Ahmed M. Emad - Academia.edu (original) (raw)

Papers by Ahmed M. Emad

2020 10th Institute of Electrical and Electronics Engineers International Conference on Cyber Technology in Automation, Control, and Intelligent Systems (CYBER), 2020

In this paper, a prosthetic hand precise control method will be used to control the position of t... more In this paper, a prosthetic hand precise control method will be used to control the position of the prosthetic hand finger's motion depending on the sEMG signals as the control command, the PID controller using two different tuning methods genetic algorithm and Ziegler-Nichols. The two methods will be introduced and investigated. In the end, a comparison between the response of the system towards the tuning methods will be established, the system will build and simulate in the Sim-Mechanics environment provided by MATLAB software. All of this work is done as extended work of last paper under the topic ‘An Approach for Accurate Pattern Recognition of Four Hand Gestures Based on sEMG Signals' using its classified motions with accuracy 99.76 as an input command to the controller in order to design one complete prosthetic hand depend on the sEMG signals [1].

Despite the fact that strong routine separation methodologies can give reliable specificity and v... more Despite the fact that strong routine separation methodologies can give reliable specificity and validity at usual working pharmaceuticals concentrations, they may fail at very low concentration levels. This poses considerable challenges for researchers inves-tigating product purity and therapeutic drug monitoring. Sensitivity enhancement pro-cedures are thus required to maximize the performance of separation techniques. Large volume injection, solid phase extraction/solid phase enrichment (SPE/SPEn), pre-, post-, and in-column derivatization, as well as the use of sensitive detection devices are the simplest strategies for improving sensitivity of the separation-based analytical techniques. Large volume injection of samples with online SPE/SPEn coupled with separation techniques increased sensitivity and improved detection as well as quantification limits without affecting peak shape and system performance. Although the primary purpose of derivatization is to improve sensitivity and...

International journal of health sciences

Background: Flap is tissue(s) with its own vascular supply, allowing transfer from one site to an... more Background: Flap is tissue(s) with its own vascular supply, allowing transfer from one site to another. Flaps come in various forms. The purpose of classification is to understand the anatomy and the features that each flap provides; it also allows communication not only with peers but with the patients as well to achieve the common goal of reconstruction. Objective: The aim of this study was to compare the outcome of perforator flaps whether being early in timing in the first 48 hours of trauma or later than 48 hours. Methods: This study was conducted in the period between March 2019 to March 2021 on 40 patients with soft tissue defects in distal third tibia from the outpatient clinic, Emergency department of Plastic Surgery faculty of medicine, Beni-suef University also Surgical and Emergency departments, Agouza Police Authority hospital, Algizah, Egypt. Results: Dehiscence was more frequent in delayed as compared with early group (2 vs. 1 case in both groups respectively); but wi...

The Egyptian Journal of Plastic and Reconstructive Surgery

Background: Nasal tip surgery is one of the most challenging procedures due to its several anatom... more Background: Nasal tip surgery is one of the most challenging procedures due to its several anatomic and pathogenic variations. Droopy nasal tip is a common nasal deformity in which the nasal tip is caudally rotated. The anatomical and pathological basis of droopy nasal tip can be divided into two main categories, extrinsic and intrinsic factors. The aim of our study is to discuss and analyze the different causes of droopy nasal tip and to put the appropriate plan to correct such deformity. Patients and Methods: During the study period, 50 patients of droopy nasal tip were managed. Meticulous pre and intraoperative assessment of the anatomical and pathological causes of nasal tip drooping was done and according to these causes we decided the proper technique for correction of such deformity. Results: Postoperative assessment depended on evaluation of the changes in nasal tip rotation and projection which was done by measurement and comparison of the nasolabial angle and Goode ratio (pre-operative and 1 year post-operative). We found significant postoperative improvement of tip rotation and projection coming to an agreement with the patient satisfaction about the final esthetic outcomes. Conclusion: There is no single technique or procedure through which we can modify or improve nasal tip rotation and projection. So for proper management of this deformity the surgeon must understand the nasal tip support mechanisms with adequate analysis of the underlying causes of such deformity.

