scholarly journals Decision making in reverse logistics using system dynamics

2004 ◽  
Vol 14 (2) ◽  
pp. 259-272 ◽  
Author(s):  
P. Georgiadis ◽  
D. Vlachos
Keyword(s):  
Decision Making ◽  
System Dynamics ◽  
Reverse Logistics ◽  
Closed Loop ◽  
System Modeling ◽  
New Approach ◽  
Helpful Tool ◽  
Starting Point ◽  
Decision Making Tool

Reverse logistics is a modern field of consideration, research and study, providing helpful information on the operation of the closed-loop supply chain. Although the starting point of this field is traced back to the early 90?s, no standard method has been suggested, neither prevailed. The purpose of this paper is to introduce a new approach on the study of reverse logistics. It is actually a review on how System Dynamics (SD) can be a helpful tool when it is used in the reverse logistics field. The paper explains the basic theory of the system modeling and next it utilizes the reverse logistics model. Finally, an illustrative example shows how SD modeling can be used to produce a powerful long-term decision-making tool.

scholarly journals Context Analysis in the Development of Diving Technologies

2019 ◽  
Vol 67 (2) ◽  
pp. 7-58
Author(s):  
Ryszard Kłos
Keyword(s):  
Decision Making ◽  
Continuous Improvement ◽  
Previous Article ◽  
Decision Making Process ◽  
Context Analysis ◽  
New Approach ◽  
Knowledge Based ◽  
Research Cycle ◽  
Level Of Risk

Abstract The previous article described a new approach methodology1 for work on the development of technology for the use of the SCR CRABE SCUBA2 type diving apparatus. However, after its publication numerous questions emerged regarding the genesis of the research undertaken, also from foreign partners using the same rebreather. The work on changing the technology of use was preceded by analyses, which were available only to people involved in the decision-making process. Demonstrating all the details of the decision-making process may be tedious, but failing to present them at all might raise justified doubts about the advisability of conducting a long-term research cycle. This article only presents preliminary analyses. The necessity to perform them resulted from the specific requirements for military technologies3 which, as broadly as possible, should be knowledge-based. The knowledge-based approach by its very nature allows continuous improvement of the adequacy of the predictions made, the estimation of the level of risk when diagnosing deviations from the repeatability or precision of the model, and the possibility of adapting the technology to the changing requirements of the user resulting from tactical considerations of its use.

Dealing with Multiple Models in System Dynamics

2014 ◽  
Vol 3 (4) ◽  
pp. 17-35 ◽  
Author(s):  
Willem L. Auping ◽  
Erik Pruyt ◽  
Jan H. Kwakkel
Keyword(s):  
System Dynamics ◽  
Simulation Models ◽  
Dynamics Simulation ◽  
Multiple Models ◽  
Top Down ◽  
Bottom Up ◽  
New Approach ◽  
Behavioural Patterns ◽  
Copper Availability

This paper introduces an approach to compare simulation runs from multiple System Dynamics simulation models. Three dynamic hypotheses regarding the uncertain evolutions of long-term copper availability are introduced and used to illustrate the new approach. They correspond to three different perspectives on the copper system (global top-down, global bottom-up, and regional top-down). Although each of these models allows to generate a wealth of behavioural patterns, the focus in this paper is on the differences in trajectories caused by different models for identical values of shared parameters and identical settings of other assumptions, not on differences in behavioural patterns caused by each of the models. Hence, differences in trajectories between the three models are identified, quantified, and classified based on a quantified measure of difference. For these models, small differences between the trajectories are only found in stable runs, while the alternative perspectives are largely responsible for medium to large differences. Hence, it is concluded that multiple dynamic hypotheses may have to be modelled when dealing with uncertain issues.

scholarly journals An evaluation of defluoridation technologies in the context of decision-making strategies

2021 ◽  
Author(s):  
Ann C Fantin
Keyword(s):  
Decision Making ◽  
Drinking Water ◽  
Careful Consideration ◽  
Government Officials ◽  
Local Conditions ◽  
Starting Point ◽  
Specific Community ◽  
The Government ◽  
Selection Of

