Industrial Management
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Item A Review on City Logistics and Two Echelon Freight Modelling(International Conference on Industrial Engineering and Operations Management, 2020) Warnakulasuriya, M.M.; Niwunhella, D.H.H.; Nanayakkara, L.D.J.F.; Wickramarachchi, RuwanWhen cities are growing in both size and complexity, the freight distribution and management make a significant challenge for transportation management. Freight transportation execution is one of the main sectors that is looked into when planning. The concept of city logistics explicitly tries to optimize the urban transport network and many optimization approaches have been introduced to optimize the vehicle routing methods considering several objectives. Since recent times, there is drawing attention for two-echelon freight consolidation modelling efforts with the emerging of megacities. This paper reviews the available literature under the city logistics modelling, and two-echelon freight consolidation for identifying the perspectives adhered. The study was conducted through a systematic review of literature using multiple studies published under the area of city logistic modeling and two-echelon-distribution modelling in thorough key word base search of city logistic modelling efforts, and performance parameters used for freight analysis within city networks from the findings. The review framework takes into account the diversity and complexity found in city logistics practices. It was evident that there is a lack of modelling efforts in two-echelon vehicle routing for city logistic combining with optimization models for dealing with multiple objective and modeling uncertainty.Item Vehicle Routing and Shipment Consolidation in a 3PL DC: A Systematic Literature Review of the Solution Approaches(IEOM Society International, 2021) Weerakkody, H.D.W.; Wijayanayake, A.; Niwunhella, D.H.H.Many of the manufacturing companies tend to outsource their logistic activities to third party logistics (3PL) providers due to numerous benefits they could obtain. Since 3PL providers provide their distribution services for multiple clients at the same time, managing these activities properly with an optimized cost is challenging for them, So, they are much interested in minimizing the distribution cost which will ultimately benefit the 3PL provider, and thereby the client as well. Shipment consolidation is one of the best and effective cost reduction strategies which could be followed by the 3PL firms, when distributing goods of multiple clients. Vehicle Routing Problem (VRP) which is a well-discussed problem in the literature can be applied here since it is beneficial for the 3PL providers to find the optimal routes to distribute the goods from the central 3PL Distribution Center (DC), while consolidating shipments of multiple clients. Therefore, this literature survey has been carried out to analyze the solution approaches, used in the literature related to VRP and shipment consolidation such that it would help in future research in developing a model to optimize the distribution in a 3PL DC by consolidating shipments of multiple clients. The results of the study have shown that most of the referred papers have used metaheuristic algorithms in solving their models and when the number of nodes are larger, it is suitable to use metaheuristic algorithms. Therefore, it can be concluded that a metaheuristic algorithm would be appropriate when developing a model to optimize the distribution in a 3PL DC by consolidating shipments of multiple clients.Item Measuring Sustainability Performance of Logistics Service Providers using AHP(IEOM Society International, 2021) Prabodhika, A.P.K.J.; Wijayanayake, A.; Niwunhella, D.H.H.Many manufacturers and retailers often outsource their logistics functions to Logistics Service Providers (LSPs) to focus more on their core business process. Due to the competitiveness and the popularity of the sustainability concept, those organizations evaluate their prospective LSPs not only based on economic aspects like cost, service quality but also on social and environmental aspects as well. This paper proposes a model that can be used by organizations when evaluating and selecting LSPs based on their sustainability performance. Along with the traditional three dimensions of sustainability, a new dimension of Information Technology (IT) is incorporated into the model. A Composite Sustainability Performance Index (CSPI) is constructed using the Analytical Hierarchy Process (AHP) as a weighting method and linear aggregation method since multiple dimensions and indicators need to be incorporated when measuring sustainability performance. The proposed model is flexible as it depends on the sustainability requirements of the organization when selecting LSPs and their relative impoftance of the sustainability dimensions and indicators are up to the organization to decide. The proposed model is applied to an apparel manufacturing organization to evaluate and select their prospective LSPs.Item Effective Supplier Selection Using ANP(IEOM Society International, 2021) udakanjaree, H.I.; wijayanayake, A.N.; Niwunhella, D.H.H.A supplier provides monetary benefts as well as non-monetary benefits for the organization, especially to maintain company reputation and customer satisfaction. Therefore, an effective supplier netiork is an importani key success factor of the organization' There arT{n?ny c_ommon drawbacks in the existing supplier selection processes which hinder the selection ofeffective supplidr/suppliers. Therefore, the objective ofthis research is to develop a model and a mechanism to overcome these common drawbacks while predicting ttre validity of the model across a few industries. With the scope of this paper, supplier selection was considered as a multi-criteria decision making problem 1UCOUI because supplier selection is the evaluation of trade-offs between multiple criteria. Analytic Network process (AI.tp) which is a technique to solve MCDM problems in which the criteria aff:ect each other ani have nonlinear correiatiorl is used here to prioritize criteria and alternatives. Therefore, this model is flexible for selecting suppliers for any product/service across any organization, sector, and industry. The significance of the proposed mo-clel is'its Flexibility across any industry with limitations and supports multiple criteria wlth any number of aliernatives.Item Developing a Multi Criteria Decision Making Framework to Select the Most Suitable Production Line in Apparel Firms: Use of ANP Method(IEOM Society International, 2021) Thalagahage, N.T.H; Wijayanayake, A.W.; Niwunhella, D.H.H.The apparel industry is considered as one of the most labor-intensive industries where production planning and Control (PPC) is considered as an impoftant function, because of its involvement from scheduling each task i-n the process till the delivery of customer demand. Line planning is a sub process within PPC, through which the production orders are allocated to production lines according to its setting and due dates ofproduction completion. The decisions that address line planning function still heavily rely on the expertise of the ploduction planner. When production planners are required to select production lines for the production ofa particuiar type ofpioduct, little emphasis has been placed on ways to apportion ceftain production orders to the most appropriate pioduction system. In thii research, a framework is developed using Analyical Network Process (ANP) which is a Multi Critlria Decision Making (MCDM) method, enabling the incorporation of all the planning criteria in the selection of a production line. The weighted scores obtained by the best alternative production lines are used in a Linear Programming model to optimize the resource allocation in an apparel firm.