An integrated production, inventory, warehouse location and distribution model
Author: Lokendra Kumar Devangan
Journal of Operations and Supply Chain Management
Vol 9, No 2 (2016)
FGV's Brazilian School of Public and Business Administration (EBAPE)
Abstract:
This paper proposes an integrated production and distribution planning optimization model for multiple manufacturing locations, producing multiple products with deterministic demand at multiple locations. There are multiple modes of transport from plants to demand locations and warehouses. This study presents a model which allows decision makers to optimize plant production, transport and warehouse location simultaneously to fulfill the demands at customer locations within a multi-plant, multi-product, and multi-route supply chain system when the locations of the plants are already fixed. The proposed model is solved for sample problems and tested using real data from a cement manufacturing company in India. An analysis of the results suggests that this model can be used for various strategic and tactical production and planning decisions.
Design and Optimization of Supply Chain Network with Nonlinear Log-Space Mode...RSIS International
This proposal intends to address the practical vulnerabilities in the state-of-the-art models for optimal design of supply chain network. While the conventional models attempt to transform the design constraints of the supply chain network into sum of cost functions, the proposed model will transform the cost function into a nonlinear subspace. Moreover, the subspace will be optimized under a logarithmic scale and so the multiple network constraints such as stock transportation, inventory, echelon levels and backorders can be mapped within the subspace. Subsequently, robust optimization algorithms based on biological inspiration will be proposed. The optimization algorithms will be included with adaptiveness and so the nonlinear cost function can be solved effectively. The adaptiveness will be mainly based on the ability of handing every network constraints such as echelon levels, inventory, etc
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Plant location selection by using MCDM methodsIJERA Editor
Plant location selection has a critical impact on the performance of manufacturing companies. The cost associated with acquiring the land and facility construction makes the location selection a long-term investment decision. The preeminent location is that which results in higher economic benefits through increased productivity and good distribution network. Both potential qualitative and quantitative criteria’s are to be considered for selecting the proper plant location from a given set of alternatives. Consequently, from the literature survey, it is found that the Multi criteria decision-making (MCDM) is found to be an effective approach to solve the location selection problems. In the present research, an integrated decision-making methodology is designed which employs the two well-known decision making techniques, namely Analytical hierarchy process (AHP), and Preference ranking organization method for enrichment evaluations (PROMETHEE-II) in order to make the best use of information available, either implicitly or explicitly. It is analyze the structure for the solution of plant location problems and to obtain weights of the selected criteria’s. PROMETHEE-II is employed to solve decision-making problems with multiple conflicting criteria and alternatives.
Implementation and Validation of Supplier Selection Model for Shaper Machine ...IJSRD
Supplier selection is the process through which firms identify, evaluate, and contract with suppliers. The supplier selection process deploys a tremendous amount of a firm’s financial resources. In return, manufacturing industries expect important benefits from contracting with suppliers offering high value. Like many complex supply chain problems, vendor selection problems are not so well defined which can be handed over completely to computers, whereas many human characteristics are also essential to the issues. In this paper attention is given to the fuzzy System helps Vendor Selection Problem (VSP) for Radial Drilling Bed (RDB). It required expert’s view, conversion it into fuzzy term, making 8 rule base Model with implementing Fuzzy System using MATLAB. At ending point, conclusions and likely areas of Fuzzy in selecting vendors are present.
Design and Optimization of Supply Chain Network with Nonlinear Log-Space Mode...RSIS International
This proposal intends to address the practical vulnerabilities in the state-of-the-art models for optimal design of supply chain network. While the conventional models attempt to transform the design constraints of the supply chain network into sum of cost functions, the proposed model will transform the cost function into a nonlinear subspace. Moreover, the subspace will be optimized under a logarithmic scale and so the multiple network constraints such as stock transportation, inventory, echelon levels and backorders can be mapped within the subspace. Subsequently, robust optimization algorithms based on biological inspiration will be proposed. The optimization algorithms will be included with adaptiveness and so the nonlinear cost function can be solved effectively. The adaptiveness will be mainly based on the ability of handing every network constraints such as echelon levels, inventory, etc
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Plant location selection by using MCDM methodsIJERA Editor
Plant location selection has a critical impact on the performance of manufacturing companies. The cost associated with acquiring the land and facility construction makes the location selection a long-term investment decision. The preeminent location is that which results in higher economic benefits through increased productivity and good distribution network. Both potential qualitative and quantitative criteria’s are to be considered for selecting the proper plant location from a given set of alternatives. Consequently, from the literature survey, it is found that the Multi criteria decision-making (MCDM) is found to be an effective approach to solve the location selection problems. In the present research, an integrated decision-making methodology is designed which employs the two well-known decision making techniques, namely Analytical hierarchy process (AHP), and Preference ranking organization method for enrichment evaluations (PROMETHEE-II) in order to make the best use of information available, either implicitly or explicitly. It is analyze the structure for the solution of plant location problems and to obtain weights of the selected criteria’s. PROMETHEE-II is employed to solve decision-making problems with multiple conflicting criteria and alternatives.
Implementation and Validation of Supplier Selection Model for Shaper Machine ...IJSRD
Supplier selection is the process through which firms identify, evaluate, and contract with suppliers. The supplier selection process deploys a tremendous amount of a firm’s financial resources. In return, manufacturing industries expect important benefits from contracting with suppliers offering high value. Like many complex supply chain problems, vendor selection problems are not so well defined which can be handed over completely to computers, whereas many human characteristics are also essential to the issues. In this paper attention is given to the fuzzy System helps Vendor Selection Problem (VSP) for Radial Drilling Bed (RDB). It required expert’s view, conversion it into fuzzy term, making 8 rule base Model with implementing Fuzzy System using MATLAB. At ending point, conclusions and likely areas of Fuzzy in selecting vendors are present.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Modelling of Vendor Selection Problem for Conventional Lathe Machine Bed by F...IJSRD
Like many complex supply chain problems, vendor selection problems are not so well defined which can be handed over completely to computers, whereas many human characteristics are also essential to the issues. In this paper attention is given to the fuzzy System helps Vendor Selection Problem (VSP) for Conventional Lathe Machine Bed . It required expert’s view, conversion it into fuzzy term, making 8 rule base Model with implementing Fuzzy System using MATLAB. At ending point, conclusions and likely areas of Fuzzy in selecting vendors are present.
Implementation and Validation of Supplier Selection Model for Planner Machine...IJSRD
Supplier selection is the process through which firms identify, evaluate, and contract with suppliers. The supplier selection process deploys a tremendous amount of a firm’s financial resources. In return, manufacturing industries expect important benefits from contracting with suppliers offering high value. Like many complex supply chain problems, vendor selection problems are not so well defined which can be handed over completely to computers, whereas many human characteristics are also essential to the issues. In this paper attention is given to the fuzzy System helps Vendor Selection Problem (VSP) for Radial Drilling Bed (RDB). It required expert’s view, conversion it into fuzzy term, making 8 rule base Model with implementing Fuzzy System using MATLAB. At ending point, conclusions and likely areas of Fuzzy in selecting vendors are present.
Formulation of a Combined Transportation and Inventory Optimization Model wit...IJERA Editor
Most distribution network design models existing in the literature have focused on minimizing the costs of
inventory and transportation. During the analysis of supply chain of currency management problem it is
observed that the transportation of currency from various sources to various destinations and the required
inventory to be maintained to meet the emerging demands requires formulation of a combined problem. This
framework aims to support the coordination of inventory and transportation activities to properly manage the
inventory profiles and currency flows between source locations and distribution centers. This paper considers a
multi-period inventory and transportation model for a single commodity. The key contribution of this paper is, a
mathematical programming formulation of transportation cum inventory problem is proposed and an algorithm
for this new formulation as a multi period decision process is intended. A numerical example of currency
transportation cum inventory is presented to illustrate the proposed algorithm.
