【作者】 刘露；

【导师】 周剑岚；

【作者基本信息】 华中科技大学 ， 系统工程， 2016， 硕士

【摘要】 连续投料产出型生产企业是严格按照生产工艺进行生产,以贵金属生产为例,贵金属(铂、钯、铑)价值昂贵,生产过程中的一点差错,就会导致较大的损失。所以研究企业生产过程中贵金属的投入产出平衡非常重要。另一方面,如何科学地预测客户的真实需求以及原材料采购价格来设置安全的库存水平,值得研究思考。所以本文重点研究了生产过程投入产出平衡以及在需求不确定、原材料价格波动情况下库存管理问题,并以此为基础设计开发了贵金属生产管理信息系统。平衡查询和库存管理都是该系统的主要模块。贵金属投入产出平衡查询是一个网状结构的搜索过程,本文采用深度优先搜索与广度优先搜索算法来实现投入产出平衡查询,其中深度优先搜索涉及到正向、逆向的查找过程。最后将搜索结果进行比较分析,可判断投入产出过程是否平衡。同时,本文研究了原材料采购价格随机波动、需求不确定情况下库存管理问题,采用伊藤过程来预测原材料价格,二次指数平滑法来预测短期平均需求,建立了库存模型,目标函数是使得采购成本、持有成本以及缺货成本总和最小化,采用gamma分布近似来求得最佳的订货量。最后进行具体求解与分析。本系统是基于Asp.net技术,采用C#语言开发的web应用程序。我们分析了系统需求,然后进行了总体设计,功能设计,相应的数据库设计以及投入产出平衡设计。该系统特点是具有友好的前台界面,操作简单、稳定,易扩展。该信息系统可以稳定地在web服务器上运行,实现贵金属投入产出平衡以及为企业定制生产与采购计划,使得企业的生产流程信息化,数字化,提高工作效率,最终节约企业生产成本。更多还原

【Abstract】 Continuous input-output production enterprise is strictly in accordance with the production process for production, in precious metals production, for example, precious metals(platinum, palladium, and rhodium) have a high value and a little error in the production process will result in a greater loss. So the research of the input and output balance in the process of precious metals production is particularly important. On the other hand, how to scientifically predict the real needs of customers and the purchase price of raw materials to set a safe stock level, which is worth to research and think. So this paper focuses on the production process of input and output balance and the inventory management problem under the case of demand is uncertain, the raw material price fluctuations, and on this basis, a precious metals production management information system is designed and developed. The system is included by the module of balance query and inventory management.Input and output balance query of the precious metals production is a network structure of the search process. In this paper, depth first search and breadth first search process is used to realize the input output balance query, in which the depth first search is related to the forward, reverse search process. Finally, the search results are compared and analyzed to determine whether the input and output process is balanced.Simultaneously, this paper studies the problem of inventory management under the case of random fluctuations in raw material prices and uncertain demand, using the Ito process to predict the prices of raw materials, secondary exponential smoothing method is applied to forecast the short-term average demand, then the inventory model is established, the objective function is minimizing the sum of the purchase cost, holding cost and shortage cost, using the gamma distribution approximation to obtain the optimal order quantity. Finally, a numerical example is analyzed to solve the problem.The system is using C# language to develop the web application program based on ASP.NET. We analyzed the system requirements, and then carried out the overall design, functional design, the corresponding database design and input output balance design. The system is characterized by a friendly interface, simple and stable operation and easy to expand. The information system can be operated stably on the web server, to achieve a balance of the precious metal inputs and outputs, and customize for the enterprise production and procurement plans, which make the production process information, digitization, improving the work efficiency and ultimately saving the enterprise production costs.更多还原