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Efficient resource management methods are essential for spare parts used in the maintenance and repair of equipment. Forecasting plays a critical role in planning, especially under demand uncertainty. Existing works regarding spare parts with intermittent demand focus on the mere forecasting model while integrating the planning and forecasting models are not sufficiently investigated. We examine the interaction between two models to optimise planning and forecasting decisions and prevent sub-optimality. This paper presents two mathematical models, including a planning model that determines stock level, spare part order assignment to suppliers, equipment repair assignment, and the number of intervals over the planning horizon. The second model is the forecasting model by Support Vector Machine (SVM). Considering uncertainty, demand estimation is performed by piecewise linearisation considering the optimal number of intervals in the planning model used in forecasting. An interactive procedure is developed to optimise models. We use an empirical investigation from an oil company providing the spare part supply chain data. The analyses show that demand estimation by piecewise method and integrating the decisions optimises the cost, improves the forecasting accuracy, and planning performance. Moreover, we offer several insights to practitioners that shed light on spare part planning and forecasting decisions. [ABSTRACT FROM AUTHOR]

The purpose of the research is to develop a software simulation multi-product model designed for effective inventory management of spare parts. In the course of the work, a mathematical model was used to optimize the production and storage of spare parts for vehicles. At the same time, such significant factors as the total number of spare parts in stock, the frequency of failure of certain parts, operating conditions, the intensity of their use, as well as the influence of the human factor were taken into account. The results show that penalties for shipping and dynamic spare parts consumption significantly affect the cost function, while penalties for missing necessary parts significantly affect the minimum inventory level. The results can be applied to the management of spare parts stocks at authorized service centers. The study concludes that seasonal fluctuations in demand for spare parts can be eliminated by creating a scientifically sound spare parts inventory management system.

Experimental studies of force plunge grinding were carried out to obtain the components of cutting forces and temperature in the contact zone of the grinding wheel with the workpiece. Experimental data were obtained on the dependence of cutting force and temperature in the contact zone of a part and the grinding wheel during power plunge grinding on the transverse feed and rotation speed of a part. [ABSTRACT FROM AUTHOR]

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PT. XYZ is a multinational company manufactured semi-finished raw materials of cocoa commodities. The continuity of the production process is very imporant in terms of ensuring that customers will receive a timely supply according to the schedule. The technology for processing the cocoa product in general is still produced by the oversea companies, especially from European countries. To support the production process, the procurement of spare parts for routine maintenance (preventive maintenance) plays an imporant role. Because procurement of the spare parts still involves the original equipment manufacturer company directly from the oversea company, the determination of incoterms will affect impor costs which will be borne by the seller or buyer depend on the agreement. These costs will also consider risk handling of impored the goods. Based on data obtained, the determination of incoterms at PT. XYZ in procuring spare parts for production machines still follows the incoterms proposed by the seller along with the submission of the price of spare parts. In this research, an analysis will be carried out on selecting the right incoterms based on incoterms 2020 covering aspects of cost and risk that can be used by PT. XYZ for making decisions to impor the spare parts in the next order.

This study examines user outsourcing of spare parts management to vendors through a service contract. The user's selection of a fixed-price service parts contract is formulated as a stochastic integer programming model that decides multiple response times and on-site spare parts, while considering component breakdown with uncertain failure rates. We analytically derive the optimality conditions for the continuous case and subsequently design an efficient algorithm. Numerical illustrations and analyses are conducted to evaluate decisions under various scenarios. Our analysis shows that when both failure rate and expedited contract cost are high, coupled with low part cost, users would prefer the purchase of spare parts for all components to expedited contracts. A fixed-price expedited contract has a lower marginal cost with respect to failure rate than a fixed-price next day contract and a usage-based contract. We also examine inventory behaviour for a single part, multiple types of parts, and multiple groups of parts. It is shown that there is a cost-saving pooling effect in spare parts for identical items, which significantly raises the likelihood of having on-site stored parts. The problem becomes more complex for multiple items, reflecting bundling effects between items for a given contract. [ABSTRACT FROM AUTHOR]

