ایرج مهدوی
استاد دانشکدة مهندسی صنایع دانشگاه علوم و فنون مازندران
[ 1 ] - یک الگوریتم ژنتیک کارا برای مسأله مسیریابی وسایل نقلیه با در نظر گرفتن مهارت تیم های کاری
در این پژوهش، مدل ریاضی جدیدی برای مسئلة ترکیبی نیروی انسانی- مسیریابی وسایل نقلیه، با درنظرگرفتن تیم‌هایی با سطوح مختلف مهارت به‌عنوان عوامل خدمتدهنده، ارائه شده است. وجود تیم‌هایی با مهارت‌های متفاوت، موجب انجام کارهای مختلف مشتریان در زمان و هزینههای متفاوت و افزایش انعطاف‌پذیری برنامه‌ریزی میشود. جابهجایی این تیم‌ها با استفاده از گروهی از وسایل نقلیه با سرعت و هزینههای متفاوت انجام می...
[ 2 ] - ALGORITHMS FOR BIOBJECTIVE SHORTEST PATH PROBLEMS IN FUZZY NETWORKS
We consider biobjective shortest path problems in networks with fuzzy arc lengths. Considering the available studies for single objective shortest path problems in fuzzy networks, using a distance function for comparison of fuzzy numbers, we propose three approaches for solving the biobjective prob- lems. The rst and second approaches are extensions of the labeling method to solve the sing...
[ 3 ] - An Integrated Decision Making Model for Manufacturing Cell Formation and Supplier Selection
Optimization of the complete manufacturing and supply process has become a critical ingredient for gaining a competitive advantage. This article provides a unified mathematical framework for modeling manufacturing cell configuration and raw material supplier selection in a two-level supply chain network. The commonly used manufacturing design parameters along with supplier selection and a subco...
[ 4 ] - Particle swarm optimization for a bi-objective web-based convergent product networks
Here, a collection of base functions and sub-functions configure the nodes of a web-based (digital)network representing functionalities. Each arc in the network is to be assigned as the link between two nodes. The aim is to find an optimal tree of functionalities in the network adding value to the product in the web environment. First, a purification process is performed in the product network ...
[ 5 ] - An integrated model of cellular manufacturing and supplier selection considering product quality
Today’s business environment has forced manufacturers and plants to produce high-quality products at low cost and the shortest possible delivery time. To cope with this challenge, manufacturing organizations need to optimize the manufacturing and other functions that are in logical association with each other. Therefore, manufacturing system design and supplier selection process are linked toge...
[ 6 ] - Cell forming and cell balancing of virtual cellular manufacturing systems with alternative processing routes using genetic algorithm
Cellular manufacturing (CM) is one of the most important subfields in the design of manufacturing systems and as a recently emerged field of study and practice, virtual cellular manufacturing (VCM) inherits the importance from CM. One type of VCM problems is VCM with alternative processing routes from which the route for processing each part should be selected. In this research, a bi-objective ...
[ 7 ] - Designing an integrated production/distribution and inventory planning model of fixed-life perishable products
This paper aims to investigate the integrated production/distribution and inventory planning for perishable products with fixed life time in the constant condition of storage throughout a two-echelon supply chain by integrating producers and distributors. This problem arises from real environment in which multi-plant with multi-function lines produce multi-perishable products with fixed life ti...
[ 8 ] - A mathematical model for designing optimal urban gas networks, an ant colony algorithm and a case study
Considering the high costs of the implementation and maintenance of gas distribution networks in urban areas, optimal design of such networks is vital. Today, urban gas networks are implemented within a tree structure. These networks receive gas from City Gate Stations (CGS) and deliver it to the consumers. This study presents a comprehensive model based on Mixed Integer Nonlinear Programming (...
[ 9 ] - A bi-level mathematical programming for cell formation problem considering workers’ interest
Nowadays, the necessity of manufacturers’ response to their customers’ needs and their fields of activities have extended widely. The cellular manufacturing systems have adopted reduced costs from mass-production systems and high flexibility from job-shop manufacturing systems, and therefore, they are very popular in modern manufacturing environments. Manufacturing systems, in addit...