A MULTI-OBJECTIVE APPROACH FOR OPTIMUM QUOTA ALLOCATION TO SUPPLIERS IN SUPPL...IAEME Publication
In all industrial firms where a large number of parts and components are supplied by different suppliers to the raw materiel stores. So it is necessary to keep a track of their performances and supplier ratings individually. The shortages of many basic raw materials and unfriendly attitudes on the part of suppliers can seriously jeopardize production units. So supplier evaluation comes a necessary task. The supplier selection in the supply chain is a multi-criteria problem for this a problem is formulated. The formulated problem is including three primary objectives such as minimizing the net purchase cost, minimizing the net transportation cost and minimizing the net late deliveries subject to realistic constraints regarding buyer’s demand, vendor’s capacity, budget allocation to individual vendor, Vendor’s quality of the items, vendor’s quota flexibility, purchase value of items etc. This paper consists of allocating the quota to suppliers from a set of pre-selected candidates. In this paper the Lexicographic Method is used and solved above three objectives on the priority basis. A real life example is also presented and solved by the MATLAB and results are shown in the paper.
Utility Function-based Pricing Strategies in Maximizing the Information Servi...IJECEIAES
Previous research only focus on maximizing revenue for pricing strategies for information good with regardless the marginal and monitoring costs. This paper aims to focus on the addition of marginal and monitoring costs into the pricing strategies to maintain the maximal revenue while introduce the costs incurred in adopting the strategies. The well-known utility functions applied to also consider the consumer’s satisfaction towards the service offered. The results show that the addition costs incurred for setting up the strategies can also increase the profit for the providers rather than neglecting the costs. It is also showed that the Cobb-Douglas utility functions used can enhance the notion of provider to optimize the revenue compared to quasi linear and perfect substitutes.
Optimal distributed generation in green building assessment towards line loss...journalBEEI
This paper presents an optimization approach for criteria setting of Renewable Distributed Generation (DG) in the Green Building Rating System (GBRS). In this study, the total line loss reduction is analyzed and set as the main objective function in the optimization process which then a reassessment of existing criteria setting for renewable energy (RE) is proposed towards lower loss outcome. Solar photovoltaic (PV)-type DG unit (PV-DG) is identified as the type of DG used in this paper. The proposed PV-DG optimization will improve the sustainable energy performance of the green building by total line losses reduction within accepted lower losses region using Artificial bee colony (ABC) algorithm. The distribution network uses bus and line data setup from selected one of each three levels of Malaysian public hospital. MATLAB simulation result shows that the PV-DG expanding capacity towards optimal scale and location provides a better outcome in minimizing total line losses within an appropriate voltage profile as compared to the current setting of PV-DG imposed in selected GBRS. Thus, reassessment of RE parameter setting and the proposed five rankings with new PV-DG setting for public hospital provides technical justification and give the best option to the green building developer for more
effective RE integration.
International Journal of Engineering Research and DevelopmentIJERD Editor
Electrical, Electronics and Computer Engineering,
Information Engineering and Technology,
Mechanical, Industrial and Manufacturing Engineering,
Automation and Mechatronics Engineering,
Material and Chemical Engineering,
Civil and Architecture Engineering,
Biotechnology and Bio Engineering,
Environmental Engineering,
Petroleum and Mining Engineering,
Marine and Agriculture engineering,
Aerospace Engineering.
Optimizing Waste Collection In An Organized Industrial Region: A Case Studyertekg
Download Link > https://ertekprojects.com/gurdal-ertek-publications/blog/optimizing-waste-collection-in-an-organized-industrial-region-a-case-study/
In this paper we present a case study which involves the design of a supply chain network for industrial waste collection. The problem is to transport metal waste from 17 factories to containers and from containers to a disposal center (DC) at an organized region of automobile parts suppliers. We applied the classic mixed-integer programming (MIP) model for the two-stage supply chain to the solution of this problem. The visualization of the optimal solution provided us with several interesting insights that would not be easily discovered otherwise.
The selection of third party logistics (TPL) providers is an important issue for enterprises to
outsource their logistics business. In this paper we propose a comprehensive evaluation model for TPL
suppliers based on AHP method. Furthermore, we Base on the evaluation index system including logistics cost,
the logistics operation efficiency and the basic qualities of service. The efficiency and application of the
proposed approach has been illustrated with a case study in Emergency Department of Sfax hospital
For the typical warehouse operation picking processes account for nearly 40-50% of total warehousing and distribution costs. Due to the significant financial impact picking is a critical area of focus for many supply chain operators. The supply chain industry is large and complex, as is each individual 3PL, warehouse, distribution center, manufacturer or retail that operates within it. For this reason there is no single picking method that will fit each individual supply chain. Any picking strategy or combination of picking strategies may be used. Some of the most commonly utilized picking strategies include batch, wave, cluster, piece, zone and sortation picking. The most basic picking strategy, piece picking, is the process of pulling inventory for a single order. The ratio for this method is one picker to one order. Batch picking is more complex. Using this method a picker will pull inventory from multiple orders into one large container or tote. Once all orders have been picked the inventory will be taken to a staging area where orders will be separated into their corresponding containers. Cluster picking is similar to batch picking in that multiple orders are picked simultaneously, but are picked directly into their corresponding containers rather than a group tote. This eliminates the added labor required to separate orders in the staging area. Wave picking is a method facilitated by warehouse management technology. Groups of orders are released in “waves” on a schedule to ensure labor is evenly distributed throughout the work day. Both wave length and frequency is determined by staff availability and daily workload. Zone picking is an inventory picking method where staff are designated to zones in the warehouse and only pick from those areas. Zones can be designated by groupings of SKUs or by aisle. Using this method multiple orders will be picked from each zone simultaneously. This method allows for inventory handling specialization by employee where necessary. Sortation picking is reserved for supply chain operations with the existing automated storage and retrieval system architecture. In this method inventory is brought to pickers via a conveyor system where they put items into their corresponding containers. This significantly reduces the labor hours required to complete order fulfillment activities. The final picking strategy is picking to box. In this method pickers remain at their designated station and place items into boxes as they move past on a conveyor system. Each box may visit multiple picking stations before order fulfillment is complete. To learn more about which picking strategy may be best for your business contact Datex for a no obligation operational assessment.
Warehouse Operations and Inventory Management Thomas Tanel
Companies that make the best use of the basic principles of planning and managing warehouse operations and inventory management have a competitive advantage. Organizations that lack warehouse strategic planning and inventory operational excellence lose profits, market share, cost advantages, and market leadership.
Traditional Supply Chain and Logistics channels are indeed changing. As organizations move from mass production and mass distribution to mass customization, creative approaches are needed in the management of warehousing and inventory. The challenge is always present, because different customers may demand different levels of service. Demand often cannot be forecasted, especially if one must deliver customized products or services exactly where the customer needs them.
Businesses today must understand that they are competing on the basis of time more than on any other factor. The rigors of supply chain management require that you take action to meet your customers’ demand for faster, more frequent, and more reliable deliveries. Your suppliers need to meet increasingly precise inbound schedules. Tomorrow’s customers are more likely to be in another country or continent than they are likely to be from across town, in another state, or in another province.
