DYADIC REPRESENTATION OF THE RUDIN-SHAPIRO COEFFICIENTS WITH APPLICATIONS

ABDOLLAHI, A.,TAGHAVI, M. 한국전산응용수학회 2005 Journal of applied mathematics & informatics Vol.18 No.1

The coefficients of the Rudin-Shapiro polynomials are $\pm1$. In this paper we first replace-1 coefficient by 0 which on that case the structure of the coefficients will be on base 2. Then using the results obtained for the numbers on base 2, we introduce a quite fast algorithm to calculate the autocorrelation coefficients. Main facts: Regardless of frequencies, finding the autocorrelations of those polynomials on which their coefficients lie in the unit disk has been a telecommunication's demand. The Rudin-Shapiro polynomials have a very special form of coefficients that allow us to use 'Machine language' for evaluating these values.

NUMERICAL RANGE AND SOT-CONVERGENCY

ABDOLLAHI, ABDOLAZIZ,HEYDARI, MOHAMMAD TAGHI Korean Mathematical Society 2015 대한수학회논문집 Vol.30 No.3

A sequence of composition operators on Hardy space is considered. We prove that, by numerical range properties, it is SOT-convergence but not converge.

Determination of a Change Point in the Age at Diagnosis of Breast Cancer Using a Survival Model

Abdollahi, Mahbubeh,Hajizadeh, Ebrahim,Baghestani, Ahmad Reza,Haghighat, Shahpar Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.no.sup3

Breast cancer, the second cause of cancer-related death after lung cancer and the most common cancer in women after skin cancer, is curable if detected in early stages of clinical presentation. Knowledge as to any age cut-off points which might have significance for prognostic groups is important in screening and treatment planning. Therefore, determining a change-point could improve resource allocation. This study aimed to determine if a change point for survival might exist in the age of breast cancer diagnosis. This study included 568 cases of breast cancer that were registered in Breast Cancer Research Center, Tehran, Iran, during the period 1986-2006 and were followed up to 2012. In the presence of curable cases of breast cancer, a change point in the age of breast cancer diagnosis was estimated using a mixture survival cure model. The data were analyzed using SPSS (versions 20) and R (version 2.15.0) software. The results revealed that a change point in the age of breast cancer diagnosis was at 50 years age. Based on our estimation, 35% of the patients diagnosed with breast cancer at age less than or equal to 50 years of age were cured while the figure was 57% for those diagnosed after 50 years of age. Those in the older age group had better survival compared to their younger counterparts during 12 years of follow up. Our results suggest that it is better to estimate change points in age for cancers which are curable in early stages using survival cure models, and that the cure rate would increase with timely screening for breast cancer.

The impact of Learning strategies on reading comprehension among Foreign learners of Persian

Abdollahi Parsa, Tahere,Fahime Ghapandari Bidgoli 한국중동학회 2022 韓國 中東 學會 論叢 Vol.43 No.1

Reading and comprehension skill as one of the four main language skills is a complex process that can be facilitated by learning strategies. The utilization of learning strategies in reading leads to a better and deeper understanding of language by learners. Researches show that the usage of learning strategies impacts on reading and comprehension to a great extent, but so far It has not been done on Persian learners with different languages and dialects. As it seems necessary to pay attention to this field, the present study investigates the learning strategies used by foreign learners of Persian and its effect on reading comprehension. For this purpose, the reading texts of Parfa book (intermediate level) have been used. Applicants (40) are randomly divided into the control group (20) and the experimental group (20). The experimental group received the reading texts using Oxford (1990) language strategies and the control group received them through the traditional method. They were taught online through the Adobe Connect platform within ten hours. At first a pre-test was conducted for both control and experimental group and after ten-hour training a post-test was taken. Statistical analysis and the t-test results shows the experimental group outperformed the control group and the learning strategies are efficient. Also, to determine the most effective strategies in reading and comprehension among foreign learners of Persian, interviews were conducted with their lecturers and it was found that metacognitive strategies are more effectual than other strategies.

Influence of Palm Kernel Meal Inclusion and Exogenous Enzyme Supplementation on Growth Performance, Energy Utilization, and Nutrient Digestibility in Young Broilers

Abdollahi, M.R.,Hosking, B.J.,Ning, D.,Ravindran, V. Asian Australasian Association of Animal Productio 2016 Animal Bioscience Vol.29 No.4

The objective of the present study was to investigate the influence of palm kernel meal (PKM) inclusion and exogenous enzyme supplementation on growth performance, nitrogen-corrected apparent metabolizable energy (AMEn), coefficient of apparent ileal digestibility (CAID) and total tract retention of nutrients in young broilers fed corn-based diets. Four inclusion levels of PKM (no PKM [PKM0], 8% [PKM8], 16% [PKM16], and 24% [PKM24]) and two enzyme additions were evaluated in a $4{\times}2$ factorial arrangement of treatments. A total of 384, one-d-old male broilers (Ross 308) were individually weighed and allocated to 48 cages (eight broilers/cage), and cages were randomly assigned to eight dietary treatments. Results indicated that the inclusion of 8% and 16% PKM increased (p<0.05) the weight gain compared to the PKM0 diet. Birds fed the PKM8 diets had the highest (p<0.05) feed intake. Weight gain and feed intake were severely reduced (p<0.05) by feeding the PKM24 diet. Enzyme supplementation increased weight gain (p<0.05), independent of PKM inclusion level. In PKM0 and PKM8 diets, enzyme addition significantly (p<0.05) lowered feed conversion ratio (FCR); whereas enzyme addition had no effect on FCR of birds fed PKM16 and PKM24 diets. In PKM0 and PKM16 diets, enzyme addition significantly (p<0.05) increased CAID of nitrogen and energy but had no effect in the PKM8 and PKM24 diets. Inclusion of PKM into the basal diet, irrespective of inclusion level, enhanced (p<0.05) starch and fat digestibility. Inclusion of PKM at 16% and 24% resulted in similar CAID of neutral detergent fiber (NDF) but higher (p<0.05) than that of the PKM0 and PKM8 diets. Enzyme addition, regardless of the level of PKM inclusion, significantly (p<0.05) increased CAID of NDF. There was a significant (p<0.05) decrease in AMEn with PKM inclusion of 24%. The present data suggest that inclusion of PKM in broiler diets could be optimized if PKM-containing diets are formulated based on digestible amino acid contents and supplemented with exogenous enzymes. If amino acid digestibility and AME of PKM considered in the formulation, it can be included in broiler diets up to 16% with no deleterious effects on growth performance.

