13 production systems of a housing (50 units) project in Mexico over 235 days

Study using 13 production systems of a housing project in Mexico over 235 days. The production systems are divided into two groups: Case A and Case B. Case A gathers six production systems and Case B seven. In both cases, the production systems are arranged in a way that the output of a system is the input of the subsequent system as in a queuing system. The inputs/outputs are jobs that comprehend in a few activities assigned to a crew. For instance, the crew assigned to the job ja0 should complete the foundation, excavation, and backfill of each house. Once the crew finishes ja0 of the house, it moves to the next house leaving room for the next crew, which was assigned to ja1, and so on until all the 50 houses are completed. For this example, ja0 is the input of the production system A1, and ja1 is the output.

本研究针对墨西哥某住宅项目中的13个生产系统进行了235天的观察与分析。这些生产系统被划分为两组：案例A和案例B。案例A包含六个生产系统，而案例B包含七个。在两种情况下，生产系统均按照排队系统的方式排列，即一个系统的输出成为下一个系统的输入。输入/输出为各类工作，这些工作涵盖了分配给一支队伍的若干活动。例如，负责工作ja0的队伍应完成每座房屋的基础、挖掘和回填工作。一旦队伍完成房屋的ja0工作，他们将前往下一座房屋，为下一支队伍（负责ja1工作的队伍）腾出空间，如此循环，直至完成全部50座房屋的建设。以本例而言，ja0是生产系统A1的输入，而ja1是输出。