to determine

AC$/slot-yr instead of the total slots in warehouse since unused HCL slots would underestimate cost:

196

Total Slots = 717,605 636,000 81,605 L D H M HCL × × = = =