2019 IEEE 32nd International Conference on Micro Electro Mechanical Systems (MEMS)

This paper reports the first torsional micro-actuator using a lithium niobate (LiNbO3, 36° Y-cut)... more This paper reports the first torsional micro-actuator using a lithium niobate (LiNbO3, 36° Y-cut) thin film with a record-high figure of merit ($\mathrm{FoM}=\theta_{opt}\cdot \text{mirror dimension}\cdot \mathrm{frequency}$) of 1582 °·mm·kHz at a resonance frequency of 1.268 MHz. The large piezoelectric coefficients and high-quality factors of single crystal LiNbO3 have been exploited to enable high coupling torsional actuation. The fabricated actuator has a mirror size of 22mathrmx40mumathrmm222\mathrm{x}40\ \mu \mathrm{m}^{2}22mathrmx40mumathrmm2, and quality factors of 547 and 1497 in air and vacuum respectively. Moreover, the optical angle can exceed 31circ(thetaopt=4cdotthetamech)31^{\circ}\ (\theta_{opt}= 4\cdot\theta_{mech})31circ(thetaopt=4cdotthetamech) in both air and vacuum, leading to an FoM surpassing state-of-the-art high-frequency scanners. Our demonstration has shown great potential for scanning micro-mirrors, and light detection and ranging systems (LIDAR) applications where frequency scalability, scanning angles, and footprint are the main challenges.

2020 IEEE PES/IAS PowerAfrica, 2020

Organic Materials have been recently used as an alternative for semiconductors in the fabrication... more Organic Materials have been recently used as an alternative for semiconductors in the fabrication of solar cells. The proposed organic materials as an active material are PCPDTBT(Poly[2,1,3-benzothiadiazole-4,7-diyl[4,4-bis(2ethyl-hexyl)-4H-cyclopenta[2,1-b:3,4 b']dithiophene2,6diyl]]), P3HT (Poly(3-hexylthiophene 2,5-diyl)) and PC61BM ([6,6]-Phenyl-C61-butyric acid methyl ester) because of their non-linear optical properties, easy fabrication techniques and low cost. Transparent Conducting Oxides (TCOs) are used in photovoltaics and optical devices for its low electrical resistance. In addition, TCOs do not have many losses for propagated light. The metric for the comparative study between materials is the insertion losses for a 500 nm wavelength source along with these materials. The material that has better performance should have a low insertion loss. In this paper, a study was conducted on the behavior of acceptors concentration, Shockley-Read-Hall (SRH) recombination, I-V, and P-V characteristics on a 1D Si P-N junction. The numerical solutions for insertion losses and 1D Si P-N junction are carried out by LUMERICAL and COMSOL software, respectively. At a depth of 100 nm, PC61BM has a better performance over PCPDTBT and P3HT with Insertion losses (IL) of 3.07 dB and 2.76 dB for TE and TM mode, respectively. For TCOs materials. The behavior of insertion losses on Indium Tin Oxide (ITO), Gallium doped Zinc Oxide (GZO), and Aluminum doped Zinc Oxide (AZO) is traced. At a depth of 100 nm, the insertion losses are minimized by AZO and ITO with a magnitude of 1.91 dB and 1.87 dB for TE mode, respectively, while 1.45 dB for TM mode.

 Network Environment: Networking professional level included configure all CISCO products using ... more  Network Environment: Networking professional level included configure all CISCO products using advanced command line or other brands of networks products, planning, designing, installation, defining, documenting, and enforcing systems standards ( ISO 9001:2008 - IT Policy ).  Systems Management: Install & configure all Microsoft products to operate & managing the work environments as well, for example Windows Server 2012 R2 using any features compatible with work needs like Hyper-V, VMware, Virtual Box or any application’s equivalent providing us managing of systems, also using advanced feature like Active Directory to managing users.  Low Voltage/Current: Operate & function using low current signal with extra low voltage such as: Audiovisual Systems, CCTV, Building Management System, Master Clock System, Access Control, Sound Systems, Security Systems, Data Networks, Telephone systems & UPS.  Database & Programs Configurations: Install and configure the programs or application need to connect it with the database required, working with SAP, Primavera also other programs need to connect it with Oracle or SQL database.  Technical Support: Providing technical support for end users to fix daily IT technical issues such as: Format, Install OS, Printers & Copier Machines Errors, ...etc.

2021 The 5th International Conference on E-Commerce, E-Business and E-Government, 2021

Stock market is the aggregation of purchasers and venders of stocks and it represents ownership c... more Stock market is the aggregation of purchasers and venders of stocks and it represents ownership claims on businesses. The purpose of predicting stock market is to anticipate the price value and direction of stock. Higher profits will investors can made by higher accuracy prediction are gotten and here is one of the most challenging issues is predicting how the stock market will move. In this paper we are going to predict the value of the close price for the stock market and that by using Long-short term memory (LSTM) neural network and also predict the direction of the stock market by using neural network (ANN) and after that will compare the results of performance that we obtained with other papers used same dataset.

