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Medimegh, Imen,Troudi, Wafa,Omrane, Ines,Ayari, Hajer,Uhrhummer, Nancy,Majoul, Hamdi,Benayed, Farhat,Mezlini, Amel,Bignon, Yves-Jean,Sibille, Catherine,Elgaaied, Amel Benammar Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.9
The purpose of this study is to assess the effect of consanguinity on breast cancer incidence in Tunisia. We conducted a case-control study to evaluate the involvement of heterozygote and homozygote haplotypes of BRCA1 gene SNPs according to consanguinity among 40 cases of familial breast cancer, 46 cases with sporadic breast cancer and 34 healthy controls. We showed significant difference in consanguinity rate between breast cancer patients versus healthy controls P=0.001. Distribution of homozygous BRCA1 haplotypes among healthy women versus breast cancer patients was significantly different; p=0.02. Parental consanguinity seems to protect against breast cancer in the Tunisian population.
The Persistence and Consequences of Share Repurchases
Sadok El Ghoul,Omrane Guedhami,Hyunseok Kim,Jungwon Suh 한국경영학회 2022 한국경영학회 통합학술발표논문집 Vol.2022 No.8
Firms primarily use cash flow to finance increasingly persistent repurchases. This internal financing gradually increases retained earnings in the capital structure and results in high (low) repurchase (investment) sensitivity to cash flow. These effects are particularly pronounced among financially mature firms. During recent decades, the repurchase–cash flow sensitivity of U.S. firms has increased steadily, with steeper increases for financially mature firms. Repurchases do not appear to be associated with underinvestment. A non-trivial number of firms would have depleted their retained earnings had they paid dividends rather than repurchased shares.
A UHF/UWB Monopole Antenna Design Process Integrated in an RFID Reader Board
Mekki Kawther,Necibi Omrane,Lakhdhar Saoussen,Gharsallah Ali 한국전자파학회 2022 Journal of Electromagnetic Engineering and Science Vol.22 No.4
This paper presents a new circular monopole antenna with triple-band characteristics that can operate in both ultra-high frequency (UHF) and ultra-wideband (UWB) and can be integrated into a radio-frequency identification (RFID) system reader board. The antenna was built with a patch and a coplanar waveguide (CPW) feed microstrip line to meet the UHF/UWB bandwidth requirements for RFID applications. The designed antenna has a size of 70 mm × 60 mm × 0.8 mm. CST Microwave Studio simulations were used to validate the proposed antenna, which had a maximum gain of 4.8 dBi. Furthermore, the designed antenna had a radiation pattern that spanned the full working band. To interact with RFID tags, the antenna was built and installed into the RFID reader board. The simulation and measurement findings showed good agreement. Experiments indicated that the UHF-RFID performance of the monopole antenna was comparable to that of existing commercial solutions.
The Persistence of Share Repurchases, Financing, and Growth
Sadok El Ghoul,Omrane Guedhami,Hyunseok Kim,Jungwon Suh 한국재무학회 2020 한국재무학회 학술대회 Vol.2020 No.08
This study documents evidence that share repurchases have become persistent in recent years, as an increasing number of firms repurchase shares year after year. This persistence means that share repurchases are now a long-term cash flow commitment. As a result, previous notions about share repurchases—such as considering them a means of distributing transitory cash flow, or a response to undervaluation or raising the debt ratio—have little explanatory power. Instead, share repurchases are linked to fast, consistent future growth, which is reflected in the high stock valuation of share repurchasing firms. Firms use cash flow as the primary source of capital to finance share repurchases year after year. This financing has cumulatively large effects on capital structure, as share repurchasing firms experience large, steady increases in retained earnings and comparable decreases in paid-in capital over time. On average, share repurchases do not displace investment, as share repurchasing firms invest actively to generate fast growth that in turn helps finance repeated share repurchases.
NOTE ON THE MULTIFRACTAL MEASURES OF CARTESIAN PRODUCT SETS
Attia, Najmeddine,Guedri, Rihab,Guizani, Omrane Korean Mathematical Society 2022 대한수학회논문집 Vol.37 No.4
In this paper, we shall be concerned with evaluation of multifractal Hausdorff measure 𝓗<sup>q,t</sup><sub>𝜇</sub> and multifractal packing measure 𝓟<sup>q,t</sup><sub>𝜇</sub> of Cartesian product sets by means of the measure of their components. This is done by investigating the density result introduced in [34]. As a consequence, we get the inequalities related to the multifractal dimension functions, proved in [35], by using a unified method for all the inequalities. Finally, we discuss the extension of our approach to studying the multifractal Hewitt-Stromberg measures of Cartesian product sets.
