فصلنامه مدیریت زنجیره تامین
پیاپی 77 (زمستان 1401)

The existence of a proper system for machine maintenance is an effective factor in the proper operation of the machine and reduction in maintenance costs. Condition-based maintenance, which is actually the most efficient method of maintenance, is done with different methods, the most important of which is the oil analysis method. In the oil analysis method, the properties and different materials resulting from the erosion and degradation of the oil of different parts of machines such as engine, gearbox, hydraulics, etc. are examined. The analysis of the results of different oil tests is based on the allowed amounts of erosion particles and other characteristics and components in the oil. The basis of the oil analysis is to represent the exact state of the active machine in a certain period of time. In this paper, with the approach of theoretical and field studies and using the information of more than 3000 construction machines, some ranges of functional indicators of the results of oil analysis are presented to reduce breakdowns and increase the efficiency of machines.</em>

Today, the high importance of achieving food security for communities has made it necessary to provide a new perspective on the design of the grain supply chain distribution network to better adapt to real-world uncertainties and also to take into account disruptions. To this end, in this study, a mixed-integer linear programming model has been developed for the distribution network design problem in the grain supply chain, which has three objectives such as minimizing costs and maximizing job opportunities, both of which are examples of sustainability. In addition, considering the importance of grain in the food basket of households and the importance of food security, the third objective function has been developed focusing on the issue of resilience to deal with any disruption in the design of the distribution network. The robust-possibilistic programming approach is used to deal with uncertain demand and the multi-objective problem is solved using the improved epsilon constraint method. Finally, a compromised solution is selected using the TOPSIS method.</em>

In the present era, the management and control of sustainable supply chains, in the global dimension, seems difficult. Blockchain technology, as a digital computing technology that ensures transparency, traceability and security, can help in providing a sustainable supply chain management solution. The purpose of this research is to design a sustainable supply chain model based on the blockchain approach in the steel industry, which has been carried out in the steel factories of Kerman province. The current research is applied-developmental in terms of its purpose and descriptive-survey in terms of data collection. The statistical population of the current research is 18 experts of the steel industry. The sample was randomly selected by snowball method and semi-structured interview was used to collect the data. Indicators were also extracted based on previous studies in the field of blockchain effectiveness on sustainable supply chain and fuzzy cognitive mapping method was used. Therefore, 15 factors affecting the sustainable supply chain were identified and investigated based on the blockchain approach. The results showed that the environmental performance improvement factor has the highest centrality with 6.844 degrees and the transparency factor has the lowest centrality with 0.958 degrees. Also, improving the environmental performance had the most impact and the most effectiveness. According to the results of this research, managers are advised to pay special attention to the emerging blockchain technology for performance transparency, cost reduction, increased trust in transactions and better security</em>.</em>

This research was conducted with the aim of achieving the performance of the green supply chain based on the organizational culture and with the mediation of green innovation in seafaring of the Navy of Islamic Republic of Iran warships. The research method in this study is descriptive-survey in terms of practical purpose and in terms of data collection method. It included all senior officers of the middle and high levels of the Strategic Navy of the Islamic Republic of Iran (Nadaja) in the number of 170 people, who were selected by simple random sampling method using Morgan's table, the number of 118 people. The data collection tool consisted of three standard questionnaires of green organizational culture, green supply chain performance and green innovation. The face and content validity of the questionnaires were confirmed and their reliability was calculated as 0.87, 0.86 and 0.77, respectively, based on Cronbach's alpha. The data analysis method was carried out using structural equations and by Lisrel software. The findings indicated that achieving the performance of the green supply chain in the maritime industry based on organizational culture and with the mediation of green innovation is positive and meaningful, and other research results are based on The positive and significant effect of green organizational culture on green innovation was also confirmed on the other hand, the effect of green organizational culture on green supply chain performance</em>

Designing supply chain networks is one of the concerns of pharmaceutical distribution companies, since these companies are forced to expand or redesign their branch locations due to national regulations or fierce competition. In this research, using an integrated approach, the issue of pharmaceutical supply chain design for distribution companies has been addressed in such a way that all costs including opening new branches, distribution of goods and inventory along with the requirements related to existing legal regulations have been presented in the form of a mathematical model. Specifically, in this research, the parameters affecting inventory cost of the entire company at the level of the supply chain were considered. Further, due to the complexity of the resulting model, a hybrid approach including clustering of demand points and meta-heuristic algorithms was used to solve it. In order to evaluate effectiveness, the model was applied to the data of Sina Pakhsh Gen Company. Finally, in several scenarios, optimal location of new branches, optimal level of inventory, and optimal distribution plan were investigated. Results show that an integrated approach to supply chain design will lead to reduction in total costs.</em> </em>

The purpose of the current research is to redesign and prioritize the maintenance strategies of Islamic Republic of Iran Army Ground Forces (IRIAGF) in order to realize the visions outlined in the statement document of the second phase of the Islamic Revolution in the form of the IRIAGF maintenance transformation plan document. In this regard, two main questions were raised and two hypotheses were presented in response to them. The statistical population of this research are experts in the field of maintenance in the military-defense sectors of the country. Sampling was done in a purposeful way and until the theoretical saturation was achieved using Delphi method, based on which the statistical sample size reached 20. It is also qualitative due to the discovery, understanding and description of the concepts of maintenance in the military-defense field and also the vision of the second step of the Islamic revolution. Considering that, this research, by presenting the 17 new strategies of the IRIAGF, adopted a developmental style and then by studying and measuring the intensity and size of the relationship between the two areas of " formulated strategies of the transformation plan of the IRIAGF maintenance" and "the vision outlined in the statement document of the second phase of the Islamic Revolution of Iran" and by focusing on the studied problem (IRIAGF) and performing statistical analysis (T and Friedman tests) by presenting reasoning, logic and analogy regarding the generalization of theories, it also took a quantitative dimension. The results indicate that the strategies of "increasing the coefficient of practical culture formation in the transformation of the concept of "repair and maintenance" into "maintenance and repair", "the need to fully align the maintenance goals of all units with the macro goals of IRIAGF in the fields of resistant economy and increasing parts service life" and Also, "Necessity of needs assessment, design and accurate training plan for IRIAGF maintenance employees" have the highest priorities in realizing the vision outlined in the document of the second phase of the revolution.</em> </em>

In today's world, technological advances are accelerating, and organizations are better prepared to deal with environmental change and enhance the impact of supply chain agility on performance by applying the various theories of a flexible manufacturing system. The present study examines the impact of flexibility on supply chain agility, company performance and competitive advantage with a resource-based view approach. The method of this research is applied and field research. The statistical population is all the experts, supervisors and managers of Abrah Dezhar production company. 128 people from the statistical population were selected by simple random sampling method using Morgan's table. To evaluate the validity of the questionnaire, the opinions of professors and experts were used. Cronbach's alpha value was used to determine the reliability of the questionnaires. In the present study, structural equations with partial least squares approach were used to analyze the hypotheses in the Smart-pls3.3.9 software and to evaluate the validity of the model, bootstrap approach was used in AMOS24 software. The findings of the research showed that production flexibility and strategic flexibility have an impact on the performance and agility of the company. Also, strategic flexibility did not affect the competitive advantage, while production flexibility had an impact on the company's competitive advantage by 0.994.</em>