A freehand sketching interface for progressive construction of 3D objects

Masry, M.,Kang, D.,Lipson, H. Elsevier 2005 Computers & graphics Vol.29 No.4

<P><B>Abstract</B></P><P>This paper presents an intuitive, freehand sketching application for Computer Aided Design (CAD) that can reconstruct a 3D object from a single, flat, freehand sketch. A pen is used to draw 2D sketches consisting of straight and curved strokes connected at vertices. The sketches are processed by a reconstruction algorithm that uses the angular distribution of the strokes and their connectivity to determine an orthogonal 3D axis system whose projection correlates with the observed stroke orientations. The axis system is used to determine a plausible depth for each vertex. This approach works well for drawings of objects whose edges predominantly conform to some overall orthogonal axis system. A second, independent optimization procedure is then used to reconstruct each curved stroke in the original sketch, assuming that the curve is planar. New strokes can be attached to the 3D object, or drawn directly onto the object's faces. An implementation of the reconstruction algorithm based on Levenberg–Marquardt optimization allows objects with over 50 strokes to be reconstructed in interactive time.</P>

Common Control Channel Allocation in Cognitive Radio Networks through UWB Communication

Masri, Ahmed M.,Chiasserini, Carla-Fabiana,Casetti, Claudio,Perotti, Alberto The Korea Institute of Information and Commucation 2012 Journal of communications and networks Vol.14 No.6

The implementation of a common control channel is one of the most challenging issues in cognitive radio networks, since a fully reliable control channel cannot be created without reserving bandwidth specifically for this purpose. In this paper, we investigate a promising solution that exploits the ultra wide band (UWB) technology to let cognitive radio nodes discover each other and exchange control information for establishing a communication link. The contribution of this paper is threefold: (i) We define the communication protocol needed to let cognitive radio nodes discover each other and exchange control information for link set up, (ii) we overcome the gap in coverage, which typically exists between UWB and long-medium range technologies, by using multi-hop communication, (iii) we evaluate the performance of our approach by adopting an accurate channel model and show its benefits with respect to an in-band signaling solution.

C-Flavonoidal Glycosides from Erythrina caffra Flowers

Sawsan El Masry,Hala M. Hammoda,Mohamed M. Radwan,Samir A. Ross,Hala H. Zaatout 한국생약학회 2010 Natural Product Sciences Vol.16 No.4

A phytochemical investigation of the ethanolic extract of Erythrina caffra flowers from an Egyptian origin yielded three C-flavonoidal glycosides; 5,7,4`-trihydroxyflavone-8-C-β-D-glucopyranoside (vitexin) (1), 5,7,4`-trihydroxyflavone-6-C-β-D-glucopyranosyl-(1→2)-β-D-glucopyranoside (isovitexin-2``-β-D-glucopyranoside) (2), 5, 7, 4`-trihydroxyflavone-6, 8-di-C-β-D-glucopyranoside (vicenin-2) (3) and one O-flavonoidal glycoside; kaempferol-3-O-β-D-glucopyranosyl) (1→2)-β-D-glucopyranoside (4). The structures of the isolated compounds (1 - 4) were elucidated using different spectral techniques (UV, 1D and 2D NMR and HRESIMS). This is the first report for the isolation of flavonoidal glycosides from Erythrina caffra. The antibacterial, antifungal, antimalarial, and antileishmanial activities of the isolates were evaluated. In addition, the cytotoxic activity of the ethanolic extract and the main fractions were tested using brine shrimp bioassay.

Common Control Channel Allocation in Cognitive Radio Networks through UWB Communication

Ahmed M. Masri,Carla-Fabiana Chiasserini,Claudio Casetti,Alberto Perotti 한국통신학회 2012 Journal of communications and networks Vol.14 No.6

The implementation of a common control channel is one of the most challenging issues in cognitive radio networks, since a fully reliable control channel cannot be created without reserving bandwidth specifically for this purpose. In this paper, we investigate a promising solution that exploits the ultra wide band (UWB) technology to let cognitive radio nodes discover each other and exchange control information for establishing a communication link. The contribution of this paper is threefold: (i) We define the communication protocol needed to let cognitive radio nodes discover each other and exchange control information for link set up,(ii) we overcome the gap in coverage, which typically exists between UWB and long-medium range technologies, by using multi-hop communication, (iii) we evaluate the performance of our approach by adopting an accurate channel model and show its benefits with respect to an in-band signaling solution.

Translation and Cultural Equivalence: A Study of Translation Losses in Arabic Literary Texts

Hanada Al-Masri 세종대학교 언어연구소 2009 Journal of Universal Language Vol.10 No.1

This article focuses on cultural translation, especially addressing the issue of cultural inequivalences or losses occurring in the translation of Arabic literary texts. The aim of this study is to investigate the translation strategies that led to cultural losses and to emphasize the important role of the translator as a cultural insider. The corpus is based on a collection of Arabic short stories written by Youssef Idris (1991). In order to illustrate cultural aspects in literature, we analyze figurative language (metaphors, idiomatic expressions, proverbs) in two texts: Arabic (the source text) and English (the target text). We argue that figurative language and cultural terms are unfamiliar and so are marked to the target reader on the grounds of the unmarked and should be looked at from the perspective of a cultural insider. The data is analyzed within Pike’s (1954) etic-emic approach to translation. The analysis has shown that translation of the source text was communicatively successful. However, it failed to represent the culture-bound and emotionally charged words which represent the implicit/emic level of the source text. The translator has failed to complete the cycle of etic-emic-etic, and so remained an outsider to both the source and target texts. The study concludes with the implication that a translator has to assume the role of a cultural insider for both texts in order to render a culturally more faithful translation.

