نتایج جستجو برای: robust
تعداد نتایج: 205617 فیلتر نتایج به سال:
شبکه های عصبی ابزارهای نسبتاً جدیدی هستند که در فرآیندهای مدل سازی رشد در سیستم های پرورش حیوانات مورد استفاده قرار می گیرند. در این پژوهش شبکه عصبی gmdh robust ، به عنوان یک مدل خود سازمانده، جهت پیش-بینی تولید وزنی تخم مرغ قابل جوجه کشی در مراحل مختلف تولیدی (25 تا 29 هفتگی، 30 تا 35 هفتگی، 36 تا 60 هفتگی و 25 تا 60 هفتگی) در مرغان مادر مورد استفاده قرار گرفت. متغیرهای ورودی موثر در این پژوهش ...
In this paper, mean absolute deviation model for optimal portfolio selection problem is studied. Due to the uncertainty in the observed returns from financial markets, an improved robust formulation based on Bertsimas and Sim approach is presented. Then we study the robust model of the problem under correlated uncertainty set and give its equivalent model. Finally, the performance of the imp...
the robust coloring problem (rcp) is a generalization of the well-known graph coloring problem where we seek for a solution that remains valid when extra edges are added. the rcp is used in scheduling of events with possible last-minute changes and study frequency assignments of the electromagnetic spectrum. this problem has been proved as np-hard and in instances larger than 30 vertices, meta-...
in this paper, a robust model presented is developed for hub covering flow problem in which hubs have capacity. this problem has two objective functions converting to a single-objective problem by using weighting method. firstly, the problem will be formulated in a certain case. then, by considering the demand as a non-random variable, it will be modeled by robust optimization. finally, by usin...
Robust supplier selection problem, in a scenario-based approach has been proposed, when the demand and exchange rates are subject to uncertainties. First, a deterministic multi-objective mixed integer linear programming is developed; then, the robust counterpart of the proposed mixed integer linear programming is presented using the recent extension in robust optimization theory. We discuss dec...
this paper presents some analyses about the robust practical stability of a class of nonlinear affine systems in the presence of non-vanishing perturbations based on the passivity concept. the given analyses confirm the robust passivity property of the perturbed nonlinear systems in a certain region. moreover, robust control laws are designed to guarantee the practical stability of the perturbe...
impact of capacity of mobile units on blood supply chain performance: results from a robust analysis
background and objectives: a sudden jump in blood demand during natural disasters may have strong negative impact on the performance of blood supply chain. appropriate response to the emergency situations, requires predictive approach to determining the optimal allocation of blood supply chain resources for various disaster scenarios. the present study, thus, presents an optimization model aime...
the networked control system in modern control widely uses to decrease the implementation cost and increasing the performance. ncs in addition to its advantages is inevitable. nevertheless they suffer of some limitations and deficiencies. packet loss is one of the main limitations which affect the control system in different conditions and finally may lead to system instability. for this reason...
state estimation is the foundation of any control and decision making in power networks. the first requirement for a secure network is a precise and safe state estimator in order to make decisions based on accurate knowledge of the network status. this paper introduces a new estimator which is able to detect bad data with few calculations without need for repetitions and estimation residual cal...
به منظور افزایش پایداری دینامیکی شبکه قدرت ، نیاز به طراحی pss می باشد . با توجه به دینامیک متغیر با زمان و نامعینی های موجود در دینامیک شبکه قدرت ، پایدارساز طراحی شده بایستی در تمامی نقاط کار سیستم پایداری و کارایی سیستم را حفظ کند. روشهای کلاسیک طراحی pss برای یک نقطه کار طراحی شده و با تغییر نقطه کار و با وجود اغتشاشات و نامعینی ها کارایی سیستم ها به شدت کاهش می یابد. در این پروژه ب...
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