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A hierarchical optimisation framework for pigmented lesion diagnosis

CAAI Transactions on Intelligence Technology 2022年第1期7卷 34-45页

作者： Audrey Huong KimGaik Tay KokBeng Gan xavier Ngu Department of Electronic Engineering Universiti Tun Hussein Onn MalaysiaParit RajaMalaysia Department of Electrical Electronic&Systems EngineeringUniversiti Kebangsaan MalaysiaBangiMalaysia Institute of Integrated Engineering Universiti Tun Hussein Onn MalaysiaParit RajaMalaysia

The study of training hyperparameters optimisation problems remains underexplored in skin lesion *** is the first report of using hierarchical optimisation to improve computational effort in a four-dimensional search space for the *** authors explore training parameters selection in optimising the learning process of a model to differentiate pigmented lesions *** the authors'demonstration,pretrained GoogleNet is fine-tuned with a full training set by varying hyperparameters,namely epoch,mini-batch value,initial learning rate,and gradient *** iterative search of the optimal global-local solution is by using the derivative-based *** authors used non-parametric one-way ANOVA to test whether the classification accuracies differed for the variation in the training *** authors identified the mini-batch size and initial learning rate as parameters that significantly influence the model's learning *** authors'results showed that a small fraction of combinations(5%)from constrained global search space,in contrarily to 82%at the local level,can converge with early stopping *** mean(standard deviation,SD)validation accuracies increased from 78.4(4.44)%to 82.9(1.8)%using the authors'*** fine-tuned model's performance measures evaluated on a testing dataset showed classification accuracy,precision,sensitivity,and specificity of 85.3%,75.6%,64.4%,and 97.2%,*** authors'system achieves an overall better diagnosis performance than four state-of-the-art approaches via an improved search of parameters for a good adaptation of the model to the authors'*** extended experiments also showed its superior performance consistency across different deep networks,where the overall classification accuracy increased by 5%with this *** approach reduces the risk of search being trapped in a suboptimal solution,and its use may be expanded to network architecture optimisation for

关键词： hierarchical hyperparameter optimisation pigmented lesion search

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A European digital accelerometric database:statistical analysis of engineering parameters of small to moderate magnitude events

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Earthquake Engineering and Engineering Vibration 2014年第4期13卷 583-597页

作者： Carlos S.Oliveira Gerard Gassol xavier Goula Teresa Susagna Instituto Superior Técnico Universidade de Lisboa Institut Cartogràfic i Geològic de Catalunya

During the NERIES Project, an accelerometric database containing European digital information was developed. Besides event and station metadata, ground motion parameters, computed in a homogeneous manner, were assembled： PGA, PGV, AI, TD, CAV, H1 and PSV（f,5%）（19,961 components, 2629 events, 547 stations）. Merging small and moderate magnitude events produced a unique database capable of providing important information such as：（i） Correlations between several ground motion parameters follow analogous trends as in previous worldwide datasets, with slight corrections. （ii） Although PGA attenuations with distance show great uncertainties, four recent GMPEs recommended for Europe fit quite well the central 50% data interval for the distance range 10 〈 R 〈 200 kin; outside these distances, they do not fit. （iii） Soil amplification ratios indicate that weak motion （low magnitudes and larger distances） shows larger amplification than strong motion （short distances and large magnitudes） as represented in UBC97 for the USA, but not in EC8 for Europe. （iv） Average spectral shapes are smaller than in the EC8. （v） Differences in amplification factors for PGA, PGV and HI for EC8 soil classes B and C, and differences in spectral shapes for these soil classes, indicate that EC8, Type 2 S-coefficient should be frequency dependent, as in UBC97.

关键词： NERIES project parametric accelerometric database European region PGA EC8 soil amplification

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Experimental Study of Corner Stall in a Linear Compressor Cascade

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Chinese Journal of Aeronautics 2011年第3期24卷 235-242页

作者： MA Wei OTTAVY xavier LU Lipeng LEBOEUF Francis GAO Feng Laboratoire de Mecanique des Fluides et d'Acoustique Ecole Centrale de Lyon Ecully 69134 France School of Jet Propulsion Beihang University Beijing 100191 China

In order to gain a better knowledge of the mechanisms and to calibrate computational fluid dynamics （CFD） tools including both Reynolds-averaged Navier-Stokes （RANS） and large eddy simulation （LES）, a detailed and accurate experimental study of comer stall in a linear compressor cascade has been carried out. Data are taken at a Reynolds number of 382 000 based on blade chord and inlet velocity. At first, inlet flow boundary layer is surveyed using hot-wire anemometry. Then in order to investigate the effects of incidence, measurements are acquired at five incidences, including static pressures on both blade and endwall sur- faces measured by pressure taps and the total pressure losses of outlet flow measured by a five-hole pressure probe. The maxi- mum losses as well as the extent of losses of the comer stall are presented as a function of the investigated incidences.

