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Full-Text Articles in Engineering
Dynamic Kanban System For Disassembly Line Applied To An Industrial Voice Recognition Client Unit, Surendra Gupta, Elif Kizilkaya
Dynamic Kanban System For Disassembly Line Applied To An Industrial Voice Recognition Client Unit, Surendra Gupta, Elif Kizilkaya
Surendra M. Gupta
In this paper, we apply the Dynamic Kanban System for Disassembly Line (DKSDL) to an industrial setting. The product considered is a second-generation industrial voice recognition client unit. The company manufacturing this device has moved on to the next generation device, which has more memory, faster CPU and a standardized OS support. There are many of the older generation clients in the customer base, which are being upgraded to the new generation resulting in a large number of the older units at hand. These units are being returned to the manufacturing facility to be processed. The casing and some other …
Multi-Criteria Decision Making For Disassembly-To-Order System Under Stochastic Yields, Surendra Gupta
Multi-Criteria Decision Making For Disassembly-To-Order System Under Stochastic Yields, Surendra Gupta
Surendra M. Gupta
In this paper, we consider the problem of determining the optimal number of returned products to disassemble to fulfill the demand for a specified number of parts. This is known as the disassembly-to-order (DTO) problem. The deterministic yield version of this problem has been addressed in the literature. Recently, the stochastic yield version of this problem with a single objective has also been reported in the literature. In this paper, we extend the methodology to include multiple objectives. To this end, we model the DTO problem using integer goal programming. The stochastic problem is solved by transforming it into its …
Selection Of Collection Centers And Recovery Facilities For Designing A Reverse Supply Chain, Surendra Gupta, Gupta Sushil, Pochampally Kishore
Selection Of Collection Centers And Recovery Facilities For Designing A Reverse Supply Chain, Surendra Gupta, Gupta Sushil, Pochampally Kishore
Surendra M. Gupta
The designing of a reverse supply chain must involve selection of collection centers and recovery facilities that have sufficient success potentials. These success potentials depend heavily on the participation of the following three important groups who have multiple, conflicting, and incommensurate criteria for evaluation, and so, the potentials must be evaluated based on the maximized consensus among those groups: (i) Consumers (whose primary concern is convenience), (ii) Local government officials (whose primary concern is environmental consciousness), and (iii) Supply chain company executives (whose primary concern is profit). In this paper, we propose a three-phase multi-criteria group approach to select collection …
Environmental Practices Of The Auxiliary Companies To The Spanish Automobile Industry, Surendra Gupta, Pilar Gonzalez-Torrea, Beatriz Gonzalez
Environmental Practices Of The Auxiliary Companies To The Spanish Automobile Industry, Surendra Gupta, Pilar Gonzalez-Torrea, Beatriz Gonzalez
Surendra M. Gupta
The automobile manufacturing industry plays a very important role in a country's economy. The importance of automobile manufacturing industry lies in its sheer size and complexity in terms of the direct and indirect influence it commands across many other industries. While millions of people are employed in the automobile manufacturing industry, it is estimated that more than two and half times that number are employed in the auxiliary companies that supply parts to the automobile manufacturing companies. The auxiliary companies represent a group of businesses of various sizes, types, and geographical locations, producing a vast variety of products ranging from …
Use Of Flexible Kanban For Material Flow Control In A Disassembly Process, Surendra Gupta, Elif Kizilkaya
Use Of Flexible Kanban For Material Flow Control In A Disassembly Process, Surendra Gupta, Elif Kizilkaya
Surendra M. Gupta
Disassembly is one of the proposed solutions to the increased environmental problem of large-scale disposal of manufactured products. Disassembly process brings with it a lot of unresolved material control issues. In this paper we illustrate the implementation of the recently developed Flexible Kanban System to cope with the uncertainties that are unique to the disassembly system.