Nanomaterials for Spectroscopic Applications, 2021

Dental Science Updates, 2021

ABSTRACTAim: To evaluate the effect of intra-canal cryotherapy on interleukin-1βand interleukin-1... more ABSTRACTAim: To evaluate the effect of intra-canal cryotherapy on interleukin-1βand interleukin-10 expression in teeth with symptomatic apical periodontitis.Methodology: Forty-eight single rooted teeth in patients with symptomatic apical periodontitiswere randomly divided into 4 groups according to the irrigation protocol.Group I (control); 5% sodium hypochlorite at room temperature. Group II; 5% coldsodium hypochlorite (2-5°C). Group III; final rinse with 20 mL of 5% cold sodiumhypochlorite (2-5°C) for 5 minutes. Group IV; final rinse with 20 mL of cold saline (2-5°C) for 5 minutes. Paper point passing 2 mm beyond the apex was used to collect periapicalfluid before, immediately after mechanical instrumentation and after one week tocharacterize the mRNA expression of IL-1β and Il-10 using real-time polymerase chainreaction (PCR). Statistical analysis was performed using one-way ANOVA to comparebetween all groups. Results: Our results revealed statistically significant (at P≤ 0.05)do...

2020 2nd Novel Intelligent and Leading Emerging Sciences Conference (NILES), 2020

In this paper, we introduce active material for an organic solar cell with a modified composition... more In this paper, we introduce active material for an organic solar cell with a modified composition. A combination of P3HT: PCBM with parallel vertical LiF cylinders formulate the active material structure. The collection efficiency in the active material reaches 92.2%. The operating wavelength where the maximum collection efficiency occurs is adjusted and matched with the wavelength where the maximum irradiance of the solar spectrum occurs. The absorption per unit volume of the new structure is 80.4 µm−3 while the blank structure is 75.07 µm−3. The net absorption magnitude for the required structure is 32.09. The LiF is considered a suitable material for the vertical cylinders in the proposed structure. At a depth of 95 nm and operating wavelength 500 nm, for TE mode, LiF has the highest insertion losses with 0.7 dB. However, ITO and ZnO possess 0.35 dB and 0.49 dB, respectively. For TM mode, LiF has the lowest insertion losses at the same depth with 0.7 dB, while ZnO possesses 0.49 ...

Saudi Endodontic Journal, 2021

Introduction: Cryotherapy is a new form of treatment, in which the body is exposed to cold temper... more Introduction: Cryotherapy is a new form of treatment, in which the body is exposed to cold temperatures. Hence, this study was aimed to evaluate the effect of intracanal cryotherapy on postendodontic pain and interleukin-6 (IL-6) expression in teeth with symptomatic apical periodontitis. Materials and Methods: Forty-eight single-rooted teeth in patients with symptomatic apical periodontitis were randomly divided into four groups based on the irrigation protocol. Group I (control): 5% sodium hypochlorite (NaOCl) at room temperature (RT) was used during instrumentation and final rinse. Group II: 5% cold NaOCl (2°C–5°C) was used during the root canal procedure. Group III: 5% NaOCl at RT during instrumentation, while the final rinse was 20 mL of 5% cold NaOCl (2°C–5°C). Group IV: 5% NaOCl at RT during instrumentation followed by 20 mL of cold saline (2°C–5°C). Postoperative pain score was recorded using a modified visual analog scale at 12, 24, 48, and 72 h and after 1 week. Paper point...

2000 Solid-State, Actuators, and Microsystems Workshop Technical Digest, 2000

Journal of Circuits, Systems and Computers, 2019

Transaction-Level Modeling (TLM) has been widely used in system-level design in the past few year... more Transaction-Level Modeling (TLM) has been widely used in system-level design in the past few years. Simulation speed of Virtual Platforms (VPs) depends mainly on the transactions which are initiated by the Programmer’s View (PV) models of the VP devices. PV models are required to run at highest simulation speed. Data bus width as a hardware (HW) parameter should not reduce simulation speed of the modeled transactions. Furthermore, HW-related parameters should only be accounted for when considering timing of the models. A fast SystemC-TLM model is developed for the widely used ARM PrimeCell PL080 DMAC IP. The performance of the proposed model is validated against a developed RTL model for the same device. The effect of the transactions granularity on simulation speed is determined. Different programmed transfers are simulated and compared with open-source Quick Emulator (QEMU)-based models. The developed model is compared with the developed RTL, the open-source QEMU model, and the ex...

