A New Hotbed for Extremism? Jihadism and Collective Insecurity in the Sahel

Hamdy A. Hassan 서울대학교 통일평화연구원 2020 Asian Journal of Peacebuilding Vol.8 No.2

Several jihadist groups sought a safe haven in the Sahel region following the defeat of Daesh in Syria and Iraq, making it a hotbed of terrorist activities. These groups have relied on crime, amongst other strategies, to survive and expand. Such strategies serve as the groups’ lifeblood and help them forge alliances with local actors. The appeal of radical jihadist discourse capitalizes on human insecurities as manifested in political, environmental, and demographic challenges. This article considers not only the new threats to human security in the Sahel, but also the need for a multidimensional, inclusive, dialogue-based solution. Promoting development and social cohesion centered on human security could achieve better results in the region than resorting to external military intervention.

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.

Euler-Maruyama Numerical solution of some stochastic functional differential equations

Hamdy M. Ahmed 한국산업응용수학회 2007 Journal of the Korean Society for Industrial and A Vol.11 No.1

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Durable Response of Androgen Receptor-Positive Male Breast Cancer to Goserelin

Hamdy Abdel Azim,Loay Kassem,Kyrillus Samaan Shohdy,Boules Eshaak,Shady Elia Anis,Nermine Shawky Kamal 한국유방암학회 2019 Journal of breast cancer Vol.22 No.1

The luteinizing hormone-releasing hormone/androgen receptor (LHRH/AR) pathway is a promising treatment target in a subgroup of female patients with triple-negative breast cancer (TNBC). However, very little is known about the efficacy of this strategy in male patients with TNBC. In this report, we describe a male patient with AR-positive TNBC who was successfully treated using an LHRH agonist after pretreatment with several lines of chemotherapy and achieved a durable response. We also review the existing evidence supporting LHRH- and AR-targeted therapy for this rare disease.

Modified models predicting punching capacity of edge column-slab joints considering different codes

Hamdy A. Elgohary,Mohamed A. El Zareef 국제구조공학회 2024 Structural Engineering and Mechanics, An Int'l Jou Vol.89 No.4

Significant changes have been made to estimate the punching shear capacity for edge column-slab joints in the latest editions of most current codes. The revised equations account for axial forces as well as moments conveyed to columns from slabs, which have a substantial impact on the punching resistance of such joints. Many key design parameters, such as reinforcement-ratio, concrete strength, size-effect, and critical-section perimeter, were treated differently or even ignored in various code provisions. Consequently, wide ranges of predicted punching shear strength were detected by applying different code formulas. Therefore, it is essential to assess the various current Codes’ design-equations. Because of the similarity in estimated outcomes, only the ACI, EC, and SNiP are used in this study to cover a wide range of estimation ranges from highly conservative to unconservative. This paper is devoted to analyzing the techniques in these code provisions, comparing the estimated punching resistance with available experimental data, and finally developing efficient models predicting the punching capacity of edge column-slab connections. 63 samples from past investigations were chosen for validation. To appropriately predict the punching shear, newly updated equations for ACI and SNiP are provided based on nonlinear regression analysis. The proposed equations’ results match the experimental data quite well.

Capacity Magnification by Imposing Composite Action of Precast Concrete Flanged Girders

Hamdy M. Afefy,Nesreen M. Kassem,Salah El-Din F. Taher 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.7

This paper presents an experimental study in order to verify the efficiency of different connecting techniques in improving thehorizontal shear resistance of composite concrete flanged beams. The studied composite beams consisted of precast concrete websinterconnected with precast concrete flanges. Different connecting techniques had been considered; namely, plain/reinforced Ultra-High-Performance Strain-Hardening Cementitious Composites (UHP-SHCC) shear pockets, UHP-SHCC shear buckets in the flangeaccommodated extended steel dowels from the web, unbonded internal steel fasteners and intermediate shear intrusions. Eightcomposite flanged beams incorporating different connecting techniques along with three reference beams; monolithic, successivelycast flanged beam and unconnected web/flange beams were prepared and tested up to failure under two cycles of non-reversalrepeated loading. Furthermore, the push-off test method was employed in order to determine the horizontal shear resistance of theused connecting techniques. Each technique came up with advantages and disadvantages. Therefore, it is a matter of compromise todecide the most appropriate technique according to the necessary criteria (ultimate capacity or ductility). Finally, the horizontal shearresistances were calculated based on the experimental findings and compared with the stipulated resistances in the ECP 203-2007and the ACI 318-14 design codes. It was found that the design codes’ values showed conservative results.

Proposed program for monitoring recent Crustal movement in Korean Peninsula

Hamdy, Ahmed M.,Jo, Bong-Gon Korean Society of Earth and Exploration Geophysici 2002 지구물리 Vol.5 No.4

