Mehdi Izadyar; Abbas Toloie Eshlaghy; Mehri Zahra
Volume 25, Issue 1 , April 2021, , Pages 1-24
Abstract
Improving sustainability in supply chains is one of the strategic objectives in the current business. Firms have been adopted new management strategies to achieve sustainability in the manufacturing supply chain. Therefore, it is essential to assess the sustainability performance of the newly implemented ...
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Improving sustainability in supply chains is one of the strategic objectives in the current business. Firms have been adopted new management strategies to achieve sustainability in the manufacturing supply chain. Therefore, it is essential to assess the sustainability performance of the newly implemented management strategies. The purpose of this paper is to provide a model for assessing the sustainability performance of LARG supply chain management practices in the automotive supply chain using the dynamics system. In this paper, LARG supply chain management practices was identified by reviewing the literature and interviewing experts and were prioritized using fuzzy DEMATEL and fuzzy analysis network process and was presented as an integrated approach to LARG practices. Finally, the dynamic system has been used to assess the dynamics of LARG supply chain management practices and their impact on sustainable performance in the supply chain. The findings show that improved scenarios flexible transportation and just in time lead to a more sustainable supply chain. The results of these scenarios show sustainability improvement in the supply chain Also the results show that lean strategy is a very important for achieving sustainability in the supply chain. The proposed model helps industry managers and decision makers to identify the results achieved from implementing LARG supply chain management practices and improving effective practices on sustainability in the supply chain by adopting policies.
Seyed Hossein Hosseini; Hamed Shakouri G.; Aliyeh Kazemi
Volume 22, Issue 3 , December 2018, , Pages 133-158
Abstract
An examination of international political economy history shows that discovery of huge oil reservoirs has been playing an important role in defining and supporting the countries national interest. Undoubtedly, oil reserves in Iran are considered as intergenerational resources and maintaining intergenerational ...
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An examination of international political economy history shows that discovery of huge oil reservoirs has been playing an important role in defining and supporting the countries national interest. Undoubtedly, oil reserves in Iran are considered as intergenerational resources and maintaining intergenerational justice as well as enhancing national interest in the long run. These are indisputable commitments which are the main goals and missions of Iran governors. In this research, focusing on the economic aspect of the national interest and by using systems dynamic methodology, dynamics changes of Iran’s national interest are modelled considering developments in the oil industry and market. The structure of production capacity formation, amount of production and revenues of domestic and international sale of oil and oil products are investigated and modeled and variables related to economic national interest are formulated. Simulation results described in five scenarios as follows: growth in the oil market, current status, downturn in the oil market, OPEC market share target, and OPEC revenue target. According to results, increase in domestic prices of energy carriers to international prices and the increase of the budget share for investment in more value added areas in the oil industry are recommended to increase national economic benefits.
Ali Mohamadi; Habibollah Ranaee; Abbas Abbasi; Hossein Karami
Volume 21, Issue 2 , September 2017, , Pages 89-112
Abstract
It is important to identify sources of industrial investment growth from policy planning perspective, due to importance of manufacturing industries as the engine of economic development. SME formation is one of these sources that its impact on investment process with various methods has been studied. ...
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It is important to identify sources of industrial investment growth from policy planning perspective, due to importance of manufacturing industries as the engine of economic development. SME formation is one of these sources that its impact on investment process with various methods has been studied. However, each of these studies used their specific angle and in some cases, these studies have reached different conclusions. On the other hand, many of the previous studies have applied statistical approaches and short-term, medium-term and long-term consequences of the solutions that have proposed by these studies has not considered at the same time. Therefore to address this deficiency, the holistic approach (system thinking) used to study impact of SME formation on investment growth. System Dynamics (SD) method used as a tool for implementing system thinking approach in order to use its capabilities in complex systems modeling and for achievng suitable results from simulation model. The population is Fars province in Period of 1360-1410. Vensim software has used for modeling and simulating. The results from the simulation of designed model showed, there is direct and interactive relationship between SME formation and amount of industrial investment.
abbas moghbel baerz; zdel azar; Ameneh jhadivar; mansooreh zarezadeh
Volume 19, Issue 2 , August 2015, , Pages 1-29
Abstract
As regard the increasing complexity and challenging problems at today organization demand developing suitable decision models. This research is aimed at utilizing whole systems approaches at better implementation strategy in this regard due to their power in resolving complex and dynamic organizational ...
