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Stress analysis of functionally graded rotating discs: analytical and numerical solutions

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Acta Mechanica Sinica 2011年第6期27卷 950-955页

作者： hasan Callioglu numan Behll Bektas Metin Sayer Department of Mechanical Engineering Pamukkale University

This study deals with stress analysis of annular rotating discs made of functionally graded materials（FGMs）.Elasticity modulus and density of the discs are assumed to vary radially according to a power law function,but the material is of constant Poisson＇s ratio.A gradient parameter n is chosen between 0 and *** n = 0,the disc becomes a homogeneous isotropic *** and radial stress distributions and displacements on the disc are investigated for various gradient parameters n by means of the diverse elasticity modulus and density by using analytical and numerical ***,a homogenous tangential stress distribution and the lowest radial stresses along the radius of a rotating disc are approximately obtained for the gradient parameter n = 1.0 compared with the homogeneous,isotropic case n = *** means that a disc made of FGMs has the capability of higher angular rotations compared with the homogeneous isotropic disc.

关键词： Functional graded materials Stress analysis Analytical analysis Finite element analysis (FEA)

Statin, aspirin and metformin use and risk of hepatocellular carcinoma related outcomes following liver transplantation: A retrospective study

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World Journal of Transplantation 2024年第3期14卷 120-131页

作者： William Chung Kevin Wong Noel Ravindranayagam Lauren Tang Josephine Grace Darren Wong Danny Con Marie Sinclair Avik Majumdar numan Kutaiba Samuel Hui Paul Gow Vijayaragavan Muralidharan Alexander Dobrovic Adam Testro Department of Gastroenterology Austin HealthHeidelberg 3084VictoriaAustralia Victorian Liver Transplant Unit Austin HealthHeidelberg 3084VictoriaAustralia Department of Radiology Austin HealthHeidelberg 3084VictoriaAustralia Department of Gastroenterology Monash HealthClayton 3168VictoriaAustralia Department of Surgery University of MelbourneAustin HealthHeidelberg 3048VictoriaAustralia Department of Surgery Beacon LaboratoryAustin PrecinctThe University of MelbourneAustin HospitalHeidelberg 3048VictoriaAustralia

BACKGROUND Liver transplantation(LT)is a potentially curative therapy for patients with hepatocellular carcinoma(HCC).HCC-recurrence following LT is associated with reduced *** is increasing interest in chemoprophylaxis to improve HCC-related outcomes *** To investigate whether there is any benefit for the use of drugs with proposed chemoprophylactic properties against HCC,and patient outcomes following *** This was a retrospective study of adult patients who received Deceased Donor LT for HCC from 2005-2022,from a single Australian *** use was defined as statin,aspirin or metformin therapy for≥29 days,within 24 months post-LT.A cox proportional-hazards model with time-dependent covariates was used for survival *** measures were the composite-endpoint of HCC-recurrence and all-cause mortality,HCC-recurrence and HCC-related *** analysis was performed to account for immortality time bias and statin *** Three hundred and five patients were included in this study,with 253(82.95%)males with a median age of 58.90 *** of liver disease were 150(49.18%)hepatitis C,73(23.93%)hepatitis B(HBV)and 33(10.82%)non-alcoholic fatty liver disease(NAFLD).56(18.36%)took statins,51(16.72%)aspirin and 50(16.39%)*** a median follow-up time of 59.90 months,34(11.15%)developed HCC-recurrence,48(15.74%)died,17(5.57%)from HCC-related ***,aspirin or metformin use was not associated with statistically significant differences in the composite endpoint of HCC-recurrence or all-cause mortality[hazard ratio(HR):1.16,95%CI:0.58-2.30;HR:1.21,95%CI:0.28-5.27;HR:0.61,95%CI:0.27-1.36],HCC-recurrence(HR:0.52,95%CI:0.20-1.35;HR:0.51,95%CI:0.14-1.93;HR 1.00,95%CI:0.37-2.72),or HCC-related mortality(HR:0.32,95%CI:0.033-3.09;HR:0.71,95%CI:0.14-3.73;HR:1.57,95%CI:0.61-4.04)*** dosing was not associated with statist-ically significant differences in HCC-related ***

关键词： Liver transplantation Hepatocellular carcinoma Transplant oncology Statins HMG-Co-A reductase Aspirin Metformin Mammalian target of rapamycin

Binary Representation of Polar Bear Algorithm for Feature Selection

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Computer Systems Science & Engineering 2022年第11期43卷 767-783页

作者： Amer Mirkhan numanÇelebi Sakarya University Computer Engineering DepartmentSakaryaTurkey Sakarya University Information Systems Engineering DepartmentSakaryaTurkey

In most of the scientific research feature selection is a challenge for *** all available features is not an option as it usually complicates the research and leads to performance drop when dealing with large *** the other hand,ignoring some features can compromise the data *** the rough set theory presents a good technique to identify the redundant features which can be dismissed without losing any valuable information,however,exploring all possible combinations of features will end with NP-hard *** this research we propose adopting a heuristic algorithm to solve this problem,Polar Bear Optimization PBO is a metaheuristic algorithm provides an effective technique for solving such kind of optimization *** other heuristic algorithms it proposes a dynamic mechanism for birth and death which allows keep investing in promising solutions and keep dismissing hopeless *** evaluate its efficiency,we applied our proposed model on several datasets and measured the quality of the obtained minimal feature set to prove that redundant data was removed without data loss.