[ 10 ] - A fuzzy multi-objective model for logistic planning in disaster relief operations
Disasters can cause many casualties and considerable destruction mainly because of ineffective preventive measures, incomplete preparedness, and weak relief logistics systems. After catastrophic events happen, quick and effective response is of great importance, so as to having an efficient logistic plan for distributing needed relief commodities efficiently and fairly among affected people. In...
[ 11 ] - Manufacturing Cell Configuration Considering Worker Interest Concept Applying a Bi-Objective Programming Approach
Generally, human resources play an important role in manufacturing systems as they can affect the work environment. One of the most important factors affecting the human resources is being an interactional interest among the workers in the workshops. If the workers in a manufacturing cell have the highest surface of the interactional interest level, it causes a significant raise in coordination...
[ 12 ] - A Multi-Level Capacity Approach to the Hub and Spoke Network
The existing works considering the flow-based discount factor in the hub and spoke problems, assume that increasing the amount of flow passing through each edge of network continuously decreases the unit flow transportation cost. Although a higher volume of flow allows for using wider links and consequently cheaper transportation, but the unit of flow enjoys more discounts, quite like replacing...
[ 15 ] - تحلیل پتنت بااستفاده از داده کاوی برای شناسایی و تعیین ارتباطات میان فناوری ها
Analyzing technologies relationships can provide insight into technological strategies and maximizing the profits. Patents are integral parts of intellectual property rights including significant information about developed technologies. Due to the increasing amount of patents, data mining method is proposed for patent analysis. Thus, weighted association rules have been used for patent analysi...
[ 16 ] - حل مسأله مسیریابی وسایل نقلیه با در نظر گرفتن سفرهای چندگانه و پنجره های زمانی در مدیریت پسماند شهری با استفاده از الگوریتم بهینه سازی گرگ خاکستری
یکی از مهم‌ترین مسائل نگران‌کننده جوامع بشری در سال‌های اخیر مدیریت پسماند شهری بوده که از جمله ملزومات اصلی هر شهر می‌باشد و بی‌توجهی نسبت به آن می‌تواند برای هر شهر و حتی ساکنان روستاهای اطراف آن مشکل‌آفرین باشد. مناطق شهری بیشترین مقدار زباله را تولید کرده و در نتیجه به یک سیستم کارا جهت جمع‌آوری زباله و دفع آن نیازمند است که تعیین و تثبیت آن بسیار مشکل و هزینه‌بر است. در این راستا، این مقال...
[ 17 ] - حل مسأله مسیریابی وسایل نقلیه سبز با در نظر گرفتن وضعیت ترافیک شهری و کاهش سوخت مصرفی در توزیع کالاهای فاسدشدنی
امروزه حمل و نقل و لجستیک به دلیل اثراتی که بر متغیرهای اصلی اقتصاد کشور مانند تولید، اشتغال، قیمت و شاخص هزینه زندگی بر جای می‌گذارد، به عنوان پیشران در توسعه اقتصادی در کشورها محسوب میشود. آمارها نشانگر آن است که مصرف سوخت بخش قابل توجهی از هزینههای حمل و نقل را در بر می‌گیرد. از سویی دیگر، وضعیت ترافیک نیز یکی از عوامل مؤثر در تعیین زمان سفر وسایل نقلیه بین نقاط تقاضا در یک زن...
[ 18 ] - A Novel Interactive Possibilistic Mixed Integer Nonlinear Model for Cellular Manufacturing Problem under Uncertainty
Elaborating an appropriate cellular manufacturing system (CMS) could solve many structural and operational issues. Thereby, considering some significant factors as worker skill, machine hardness, and product quality levels could assist the companies in current competitive environment. This paper proposes a novel interactive possibilistic mixed integer nonlinear approach to minimize the total co...
[ 19 ] - A Nonlinear Model for a Capacitated Location-allocation Problem with Bernoulli Demand using Sub-sources
This study presents a capacitated multi-facility location-allocation problem with stochastic demands based on a well-known distribution function. In this discrete environment, besides the capacitated facilities, we can employee the capacitated sub-source of each facility for satisfying demands of customers. The objective function is to find the optimal locations of facilities among a finite num...
