Mohammad Ranjbar
Ferdowsi University of Mashhad
[ 1 ] - Scheduling a constellation of agile earth observation satellites with preemption
In this paper, we consider a scheduling problem for a set of agile Earth observation satellites for scanning different parts of the Earth’s surface. We assume that preemption is allowed to prevent repetitive images and develop four different preemption policies. Scheduling is done for the imaging time window and transmission time domain to the Earth stations as well. The value of each picture ...
[ 2 ] - Routing and Production Scheduling for a Mobile Factory
In last decades, mobile factories have been used due to their high production capability, carrying their equipment and covering rough and uneven routes. Nowadays, more companies use mobile factories with the aim of reducing the transportation and manufacturing costs. The mobile factory must travel between the suppliers, visit all of them in each time period and return to the initial location of...
[ 3 ] - Public transport fleet scheduling for minimizing total transfer waiting time
Public transportation has been one of the most important research fields in the two last decades. The purpose of this paper is to create a schedule for public transport fleets such as buses and metro trains with the goal of minimizing the total transfer waiting time. We extend previous research works in the field of transit schedule with considering headways of each route as decision variables....
[ 4 ] - A hybrid GRASP algorithm for minimizing total weighted resource tardiness penalty costs in scheduling of project networks
In this paper, we consider scheduling of project networks under minimization of total weighted resource tardiness penalty costs. In this problem, we assume constrained resources are renewable and limited to very costly machines and tools which are also used in other projects and are not accessible in all periods of time of a project. In other words, there is a dictated ready date as well as a d...
[ 5 ] - An Optimal NPV Project Scheduling with Fixed Work Content and Payment on Milestones
Project scheduling Net present value We consider a project scheduling problem with permitted tardiness and discrete time/resource trade-offs under maximum net present value objective. In this problem, a project consists of a set of sequential phases such that each phase contains one or more sub-projects including activities interrelated by finish-start-type precedence relations with a t...
[ 6 ] - Weapon scheduling in naval combat systems for maximization of defense capabilities
Air defense is a crucial area for all naval combat systems. In this study, we consider a warship equipped with an air-defense weapon that targets incoming threats using surface-to-air missiles. We define the weapon scheduling problem as the optimal scheduling of a set of surface-to-air missiles of a warship to a set of attacking air threats. The optimal scheduling of the weapon results in an in...
[ 7 ] - Maximizing service level in a β-robust job shop scheduling model
In the realm of scheduling problems, different sources of uncertainty such as probabilistic durations of jobs or stochastic breakdowns of machines can arise. Given this, one highly desirable characteristic of an intelligent schedule is to bring better punctuality with less efficiency-loss because a dominant factor in customer appreciation is punctuality. It is also one of the most intangible to...
[ 8 ] - محاسبات مهندسی نفت با پارامتر‌های فازی
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[ 9 ] - ارائه الگوریتم‌های ابتکاری و فراابتکاری برای مسأله زمانبندی یکپارچه تولید و توزیع در یک زنجیره تأمین
[ 11 ] - یکپارچه سازی برنامهریزی و زمانبندی تولید در صنایع فرآیندی چند محصولی با سیستم تولیدی پیوسته
One of the main elements of each supply chain is production. Production planning in multi-products process industries in which products are subjected to the complicated operational constraints is a very hard work because production of computed optimal volume should be compatible with operation scheduling constraints of production system. Thus, integration idea has been proposed for required d...
[ 12 ] - مدل‌سازی و حل مسئله تخصیص و زمانبندی آتش پایگاه‌های توزیع شده
با توجه به نقش و اهمیت نحوه تخصیص و زمانبندی تسلیحات موجود به تهدیدهای مهاجم در یک نبرد، استفاده از مدلهای ریاضی و بهینهسازی در اینگونه مسائل ضروری است. در این مقاله یک مدل برنامهریزی عدد صحیح خطی برای مسئله "تخصیص و زمانبندی سلاحهای آنها به اهداف" با هدف بیشینه کردن متوسط میزان تخریب اهداف و میزان محافظت از مناطق حساس و استفاده کارا از سلاحهای موجود و با در نظر گرفتن محدودیتهای عمل...
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