Wiesiek Tomac is the Logistics Manager of
Piotr Hucek Transport in Prague, Czech
Republic. Every month he designs, or
updates, the aggregate plan to cover the
next 6 months. He starts with forecasts of
monthly demand for different types of
transport, and collects other relevant information
to design outline schedules for each
type of transport for each month. At the
beginning of 2001 he had the following
information for one type of transport.
Month Jan Feb Mar Apr May June
Forecast 80 100 125 130 150 75
These figures are in nominal ‘truck journeys’,
and the company uses euros for
internal costs. These main costs are:
■ Spare transport that is not used = g1000
a unit held at the month end
■ Shortage of transport = g10,000 a unit
at the month end
■ Cost of moving an employee to this
function from other jobs = g1000 per
employee
■ Cost of moving an employee from this
function to other jobs = g700 per
employee
At the beginning of the period 16 people
were employed, each of whom can make 5
journeys a month.Wiesiek has a spreadsheet to help with
aggregate planning. He looks at the existing
plans, and then makes adjustments to
allow for changing circumstances. The
spreadsheet does the associated calculation,
but little else. Figure 6.11 shows how
he developed an initial idea.
As you can see, Wiesiek started by looking
at a smooth supply, set at the average
demand over the six months. This needed
six more employees, so there were costs for
transferring people into the function in the
first month. Other costs came from the
unused demand in the first four months
and shortage in month five. The shortage
cost was particularly high, so Wiesiek kept
looking for alternative plans until he had a
reasonable solution. His obvious next move
was to reduce availability of vehicles in the
first four months, and then increase it later.
When he finalised an aggregate plan,
Wiesiek moved on to design the master
schedule. This showed the supply of vehicles
of each type by week. Finally, shortterm
schedules were designed to show
what each individual vehicle and driver
would be doing each day.
Wiesiek Tomac is the Logistics Manager ofPiotr Hucek Transport in Prague, CzechRepublic. Every month he designs, orupdates, the aggregate plan to cover thenext 6 months. He starts with forecasts ofmonthly demand for different types oftransport, and collects other relevant informationto design outline schedules for eachtype of transport for each month. At thebeginning of 2001 he had the followinginformation for one type of transport.Month Jan Feb Mar Apr May JuneForecast 80 100 125 130 150 75These figures are in nominal ‘truck journeys’,and the company uses euros forinternal costs. These main costs are:■ Spare transport that is not used = g1000a unit held at the month end■ Shortage of transport = g10,000 a unitat the month end■ Cost of moving an employee to thisfunction from other jobs = g1000 peremployee■ Cost of moving an employee from thisfunction to other jobs = g700 peremployeeAt the beginning of the period 16 peoplewere employed, each of whom can make 5journeys a month.Wiesiek has a spreadsheet to help withaggregate planning. He looks at the existingplans, and then makes adjustments toallow for changing circumstances. Thespreadsheet does the associated calculation,but little else. Figure 6.11 shows howhe developed an initial idea.As you can see, Wiesiek started by lookingat a smooth supply, set at the averagedemand over the six months. This neededsix more employees, so there were costs forโอนย้ายบุคคลเป็นฟังก์ชันในการเดือนแรก ต้นทุนอื่น ๆ มาจากการความต้องการใช้ในสี่เดือนแรกและขาดแคลนในเดือนห้า การขาดแคลนต้นทุนไม่สูงโดยเฉพาะ เพื่อเก็บ Wiesiekหาแผนสำรองจนกว่าเขามีการโซลูชันที่เหมาะสม ถัดไปของเขาชัดเจนคือการ ลดความพร้อมของยานพาหนะในการสี่เดือนแรก และจากนั้น เพิ่มในภายหลังเมื่อเขา finalised แผนการรวมWiesiek ย้ายในการออกแบบกำหนดการ นี้แสดงให้เห็นว่าการจัดหายานพาหนะแต่ละชนิดตามสัปดาห์ สุดท้าย shorttermออกแบบมาให้แสดงตารางยานพาหนะแต่ละและควบคุมทุกสิ่งจะสามารถทำแต่ละวัน
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