Multi-Criteria Decision Making Approach In Multiple Periods For A Disassembly-To-Order System Under Product's Deterioration And Stochastic Yields, Surendra Gupta, Prasit Imtanavanich
Multi-Criteria Decision Making Approach In Multiple Periods For A Disassembly-To-Order System Under Product's Deterioration And Stochastic Yields, Surendra Gupta, Prasit Imtanavanich
Surendra M. Gupta
In this paper, we concentrate on the disassembly-to-order (DTO) system, where end-of-life (EOL) products are taken back from last users to be disassembled to fulfill the demands for components and materials. The objective is to determine the number of EOL products that would be needed to maximize the profit and minimize the costs of the system. The conditions of EOL products are not always certain, which makes the problem difficult. We use a heuristic approach which transforms the stochastic disassembly yields into their deterministic equivalents and use a multi-criteria decision-making technique to solve the problem. In addition, we take the …
Computational Complexity Of A Reverse Manufacturing Line, Surendra Gupta, Seamus Mcgovern
Computational Complexity Of A Reverse Manufacturing Line, Surendra Gupta, Seamus Mcgovern
Surendra M. Gupta
Disassembly has recently gained attention in the literature due to its role in product recovery. Disassembly activities take place in various recovery operations including remanufacturing, recycling, and disposal. The disassembly line is the best choice for automated disassembly of returned products. It is therefore important that the disassembly line be designed and balanced so that it works as efficiently as possible. However, finding the optimal balance is computationally intensive with exhaustive search quickly becoming prohibitively large, even for relatively small products, due to exponential growth. In this paper, complexity theory is reviewed and used to prove that the DISASSEMBLY LINE …
Multi-Criteria Ant System And Genetic Algorithm For End-Of-Life Decision Making, Surendra Gupta, Seamus Mcgovern
Multi-Criteria Ant System And Genetic Algorithm For End-Of-Life Decision Making, Surendra Gupta, Seamus Mcgovern
Surendra M. Gupta
Disassembly takes place in remanufacturing, recycling, and disposal with a line being the best choice for automation. The disassembly line balancing problem seeks a sequence which: is feasible, minimizes workstations, and ensures similar idle times, as well as other, disassembly-specific concerns. Finding the optimal balance is computationally intensive due to factorial growth. Ant colony optimization and genetic algorithm metaheuristics are presented and compared along with an exa mple to illustrate the implementation. Conclusions drawn include the consistent generation of optimal or near-optimal solutions, the ability to preserve precedence, the speed of the metaheuristics, and their practicality due to ease of …
Sudden Material Handling System Breakdown In A Disassembly Line, Surendra Gupta, Elif Kizilkaya
Sudden Material Handling System Breakdown In A Disassembly Line, Surendra Gupta, Elif Kizilkaya
Surendra M. Gupta
In this paper we study the effect of the sudden breakdown of material handling equipment on the performance of recently introduced MKSD (Modified Kanban System for Disassembly). We also study behavior of a newly developed JIT system for disassembly called DKSDL (Dynamic Kanban System for Disassembly Line) under the same conditions. DKSDL dynamically adjusts the number of disassembly production kanbans in or der to offset blocking and starvation caused by these factors during a disassembly cycle. We compare the overall performances of the MKSD and the DKSDL models under different scenarios. The scenario settings, approach to the solution, results and …
A Structured Analysis Of Mrp Systems Under Supply Uncertainty, Surendra Gupta, Louis Brennan
A Structured Analysis Of Mrp Systems Under Supply Uncertainty, Surendra Gupta, Louis Brennan
Surendra M. Gupta
One of the major issues affecting the real life performace of MRP is the existence of uncertainties in the maufacturing environment. Lead time uncertainties arising from supplier behavior and process unpredictability are examples of such phenomena. This paper presents an analysis of the operation of MRP systems in the presence of supply and process uncertainties. A simulation model is employed to explore the influence of such uncertainties and their interaction with other factors. The shape of the product structure and the lot-sizing technique used are found to significantly impact performace in the presence of supply uncertainties.
