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Free vibration analysis of FG plates under thermal environment via a simple 4-unknown HSDT
Amina Attia,Amina Tahar Berrabah,Abdelmoumen Anis Bousahla,Fouad Bourada,Abdelouahed Tounsi,S. R. Mahmoud 국제구조공학회 2021 Steel and Composite Structures, An International J Vol.41 No.6
A 4-unknown shear deformation theory is applied to investigate the vibration of functionally graded plates under thermal environment. The plate is fabricated from a functionally graded material mixed of ceramic and metal with continuously varying material properties through the plate thickness. Three types of thermal loadings, uniform, linear and nonlinear temperature rises along the plate thickness are taken into account. The present theory contains four unknown functions as against five or more in other higher order shear deformation theories. The through-the-thickness distributions of transverse shear stresses of the plate are considered to vary parabolically and vanish at upper and lower surfaces. The present model does not require any problem dependent shear correction factor. Analytical solutions for the free vibration analysis are derived based on Fourier series that satisfy the boundary conditions (Navier's method). Benchmark solutions are firstly considered to evaluate the accuracy of the proposed model. Comparisons with the solutions available in literature revealed the good capabilities of the present model for the simulations of vibration responses of FG plates. Some parametric studies are carried out for the frequency analysis by varying the volume fraction profile and the temperature distribution across the plate thickness.
Analysis of MANET's Routing Protocols, Security Attacks and Detection Techniques- A Review
Amina Yaqoob,Alma Shamas,Jawwad Ibrahim International Journal of Computer ScienceNetwork S 2024 International journal of computer science and netw Vol.24 No.6
Mobile Ad hoc Network is a network of multiple wireless nodes which communicate and exchange information together without any fixed and centralized infrastructure. The core objective for the development of MANET is to provide movability, portability and extensibility. Due to infrastructure less network topology of the network changes frequently this causes many challenges for designing routing algorithms. Many routing protocols for MANET have been suggested for last few years and research is still going on. In this paper we review three main routing protocols namely Proactive, Reactive and Hybrid, performance comparison of Proactive such as DSDV, Reactive as AODV, DSR, TORA and Hybrid as ZRP in different network scenarios including dynamic network size, changing number of nodes, changing movability of nodes, in high movability and denser network and low movability and low traffic. This paper analyzes these scenarios on the performance evaluation metrics e.g. Throughput, Packet Delivery Ratio (PDR), Normalized Routing Load(NRL) and End To-End delay(ETE).This paper also reviews various network layer security attacks challenge by routing protocols, detection mechanism proposes to detect these attacks and compare performance of these attacks on evaluation metrics such as Routing Overhead, Transmission Delay and packet drop rates.
Amina KhatunEmail author,Mahmudur Rahman,Khaza Nur Uddin,Kamrul Ahsan,Sabequn Nahar Shimu,Khadejatul Kobra,Shamme Akter Shimu,Wahidul Haque,Tobibur Rahman,Tangila Hoque Jessy,Farzana Akhter 경희대학교 융합한의과학연구소 2016 Oriental Pharmacy and Experimental Medicine Vol.31 No.4
Traditional medicinal practitioners or Kavirajes use a variety of medicinal plants for treatment of thrombus ailments-cardiovascular problems. In this study, thrombolytic activity of 36 extracts of different solvents of eight Bangladeshi medicinal plants traditionally used in cardiovascular problems were evaluated to justify their use in folklore medicinal practitice. Extraction was conceded using methanol. Five grams of the concentrated methanol extract of each crude extract were then fractionated to provide n-hexane and carbon tetrachloride fractions. Phytochemically important groups like reducing sugars, tannins, saponins, steroids, gums, flavonoids and alkaloids were tested using standard chromogenic reagents. In vitro thrombolytic potential of extracts was assayed for analyzing the clot lyses by adding the extracts to the pre-clotted blood. The results were compared with the results obtained from streptokinase as standard and water as a negative control. Thrombolytic effect of the extracts ranged from 0.73 ± 2.44 % to 45.81 ± 0.34 % clot lysis whereas the standard streptokinase showed 65.13 ± 0.96 % and the negative control water showed 2.50 ± 0.67 % clot lysis. The highest thrombolytic effect was shown by the crude extract of Melastoma malabathricum leaves and the lowest by the CCl4 fractionate of Litsea glutinosa leaves. Most of the results were found relevant to the traditional use of the plants. Plants traditionally used in thrombus ailments may be an interesting source for further drug development.
