Efficient aircraft spare parts inventory management under demand uncertainty

In airline industries, the aircraft maintenance cost takes up about 13% of the total operating cost. It can be reduced by a good planning. Spare parts inventories exist to serve the maintenance planning. Compared with commonly used reorder point system (ROP) and forecasting methods which only consider historical data, this paper presents two non-linear programming models which predict impending demands based on installed parts failure distribution. The optimal order time and order quantity can be found by minimizing total cost. The first basic mathematical model assumes shortage period starts from mean time to failure (MTTF). An iteration method and GAMS are used to solve this model. The second improved mathematical model takes into account accurate shortage time. Due to its complexity, only GAMS is applied in solution methodology. Both models can be proved effective in cost reduction through revised numerical examples and their results. Comparisons of the two models are also discussed.     

浅析机电设备管理及技术维修

新时期,随着我国各工业、民用建筑单位生产工作的机械化、自动化以及技术化水平的不断提升,机电设备发挥的作用日益增加,并逐步成为各单位正常运行的关键性决定因素。因此,近年来,技术研究人员以及管理人员针对机械设备问题展开的研究逐步增多,为机电设备的管理与维修提供了优秀的经验。文章以机电设备为主题,着重探讨了开展管理以及技术维修工作的策略、方法。     

农村家电市场的差异化营销策略的选择与实施

差异化是人们进入竞争白热化市场的切入点,同时也是人们从跟随者转变成挑战者的机会点。产品只有形成自己独特的个性或需求点,才具备较强的竞争力。针对农村市场的需求特征,实施差异化营销策略不仅能满足广大农村居民的需求,而且能使企业有的放矢地在农村拓展＂领地＂,进而促进企业的发展。     

机房计算机不开箱维护技术

通过制作并口电缆、串口电缆以及网线等方法 ,利用 GHOST软件 ,在不打开机箱的情况下 ,对机房中装有硬盘还原卡和未装硬盘还原卡 ,以及有网卡和无网卡的计算机进行维护的技术     

收益还原法在物业维修经济分析中的应用探讨

物业维修是人们越来越关注的领域，其中的经济性分析一直没有一种较好的方法来解决。收益还原法在物业估价中的应用已比较成熟，其原理在物业维修经济分析中有较好的适用性，且基于其原理的物业维修经济分析法也有较好的可操作性。     

Role of Endogenous Vintage Specific Depreciation in the Optimal Behavior of Firms

This paper studies the firms' capital accumulation process in a vintage capital model with embodied technological change. We take into account that depreciation is endogenous and in particular associated with vintage specific maintenance expenditure. We prove that maintenance is a local substitute for investment as soon as the marginal cost of maintenance is strictly increasing. We show that maintenance and investment in new capital goods appear as complements with respect to the changes in productivity, cost of maintenance, fixed cost of operation, efficiency of maintenance services and appear as substitutes with respect to the price of new machines. Allowing for investment in old vintages, we determine that investment in old machines appears as a substitute of both investments in new machines and maintenance services. We end up by analyzing the effects of technological progress on optimal plans and prove that a negative anticipation effect can occur even without any market imperfections.     

汽车维修制度的现状及思考

通过对汽车维修体制现状的分析,阐述了维修制度改革的必要性及重要性。对计划修体制向状态修体制过渡进行了探讨。最后对维修体制建设若干问题作出了积极的思索。     

非晶态Ni—P化学镀液的维护及不良镀层的退除

本文介绍了非晶态 Ni—P 化学镀液的维护和不良镀层的退除。     

刍议玻璃幕墙施工维护

文章论述了玻璃幕墙施工管理的难点、质量控制措施及使用维护中存在的问题,并提出了改善玻璃幕墙使用维护的措施.     

制药设备维修实训室文化建设实践探索

实训文化是职业教育校企合作的窗口,也是培养学生职业素养的重要场所。制药设备维修实训室是药剂设备制造与维修、药物制剂技术、中药制药技术专业的实训场所,从物质文化、制度文化、精神文化和行为文化四个方面构建了具有专业特色的实训文化,并在实践教学过程中探索出一条发挥实训文化作用,培养职业素养的新途径。