With a proven inventory management system and an A-B-C Analysis, you can transform your inventory into a proactive force that lowers your inventory investment, reduces carrying costs, boosts confidence in physical supply and distribution service levels, and increases customer and user satisfaction. From a storage and distribution perspective, you, as overseer of the supply management process, should also know how the warehousing layout design criteria and the space and storage schemes affect your material flow, service levels, computerization, and technology options.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Modelling of Vendor Selection Problem for Conventional Lathe Machine Bed by F...IJSRD
Like many complex supply chain problems, vendor selection problems are not so well defined which can be handed over completely to computers, whereas many human characteristics are also essential to the issues. In this paper attention is given to the fuzzy System helps Vendor Selection Problem (VSP) for Conventional Lathe Machine Bed . It required expert’s view, conversion it into fuzzy term, making 8 rule base Model with implementing Fuzzy System using MATLAB. At ending point, conclusions and likely areas of Fuzzy in selecting vendors are present.
Implementation and Validation of Supplier Selection Model for Planner Machine...IJSRD
Supplier selection is the process through which firms identify, evaluate, and contract with suppliers. The supplier selection process deploys a tremendous amount of a firm’s financial resources. In return, manufacturing industries expect important benefits from contracting with suppliers offering high value. Like many complex supply chain problems, vendor selection problems are not so well defined which can be handed over completely to computers, whereas many human characteristics are also essential to the issues. In this paper attention is given to the fuzzy System helps Vendor Selection Problem (VSP) for Radial Drilling Bed (RDB). It required expert’s view, conversion it into fuzzy term, making 8 rule base Model with implementing Fuzzy System using MATLAB. At ending point, conclusions and likely areas of Fuzzy in selecting vendors are present.
Formulation of a Combined Transportation and Inventory Optimization Model wit...IJERA Editor
Most distribution network design models existing in the literature have focused on minimizing the costs of
inventory and transportation. During the analysis of supply chain of currency management problem it is
observed that the transportation of currency from various sources to various destinations and the required
inventory to be maintained to meet the emerging demands requires formulation of a combined problem. This
framework aims to support the coordination of inventory and transportation activities to properly manage the
inventory profiles and currency flows between source locations and distribution centers. This paper considers a
multi-period inventory and transportation model for a single commodity. The key contribution of this paper is, a
mathematical programming formulation of transportation cum inventory problem is proposed and an algorithm
for this new formulation as a multi period decision process is intended. A numerical example of currency
transportation cum inventory is presented to illustrate the proposed algorithm.
A MULTI-OBJECTIVE APPROACH FOR OPTIMUM QUOTA ALLOCATION TO SUPPLIERS IN SUPPL...IAEME Publication
In all industrial firms where a large number of parts and components are supplied by different suppliers to the raw materiel stores. So it is necessary to keep a track of their performances and supplier ratings individually. The shortages of many basic raw materials and unfriendly attitudes on the part of suppliers can seriously jeopardize production units. So supplier evaluation comes a necessary task. The supplier selection in the supply chain is a multi-criteria problem for this a problem is formulated. The formulated problem is including three primary objectives such as minimizing the net purchase cost, minimizing the net transportation cost and minimizing the net late deliveries subject to realistic constraints regarding buyer’s demand, vendor’s capacity, budget allocation to individual vendor, Vendor’s quality of the items, vendor’s quota flexibility, purchase value of items etc. This paper consists of allocating the quota to suppliers from a set of pre-selected candidates. In this paper the Lexicographic Method is used and solved above three objectives on the priority basis. A real life example is also presented and solved by the MATLAB and results are shown in the paper.
Utility Function-based Pricing Strategies in Maximizing the Information Servi...IJECEIAES
Previous research only focus on maximizing revenue for pricing strategies for information good with regardless the marginal and monitoring costs. This paper aims to focus on the addition of marginal and monitoring costs into the pricing strategies to maintain the maximal revenue while introduce the costs incurred in adopting the strategies. The well-known utility functions applied to also consider the consumer’s satisfaction towards the service offered. The results show that the addition costs incurred for setting up the strategies can also increase the profit for the providers rather than neglecting the costs. It is also showed that the Cobb-Douglas utility functions used can enhance the notion of provider to optimize the revenue compared to quasi linear and perfect substitutes.
Optimal distributed generation in green building assessment towards line loss...journalBEEI
This paper presents an optimization approach for criteria setting of Renewable Distributed Generation (DG) in the Green Building Rating System (GBRS). In this study, the total line loss reduction is analyzed and set as the main objective function in the optimization process which then a reassessment of existing criteria setting for renewable energy (RE) is proposed towards lower loss outcome. Solar photovoltaic (PV)-type DG unit (PV-DG) is identified as the type of DG used in this paper. The proposed PV-DG optimization will improve the sustainable energy performance of the green building by total line losses reduction within accepted lower losses region using Artificial bee colony (ABC) algorithm. The distribution network uses bus and line data setup from selected one of each three levels of Malaysian public hospital. MATLAB simulation result shows that the PV-DG expanding capacity towards optimal scale and location provides a better outcome in minimizing total line losses within an appropriate voltage profile as compared to the current setting of PV-DG imposed in selected GBRS. Thus, reassessment of RE parameter setting and the proposed five rankings with new PV-DG setting for public hospital provides technical justification and give the best option to the green building developer for more
effective RE integration.
International Journal of Engineering Research and DevelopmentIJERD Editor
Electrical, Electronics and Computer Engineering,
Information Engineering and Technology,
Mechanical, Industrial and Manufacturing Engineering,
Automation and Mechatronics Engineering,
Material and Chemical Engineering,
Civil and Architecture Engineering,
Biotechnology and Bio Engineering,
Environmental Engineering,
Petroleum and Mining Engineering,
Marine and Agriculture engineering,
Aerospace Engineering.
Optimizing Waste Collection In An Organized Industrial Region: A Case Studyertekg
Download Link > https://ertekprojects.com/gurdal-ertek-publications/blog/optimizing-waste-collection-in-an-organized-industrial-region-a-case-study/
In this paper we present a case study which involves the design of a supply chain network for industrial waste collection. The problem is to transport metal waste from 17 factories to containers and from containers to a disposal center (DC) at an organized region of automobile parts suppliers. We applied the classic mixed-integer programming (MIP) model for the two-stage supply chain to the solution of this problem. The visualization of the optimal solution provided us with several interesting insights that would not be easily discovered otherwise.
The selection of third party logistics (TPL) providers is an important issue for enterprises to
outsource their logistics business. In this paper we propose a comprehensive evaluation model for TPL
suppliers based on AHP method. Furthermore, we Base on the evaluation index system including logistics cost,
the logistics operation efficiency and the basic qualities of service. The efficiency and application of the
proposed approach has been illustrated with a case study in Emergency Department of Sfax hospital
For the typical warehouse operation picking processes account for nearly 40-50% of total warehousing and distribution costs. Due to the significant financial impact picking is a critical area of focus for many supply chain operators. The supply chain industry is large and complex, as is each individual 3PL, warehouse, distribution center, manufacturer or retail that operates within it. For this reason there is no single picking method that will fit each individual supply chain. Any picking strategy or combination of picking strategies may be used. Some of the most commonly utilized picking strategies include batch, wave, cluster, piece, zone and sortation picking. The most basic picking strategy, piece picking, is the process of pulling inventory for a single order. The ratio for this method is one picker to one order. Batch picking is more complex. Using this method a picker will pull inventory from multiple orders into one large container or tote. Once all orders have been picked the inventory will be taken to a staging area where orders will be separated into their corresponding containers. Cluster picking is similar to batch picking in that multiple orders are picked simultaneously, but are picked directly into their corresponding containers rather than a group tote. This eliminates the added labor required to separate orders in the staging area. Wave picking is a method facilitated by warehouse management technology. Groups of orders are released in “waves” on a schedule to ensure labor is evenly distributed throughout the work day. Both wave length and frequency is determined by staff availability and daily workload. Zone picking is an inventory picking method where staff are designated to zones in the warehouse and only pick from those areas. Zones can be designated by groupings of SKUs or by aisle. Using this method multiple orders will be picked from each zone simultaneously. This method allows for inventory handling specialization by employee where necessary. Sortation picking is reserved for supply chain operations with the existing automated storage and retrieval system architecture. In this method inventory is brought to pickers via a conveyor system where they put items into their corresponding containers. This significantly reduces the labor hours required to complete order fulfillment activities. The final picking strategy is picking to box. In this method pickers remain at their designated station and place items into boxes as they move past on a conveyor system. Each box may visit multiple picking stations before order fulfillment is complete. To learn more about which picking strategy may be best for your business contact Datex for a no obligation operational assessment.
