محمدصابر فلاح نژاد

[ 1 ] - تخمین تلاش کلی نرم‌افزار و تلاش صرف‎شده در هر مرحلۀ تولید با استفاده از شبکۀ بیزی بهینه

دقت در تخمین تلاش لازم برای تولید نرم­افزار، موجب شده است که تخمین تلاش هنوز به‎عنوان موضوع چالش‎انگیزی مطرح باشد. علاوه‎بر تخمین تلاش کلی، تعیین تلاش صرف‎شده در هر مرحله از تولید نیز به‎دلیل برنامه­ریزی منابع اهمیت دارد؛ زیرا تخصیص نادرست منابع می­تواند به شکست پروژه منجر شود. در این مقاله، یک شبکۀ بیزی برای تخمین تلاش برپایۀ مؤلفه­های مؤثر و فرایند تولید ارائه شده است. در این مدل بین مراحل تو...

[ 2 ] - Integration of the Decisions Associated with Maintenance Management and Process Control for a Series Production System

This paper studies a series production system through the integration of the decisions associated with Maintenance Management (MM) and Statistical Process Control (SPC). Hence, the primary question of the paper can be stated as follows: In a series production system, how can the decisions of MM and SPC be coordinated? To this end, an integrated mathematical model of MM and SPC is developed. Usi...

[ 3 ] - Performance of CCC-r control chart with variable sampling intervals

The CCC-r chart is developed based on cumulative count of a conforming (CCC) control chart that considers the cumulative number of items inspected until observing r nonconforming ones. Typically, the samples obtained from the process are analyzed through 100% inspection to exploit the CCC-r chart. However, considering the inspection cost and time would limit its implementation. In this paper, w...

[ 4 ] - Effects of inspection errors on economically design of CCC-r control chart

CCC-r chart extended approach of CCC charts, is a technique applied when nonconforming items are rarely observed. However, it is usually assumed that the inspection process is perfect in the implementation control charts imperfect inspections may have a significant impact on the performance of the control chart and setting the control limits. This paper first investigates the ...

[ 5 ] - Cost Analysis of Acceptance Sampling Models Using Dynamic Programming and Bayesian Inference Considering Inspection Errors

Acceptance Sampling models have been widely applied in companies for the inspection and testing the raw material as well as the final products. A number of lots of the items are produced in a day in the industries so it may be impossible to inspect/test each item in a lot. The acceptance sampling models only provide the guarantee for the producer and consumer that the items in the lots are acco...

[ 6 ] - Design of Economic Optimal Double Sampling Design with Zero Acceptance Numbers

  In zero acceptance number sampling plans, the sample items of an incoming lot are inspected one by one. The proposed method in this research follows these rules: if the number of nonconforming items in the first sample is equal to zero, the lot is accepted but if the number of nonconforming items is equal to one, then second sample is taken and the policy of zero acceptance number would be ap...

[ 7 ] - Economic-Statistical Design of a Control Chart for High Yield Processes When the Inspection is Imperfect

CCC-r control chart is a monitoring technique for high yield processes. It is based on the analysis of the number of inspected items until observing a specific number of defective items.  One of the assumptions in implementing CCC-r chart that has a significant effect on the design of the control chart is that the inspection is perfect. However, in reality, due to the multiple reasons, the...

[ 8 ] - Modeling and Numerical Analysis of Revenue Sharing Contract Based on the Stackelberge Game Theory

Considered supply chain in this article consists of one vendor and multiple retailers where the vendor applies vendor managed inventory. Considering vendor as a leader and retailers as followers, Stackelberg game theory is applied for modeling and analyzing this system. A general mixed integer nonlinear model is developed which can optimizes the performance of the system under revenue sharing c...

[ 9 ] - Location-Routing Problem with Fuzzy Time Windows and Traffic Time

The location-routing problem is a relatively new branch of logistics system. Its objective is to determine a suitable location for constructing distribution warehouses and proper transportation routing from warehouse to the customer. In this study, the location-routing problem is investigated with considering fuzzy servicing time window for each customer. Another important issue in this regard ...

[ 10 ] - A Markov Model to Determine Optimal Equipment Adjustment in Multi-stage Production Systems Considering Variable Cost

Our aim is to maximize expected profit per item of a multi-stage production system by determining best adjustment points of the equipments used based on technical product specifications defined by designer. In this system, the quality characteristics of items produced should be within lower and higher tolerance limits. When a quality characteristic of an item either falls beneath the lower li...

[ 11 ] - Determination of Effective Travel Variables on Air Transport Demand with Using Structural Equation

Air transport system has always been involved in all aspects of life because of its high potential in transporting passengers and goods. In this research we surveys the effects of travel variables on demand of domestic air transport, and for gathering required information from passengers, a questionnaire was designed including 20 effective parameters on air transport demand with questions These...

[ 12 ] - Performance of cumulative count of conforming chart with variable sampling intervals in the presence of inspection errors

In high quality industrial processes, the control chart is design based on cumulative count of conforming (CCC) items is very useful. In this paper, the performance of CCC-r chart with variable sampling intervals (CCC-rVSI chart) in the presence ofinspectionerrors isinvestigated. The efficiency of CCC-rVSI chart is compared with CCC-r chart with fixed sampling interval (CC...

[ 13 ] - A multi-objective optimization model for process targeting

Customers and consumers are the necessities for the survival of industries and organizations. Trying to improve the process in order to increase consumer satisfaction is the most important aim. The survival of an organization depends on its ability to continue the activities in compliance with the demands of customers to meet their legitimate needs. An organization is successful when it exactly...