한반도는 동아시아 활성 경계부의 끝에 위치해있다. 한반도에서의 지진 활동은 이웃나라인 중국과 일본에 비해서 상대적으로 낮은 편이다. 한반도에서의 지진정보에 따르면 한반도는 지진재해로부터 완전히 안전하지는 않다. 게다가, 한반도 주위의 "태평양, 필리핀해, 유라시아, 남중국"같은 구조적 판들의 상대적인 움직임의 결과로 생긴 다양한 구조적 힘에 의해 둘러 싸여져 있다. 현재 남한에는 5개의 정부기관에서 서로의 필요에 따라 설치한 65개의 GPS관측소를 가지고 있다. 한반도에서의 지진피해를 최소화하기 위해 현재, 앞서 언급한 지진관측소 중 몇 개의 관측소로부터의 GPS관측 자료와 한반도 내부와 주변부의 구조적 환경들을 함께 고려하여 근대의 지각운동을 관찰하는 프로그램이 계획되어 왔다. 이 프로그램은 두개의 주요 부분으로 이루어져 있으며, 첫째부분은 주변 국가인 "중국, 일본"과 협력하여 한반도 주위의 지각 변형을 모니터링하기 위한 것인데, 이 부분은 "East Sea Phase and Yellow Sea Phase" 두개의 페이스로 구성되어 있다 이러한 페이스들은 "East Sea Phase and Yellow Sea Phase"에서 각각의 변형 파라미터들을 결정하는데 도움을 줄 것이다. 한편, 이 프로그램의 두번째 부분은 한반도 주요 단층 내부와 주변의 변형 파라미터와 한반도-제주도 간의 상대운동을 결정하기 위해 계획되었다. 이번 연구를 통해서 다양한 지구 역학적 방법의 적용을 위한 신빙성 있는 자료로서 사용되기 위해, 앞서 언급한 관측소에서의 지각운동 중심부에서 기록된 자료의 필요성이 부각되었다. The Korean peninsula is located at the edge of the East Asian active margin. The seismic activity in the Korean Peninsula is relatively low compared with the neighboring countries China and Japan. According to the available Seismic information, the Korean Peninsula is not totally safe from the Earthquake disaster. Moreover, the area is surrounded by varies tectonic forces which is resulted from the relative movements of the surrounding tectonic plates "Pacific, Philippine Sea, Eurasian and South China". Nowadays South Korea has 65 GPS stations belong to 5 governmental organizations "each organization figure out its own GPS stations for different requirements" In order to minimize the seismic hazard in the Korean Peninsula a program for monitoring the recent crustal movement has been designed considering the uses of the available GPS station "some selected stations from the previously mentioned stations" and the tectonic settings in and around the Korean Peninsula. This program is composed of two main parts, the first part to monitor the crustal deformation around the Korean Peninsula with the collaboration of the surrounding countries "China and Japan" this part is composed of two phases "East Sea Phase and Yellow Sea Phase". These phases will be helpful in determining the deformation parameters in the East Sea and the Yellow Sea respectively While the Second part of this program, is designed to determine the deformation parameters id and around the main faults in the Korean Peninsula and the relative movement between the Korean Peninsula and the Cheju Island. Through out this study the needs of crustal movement center rose up to collect the data from the previously mentioned stations and Organizations in order to use such reliable data in different geodynamical application.

Strengthening of Cutouts in Existing One-Way Spanning R. C. Flat Slabs Using CFRP Sheets

Hamdy K. Shehab,Ahmed S. Eisa,Kareem A. El-Awady 한국콘크리트학회 2017 International Journal of Concrete Structures and M Vol.11 No.2

Openings in slabs are usually required for many different applications such as aeriation ducts and air conditioning. Opening in concrete slabs due to cutouts significantly decrease the member stiffness. There are different techniques to strengthen slabs with opening cutouts. This study presents experimental and numerical investigations on the use of Carbon Fiber Reinforced Polymers (CFRP) as strengthening material to strengthen and restore the load carrying capacity of R.C. slabs after having cutout in the hogging moment region. The experimental program consisted of testing five (oneway spanning R.C. flat slabs) with overhang. All slabs were prismatic, rectangular in cross-section and nominally 2000 mm long, 1000 mm width, and 100 mm thickness with a clear span (distance between supports) of 1200 mm and the overhang length is 700 mm. All slabs were loaded up to 30 kN (45% of ultimate load for reference slab, before yielding of the longitudinal reinforcement), then the load was kept constant during cutting concrete and steel bars (producing cut out). After that operation, slabs were loaded till failure. An analytical study using finite element analysis (FEA) is performed using the commercial software ANSYS. The FEA has been validated and calibrated using the experimental results. The FE model was found to be in a good agreement with the experimental results. The investigated key parameters were slab aspect ratio for the opening ratios of [1:1, 2:1], CFRP layers and the laminates widths, positions for cutouts and the CFRP configurations around cutouts.

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.

Simplified Design Procedure for Reinforced Concrete Columns Based on Equivalent Column Concept

Hamdy M. Afefy,El-Tony M. El-Tony 한국콘크리트학회 2016 International Journal of Concrete Structures and M Vol.10 No.3

Axially loaded reinforced concrete columns are hardly exist in practice due to the development of some bending moments. These moments could be produced by gravity loads or the lateral loads. First, the current paper presents a detailed analysis on the overall structural behavior of 15 eccentrically loaded columns as well as one concentrically loaded control one. Columns bent in either single curvature or double curvature modes are tested experimentally up to failure under the effect of different end eccentricities combinations. Three end eccentricities ratio were studied, namely, 0.1b, 0.3b and 0.5b, where b is the column width. Second, an expression correlated the decay in the normalized axial capacity of the column and the acting end eccentricities was developed based on the experimental results and then verified against the available formula. Third, based on the equivalent column concept, the equivalent pin-ended columns were obtained for columns bent in either single or double curvature modes. And then, the effect of end eccentricity ratio was correlated to the equivalent column length. Finally, a simplified design procedure was proposed for eccentrically loaded braced column by transferring it to an equivalent axially loaded pin-ended slender column. The results of the proposed design procedure showed comparable results against the results of the ACI 318-14 code.