In the batch production, the use of a single machine for several stages of the processes will result in waiting time of production batch to be long. It will cause an increase in work in process (WIP) inventory cost. CNC-machining centre is a type of CNC machine that can carries out several stages of processes singly. In some cases, this machine is often single used to make a product through several stages of processes, from raw material to end product. One of the reasons to use a single machine is to avoid transfer from one stage (machine) to next machine. However, single use causes inventory to accumulate due to long waiting times. The objective of this research is to reduce the WIP inventory cost at the CNC-machining centre. Scheduling to minimize WIP inventory cost is done through two steps. First step, divide number of stages of processes to be assigned to m serial CNC-machining centers. Second step, determine transfer batch size is smaller than the production batch size to be transferred to the next stages. The results of this research indicate that there is a reduction in WIP inventory cost by 53.47 percent. Scheduling multi-stage batch production on m machines with small transfer batch size will reduce WIP inventory cost.
Garbage, on the one hand, is an environmental problem, but on the other hand, it can give the potential economically. One indication of it there are IS activities that collect certain types of waste as recycled materials and then sold to the recycling industry. This research aims to determine the role of IS of solid waste management (SWM) in Bandung municipality. The study used mixed method research, which is a combination of qualitative and quantitative. The results of this study concluded that the estimated number of scavengers as IS in Bandung municipality is about 3990 people, and contributed to the reduction of waste about 6, 8% of the total solid waste generation. As economically, the average income of IS is IDR 1 million/person/month. Considering the role of IS both in SWM contexts and in economic contexts, the government must be to make a policy to integrate the IS with SWM. Base on the AHP methods, this study recommended that to integrated IS of SWM can be developed by facilitating them at TPS/TPS 3R.The implication of the strategy that the existence of IS will be more organized and reduce waste generation to the maximum.
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