Ahmed Yousry - Academia.edu (original) (raw)

Papers by Ahmed Yousry

Journal of Urban Research

Chemical Engineering Research and Design

Journal of Urban Research, 2005

Egyptian Journal of Radiology and Nuclear Medicine, 2022

Background The indulgence of artificial intelligence (AI) has been considered recently in the wor... more Background The indulgence of artificial intelligence (AI) has been considered recently in the work up for the detection and diagnosis of breast cancer through algorithms that could supply diagnosis as the radiologist do. The algorithm learns from a supervised and continuous input of large and new data sets unlike the standard programming, which requires clear step-by-step instructions. The aim of this study is to assess the ability of AI scanned mammograms to aid the ultrasound in the discrimination between phyllodes tumors and fibro-adenomas. Results This is a retrospective analysis included 374 proven phyllodes tumors (PT) and fibro-adenomas (FA). Digital mammogram and breast ultrasound was performed for all the cases and each breast was given a “Breast Imaging Reporting and Data System” (BI-RADS) score. Included mammograms were scanned by AI with resultant a qualitative heatmap and a quantitative abnormality scoring of suspicion percentage. The study included 164 PT (43.9%) and 2...

Journal of Urban Research, 2016

Journal of Urban Research, 2009

Int. Arab. J. e Technol., 2018

Despite the quickly expanding utilization of Master cards and other electronic types of payment, ... more Despite the quickly expanding utilization of Master cards and other electronic types of payment, money is still broadly utilized for ordinary exchanges because of its convenience. However, the visually impaired people may suffer from knowing each currency paper apart. Currency Recognition Systems (CRS) can be used to help blind and visually impaired people who suffer from monetary transactions. In this paper, a Currency Recognition System based on Oriented FAST and rotated BRIEF (ORB) algorithm is proposed. The ORB is based on the FAST detector and the visual descriptor BRIEF (Binary Robust Independent Elementary Features). Its aim is to provide a fast and efficient alternative to Local ScaleInvariant Features (SIFT). The proposed system is applied to Egyptian paper currencies including six kinds of currency papers. Initially, some pre-processing operations are performed on a given currency paper input image. Then, important ROI is extracted from the background. The ORB Algorithm is...

The objective of this report is to provide a general overview of the current state of urban plann... more The objective of this report is to provide a general overview of the current state of urban planning, energy systems, water and waste management, transportation planning and raising general awareness. One objective is also to provide some general information about what the EcoCity concept means in the Egyptian context. Some case examples are given in order to give an idea of the practical conditions on the ground. An EcoCity essentially has high ecological quality, but at the same time it is technologically sophisticated and modern. The attempts to build an EcoCity so far have been based on optimization of different sectors or technologies, and thus they are a compromise between the high-level targets and the present level of design. However, there is not just one EcoCity concept but a variety of possibilities that need to be adjusted to fit the local context, local culture and local economic realities. This is the way to achieve a possible solution with regard to the local resources, but at the same time to meet the high goals set for an EcoCity. High-tech solutions are one way to the EcoCity, but they are not the only goal of an EcoCity. The main elements of an EcoCity are a dense city structure, clean energy production, minimal energy consumption, sustainable transport solutions, ecological water and waste solutions and the inclusion of social aspects. In Egypt the biggest challenges in terms of EcoCities concern transportation. Bigger cities have big problems with too many private cars and the lack of functioning public transportation systems. Water resources are scarce in Egypt, and they have therefore to be given special focus when planning sustainable city structures. There is a high level of know-how about water handling systems. The main challenges are in finding investments for the solutions. As regards energy, there is a major saving potential in terms of electricity usage. Regarding renewable sources, the biggest potential is in solar energy. To achieve sustainable cities, focus must also be put on awareness-raising activities and on developing governance structure.

Cities, like human begins, have the common nature of continuous change. Being called growth, devi... more Cities, like human begins, have the common nature of continuous change. Being called growth, deviation or expansions reflects the same sense ensuring that a city is never in a stagnant state. This was the main reason behind having the government of Egypt represented in the Ministry of Housing, Utilities and Urban Development and specifically the New Urban communities Authority- prepare updated periodical strategic plans for the new Egyptian cities to feedback cities problems, potentials and constrain defining new visions and objectives within the comprehensive plan for the country. When the studies for the updated strategic plan for 6th of October city started in 2007, obvious deviations of its executive plans from the original city’s goals and objectives were noticed. These unplanned extensions resulted in random urban growth and land uses changes that lead to the lack of a comprehensive city vision and the creation of an urban environment that lacks identity and cohesiveness with ...

