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Manajemen Operasi [2] September 14, 2008

Posted by desrinda in Manajemen Operasi.
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Process Analysis Terms

Process: Is any part of an organization that takes inputs and transforms them into outputs.
Cycle Time: Is the average successive time between completions of successive units.
Utilization: Is the ratio of the time that a resource is actually activated relative to the time that it is available for use.

Process flowcharting is the use of a diagram to present the major elements of a process.

These basic elements can include:
– tasks or operations
– flows of materials or customers
– decision points
– storage areas or queues.
It is an ideal methodology by which to begin analyzing a process.

On multi-stage process:
BUFFERING
Refers to a storage area between stages where the output of a stage is placed prior to being used in a downstream stage.  Buffers allow stages to operate independently. Work-in-process (WIP) inventory will accumulate in the buffer.
NO BUFFERING
Blocking:
Occurs when activities in a stage must stop because there is no place to deposit the item just completed.
Starving: Occurs when the activities in a stage must stop because there is no work.

Process Performance Metrics
Operation time = Setup time + run time
Cycle time = Average time between completion of units
Throughput rate =  1 : cycle time
Throughput time = Average time for a unit to move through the system*

Operations time = waktu di mana terjadi proses value adding (nilai tambah sebagai hasil proses).

* Note: Little’s Law computes throughput time while in (work-in-process) inventory only.

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