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Visualizing traumatic brain injury:ocular clues for diagnosis and assessment

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Neural Regeneration Research 2025年第5期20卷 1399-1400页

作者： Morteza Abyadeh Vivek Gupta Yuyi You Joao A.Paulo Mehdi Mirzaei ProGene technologies Pty Ltd SydneyNSWAustralia Department of Clinical Medicine Faculty of MedicineHealth and Human SciencesMacquarie Medical SchoolMacquarie UniversityMacquarie ParkNorth RydeSydneyNSWAustralia Department of Cell Biology Harvard Medical SchoolBostonMAUSA

Traumatic brain injury (TBI) is defined as damage to the brain resulting from an external sudden physical force or shock to the *** is considered a silent public health epidemic causing significant death and disability *** were 64,000 TBI related deaths reported in the USA in 2020,with about US$76 billion in direct and indirect medical costs annually.

关键词： diagnosis ocular injury

High Power Highly Nonlinear Holey Fiber with Low Confinement Loss for Supercontinuum Light Sources

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Journal of Electronic Science and Technology 2018年第1期16卷 69-73页

作者： Feroza Begum Juliana Zaini Saifullah Abu Bakar Iskandar Petra Yoshinori Namihira faculty of integrated technologies Universiti Brunei DarussalamGadong BE 1410 University of the Ryukyus Okinawa 903-0213

The high power holey fiber is an efficient supercontinuum light source by using picosecond pulse,which is a less expensive laser source compared with low power and expensive femtosecond laser sources. In this paper, a high power highly nonlinear holey fiber(HN-HF) with a low confinement loss is proposed for supercontinuum light sources. The finite difference method is used to calculate the different properties of the proposed HN-HF. High nonlinear coefficients are obtained at 1.06 μm, 1.31μm, and 1.55μm wavelengths with flattened chromatic dispersion and low confinement losses simultaneously. Moreover, numerical simulation results show that high power broad supercontinuum spectra with very short length of the proposed photonic crystal fiber are achieved.

关键词： Chromatic dispersion effective area holey fiber supercontinuum spectrum

An efficient aerodynamic shape optimization of blended wing body UAV using multi-fidelity models

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Chinese Journal of Aeronautics 2018年第6期31卷 1165-1180页

作者： Parviz MOHAMMAD ZADEH Mohsen SAYADI faculty of New Sciences and technologies University of Tehran

This paper presents a novel optimization technique for an efficient multi-fidelity model building approach to reduce computational costs for handling aerodynamic shape optimization based on high-fidelity simulation models. The wing aerodynamic shape optimization problem is solved by dividing optimization into three steps—modeling 3D（high-fidelity） and 2D（lowfidelity） models, building global meta-models from prominent instead of all variables, and determining robust optimizing shape associated with tuning local meta-models. The adaptive robust design optimization aims to modify the shape optimization process. The sufficient infilling strategy—known as adaptive uniform infilling strategy—determines search space dimensions based on the last optimization results or initial point. Following this, 3D model simulations are used to tune local meta-models. Finally, the global optimization gradient-based method—Adaptive Filter Sequential Quadratic Programing（AFSQP） is utilized to search the neighborhood for a probable optimum point. The effectiveness of the proposed method is investigated by applying it, along with conventional optimization approach-based meta-models, to a Blended Wing Body（BWB） Unmanned Aerial Vehicle（UAV）. The drag coefficient is defined as the objective function, which is subjected to minimum lift coefficient bounds and stability constraints. The simulation results indicate improvement in meta-model accuracy and reduction in computational time of the method introduced in this paper.

关键词： Adaptive filter sequential quadratic programing(AFSQP) Adaptive robust meta-model Aerodynamic shape optimization Blended wing body(BWB) Move limit strategy Unmanned aerial vehicle(UAV)

ELASTODYNAMIC ANALYSIS OF A FUNCTIONALLY GRADED HALF-PLANE WITH MULTIPLE SUB-SURFACE CRACKS

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Acta Mechanica Solida Sinica 2012年第1期25卷 90-99页

作者： Rasul Bagheri Mojtaba Ayatollahi Alibakhsh Kasaeian faculty of Engineering Zanjan University faculty of New Sciences and technologies University of Tehran

The stress fields are obtained for a functionally graded half-plane containing a Volterra screw *** elastic shear modulus of the medium is considered to vary *** dislocation solution is utilized to formulate integral equations for the half-plane weakened by multiple smooth cracks under anti-plane *** integral equations are of Cauchy singular type at the location of dislocation which are solved *** examples are solved and the stress intensity factors are obtained.

关键词： functionally graded materials half-plane multiple cracks screw dislocation

Structural optimization of filament wound composite pipes

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Frontiers of Structural and Civil Engineering 2022年第8期16卷 1056-1069页

作者： Roham RAFIEE Reza SHAHZADI Hossein SPERESP faculty of New Science and technologies University of TehranTehran ***Iran

An optimization procedure is developed for obtaining optimal structural design of filament wound composite pipes with minimum cost utilized in pressurized water and waste-water ***,the short-term and long-term design constraints dictated by international standards are ***,proper computational tools are developed for predicting the structural properties of the composite pipes based on the design architecture of *** developed computational tools are validated by relying on experimental ***,an integrated design-optimization process is developed to minimize the price as the main objective,taking into account design requirements and manufacturing limitations as the constraints and treating lay-up sequence,fiber volume fraction,winding angle,and the number of total layers as design *** developed method is implemented in various case studies,and the results are presented and discussed.