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As regard the increasing complexity and challenging problems at today organization demand developing suitable decision models. This research is aimed at utilizing whole systems approaches at better implementation strategy in this regard due to their power in resolving complex and dynamic organizational issues, and also responded some of shortcomings of existing in other strategy implementation models and methods. Since all systems methodologies are inherently restricted to determined problem domains, using total systems intervention (TSI) meta-methodology to strategic development road map, because it is totality and capability to use several system methodologies in combination. By proposed road map has made methodologic process for strategy formulation and implementation and also reached learning organization and scheming culture by applying appropriate system methodologies. Also this road map smoothly decreases the gaps between strategic and function layers in organization by ensuring a consensus between stakeholders and actors. According to the phase of TSI, at first, barrier of strategy implementation were investigated then soft systems methodology (SSM) and system dynamics (SD) selected as chief methodologies, by way of applying SSM, determine functional strategy and SD prioritize strategies, and resource allocation. The end phase, TSI was at public organization implemented, and the initial steps of road map were explored. At the end, proposed system model and final road map for strategy implementation with ten steps and two main action and investigated that`s validity. The action plan and system of performance indicators were reached via utilizing this road map in public organization.
hadise khodadadi; zeinab mohammadiani; alimohammad ahmadvand
Volume 19, Issue 2 , August 2015, , Pages 31-52
Abstract
Sustainable development has become a major concern for policy makers and planners in the world today. Sustainable development is composed of three main aspects: environmental, economical and social. transportation has significant economical, social and environmental impacts, and is an important factor ...
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Sustainable development has become a major concern for policy makers and planners in the world today. Sustainable development is composed of three main aspects: environmental, economical and social. transportation has significant economical, social and environmental impacts, and is an important factor in sustainability. urban transportation system is a complex system with multiple variables and nonlinear feedback loops. Transportation can not be rated as an independent criteria.This article aims to present a dynamic model for urban transportation system concerning sustainable urban transportation in a way that by using this model the complicated and dynamic nature of urban transportation system will be understood and the impact of policies will be analyzed. So the best has been done in the article using systems dynamic approach, a completed and integrated Model for Tehran transportation system be introduced considering sustainable urban transportation system concept and the system dynamic conduct be analyzed. In continue some policies have been introduced by model simulating in order to increase urban transportation system utility and urban traffic parameters improvement. This model has been analyzed in vensim software using the data from Tehran. Results show that compound performance of presented policies has a great impact on urban transportation systems and Tehran traffic parameters improvement.
sima javaheri; amene khadivar
Volume 19, Issue 1 , July 2015, , Pages 117-146
Abstract
To encounter with Knowledge Management, the organizations should select appropriate knowledge strategy and knowledge management strategy. There are different methods for developing these strategies. In this study a System Dynamics model developed to select and integrate both strategies. In the proposed ...
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To encounter with Knowledge Management, the organizations should select appropriate knowledge strategy and knowledge management strategy. There are different methods for developing these strategies. In this study a System Dynamics model developed to select and integrate both strategies. In the proposed model organizational factors such as business strategy, structure, culture, human resource and IT infrastructure have been considered. On the other hand, from the dynamic approach perspective, the knowledge creation processes and the level of explicit or tacit knowledge have direct impact on selected strategies. In this paper all the stock variable and their initial value have been identified then the flow variable and theier increasing/decreasing rate have been determined and casual loops and stock and flow diagrams was proposed. At last after simulating and testing the dynamic model, different scenarios and policies have been presented for the case study. The results indicate improvement in both KM strategy and knowledge strategy. Keywords: knowledge management, knowledge management strategy, knowledge strategy, system dynamics
Sayyed Abbas Ebrahimi; Adel Azar; Hossein Safari; Ahmad Jafarnejad
Volume 18, Issue 4 , January 2015, , Pages 23-42
Abstract
One of the most important functions of manufacturers and producers related to supply chain management issues and decisions is supply chain order management. However, there are several problems in this regard like (a) selection of best order portfolio between the received orders, and (b) detailed and ...
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One of the most important functions of manufacturers and producers related to supply chain management issues and decisions is supply chain order management. However, there are several problems in this regard like (a) selection of best order portfolio between the received orders, and (b) detailed and accurate calculation of order fulfilling costs. Accordingly, in order to increase model confidence in the research, we used both mathematical optimization and system dynamics to design the order management system of an Automakers Company supply chain orders. In phase 1, using the mathematical optimization approach, we determined optimum order portfolio of the received supply chain. In phase 2, using phase 1 output and system dynamics approach, we determined the costs of order fulfillment. Both traditional and activity-based costing techniques were used to calculate cost parameters and objects. Ultimately, in order to select better costing approach, we compared the two approaches. According to the results, ABC is better costing approach than traditional.
Nyma Lotfi Foroushani; Meisam Rajabi Nahooji; Ali Rezaeian; Hamidreza Fartookzadeh
Volume 18, Issue 2 , July 2014, , Pages 55-84
Abstract
There are too many different reasons for organizational project failures. Non-supportive management, internal resistance, and situational changes can be mentioned as some of the most important reasons. In formation sciences (IS) projects follow the same rules. Because of their considerable effect ...