Warehouse Operations and Inventory Management Thomas Tanel
Companies that make the best use of the basic principles of planning and managing warehouse operations and inventory management have a competitive advantage. Organizations that lack warehouse strategic planning and inventory operational excellence lose profits, market share, cost advantages, and market leadership.
Traditional Supply Chain and Logistics channels are indeed changing. As organizations move from mass production and mass distribution to mass customization, creative approaches are needed in the management of warehousing and inventory. The challenge is always present, because different customers may demand different levels of service. Demand often cannot be forecasted, especially if one must deliver customized products or services exactly where the customer needs them.
Businesses today must understand that they are competing on the basis of time more than on any other factor. The rigors of supply chain management require that you take action to meet your customers’ demand for faster, more frequent, and more reliable deliveries. Your suppliers need to meet increasingly precise inbound schedules. Tomorrow’s customers are more likely to be in another country or continent than they are likely to be from across town, in another state, or in another province.
With a proven inventory management system and an A-B-C Analysis, you can transform your inventory into a proactive force that lowers your inventory investment, reduces carrying costs, boosts confidence in physical supply and distribution service levels, and increases customer and user satisfaction. From a storage and distribution perspective, you, as overseer of the supply management process, should also know how the warehousing layout design criteria and the space and storage schemes affect your material flow, service levels, computerization, and technology options.
An immersive workshop at General Assembly, SF. I typically teach this workshop at General Assembly, San Francisco. To see a list of my upcoming classes, visit https://generalassemb.ly/instructors/seth-familian/4813
I also teach this workshop as a private lunch-and-learn or half-day immersive session for corporate clients. To learn more about pricing and availability, please contact me at http://familian1.com
Optimization of Assembly Line and Plant Layout in a Mass Production Industry...inventionjournals
International Journal of Engineering and Science Invention (IJESI) is an international journal intended for professionals and researchers in all fields of computer science and electronics. IJESI publishes research articles and reviews within the whole field Engineering Science and Technology, new teaching methods, assessment, validation and the impact of new technologies and it will continue to provide information on the latest trends and developments in this ever-expanding subject. The publications of papers are selected through double peer reviewed to ensure originality, relevance, and readability. The articles published in our journal can be accessed online.
Multi-Objective Forest Vehicle Routing Using Savings-Insertion and Reactive T...IJERA Editor
This paper focuses on how the competitiveness of forestry companies in Canada is impacted by forest products distribution and transportation costs, especially in the context of exports. We propose a new two steps approach, consisting in building a good initial solution and then improving it to solve multi-objective forest vehicle routing problem. The main objective of this paper is to solve a multi-objective forest vehicle routing problem using the Savings-insertion, followed by the Reactive tabu, with a variable threshold. To that end, first, a mathematical model is established; secondly, our new Savings-insertion builds a good initial solution, and thirdly, our new Reactive tabu with a variable threshold improves the initial solution. The three main objectives are the minimization of number of routes, the minimization of total distance and the minimization of total time by respecting the specified time window and the demand of all customers, which are sometimes important in this field. Finally, the experimental results obtained with our methodology for the named vehicle routing problem are provided and discussed
A MODEL FOR PRICING USED PRODUCTS AND REPLACEMENT PARTS IN REVERSE LOGISTICSijmvsc
A unique specification in remanufacturing is the uncertainty of returned flows. This makes the coordination
between supply and demand difficult for the firm. As a result, remanufacturers typically use pricing tools to
control the return flow of used products.
In this study, a model is presented for optimal quantity and price of used products and the price of used
products with replacement parts after collection and consolidation based on their quality levels. This model
was developed from the perspective of the remanufacturer and the consolidation center. When the
consolidation center receives the remanufacturer's demand, the consolidation center and the
remanufacturer use the proposed model for evaluating the optimal quantity and the acquisition price of
used products as well as the price provided by the remanufacturer to the consolidation center so that they
both reach maximum profit. The supply of used products is random. The presented model is an integer
nonlinear programming (INLP) model. Consequently, due to the complexity of the problem, The SA and GA
metaheuristic methods are used to solve the model
Automation of Material Handling: Design & Analysis of Bucket System on an Inc...IJRES Journal
Material handling systems are widely used in the industry for transportation of raw material, finished
product, storage and retrieval of materials. The increase cost of labor and manual work or operation is now
replaced by semiautomatic or automatic system. These low cost systems are not only cost efficient but also
enhance productivity & address the issues related to labor problem. Material handling equipment is designed
such that they make simple, economical, fast and safe loading and unloading with less human intervention. The
research work is related to develop an automated material Handling system MHS in the chemical Industry
where the bulk material transportation is done manually. The successful completion of this research work has
generated design and analysis of an automated bucket on inclined rail system for the chemical industry, which is
quick, efficient and safety to labor.
Optimization Approach of Vehicle Routing By a Milk-Run Material Supply Systemijsrd.com
Material handling is one of the most crucial issues that should be taken into account for eliminating waste and reducing the cost. The purpose of this research is to develop a mathematical model, which will be helpful to construct the routes and determine the service period for the design of milk-run material supply system. The material supply by this system occurs on a just-in-time basis from a central warehouse to several stations. Milk-run material supply system is the round trips are either goods collected from several suppliers and transported to one customer, or goods collected from one supplier and transported to several customers. Besides, it's intends to construct routes based on an initial service period value and attempts to improve the solution by considering different period values. The most suitable solution is decided on the basis of the least total material handling and inventory holding cost. The objective of the mathematical model is the minimization of the total material handling and inventory holding cost. These saving could be either use for reduction of the product cost, which will boost up the sales or to lift the company profit margin.
Unit-Operation Nonlinear Modeling for Planning and Scheduling ApplicationsAlkis Vazacopoulos
The focus of this chapter is to detail the quantity and quality modeling aspects of production flowsheets found in all process industries. Production flowsheets are typically at a higher-level than process flowsheets given that in many cases more direct business or economic related decisions are being made such as maximizing profit and performance for the overall plant and/or for several integrated plants together with shared resources. These decisions are usually planning and scheduling related, often referred to as production control, which require a larger spatial and temporal scope compared to more myopic process flowsheets which detail the steady or unsteady-state material, energy and momentum balances of a particular process unit-operation over a relatively short time horizon. This implies that simpler but still representative mathematical models of the individual processes are necessary in order to solve the multi time-period nonlinear system using nonlinear optimizers such as successive linear programming (SLP) and sequential quadratic programming (SQP). In this chapter we describe six types of unit-operation models which can be used as fundamental building blocks or objects to formulate large production flowsheets. In addition, we articulate the differences between continuous and batch processes while also discussing several other important implementation issues regarding the use of these unit-operation models within a decision-making system. It is useful to also note that the quantity and quality modeling system described in this chapter complements the quantity and logic modeling used to describe production and inventory systems outlined in Zyngier and Kelly (2009).
