2) System hierarchy refers to the organizational structure of a group of elements to achieve a particular goal. Each element is ranked according to importance levels and managed accordingly.
3) System life cycle is the cradle-to-grave journey of a system. In logistics, it is a series of stages that are worked on when developing a logistics system. The phases of the system life cycle are need, conceptual design, preliminary system design, detail design and development, production and/or construction, utilization and support, retirement and disposal. The need refers to the definition of the system and why it’s required. Through feasibility studies, the system requirements are developed where the design phases entail the planning of the system in order for it to meet its set requirements. The production/construction phase involves the development of the system which leads to the utilization and support phase where the system is operational and tested to verify its performance. The last phase is the retirement and disposal phase where the system is documented and maintained for recycling.
6) In the system life cycle, logistics is viewed from a total system perspective which includes activities throughout each phase of the system life cycle. Initially, early planning functions lead to the definition of logistics requirements (design phase). Subsequently, through synthesis and analysis and design trade-off studies, the logistics and maintenance support infrastructure is defined. Next is the acquisition of the logistics elements and the follow on implementation requirements in support of production activities, system operation/utilization in the field and the final retirement and item processing for recycling/disposal.
3) For a series network, the overall system reliability is
4) For a parallel network, the overall system reliability is
5) For a combined series-parallel network (figure 2.9 (c)), the overall...