Fluoride can be considered beneficial or harmful to human health dependant on the amount that is ingested. Many methods exist for the removal of excessive fluoride from drinking water; however, not all defluoridation methods are appropriate for the specific local conditions that may be present within a community. The objective of this research project is to evaluate various available defluoridation technologies against characteristics of a successful and sustainable technology, while considering decision-making strategies that may be employed by those selecting an appropriate defluoridation method to suit the characteristics of the specific community that is affected by fluoride-impacted drinking water. An evaluation of the selected defluoridation technologies supports the notion that there is not an all-encompassing defluoridation technology that would be applicable to all types of situations in which fluoride impacted groundwater is a concern. Water treatment methods for developing countries require careful consideration and selection of a sustainable solution so as to provide long-term benefits and applicability. Formal decision-making strategies would be useful tools at the government level to provide a starting point to determine which available defluoridation methods would be viable at the end user level. Researchers, government officials and, most importantly, local inhabitants of suffering areas must work together to achieve the common goal of clean and safe potable water.

scholarly journals The Dynamics of Brand-Driven Quality Improvement Decision-Making in Multi-Small-Supplier Agri-Food Supply Chain: The Case of China

2021 ◽  
Vol 13 (19) ◽  
pp. 10815
Author(s):  
Jing Mu ◽  
Jing Li ◽  
Yaze Li ◽  
Chao Liu
Keyword(s):  
Decision Making ◽  
Supply Chain ◽  
System Dynamics ◽  
Food Quality ◽  
Closed Loop ◽  
Brand Value ◽  
System Behavior ◽  
Decentralized Decision Making ◽  
Core Brand

This paper develops a system dynamics framework for the closed-loop agri-food brand supply chain (AFBSC) with multiple small farmer suppliers and one core brand manufacturer, and investigates the influences of various factors including brand effort, quality elasticity, price elasticity, revenue sharing, and the number of suppliers on the system behavior. The results show: (i) food quality is determined by all farmer suppliers, who might choose hitchhiking with the prisoner’s dilemma game in a decentralized decision-making mode; (ii) brand effort to improve brand value for food quality is mainly made by the core brand manufacturer, who presents a goal-seeking system dynamics (SD) manner with oscillation behavior around the expected quality of consumers; (iii) whether farmer suppliers or brand manufacturers, the centralized decision-making mode is more useful for them to increase revenue than the decentralized one; furthermore, the shared centralized decision-making mode is most useful for them to obtain more revenue, and the brand manufacturer is still the biggest beneficiary.

scholarly journals An evaluation of defluoridation technologies in the context of decision-making strategies

2021 ◽  
Author(s):  
Ann C Fantin
Keyword(s):  
Decision Making ◽  
Drinking Water ◽  
Careful Consideration ◽  
Government Officials ◽  
Local Conditions ◽  
Starting Point ◽  
Specific Community ◽  
The Government ◽  
Selection Of

Fluoride can be considered beneficial or harmful to human health dependant on the amount that is ingested. Many methods exist for the removal of excessive fluoride from drinking water; however, not all defluoridation methods are appropriate for the specific local conditions that may be present within a community. The objective of this research project is to evaluate various available defluoridation technologies against characteristics of a successful and sustainable technology, while considering decision-making strategies that may be employed by those selecting an appropriate defluoridation method to suit the characteristics of the specific community that is affected by fluoride-impacted drinking water. An evaluation of the selected defluoridation technologies supports the notion that there is not an all-encompassing defluoridation technology that would be applicable to all types of situations in which fluoride impacted groundwater is a concern. Water treatment methods for developing countries require careful consideration and selection of a sustainable solution so as to provide long-term benefits and applicability. Formal decision-making strategies would be useful tools at the government level to provide a starting point to determine which available defluoridation methods would be viable at the end user level. Researchers, government officials and, most importantly, local inhabitants of suffering areas must work together to achieve the common goal of clean and safe potable water.

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