A MODEL-BASED APPROACH MACHINE LEARNING TO SCALABLE PORTFOLIO SELECTIONIJCI JOURNAL
This study proposes a scalable asset selection and allocation approach using machine learning that
integrates clustering methods into portfolio optimization models. The methodology applies the Uniform
Manifold Approximation and Projection method and ensemble clustering techniques to preselect assets
from the Ibovespa and S&P 500 indices. The research compares three allocation models and finds that the
Hierarchical Risk Parity model outperformed the others, with a Sharpe ratio of 1.11. Despite the
pandemic's impact on the portfolios, with drawdowns close to 30%, they recovered in 111 to 149 trading
days. The portfolios outperformed the indices in cumulative returns, with similar annual volatilities of
20%. Preprocessing with UMAP allowed for finding clusters with higher discriminatory power, evaluated
through internal cluster validation metrics, helping to reduce the problem's size during optimal portfolio
allocation. Overall, this study highlights the potential of machine learning in portfolio optimization,
providing a useful framework for investment practitioners.
On August 29, 2005, Hurricane Katrina devastated New Orleans and t.docxhopeaustin33688
On August 29, 2005, Hurricane Katrina devastated New Orleans and the Gulf coast. Proctor & Gamble coffee manufacturing, with brands such as Folgers that get over half of their supply from sites in New Orleans, was severely impacted by the hurricane. Six months later, there were, as a P&G executive told the New York Times “still holes on the shelves” where P&G’s brands should be. Given your new insights from supply chain management, how would you solve/avoid a situation like this?
Module 2 - Case
Supply Chain Design
Case Assignment
Welcome to the second case study for this course.
Assignment: Please read the article below (available through ProQuest), then in a 3-4 page paper discuss the article and integrated supply chains.
Assignment Expectations
The authors of the article do a pretty good job of explaining the concept but I would like you to tell me what they mean in your own words. What is an integrated supply chain? What are the key elements/challenges in an integrated supply chain? What are the specific benefits to firms that implement superior supply chain management?Write a 3-4 page paper, using the same format as module one.
Integrated supply chains to be exploredAlan Johnson. Manufacturers' Monthly. Sydney: May 2007. It is attached
Abstract:
"The key challenge is to integrate supply chain capabilities to provide a seamless solution from potential design through to end delivery. End users are looking for a complete supply chain where there is single accountability and responsibility for delivery," said O'[Brien].
Module 2 - Background
Supply Chain Design
The following information will give you a good background on the importance of having a properly designed supply chain. Please review the information presented below to assist you with the assignments. I encourage you to surf the internet for more information on supply chain design.
Required Materials
You are not required to read all of these articles, but you may if you wish to choose to read several to further your knowledge. You are encouraged to surf the internet to gather additional resources in order to research your topic more thoroughly.
Start off this module by reviewing the article below on Supply Chain Design.
Beamon, B. M. (1998). Supply Chain Design and Analysis: Models and Methods. International Journal of Production Economics, 55(3), 281-294. Accessed August 10, 2009, at http://www.sclgme.org
The ProQuestdata base provides the articles below concerning changing supply chains and supply chain security.
Johnson, A., (2007). Integrated supply chains to be explored. Manufacturers' Monthly. Sydney. Available in the Trident Online Library.
Rogers, D., Lockman, D., Schwerdt, G., O'Donnell, B., & Huff, R., (2004). Supply Chain Security. Material Handling Management, 59(2), 15-18. Available in the Trident Online Library.
Supply Chain Design and Analysis:
Models and Methods
Benita M. Beamon
University of Washington
Industrial Engineering
Box 352650
Seattle, WA 98195.
We are grateful to all JOSCM collaborators, associate editors, authors, reviewers and readers from this journal that help us, in many ways, to deliver the second edition of 2018. These eight papers illustrate from different theoretical and contextual perspectives some current topics in Operations Management and Supply Chain Management research such as risk management, international freight prices and health supply chain, among others. The last two papers are part of the Forum SIMPOI, which publishes the best papers from SIMPOI/2018 conference. I hope these papers bring relevant insights and advances for the development of our research area.
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Logistics and Supply Chain: An integrated production, inventory, warehouse location and distribution model
1. Submitted 06.03.2016. Approved 15.09.2016.
Evaluated by double blind review process.
AN INTEGRATED PRODUCTION,
INVENTORY, WAREHOUSE LOCATION
AND DISTRIBUTION MODEL
Lokendra Kumar Devangan
Masters in Industrial and Management Engineering from
the Indian Institute of Technology – Kanpur – Uttar Pradesh, India
lokendra2910@gmail.com
ABSTRACT: This paper proposes an integrated production and distribution planning optimization
model for multiple manufacturing locations, producing multiple products with deterministic demand
at multiple locations. There are multiple modes of transport from plants to demand locations and
warehouses. This study presents a model which allows decision makers to optimize plant production,
transport and warehouse location simultaneously to fulfill the demands at customer locations within a
multi-plant, multi-product, and multi-route supply chain system when the locations of the plants are
already fixed. The proposed model is solved for sample problems and tested using real data from a ce-
ment manufacturing company in India. An analysis of the results suggests that this model can be used
for various strategic and tactical production and planning decisions.
KEYWORDS: Supply chain management, integrated models, logistics, transshipment, warehouse location.
Volume 9 • Number 2 • July - December 2016 http:///dx.doi/10.12660/joscmv9n2p17-27
17
2. Devangan, L. K.: An Integrated Production, Inventory, Warehouse Location and Distribution Model
ISSN: 1984-3046 • Journal of Operations and Supply Chain Management Volume 9 Number 2 p 17 – 2718
1. INTRODUCTION
Extensive research has been performed to opti-
mize production planning, inventory, warehouse
location and vehicle routing, which have each been
addressed as independent problems by several re-
searchers (Fawcett & Magnan, 2002). Ganeshan and
Harrison (1995) classify supply chain functions into
four categories - location, production, inventory and
transportation. The independent modeling of sup-
ply chain functions has led to suboptimal solutions.
There have generally been tradeoffs between com-
putational efforts and optimality. Traditionally, in-
dependent optimization modeling of different stag-
es of the supply chain has been pursued mainly due
to limited computational resources.
With recent advances in terms of computational re-
sources, studies featuring an integrated approach
to modeling supply chain functions have been pro-
posed (Erengüç, Simpson, and Vakharia 1999, and
Kaur, Kanda, and Deshmukh, 2006). As manufac-
turing and economic conditions have become more
dynamic, there has been a greater need to study sup-
ply chain functions using an integrated approach in
terms of global supply chain operations. This ap-
proach is based on integrating the decision making
related to various functions - location, production,
inventory and distribution allocations - into a single
optimization problem. The fundamental objective of
this integrated approach is to optimize the variables
for various functions simultaneously instead of se-
quentially as they have been optimized in the past.
There are several advantages to integrated model-
ing such as reduced storage costs, less time spent
on product customization and greater visibility in
terms of demand.
This paper is organized as follows. The following
section presents a brief review of the literature in
the area of integrated supply chain optimization.
Next section presents the proposed integrated sup-
ply chain optimization model in detail. After that,
the results for problems of varying sizes including
a problem with real data are discussed. The final
section presents my conclusions and future av-
enues for research.
2. LITERATURE REVIEW
From the operational perspective, the issues of pro-
duction scheduling, inventory policy and distri-
bution routes have been modeled and optimized
separately (Fawcett & Magnan, 2002). Reviews of
integrated models for production, inventory and
distribution problems can be found in Erengüç et al.