The medial plantar flap is frequently used in heel reconstruction and has been described since 1969. We took care of a 25-year-old patient with a bilateral ballistic trauma and open fractures to the distal third of both legs. Given the seriousness of the damage to the left lower limb, a trans-tibial amputation had to be performed. Concerning the right lower limb, we decided to cover the defect with a spare part's free medial plantar flap thanks to the amputated fragment. The extremity spare tissues principle is already known and described, more particularly concerning hands, in emergency traumatic surgery and in planned surgery, mainly concerning thumb reconstruction, for example for hypoplasia or after traumatic amputation. Apart from an article on the use of foot spare part in the coverage of amputation stumps, no article has reported the use of a foot spare part in reconstructive surgery, even more in traumatic surgery. We believe that the use of an extremity spare tissues should be considered in rare cases where this is possible, in order to reduce donor-site morbidity in the context of reconstructive surgery. [ABSTRACT FROM AUTHOR]

Copyright of Systems Engineering & Electronics is the property of Journal of Systems Engineering & Electronics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

One of the large automotive companies usually faced more spare part availability issues in international business compares to domestic business. So, the objective of the study is to check the forecasting accuracy of international spare part business in comparison with domestic spare part business in the concerned company. In this paper, the researcher has collected domestic as well as international spare part order data from one of the large automobile manufacturers to compare the spare part forecasting accuracy in both businesses. Due to its spike's nature of orders in international business, it is difficult for spare part inventory planners to forecast the appropriate quantity. In this research, it is found that spare part forecasting accuracy is lesser accurate in international spare part business compares to domestic spare part business. The researcher compares the order deviations, some parts in fast-moving & medium moving category, a spike in different part categories, first fill ratio & MAPE values for both the businesses to arrive at conclusion. [ABSTRACT FROM AUTHOR]

Currently,the domestic civil aircraft lacks of the rational and flexible calculation model of spare parts price,and the suitable sale cost decomposition structure model of spare parts can reduce the operation cost and increase the returns.The pricing of spare parts is studied from different dimensions in this paper by synthesizing the effects of various factors.The components of civil aircraft spare parts cost are elaborated.The influencing factors of spare parts price are analyzed from the perspective of life cycle.The decomposition structure model of sales expenses of domestic civil aircraft is established with different spare parts in the life cycle.The results show that the constructed decomposition model is reasonable and effective,and can guide the pricing analysis of spare parts for domestic civil aircrafts.The analysis of influencing factors of spare parts sales price can decompose the cost in the whole life cycle in combination with different department dimensions or working dimensions to maximize profits.

Dalam memprediksi persediaan barang banyak metode yang dapat dilakukan antara lain yaitu dengan melakukan pengolahan data penjualan menggunakan metode Data Mining yang disertai dengan algoritma apriori didasarkan pada proses pembelian yang dilakukan oleh konsumen berdasarkan keterkaitan antar produk yang dibeli. Dengan menggunakan algoritma apriori pihak perusahaan dalam hal ini adalah Regional Part Depo Auto 2000 Palembang dapat menyediakan spare part yang dibutuhkan oleh konsumen khususnya dilingkungan Sumatera Selatan tanpa harus melakukan proses indent hal ini dikarenakan banyaknya jumlah spare part yang harus di sediakan oleh PT. Depo Toyota guna melayani kebutuhan konsumen di lingkungan Sumatera Selatan. Adapun tahapan data mining yang di gunakan yaitu Knowledge Discovery in Database (KDD) yang terdiri dari proses data cleaning and integration, data selection and integration, data mining, evaluation and prentation. Dari proses diatas didapat pola keterkaitan spare part sebanyak 646 dari jumlah spare part sebanyak 338.

Availability is an important indicator of the impact of spare parts on the integrity of the equipment. It is difficult to establish the availability model wtth regard to the impact wtth critically key availability on equipment availability. In this paper, we take the radio interference cancellation equipment of shipboard communication station as the object, and adopt the expert scoring method for the key parts of the spare parts. This paper takes the key of spare parts as one of the constraints of spare parts optimization, and establishes spare parts allocation optimization model constrained by spare parts cost, spare parts volume and spare parts key Based on the normalization of spare parts cost, volume and key, the weight factor method is used to transform method of weigh presented. Examples are given to compare the cost constrains, volume constrains and multiple constrains. What is more, the spare parts allocation scheme before and after improvement is compared, and spare parts support in the use of equipment is extended to the equipment reliability design stage. The results show that the spare parts allocation method not only takes into account the constraints of volume and cost, but also considers the influence of the key of spare parts on the availability of equipment, which makes the decision making department more reasonable; in the design of equipment reliability, it is possible to effectively reduce equipment maintenance support resources by improving weaknesses such as LRU (line replaceable unit) with a low reliability. [ABSTRACT FROM AUTHOR]