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Contrast Normalization strategies in Brain Tumor Imaging:From Preprocessing to Classification

Computer Modeling in Engineering & sciences 2024年第8期140卷 1539-1562页

作者： samar M.Alqhtani toufique a.s.omro Faisal Bin Ubaid Ahmed Ali Muhammad Irfan Abdullah A.Asiri Department of Information systems College of Computer Science and Information SystemsNajran UniversityNajran61441Saudi Arabia Department of Electronic Engineering The University of LarkanoLarkanaSindh75660Pakistan Computer science Department Sukkur IBA UniversitySukkurSindh65200Pakistan Eletrical Engineering Department Sukkur IBA UniversitySukkurSindh65200Pakistan Electrical Engineering Department College of EngineeringNajran UniversityNajran61441Saudi Arabia Radiological sciences Department College of Applied Medical SciencesNajran UniversityNajran61441Saudi Arabia

Cancer-related to the nervous system and brain tumors is a leading cause of mortality in various *** resonance imaging(MRI)and computed tomography(CT)are utilized to capture brain *** plays a crucial role in the diagnosis of brain tumors and the examination of other brain ***,manual assessment of MRI images by radiologists or experts is performed to identify brain tumors and abnormalities in the early stages for timely ***,early diagnosis of brain tumors is intricate,necessitating the use of computerized *** research introduces an innovative approach for the automated segmentation of brain tumors and a framework for classifying different regions of brain *** proposed methods consist of a pipeline with several stages:preprocessing of brain images with noise removal based on Wiener Filtering,enhancing the brain using Principal Component Analysis(PCA)to obtain well-enhanced images,and then segmenting the region of interest using the Fuzzy C-Means(FCM)clustering technique in the third *** final step involves classification using the support Vector Machine(sVM)*** classifier is applied to various types of brain tumors,such as meningioma and pituitary tumors,utilizing the Contrast-Enhanced Magnetic Resonance Imaging(CE-MRI)*** proposed method demonstrates significantly improved contrast and validates the effectiveness of the classification framework,achieving an average sensitivity of 0.974,specificity of 0.976,accuracy of 0.979,and a Dice score(DsC)of ***,this method exhibits a shorter processing time of 0.44 s compared to existing *** performance of this method emphasizes its significance when compared to state-of-the-art methods in terms of sensitivity,specificity,accuracy,and *** enhance the method further in the future,it is feasible to standardize the approach by incorporating a set of classifiers to increase the robustness of the brain classi

关键词： Brain tumor magnetic resonance imaging principal component analysis fuzzy c-clustering support vector machine

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Transonic Moist Air Flow around a Circular Arc Blade with Bump

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Journal of Thermal science 2009年第4期18卷 325-331页

作者： A.B.M.toufique HAsAN shigeru MATsUO Toshiaki sETOGUCHI Heuy Dong KIM Department of Mechanical Engineering Bangladesh University of Engineering and Technology Department of Mechanical Engineering Saga University school of Mechanical Engineering Andong National University

The unsteady phenomena in the transonic flow around airfoils are observed in the flow field of fan, compressor blades and butterfly valves, and this causes often serious problems such as aeroacoustic noise and the vibration. In recent years, the effect of bump wall on the flow field around an airfoil has been investigated experimentally and as a result, it was observed that the bump wall is effective for the control of shock wave on the airfoil. In the transonic or supersonic flow field, a rapid expansion of moist air or steam gives rise to non-equilibrium condensation. In the present study, the effect of non-equilibrium condensation of moist air on the self-excited shock wave oscillation around a circular arc blade with or without a bump on the blade was investigated numerically. The results showed that the non-equilibrium condensation significantly reduced the flow field unsteadiness such as root mean of pressure oscillation and frequency compared to the case without the non-equilibrium condensation.

关键词： transonic flow moist air shock wave oscillation non-equilibrium condensation

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Characteristics of transonic moist air flows around butterfly valves with spontaneous condensation

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Propulsion and Power Research 2015年第2期4卷 72-83页

作者： A.B.M.toufique Hasan s.Matsuo T.setoguchib Department of Mechanical Engineering Bangladesh University of Engineering and Technology(BUET)Dhaka-1000Bangladesh Department of Advanced Technology Fusion Saga UniversitySaga 8408502Japan

Effects of spontaneous condensation of moist air on the shock wave dynamics around butterfly valves in transonic flows are investigated by experimental and numerical *** symmetric valve disk shapes namely-a flat rectangular plate and a mid-plane cross-section of a prototype butterfly valve have been studied in the present *** showed that in case with spontaneous condensation,the root mean square of pressure oscillation(induced by shock dynamics)is reduced significantly with those without condensation for both shapes of the ***,local aerodynamic moments were reduced in case with condensation which is considered to be beneficial in torque requirement in case of on/off applications of valves as flow control ***,total pressure loss was increased with spontaneous condensation in both the ***,the disk shape of a prototype butterfly valve showed better aerodynamic performances compared to flat rectangular plate profile in respect of total pressure loss and vortex shedding frequency in the wake region.

