Question 2.1. What are the five typical physical units-of-measure in which product is handled in a warehouse? For each unit-of-measure, state whether there are any standardized dimensions and, if so, identify them.
Question 2.2. In what ways has the inventory process depicted in Figure 2.5 been idealized?
Question 2.3. What are the advantages and disadvantages of dedicated (reserved) storage? Of shared (random) storage?
Question 2.4. Why is random storage (shared storage) likely to generate more space efficiency in a pallet storage area than where cartons are stored directly on shelves?
Question 2.5. Consider a SKU that has been allocated more than one location within
a warehouse that is organized by “shared storage”.
Question 2.6. In real life a certain amount of safety stock may be held in a storage location to guard against stockout while awaiting replenishment to that location (which would interrupt order-picking). How would this affect the average utilization of storage space?
Question 2.7 (Harder). What value of space utilization would you expect to observe if you showed up at random to examine storage at a warehouse using shared storage?For simplicity, consider a single SKU that is stored in k locations of identical size. Assume an idealized inventory process such as depicted in Figure 2.5 and assume that all picks are directed to the location that is most nearly empty.
Prove that the expected space utilization under the model above (random sampling) is never greater than the mean space utilization.
Where is the difference in the mean and expected mean values greatest? Explain how this difference arises.
Question 2.8. Your third-party warehouse has space available for 10,000 pallets and you have 20 forklift operators per 8-hour day for 250 working days a year. If the average trip from receiving to storage to shipping is 10 minutes, how many inventory turns a year could you support for a full warehouse? (Answer: 24 turns per year).
Question 2.9. Your third-party warehouse is bidding for a contract to store widgets as they are manufactured. However, widgets are perishable and have a shelf life of 30 days. The manufacturer produces at an average rate of 20 pallets per day. Suggest an upper bound on the number of pallet positions reserved for widgets. (Answer: 600 pallet positions)
Question 2.10. A pallet storage facility holds about 10,000 pallets in storage. Arrivals and departures are handled by 7 forklift operators and the average forklift travel time from receiving to a storage location and then to shipping is about 6 minutes. Estimate the inventory turns per year. Assume each driver works 8 hours per day for 250 days of the year.
Question 2.11. Suppose a dairy distributor, experiencing approximately constant demand for each SKU, ships an average of 200 pallets per day. If, on average, there are approximately 1,000 occupied pallet positions, how long must the shelf life of its product be to avoid spoilage? (Answer: 10 days)
1 answer
问题2.1.在仓库中处理产品的五个典型的物理度量单位是什么?对于每个度量单位,请说明是否有尺寸标准,如果有,请说明。
问题2.2.图2.5中描述的库存变化过程在哪些方面被理想化了?
问题2.3.专用(预留)存储的优点和缺点是什么?那么共享(随机)存储?
问题2.4.为什么在托盘存储区域,随机存储(共享存储)可能比将货箱直接存储在搁板货架的空间利用率更这高?
问题2.5.考虑有这样一个SKU,它在一个仓库中分配了多个库位,该仓库是按照“共享存储”组织的。
允许从任何或所有存储库位取货的优/缺点分别是什么?
只允许从一个存储库位取货的优/缺点分别以是什么(在库位没空之前,只允许这个货位取货)?
问题2.6.在现实生活中,在库位中可能需要有一定数量的安全库存,以防货未补货时缺货(缺货将导致拣货作业中断)。这将如何影响存储空间的平均利用率?
问题2.7.(较难)如果随时走进一个使用随机存储策略的仓库中,你对当时空间利用率水平有什么期待?为了简单起见,只需考虑一个SKU,被存储在k个相同大小库位中,并假设它是一个如图2.5所示的那样理想化的库存变化过程,还假设拣货都是采用逐货位清空原则。
证明上述模型(随机抽样)中的期望空间利用率不会大于平均空间利用率。
平均值和期望平均值的差在哪里最大?解释这种差异是如何产生的。
问题2.8.你的第三方仓库有10,000托存储能,你还有20个叉车工,每天工作8小时,一年有250个工作日。如果从收货>入库>发货的平均路程要10分钟,如果利用上全部存储能力,您能支持一年的库存周转率是多少?(答案:每年24次)。
问题2.9.您的第三方仓库正在竞标一份合同,以便在生产的时候存储小部件。但是,小部件容易腐烂,保质期为30天。制造商平均每天生产20托。请建议为这些小部件最大预约多少托的库位能力?(答案:600托)
问题2.10.一个托盘库大约有10000托存储能力。入库和出 库由7个叉车工处理,叉车从收货到储存地点再到发货的平均时间约为6分钟。请估算每年的库存周转率。假设每个司机每年工作250天,每天工作8小时。
问题2.11.假设有这样一个乳制品分销商,对每个SKU的需求大致稳定,平均每天发运200托。如果库内平均有大约1000托存储能力,它的产品保质期必须是多长才能避免出现超期?(答案:10天)
This guy is lazy,Introduction has not been set