scholarly journals Two-Stage Humanitarian Logistics Deprivation Model for the Planning of Scarce KN-95 Facemask Supplies under Agent’s Cooperation

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Oscar L. Pineda-Martinez ◽  
Carlos D. Paternina-Arboleda ◽  
Guisselle A. García-Llinás
Keyword(s):  
Cooperative Games ◽  
Programming Model ◽  
Wide Spectrum ◽  
Humanitarian Logistics ◽  
Human Suffering ◽  
Stage Model ◽  
Mathematical Programming Model ◽  
Two Stage ◽  
Deprivation Model ◽  
The Cost

Humanitarian logistics encompasses a wide spectrum of conditions or constraints for supply chains, yet its focus on mitigating human suffering efficiently is what has motivated organizations and governments to make rapid decisions in real time. In this article, through the approach to an emergency such as COVID-19, we propose a two-stage model capable of considering human suffering, the cost of humanitarian logistics, and the benefit obtained by the interaction of suppliers that generally behave as oligopolies through a mathematical programming model and one of the cooperative games. Our main finding was the adaptability of a previously validated model for humanitarian logistics to the ongoing COVID-19 pandemic, where the externalities had greater relevance in social costs than private costs.

War or Peace

2003 ◽  
Vol 2 (1) ◽  
Author(s):  
Hongbin Cai
Keyword(s):  
Stage Model ◽  
Two Stage ◽  
Domestic Production ◽  
Peace Negotiations ◽  
Medium Range ◽  
Monitoring And Enforcement ◽  
The Cost ◽  
Investment Choices

Abstract This paper studies a simple two-stage model of conflict in which two players allocate resources between arms and domestic production in the first stage and subsequently engage in peace negotiations trying to avoid war. War is costly and war damages depend on arms buildup. Peace also comes with costs (e.g., disarmament, monitoring and enforcement). We show that when the cost of peace is in the medium range and resources are more effective in causing damages to one's enemy when invested in arms than in being productive in domestic production, the game has two kinds of equilibria: those involving peace and those involving war. The two players will build more arms in any peace equilibrium than in the (unique) war equilibrium. When the cost of peace is unknown to the players while making investment choices, arms levels in equilibrium are positively correlated with the probability of peace.

scholarly journals Slotting Optimization Model for a Warehouse with Divisible First-Level Accommodation Locations

2021 ◽  
Vol 11 (3) ◽  
pp. 936
Author(s):  
Pablo Viveros ◽  
Katalina González ◽  
Rodrigo Mena ◽  
Fredy Kristjanpoller ◽  
Javier Robledo
Keyword(s):  
Mathematical Programming ◽  
Optimization Model ◽  
Assignment Problem ◽  
Storage Capacity ◽  
Programming Model ◽  
Complex Problem ◽  
Entry And Exit ◽  
Mathematical Programming Model ◽  
Multi Level ◽  
The Cost

Efficiency in supply chains is critically affected by the performance of operations within warehouses. For this reason, the activities related to the disposition and management of inventories are crucial. This work addresses the multi-level storage locations assignment problem for SKU pallets, considering divisible locations in the first level to improve the picking operation and reduce the travel times associated with the routes of the cranes. A mathematical programming model is developed considering the objective of minimizing the total travel distance, and in the background, maximizing the use of storage capacity. To solve this complex problem, we consider its decomposition into four subproblems, which are solved sequentially. To evaluate the performance of the model, two analysis scenarios based on different storage strategies are proposed to evaluate both the entry and exit distance of pallets, as well as the cost associated with the movements.

scholarly journals Conditions influencing the choice between direct shipment and transshipment in maritime shipping network

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Hoshi Tagawa ◽  
Tomoya Kawasaki ◽  
Shinya Hanaoka
Keyword(s):  
Cost Effectiveness ◽  
Cost Effective ◽  
Geographical Distance ◽  
Stage Model ◽  
Two Stage ◽  
Vessel Size ◽  
Maritime Shipping ◽  
Two Factors ◽  
The Cost

AbstractThis study examines the conditions that influence the choice between direct shipment and transshipment, focusing on two factors: geographical distance and demand. We develop a two-stage model comprising shipping lines and shippers, and apply it to a virtual maritime network with one origin, two destination ports, and one hub port. The generalized costs of shippers in the optimum direct shipment and in transshipment for the shipping lines model are compared to evaluate the choice between direct shipment and transshipment. We find that competitiveness of the port as a hub, indicating the cargo volume aggregated in transshipment, is essential for examining the cost-effectiveness of direct shipment and transshipment. The comparison between the cost-effectiveness of direct shipment and transshipment is based on the configuration of each network, especially in terms of frequency and the vessel size deployed. Direct shipment can be more cost-effective for short distances.

scholarly journals The Dual of a Cost Minimizing Linear Transshipment Model: An Economic Interpretation of an Assembly-Plant Processing-Distribution Network for a Firm

1974 ◽  
Vol 6 (1) ◽  
pp. 139-142 ◽  
Author(s):  
William. M. Holroyd
Keyword(s):  
Mathematical Programming ◽  
Programming Model ◽  
Mathematical Structure ◽  
Mathematical Programming Model ◽  
Transportation Model ◽  
Economic Interpretation ◽  
Plant Processing ◽  
The Cost ◽  
Linear Cost ◽  
Number Of Authors

The general economic meanings and mathematical structure of the dual of a primal mathematical programming model have been discussed for many years. However, within the mathematical programming realm, many interesting formulization variations have developed partly in response to variations in particulars of problems.A number of authors have discussed the economic meaning and mathematical structure of the primal of a linear cost minimizing transportation model. Some authors discussed the economic meaning and mathematical structure of the dual as well as the primal of the transportation model. Several authors discussed cost minimizing transshipment models. Recently, greater interest has been shown in specific economic meanings of the dual of the cost minimizing transshipment model.

Timing of repeated movements: Test of a two-stage model

1997 ◽  
Author(s):  
Saul Sternberg ◽  
Teresa Pantzer
Keyword(s):  
Stage Model ◽  
Two Stage

Nonlinear dynamics of pulsating detonation wave with two-stage chemical kinetics in the shock-attached frame

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Yaroslava E. Poroshyna ◽  
Aleksander I. Lopato ◽  
Pavel S. Utkin
Keyword(s):  
Wave Propagation ◽  
Detonation Wave ◽  
Model Comparison ◽  
Approximation Order ◽  
Transition Regime ◽  
Stage Model ◽  
Two Stage ◽  
One Dimensional ◽  
Kinetics Of ◽  
Detonation Wave Propagation

Abstract The paper contributes to the clarification of the mechanism of one-dimensional pulsating detonation wave propagation for the transition regime with two-scale pulsations. For this purpose, a novel numerical algorithm has been developed for the numerical investigation of the gaseous pulsating detonation wave using the two-stage model of kinetics of chemical reactions in the shock-attached frame. The influence of grid resolution, approximation order and the type of rear boundary conditions on the solution has been studied for four main regimes of detonation wave propagation for this model. Comparison of dynamics of pulsations with results of other authors has been carried out.

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