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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Journal of Optimization in Industrial Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Mixed-integer linear programming,Disaster,Medical emergency services,Location-routing,ε-constraint
- چکیده:
- چکیده انگلیسی: One of the main critical steps that should be taken during natural disasters is the assignment and distribution of resources among affected people. In such situations, this can save many lives. Determining the demands for critical items (i.e., the number of injured people) is very important. Accordingly, a number of casualties and injured people have to be known during a disaster. Obtaining an acceptable estimation of the number of casualties adds to the complexity of the problem. In this paper, a location-routing problem is discussed for urgent therapeutic services during disasters. The problem is formulated as a bi-objective Mixed-Integer Linear Programming (MILP) model. The objectives are to concurrently minimize the time of offering relief items to the affected people and minimize the total costs. The costs include those related to locations and transportation means (e.g., ambulances and helicopters) that are used to carry medical personnel and patients. To address the bi-objectiveness and verify the efficiency and applicability of the proposed model, the ε-constraint method is employed to solve several randomly-generated problems with CLEPX solver in GAMS. The obtained results include the objective functions, the number of the required facility, and the trade-offs between objectives. Then, the parameter of demands (i.e., number of casualties), which has the most important role, is examined using a sensitivity analysis and the managerial insights are discussed.
- انتشار مقاله: 01-11-1395
- نویسندگان: Hesam Adrang,Ali Bozorgi-Amiri,Kaveh Khalili-Damghani,Reza Tavakkoli-Moghaddam
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Industrial and Systems Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Recycling,Tire industry,Closed loop supply chain,reverse supply chain,third party logistics
- چکیده:
- چکیده انگلیسی: Organizations are nowadays seeking competitive advantage over other rivals, reduction of costs, and customer satisfaction for their progress and development. One of the key factors in reaching the competitive advantage is to have a robust logistic system. The available complexities in the forward and reverse integration processes lead managers to take the companies offering third party logistics services as proper alternatives for outsourcing processes. Furthermore, with population growth and development of transportation network, the amount of scrap products related to this industry is increasing. One of the widely used products is tire which could cause irreversible damages to the environment if it is not logically and appropriately disposed after being fully used. Accordingly, this study proposed a multi-period, multi-product, bi-objective mathematical model to design a closed-loop supply chain network in the tire industry concerning sustainability factors (economic and social) under the third party logistic management. The proposed model aimed at maximizing the profit made by different process over the scrap products and reaching social sustainability as well. Furthermore, the environmental impacts were controlled. The augmented epsilon-constraint method was implemented to solve the multi-objective model and reach optimal Pareto solutions. Finally, the proposed model was validated against a case study in the tire industry.
- انتشار مقاله: 22-11-1398
- نویسندگان: Beheshteh Moghadas Poor,Mohammad Saeed Jabalameli,Ali Bozorgi-Amiri
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Industrial and Systems Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Capacitated hubs,Hierarchical hub location,multiple vehicles and commodity
- چکیده:
- چکیده انگلیسی: In this study a hierarchical hub location problem with two layers is considered. The first layer includes small hubs and the second one includes a star-shaped network central hub. The considered case is a cargo delivery network where there is hierarchy between hubs. All the hubs and links are capacitated and there are three kinds of commodities for each of which there is a special kind of vehicle. The purpose is to determine the optimal cost by locating small hubs (city hubs) and the central hub, allocation of links to the hubs, and finding the optimal number of vehicles for each hub. The model is a mixed integer nonlinear programming. A case study for this model is performed in a cargo delivery network by using published data in Iranian Statistics Organization website, and it is solved by appropriate software.
