ON AMR-ALGEBRA

AMIN, AMR K. The Korean Society for Computational and Applied M 2022 Journal of applied mathematics & informatics Vol.40 No.5-6

The main objective of this paper is to introduce the notion of AMR-algebra and its generalization, and to compare them with other algebras such as BCK, BCI, BCH, · · ·, etc. We show moreover that the K-part of AMR-algebra is an abelian group, and the weak AMR-algebra is also an abelian group and generalizes many known algebras like BCI, BCH, and G.

Optimal location of a single through-bolt for efficient strengthening of CHS K-joints

Amr Fayed,Ali Hammad,Amr Shaat 국제구조공학회 2024 Structural Engineering and Mechanics, An Int'l Jou Vol.89 No.1

Strengthening of hollow structural sections using through-bolts is a cost-effective and straightforward approach. It’s a versatile method that can be applied during both design and service phases, serving as a non-disruptive and budget-friendly retrofitting solution. Existing research on axially loaded hollow sections T-joints has demonstrated that this technique can amplify the joint strength by 50%, where single bolt could enhance the strength of the joint by 35%. However, there's a gap in understanding their use for K-joints. As the behavior of K-joints is more complex, and they are widely existent in structures, this study aims to bridge that gap by conducting comprehensive parametric study using finite element analysis. Numerical investigation was conducted to evaluate the effect of through bolts on K-joints focusing on using single through bolt to achieve most of the strengthening effect. A full-scale parametric model was developed to investigate the effect of various geometric parameters of the joint. This study concluded the existence of optimal bolt location to achieve the highest strength gain for the joint. Moreover, a rigorous statistical analysis was conducted on the data to propose design equations to predict optimal bolt location and the corresponding strength gain implementing the verified by finite element models.

Endotracheal intubation in patients undergoing open abdominal surgery in the lateral position: a comparison between the intubating video stylet and fiberoptic intubating bronchoscopy

Wahdan Amr Samir,El-Refai Nesrine Abdel rahman,Omar Sohaila Hussien,Abdel Moneem Shady Amr,Mohamed Mennatallah Magdi,Hussien Mohamed Mahmoud 대한마취통증의학회 2021 Korean Journal of Anesthesiology Vol.74 No.3

Background: Some situations compel anesthetists to execute endotracheal intubation in the lateral position. We compared elective endotracheal intubation in the lateral decubitus position using the video stylet (VS) device with the fiberoptic (FO) bronchoscope device in patients undergoing abdominal surgery.Methods: Overall, 50 patients were enrolled in this prospective, randomized study. They were randomly classified into the VS intubation or FO intubating bronchoscope group. After anesthesia induction, patients were placed in the lateral decubitus position, and a single investigator well-versed with the use of the VS and FO bronchoscope performed the intubation. The primary outcome was the time taken for intubation. Secondary outcomes included the intubation success rate, hemodynamic response at specific time points and perioperative complications.Results: The average time taken for intubation was significantly lesser in the VS group than in the FO group, with values of 39.5 ± 10.0 and 75.6 ± 16.2 s, respectively (P < 0.001). Incidences of a successful first attempt of intubation in the VS and FO groups were 88% and 100%, respectively, showing no significant difference. There was a negligible difference in complications between the groups, except sore throat, which showed a higher incidence in the VS group than in the FO group (P = 0.002).Conclusions: In laterally positioned patients, elective endotracheal intubation with VS provides less intubation time; however, its use is accompanied by a significant increase in the hemodynamic response after intubation and an increased incidence of sore throat.

Multi-Axial Full-Scale Sub-Structured Testing and Simulation Facility at the University of Illinois at Urbana-Champaign

Amr Elnashai,Sung Jig Kim(김승직) 한국콘크리트학회 2008 콘크리트학회지 Vol.20 No.6

Advanced Oxidation Processes a Powerful Option of Emerging Contaminant Treatment

Amr Hussein Mady,Woo Kyoung Kim 한국에너지기후변화학회 2023 한국에너지기후변화학회 학술대회 Vol.2023 No.11

Study on the Design and Analysis of a 4-DOF Robot for Trunk Rehabilitation

Amre Eizad(에이자드 아믈),Sanghun Pyo(표상훈),Geonhyup Lee(이건협),Sung-Ki Lyu(류성기),Jungwon Yoon(윤정원) 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.7

This paper presents the development of a robotic system for rehabilitation of the trunk’s ability to maintain postural control under different balance conditions. The system, developed with extensive input from rehabilitation and biomedical engineering experts, consists of a seat mounted on a robotic mechanism capable of moving it with four degrees of freedom (3 rotational and 1 translational). The seat surface has built in instrumentation to gauge the movements of the user’s center of pressure (COP) and it can be moved either to track the movements of the COP or according to operator given commands. The system allows two types of leg support. A ground mounted footrest allows participation of legs in postural control while a seat connected footrest constrains the leg movement and limits their involvement in postural control. The design evolution over several prototypes is presented and computer aided structural analysis is used to determine the feasibility of the designed components. The system is pilot tested by a stroke patient and is determined to have potential for use as a trunk rehabilitation tool. Future works involve more detailed studies to evaluate the effects of using this system and to determine its efficacy as a rehabilitation tool.

