Horizontal deformation in South Korea from permanent GPS network data, 2000-2003

Hamdy, A. M.,Park, P.-H.,Lim, H.-C. TERRA SCIENTIFIC PUBLISHING COMPANY 2005 Earth, planets, and space Vol.57 No.2

Generalization of the memory integer model for the analysis of the quasi-static behaviour of polyurethane foams

Hamdi Jmal,Ming Lei Ju,Raphael Dupuis,Evelyne Aubry 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.11

Polyurethane foam is a cellular material characterized by an interesting mechanical spectrum of properties: low density, capacity to absorbthe deformation energy and low stiffness. This spectrum of properties makes polyurethane foam commonly used in many thermal,acoustic and comfort applications. Several models, such as memory, hyper-elastic and pseudo-elastic models have been developed in theliterature to describe the mechanical response of polyurethane foam under quasi-static and dynamic test conditions. The main disadvantageof these models is the dependence of their parameters against the test conditions (strain rate, maximum compression level, etc). Thisaffects the general character of their representativeness to the quasi-static and dynamic behaviours of polyurethane foam. The main goalof this article is to implement reliable mechanical model which is able to provide the quasi-static response of the polyurethane foam underdifferent strain rates and large compressive deformation. The dimensional parameters of our model can be expressed by the productof two independent parts; the first contain only the test conditions and the second define the dimensionless and invariant parameters thatcharacterize the foam material. The developed model has been proposed after several experimental studies allowing the apprehension ofthe quasi-static behaviour (through unidirectional compression tests). The polyurethane foam, under large deformations, exhibits anonlinear elastic behaviour and viscoelastic behaviour. To assess the ability of our model to be a general representation, three industrialpolyurethane foams have been considered.

Synthesis and cation complexation of calix[4]azacrowns and a spirobiscalix[4]azacrown

Hamdi, Abdelwaheb,Noomen, Mohamed Habib,Abidi, Rym,Woo, A. Rim,Cho, Jeong Hwan,Kim, Yang Springer-Verlag 2011 JOURNAL OF INCLUSION PHENOMENA AND MACROCYCLIC CHE Vol.71 No.3

GRADED PRIMITIVE AND INC-EXTENSIONS

Hamdi, Haleh,Sahandi, Parviz Korean Mathematical Society 2018 대한수학회논문집 Vol.33 No.2

It is well-known that quasi-$Pr{\ddot{u}}fer$ domains are characterized as those domains D, such that every extension of D inside its quotient field is a primitive extension and that primitive extensions are characterized in terms of INC-extensions. Let $R={\bigoplus}_{{\alpha}{{\in}}{\Gamma}}$ $R_{\alpha}$ be a graded integral domain graded by an arbitrary torsionless grading monoid ${\Gamma}$ and ${\star}$ be a semistar operation on R. The main purpose of this paper is to give new characterizations of gr-${\star}$-quasi-$Pr{\ddot{u}}fer$ domains in terms of graded primitive and INC-extensions. Applications include new characterizations of UMt-domains.

Multistage Point and Confidence Interval Estimation of the Shape Parameter of Pareto Distribution

Hamdy, H.I.,Son, M.S.,Gharraph, M.K.,Rashad, A.M. The Korean Statistical Society 2003 Communications for statistical applications and me Vol.10 No.3

This article presents the asymptotic theory of triple sampling procedure as pertain to estimating the shape parameter of Pareto distribution. Both point and confidence interval estimation are considered within the same inference unified framework. We show that this group sampling technique possesses the efficiency of Anscome (1953), Chow and Robbins (1965) purely sequential procedure as well as reduce the number of sampling operations by utilizing Stein (1945) two stages procedure. The analysis reveals that the technique performs excellent as far as the accuracy is concerned. The present problem differs from those considered by many authors, in multistage sampling, in that the final stage sample size and the parameter's estimate become highly correlated and therefore we adopted different approach.

UPPERS TO ZERO IN POLYNOMIAL RINGS OVER GRADED DOMAINS AND UMt-DOMAINS

Hamdi, Haleh,Sahandi, Parviz Korean Mathematical Society 2018 대한수학회보 Vol.55 No.1

Let $R={\bigoplus}_{{\alpha}{\in}{\Gamma}}\;R_{\alpha}$ be a graded integral domain, H be the set of nonzero homogeneous elements of R, and ${\star}$ be a semistar operation on R. The purpose of this paper is to study the properties of $quasi-Pr{\ddot{u}}fer$ and UMt-domains of graded integral domains. For this reason we study the graded analogue of ${\star}-quasi-Pr{\ddot{u}}fer$ domains called $gr-{\star}-quasi-Pr{\ddot{u}}fer$ domains. We study several ring-theoretic properties of $gr-{\star}-quasi-Pr{\ddot{u}}fer$ domains. As an application we give new characterizations of UMt-domains. In particular it is shown that R is a $gr-t-quasi-Pr{\ddot{u}}fer$ domain if and only if R is a UMt-domain if and only if RP is a $quasi-Pr{\ddot{u}}fer$ domain for each homogeneous maximal t-ideal P of R. We also show that R is a UMt-domain if and only if H is a t-splitting set in R[X] if and only if each prime t-ideal Q in R[X] such that $Q{\cap}H ={\emptyset}$ is a maximal t-ideal.

