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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Sahand Communications in Mathematical Analysis
- نوع مقاله: Journal Article
- کلمات کلیدی: Integral operators,Besov spaces,Convex functions of complex order,Starlike functions of complex order,Schwarzian norm
- چکیده:
- چکیده انگلیسی: In this note, we study the integral operators $I_{g}^{gamma, alpha}$ and $J_{g}^{gamma, alpha}$ of an analytic function $g$ on convex and starlike functions of a complex order. Then, we investigate the same operators on $H^{infty}$ and Besov spaces.
- انتشار مقاله: 20-03-1398
- نویسندگان: Zahra Orouji,Ali Ebadian
- مشاهده
- جایگاه : پژوهشی
- مجله: Sahand Communications in Mathematical Analysis
- نوع مقاله: Journal Article
- کلمات کلیدی: Banach algebra,Upper Triangular Matrix,Generalized Spectral Radius,Joint Spectral Radius,Geometric Joint Spectral Radius
- چکیده:
- چکیده انگلیسی: In this paper, we discuss some properties of joint spectral {radius(jsr)} and generalized spectral radius(gsr) for a finite set of upper triangular matrices with entries in a Banach algebra and represent relation between geometric and joint/generalized spectral radius. Some of these are in scalar matrices, but some are different. For example for a bounded set of scalar matrices,$Sigma$, $r_*left(Sigmaright)= hat{r}left(Sigmaright)$, but for a bounded set of upper triangular matrices with entries in a Banach algebra($Sigma$), $r_*left(Sigmaright)neqhat{r}left(Sigmaright)$. We investigate when the set is defective or not and equivalent properties for having a norm equal to jsr, too.
- انتشار مقاله: 10-10-1396
- نویسندگان: Hamideh Mohammadzadehkan,Ali Ebadian,Kazem Haghnejad Azar
- مشاهده
- جایگاه : پژوهشی
- مجله: Sahand Communications in Mathematical Analysis
- نوع مقاله: Journal Article
- کلمات کلیدی: Reproducing kernel,Multipliers,Vector-valued spaces
- چکیده:
- چکیده انگلیسی: This paper is devoted to the study of reproducing kernel Hilbert spaces. We focus on multipliers of reproducing kernel Banach and Hilbert spaces. In particular, we try to extend this concept and prove some related theorems. Moreover, we focus on reproducing kernels in vector-valued reproducing kernel Hilbert spaces. In particular, we extend reproducing kernels to relative reproducing kernels and prove some theorems in this subject.
- انتشار مقاله: 01-08-1395
- نویسندگان: Saeed Hashemi Sababe,Ali Ebadian
- مشاهده
- جایگاه : پژوهشی
- مجله: Sahand Communications in Mathematical Analysis
- نوع مقاله: Journal Article
- کلمات کلیدی: integral operator,convex function,starlike function,Locally univalent,Ozaki's conditions
- چکیده:
- چکیده انگلیسی: Assume that $mathbb{D}$ is the open unit disk. Applying Ozaki's conditions, we consider two classes of locally univalent, which denote by $mathcal{G}(alpha)$ and $mathcal{F}(mu)$ as follows begin{equation*} mathcal{G}(alpha):=left{fin mathcal{A}:mathfrak{Re}left( 1+frac{zf^{prime prime }(z)}{f^{prime }(z)}right) <1+frac{alpha }{2},quad 0
frac{1 }{2}-mu,quad -1/2 - انتشار مقاله: 19-09-1394
- نویسندگان: Rahim Kargar,Ali Ebadian
- مشاهده
- جایگاه : پژوهشی
- مجله: Advances in Mathematical Finance and Application
- نوع مقاله: Journal Article
- کلمات کلیدی: Factor analysis,Credit ratings,analytic hierarchy process,Financial ratios,Non-financial ratios
- چکیده:
- چکیده انگلیسی: Implementation credit rating for Corporates is influenced by Different circum-stances, systems, processes, and cultures in each country. In this study, we pro-posed a Factor analysis modified approach for determine important factors on real data set of 123 accepted corporate in Tehran Securities Exchange for the years 2009-2017 of diverse range of 52 variable. We estimated the priority score for 49 factors. The three factors, Debt to Equity Ratio, Current debt-to-equity ratio and proprietary ratio exclude due to high correlation with others. The results indicated that three macroeconomic factors: Price Index of Consumer Goods and Services, exchange rate and Interest rate determinants were more effective on the credit ratings. In addition, Financial Ratios and non-Financial Ratios such as Return on equity (ROE), Long-term debt-to-equity ratio, Benefit of the loan, ratio of com-modity to working capital, Current capital turnover, Return on Working Capital, Quick Ratio, Current Ratio, Net Profit margin, Gross profit margin, had effect on credit rating accepted corporate in Tehran Securities Exchange. The Nonparametric statistical test to validate the consistency between AHP ranking and Factor analysis revealed, the new approach has a moderated consistency with AHP. In conclusion, the Factor analysis modified approach could be applied significantly to evaluate efficiency and ranking factors with minimum loss of information.
- انتشار مقاله: 21-02-1399
- نویسندگان: Ahmad Mohammaddoost,Mir Feiz Falah Shams Dialestani,Madjid Eshaghi Gordji,Ali Ebadian
- مشاهده