(1999). Chandra and Fisher (1994) compare the com-
putational aspects of solving production and distri-
bution problems separately as opposed to using a
combined model. Dror and Ball (1987) and Chandra
(1993) address the coordination of the inventory and
distribution functions. Reviews of previous studies
of multi-period international facility supply chain
location problems have been provided by Canel
and Khumawala (1997). They formulate a mixed-
integer programming (MIP) model and solve it us-
ing a branch and bound design algorithm to decide
where to place manufacturing facilities and how
to determine production and shipping levels. Ca-
nel and Khumawala (2001) also develop a heuristic
procedure for solving this MIP model considering
a similar problem. Lei, Liu, Ruszczynski, and Park
(2006) use a two-phase method to simultaneously
solve the production, inventory, and routing prob-
lems. Fumero and Vercellis (1991) use Lagrangian
relaxation (LR) to solve an MIP model for the inte-
grated multi-period optimization of production and
logistics operations. They compare the results pro-
duced by modeling separately and in an integrated
fashion. To minimize costs in the integrated model,
they use Lagrangian relaxation (LR) to permit the
separation of the production and logistics functions.
In this decoupled approach, the production and lo-
gistics problems are solved independently in two
different optimization models. Pirkul and Jayara-
man (1996) develop a cost minimization problem
to model a multi-product, 3-echelon, plant capacity
and warehouse location problem. Lagrangian relax-
ation (LR) is used to find the lower bound and then a
heuristic method is used to solve the problem. Dasci
and Verter (2001) consider approximated costs and
demand to integrate the production and distribu-
tion functions. Closed form solutions are obtained
to minimize the fixed costs of facility location, op-
erations, and transport costs.
Arntzen, Brown, Harrison, and Trafton (1995) use a
branch and bound algorithm to solve a global supply
chain model at Digital Equipment Corporation for
multiple products, facilities, echelons, time periods,
and transport modes. They then solve it using branch
and bound enumeration. Kumanan, Venkatesan,
and Kumar (2007) develop two search techniques
to minimize total production and distribution costs
in a supply chain network. Camm et al. (1997) inte-
grate distribution-location problems and a product
sourcing problem as two supply chain problems at
3. Devangan, L. K.: An Integrated Production, Inventory, Warehouse Location and Distribution Model
ISSN: 1984-3046 • Journal of Operations and Supply Chain Management Volume 9 Number 2 p 17 – 2719
Proctor and Gamble. They use a geographical infor-
mation system along with integer programming and
network optimization models to solve the two sub-
problems. Dhaenens-Flipo and Finke (2001) model
a network flow problem to minimize the cost of a
supply chain within a multi-facility, multi-product
and multi-period environment. Sabri and Beamon
(2000) model stochastic demand, production and
supply lead-times in a multi-objective, multi-prod-
uct, and multi-echelon model to address strategic
and operational planning. Lodree, Jang, and Klein
(2004) propose the integration of customer waiting
time with the production and distribution functions
in the supply chain to determine the production rate
and the sequence of vehicle shipments.
Garcia, Sánchez, Guerrero, Calle, and Smith (2004)
and Silva et al. (2005) model an integrated optimiza-
tion problem for perishable products. Garcia et al.
(2004) consider a ready-mix concrete production and
distribution problem, in which the selection of orders
to be processed by a ready-mix concrete manufac-
turing plant has to be made, and orders have to have
a fixed due date and need to be delivered directly to
the customer site. Silva et al. (2005) also study a pro-
duction and distribution problem with ready-mix
concrete. Patel, Wei, Dessouky, Hao, and Pasakdee
(2009) propose a model to minimize the total cost of
distribution, storage, inventory and operations, and
the determining of production levels appropriate to
customer demand. They solve it using two heuristic
methods and are able to provide a solution close to
an optimal result which offers significant savings in
runtime. Jolayemi (2010) develops two versions of
a fully optimized model and a partially optimized
model for production-distribution and transporta-
tion planning in three stage supply chain scenarios.
Rong, Akkerman, and Grunow (2011) propose a
mixed integer programming model for the integra-
tion of food quality for production and distribution
in a food supply chain. They introduce the dynam-
ics of food degradation by considering factors like
storage temperature and transportation equipment
in the proposed model. Larbi, Bekrar, Trentesaux,
and Beldjilali (2012) formulate an integrated multi-
objective supply chain model for an Algerian com-
pany in modular form to minimize the cost and time
for quality control. Bashiri, Badri, and Talebi (2012)
present a mathematical model addressing strategic
and tactical planning in a multi-stage, multi-prod-
uct production-distribution supply chain network
and solve the optimization problem for illustrative
numerical problems. Cóccola, Zamarripa, Méndez,
and Espuña (2013) and Tang, Goetschalckx, and Mc-
Ginnis (2013) propose an integrated production and
distribution supply chain problem as a cost minimi-
zation problem applied to the chemical and aircraft
manufacturing industries. Yu, Normasari, and Lu-
ong (2015) develop a cost minimization problem for
small and medium size companies to decide how
many plants and distribution centers to open and
where to open them for a multi-stage supply chain
network. Maleki and Cruz-Machado (2013) present
a review of the integrated supply chain model and
identify theoretical gaps in the integration model.
3. THE INTEGRATED PRODUCTION AND DIS-
TRIBUTION PLANNING MODEL
3.1 Problem statement
In this study, we have developed an integrated
production and distribution planning (IPDP) op-
timization model for a multi-product, multi-plant,
multi-location and multi-echelon supply chain en-
vironment with multiple transport options includ-
ing railways and roads. The manufacturing plants
have the capacity to produce any product combina-
tion within the company’s portfolio. The production
capacity at the plant is shared among all the prod-
ucts which means that plants do not possess sepa-
rate production lines for each type of product. In
the literature, two types of costs are defined for any
production plant. First we have fixed costs which
include administrative costs and construction costs,
etc. Second, we have variable input costs which de-
pend on the quantity of the product manufactured.
The production costs are made up of labor costs, the
costs of procuring raw materials, packaging costs
and costs related to the processing of the raw materi-
als to produce the finished product. In this study, we
assume that the unit production costs and unit pack-
aging costs have been computed in such a way that
they also account for the associated fixed costs of
production and the packaging of the products at the
plant. These costs vary from plant to plant due to lo-
cal geopolitical and economic reasons. The distances
between the manufacturing plants to the customer
locations, between the plants to the warehouse, and
between the warehouse and the customer locations
are assumed to be known. Hence, the unit transport
cost between two points is known which varies by
the mode of transport. In this study, we assume that
railways and roads are two of the types of transport
available. Since the transportation capacity by any
mode of transport from a plant to a warehouse or a
4. Devangan, L. K.: An Integrated Production, Inventory, Warehouse Location and Distribution Model
ISSN: 1984-3046 • Journal of Operations and Supply Chain Management Volume 9 Number 2 p 17 – 2720
customer location is bounded, we need to consider
the type of transport in the optimization model. The
warehouse inbound and outbound handling costs
are dependent on the mode of transport which also
makes this problem interesting. The implied unit
sales price and taxes vary at each location.
The integrated profit maximization model proposed
in this paper has been formulated as a mixed inte-
ger programming model which determines how to
allocate production and distribution to fulfill de-
mand at the customer location. The model also de-
termines where to place subcontracted warehouses,
and allows the user to decide the status of existing
warehouses as to whether they should continue or
end their operations. This model integrates the op-
timization of production, distribution, transport
and warehouse location. The integrated production
and distribution planning model is formulated as a
mixed integer programming model to optimize pro-
duction and distribution allocation within produc-
tion constraints, obeying transport capacity and the
given demand at various customer locations.