- انتشار مقاله: 10-12-1396
- نویسندگان: Sara Sadat Torkestani,Firoozeh Kaveh,Ali Bozorgi-Amiri
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Industrial and Systems Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Citizenship equity,urban management and planning,public facilities location,reservation level Tchebycheff procedure (RLTP)
- چکیده:
- چکیده انگلیسی: In the present research, a multi-objective model is proposed, which considers equity among the citizens in addition to the cost criterion. Then, the model will be solved using Reservation Level Tchebycheff Procedure (RLTP), which is one of the interactive multi-objective decision-making techniques. Subsequently, the obtained results will be compared with those of the single-objective models to determine the effect of considering and not considering the equity criterion on public facilities location. Results of the present study show that the basic models of public facilities location do not consider the equity criterion; thus, in order to protect citizens’ rights, it is necessary for decision-makers of the urban management and planning to consider the objective of equity, along with other objectives of the project, as a multi-objective model in public facilities location problems. The proposed multi-objective model has also desirable and acceptable performance, which can be used in the public facilities location problems.
- انتشار مقاله: 07-08-1396
- نویسندگان: Ali Bozorgi-Amiri,Ariyan Hosseinzadeh
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Industrial and Systems Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Renewable Energies,electricity supply chain,operational planning,electricity storage
- چکیده:
- چکیده انگلیسی: Nowadays, utilization of renewable energies for satisfying electricity demand has received more interest, and renewable electricity generation has been growing in the world. This study addresses the operational planning of a renewable electricity supply chain over a multi-period planning horizon. The purpose of this study is to maximize total profit and to optimize the operational decisions related to power transmission and storage in a wind-based electricity supply chain. The applicability of the developed model is demonstrated by a case study. Due to the wind intermittency and demand variations, some probable scenarios are considered. Sensitivity analysis provides several managerial insights. Numerical results indicate that line capacity expansion can make a good promotion in each scenario by reducing unmet demand and making more profit. Moreover, incorporating an electricity storage system in wind farms improves demand covering in peak load hours.
- انتشار مقاله: 29-11-1395
- نویسندگان: Fatemeh Bayatloo,Ali Bozorgi-Amiri,Fatemeh Sabouhi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Industrial and Systems Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Multi-Objective Programming,Closed-loop supply chain,location model,paper recovery
- چکیده:
- چکیده انگلیسی: Governments and customers are forcing the paper manufacturers to become more sustainable. Accordingly, there still exists a gap in the quantitative modeling of these issues. In this paper, this gap is covered through simultaneously considering economical, environmental and social impacts in the paper closed-loop supply chain network design. The proposed multi-objective, multi-echelon, multi-product and single-period model is composed of suppliers, plants, regional wholesalers, retailers, customer zones, collection sites, centralized collection points, recycling facilities, energy recovery and disposal centers.The objectives considered are minimization of total cost; environmental benefit through maximizing coverage of collected waste paper by opened centralized collection centers; and maximization of the social impact of the network in a way that would prefer the location of facilities in the less populated regions.The proposed model is applied to an illustrative example designed utilizing real data of the paper industry in East Azerbaijan of Iran and interactive fuzzy goal programming approach is used to solve the developed model. Sensitivity analysis of the proposed model is also performed by considering key parameters.
- انتشار مقاله: 20-09-1395
- نویسندگان: Arezoo Rahmani-Ahranjani,Ali Bozorgi-Amiri,Mehdi Seifbarghy,Esmaeil Najafi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Industrial and Systems Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Disaster management,Scheduling,Routing,Multi-objective optimization
- چکیده:
- چکیده انگلیسی: Following the occurrence of unexpected events and natural disasters, a highly important relief operation is the transferring of relief commodities from the distribution centers (CDs) to shelters. In this paper, a three-level network consisting of depot of vehicles, distribution centers and shelters has been considered for routing and scheduling of relief vehicles through introducing a multi-objectivemodel. The first objective function represents the total arrival time of vehicles to CDs and shelters. The second objective function illustrates the number of vehicles used. We use the TH method to deal with the multi-objective problem. During the relief commodities distribution, issues such as the feasibility of getting servicefrom each distribution centerwith multiple vehicles, and heterogeneous fleet of vehicles has been regarded. In order to solve the proposed model and represent its efficiency, we select the fourth region of Tehran city as a case study, run the model on it, and present solution results.
