نتایج جستجو برای: convergence factor

تعداد نتایج: 953138  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه بیرجند - دانشکده کشاورزی 1392

در سال های اخیر، کاربرد مدل های هیدرولوژیکی توزیعی بر پایه فیزیکی افزایش یافته است. با این حال بسیاری از سوالات در خصوص واسنجی و صحت سنجی صحیح مدل های توزیعی و ارزیابی عدم قطعیت پارامترهای تخمینی، هنوز هم ناشناخته است. به خصوص برای مدل های پیچیده، تخمین پارامترها به طور صحیح، کاهش فضای پارامتری و استفاده از الگوریتم های موثر و کارآمد به منظور کاهش عدم قطعیت و تسهیل فرآیند واسنجی امری ضروریست. ه...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه زنجان - دانشکده کشاورزی زنجان 1393

در این تحقیق به بررسی پارامترهای بیلان آب حوضه رودخانه آق چای در شمال استان آذربایجان غربی، با مساحت 1440.89 کیلومتر مربع پرداخته شده است. مدل سازی بارش-رواناب با گام زمانی روزانه و با استفاده از مدل نیمه توزیعی swat و بهینه سازی پارامترهای حوضه، بررسی عدم قطعیت مدل و پارامترها با برنامه swat-cup انجام گرفته است. کاربرد الگوریتم sufi-2 در بررسی عدم قطعیت نشان داد مقدار ضریب ناش برای دوره واسنج...

Convergence is an issue being widely concerned about. Thus, in this paper, we mainly put forward two types of concepts of convergence in mean and convergence in distribution for the sequence of uncertain random variables. Then some of theorems are proved to show the relations among the three convergence concepts that are convergence in mean, convergence in measure and convergence in distributio...

1995
Mabel M. TIDBALL Eitan ALTMAN

We develop a unifying approach for approximating a “limit" zero-sum game by a sequence of approximating games. We discuss both the convergence of the values and the convergence of optimal (or “almost" optimal) strategies. Moreover, based on optimal policies for the limit game, we construct policies which are almost optimal for the approximating games. We then apply the general framework to stat...

Journal: :ZOR - Meth. & Mod. of OR 1993
Eitan Altman

We present in this paper several asymptotic properties of constrained Markov Decision Processes (MDPs) with a countable state space. We treat both the discounted and the expected average cost, with unbounded cost. We are interested in (1) the convergence of nite horizon MDPs to the innnite horizon MDP, (2) convergence of MDPs with a truncated state space to the problem with innnite state space,...

Journal: :Journal of Machine Learning Research 2001
Eyal Even-Dar Yishay Mansour

In this paper we derive convergence rates for Q-learning. We show an interesting relationship between the convergence rate and the learning rate used in Q-learning. For a polynomial learning rate, one which is 1/t at time t where ω ∈ (1/2, 1), we show that the convergence rate is polynomial in 1/(1− γ), where γ is the discount factor. In contrast we show that for a linear learning rate, one whi...

1993
Mabel M. TIDBALL

We develop a unifying approach for approximating a \limit" zero-sum game by a sequence of approximating games. We discuss both the convergence of the values and the convergence of optimal (or \almost" optimal) strategies. Moreover, based on optimal policies for the limit game, we construct policies which are almost optimal for the approximating games. We then apply the general framework to stat...

Journal: :J. Computational Applied Mathematics 2011
Klaus Schiefermayr

Let E be the union of two real intervals not containing zero. Then Ln(E) denotes the supremum norm of that polynomial Pn of degree less than or equal to n, which is minimal with respect to the supremum norm provided that Pn(0) = 1. It is well known that the limit κ(E) := limn→∞ n √ Ln(E) exists, where κ(E) is called the asymptotic convergence factor, since it plays a crucial role for certain it...

2009
Guglielmo Maria Caporale Burcu Erdogan Vladimir Kuzin

This paper applies the Phillips and Sul (2007) method to test for convergence in stock returns to an extensive dataset including monthly stock price indices for five EU countries (Germany, France, the Netherlands, Ireland and the UK) as well as the US between 1973 and 2008. We carry out the analysis on both sectors and individual industries within sectors. As a first step, we use the Stock and ...

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