关键词： Optimization rough set feature selection heuristic algorithms

Automated Video Generation of Moving Digits from Text Using Deep Deconvolutional Generative Adversarial Network

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Computers, Materials & Continua 2023年第11期77卷 2359-2383页

作者： Anwar Ullah Xinguo Yu Muhammad numan National Engineering Research Center for E-Learning Central China Normal UniversityWuhan430079China Wollongong Joint Institute Central China Normal UniversityWuhan430079China

Generating realistic and synthetic video from text is a highly challenging task due to the multitude of issues involved,including digit deformation,noise interference between frames,blurred output,and the need for temporal coherence across *** this paper,we propose a novel approach for generating coherent videos of moving digits from textual input using a Deep Deconvolutional Generative Adversarial Network(DD-GAN).The DDGAN comprises a Deep Deconvolutional Neural Network(DDNN)as a Generator(G)and a modified Deep Convolutional Neural Network(DCNN)as a Discriminator(D)to ensure temporal coherence between adjacent *** proposed research involves several ***,the input text is fed into a Long Short Term Memory(LSTM)based text encoder and then smoothed using Conditioning Augmentation(CA)techniques to enhance the effectiveness of the Generator(G).Next,using a DDNN to generate video frames by incorporating enhanced text and random noise and modifying a DCNN to act as a Discriminator(D),effectively distinguishing between generated and real *** research evaluates the quality of the generated videos using standard metrics like Inception Score(IS),Fréchet Inception Distance(FID),Fréchet Inception Distance for video(FID2vid),and Generative Adversarial Metric(GAM),along with a human study based on realism,coherence,and *** conducting experiments on Single-Digit Bouncing MNIST GIFs(SBMG),Two-Digit Bouncing MNIST GIFs(TBMG),and a custom dataset of essential mathematics videos with related text,this research demonstrates significant improvements in both metrics and human study results,confirming the effectiveness of *** research also took the exciting challenge of generating preschool math videos from text,handling complex structures,digits,and symbols,and achieving successful *** proposed research demonstrates promising results for generating coherent videos from textual input.

关键词： Generative Adversarial Network(GAN) deconvolutional neural network convolutional neural network Inception Score(IS) temporal coherence Fréchet Inception Distance(FID) Generative Adversarial Metric(GAM)

The medial preoptic area and the regulation of parental behavior

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Neuroscience Bulletin 2014年第5期30卷 863-865页

作者： Kumi O.Kuroda Michael numan Research Unit for Affiliative Social Behavior RIKEN Brain Science Institute Rio Rancho

The preoptic area （POA） is located in the most anterior part of the hypothalamus and is bordered dorsally by the anterior commissure and anteroventrally by the nucleus of the diagonal band of Broca[1]. Accumulating evidence from developmental neurobiology suggests, however, that the POA may be a separate entity from hypothalamus, and may actually be part of the basal telencephalon[2,3]. Both the hypothalamus and POA are highly complex and heterogeneous areas, containing multiple nuclei, each of which has specific fundamental functions for survival. Among these, the POA contains nuclei involved in the regulation of blood osmolality and temperature （the median preoptic nucleus）, sleep （the ventrolateral preoptic and suprachiasmatic nuclei）, ovulation （gonadotropin-releasing hormone neurons scattered mainly in the ventral part of the POA）, male sexual behavior （the medial preoptic nucleus）, and parental behavior （the central part of the medial POA, cMPOA）.

关键词： MPOA The medial preoptic area and the regulation of parental behavior area

Risk perception and safety analysis on petroleum production system of three gas fields in Bangladesh

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Journal of Safety Science and Resilience 2022年第4期3卷 362-371页

作者： Md.numan Hossain M.Farhad Howladar Department of Petroleum&Mining Engineering Shahjalal University of Science&TechnologySylhet 3114Bangladesh

Accidents are common in the petroleum *** risk of accidents can be easily minimized by understand-ing the harm early in the production *** study presents a perception-based risk and safety analysis of petroleum production *** were collected from three fields operated by Sylhet Gas Fields Limited in *** Statistical Package for the Social Sciences(SPSS)software was used to analyze the *** results were then subjected to a frequency analysis,an analysis of variance(ANOVA),and a reliability *** frequency analysis indicated the overall safety situation,and the ANOVA models and reliability analysis sub-stantiated the results.A chi-squared test indicated the association between the *** outcomes of the risk matrix indicated various risk levels,such as low,moderate,and *** to the implicit risks,necessary measures were recommended for the industry’s future.

