جستجوی مقالات مرتبط با کلیدواژه « system dynamic » در نشریات گروه « مدیریت »

Nowadays, according to environmental issues and international agreements, countries have put the use of energy with less pollution in their agenda. One of the most important clean fossil fuels is natural gas. In recent years in Iran, there has been a shortage of natural gas in the cold months of the year due to the peak gas consumption in these months, especially in the domestic sector. One way to solve this challenge is to store natural gas either actively or passively. In this research, the LNG supply chain has been modeled using the system dynamics method and using Vensim software, and four different scenarios have been considered according to Iran's conditions. For these four scenarios, the modified amount of available natural gas is plotted. Also, according to the possibility of LNG export in the two scenarios mentioned, two modes have been considered for the sale price of natural gas according to long-term contracts (35 cents) and according to the sale of single cargo (70 cents).

Nowadays “Innovation” is a key factor for developing the countries and their societies. Between ecosystems, “Innovation Ecosystem” is an emerging issues in universities and industries, which facilitate the possibility of collaboration to activate knowledge transfer, support the technology acquisition, and promoting the innovative thinking and supporting the knowledge-based economic. There is a little research related to innovation ecosystem modeling which can make some difficulties for policy maker in policy research and strategic decision making, also there is no study in comprehensive conceptual model about Niroo (power and water industries) innovation ecosystem. Then in this study to overcome this deficiency, by systematic review of recent researches, we use meta-synthesis to analyze and combination of effective agents in innovation ecosystem and representing a comprehensive conceptual model.  In this research by reviewing prestigious journals and conferences related to subject theoretical basics by meta-synthetics method, main innovation ecosystem agents were identified then by Niroo innovation ecosystem experts, which were selected Purposefully, their attributes and functions, performance index and relationship between them is validated and finalized; based of those, a simplified model is modified to express the way of employing aforesaid contents by systems dynamic. So in four different scenarios, the variation of key performance of whole ecosystem is studied and relatively strategic propositions are represented.  Novelty of this paper is its integrity and comprehensive which assist power and water industries’ managers analyze and monitor their policies effects based in this model before their decision making and make strategic planning to drive each agent effectively

Proper design of management dashboards and according to the needs of users requires consideration of important and effective technical-engineering characteristics and the relationships between them. The aim of this study was to dynamically modelling of the strategic management dashboards and dynamic analysis of this model. For this purpose, out of 27 identified technical requirements for designing strategic management dashboards in the field of human resources management in NIOC, 17 items, based on the nature, importance and correlation between them in the house of quality model was selected as research variables and was used to build the problem model. The model was validated and different scenarios were examined and analyzed during several tests, including boundary adequacy test, structure evaluation, integration error, behavior reproduction, and sensitivity analysis. The research results indicate the confirmation of the model and the necessity of the existence of all variables and its reliability over time.

Aging on the size and composition of the workforce has an important role in economic growth, impact. Countries with low or declining fertility rates, with very little increase or decrease labor supply face. Negative effects on economic growth may reduce the number of employees and the public welfare is at the macro level. . In the institutes level this object featuring itself in different area such as increasing insurance costs, absence from work place, increasing wage costs and also at growing disjoin rate and losing knowledge. In this paper we first survey workforce composition trend in Iran .then with surveying impacts of this object in institutes performance, the strategy map is drawn based on interpretive Structural Modeling (ISM) and a cognitive map of gray dynamic scorecard approach and express a strategic overview at organizations human resources focused on composition of the workforce. Results were analyzed with using Pajek software and FC mapper, then the key factors in strategic plan were identified based on centrality

In recent years, the use and implementation of the closed loop supply chain has been important because of the improvement in corporate profitability, environmental issues and sustainable development. This has led to a wider range of research and articles in this area. Therefore, studying the effective factors and their impact level is a better understanding of the design of a closed loop supply chain. The main focuses of this paper is on the planning of production capacity, taking into account customer behavior and service on the level of returns in the supply chain. The purpose of this paper is to clarify the effective variables and how they approach each other in order to achieve the goals of the chain. So, first, there is an overview of the subject literature and the key variables of some of the papers have been identified. In the next step, by drawing the causal and nonlinear diagrams, the relationships of the variables were examined together and then determined by the flow diagram, state variables, and accumulation locations in the chain. Finally, the model has been validated and validated using dynamic modeling tests such as sensitivity analysis, boundary condition testing, etc.

Innovation is the corporate vitality and strategic pivot that plays an important role in the survival and prosperity of companies. Small and medium-sized enterprises are less active than large companies in open innovation due to their specific characteristics. The purpose of this article is to present a model of partnership structure for open innovation in small and medium-sized enterprises.