[ 20 ] - OPTIMIZATION OF TREE-STRUCTURED GAS DISTRIBUTION NETWORK USING ANT COLONY OPTIMIZATION: A CASE STUDY
An Ant Colony Optimization (ACO) algorithm is proposed for optimal tree-structured natural gas distribution network. Design of pipelines, facilities, and equipment systems are necessary tasks to configure an optimal natural gas network. A mixed integer programming model is formulated to minimize the total cost in the network. The aim is to optimize pipe diameter sizes so that the location-alloc...
[ 21 ] - An Interactive Allocation for Depot-Customer-Depot in a Multi Aspect Supply Chain Network
Supply chain excellence has a real huge impact on business strategy. Building supply chains (SCs) as flexible system represents one of the most exciting opportunities to create value. This requires integrated decision making amongst autonomous chain partners with effective decision knowledge sharing among them. The key to success lies in knowing which decision has more impact on the supply chai...
[ 23 ] - The Preemptive Just-in-time Scheduling Problem in a Flow Shop Scheduling System
Flow shop scheduling problem has a wide application in the manufacturing and has attracted much attention in academic fields. From other point, on time delivery of products and services is a major necessity of companies’ todays; early and tardy delivery times will result additional cost such as holding or penalty costs. In this paper, just-in-time (JIT) flow shop scheduling problem with preemp...
[ 24 ] - ارائه روش حل دقیق و فراابتکاری برای مسئله کمینه سازی زمان تکمیل پروژه با در نظر گرفتن محدودیت بودجه
یکی از چالش‌‌های مهم در مدیریت پروژه های عمرانی، مدیریت زمان و هزینه است. امروزه دیدگاه های سنتی به تنهایی قادر به پاسخگویی نیازهای این عرصه نیست. بنابراین استفاده از رویکردهای نوین مدیریتی می‌تواند تا حد زیادی راه‌گشا باشد. زمان و هزینه پروژه جزء اهداف مهم هر پروژه می‌باشند. موازنه هزینه و زمان از جمله مباحث مهم در برنامه ریزی و کنترل پروژه ها است و هدف از حل این مساله در واقع تحلیل رفتار متق...
[ 25 ] - Balancing public bicycle sharing system by defining response rates for destinations
Public Bicycle Sharing System (PBSS) is used as a way to reduce traffic and pollution in cities. Its performance is related to availability of bicycles for picking up and free docks to return them. Existence of different demand types leads to the emergence of imbalanced stations. Here, we try to balance inventory of stations via defining maximal response rates for each type of rental request. I...
[ 26 ] - Three-stage mining metals supply chain coordination and air pollutant emission reduction with revenue sharing contract
One of the main concerns of all industries such as mine industries is to increase their profit and keep their customers through improving quality level of their products; but increasing the quality of products usually releases air pollutants. Nowadays the management of air pollutant emissions with harmful environmental and health effects is one of the most pressing problems. In this paper, auth...
[ 27 ] - Simulated annealing and artificial immune system algorithms for cell formation with part family clustering
Cell formation problem (CFP) is one of the main problems in cellular manufacturing systems. Minimizing exceptional elements and voids is one of the common objectives in the CFP. The purpose of the present study is to propose a new model for cellular manufacturing systems to group parts and machines in dedicated cells using a part-machine incidence matrix to minimize the voids. After identifying...
[ 28 ] - A Public Bicycle Sharing System Considering Renting and Middle Stations
Recently, public bicycle sharing system (PBSS) has become one of the most favorite urban transportation systems that can help governments to decrease environmental problems such as pollution and traffic. This paper studies a sharing system that includes two types of stations. The first category contains stations that users can rent or return back bicycles and each bicycle can be rented by any n...
[ 29 ] - A Bi-objective Model for Cellular Manufacturing System Considering Worker Skills, Part Priorities,and Equipment Levels
Here, a new mathematical model for cellular manufacturing systems considering three important features of part priority, levels of machine’s technology, and the operator’s skill is developed. Simultaneous consideration of these features provides a more realistic analysis of the problems in cellular manufacturing systems. A model with multiple design features including cell formation, human reso...
[ 30 ] - A Multi-objective Optimization Model for Dynamic Virtual Cellular Manufacturing Systems
Companies and firms, nowadays, due to mounting competition and product diversity, seek to apply virtual cellular manufacturing systems to reduce production costs and improve quality of the products. In addition, as a result of rapid advancement of technology and the reduction of product life cycle, production systems have turned towards dynamic production environments. Dynamic cellular manufact...
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