Effects of Implicit vs. Explicit Green Claims for Inherently Ungreen Products on Consumers’ Virtual Nature Experience, Brand Attitude, and Purchase Intention

Maral Abdollahi,Jacqueline Parr,허지수 한국PR학회 2020 PR연구 Vol.24 No.4

Objectives This study examined effects of green claims made by inherently ungreen product companies, specifically focusing on whether implicit green claims using natural imagery would be more effective than explicit green claims using detailed environmental statements. We compared the effects of implicit vs. explicit green claims on consumers’ virtual nature experience, brand attitude, and purchase intention. Methods Two rounds of online experiments were conducted with a sample of 350 U.S. adults and experimental stimuli representing the two different green claim conditions. Results Overall, our results show that implicit green claims lead to stronger virtual nature experience than explicit green claims. In other words, inherently ungreen products that are traditionally perceived as not environmentally friendly and not associated with nature can be transformed by an implicit green claim to evoke virtual nature experience. In contrast to previous findings, which showed that implicit green claims positively influenced brand attitude, our study findings demonstrate no such effects in the context of inherently ungreen products. Conclusions Our results show that male and female participants respond differently regarding virtual nature experience and purchase intention across claim types.

Epidemiology of Hypertension in City Population of Golestan Province, Iran

AA.Abdollahi(M.Se),A.Hosseini(M.Se),H.Rahmani(M.Se),Naser Behnampour(M.Se, Statiei 한국간호과학회 2007 한국간호과학회 학술대회 Vol.2007 No.11

Radical Copolymerization of Acrylic Acid and OEGMA475: Monomer Reactivity Ratios and Structural Parameters of the Copolymer

Hossein Abdollahi,Vahid Najafi,Farshid Ziaee,Kourosh Kabiri,Farhad Narimani 한국고분자학회 2014 Macromolecular Research Vol.22 No.12

Alternative copolymers of acrylic acid (AA) and oligo(ethylene glycol) methyl ether methacryate (475 g/mol (OEGMA475)) macromer, having various amounts of two monomers, were synthesized using aqueous solutionfree radical copolymerization at 50 °C with ammonium persulfate (APS) as an initiator. The structures of the copolymerswere confirmed by nuclear magnetic resonance (NMR) spectroscopy. In fact, samples with different molarratios of two monomers in deionized water were prepared and subsequently copolymerization reaction was performedto low conversion levels (below 10%). Monomer reactivity ratios of OEGMA475, AA pair were estimatedusing the Finemann-Ross (FR), inverted Finemann-Ross (IFR), Kelen-Tüdös (KT), extended Kelen-Tüdös (EKT),Mayo-Lewis (ML) and Yezrelieve-Brokhina-Roskin (YBR) graphical methods. The value ranged from 0.908 to0.963 for rOEGMA and from 0.208 to 0.243 for rAA depending on conversion percentage and calculation methods ofmonomer reactivity ratios. In all the cases, rOEGMA×rAA<1 and rOEGMA>rAA indicate that the resulting copolymer has atendency toward alternation with an azeotropic point in MOEGMA=0.905. Structural parameters of the copolymerswere obtained by calculating the dyad monomer sequence fractions and the mean sequence length. Keywords: oligo(ethylene glycol) methyl ether methacrylate, acrylic acid, monomer reactivity ratios, altern

Synthesis, characterization and comparison of PAM, cationic PDMC and P(AM-co-DMC) based on solution polymerization

Zohreh Abdollahi,Masoud Frounchi,Susan Dadbin 한국공업화학회 2011 Journal of Industrial and Engineering Chemistry Vol.17 No.3

High molecular weight homopolymers of acrylamide (PAM) and (2-methacryloyloxyethyl) trimethyl ammonium chloride (PDMC) and copolymer ofDMC with acrylamide (P(AM-co-DMC)) were synthesized using solution polymerization technique. The synthesized polymers were characterized by Fourier transform infrared (FTIR), 1HNMR, 13CNMR spectroscopy and differential scanning calorimetry (DSC)and viscometery. 1HNMR and 13CNMR studies confirmed the structure of the synthesized polymers. The behavior of the synthesized polymers was investigated in water–acetone and water–methanolmixtures. The plot of intrinsic viscosity of either PAM or P(AM-co-DMC) with respect to acetone (methanol)/water ratio in water–acetone (methanol) demonstrated a maximum indicating a balance between acetone or methanol hydrogen bonds with water and non-solvency effect of acetone or methanol. However, the intrinsic viscosity of PDMC decreased steadily with increasing acetone (methanol)/water ratio. The jar test results with kaolin suspensions demonstrated the best clarification with PDMC as flocculant whilst the largest size of flocs obtained using PAM.

Satellite Attitude Tracking for Earth Pushbroom Imaginary with Forward Motion Compensation

Abbas Abdollahi,Mohamad Reza Dastranj,Amin Reza Riahi 보안공학연구지원센터 2014 International Journal of Control and Automation Vol.7 No.1