English scheduling microclase

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s.C

SCHEDULINGIng. JUAN ANGEL CHICA URZOLA, Esp. Ms.C.

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OBJETIVOS• Identificar los conceptos de relacionados con scheduling y su

ámbito.

• Proporcionar al estudiante los elementos necesarios para que diseñe una estrategia de programación de tareas en cualquier tipo de empresa considerando sus expectativas de competitividad.

• Mostrar las diferentes decisiones estratégicas y tácticas que existen en el ámbito de la programación de la producción y las operaciones para alcanzar la competitividad de las empresas.

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PREGUNTAS• ¿Qué entendemos por Scheduling?• ¿Cuáles son los principales elementos presentes en el

Scheduling?• ¿Qué aplicaciones tiene en el mundo actual empresarial?• Cuáles son los casos esenciales que conforman el scheduling?• ¿Cuáles son los tipos de estructuras y modelos?• ¿Qué impacto tienen en la gestión empresarial?• ¿Qué aplicaciones puede tener el scheduling en la gestión de

las operaciones de una organización y la futura vida profesional del estudiante?

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¿QUÉ ES?

Scheduling is a decision-making process that is used on a regular basis in many manufacturing and services industries. It deals with the Allocation of resources to tasks over given time periods and its goal is to optimize one or more objectives.

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Framework• In all the scheduling problems considered the number of jobs

and the number of machines are assumed to be finite. The number of jobs is denoted by n and the number of machines by m.

• Usually, the subscript j refers to a job while the subscript i refers to a machine.

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• 1st case: n jobs 1 machine

• 2nd case: n jobs 2 machines

• 3th case: n jobs m machines ( n≥⩝ 3)

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Notation• Processing time (pij) The pij represents the processing time of

job j on machine i. • Release date (rj ) The release date rj of job j may also be referred

to as the ready date. It is the time the job arrives at the system, i.e., the earliest time at which job j can start its processing.

• Due date (dj) The due date dj of job j represents the committed shipping or completion date (i.e., the date the job is promised to the customer). Completion of a job after its due date is allowed, but then a penalty is incurred.

• Weight (wj) The weight wj of job j is basically a priority factor, denoting the importance of job j relative to the other jobs in the system.

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Classes of Schedules

In scheduling terminology a distinction is often made between a sequence, a schedule and a scheduling policy. • A sequence usually corresponds to a permutation of the n jobs or

the order in which jobs are to be processed on a given machine. • A schedule usually refers to an allocation of jobs within a more

complicated setting of machines, allowing possibly for preemptions of jobs by other jobs that are released at later points in time.

• The concept of a scheduling policy is often used in stochastic settings: a policy prescribes an appropriate action for any one of the states the system may be in. In deterministic models usually only sequences or schedules are of importance.

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Classes of Schedules• FIFO: First In First Out

• LIFO: Last In First Out

• SPT: Shortest Processing Time

• EDD: Earliest Due Date

• PS: Priority Scheduling

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EXAMPLE• INPUT DATA

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Ptij

nj Rj DDj Wj m1 m2 m3

A 1 08-abr-13 2 11 1 12

B 2 12-feb-13 1 12 14 11

C 3 08-dic-12 4 15 9 9

D 4 24-abr-13 3 10 13 8

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FIRST CASE: n Jobs 1 Machines

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• FIFO:

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Ptijnj Rj DDj Wj m1 m2 m3A 1 08-abr-13 2 11 1 12B 2 12-feb-13 1 12 14 11C 3 08-dic-12 4 15 9 9D 4 24-abr-13 3 10 13 8

Order j1 2 3 4

PTijnj in out

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• LIFO:

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Order j1 2 3 4

PTijnj in out

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• SPT:

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Order j1 2 3 4

PTijnj in out

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• EDD:

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Order j1 2 3 4

PTijnj in out

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• PS:

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Order j1 2 3 4

PTijnj in out

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SECOND CASE: n Jobs 2 Machines

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• FIFO:

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Order j1 2 3 4

PTij (M1) PTij (M2)

nj in out in out

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• LIFO:

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Order j1 2 3 4

PTij (M1) PTij (M2)

nj in out in out

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• SPT:

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Order j1 2 3 4

PTij (M1) PTij (M2)

nj in out in out

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• EDD:

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Order j1 2 3 4

PTij (M1) PTij (M2)

nj in out in out

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• PS:

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Order j1 2 3 4

PTij (M1) PTij (M2)

nj in out in out

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THIRD CASE: n Jobs m Machines

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• SPT:

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Order j1 2 3 4

PTij (M1) PTij (M2) PTij (M3)

nj in out in out in out

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ACTIVITY

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Independent Homework

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Additional Reading

• PINEDO, Michael L. Scheduling Theory, Algorithms, and Systems. Ed. Springer.

Or Select National and InternationalJournals such as:

1. International Journal of Production Research,2. International Journal of Production Economics,3. International Journal of Supply Chain Management,4. International Journal of Quality & Reliability Management,

5. International Journal of Computers Integrated Manufacturing6. European Journal of Industrial Engineering,7. Journal of Advances in Management Research,8. Asian Academy of anagement Journal,9. Computers & Industrial Engineering,10. Journal of Engineering Manufacture,11. Logistics Information Management.

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English scheduling microclase

Engineering

Transcript of English scheduling microclase