Study on Development of Portable Incubator

Amre Eizad(에이자드 아믈),Falak Zahra(파락 자흐라),Hamza Alam(함자 알람),Hassan Tahir(하산 따히르),Afrasiab Khan Bangash(아프라시압 칸 반가시),Sung-Ki Lyu(류성기) 한국기계가공학회 2019 한국기계가공학회지 Vol.18 No.9

Preterm children require a controlled environment that is as close as possible to that inside the womb. Incubators are well equipped to fulfill this requirement; however, they are cumbersome and expensive, thereby restricting their portability and availability in less developed and rural areas. This research comprises the development and system validation of a portable incubator. The system consists of a collapsible baby enclosure that can be stowed inside the system base when not in use. The enclosure is made from acrylic such that it is easy to clean and allows unhindered visual observation of the occupant while being robust enough to withstand transit conditions. The system can be powered either by a mains supply or a 12-VDC automobile power supply. Additionally, it has an onboard battery to ensure a continuous supply during transit. A Peltier plate controlled using a microcontroller ensures the desired enclosure temperature irrespective of the ambient temperature. Built-in sensor probes can measure the skin temperature, pulse rate, blood oxygenation level, and ECG of the infant and display them on the system screen. The system function is validated by testing its peak power consumption and the heating and cooling performances of the environment control system.

Dynamic analysis of porous functionally graded layered deep beams with viscoelastic core

Amr Assie,Şeref D. Akbaş,Abdallah M. Kabeel,Alaa A. Abdelrahman,Mohamed A Eltaher 국제구조공학회 2022 Steel and Composite Structures, An International J Vol.43 No.1

In this study, the dynamic behavior of functionally graded layered deep beams with viscoelastic core is investigated including the porosity effect. The material properties of functionally graded layers are assumed to vary continuously through thickness direction according to the power-law function. To investigate porosity effect in functionally graded layers, three different distribution models are considered. The viscoelastically cored deep beam is exposed to harmonic sinusoidal load. The composite beam is modeled based on plane stress assumption. The dynamic equations of motion of the composite beam are derived based on the Hamilton principle. Within the framework of the finite element method (FEM), 2D twelve –node plane element is exploited to discretize the space domain. The discretized finite element model is solved using the Newmark average acceleration technique. The validity of the developed procedure is demonstrated by comparing the obtained results and good agreement is detected. Parametric studies are conducted to demonstrate the applicability of the developed methodology to study and analyze the dynamic response of viscoelastically cored porous functionally graded deep beams. Effects of viscoelastic parameter, porosity parameter, graduation index on the dynamic behavior of porous functionally graded deep beams with viscoelastic core are investigated and discussed. Material damping and porosity have a significant effect on the forced vibration response under harmonic excitation force. Increasing the material viscosity parameters results in decreasing the vibrational amplitudes and increasing the vibration time period due to increasing damping effect. Obtained results are supportive for the design and manufacturing of such type of composite beam structures.

Development of UAV Teleoperation Virtual Environment Based-on GSM Networks and Real Weather Effects

Amr AbdElHamid,Peng Zong 한국항공우주학회 2015 International Journal of Aeronautical and Space Sc Vol.16 No.3

Future Ground Control Stations (GCSs) for Unmanned Aerial Vehicles (UAVs) teleoperation targets better situational awareness by providing extra motion cues to stimulate the vestibular system. This paper proposes a new virtual environment for long range Unmanned Aerial Vehicle (UAV) control via Non-Line-of-Sight (NLoS) communications, which is based on motion platforms. It generates motion cues for the teleoperator for extra sensory stimulation to enhance the guidance performance. The proposed environment employs the distributed component simulation over GSM network as a simulation platform. GSM communications are utilized as a multi-hop communication network, which is similar to global satellite communications. It considers a UAV mathematical model and wind turbulence effects to simulate a realistic UAV dynamics. Moreover, the proposed virtual environment simulates a Multiple Axis Rotating Device (MARD) as Human Machine Interface (HMI) device to provide a complete delay analysis. The demonstrated measurements cover Graphical User Interface (GUI) capabilities, NLoS GSM communications delay, MARD performance, and different software workload. The proposed virtual environment succeeded to provide visual and vestibular feedbacks for teleoperators via GSM networks. The overall system performance is acceptable relative to other Line-of-Sight (LoS) systems, which promises a good potential for future long range, medium altitude UAV teleoperation researches.

Performance Enhancement for Device-to-Device Under laying Cellular Network Using Coalition Formation Game

Amr Radwan,김훈 한국멀티미디어학회 2016 멀티미디어학회논문지 Vol.19 No.8

Interference in device-to-device (D2D) communication underlaying cellular network needs to be elaborately investigated because of channel sharing. The objective is to improve the quality of D2D communications while maintaining high performance for cellular users. In this paper, we solve the above problem by jointly considering channel allocation and power control using coalition formation game. Our cooperative game theoric approach allows to enhance network-wide performance. We design a merge-and-split algorithm to deal with the complexity of the combinatorial structure in coalition formation problem. The analytical and numerical results show that our algorithm converges to a stable point which achieves high network performance