Egyptian Journal of Chemistry, 2021

Journal of Cardiovascular Imaging, 2021

BACKGROUND: Diastolic function has been reported to be impaired in many patients with coronary sl... more BACKGROUND: Diastolic function has been reported to be impaired in many patients with coronary slow flow phenomenon (CSFP). CSFP has broad spectrum of clinical presentations, including non-ST elevation myocardial infarction (NSTEMI). We sought to study the shortterm evolution of diastolic function in CSFP patients presenting with NSTEMI. METHODS: This study included 92 patients with CSFP and acute NSTEMI. Conventional echocardiography Doppler imaging and tissue Doppler echocardiography imaging were used to evaluate diastolic function during index NSTEMI and after 3 months. RESULTS: Mean age of study patients was 45.7 ± 6.8 years. The prevalence of diastolic dysfunction (DD) at baseline was 69 patients (75%) and 28 patients (30.4%) at 3 months, p < 0.001. Various diastolic function indices showed significant improvement from baseline to 3 months follow-up. E/Em was 17.32 ± 3.41 at baseline compared to 12.41 ± 5.58 at 3 months, p = 0.039. Septal e′ velocity was 5.67 ± 4.56 cm/s at baseline compared to 7.78 ± 3.22 cm/s at 3 months, p = 0.023. Medications used were not significantly different between those with improved versus unimproved DD. CONCLUSIONS: Diastolic function seems to improve over short-term follow-up in patients with CSFP presenting with NSTEMI. This could reflect a transient worsening during acute NSTEMI.

QJM: An International Journal of Medicine, 2021

Background Pituitary adenomas (PAs) are the second most common brain tumors, 10% to 20% of all pr... more Background Pituitary adenomas (PAs) are the second most common brain tumors, 10% to 20% of all primary brain tumors. Transsphenoidal approach is now the gold standard for treatment of PAs either microscopic or endoscopic. Aim of the Work to analyze the collective outcomes from studies comparing the microscopic transsphenoidal surgery (MTS) with the endoscopic transsphenoidal surgery (ETS) regarding gross total resection (GTR) and postoperative cerebrospinal fluid (CSF) leak. Patients and Methods we searched PubMed, Google scholar search engine, Cochrane database of systematic reviews, EMBASE and science Direct, using the following keywords “Pituitary adenoma/tumor, endoscopy or endoscopic, microscopy or microscopic, gross total/subtotal/near total/radicular resection/excision, hypophysectomy, debulking, CSF leak/leakage ". The mentioned databases were searched for studies published during period from the 1st of Jan 2015 to 31 Aug. 2020. Results Total number of patients in inclu...

Ain Shams Medical Journal, 2020

Background: Management of bone defects is controversial, between grafting, acute shortening, and ... more Background: Management of bone defects is controversial, between grafting, acute shortening, and up to amputation and disarticulation in extensive defects. This study is a comparative study between 2 modalities for management of bone defects to reveal advantages and disadvantages of each modality. Aim of the work: The aim of this work is to assess and compare results of membrane induced osteogenesis and bone transport in extensive bone defects of the lower limb. Patients and methods: We prospectively studied 40 patients (29 males and 11 females) with lower limb bony defects. They were divided into two groups according to the method of reconstruction using either Masquelet technique in 20 patients (group A) or bone transport in the other 20 patients (group B). The mean age of the patients was 35.٢ years in group A and was 35.2 years in group B. diagnosis was infected non union (20 cases: 10 in group A &10 in group B) and posttraumatic and non infective defects (20 cases: 10 in group A &10 in group B) .The most common anatomical site was the tibia (24 cases:9 in group A &15 in group B).. Patients were reviewed every 3 monthly for a minimum period of 1 year. Regular outpatient follow-up was done with a mean period of 18.35±5.58 months in group A and 18.25±3.95 months in group B. Results: In cases of group A (Masquelet group) 12 cases showed complete union, and the other 8 cases showed no evidence of union (all from infected group). While in case of group B (bone transport group) all cases showed complete union Conclusion: bone transport technique is more reliable method with more expectable results for healing and infection eradication. Up to our study, Masquelet technique can be used in the following indications: small, metaphyseal and posttraumatic or non infective defects

