محمدمهدی نصیری
دانشگاه تهران
[ 1 ] - مقایسه کارایی مدل‌های برنامه‌ریزی عدد صحیح برای حل مساله زمان‌بندی کارگاه مرحله‌ای
توسعه و تعمیم مدل‌های کلاسیک برای نزدیک شدن به شرایط دنیای واقعی همواره مورد توجه محققان قرار دارد. به همین جهت، تا کنون تلاش‌های زیادی برای توسعه مساله کار کارگاهی صورت گرفته است. مساله کارگاه مرحله‌ای به عنوان تعمیمی از کارگاه مخلوط و حالت خاصی از کارگاه عمومی تعریف می‌شود. در یک کارگاه مرحله‌ای، هر کار دارای چندین مرحله و هر مرحله شامل یک یا چند عمل است. یک مرحله، زیر مجموعه‌ای از عمل‌های یک...
[ 2 ] - یک مدل تلفیقی جهت انتخاب تأمین کنندگان و تخصیص سفارش در زنجیرة تأمین
تأمینکنندگان نقشی بارز در عملکرد مناسب یک زنجیرة تأمین دارند و انتخاب مناسب آنها از اهمیتی ویژه برخوردار است. در این پژوهش، مدلی تلفیقی از روش تصمیمگیری چندمعیاره و برنامه‌ریزی ریاضی برای انتخاب تأمینکنندگان و تخصیص سفارش در زنجیرة تأمین ارائه می‌شود. ساختار ارائه‌شده متشکل از دو زیرمدل کیفی و کمّی است. زیرمدل کیفی با بهره‌گیری از فن اولویتبندی بر اساس شباهت به راهحل ایدهآل (تاپسیس) ...
[ 3 ] - Improvement of operating room performance using a multi-objective mathematical model and data envelopment analysis: A case study
Surgical theater is one of the most expensive hospital sources that a high percentage of hospital admissions are related to it. Therefore, efficient planning and scheduling of the operating rooms (ORs) is necessary to improve the efficiency of any healthcare system. Therefore, in this paper, the weekly OR planning and scheduling problem is addressed to minimize the waiting time of elective pati...
[ 4 ] - Cuckoo Optimization Algorithm for a Reliable Location-Allocation of Hubs among the Clients
Hubs are critical elements of transportation networks. Location of hubs and allocation of demands to them are of high importance in the network design. The most important purpose of these models is to minimize the cost, but path reliability is also another important factor which can influence the location of hubs. In this paper, we propose a P-center hub location model with full interconnection...
[ 5 ] - A mathematical model for hazmat and freight transportation in railway networks
In this paper, we develop a freight transportation model for railway network considering hazmat transportation issue. In the transportation system considered, different customers can request for carrying hazmat and non- hazmat boxes. It is assumed that the sequence of the trains in the network is known. The objective is assigning the non-hazmat boxes and hazmat boxes to wagons of the trains so ...
[ 6 ] - Minimizing the energy consumption and the total weighted tardiness for the flexible flowshop using NSGA-II and NRGA
This paper presents a bi-objective MIP model for the flexible flow shop scheduling problem (FFSP) in which the total weighted tardiness and the energy consumption are minimized simultaneously. In addition to considering unrelated machines at each stage, the set-up times are supposed to be sequence- and machine-dependent, and it is assumed that jobs have different release tim...
[ 7 ] - Scheduling Post-Distribution Cross-Dock under Demand Uncertainty
The system of distribution of goods and services, along with other economic developments around the world, is rapidly evolving. In the world of distribution of goods, the main focus is on making distribution operations more effective. Due to the fact that the cross-dock has the advantage of removing intermediaries and reducing the space required for the warehouse, it is worth considering. Among...
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