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Articles 1 - 15 of 15
Full-Text Articles in Business
On The Demand Distributions Of Spare Parts, A A. Syntetos, M Z. Babai, Nezih Altay
On The Demand Distributions Of Spare Parts, A A. Syntetos, M Z. Babai, Nezih Altay
Nezih Altay
Spare parts have become ubiquitous in modern societies, and managing their requirements is an important and challenging task with tremendous cost implications for the organisations that are holding relevant inventories. Demand for spare parts arises whenever a component fails or requires replacement, and as such the relevant patterns are different from those associated with ‘typical’ stock keeping units. Such demand patterns are most often intermittent in nature, meaning that demand arrives infrequently and is interspersed by time periods with no demand at all. A number of distributions have been discussed in the literature for representing these patterns, but empirical evidence …
Effects Of Correlation On Intermittent Demand Forecasting And Stock Control, Nezih Altay, Lewis A. Litteral, Frank Rudisill
Effects Of Correlation On Intermittent Demand Forecasting And Stock Control, Nezih Altay, Lewis A. Litteral, Frank Rudisill
Nezih Altay
This study investigates the effects of three different types of correlation on forecasting and stock control of intermittent demand items. Applying appropriate forecasting and stock control methods to theoretically generated compound Poisson demand data we show that correlation in intermittent demand does play a role in forecast quality and stock control performance. Negative autocorrelation levels lead to higher service levels than positive values, while cost does not significantly change. Our results also show that high intermittency levels intensify these changes in service level. We also show that cross-correlation produces results in the opposite direction of autocorrelation in size or intervals; …
Distributional Assumptions For Parametric Forecasting Of Intermittent Demand, Aris Syntetos, M. Babai, David Lengu, Nezih Altay
Distributional Assumptions For Parametric Forecasting Of Intermittent Demand, Aris Syntetos, M. Babai, David Lengu, Nezih Altay
Nezih Altay
No abstract provided.
Humanitarian Logistics And The Cluster Approach: Global Shifts And The U.S. Perspective, Nezih Altay, Melissa Labonte
Humanitarian Logistics And The Cluster Approach: Global Shifts And The U.S. Perspective, Nezih Altay, Melissa Labonte
Nezih Altay
There is growing recognition among key humanitarian organizations that logistics plays an essential role in achieving greater synergies across and within the myriad of actors and institutions that currently constitute the humanitarian industry. In this chapter we examine the implications resulting from the establishment of the United Nations’ Cluster Approach strategy in responding to complex humanitarian emergencies. Specifically, we analyse the evolution of the Logistics Cluster with respect to key factors such as preparedness, coordination, accountability, and information and knowledge management. In the five years and 36 country roll-outs since its establishment, the Logistics Cluster gets high marks operationally for …
An Operational Framework For Mortgage Supply Chains, Juri Hirschey, Patricia Wescott, Nezih Altay
An Operational Framework For Mortgage Supply Chains, Juri Hirschey, Patricia Wescott, Nezih Altay
Nezih Altay
Operations management in the mortgage banking industry requires a strategic framework that takes into account the industry’s volatility, operational complexity and unique customer model. The foundation of this framework begins by (re)defining the mortgage lender’s customer to include the capital markets. This paper proposes a novel model for managing mortgage banking operations, a model that uniquely reveals two different but intricately related supply chains in mortgage operations. The proposed dual-direction supply chain model offers speed and flexibility with one supply chain and integration and market knowledge with the other – the combination of which is critical to developing an effective …
Impact Of Disasters On Firms In Different Sectors: Implications For Supply Chains, Nezih Altay, Andres Ramirez
Impact Of Disasters On Firms In Different Sectors: Implications For Supply Chains, Nezih Altay, Andres Ramirez
Nezih Altay
Disasters keep damaging infrastructure, disrupting supply chains and affecting firm profitability. There is an urgent need for better understanding of disaster impact on supply chains but very few publications address this issue. This exploratory study takes an indirect approach and investigates disaster impact on firms in various industry sectors. This approach allows us to take full advantage of large secondary data bases of firm and disaster data in order to analyze the impact of over 3,500 disasters on more than 100,000 firm-year observations over 15 years. Our results indicate that disasters impact all sectors within a supply chain. We found …
Strategic Planning For Disaster Relief Logistics: Lessons From Supply Chain Management, Nezih Altay, Sameer Prasad, Jayavel Sounderpandian
Strategic Planning For Disaster Relief Logistics: Lessons From Supply Chain Management, Nezih Altay, Sameer Prasad, Jayavel Sounderpandian
Nezih Altay
Abstract: Management of disaster relief logistics requires different techniques at different levels. We identify four stages: 1 strategic planning which concerns high level decisions such as supplier selection and confirmation of communication protocols 2 preparedness which concerns decisions regarding the amount and location of relief supplies to be stored 3 pre-event response which concerns decisions during those occasions when an approaching disaster, such as a hurricane, has been detected 4 post-event response which concerns what needs to be done immediately after a disaster has occurred. In this article, we concentrate on the strategic planning stage and build an integrated logistics …
Issues In Disaster Relief Logistics, Nezih Altay
