运营管理复习资料公式整理
inventory
WIP
flow time
little's Law
inventory turns
per-unit inventory cost
y% per-unit inventory cost capacity(For whole process) capacity(correlated to resources) capacity(1 kind of Resources) Flow rate
Flow rate（How to get）
utilization
implied utilization
Time to finish X units
Labor Content
cost of direct labor
cycle time
Idle time
capacity(batch size,set up time) recommended batch size
Economic order quantity Stationary
Poison
Exponential
CV
utilization
Time in queue(Tq)
Time in queue(Tq)
Flow time
Ip(inventory in service)
Iq(inventory in queue)
I(inventory in the system) average labor utilization
F(Q)
Expected Lost Sals
work-in-process
one unit from in to out
Average inventory = Average flow time * Average flow rate
1/flow time = COGS/inventory
annual inventory cost/annual inventory turns;y% * annual inventory cost
x% annual inventory cost/ annula inventory turns
max flow rate
add for multiple resources for one activity，minimum（resources capacity）Number of Resources/Processing Time
min{available input，demand，capacity}
flow unites/unit of time，COGS（cost of goods sold）
flow rate/capacity
demand(work load)/capacity
Time（Empty Process）+ X-1 unit/ Flow rate
sum of processing time with labors
(total wages/ unit of time )/ (flow rate / unit of time)
1 / flow rate
cycle time - processing time of a single worker
batch size / (setup time + batch size * processing time)
flow rate * setup time /(1 - flow rate * processing time)
sqrt（2 * setup cost * flow rate / holding cost）
一段时间内到达一次的概率 1/a
一段时间内到达x次的概率
两次到达间隔的概率 average inteval time = a
standard deviation / mean
(1/a)/(m/p) = p /( m * a )
processing time * (utilization /(1 - untilization)) * (cva^2 + cvp^2) / 2 (processing time / m) * (utilization^(sqrt(2(m+1))-1) /(1 - untilization)) * (cva^ p + Tq
m * u
(1/a)/(1/Tq) = Tq/a
Iq+Ip
labor content/labor content + sum
Cu / (Cu + Co)
sigma * L(Z) Norm
sigma * L(s) Poison
include WIP balance sheet
throughput rate earning statement
batch size ↑-> inventory ↑
Q* = sqrt(2 * K * R / h)
p-processing time a-interarrival time m- number of servers
(cva^2 + cvp^2) / 2
u-utilization