International Journal of Intelligent Engineering and Systems, 2020

No doubt, Visually Impaired (VI) have trouble signing documents. They cannot identify their signa... more No doubt, Visually Impaired (VI) have trouble signing documents. They cannot identify their signatures and have their identification verified. Hence, some people may impersonate their identity. They may imitate their signatures in formal documents like contracts, money checks, and other vital documents, mainly in the governmental institutions. No clarified method can maintain these signatures. This paper presents a new prototype for securing VI people's signature using encryption techniques and data hiding methods. The proposed prototype uses the Least Significant Bit (LSB) algorithm for hiding some information, including the name of VI, the date, and the time of the signature. These data are encrypted using an improved, chaotic algorithm with a linear feedback shift register approach. Moreover, a QR code for each VI person is created and associated with the document. Both the signature and the QR code can be used to secure and validate the VI signature for a given document. A real signature dataset is constructed for evaluating the proposed prototype. The experimental results with respect to the real dataset and the Spanish signature dataset (MCYT-100) proved that the superiority of the proposed prototype.

International Journal of Advanced Research, 2018

Background:Bariatric surgery proved to be the only successful treatment option leading to long-te... more Background:Bariatric surgery proved to be the only successful treatment option leading to long-term weight loss with improvement of obesity related comorbidities. The Laparoscopic Sleeve Gastrectomy (LSG) is now one of the most popular bariatric procedure worldwide with rising prevalence over last decade, while the Mini Gastric Bypass (MGB) is now gaining some popularity as a relatively new bariatric procedure Methods:The study involved forty patients; twenty of them had Laparoscopic Sleeve Gastrectomy (LSG), and twenty of them had Laparoscopic Mini Gastric Bypass (MGB). The patients were selected according to National Institute of Health (NIH) guidelines. All procedures were performed by the same team of experienced bariatric surgeons. all the patients had a one-year period of follow up after surgery and were evaluated for weight loss, morbidity (early, and late), impact on obesity associated diseases and effect on quality of life (QoL). Results:The two groups were matched considering the demographic data. Operative time was significantly longer in MGB group (P = 0.001), with mean operative time in MGB group was 74.75, while in LSG group was 53.25 min. One patient (5%) from LSG group developed stenosis and was managed by endoscopic balloon dilatation. Mean excess weight loss % after one year was 66.99% (± 1.739%) for LSG group and 67.76% (± 1.813%) for MGB group. The QoL after one year was varied between good and very good in both groups, with 70% of LSG group lie in very good category, and 75% of MGB group lie in the very good category. Conclusion:Both studied laparoscopic techniques; LSG and MGB were safe and effective, with similar results as regards significant weight loss and improvement of obesity-associated medical comorbidities and quality of life, with acceptable morbidity.

Drug Design, Development and Therapy, 2016

Background: This is the second and final report for our study designed to compare two generic sof... more Background: This is the second and final report for our study designed to compare two generic sofosbuvir products for the degree and speed of virologic response to a dual anti-hepatitis C virus (HCV) treatment protocol. We aimed to test the applicability of the early virus response kinetics and the very rapid virologic response (vRVR) rate as quick outcome measures for accelerated comparative efficacy studies and as a foundation for a personalized response-guided therapy. Methods: Fifty eligible chronic HCV patients were randomized to either one of two generic sofosbuvir products (Gratisovir or Grateziano) at a daily dose of one 400 mg tablet plus a weight-based ribavirin dose. Data were compared between the groups for early virus response kinetics and vRVR rates in relation to the rates of final sustained virologic response at week 12 posttreatment (SVR12). Results: The Log 10 transformed virus load (Log polymerase chain reaction) curves showed fairly similar rapid decline during the first 2 weeks, with no significant difference between the groups at four analysis points throughout the study by repeated-measures factorial analysis of variance test (P=0.48). The SVR12 rates were 96% (95% confidence interval, 79.6%-99.9%) in Gratisovir group (24/25) and 95.7% (95% confidence interval, 78%-99.9%) in Grateziano group (22/23). There was no statistically significant difference found by exact test (P.0.999). There was a significant association between the vRVR and the SVR12, with 100% positive predictive value (38/38 of those who had vRVR, achieved a final SVR12) and 82.6% sensitivity (among the total 46 with SVR12, 38 were having vRVR). Conclusion: We can conclude from our study that the early HCV response kinetics and the vRVR rates could be used as sensitive quick markers for efficacy (with a very high positive predictive value for SVR12), based on our accelerated comparative efficacy research model. This might open the way for new models of accelerated equivalence efficacy studies along with the bioequivalence kinetics studies to test a generic drug against a reference. Also, the early response kinetics and the vRVR might be used as qualifiers for a personalized course of treatment. This could shorten unnecessarily long treatment courses in rapid responders and might help to avoid relapses in slow responders.