Pricing End-Of-Life Components, Surendra Gupta, Srikanth Vadde, Sagar Kamarthi
Pricing End-Of-Life Components, Surendra Gupta, Srikanth Vadde, Sagar Kamarthi
Surendra M. Gupta
The main objective of a product recovery facility (PRF) is to disassemble end-of-life (EOL) products and sell the reclaimed components for reuse and recovered materials in second-hand markets. Variability in the inflow of EOL products and fluctuation in demand for reusable components contribute to the volatility in inventory levels. To stay profitable the PRFs ought to manage their inventory by regulating the price appropriately to minimize holding costs. This work presents two deterministic pricing models for a PRF bounded by environmental regulations. In the first model, the demand is price dependent and in the second, the demand is both price …
A Fuzzy Ahp-Based Approach For Selecting Potential Recovery Facilities In A Closed Loop Supply Chain, Surendra Gupta, Satish Nukala
A Fuzzy Ahp-Based Approach For Selecting Potential Recovery Facilities In A Closed Loop Supply Chain, Surendra Gupta, Satish Nukala
Surendra M. Gupta
In this paper, we employ fuzzy AHP methodology for selecting potential recovery facilities in a closed-loop supply chain. This methodology utilizes triangular fuzzy numbers for pair-wise comparisons and the extent analysis method for the synthetic extent value of the fuzzy pair-wise comparisons and principle of comparison of fuzzy numbers to derive the weight vectors to address the criticism traditional AHP often faces due to its unbalanced scale of judgments and inability to handle inherent uncertainty in carrying out pair-wise comparisons. A numerical example is considered to illustrate the methodology.
Uncertainty And Back-Ordering In Multi-Level Product Structures, Surendra Gupta, Louis Brennan
Uncertainty And Back-Ordering In Multi-Level Product Structures, Surendra Gupta, Louis Brennan
Surendra M. Gupta
The influence of uncertainty on the performance of Material Requirements Planning (MRP) systems has been the focus of several studies. All of these studies have incorporated non back-order lot sizing rules. However, attention has been recently directed to back-order lot sizing rules. This paper considers the impact of the presence of both supply and demand uncertainties on the performance of MRP systems in an environment where back-orders are planned. The word reported here is based on a simulation study involving a variety of supply and demand conditions. The study establishes the significance of product structure shape and variant, lot sizing …
Pricing Decisions For Product Recovery Facilities In A Multi-Criteria Setting Using Genetic Algorithms, Surendra Gupta, Srikanth Vadde, Sagar Kamarthi
Pricing Decisions For Product Recovery Facilities In A Multi-Criteria Setting Using Genetic Algorithms, Surendra Gupta, Srikanth Vadde, Sagar Kamarthi
Surendra M. Gupta
Independent and small scale product recovery facilities (PRFs) often struggle to achieve profits when faced with inconsistent inflows of discarded products, varying demand patterns for recovered components, and stringent environmental regulations. Inconsistent inflows coupled with the varying demand cause undue fluctuations in inventory levels and frequently affect costs involved in product recovery operations. An effective pricing strategy can stabilize the fluctuations in demand and consequently can allow PRFs to control inventory levels. This research determines the prices of reusable and recyclable components and acquisition price of discarded products that allow PRFs to simultaneously maximize their financial returns and minimize the …
Genetic Algorithm For Disassembly Process Planning, Surendra Gupta
Genetic Algorithm For Disassembly Process Planning, Surendra Gupta
Surendra M. Gupta
When a product reaches it's end-of-life, there are several options available for processing it including reuse, remanufacturing, recycling, and disposing (the least desirable option). In almost all cases, a certain level of disassembly may be necessary. Thus, finding an optimal (or near optimal) disassembly sequence is crucial to increasing the efficiency of the process. Disassembly operations are labor intensive, can be costly, have unique characteristics and cannot be considered as reverse of assembly operations. Since the complexity of determining the best disassembly sequence increases with the increase in the number of parts of the product, it is extremely crucial that …