3.2 Assumptions
The assumptions for this integrated optimization
model are as follows:
i. Integrated production and distribution optimi-
zation has been developed for a planning hori-
zon period, which may be a month for example
ii. The variable, production and packaging costs
have been computed in such a way that they
also account for the associated fixed costs of
production and the packaging of the products
at the plant.
iii. Each plant does not the capacity to produce
every type of product.
iv. The total production capacity of a plant is shared
among all the types of products and each prod-
uct has its own limited capacity at each plant.
v. There is no inventory stored at the plants.
vi. Each plant can handle all types of packaging.
vii. The selling price for a product varies from
customer to customer depending on what has
been negotiated.
viii. Tax implications vary by customer location.
ix. A less than truckload (LTL) shipment is al-
lowed without any penalty.
x. Customer demands can be fulfilled by sup-
plying products directly from plants or ware-
houses.
3.3 The formulation of the model
The parameters and decision variables used to for-
mulate the model are described below:
Decision Variables
5. Devangan, L. K.: An Integrated Production, Inventory, Warehouse Location and Distribution Model
ISSN: 1984-3046 • Journal of Operations and Supply Chain Management Volume 9 Number 2 p 17 – 2721
Parameters
The profit maximizing objective function and constraints are expressed below:
Maximize
Subject to
6. Devangan, L. K.: An Integrated Production, Inventory, Warehouse Location and Distribution Model
ISSN: 1984-3046 • Journal of Operations and Supply Chain Management Volume 9 Number 2 p 17 – 2722
3.4 Model Interpretation
Equation (1) expresses the goal of the profit maximi-
zation problem which is a function of the revenue
from the customers, production costs, packaging
costs, transport costs, handling costs at warehous-
es, excise duty at retailers, and setup costs or rental
costs at warehouses. Equation (2) ensures that the
quantity of supply of any product type for any plant,
warehouse and customer demand location combi-
nation does not exceed the production capacity of
this product type at that plant. Equation (3) ensures
that the quantity of supply of all type of products
for any plant, warehouse and customer demand lo-
cation combination does not exceed the production
capacity of the plant. Equation (4) ensures that the
quantity of supply of a product with a given type of
packaging for any plant, warehouse and customer
demand location combination does not exceed the
packaging type capacity at that plant. Equation (5)
ensures that quantity of supply of any product for
any plant, warehouse and customer demand loca-
tion combination by a given mode of transport does
not exceed the transport capacity allocated for that
mode of transport. Equation (6) ensures that the
quantity of supply of a product type with a given
type of packaging for any plant, warehouse and
customer demand location combination does not
exceed the maximum demand for this product with
this given packaging type at that customer demand
location. Equation (7) ensures that the total of supply
of a product type with a given type of packaging for
any plant, warehouse and customer demand loca-
tion combination fulfills the minimum supply of the
product for the given packaging type as promised
for this customer demand location. This ensures the
attainment of a minimum service level agreement as
signed with the customer. Equation (8) ensures that
no inventory is stored at warehouses on a continual
basis and warehouses are used as a transshipment
point. Equation (9) ensures that decision variable δj
= 1 if warehouse wj
is used as a transshipment point.
4. IMPLEMENTATION AND ANALYSIS
4.1 Numerical Examples and Illustrations
In this subsection, I will discuss the two numeri-
cal examples used to illustrate the proposed mod-
el. The examples are based on supply chains with
three stages consisting of production units, ware-
houses and customer demand locations. The model
is solved both for two and three product types. A
summary of the results obtained for these different
problem sizes are shown in Table 4.1 below.
Table 1: Problem cases
Case
#
Plant
# Ware-
house
# Trans
Mode
# Item
type
# Pack-
aging
Type
# Location # Constraint
# Decision
Variable
# Itera-
tion
# Ware-
house
Located
1 2 2 2 2 2 10 104 354 56 0
2 3 5 2 3 2 50 659 4,985 436 4
3 9 318 2 2 4 4,783 16,811 141,068 10312 150
7. Devangan, L. K.: An Integrated Production, Inventory, Warehouse Location and Distribution Model
ISSN: 1984-3046 • Journal of Operations and Supply Chain Management Volume 9 Number 2 p 17 – 2723
From the table it is clear that the integrated production
and distribution planning model is able to solve prob-
lems of various sizes. Cases 1 and 2 are examples of op-
timization problems, whereas Case 3 is a real problem
involving a cement manufacturing company.
Case 1 optimizes the production and distribution
plan for 2 plants with a 10 location supply chain
with 2 types of products, 2 types of packaging, and
2 types of transport modes. It takes 56 iterations to
produce the optmimum solution. It does not pre-
scribe any warehouse as this is a simple supply
chain. Case 2 is an illustrative exmple for a rela-
tively more complex supply chain. The optimum
solution prescribes subcontracting 4 warehouses to
fullfill demand. Case 3 involves 9 plants and 4,783
customer demand locations with two products and
two modes of transport, and takes 10,312 iterations
to produce its optimum solution and ends up rec-
ommending the subcontracting of 150 warehouses.
So the proposed model recommends warehouses
as transhipment points for complex supply chains
whereas it does not for a simple supply chain.
Case 3 will be discussed in detail in the next subsec-
tion. All of the three cases were solved using SAS
OR software (SAS Institute Inc. (2011) and the time
taken for all of them was less than 2 minutes. OPT-
MODEL, an algebraic modeling language, was used
by the SAS/OR software to solve the problems. The
OPTMODEL procedure allows efficient program-
ming of large optimization problems. It uses the
branch and cut algorithm to solve the proposed MIP
optimization model.
4.2 Case study
The proposed model was implemented for a cement
manufacturing organization in India which has 9
manufacturing plants spread across the country
serving customers all over the country. Production
capacity data for each of the plants was collected
from the plant operation managers. The transporta-
tion cost, transportation capacity and demand data
were collected from the supply chain planning man-
agers. They also shared the data for minimum sup-
ply agreements and the selling price at different cus-
tomer locations. This cement manufacturer produces
two types of cement called OPC and PPC which are
sold in the market with four types of packaging. In
an emerging market like India, there are two types
of demand for cement: bulk and retail. The cement
manufacturing industry serves the demands of dif-
ferent geographical locations and has contracts with
dealers to serve end customers. Dealers are the cus-
tomers of this manufacturing company. They also
serve the bulk demands of the construction indus-
try. Manufacturing plants are set up near sources of
raw materials. The rate of demand is not constant
over time in each region as infrastructure construc-
tion activities move to different locations over time.
The proposed model which integrates production,
warehouse location and distribution planning is
ideal for scenarios where the rate of demand is not
constant in a region. The proposed model allows the
manufacturer to set up or subcontract warehouses to
act as transshipment points and serve the demands
of customers who are located very far away from the
manufacturing plants. The model has also integrat-
ed the minimum demand fulfillment agreement and
does not differentiate between bulk demand and re-
tail demand because the model has been formulated
as a profit maximization model.
How best to configure cement production, distribu-
tion and warehouse planning has been solved using
real data collected from this manufacturing organiza-
tion. There are 4,783 demand locations and 9 cement
plants to serve demand. 318 is the number of ware-
houses available to be used as transshipment points.
Railways and roads are two of the transport modes.
In reality every plant is connected to every ware-
house and demand location, but transport cost data
is not available for some of the routes. In the baseline
scenario, the total demand is 781,321 tons and the ob-
jective value is 2,861,932,772 INR. 0.02% of demand is
not fulfilled due to lack of transportation route data.