[ 14 ] - Economical-Statistical design of one- sided CCC-r control chart based on analytical hierarchy process

The cumulative count of a conforming (CCC) control chart is used for high quality processes.The CCC − r chart is an improvement of the CCC chart that is based on the cumulative number of items inspected until observing r non-conforming ones. This paper aims to propose a new approach for manufacturer’s decision making according to the criteria among the available options. The o...

[ 15 ] - Reliable location-allocation model for congested systems under disruptions using accelerated Benders decomposition

This paper aims to propose a reliable location-allocation model where facilities are subject to the risk of disruptions. Since service facilities are expected to satisfy random and heavy demands, we model the congested situations in the system within a queuing framework which handles two sources of uncertainty associated with demand and service. To insure the service quality, a minimum limit re...

[ 16 ] - A New Optimization Model for Designing Acceptance Sampling Plan Based on Run Length of Conforming Items

The purpose of this article is to present an optimization model for designing an acceptance sampling plan based on cumulative sum of run length of conforming items. The objective is to minimize the total loss including both the producer and consumer losses. The concept of minimum angle method is applied to consider producer and consumer risks in the optimization model. Also the average number o...

[ 17 ] - یک رویکرد برنامه‌ریزی پویای احتمالی در برنامه‌ریزی تولید صنایع فرآیندی

[ 18 ] - تخصیص تعداد بهینه‌ی نیروی انسانی به خط تولید در شرایط عدم قطعیت با استفاده از تئوری صف و منطق فازی

[ 19 ] - Designing an Economic Repetitive Sampling Plan in the Presence of Two Markets

In this paper, we develop an optimization model for the economic design of repetitive sampling plan in the presence of two markets. The process under consideration produces a product with a normally distributed quality characteristic with unknown mean and known variance. The quality characteristic has a lower specification limit. The quality of the product is controlled via lot-by-lot acceptanc...

[ 20 ] - Determining the Sample size for Estimation of the CCC-R Control Chart Parameters Based on Estimation Costs

In today's highly competitive industrial environment due to fast technology development, quality practitioners will to detect out-of-control situations and take actions whenever is necessary as soon as possible. Accordingly, new statistical procedures have been enhanced incessantly both to handle high yield processes along with looking for methods of minimizing all quality cost. CCC-r chart, th...

[ 21 ] - Design of a Reliable Facility Location Model for Health Service Networks

This paper proposes a novel facility location model for health service network design by considering different key elements including the reliability aspects, service capacity, congestion, service quality, surrounding public infrastructures, geographical accessibility and several types of cost such as investment, transportation and operational costs. We formulate the problem as a robust scenari...

[ 22 ] - The Reliable Hierarchical Location-allocation Model under Heterogeneous Probabilistic Disruptions

This paper presents a novel reliable hierarchical location-allocation model where facilities are subject to the risk of disruptions. Based on the relationship between various levels of system, a multi-level multi-flow hierarchy is considered. The heterogeneous probabilistic disruptions are investigated in which the constructed facilities have different site-dependent and independent failure rat...

[ 23 ] - Designing different Sampling Plans Based on Process Capability Index

Acceptance sampling plan is a method to make decision on either accepting or rejecting a specific lot or more generally to inspect the quality of products that can be used by different methods. Along with this, one suitable measure to improve manufacturing processes is to analyze process capability indices. These indices have many applications in production environments. In this paper, a repeti...

[ 24 ] - Determining an Economically Optimal (N,C) Design via Using Loss Functions

In this paper, we introduce a new sampling plan based on the defective proportion of batch. The proposed sampling plan is based on the distribution function of the proportion defective. A continuous loss function is used to quantify deviations between the proportion defective and its acceptance quality level (AQL).  For practical purpose, a sensitivity analysis is carried out on the different v...

[ 25 ] - A New Acceptance Sampling Design Using Bayesian Modeling and Backwards Induction

In acceptance sampling plans, the decisions on either accepting or rejecting a specific batch is still a challenging problem. In order to provide a desired level of protection for customers as well as manufacturers, in this paper, a new acceptance sampling design is proposed to accept or reject a batch based on Bayesian modeling to update the distribution function of the percentage of nonconfor...

[ 26 ] - Optimal Process Adjustment under Inspection Errors Considering the Cycle Time of Production

Process adjustment, also known as process targeting, is one of the classical problems in the field of quality control and production economics. In the process adjustment problem, it is assumed that process parameters are variables and the aim is to determine these parameters such that certain economic criteria are optimally satisfied. The aim of this paper is to determine the optimal process ad...

[ 27 ] - Robust Economic-Statistical Design of Acceptance Control Chart

Acceptance control charts (ACC), as an effective tool for monitoring highly capable processes, establish control limits based on specification limits when the fluctuation of the process mean is permitted or inevitable. For designing these charts by minimizing economic costs subject to statistical constraints, an economic-statistical model is developed in this paper. However, the parameters of s...

[ 28 ] - رویکرد یکپارچه برای انتخاب تأمین‌کننده‌ی پایدار بر اساس روش استدلال شواهدی و روش بهترین و بدترین

در این پژوهش یک مسئله‌ی انتخاب تأمین‌کننده‌ی پایدار در نظر گرفته شده است و اولین بار روشی برای ارزیابی تأمین‌کنندگان با رویکرد استدلال شواهدی ارائه شده است. از مزایای این روش نسبت به روش‌های موجود ارزیابی تأمین‌کنندگان این است که این روش، عدم قطعیت‌های ارزیابی شخصی را در نظر می‌گیرد. همچنین هنگام مقایسه‌ی تأمین‌کنندگان در شرایطی که در بعضی از زیرمعیارهای ارزیابی فقدان اطلاعات وجود داشته باشد، ...