关键词： Oil and gas industry Perceived risk Risk matrix Qualitative data Hazard identification

Stock Market's Response to Real Output Shocks in China: A VARwAL Estimation

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China & World Economy 2023年第5期31卷 1-25页

作者： numan Ulki Kexing Wu Institute of Economic Studies Charles UniversityCzechia School of Commerce University of South AustraliaAustralia

This paper studies the connection between the stock market and real output in China and compares it with benchmark countries,employing a novel vector autoregression with asymmetric leads(VARwAL)*** makes two ***,it finds that the time profile of the Chinese stock market's response to real output shocks suggests no evidence of a distorted relationship due to manipulation of Chinese real output data or domination of the Chinese stock market by individual ***,the Chinese stock market is relatively more responsive to real output,in line with the larger share of manufacturing in the Chinese *** output and industrial profits,two different,less-manipulable time series,yield similar ***,it presents the first use of VARwAL impulse responses to detect stock market bubbles:VARwAL captures the 2015 bubble in China *** the full sample period,China's stock market appears to have been less prone to bubbles than the US stock market.

关键词： China real output shocks stock market VARwAL model

A systematic review of running-related musculoskeletal injuries in runners

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Journal of Sport and Health Science 2021年第5期10卷 513-522页

作者： Nicolas Kakouris numan Yener Daniel T.P.Fong National Centre for Sport and Exercise Medicine School of SportExercise and Health SciencesLoughborough UniversityLoughboroughLE113TUUK

Objective:Running-related musculoskeletal injuries(RRMIs),especially stemming from overuse,frequently occur in *** study aimed to systematically review the literature and determine the incidence and prevalence proportion of RRMIs by anatomic location and specific ***:An electronic database search with no date beginning restrictions was performed in SPORTDiscus,PubMed,and MEDLINE up to June *** studies were used to find the anatomic location and the incidence proportion of each RRMI,whereas retrospective or cross-sectional studies were used to find the prevalence proportion of each RRMI.A separate analysis for ultramarathon runners was ***:The overall injury incidence and prevalence were 40.2%±18.8%and 44.6%±18.4%(mean±SD),*** knee,ankle,and lower leg accounted for the highest proportion of injury incidence,whereas the knee,lower leg,and foot/toes had the highest proportion of injury *** tendinopathy(10.3%),medial tibial stress syndrome(9.4%),patellofemoral pain syndrome(6.3%),plantar fasciitis(6.1%),and ankle sprains(5.8%)accounted for the highest proportion of injury incidence,whereas patellofemoral pain syndrome(16.7%),medial tibial stress syndrome(9.1%),plantar fasciitis(7.9%),iliotibial band syndrome(7.9%),and Achilles tendinopathy(6.6%)had the highest proportion of injury *** ankle(34.5%),knee(28.1%),and lower leg(12.9%)were the 3 most frequently injured sites among ***:The injury incidence proportions by anatomic location between ultramarathoners and non-ultramarathoners were not significantly different(p=0.798).The pathologies with the highest incidence proportion of injuries were anterior compartment tendinopathy(19.4%),patellofemoral pain syndrome(15.8%),and Achilles tendinopathy(13.7%).The interpretation of epidemiological data in RRMIs is limited due to several methodological issues encountered.

关键词： Epidemiology Injury Injury prevention Rehabilitation Running

Development of a monitoring and warning system based on optical fiber sensing technology for masonry retaining walls and trees

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第4期14卷 1064-1076页

作者： Peichen Wu Daoyuan Tan Shaoqun Lin Wenbo Chen Jianhua Yin numan Malik An Li Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong KongChina

Hong Kong has a long history of applying masonry retaining walls to provide horizontal platforms and stabilize man-made *** to the sub-tropical climate,some masonry retaining walls are colonized by *** weather,such as typhoons and heavy rains,may cause rupture or root failure of those trees,thus resulting in instability of the retaining walls.A monitoring and warning system for the movement of masonry retaining walls and sway of trees has been designed with the application of fiber Bragg grating(FBG)sensing *** monitoring system is also equipped with a solar power system and 4G data transmission *** key functions of the proposed monitoring system include remote sensing and data access,early warning,and real-time data *** setups and working principles of the monitoring systems and related transducers are *** feasibility,accuracy,serviceability and reliability of this monitoring system have been checked by in-site calibration tests and four-month ***,a two-level interface has been developed for data *** monitoring results show that the monitored masonry retaining wall had a reversible movement up to 2.5 mm during the monitoring ***,it is found that the locations of the maximum strain on trees depend on the crown spread of trees.

关键词： Masonry retaining walls Tree Monitoring Fiber Bragg grating(FBG)sensing Warning system