4-12
Reliability is a situation that a product will show its function normally for a reasonable length of time. Maintainability is the cost of repairing or maintaining a product or service. Reliability and Maintainability are two important things to measure how good about the product or service. If a product has reliability and maintainability in same time, that will be a great product. Philishave has both reliability and maintainability. I can use Philishave for 10 years and maintain good functions. It is easy and lower cost to repair the damaged Philishave since that is assembled to modules and easy to disassemble.
4-13
Simplification can reduce the number of parts in order to give the design more possibility and flexibility. Standardization saves design time, tooling costs and production worries that can improve design.
Modular design can help the product achieve the cost benefits of standardization without losing the market advantage of variety and uniqueness and modelar design combines standardized building blocks, or modules, to make unique finished products.
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The elements of the queuing system are the calling population, arrivals, servers and the queue.
5-12
Hair salon: single-server model, queue discipline, the calling population is infinite.
Bank: multiple-server model, queue discipline, the calling population is infinite.
Laundromat: single-server model, not queue discipline, the calling population is infinite.
Doctor’s office: single-server model, queue discipline, the calling population is finite.
Adviser’s office: single-server model, queue discipline, the calling population is finite.
Airport runway: multiple-server model, queue discipline, the calling population is finite.
Service station: multiple-server model, not queue discipline, the calling population is infinite.
Copy center: multiple-server model, not queue