Constituents of Erythrina caffra Stem Bark Grown in Egypt

Sawsan El-Masry,Hala M. Hammoda,Hala H. Zaatout,Saleh I. Alqasoumi,Maged S. Abdel-Kader 한국생약학회 2010 Natural Product Sciences Vol.16 No.4

A new 3-indolyl propionate alkaloid; (-) abrine (1), was isolated from the alcohol extract of Erythrina caffra stem bark together with the alkaloid (-) hypaphorine (2). Phytochemical investigation of the chloroform extract led to the isolation of one fatty alcohol; 1-octacosanol, isolated for the first time from genus Erythrina, two dienoid alkaloids; erythraline and erysodine, and three isoflavonoids; 3S (+) 2'-O-methylphaseollidinisoflavan (3), (6aR, 11aR)- 3-hydroxy-10-dimethylallyl-9-methoxypterocarpan, known as sandwicensin (4) and 3R (-) erythbidin A (5). It is worth mentioning that this is the first report for the isolation of these isoflavonoids from E. caffra. The absolute configuration of 3S (+) 2'-O-methylphaseollidinisoflavan (3) was not previously reported. The isolated isoflavonoids showed promising antibacterial activity against Staphylococcus aureus. Keywords - Erythrina caffra, alkaloids, isoflavanoids, Staphylococcus aureus

Using Denosumab as a Nonsurgical Management of Aneurysmal Bone Cysts in the Pelvis

Ayman Mohammad El Masry,Sherif Ishak Azmy,Mohamed Abdel Rahman Mustafa,Mohammad Abdelmoemen Abuelhadid 대한정형외과학회 2024 Clinics in Orthopedic Surgery Vol.16 No.1

Background: Aneurysmal bone cysts (ABCs) are infrequent, benign, and locally destructive lesions that most commonly occur during the first two decades of life. They usually affect the metaphysis of the long bones, but the pelvis is involved in 8%–12% of the cases. The management of pelvic ABCs is a challenging issue due to difficulties in choosing the appropriate approach, adjacent neurovascular bundles, the risk of intraoperative bleeding with difficulty achieving good hemostasis, and the risk of injury to the hip or sacroiliac joints. Limited data exist concerning the use of denosumab as a non-surgical treatment for pelvic ABCs. Our hypothesis was that denosumab might be an effective and safe solo treatment of cases with ABCs in the pelvis. Methods: We retrospectively assessed 20 patients with ABCs in the pelvis, who were treated by denosumab as a solo agent without surgery. Patients were assessed regarding disease control, the incidence of recurrence and non-oncological complications, and functional outcome. Results: The mean follow-up period was 38.5 months. Disease control was achieved in 16 patients (80%), with no local recurrence. Tolerable drug-related complications occurred in 15% of cases. The mean Musculoskeletal Tumor Society score was 92.3%. Conclusions: Denosumab may provide a reliable option in the nonsurgical treatment of ABCs of pelvic origin with expected lower morbidity than the surgical solution and tolerable complications. Further studies on the safety profile and long-term effects of denosumab especially in skeletally immature patients are required.

Cross-Section Properties and Elastic Lateral-Torsional Buckling Capacity of Steel Delta Girders

Omar Y. El Masri,Eric M. Lui 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.3

In this paper, the behavior of slender steel delta girders (SDG) is investigated both analytically and numerically. In the analytical analysis, closed-form equations for cross-section properties of SDG are derived. They are then compared with solutions obtained numerically. Using these cross-section properties, the theoretical elastic lateral-torsional buckling (LTB) strength of these girders are determined and compared with results obtained from a fi nite element analysis. The results show that the theoretical LTB equation derived for general open monosymmetric I-sections can be applied to these delta girders. Additionally, it is shown that a simplifi ed expression for the coeffi cient of monosymmetry x derived for I-sections can be used in the computation of LTB strength for SDG. A parametric study is then performed to demonstrate the eff ectiveness of SDG in achieving a favorable strength-to-weight ratio when compared to standard I-section members. Based on the results of this parametric study, it is recommended that the height and width of the delta region of the cross-section be equal to two-fi fth the height of the web and three-quarter the width of the compression fl ange, respectively.

16S Ribosomal RNA 유전자 증폭에 의한 Leptospira interrogans 검출

정석찬,구복경,문진산,정병열,박용호,양창근,최원필,조현주,Masri, S.A. 한국수의공중보건학회 1998 예방수의학회지 Vol.22 No.1

Leptospira interrogans의 16S 및 5S Ribosomal RNA 유전자 염기서열 분석

정석찬,구복경,문진산,정병열,박용호,양창근,최원필,조현주,Masri, S.A. 한국수의공중보건학회 1998 예방수의학회지 Vol.22 No.1