The Egyptian Rheumatologist, 2016

Background: Systemic sclerosis (SSc) is a rare multi-system autoimmune disease characterized by v... more Background: Systemic sclerosis (SSc) is a rare multi-system autoimmune disease characterized by vascular abnormalities with an increased prevalence of macrovascular disease. Aim of the work: To evaluate macro-vascular disease (atherosclerosis) in SSc patients and determine its relation to the disease activity and severity. Patients and methods: Twenty-five SSc patients and 20 matched controls were included. The modified Rodnan skin score (mRss) and disease severity by Medsger's severity score were assessed. Carotid intima-media thickness (IMT) and flow mediated vasodilatation (FMD) of the brachial artery were measured. Traditional vascular risk factors were assessed by thorough history taking and laboratory investigations. Results: The age of the patients ranged from 15 to 60 years and they were 22 females and 3 males. 15 had limited and 10 diffuse cutaneous SSc. All SSc patients had an increased IMT (1.24 ± 0.29 mm) which was normal in the control subjects (0.77 ± 0.09 mm) (p < 0.0001). SSc patients had significantly lower HDL, thickened IMT and lower FMD than controls (p = 0.005, p < 0.0001 and p < 0.0001 respectively). The younger age of disease onset was significantly associated with more FMD impairment (r = À0.4, p = 0.04) and Medsger's severity score (r = 0.5, p = 0.009). The mRss and Medsger's severity score significantly correlated with the IMT (r = 0.84, p = 0.01 and r = 0.56, p = 0.003 respectively). A significant negative correlation was found between FMD and IMT (r = À0.77, p < 0.0001). Medsger's severity score significantly correlated with FMD (r = À0.44, p = 0.02).

Drug Design, Development and Therapy, 2015

Background: We aimed in this interim report to compare two registered generic sofosbuvir products... more Background: We aimed in this interim report to compare two registered generic sofosbuvir products for the degree and speed of virologic response to a dual antiviral treatment protocol within the first 2 weeks of treatment. Methods: Data collected during the period of this interim report from the first 25 patients randomized to either one of two generic sofosbuvir products (Grateziano or Gratisovir) at a daily dose of one 400 mg tablet plus a weight-based ribavirin dose were analyzed for both the degree and speed of virus load reduction at the end of 1 and 2 weeks from starting treatment. Results: The baseline Log10 transformed virus load (Log polymerase chain reaction) showed a fairly similar marked and significant reduction in both groups by more than 4 and 5 Logs at the end of week 1 and 2 of starting treatment, respectively. The differences between the two treatment groups at both analysis points were not statistically significant (P.0.05) by repeated measures factorial analysis of variance test. The differences in proportions of patients with ultra-rapid virologic response at the end of week 1 and very-rapid virologic response at the end of week 2 in both groups were also not statistically significant (P.0.05). Conclusion: We can conclude from this interim report that the two generic products Gratisovir and Grateziano are almost equally fast and efficacious in reducing the hepatitis C virus load in our study setting.

Building orientation Facing north Number of storeys 3 Total floor area 750 m Wall material Red br... more Building orientation Facing north Number of storeys 3 Total floor area 750 m Wall material Red brick Wall thickness 20 cm, Finished roof Uninsulated Roof material Asphalt shingles Slab Reinforced concrete, uninsulated Window area 15% of wall area Windows Single pane, clear glass, wood frame Overhangs None Air leakage 15 ACH50 Natural ventilation Year-round Space conditioning Central AC, SEER 8 Space heating Gas, 78% AFUE Cooling and heating setpoints 26 ° (cooling), 20 ° (heating) Water heater Gas standard Lighting 34% CFL hardwired, 34% CFL plugin Refrigerator Standard Cooking range Gas, conventional Clothes washer Standard Clothes dryer Standard Public Service (PS) An Environmentally Responsible Pages 82 p. + app. 6 p.

IRVS stands for "Intelligent Robot Vision System" which is a hardware system with a cam... more IRVS stands for "Intelligent Robot Vision System" which is a hardware system with a camera mounted on its top. It can move intelligently in a given environment trying to find a certain goal of interest using this goal's relations with other objects in the environment.