A Comparative Study Of Modeling And Solution Approaches For The Coordinated Lot-Size Problem With Dynamic Demand, Li-Lian Gao, Nezih Altay, Powell Robinson
A Comparative Study Of Modeling And Solution Approaches For The Coordinated Lot-Size Problem With Dynamic Demand, Li-Lian Gao, Nezih Altay, Powell Robinson
Nezih Altay
In the coordinated lot-size problem, a major setup cost is incurred when at least one member of a product family is produced and a minor setup cost for each different item produced. This research consolidates the various modeling and algorithmic approaches reported in the literature for the coordinated replenishment problem with deterministic dynamic demand. For the two most effective approaches, we conducted extensive computational experiments investigating the quality of the lower bound associated with the model’s linear programming relaxation and the computational efficiency of the algorithmic approaches when used to find heuristic and optimal solutions. Our findings indicate the superiority …
Exact And Heuristic Solution Approaches For The Mixed Integer Setup Knapsack Problem, Nezih Altay, Powell Robinson, Kurt Bretthauer
Exact And Heuristic Solution Approaches For The Mixed Integer Setup Knapsack Problem, Nezih Altay, Powell Robinson, Kurt Bretthauer
Nezih Altay
We consider a class of knapsack problems that include setup costs for families of items. An individual item can be loaded into the knapsack only if a setup cost is incurred for the family to which it belongs. A mixed integer programming formulation for the problem is provided along with exact and heuristic solution methods. The exact algorithm uses cross decomposition. The proposed heuristic gives fast and tight bounds. In addition, a Benders decomposition algorithm is presented to solve the continuous relaxation of the problem. This method for solving the continuous relaxation can be used to improve the performance of …
Adapting Wright’S Modification Of Holt’S Method To Forecasting Intermittent Demand, Nezih Altay, Frank Rudisill, Lewis A. Litteral
Adapting Wright’S Modification Of Holt’S Method To Forecasting Intermittent Demand, Nezih Altay, Frank Rudisill, Lewis A. Litteral
Nezih Altay
The challenge of accurately forecasting demand for spare parts is due to the intermittent nature of their demand. This study compares a recent modification of Croston’s method and a method based on Holt’s double exponential smoothing taking the firm’s competitive priorities into consideration. Wright’s modification of Holt’s method is presented as a viable alternative when forecasting demand for spares especially when trend is present. Results indicate that firms focusing on minimizing inventory levels as a priority should consider forecasting using the Modified Croston’s method. If their priority is high customer service, then the modified Holt’s method is superior.
The Sox-Rfid Connection”, Nezih Altay, Porcher Taylor Iii
The Sox-Rfid Connection”, Nezih Altay, Porcher Taylor Iii
Nezih Altay
RFID, radio frequency identification, can help companies improve their supply chain operations and facilitate compliance with the Sarbanes-Oxley Act. The key is in the implementation. And the key to implementation lies in the integration of the company's enterprise resource planning (ERP) system.
Delineating The ‘‘Ease Of Doing Business’’ Construct Within The Supplier–Customer Interface, Gary Stading, Nezih Altay
Delineating The ‘‘Ease Of Doing Business’’ Construct Within The Supplier–Customer Interface, Gary Stading, Nezih Altay
Nezih Altay
The current research provides insight into the ‘‘ease of doing business’’ construct. Factor analysis of survey responses of supply managers in the electronics industry was used to test the proposed ‘‘ease of doing business’’ construct, which includes the three dimensions — information and material services, financial contract services and personal relations services. Results support a link between a customer’s assessment of a supplier’s ‘‘ease of doing business’’ and the amount of business conducted with that supplier. The attributes supported by this research provide the means for managers to improve and grow business with customers.
Or/Ms Research In Disaster Operations Management, Nezih Altay, Walter G. Green
Or/Ms Research In Disaster Operations Management, Nezih Altay, Walter G. Green
Nezih Altay
Disasters are large intractable problems that test the ability of communities and nations to effectively protect their populations and infrastructure, to reduce both human and property loss, and to rapidly recover. The seeming randomness of impacts and problems and uniqueness of incidents demand dynamic, real-time, effective and cost efficient solutions, thus making the topic very suitable for OR/MS research. While social sciences and humanities literatures enjoy an abundance of articles on disaster management, the OR/MS community is yet to produce a critical mass. In this paper, we survey the literature to identify potential research directions in disaster operations, discuss relevant …
Improving Disaster Response Efforts With Decision Support Systems, Steven Thompson, Nezih Altay, Walter G. Green Iii, Joanne Lapetina
Improving Disaster Response Efforts With Decision Support Systems, Steven Thompson, Nezih Altay, Walter G. Green Iii, Joanne Lapetina
Nezih Altay
As evidenced by Hurricane Katrina in August, 2005, disaster response efforts are hindered by a lack of coordination, poor information flows, and the inability of disaster response managers to validate and process relevant information and make decisions in a timely fashion. A number of factors contribute to current lacklustre response efforts. Some are inherent to the complex, rapidly changing decision-making environments that characterise most disaster response settings. Others reflect systematic flaws in how decisions are made within the organisational hierarchies of the many agencies involved in a disaster response. Slow, ineffective strategies for gathering, processing, and analysing data can also …