Anuria in a 9-Month-Old Infant Resulting from Ureteral Cystine Stones

Hamdy Aboutaleb 대한비뇨의학회 2011 Investigative and Clinical Urology Vol.52 No.9

Pediatric urolithiasis and calcular anuria in early infancy are rare. Cystine stones may develop in utero or during early infancy. We report the case of a female 9-month-old infant with obstructive anuria resulting from cystine stones in a single functioning unit. She presented to the emergency department owing to the absence of micturition for 3 days. Radiological investigations revealed four left ureteral stones and an atrophic right kidney resulting from a calcular obstruction. Her laboratory values were as follows: serum creatinine 6.7 mg/dl, Na 132 mEq/l, K 6 mg/dl, and hematocrit 32%. An urgent percutaneous nephrostomy tube was inserted into the left side for urinary drainage, and her serum levels of creatinine and K returned to normal within 3 days. A left ureterolithotomy was the final management. Stone analysis revealed pure cystine crystals.

Testicular Biopsy Histopathology as an Indicator of Successful Restoration of Spermatogenesis after Varicocelectomy in Non-obstructive Azoospermia

Hamdy Abdelmawla Aboutaleb,Eid Abdel-Rasoul Elsherif,Mohammed Kamal Omar,Tarek Mohammed Abdelbaky 대한남성과학회 2014 The World Journal of Men's Health Vol.32 No.1

Purpose: We aimed to evaluate the efficacy of using testicular biopsy histopathology as an indicator of the success of loupe-assisted subinguinal varicocelectomy in non-obstructive azoospermia (NOA) patients.Materials and Methods: In a 2-year period, a prospective study was carried at Minoufiya University Hospital on 20 NOA patients with clinical bilateral varicoceles. These patients underwent loupe-assisted subinguinal varicocelectomy with simultaneous testicular biopsy. All patients were evaluated by determining their hormonal profile and performing semen analyses and scrotal Doppler and transrectal ultrasonography. Two semen analyses showing azoospermia were performed before the surgery and two semen analyses were received at 3 and 6 months post-operatively for follow-up.Results: The mean age was 29.9±6.7 years, and the mean follow-up duration was 17.3±8.3 months. We noted the restoration of spermatogenesis in six men (30% of all patients). Testicular biopsy results were as follows: hypospermatogenesis in 7 patients, maturation arrest in 3, and Sertoli cell-only syndrome in 10. The improvement in the sperm counts of these patients ranged from 3 million to 15 million/mL. Sperms were recovered in the hypospermatogenesis (6 patients, 85.5%) patients only, but other patients with testicular biopsy results of Sertoli cell-only or maturation arrest did not show any improvement in their semen parameters. Conclusions: Testicular biopsy results showed that hypospermatogenesis patients have a better chance of improvement in their semen analysis after varicocelectomy in contrast to NOA patients with Sertoli cell-only syndrome or maturation arrest.

CAD model simplification using a removing details and merging faces technique for a FEM simulation

Hamdi Mounir,Aifaoui Nizar,Benamara Abdelmajid 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.11

The simulation process is currently used in the design and dimensioning of mechanical parts. With the progress of computer materials,the finite elements method (FEM) becomes the most used approach in the simulation of mechanical behaviour. The simulation process needs multiple Design-FEM loops. In order to accelerate those analysis loops, an adaptation of computer aided design (CAD) model is necessary. The adaptation step consists in the simplification of the CAD model geometry by eliminating details (holes, chamfers, fillet,etc.) and faces. In this paper, a novel technique of simplification of the CAD geometry is developed. This technique is a hybrid method based on a combination of the elimination details and merging faces. The merging of faces is based on the energetic method. With this approach, the computing time is reduced by the elimination of geometric details which do not boundary conditions. An implementation of the proposed algorithm on the Open Cascade platform is also presented. The results of the developed method are compared with a previous publication. The reduction of the computing time and the amelioration of the result precision highlight the efficiency of the presented method.

Reconstruction of an Amputated Glans Penis With a Buccal Mucosal Graft: Case Report of a Novel Technique

Hamdy Aboutaleb 대한비뇨의학회 2014 Investigative and Clinical Urology Vol.55 No.12

Penile amputation is a rare catastrophe and a serious complication of circumcision. Reconstruction of the glans penis may be indicated following amputation. Our reportdiscusses a novel technique for reconfiguration of an amputated glans penis 1 year aftera complicated circumcision. A 2-year-old male infant presented to us with glans penisamputation that had occurred during circumcision 1 year previously. The parents complainedof severe meatal stenosis with disfigurement of the penis. Penis length was 3cm. Complete penile degloving was performed. The distal part of the remaining peniswas prepared by removing fibrous tissue. A buccal mucosal graft was applied to thedistal part of the penis associated with meatotomy. The use of a buccal mucosal graftis a successful and simple procedure with acceptable cosmetic and functional resultsfor late reconfiguration of the glans penis after amputation when penile size is suitable.