scholarly journals Computation of quantity of spare parts by the failure frequency

Author(s):  
A. N. Tynynyka

One way to increase the level of reliability is to create sets of spare parts, units, devices to be efficiently replaced in the failed system. System availability ratio is very important for consumers. It depends on the ability to quickly replace a failed component. In order for this system to support function at the proper level, effective management of these spare parts reserve is required. Therefore, acquisition of spare parts is rightly considered as a particular problem of the theory of inventory management, the solution of which is important for ensuring service continuity of a system and, in a number of cases, for achieving the required safety. The unpredictability of failure of equipment and its parts has a great impact on this problem. One way to reduce the level of unpredictability is to maintain a sufficient number of spare parts, which leads to an increase in the cost of inventory. A cheaper way is to estimate the necessary spare parts using one of the available forecasting models. Because of this unpredictability, the nature of the demand for spare parts is stochastic, thus the models that establish an unchanged quantity of spare parts for the entire life cycle of the product only depending on the number of equipment in operation do not always provide satisfactory estimates. For this reason, it is preferable to use the models dealing with the estimation of the required number of spare parts based on such parameters as reliability of spare parts, complexity and quality of service, life expectancy, intensity of operation, maintenance costs, etc. Based on the analysis of reliability and failure rate of technical systems, the required number of spare parts is estimated in this article at the time of the expected failure or when reliability falls below a predetermined level. With the help of the obtained formula, calculations can be made for single sets of spare parts for repair, maintenance and adjustment.

2022 ◽  
Author(s):  
monireh Ahmadimanesh ◽  
Alireza Pooya ◽  
Hamidreza Safabakhsh ◽  
Sedigheh Sadeghi

Abstract Inventory managers in the blood supply chain always seek timely and proper response to their customers, which is essential because of the perishability and uncertainty of blood demand and the direct relationship of its presence or non-presence with human life. On the other hand, timely and regular delivery of blood to consumers is vital, as the weakness in delivery and transportation policies results in increased shortages, returns, blood loss and significant decrease in the quality of blood required by patients. Given the significance of this for the blood transfusion network, the paper tried to design a comprehensive and integrated optimal model of blood transfusion network logistics management by blood group to reduce the cost of losses, returns and blood shortages. This model is divided into two parts: Inventory management and routing. A combination of simulation techniques and neural network with several recurrent layers was used to evaluate the optimal inventory management and a multi-objective planning model was designed to determine the delivery and distribution of blood to consumers. The model designed was implemented in Khorasan Razavi Blood Transfusion Network with a main base, six central bases and 54 hospitals. Solving the model led to estimating the f consumer demand, the optimal value of target inventory and re-ordering point of central bases and hospitals, and blood distribution from the supplier to its consumers that decreased the units of blood returned to bases, increased inventory availability, and reduced costs significantly.


2020 ◽  
pp. 34-39
Author(s):  
Т.Б. Лейберт ◽  
Э.А. Халикова ◽  
О.В. Кадесникова

Важным аспектом в современной системе управления запасами в компании является информационно-аналитическое обеспечение как базовая информационная основа, которая формируется в корпоративной учетной системе, обрабатывается, интегрируется в формате управленческих отчетов, на основе которых принимаются оперативные и стратегические управленческие решения. Научная статья посвящена проблеме учетно-аналитического обеспечения формировании и использовании запасов на предприятиях в условиях меняющегося законодательства. Основой эффективного управления запасами является информационно-аналитическое обеспечение, которое основано на грамотной классификации запасов и их оценке. Авторами статьи предложена группировка запасов материально-технических ресурсов в зависимости от их категории. Разработана схема управления запасами материально-технических ресурсов в зависимости от потребности в материально-технических ресурсах на планируемый год. Проанализирован порядок формирования себестоимости запасов в зависимости от способов их поступления с учетом изменений учетного законодательства, внесенных ФСБУ 5/2019 «Запасы» и оценено влияние на качество учетно-аналитического обеспечения. An important aspect in the modern inventory management system in the company is information and analytical support as the basic information basis, which is formed in the corporate accounting system, processed, integrated in the format of management reports, on the basis of which operational and strategic management decisions are made. The scientific article is devoted to the problem of accounting and analytical support for the formation and use of reserves at enterprises in the context of changing legislation. The basis for effective inventory management is information and analytical support, which is based on a competent classification of reserves and their assessment. The authors of the article proposed a grouping of stocks of material and technical resources depending on their category. A scheme for managing stocks of material and technical resources has been developed, depending on the need for material and technical resources for the planned year. The procedure for the formation of the cost of inventories was analyzed, depending on the methods of their receipt, taking into account changes in accounting legislation introduced by FSBU 5/2019 "Inventories" and the impact on the quality of accounting and analytical support was assessed.


2013 ◽  
Vol 694-697 ◽  
pp. 3412-3418 ◽  
Author(s):  
Jun Liu ◽  
Tian Jiang

Spare parts are a kind of protective materials for normal equipment maintenance and emergency treatment. Effective management of spare parts can not only guarantee the continuity and safety of production, but also improve the productivity. Firstly, the paper summarized the characteristics of spare parts and current problems existing in their management. Then it established the collaborative management model of spare parts around procurement management and inventory management of spare parts. Finally, the paper proposed the operation mode of collaborative management based on e-marketplaces – the third-party e-marketplace. Furthermore, there provided the functions and operation process of the third-party e-marketplace. Third-party e-marketplaces can realize the collaborative management of procurement and inventory through integrating members of the company alliance in horizon and associating suppliers with purchasers in vertical.