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There are too many different reasons for organizational project failures. Non-supportive management, internal resistance, and situational changes can be mentioned as some of the most important reasons. In formation sciences (IS) projects follow the same rules. Because of their considerable effect on the quality and quantity of organizational output, this article tries to propose some solutions to minimize the probability of such failures in Iranian organizations. Informatics Services Corporation (ISC) as the largest e-banking company in Iran has been chosen as the case of study. Vensim software (Version 9) was applied to simulate the real situation available in ISC. By testing different solutions, it was conducted that the most effective ones are: continuous training, establishing sustainable management systems via process clarification and procedure deployment, helping to ameliorate contactors' financial condition, and clear written contractual relations instead of verbal agreements in all phases of the projects. The major advantage of this article is its concentration on project gap.
ahmad rajabi; Mohammad Hashem Moosavi-Haghighi Moosavi-Haghighi
Volume 17, Issue 3 , September 2013, , Pages 87-111
Abstract
Appraisal and calculate productivity of the industrial groups with applying of system dynamics approach in 1404 horizon. In this paper, industrial productivity was calculated in 1404 horizon with usage of system dynamics model. For this purpose, with regard to behavior of the effective variables and ...
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Appraisal and calculate productivity of the industrial groups with applying of system dynamics approach in 1404 horizon. In this paper, industrial productivity was calculated in 1404 horizon with usage of system dynamics model. For this purpose, with regard to behavior of the effective variables and data of 1380 to 1388 years, the productivity model was designed and simulated.The result showed industrial productivity from 1380 to 1388 years always decreasing and this trend because increasing input production, will be continuing from 1389 to 1396 years, but from 1396 to 1404 horizon this trend will be increased. It should be noted that the productivity of the manufacturing process, labor productivity is lower fluctuation from than capital and energy. With regard to role of industrial productivity in value added, the appraisal of policy changes showed that increase of 1% annual productivity rate in industrial sector in 1404 with ratio to bas year, lead to increasing 3.5%.value added
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Volume 16, Issue 3 , September 2012, , Pages 39-58
Abstract
The use of System Dynamics Modeling in Supply Chain Management has only recently re-emerged after a lengthy slack period .the propose of this thesis is to use knowledge and techniques in implementation based on recent research .At first we have given an overview of supply chain management and system ...
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The use of System Dynamics Modeling in Supply Chain Management has only recently re-emerged after a lengthy slack period .the propose of this thesis is to use knowledge and techniques in implementation based on recent research .At first we have given an overview of supply chain management and system dynamics and then presented a taxonomy of research and development in System Dynamics Modeling in supply chain management. In this research we have focused on a supply chain as a case study Which produce and distribute healthy products and its main company is darugar. we used System Dynamics techniques to know effective variables in our supply chain and understand how to improve its performance .we started simulation model design by explaining dynamic hypothesis and continued by creating casual loops, stock & flow diagrams and mathematical formulation .our model was tested by famous dynamics and statistical techniques and then we started to investigate causes of supply chain’s behavior by sensitivity analyses. when we understood the main factors and their interactions completely we started to suggest three policies due to supply chain indexes to improve its performance .the policies are missed sale reduction ,inventory reduction and correct information receive which all causes improvement in introduced indexes in our research .what we achieved of this research was our ability of predicting results before any changes in parameters ,relationships or structure of supply chain and it is so important due to its high degree of complicity.
Mohammad Reza Sadeghi Moghadam; Amir Afsar; Babak Sohrabi
Volume 10, Issue 20 , June 2006, , Pages 212-226
Abstract
Among flows in every supply chain (finance, information, and material), material flow according to its part in product cost is very important. Many studies in the field of material flow showed that material flows are often single level. This study offers a comprehensive model for appropriate order assignment ...
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Among flows in every supply chain (finance, information, and material), material flow according to its part in product cost is very important. Many studies in the field of material flow showed that material flows are often single level. This study offers a comprehensive model for appropriate order assignment in different levels of supply chain according to minimizing related cost to with genetic algorithm method. Results based on genetic algorithm is compared to other common pattern search methods such as Latin Hypercub and Mead-Nelder. The evidence shows that genetic algorithm method is the best method among other methods.
Ali Mohaghar; Ali Morovati Sharif Abadi
Volume 10, Issue 20 , June 2006, , Pages 269-292
Abstract
Just in Time (JIT) production systems are introduced for production and supply of goods and services with minimum inventory. The goal of this paper is present a sample of system dynamics modeling application for analysis and improvement of JIT system's behavior. In this paper relations between demand ...
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Just in Time (JIT) production systems are introduced for production and supply of goods and services with minimum inventory. The goal of this paper is present a sample of system dynamics modeling application for analysis and improvement of JIT system's behavior. In this paper relations between demand of products, quality of produced goods, inventory, maintenance of machines and facilities, production rate and supplier's efficiency are investigated in a dynamic system. In the first section problem definition, dynamic hypothesis, causal diagram and flow diagram of system are discussed. Afterwards behavior of the model is inspected from different views by developing a dynamic model.