The total number of iterations required to solve the
problem was 10,312 using a four thread 32GB RAM
machine. The optimized solution recommends 150
warehouses. The overall utilization rate is 67%, and
there are two plants which are highly underutilized
(<=30%), and four plants with high utilization (>80%).
The results obtained using real data from this manu-
facturing company are in sync with the geographical
locations of the plant, warehouse and customer lo-
cations. The nearer customer locations are supplied
directly from the plant, whereas customer locations
that are farther away get supplied by the warehous-
es. The warehouses are supplied by various plants.
The discussion of these results with plant managers
also suggests a reduction in the cost components.
The results also suggest that the optimal number of
warehouses required is substantially smaller than
the number of warehouses operating currently.
8. Devangan, L. K.: An Integrated Production, Inventory, Warehouse Location and Distribution Model
ISSN: 1984-3046 • Journal of Operations and Supply Chain Management Volume 9 Number 2 p 17 – 2724
4.3 Sensitivity analysis
In a given process, a utilization rate of more than
80% strains the entire process. Table 2 shows the ob-
jective value for different levels of demand in pro-
portion to baseline demand, and Table 3 shows plant
Table 2 Objective value for different levels of demand
Iteration %Profit %Demand Overall Plant Utilization # Warehouses
.80*Baseline 79.99% 99.980% 53% 147
.90*Baseline 89.93% 99.980% 60% 148
Baseline Demand 100.00% 99.980% 67% 150
1.10*Baseline 109.85% 99.979% 73% 153
1.20*Baseline 119.55% 99.980% 80% 154
1.30*Baseline 128.84% 99.980% 87% 153
utilization at different levels of demand. Approxi-
mately 100% of demand is fulfilled in all of the levels
considered. Though the overall utilization rate rang-
es from 53% to 87%, plant P4 is always 100% utilized
for economic reasons, whereas plants P7 and P9 are
the least utilized in every case.
Table 3 Utilization for different levels of demand
Scenario/Plants P1 P2 P3 P4 P5 P6 P7 P8 P9
.80*Baseline 61% 83% 64% 100% 45% 42% 17% 62% 24%
.90*Baseline 69% 100% 83% 100% 52% 48% 19% 70% 27%
Baseline Demand 83% 100% 100% 100% 60% 53% 21% 80% 30%
1.10*Baseline 100% 100% 100% 100% 89% 59% 24% 92% 33%
1.20*Baseline 100% 100% 100% 100% 100% 77% 34% 100% 43%
1.30*Baseline 100% 100% 100% 100% 100% 99% 47% 100% 48%
These observations have been used to create differ-
ent scenarios for production capacities which are
applicable to the manufacturing industry. Solu-
tions to these scenarios are helpful in production
planning and affect profitability in different situa-
tions. The objective value and utilization of each of
the plants in these scenarios are presented in Tables
4 and 5. The production capacity scenarios are dis-
cussed below:
a. Scenario: All 9 of the plants are operating at 90%
of production capacity. This is analogous to the
situation that occurs when plants undergo peri-
odic maintenance activities.
b. Scenario: Plant P7 is closed. The utilization of
plant P7 is only 21% for the baseline demand
case. Management may want to close this plant.
c. Scenario: Plants P7 & P9 are closed. Similar
to P7, plant P9 is also highly underutilized.
Management may decide to close both of
these plants.
d. Scenario: Plants P7 & P9 are closed, and plants
P2, P3 & P4 are operating at 90% of production
capacity. The remaining plants are operating at
100% capacity. This is analogous to the situa-
tion that occurs when P7 and P9 are closed and
100% of the utilized plants are available with
90% capacity occurring due to maintenance ac-
tivities.
e. Scenario: Plant P4 is closed. Plant P4 is the most
economical plant, and is 100% utilized even
when demand is at 80%. This plant will have to
be shut down for maintenance due to a critical
breakdown situation.
f. Scenario: Plant P4 is closed and plants P1, P2,
P3, P5 & P8 are operating at 90% due to mainte-
nance activities.
9. Devangan, L. K.: An Integrated Production, Inventory, Warehouse Location and Distribution Model
ISSN: 1984-3046 • Journal of Operations and Supply Chain Management Volume 9 Number 2 p 17 – 2725
Table 4 Utilization for different production capacity
Plant Code
Baseline
Utilization
a) Scenario b) Scenario c) Scenario d) Scenario e) Scenario f) Scenario
P1 83% 90% 88% 91% 96% 100% 90%
P2 100% 90% 100% 100% 90% 100% 90%
P3 100% 90% 100% 100% 90% 100% 90%
P4 100% 90% 100% 100% 90%
P5 60% 84% 60% 75% 100% 100% 90%
P6 53% 54% 61% 69% 72% 77% 90%
P7 21% 23% 34% 45%
P8 80% 84% 80% 81% 85% 100% 90%
P9 30% 30% 40% 35% 37%
Objective
Value
100% 99% 98% 98% 100% 96% 95%
Table 5 Objective value for different production capacities
Scenarios Objective Value as % of Baseline Objective # Warehouses
a) Scenario 98.79% 145
b) Scenario 97.78% 144
c) Scenario 97.63% 143
d) Scenario 99.87% 152
e) Scenario 95.79% 150
f) Scenario 95.07% 150
5. THE OPTMODEL PROCEDURE IN SAS /OR
The data manipulation ability of SAS software
makes it easy to handle problems of any size. In the
implementation of Case 3 in which real data is used,
plant managers know that all plants are not connect-
ed by usable transportation routes to the destination
points (customer locations or warehouses) hence all
possible combinations are not present in the data
used for transportation costs. Also it is known from
the expected demand data that all customer loca-
tions will not have demand for all types of products.
In such problems the number of constraint and deci-
sion variables cannot be correctly enumerated using
permutations and combinations. Considering all the
combinations in the programming, some of which
are infeasible, also reduces its efficiency as it does
not add any value to the objective function. These
kinds of challenges in real problems can be very eas-
ily programmed using SAS OPTMODE to solve in-
tegrated optimization problems. The OPTMODEL
procedure is discussed briefly in the next subsection.
6. CONCLUSIONS AND FUTURE WORK
The model proposed in this study determines the
optimal integrated production, warehouse location
and distribution planning as part of a profit maximi-
zation problem. Other studies in the literature have
formulated the integrated optimization problem as
a cost minimization problem. The analysis of solu-
tions for a large real supply chain problem involv-
ing a cement manufacturing company shows that
complex supply chains can be modeled and have
good performance. This study presents a model that
enables decision makers to simultaneously optimize
product and customer allocations and warehouse
locations within a multi-plant, multi-product and
multi-route supply chain system. The various sce-
narios discussed in terms of sensitivity analysis are
useful in understanding what leverages profitability
and redundant production capacity. These scenarios
are highly relevant in a manufacturing industry. In
the electronics, apparel and food processing indus-
tries, where a large variety of products is produced
10. Devangan, L. K.: An Integrated Production, Inventory, Warehouse Location and Distribution Model
ISSN: 1984-3046 • Journal of Operations and Supply Chain Management Volume 9 Number 2 p 17 – 2726
and transported to many market locations, the pro-
posed integrated production and distribution plan-
ning model is highly relevant. The model is also
useful for planning annual maintenance work or
temporary plant shutdowns. In the presented ap-
proach demand is deterministic. This can be fore-
casted periodically using historical sales data, and
then it can be used as input into proposed models
of supply chain optimization. Future research deal-
ing with stochastic demand and the lead time in the
model for perishable items would be useful. The
proposed model can also be extended to consider
the penalties that result from half truck loads and
routing decisions in the integrated model.
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