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المقاله
1 - A Bi-Objective Airport Gate Scheduling with Controllable Processing Times Using Harmony Search and NSGA-II AlgorithmsJournal of Optimization in Industrial Engineering , العدد 23 , السنة 11 , بهار 2018Optimizing gate scheduling at airports is an old, but also a broad problem. The main purpose of this problem is to find an assignment for the flights arriving at and departing from an airport, while satisfying a set of constraints.A closer look at the literature in this أکثرOptimizing gate scheduling at airports is an old, but also a broad problem. The main purpose of this problem is to find an assignment for the flights arriving at and departing from an airport, while satisfying a set of constraints.A closer look at the literature in this research line shows thatin almost all studies airport gate processing time has been considered as a fix parameter. In this research, however, we investigate a more realistic situation in which airport gate processing time is a controllable. It is also assumed that the possible compression/expansion processing time of a flight can be continuously controlled, i.e. it can be any number in a given interval.Doing sohas some positive effectswhich lead to increasing the total performance at airports’ terminals. Depending on the situation, different objectives become important.. Therefore, a model which simultaneously (1) minimize the total cost of tardiness, earliness, delay andthe compression as well as the expansion costs of job processing time, and (2) minimize passengers overcrowding on gate is presented. In this study, we first propose a mixed-integer programming model for the formulated problem. Due to complexity of problem, two multi-objective meta-heuristic algorithms, i.e. multi-objective harmony search algorithm (MOHSA) and non-dominated sorting genetic algorithm II (NSGA-II) are applied in order to generate Pareto solutions. For calibrating the parameter of the algorithms, Taguchi method is used and three optimal levels of the algorithm’s performance are selected. The algorithms are tested with real-life data from Mehrabad International Airport for nine medium size test problems. The experimental results show that NSGA-II has better convergence near the true Pareto-optimal front as compared to MOHSA; however, MOHSA finds a better spread in the entire Pareto-optimal region.Finally, it is possible to apply some practical constraints into the model and also test them with even large real-life problems instances. تفاصيل المقالة -
المقاله
2 - Development of Linguistic Rules Diagnosis of Failure in Centrifugal Pump for Use in Expert SystemJournal of Modern Processes in Manufacturing and Production , العدد 2 , السنة 4 , بهار 2015Operational failures in centrifuge pumps could be hydraulic or mechanical. However, most of these mechanical and hydraulic failures are connected cause of their operational nature and finding the right cause is due to considering numerous mechanical and hydraulic signs أکثرOperational failures in centrifuge pumps could be hydraulic or mechanical. However, most of these mechanical and hydraulic failures are connected cause of their operational nature and finding the right cause is due to considering numerous mechanical and hydraulic signs and parameters in pumps. On the other hand, due to non-linear and fluctuant behavior of pumps in the matter of time and not precise and clear data from a complicated system such as a petrochemical unit installations, investigating the failure possibilities in pumps by exact mathematical equations is so hard. However, the expert staff in maintenance could find the cause of failure by getting benefit of imprecise and verbal rules of "if-then" and the awareness of the non-clearance in system. However, it should be noted that this process takes time and also it is so dependent on the knowledge of expert staff, also human error can cause wrong decision-making and it declines reliability in the system. Therefore, this study is looking forward to find a collection of imprecise and verbal rules by using the reference book of "OREDA", also the pump handbook and the knowledge of expert staff in maintenance. With the acquisition of knowledge and Extraction of linguistic rules from taking effect between critical failure modes of mechanical and hydraulic parameters of process pump is created the relationship between these parameters and verbal rules, also by using a neural network of MLP category for the cases to train the neural network. Obtained results in companion with the average on accuracy, precision and recall parameters would be the approval of our method. تفاصيل المقالة -
المقاله
3 - تحلیل دینامیکی عملکرد نظام بانکی ایران در شرایط عدم قطعیتپیشرفت های مالی و سرمایه گذاری , العدد 4 , السنة 3 , پاییز 1401هدف: هدف این پژوهش ارائه چارچوبی برای پشتیبانی از تصمیم مدیران و سیاستگذاران نظام بانکی ایران است.روششناسی پژوهش: ابتدا با بررسی روند اقتصادی کشور با مشارکت خبرگان، عدمقطعیتهای مؤثر بر عملکرد نظام بانکی بر مبنای شاخصهای بینالمللی کملز شناسایی و سپس شبکه عدمقطعیت أکثرهدف: هدف این پژوهش ارائه چارچوبی برای پشتیبانی از تصمیم مدیران و سیاستگذاران نظام بانکی ایران است.روششناسی پژوهش: ابتدا با بررسی روند اقتصادی کشور با مشارکت خبرگان، عدمقطعیتهای مؤثر بر عملکرد نظام بانکی بر مبنای شاخصهای بینالمللی کملز شناسایی و سپس شبکه عدمقطعیتهای نظام بانکی ایران برای تعیین عدمقطعیتهای بحرانی با استفاده از رویکرد تحلیل شبکه اجتماعی مورد ارزیابی قرار گرفت. در مرحله بعد به طراحی مدل پویای عملکرد نظام بانکی در شرایط عدم قطعیت با استفاده از پویایی سیستم بر اساس دادههای بانک صادرات ایران پرداخته شد و مدل در افق بیستساله شبیهسازی گردید.یافتهها: مطابق با یافتههای پژوهش چهار استراتژی مدیریت دارایی و مصارف بانک، جذب منابع مالی و سودآورسازی، توانمندسازی مدیریت بانک و توسعه زیرساختهای بانکداری و نیز منتخب ترکیبی شناسایی و شبیهسازی شدند. در نتیجه شبیهسازی، استراتژی منتخب ترکیبی سیاستها، بهترین عملکرد نظام بانکی را نشان داد که شامل 1-افزایش سرمایهگذاری در زیرساختهای بانکی 2-ایجاد سازوکارهای ویژه برای وصول مطالبات 3-مدیریت هزینههای بانک از طریق چابکسازی فرایندها و توانمندسازی منابع انسانی و نیز نظارت بر هزینههای بانک 4-افزایش کارآمدی فرایند اعتبارسنجی مناسب مشتریان 5-افزایش اعتماد و امنیت سپردهگذاران با ارائه گزارشهای شفافیت مالی و ارتباط مؤثر با ذینفعان کلیدی است.اصالت / ارزش افزوده علمی: اصلاح ساختار نظام بانکی، تدوین مقررات و سیاستهای پولی و مالی کارآمد و نظارت مؤثر بر عملکرد بانکهای کشور میتواند عدمقطعیتها را با شدت کمتری به بانکها منتقل سازد و تنها در این شرایط بانکها میتوانند با برنامهریزی بلندمدت، عملکرد خود را توسعه دهند. تفاصيل المقالة