The present study is an exploratory study and in terms of type of use, is functional and the questionnaire has been used to collect data. In order to conduct research, 57 questionnaires were completed by experts working in small and medium-sized enterprises producing goods and services of ICT students. And by using the dynamics of the system, the design of the model has been addressed. The horizons of the research are from 1392 to 1397.

In this research, by designing an appropriate partnership structure, we seek to increase the aggregate profit of the network and the new small and medium-sized enterprise. In different scenarios, the behavior of the main variables of the model and the variables controlled by the partners and the network are discussed and their results are presented in the form of diagrams.

Research results make it possible for companies that create a collaborative structure for innovation by studying the investment in each of the cases affecting the model, analyze the changing trend of network profits.

Today, many activities have been outsourced, some of which have been successful and have continued, and some of them have been reversed because of failure. Therefore, it can never be claimed that outsourcing is, in itself, beneficial, unless outsourced activities are evaluated. Regarding the importance of the issue, the main objective of this research is to determine the extent to which the outsourcing goals are achieved and the probable improvements in the subscribers services sector of the water and wastewater company of Hormozgan province. In this research, the system dynamics approach is used to evaluate the outsourcing process. At first, after reviewing the theoretical literature and the experts’ opinions, key variables were indentified and causal relationships among these variables were depicted. Then, the mathematical relations among these variables were determined and, accordingly, the study system was simulated in Hormozgan province water and wastewater Company during the period 2001 to 2027. The findings showed that outsourcing reduces the number of employees, reduces the service provision waiting time and reduces costs in the subscriber services sector of the company. Finally, in order to improve outsourcing performance in line with outsourcing goals, some policies to improve suppliers’ performance evaluation and suppliers credit enhancement were proposed and the results of these policies were simulated.

A spatial data infrastructure (SDI) is the technology, policies, standards and related activities necessary to acquire, distribute, use and preserve spatial data. An SDI is a coordinated series of agreements on technology standards, institutional arrangements, and policies that enable the discovery and use of geospatial information by users and for purposes other than those it was created for. Modeling and simulation can facilitate the development of SDI system in different level. This study aims to model the development of local SDI in defensive organization using the system dynamics technique. In this regard, the spatial data management parameters were identified and then three indicators; data security, spatial data standardization and participation units were determined. The indicators were simulated by Vensim software and model validation tests were done using by three categories of model Validation: Structural, structural-oriented behavior and behavior pattern tests. These models can be analyzing the system behavior in different conditions. The results show that the priority of the indicators for planning and policy-making are data security, participation units and then defensive spatial data standardization. At the end the important scenarios for each index and strategies to improve them were presented in the defensive organization in the medium term future.

Water scarcity has become one of the most vital challenges in most countries around the world. Roughly0.5 million residents live in Arak, the capital of Markazi province of Iran. Because of the increasingwater demand and recent water shortages due to climate change, more water will be required in the city in the
future. Bridging the gap between supply and demand needs powerful management tools. In this study, Arakurban water system has been modeled using a System Dynamics (SD) approach. Employing dynamic modelingand the dynamic system analysis method, the present study was conducted to address the integrated waterresources management in Arak region taking advantage of a comprehensive outlook of the water resourcessystem in the region and implementing a behavioral simulation in the Vensim software. The Arak SD modelincludes water supply sources, demand sources (domestic, irrigation and industry use) and management tools (water price change, wastewater reuse, inter-basin water transfer, and, population reduction). Model simulationfor different scenarios investigates the influence of installingconservative fixtures, leak detection and reformation of the water supply network. The model has proven to be useful for Arak’s urban, and its is applicable to other cities, especially those in arid or semi-arid regions

Understanding the characteristics of an organization during different stages of its lifecycle help us make appropriate decisions at each stage in order for solving any problem. Employing the PAEI framework proposed by Adizes, and the system dynamics approach, we have analyzed the characteristics and behavior of an organization during the go-go and adolescence stages of its lifecycle. Moreover, using the system dynamics analysis approach, we have plotted the causal feedback loops and stock-and-flow diagrams of each stage of the organizational lifecycle. Then, the output of the simulations of 100 months of the go-go and adolescence stages of the organizational lifecycle performed in the VENSIM software are obtained .Finally appropriate strategies have been proposed for tackling the problems that the organization may face in each stage of its lifecycle.