2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Jing Cai ◽  
Yibing Yin ◽  
Li Zhang ◽  
Xi Chen

Under the background of the wide application of condition-based maintenance (CBM) in maintenance practice, the joint optimization of maintenance and spare parts inventory is becoming a hot research to take full advantage of CBM and reduce the operational cost. In order to avoid both the high inventory level and the shortage of spare parts, an appointment policy of spare parts is first proposed based on the prediction of remaining useful lifetime, and then a corresponding joint optimization model of preventive maintenance and spare parts inventory is established. Due to the complexity of the model, the combination method of genetic algorithm and Monte Carlo is presented to get the optimal maximum inventory level, safety inventory level, potential failure threshold, and appointment threshold to minimize the cost rate. Finally, the proposed model is studied through a case study and compared with both the separate optimization and the joint optimization without appointment policy, and the results show that the proposed model is more effective. In addition, the sensitivity analysis shows that the proposed model is consistent with the actual situation of maintenance practices and inventory management.


Author(s):  
Hanna Zaporozhets ◽  
Alkhatib Faisal

The article analyzes the methodological approaches to making adaptive management decisions in construction, taking into account European quality standards for construction products. It was found that the civilizational choice of Ukraine, its main priority of domestic and foreign policy is full-scale integration with the European Union. The «4M» methodology is presented, which directly connects quality management with the use of the whole arsenal of management methods and management decision-making options. It is noted that one of the most important factors in the quality of construction products is effective inventory management, which reduces the duration of the production and the entire operating cycle reducing current costs for their preservation and freeing from current economic turnover of funds by reinvesting them in other assets. Ensuring this efficiency is achieved through the development and implementation of financial policies for inventory management. Emphasis is placed on the fact that one of the modern methods of making adaptive management decisions on the quality of construction products is benchmarking. Its’ application is based on the characteristics of quality management systems, guided by international and national quality management standards. Benchmarking tools have been found in order to make effective management decisions and gain a lasting competitive advantage. It is concluded that taking into account European standards the solution of effective management decisions by the construction companies’ product quality management, is based on the use of operational, marketing and economic tools that address the strategic development of construction companies in Ukraine. In turn, the path chosen by the economy of Ukraine indicates the need to comply with European standards of construction work quality, which is significantly complicated by the current state of domestic production systems.


2010 ◽  
pp. 108-117 ◽  
Author(s):  
I. Smotritskaya ◽  
S. Chernykh

The article analyzes the conceptual framework of public procurement system as an integral part of public regulation to ensure effective management of public resources. The authors consider the problems of transition to a new "quality" of the procurement system, increasing its innovative activity. They put forward proposals for institutional framework and mechanisms of regulating procurement, meeting the needs in innovative upgrading and modernization of the Russian economy.


Author(s):  
Nur Maimun ◽  
Jihan Natassa ◽  
Wen Via Trisna ◽  
Yeye Supriatin

The accuracy in administering the diagnosis code was the important matter for medical recorder, quality of data was the most important thing for health information management of medical recorder. This study aims to know the coder competency for accuracy and precision of using ICD 10 at X Hospital in Pekanbaru. This study was a qualitative method with case study implementation from five informan. The result show that medical personnel (doctor) have never received a training about coding, doctors writing that hard and difficult to read, failure for making diagnoses code or procedures, doctor used an usual abbreviations that are not standard, theres still an officer who are not understand about the nomenclature and mastering anatomy phatology, facilities and infrastructure were supported for accuracy and precision of the existing code. The errors of coding always happen because there is a human error. The accuracy and precision in coding very influence against the cost of INA CBGs, medical and the committee did most of the work in the case of severity level III, while medical record had a role in monitoring or evaluation of coding implementation. If there are resumes that is not clearly case mix team check file needed medical record the result the diagnoses or coding for conformity. Keywords: coder competency, accuracy and precision of coding, ICD 10


2017 ◽  
pp. 139-145
Author(s):  
R. I. Hamidullin ◽  
L. B. Senkevich

A study of the quality of the development of estimate documentation on the cost of construction at all stages of the implementation of large projects in the oil and gas industry is conducted. The main problems that arise in construction organizations are indicated. The analysis of the choice of the perfect methodology of mathematical modeling of the investigated business process for improving the activity of budget calculations, conducting quality assessment of estimates and criteria for automation of design estimates is performed.


2015 ◽  
Vol 6 (1) ◽  
pp. 50-57
Author(s):  
Rizqa Raaiqa Bintana ◽  
Putri Aisyiyah Rakhma Devi ◽  
Umi Laili Yuhana

The quality of the software can be measured by its return on investment. Factors which may affect the return on investment (ROI) is the tangible factors (such as the cost) dan intangible factors (such as the impact of software to the users or stakeholder). The factor of the software itself are assessed through reviewing, testing, process audit, and performance of software. This paper discusses the consideration of return on investment (ROI) assessment criteria derived from the software and its users. These criteria indicate that the approach may support a rational consideration of all relevant criteria when evaluating software, and shows examples of actual return on investment models. Conducted an analysis of the assessment criteria that affect the return on investment if these criteria have a disproportionate effort that resulted in a return on investment of a software decreased. Index Terms - Assessment criteria, Quality assurance, Return on Investment, Software product


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