Alireza Amirteimoori
Department of Applied Mathematics, Islamic Azad University, Rasht Branch, Rasht, Iran
[ 1 ] - A Method for Solving Super-Efficiency Infeasibility by Adding virtual DMUs with Mean Values
Using super-efficiency, with regard to ranking efficient units, is increasing in DEA. However, this model has some problems such as the infeasibility. Thus, this article studies infeasibility of the input-based super-efficiency model (because of the zero inputs and outputs), and presents a solution by adding two virtual DMUs with mean values (one for inputs and one for outputs). Adding virtual ...
[ 2 ] - Ranking of bank branches with undesirable and fuzzy data: A DEA-based approach
Banks are one of the most important financial sectors in order to the economic development of each country. Certainly, efficiency scores and ranks of banks are significant and effective aspects towards future planning. Sometimes the performance of banks must be measured in the presence of undesirable and vague factors. For these reasons in the current paper a procedure based on data envelopment...
[ 3 ] - Weak Disposability in Integer-Valued Data Envelopment Analysis
Conventional data envelopment analysis (DEA) models normally assume all inputs and outputs are real valued and continuous. However in problems some inputs and outputs can only take integer values, also, both desirable and undesirable outputs can be generated . In this paper the effect of undesirable outputs in integer DEA model is discussed. The proposed model distinguishes weak disposability o...
[ 4 ] - رویکردی نوین برای محاسبه تراکم با ویژگی دسترسی‌پذیری ضعیف خطی خروجی‌های نامطلوب
در سال‌های اخیر، مسئله‌ی تراکم از موضوعات مورد توجه محققان بوده است. هنگامی که افزایش یک یا چند ورودی موجب کاهش یک یا چند خروجی گردد؛ به‌طوریکه سایر ورودی‌ها و خروجی‌ها بدون تغییر باشند (و یا برعکس) اصطلاحاً تراکم رخ داده است. این مفهوم از این جهت در اقتصاد حائز اهمیت است که حذف تراکم باعث کاهش هزینه و افزایش خروجی می‌شود. از طرف دیگر، درفرآیند تولید و یا ارائه‌ی خدمات، بطور معمول، علاوه بر تو...
[ 5 ] - Balanced evaluation of suppliers performance by applying a hybrid DEMATEL-DEA approach in presence of undesirable factors
One of the most complicated decision making problems for managers in supply chain is the evaluation of supply chain performance which can be done in different ways. Though several studies have been developed on supply chain performance evaluation based on balanced scorecard (BSC), a few studies focused on relationships among four perspectives of BSC. This paper focuses on these relationships, e...
[ 6 ] - Estimating Capacity Utilization in Two-Stage Production Systems: A Data Envelopment Analysis Approach
The current study investigates performance in two-stage production systems through the measurement of capacity utilization (CU). In short-run, the degree of capacity utilization depends on the ability of decision making units to utilize fixed production factors. To develop this indicator in two-stage production processes, a modified SBM network DEA model is proposed. A numerical example is also...
[ 7 ] - Performance Measurement Techniques In the Presence of Undesirable Products
Performance measurement with undesirable outputs is an important subject in production processes. There are papers in which works can be divided into two groups. First group develops production models which undesirable outputs are considered as inputs and in second one undesirable outputs are modeled as outputs. We provide a comparison between these two groups and we axiomatically show that pro...
[ 8 ] - Performance analysis and ranking of provincial gas companies in the presence of undesirable products
Data envelopment analisys is a most frequently applied technique in the field of operations research that has attracted considerable attention among researchers. In this paper a performance evaluation model is proposed to analyse the relative efficiency of a set of decision making units when there are both, desirable and undesirable outputs. Managerial disposability assumption is used to handle...
[ 9 ] - Developing an Efficiency Based Target Setting Model for K-Stage Serial tructures
DEA as an effective approach to evaluate the relative efficiency of DMUs, recently applied in many production and operation systems. This paper proposed a new k-stage DEA based MOLP model for target setting in the serial network structures, considering undesirable outputs. Since the proposed model takes the size of DMUs into account, the new idea ensures the possibility of the results. The resu...
[ 10 ] - Envelopment analysis for global response to novel 2019 Coronavirus-SARS-COV-2 (COVID-19)
Communities are constantly seeking to manage the damages which are caused by crises. In this regard, health centers have become the most expensive unit of the health system as they provide quick and timely health care services to reduce the effects of unexpected accidents. So, their planning and preparation should be considered as an important part of strategic health policies. The purpose of t...
[ 11 ] - بهبود عملکرد واحدهای تصمیم‌گیرنده کارا با استفاده از روش تقاطع ابرصفحه‌های سازای مجموعه امکان تولید در تحلیل پوششی داده ها
تحلیل پوششی داده ها (DEA) یک تخمین‌گر است. این تخمین‌گر سعی می کند که یک ارتباط بین ورودی های متعدد و خروجی های متعدد و همچنین تکنولوژی تولید را تخمین بزند. DEA واحدهای تصمیم گیرنده (DMU) را به دو بخش واحدهای کارا و واحدهای ناکارا تقسیم بندی می‌کند. در این صورت واحدهای کارا مرجعی برای واحدهای ناکارا خواهد بود. در مدل‌های سنتیDEA بهبود کارایی تنها برای واحدهای ناکارا صورت می گیرد و واحدهای کارا ...
[ 12 ] - Estimation of cost efficiency for firms in different technologies using data envelopment analysis
Data envelopment analysis (DEA) is a method for evaluating the relative efficiency of a set of firms in a production process. Estimation of cost efficiency is one of the branches of performance evaluation. Cost efficiency evaluates the ability of producing current output with minimum available cost. Now let's assume that there are several groups of firms that operate separately and have differe...
[ 13 ] - Two-Stage Network DEA with Undesirable Outputs: An Application in the Air Transportation in the Spain
In this paper, two non-linear technologies are proposed based on weak disposability definitions: weak disposability with non-uniform abatement factors and new weak disposability. Both technologies are applied to Spanish airport systems and the existing technologies are modified. To remove the computational complexity of non-linear approaches, the linearization methods are proposed. Then, in ord...
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