Equity Issuance and Cash Savings: New Evidence
Heejung Choi,Sadok El Ghoul,Omrane Guedhami,Eun Jung Lee,Jungwon Suh 한국경영학회 2023 한국경영학회 통합학술발표논문집 Vol.2023 No.8
We explore the forces that drive cash savings in equity issuance using the average cash-savings rate instead of the marginal cash-savings rate that overstates individual issuers’ cash savings. Equity issuers with high investment opportunities save more cash in anticipation of greater cash needs from fast post-issue growth. The precautionary motive, cash shortfalls, or market-timed equity issuance has limited influence on equity issuers’ cash savings decisions. Much of the previously documented virtuous effects of cash reflect hallmark characteristics of equity issuance, suggesting that the intrinsic value of cash is probably lower than indicated by previous research.
A New Class of Similarity Measures for Fuzzy Sets
Omran Saleh,Hassaballah M. Korean Institute of Intelligent Systems 2006 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.6 No.2
Fuzzy techniques can be applied in many domains of computer vision community. The definition of an adequate similarity measure for measuring the similarity between fuzzy sets is of great importance in the field of image processing, image retrieval and pattern recognition. This paper proposes a new class of the similarity measures. The properties, sensitivity and effectiveness of the proposed measures are investigated and tested on real data. Experimental results show that these similarity measures can provide a useful way for measuring the similarity between fuzzy sets.
Omran, Dalia Abd El Hamid,Awad, AbuBakr Hussein,Mabrouk, Mahasen Abd El Rahman,Soliman, Ahmad Fouad,Aziz, Ashraf Omar Abdel Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.1
Background:Hepatocellular carcinoma (HCC) is the second most common malignancy in Egypt. Data mining is a method of predictive analysis which can explore tremendous volumes of information to discover hidden patterns and relationships. Our aim here was to develop a non-invasive algorithm for prediction of HCC. Such an algorithm should be economical, reliable, easy to apply and acceptable by domain experts. Methods: This cross-sectional study enrolled 315 patients with hepatitis C virus (HCV) related chronic liver disease (CLD); 135 HCC, 116 cirrhotic patients without HCC and 64 patients with chronic hepatitis C. Using data mining analysis, we constructed a decision tree learning algorithm to predict HCC. Results: The decision tree algorithm was able to predict HCC with recall (sensitivity) of 83.5% and precession (specificity) of 83.3% using only routine data. The correctly classified instances were 259 (82.2%), and the incorrectly classified instances were 56 (17.8%). Out of 29 attributes, serum alpha fetoprotein (AFP), with an optimal cutoff value of ${\geq}50.3ng/ml$ was selected as the best predictor of HCC. To a lesser extent, male sex, presence of cirrhosis, AST>64U/L, and ascites were variables associated with HCC. Conclusion: Data mining analysis allows discovery of hidden patterns and enables the development of models to predict HCC, utilizing routine data as an alternative to CT and liver biopsy. This study has highlighted a new cutoff for AFP (${\geq}50.3ng/ml$). Presence of a score of >2 risk variables (out of 5) can successfully predict HCC with a sensitivity of 96% and specificity of 82%.
Delay in Gastric Emptying Rate Enhances Bioavailability of Sodium Salicylates in Rabbit
Omran M.O. Alhamami 대한약학회 2007 Archives of Pharmacal Research Vol.30 No.9
The effect of delay in gastric emptying rate (GER) caused by oil on the bioavailability of sodium salicylate was investigated. The bioavailability of sodium salicylate administered in aqueous, glycerin and oily vehicles was compared in rabbits. Glycerin (having no effect on GER and more viscous than oil) was used to eliminate the effect of viscosity of the oil on the bioavailability of the drug.. Glycerin formulation was compared with both aqueous and oily formulations using a two-way crossover test in eight rabbits, in each study. The results indicate that the oily formulation gave a lower rate of absorption and a greater extent of absorption than the other formulations. No significant difference in the rate and extent of absorption was shown between the two vehicles having no effect on GER (aqueous and glycerin vehicles). In conclusion, Delaying effect of the oil on the GER enhances significantly the bioavailability of salicylate. This enhancement is due to the physiological effect of the oil on the GER and not due to its viscosity. Possible reasons for the differences are discussed with particular reference to the effects of oil on the gastric emptying rate (GER).