关键词： Transonic flow shock waves spontaneous condensation Butterfly valves Reynolds-averaged Navier-stokes(RANs)

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Unsteady Transonic Flow Control around an Airfoil in a Channel

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Journal of Thermal science 2016年第2期25卷 117-122页

作者： Md.Abdul Hamid A.B.M.toufique Hasan Mohammad Ali Yuichi Mitsutake Toshiaki setoguchi shen Yu Department of Mechanical Engineering Bangladesh University of Engineering and Technology (BUET) Institute of Ocean Energy Saga University Institute of Engineering Thermophysics Chinese Academy of Science

Transonic internal flow around an airfoil is associated with self-excited unsteady shock wave oscillation. This unsteady phenomenon generates buffet, high speed impulsive noise, non-synchronous vibration, high cycle fatigue failure and so on. Present study investigates the effectiveness of perforated cavity to control this unsteady flow field. The cavity has been incorporated on the airfoil surface. The degree of perforation of the cavity is kept constant as 30%. However, the number of openings(perforation) at the cavity upper wall has been varied. Results showed that this passive control reduces the strength of shock wave compared to that of baseline airfoil. As a result, the intensity of shock wave/boundary layer interaction and the root mean square(RMs) of pressure oscillation around the airfoil have been reduced with the control method.

关键词： transonic flow passive control shock wave oscillation

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Compressible flow characteristics around a biconvex arc airfoil in a channel

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Propulsion and Power Research 2014年第1期3卷 29-40页

作者： Md.Abdul Hamid A.B.M.toufique Hasan s.M.Alimuzzaman s.Matsuo T.setoguchi Department of Mechanical Engineering Bangladesh University of Engineering and Technology(BUET)Dhaka-1000Bangladesh Department of Advanced Technology Fusion Saga UniversitySaga 8408502Japan

shock wave-boundary layer interactions(sWBLI)are observed in several practical high-speed internal flows,such as compressor blades,turbine cascades,nozzles and so *** induced oscillations(sIO),aerodynamic instabilities so-called buffet flows,flutter,aeroacoustic noise and vibration are the detrimental consequences of this unsteady shockboundary layer *** the present study,a numerical computation has been performed to investigate the compressible flow characteristics around a 12%thick biconvex circular arc airfoil in a two dimensional *** averaged Navier-stokes equations with two equation k-ωshear stress transport(ssT)turbulence model have been applied for the computational *** flow field characteristics has been studied from pressure ratio(ratio of back pressure,pb to inlet total pressure,p01)of 0.75 to *** present computational results have been compared and validated with the available experimental *** results showed that the internal flow field characteristics such as shock wave structure,its behavior(steady or unsteady)and the corresponding boundary layer interaction are varied with pressure ***-excited shock oscillation was observed at certain flow ***,the mode of unsteady shock oscillation and its frequency are varied significantly with change of pressure ratio.

关键词： Compressible flow shock waves shock induced oscillation Frequency Reynolds-averaged Navier-stokes(RANs)

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Design and Development of Low-cost Wearable Electroencephalograms (EEG) Headset

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Intelligent Automation & soft Computing 2023年第3期35卷 2821-2835页

作者： Riaz Muhammad Ahmed Ali M.Abid Anwar toufique Ahmed soomro Omar Alshorman Adel Alshahrani Mahmoud Masadeh Ghulam Md Ashraf Naif H.Ali Muhammad Irfan Athanasios Alexiou Department of Electrical Engineering Sukkur IBA University65200SukkurPakistan Department of Electronic Engineering Quaid-e-Awam University of EngineeringScience and TechnologyLarkana77150Pakistan Faculty of Engineering and Alshrouk Trading Company Najran UniversityNajran61441Saudi Arabia Department of Medical Rehabilitation sciences-Physiotherapy Program College of Applied Medical SciencesNajran UniversityNajran61441Saudi Arabia Computer Engineering Department Yarmouk UniversityIrbid21163Jordan Pre-Clinical Research Unit King Fahd Medical Research CenterKing Abdulaziz UniversityJeddah21589Saudi Arabia Department of Medical Laboratory Technology Faculty of Applied Medical SciencesKing Abdulaziz UniversityJeddah21589Saudi Arabia Department of Internal Medicine Medical CollegeNajran UniversityNajran61441Saudi Arabia Electrical Engineering Department College of EngineeringNajran University Saudi ArabiaNajran61441Saudi Arabia Novel Global Community Educational Foundation HebershamNSW 2770AustraliaAFNP Med AustriaWien2770Austria