关键词： composite pipes optimization experimental validation computational modeling filament winding

A model of flow separation controlled by dielectric barrier discharge

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Chinese Journal of Aeronautics 2017年第5期30卷 1660-1669页

作者： Mohammadreza BARZEGARAN Amirreza KOSARI faculty of New Science and technologies University of Tehran Tehran *** Iran

Flow separation, as an aerodynamic phenomenon, occurs in specific conditions. The conditions are studied in a wind tunnel on different airfoils. The phenomenon can be delayed or suppressed by exerting an external momentum to the flow. Dielectric barrier discharge actuators arranged in a row of 8 and perpendicular to the flow direction can delay flow separation by exerting the momentum. In this study, a mathematical model is developed to predict a parameter, which is utilized to represent flow separation on an NACA0012 airfoil. The model is based on the neurofuzzy method applied to experimental datasets. The neuro model is trained in different flow conditions and the parameter is measured by pressure sensors.

关键词： Dielectric barrier discharge Flow separation Mathematical model NACA0012 airfoil Neuro-fuzzy

Probability Enhanced Entropy(PEE) Novel Feature for Improved Bird Sound Classification

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Machine Intelligence Research 2022年第1期19卷 52-62页

作者： Ramashini Murugaiya Pg Emeroylariffion Abas Liyanage Chandratilak De Silva faculty of integrated technologies Universiti Brunei DarussalamBandar Seri Begawan BE1410Brunei Darussalam Department of Computer Science and Informatics Uva Wellassa UniversityBadulla 90000Sri Lanka

Identification of bird species from their sounds has become an important area in biodiversity-related research due to the relative ease of capturing bird sounds in the commonly challenging habitat. Audio features have a massive impact on the classification task since they are the fundamental elements used to differentiate classes. As such, the extraction of informative properties of the data is a crucial stage of any classification-based application. Therefore, it is vital to identify the most significant feature to represent the actual bird sounds. In this paper, we propose a novel feature that can advance classification accuracy with modified features, which are most suitable for classifying birds from its audio sounds. Modified Gammatone frequency cepstral coefficient(GTCC) features have been extracted with their frequency banks adjusted to suit bird sounds. The features are then used to train and test a support vector machine(SVM) classifier. It has been shown that the modified GTCC features are able to give 86% accuracy with twenty Bornean birds. Furthermore, in this paper, we are proposing a novel probability enhanced entropy(PEE) feature, which, when combined with the modified GTCC features, is able to improve accuracy further to 89.5%. These results are significant as the relatively low-resource intensive SVM with the proposed modified GTCC, and the proposed novel PEE feature can be implemented in a real-time system to assist researchers,scientists, conservationists, and even eco-tourists in identifying bird species in the dense forest.

关键词： Bird sounds classification Gammatone frequency cepstral coefficient(GTCC) probability enhanced entropy(PEE) support vector machine(SVM)

Robust nonlinear control for nuclear reactors using sliding mode observer to estimate the xenon concentration

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Nuclear Science and Techniques 2016年第2期27卷 106-114页

作者： G.R.Ansarifar H.R.Akhavan Department of Nuclear Engineering Faculty of Advanced Sciences and Technologies University of Isfahan

This paper presents findings on the sliding mode controller for a nuclear reactor. One of the important operations in nuclear power plants is load following. In this paper, a sliding mode control system, which is a robust nonlinear controller, is designed to control the pressurizedwater reactor power. The reactor core is simulated based on the point kinetics equations and six delayed neutron groups. Considering neutron absorber poisons and regarding the limitations of the xenon concentration measurement, a sliding mode observer is designed to estimate its value, and finally, a sliding mode control based on the sliding mode observer is presented to control the core power of reactor. The stability analysis is given by means Lyapunov approach; thus, the control system is guaranteed to be stable within a large range. The employed method is easy to implement in practical applications, and moreover,the sliding mode control exhibits the desired dynamic properties during the entire output-tracking process independent of perturbations. Simulation results are presented to demonstrate the effectiveness of the proposed observerbased controller in terms of performance, robustness and stability.

关键词：鲁棒非线性控制滑模观测器核反应堆估计氙气气浓度非线性鲁棒控制器滑模控制系统

Real-time stereo matching on CUDA using Fourier descriptors and dynamic programming

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Computational Visual Media 2019年第1期5卷 59-71页

作者： Mohamed Hallek Fethi Smach Mohamed Atri faculty of Sciences of Monastir technologies et services de l'information

Computation of stereoscopic depth and disparity map extraction are dynamic research topics.A large variety of algorithms has been developed,among which we cite feature matching, moment extraction, and image representation using descriptors to determine a disparity map. This paper proposes a new method for stereo matching based on Fourier descriptors. The robustness of these descriptors under photometric and geometric transformations provides a better representation of a template or a local region in the image. In our work, we specifically use generalized Fourier descriptors to compute a robust cost ***, a box filter is applied for cost aggregation to enforce a smoothness constraint between neighboring pixels. Optimization and disparity calculation are done using dynamic programming, with a cost based on similarity between generalized Fourier descriptors using Euclidean distance. This local cost function is used to optimize correspondences. Our stereo matching algorithm is evaluated using the Middlebury stereo benchmark; our approach has been implemented on parallel high-performance graphics hardware using CUDA to accelerate our algorithm, giving a real-time implementation.

关键词： generalized Fourier descriptors stereo matching dynamic programming CUDA