- انتشار مقاله: 28-11-1394
- نویسندگان: Fatemeh Sabouhi,Mehdi Heydari,Ali Bozorgi-Amiri
- مشاهده
- جایگاه : پژوهشی
- مجله: International Journal of Hospital Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Statistical analysis,Emergency department, Resilience engineering, Patient trust, Z-Number data envelopment analysis (ZDEA)
- چکیده:
- چکیده انگلیسی: Background and Objectives: Emergency departments often encounter several risk and health issues which significantly impact on overall healthcare performance. Resilience engineering (RE) enables emergency departments to confront sudden changes and handling health risk issues. Patient trust (PT) is also one of the most effective factors which improve quality of care along with patient satisfaction.
Methods: This study integrates resilience engineering and trust to enhance the overall performance of emergency departments (EDs). A unique algorithm is introduced to demonstrate the superiority of the proposed integrated approach. It is composed of Z-number data envelopment analysis (DEA), fuzzy DEA, and statistical analysis. The required data are collected using standard questionnaires from a real-life emergency department. The obtained results are verified and validated by FDEA.
Findings: The results indicate that considering RE and trust increases ED efficiency significantly. Also, flexibility, fault-tolerance, reporting culture, and specialty level are the most effective factors. Moreover, trust and resiliency have similar statistical impacts on overall system efficiency.
Conclusions: One of the concerns of medical service providers nowadays is to build an efficient ED capable of providing services to a large number of patients. Therefore, to evaluate the performance of the ED, both concepts of PT and RE which are applicable to enhance the preventive safety and promote the performance, are simultaneously considered for the first time in this study.- انتشار مقاله: 31-01-1396
- نویسندگان: Maryam Tohidifard,Reza Yazdanparast,Ali Bozorgi-Amiri,Ali Azadeh
- مشاهده
- جایگاه : پژوهشی
- مجله: Advances in Industrial Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Disaster management,Scheduling,Location of shelters,Routing
- چکیده:
- چکیده انگلیسی: After natural disasters and unexpected events, one of the most vital actions of disaster response phase is to transport evacuees from disaster areas to safe places. In this paper, decisions of the location of shelters and routing and scheduling of relief vehicles at the same time are modeled for a two-level network including depots of vehicles, affected areas, and shelters. In the evacuation operation, the possibility of servicing to evacuees in each affected area by several vehicles, existence of multiple depots of heterogeneous vehicles and time window constraints are considered. To solve the proposed model and demonstrate its efficiency, a numerical example was solved by exact method, and it was done the sensitivity analysis on the problem main parameters. Results show that the number of shelters to locate evacuees and capacity of relief vehicles effects on total times for vehicles to get to affected areas and shelters.
- انتشار مقاله: 25-05-1394
- نویسندگان: Fateme Sabouhi,Ali Bozorgi-Amiri,Mahdi Heydari
- مشاهده
- جایگاه : پژوهشی
- مجله: Advances in Industrial Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Disaster management,Scheduling,Location of shelters,Routing
- چکیده:
- چکیده انگلیسی: After natural disasters and unexpected events, one of the most vital actions of disaster response phase is to transport evacuees from disaster areas to safe places. In this paper, decisions of the location of shelters and routing and scheduling of relief vehicles at the same time are modeled for a two-level network including depots of vehicles, affected areas, and shelters. In the evacuation operation, the possibility of servicing to evacuees in each affected area by several vehicles, existence of multiple depots of heterogeneous vehicles and time window constraints are considered. To solve the proposed model and demonstrate its efficiency, a numerical example was solved by exact method, and it was done the sensitivity analysis on the problem main parameters. Results show that the number of shelters to locate evacuees and capacity of relief vehicles effects on total times for vehicles to get to affected areas and shelters.
- انتشار مقاله: 25-05-1394
- نویسندگان: Fateme Sabouhi,Ali Bozorgi-Amiri,Mahdi Heydari
- مشاهده