Electroencephalogram(EEG)is a method of capturing the electrophy-siological signal of the *** EEG headset is a wearable device that records electrophysiological data from the *** paper presents the design and fab-rication of a customized low-cost Electroencephalogram(EEG)headset based on the open-source OpenBCI Ultracortex Mark IV *** electrode placement locations are modiﬁed under a 10–20 standard *** fabricated headset is then compared to commercially available headsets based on the following para-meters:affordability,accessibility,noise,signal quality,and ***,the data is recorded from 20 subjects who used the EEG Headset,and signals were ***,the participants marked the accuracy,set up time,participant comfort,and participant perceived ease of set-up on a scale of 1 to 7(7 being excellent).Thirdly,the self-designed EEG headband is used by 5 participants for slide *** raw EEG signal is decomposed into a series of band sig-nals using discrete wavelet transform(DWT).Lastly,theseﬁndings have been compared to previously reported *** concluded that when used for slide-changing control,our self-designed EEG headband had an accuracy of 82.0 *** also concluded from the results that our headset performed well on the cost-effectiveness scale,had a reduced setup time of 2±0.5 min(the short-est among all being compared),and demonstrated greater ease of use.

关键词： Brain-computer interface EEG consumer-grade accessibility headset

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Control of Transonic shock Wave Oscillation over a supercritical Airfoil

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Open Journal of Fluid Dynamics 2015年第4期5卷 302-310页

作者： Muhammad Rizwanur Rahman Mohammad Itmam Labib Abul Bashar Mohammad toufique Hasan Mohammad saddam Hossain Joy Toshiaki setoguchi Heuy Dong Kim Department of Mechanical Engineering Bangladesh University of Engineering and Technology (BUET) Dhaka Bangladesh Institute of Ocean Energy Saga University Saga Japan Department of Mechanical Engineering Andong National University South Korea

In the present study, a numerical investigation is carried out on the aerodynamic performance of a supercritical airfoil RAE 2822. Transonic flow fields are considered where self-excited shock wave oscillation prevails. To control the shock oscillation, a passive technique in the form of an open rectangular cavity is introduced on the upper surface of the airfoil where the shock wave oscillates. Reynolds Averaged Navier-stokes (RANs) equations have been used to predict the aerodynamic behavior of the baseline airfoil and airfoil with cavity at Mach number of 0.729 and at angle of attack of 5°. The aerodynamic characteristics of the baseline airfoil are well validated with the available experimental data. It is observed that the introduction of a cavity around the airfoil upper surface can completely stop the self-excited shock wave oscillation and successively improve the aerodynamic characteristics.

关键词： Transonic Flow shock Oscillation Passive Control Airfoil

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环氧树脂模填加剂模压处理后对MOs场效应晶体管引线键合可靠性的影响(英文)

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电子工业专用设备 2007年第12期36卷 19-25,31页

作者： Rohit T. Nayak toufique Ahmed Arvind Krishna Ken Hollis Delphi Technical Center India 4th Floor Innovator ITPL Bangalore-560 066 India

氧化硅填充环氧树脂在作为芯片封装的密封中对微电子器件的可靠性与功能起着一种主要影响。在帮助了解铝引线键合内部类似功率MOs场效应晶体管的一种含铅电子组件的可靠性,在热力学机械特性试验结果表明由于栅离层的焊线接近引线框架,... 详细信息

氧化硅填充环氧树脂在作为芯片封装的密封中对微电子器件的可靠性与功能起着一种主要影响。在帮助了解铝引线键合内部类似功率MOs场效应晶体管的一种含铅电子组件的可靠性,在热力学机械特性试验结果表明由于栅离层的焊线接近引线框架,在键合后从-40℃到125℃的功率热循环下,导致了键合样品的一种电气开路。采用有限元模型模拟了这种封装应力,根据经验检验结果本模拟预示那些在引线键合支撑的焊跟处具有较高的平面剪切力。由数字模拟和试验数据获得的结果可作为选定适当模塑添加剂的一种指导路线。

关键词：可靠性故障分析热膨胀系数平面剪切力 MOs场效应晶体管

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