Amina Irakoze,Kee Han Ki,Lee Young-A 대한건축학회 2020 Architectural research Vol.22 No.1
The purpose of this study was to evaluate the variation in building energy predictions caused by simulation settings related to building envelop thickness. The study assessed the ceiling depth impact on skylight energy performance through OpenStudio integrated Radiance and EnergyPlus simulation programs. A ceiling as deep as 1.5 to 3m was analyzed for skylight to roof ratios from 1% to 25%. The results indicated that the building ceiling depth negatively affected the capability of skylights to significantly reduce building energy consumption. Through a parametric analysis, the study concluded that 8%, 9%, 10% and 11% skylight to roof ratio were optimal in terms of total building energy consumption for a ceiling depth of 1.5m, 2m, 2.5m and 3m, respectively. In addition, the results showed that the usually recommended 5% skylight to roof ratio was only efficient when no ceiling depth was included in the simulation model. Furthermore, the study indicated that the building energy saved by the optimal skylight of each ceiling depth decreased as the ceiling depth deepened. The highest total building energy reduction was 9%, 7%, 5% and 3% for a ceiling depth of 1.5m, 2m, 2.5m and 3m, respectively. This study induced that the solar heat gains and daylight visible transmittance by ceiling depth were crucial in the predictions of skylight energy performance and should not be neglected through building simulation simplifications as it is commonly done in most simulation programs’ settings.
Single Image Dehazing: An Analysis on Generative Adversarial Network
Amina Khatun,Mohammad Reduanul Haque,Rabeya Basri,Mohammad Shorif Uddin International Journal of Computer ScienceNetwork S 2024 International journal of computer science and netw Vol.24 No.2
Haze is a very common phenomenon that degrades or reduces the visibility. It causes various problems where high quality images are required such as traffic and security monitoring. So haze removal from images receives great attention for clear vision. Due to its huge impact, significant advances have been achieved but the task yet remains a challenging one. Recently, different types of deep generative adversarial networks (GAN) are applied to suppress the noise and improve the dehazing performance. But it is unclear how these algorithms would perform on hazy images acquired "in the wild" and how we could gauge the progress in the field. This paper aims to bridge this gap. We present a comprehensive study and experimental evaluation on diverse GAN models in single image dehazing through benchmark datasets.
Amina Irakoze(아미나 이라코제),Kee Han Kim(김기한),Lee Young-A(이영아) 대한건축학회 2019 대한건축학회 학술발표대회 논문집 Vol.39 No.2
This study aimed at the assessment of ceiling depth impact on skylight energy performance through OpenStudio integrated Radiance and EnergyPlus program. A ceiling as deep as 1.5 to 3m was analyzed for skylight to roof ratio from 1% to 25%. Through a parametric analysis, the study concluded that 8%, 9%, 10% and 11% skylight to roof ratio were optimal in terms of total building energy consumption for a ceiling depth of 1.5m, 2m, 2.5m and 3m respectively. In addition, the results showed that the usually recommended 5% skylight to roof ratio was only efficient when no ceiling depth was included in the simulation model. Therefore, study induced that ceiling depth was crucial in the analysis of skylight and should not be excluded for the simplicity of simulation model.
Amina Fouad Farag,Dalia Ali Abou-Alnour,Noha Saleh Abu-Taleb 대한영상치의학회 2018 Imaging Science in Dentistry Vol.48 No.4
Purpose: Oral carcinoma cuniculatum is a rare well-differentiated variant of oral squamous cell carcinoma. The purpose was to systematically review its unique features to differentiate it from other variants as verrucous carcinoma, papillary squamous cell carcinoma and well-differentiated squamous cell carcinoma. Materials and Methods: A systematic review was performed using MEDLINE, Dentistry and Oral Sciences Source and PubMed databases and any existing articles related to the research subject missed in the search strategy to screen ones reporting cases occurring exclusively in the oral cavity in English literature. Variables analyzed included clinical, etiologic, imaging, histopatholgical features, treatment, follow-up and survival rates. Results: From 229 hits, 17 articles with 43 cases were included in the systematic review. Clinically it showed a female predilection with pain and/or ulceration of a relatively long duration and exudation being the most common symptoms. Histologically, it showed more endophytic features comprising well-differentiated squamous epithelium with absent or minimal cytological atypia and multiple keratin filled crypts or cuniculus. Inflammatory stromal reaction and discharging abscesses were reported in most of the cases. Bone destruction was predominant in most imaging features. Complete surgical resection with a safety margin was the treatment of choice in most of the cases with few recorded recurrence cases. Conclusion: Apprehensive knowledge of oral carcinoma cuniculatum unique features is essential to avoid its misdiagnosis and provide proper treatment especially for recurrent cases.