Knowledge-based companies need to pay more attention to the challenges of the new products development process due to their knowledge-based nature. Given the importance of these companies in the development of countries' economies, this research examines the new products development (NPD) process in these companies. Firstly, the relationships between the factors were evaluated using the DEMATEL technique and the degree of importance of each factor were determined. Results indicate that the most important factors affecting the time of incubation phase included: customer requirements, rework, and delay in the onset of the phases of NPD. These factors have the highest impact on increased time and costs in the processes of knowledge-based companies and share of knowledge has the highest impact on customer requirements and rework. Therefore, considering the accurate knowledge management, which is associated with the share of knowledge, is of paramount importance. The results of DEMATEL demonstrate that the level of complexity of a new project had the most impact on delays in moving from one stage to another due to the fact that complexities require more coordination. Also the dynamic model of NPD process shows the effect of these factors in each stages of the incubation phase.

Due to organizations variant environment and because of today’s competitive business, creating economic value added is consider as a main goal of organizations. Therefore using these value based concepts, are getting more critical among top managers. Balanced Score Card (BSC) as a standard framework which is including all factors that affects on organization performance can be used for calculating value. System Dynamic (SD) also used as a means for increasing effectiveness of Balanced score card, (Karl,2007). Thus BSC model based on dynamic simulation can simulate organization’s future behavior with desirable scenarios and finally choose more efficient strategy for implementation. In this paper an effort has been made to use dynamic BSC and at the same time benefited from European foundation for quality management (EFQM) indicators which is annually evaluate and examined and value created factors was driven with viewpoints and experts advise. After that creating dynamic hypothesis was done and we identify cause and effect relation between four aspects of balanced score card model, thus final model based on cause and effect relations was collect and after finalizing a model, different scenarios that help us reaching total value was done, and then the best scenarios for achieving further value was demonstrated

Management and performance assessment has been provided as a critical tool to the management of the organization and in order to survive and develop in a competitive environment, the organizations require their own assessment and management performance. Various performance models have been designed and explained from the past to the present and each one has specific features. In addition to investigating performance models and their features from the past to the present we deal with investigating the effect of the management approaches on the formation of these models. Management approaches which have developed under the effect of environmental, organizational and various other factors over time, have influenced designing performance models and have caused evolution and transformation of the relevant performance models. The suitability of the management approaches and the performance models have been investigated in this study and the dynamics of this effect has been considered in the relevant mappings. In this paper, according to some studies, the impact of four major approaches of management (traditional approach, human resource approach, quantitative approach and systemic and contingency approach) using the dynamic methodology on the formation of performance models, their evolution and status have been considered and it is observed that the managerial approaches have developed and evolved under the influence of environmental and organizational variables and have led to the formation and evolution of performance models in order to meet organizational and environmental needs.

Occupational health and safety Environmental (HSE) management systems have a unique role in sustainable development of Hazardous Industries. Performance measurement and management is one of the managers challenges in recent years this. The aim of this research is to develop a dynamic approach to HSEperformance management. To achieve the mentioned goal in the first step H3SEperformance excellence evolutional trendwas assessed. Then, based on statistic H3SE PE, a dynamic model was developed. Finally H3SEmaturity in Petrochemical Industries level with regard to criteria interaction and casual relationships. The research findingimplies on safety performance evaluation model evolutional trend. But the main challenge of managers is to coordinate H3SE subsystems. Since the performance evaluation models mechanism is based on quantitative methods and principles; define criteria's importance and casual relationship among them needs quantitative methods.

Growing older is affecting on the size and composition of the workforce that has an important role in economic growth. the Countries with low or declining fertility rates, facing with a very little or maybe decrease in labor supply. Reduce in the number of employees may have negative effects on economic growth and public welfare at the macro level. In the institute's level, this object features itself in the different area such as increasing insurance costs, absence from a workplace, increasing wage costs and also at growing disjoins rate and losing knowledge. In this paper, we first survey the workforce composition trends in Iran. Then with surveying impacts of this object in Institute's performance with using logic of balanced scorecard model and drew the dynamic relation between structures and surveying the impacts of this changes and expresses a strategic overview at organization's human resources focused on composition of the workforce.

Future study as a research field is a newfound concept that rapidly opens their place in our schools and universities around the world. Chaos theory also is a newfound theory that in recent years has a significant impact on physics, mathematics, and even social sciences. Ahead article after explaining some of the essential concepts and literature, reviews deal with the futurestudy in the context of chaos theory. This study from purpose is theoretical form and from methodological view point is analytic. In this paper two methods- quantitative and practical introduce.

This paper presents a discrete simulation model of the auto spare parts supply chain based on the system dynamics approach. The studied chain has two levels and consists of two firms: a retailer (central repair shop) and a wholesaler (Isaco). This chain model is simulated in order to develop the order policies based on reorder point on two levels of central repair shop and Isaco. The developed model is a nonlinear mathematical model which is simulated by the vensim software. The purpose of simulation exercise is to analyze performance of the auto spare parts’ distribution system and to predict chains’ performance improvements with proposed strategies.