Journal of Pediatric Hematology/Oncology, 2019

Purpose: Infantile hepatic hemangioendothelioma (IHHE) is the most common hepatic vascular tumor ... more Purpose: Infantile hepatic hemangioendothelioma (IHHE) is the most common hepatic vascular tumor in children. We report on the treatment outcome of our large single-center experience of patients with IHHE over a 9-year period. Materials and Methods: A retrospective analysis of all IHHE patients treated at the Children Cancer Hospital Egypt from April 2008 through April 2017. Results: In total, 28 patients (18 females, 10 males) were diagnosed with IHHE with a median age at diagnosis of 3 months. The lesions were multifocal (n = 12), focal (n = 10), and diffuse (n = 6). Six (21.4%) patients initially had low T3 and T4. Eleven patients did not receive any treatment, whereas 1 patient underwent resectional surgery. Sixteen patients received drug treatment, 9 of whom responded well to first-line propranolol/prednisolone, whereas 7 patients needed salvage treatment. Twenty-five patients are alive, whereas 3 patients have died. Conclusions: Overall, patients with IHHE do well, a significant percentage of whom do not require drug therapy, particularly for those with small focal lesions. In patients with multifocal/diffuse disease, there is a high incidence of low T3 and T4 and while some of these patients did well without additional therapy, those with rapidly progressive lesions during treatment may do poorly.

2016 IEEE 59th International Midwest Symposium on Circuits and Systems (MWSCAS), 2016

In this paper, the utilization of stretching strain that exists in clamped-clamped beam structure... more In this paper, the utilization of stretching strain that exists in clamped-clamped beam structures is investigated as a main source for energy harvesting from vibrations using a piezoelectric material. This technique eliminates the need for a substrate material, and reduces the electrodes configuration complexity, thus simplifies the fabrication process. This structure exhibits nonlinear dynamics under certain conditions, which is modeled as a single degree of freedom (SDoF) electromechanical system. The proposed model accuracy is then verified using finite element modeling (FEM). The results show a highly nonlinear system with a “Duffing” frequency response that can be used to design an ultra-wide bandwidth energy harvesting system suitable for practical applications. Using this technique a design of 9.9mm3 energy harvester is proposed using polyvinylidene fluoride (PVDF) that can generate up to 4μW from vibrations of 0.5g at 70Hz.

電気学会研究会資料 Pse 電力系統技術研究会, Mar 5, 2012

2015 IEEE International Conference on Electronics, Circuits, and Systems (ICECS), 2015

Lead Zirconate Titnate, or PZT, has always been favored over Aluminum Nitride, AlN, in Energy Har... more Lead Zirconate Titnate, or PZT, has always been favored over Aluminum Nitride, AlN, in Energy Harvesting applications due to its superior coupling coefficient, d31. However, the use of PZT in some applications, such as medical implants, is not possible due to its toxic nature as it contains Lead. In this paper, a comparison between the performances of PZT and AlN harvesters is held by utilizing the same uniform cantilever structure. The results of this comparison show that PZT has only 4 times the output power of AlN, and 33% lower resonance frequency. To further increase the output power of the AlN harvester and drive its resonance frequency down to perform PZT-like, a modification to the beam structure is proposed. The modification is to taper the cross-section of the beam linearly. The new structure has the same exact area as the uniform cantilever beam. The FEM simulation results show that the output power of the AlN harvester with the modified structure is nearly the same as the uniform PZT structure, around 1.3 μW for an input acceleration of 0.5g and the resonance frequency is even 35% lower. The gap in performance between PZT and AlN is nearly eliminated using the proposed structure without requiring extra area.

Fetal diagnosis and therapy, Jan 13, 2015

Analysis of DNA from small numbers of cells, such as fetal cells in maternal blood, is a major li... more Analysis of DNA from small numbers of cells, such as fetal cells in maternal blood, is a major limiting factor for their use in clinical applications. Traditional methods of single-cells whole genome amplification (SCs-WGA) and accurate analysis have been challenging to date. Our purpose was to assess the feasibility of using a few fetal cells to determine fetal sex and major chromosomal abnormalities by quantitative fluorescent polymerase chain reaction (QF-PCR). Cultured cells from 26 amniotic fluid samples were used for standard DNA extraction and recovery of 5 fetal cells by laser-capture microdissection. SCs-WGA was performed using the DNA from the microdissected cells. PCR amplification of short tandem repeats specific for chromosomes 13, 18, 21, X and Y was performed on extracted and amplified DNA. Allele dosage and sexing were quantitatively analyzed following separation by capillary electrophoresis. Microsatellite QF-PCR analysis showed high concordance in chromosomal copy ...