Saeed Mousakhani; Saeed Mousakhani; Mohamad Sadegh Sangari
Abstract
Integrated production-distribution planning is one of the main issues in supply chain management that plays an important role in reducing supply chain costs. In addition, choosing optimal location of distribution centers can facilitate achieving this goal. On the other hand, environmental laws and regulations ...
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Integrated production-distribution planning is one of the main issues in supply chain management that plays an important role in reducing supply chain costs. In addition, choosing optimal location of distribution centers can facilitate achieving this goal. On the other hand, environmental laws and regulations established by governments impose constraints to production and distribution activities and make necessary the adoption of green supply chain approach more than ever. In this paper, a novel model is developed for integrated location-production-distribution planning in a three-echelon green supply chain consisting of manufacturing plants, distribution centers, and customers with multiple products and multiple time periods. The objective function includes minimization of the total supply chain costs as wll as CO2 emissions throughout the chain. Also, the customer demand and service level are expressed as fuzzy Z-number in order to obtain the reliability of the values from the experts. The applicability and efficiency of the proposed model is demonstrated through a real case which, considering two indexes of customer service level and green production and distribution. In order to solve the proposed model, GAMS software package is used. Results show satisfactory performance of the proposed model in reducing costs in the green supply chain.
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Abstract
Mobile phone towers strength and coverage after happening natural disaster are one of the most important issues in set covering. Every day advances and developments of mobile phone technology have made the telecommunication industry and transferring equipment more important and subscribers and users ...
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Mobile phone towers strength and coverage after happening natural disaster are one of the most important issues in set covering. Every day advances and developments of mobile phone technology have made the telecommunication industry and transferring equipment more important and subscribers and users of the mobile phones and increasing which requires better planning. So, the subject of coverage ability of the cell phone towers is very important. Natural disasters for example earthquake, flood, storm, landslides and activating volcano affect roads, bridges, communication systems, electrical supplying and availability to facilities. Extensive human casualties and huge economic damages are showing prediction necessity and programming for facing these events preventing crisis occurring This paper develops location and strengthening of cell phone towers to maximize service coverage and minimize the loss of communication if natural disaster happens. In addition, proposed model considers backup and emergency coverage. We present a case study of our approach for disaster planning for disaster scenario in a region of Iran. Numerical experiments demonstrate the significance and applicability of the developed model for actual decision-making problem.