关键词： comer separation compressor cascades incidence hot-wire anemometry computational fluid dynamics

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Measurement of electrical charges carried by airborne bacteria laboratory-generated using a single-pass bubbling aerosolizer

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Particuology 2015年第1期13卷 179-185页

作者： xavier Simon Sébastien Bau Denis Bémer Philippe Duquenne Institut National de Recherche et de Securite(INRS)

Widely used bioaerosol generators like Collison nebulizer probably produce electrostatically charged par- ticles, but the electrical charges carried by laboratory-generated airborne microorganisms using bubbling aerosolizers are poorly understood. In this study, we measured the fraction of neutral particles and num- ber of elementary charges per particle as a function of the aerodynamic diameter of airborne bacteria （Escherichia coli and Enterococcus hirae）. Bioaerosols were produced by a liquid sparging aerosolizer-type bubbling generator, with particle sizes ranging from roughly 0.6 to 2 p^m. The experimental setup included an electrostatic precipitator and real-time devices including an electrometer, aerodynamic particle sizer, and electrical low-pressure impactor. Experimental results obtained for various operating conditions showed that aerosols produced with a higher bubbling airflow contained a larger proportion of neutral particles （from around 30% to 50%） and that bacteria carried a greater average absolute number of elementary charges （from around -10 to -60 elementary units） than those under lower airflow. Under the investigated conditions, a neutralization step is unnecessary because it may have a negative effect on the viability of sensitive microorganisms. Our results suggest that the neutral fraction can be used down- stream of an electrostatic precipitator, and that this setup may have advantages over bipolar neutralizers.

关键词： Bubbling generator Bioaerosol Electrical charge Electrostatic precipitator Escherichia coil Enterococcus hirae

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利于系统服务的负荷控制优化及需求响应机制推广（英文）

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中国电机工程学报 2014年第22期34卷 3608-3614页

作者： xavier YANG 法国电力集团研究总院法国克拉玛92141

该文主要介绍法国电力集团(Electricity of France,EDF)在负载控制优化和智能需求响应机制方面的电力系统服务。在EDF主导下,法国已积累成功的需求响应应用经验,其先进的电价体系及工业负载控制方案已超过几十年的应用历史。在电价激励... 详细信息

该文主要介绍法国电力集团(Electricity of France,EDF)在负载控制优化和智能需求响应机制方面的电力系统服务。在EDF主导下,法国已积累成功的需求响应应用经验,其先进的电价体系及工业负载控制方案已超过几十年的应用历史。在电价激励政策方面,EDF具备应用分时电价的悠久历史。法国在1965年就开始设计和推广激励电价体系,在过去10年间,又引入并推广了动态电价系统。作为需求和响应的重要组成部分,直接负荷控制是一种基于利润的负荷管理系统。法国已利用电力线载波(power line carrier,PLC)通信技术实现全国范围内对部分用户负荷直接进行管理。需求响应的主要目标是促进双赢的调峰解决方案,以大幅降低甩负载率为用户提供良好的电能质量。经过50多年的努力,法国国家总负荷曲线已大为改善。法国智能电网的最新发展主要包括智能配电和智能用电2个方面。Linky是法国电力公司推出的新一代唯一的智能电表系统,设计宗旨是为实现更多更优的需求响应及电网自动化功能。

关键词：需求响应直接负荷控制调峰切负荷动态电价智能电表

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Effect of garlic peel on growth,hematological parameters and disease resistance against Aeromonas hydrophila in African catfish Clarias gariepinus(Bloch) fingerlings

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Asian Pacific Journal of Tropical Medicine 2010年第8期3卷 614-618页

作者： Karthik Thanikachalam Marimuthu Kasi xavier Rathinam Department of Biotechnology Faculty of Applied SciencesAIMST UniversityMalaysia

Objective:To evaluate the efficacy of dietary doses of garlic(Allium sativum L.) peel on the hematological and disease resistance of African catfish[Glorias gariepinus(***)] fingerlings against the infections caused by opportunistic bacterial pathogen Aeromonas ***:Powdered garlic peel was incorporated into the diets at(0%,0.5%,1.0% and 1.5%) and fed to catfish fingerlings for 20 *** the feeding trial,biochemical(serum total protein,albumin and globulin),hematological parameters(white blood cells and red blood cells) of the fish were *** were challenged with Aeromona hydrophila(***) after 20 days of post feeding and percentage mortalities were recorded up to 10 days after post ***:Enhanced serum protein,albumin and globulin in fish fed with all the dosages of garlic peel when compared to control *** highest red blood cell and white blood cell counts were recorded in garlic peel incorporated diet fed groups compared to control *** results also demonstrate that low survival rate(55.5±11.0)%in control groups and significantly higher survival rates were recorded in all the garlic peel fed groups after challenging with *** no significant impact was noticed with regard to body weight gain,specific growth rate and food conversion ratio of fish fed with different levels of garlic peel inclusion and control ***:These results indicate that garlic peel enhances the hematological parameters even at a low level(0.5%) incorporation and makes C. gariepinus highly immunopotent and more resistant to infection by ***.

关键词： Garlic peel Disease resistance Clarias gariepinus

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Spectroscopic studies of gel-grown lanthanum malonate crystals

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Journal of Rare Earths 2012年第3期30卷 245-249页

作者： Varghese Mathew Sabu Jacob Lizymol xavier K.E.Abraham Department of Physics St.Aloysius'CollegeEdathua-689573India Department of Physics S.B.CollegeChanganacherry-686101India

Lanthanum malonate crystals were grown by single tube ionic diffusion through silica gel. The crystallinity of the grown crystals was analyzed by powder X-ray diffraction studies. Fourier transform infrared spectroscopy （FTIR） and fourier transform （FT） Raman studies confirmed the presence of functional groups in the title compound. The optical band gap energy of the material was extracted from diffuse reflectance spectrum.

关键词： lanthanum malonate crystal growth X-ray diffraction analysis DRS studies FTIR and FT Raman studies rare earths

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Laser Measurements in High Speed Compressors for Rotor-Stator Interaction Analysis

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Journal of Thermal Science 2003年第4期12卷 310-317,309页

作者： xavier Ottavy Isabelle Trébinjac André Vouillarmet David Arnaud Laboratoire de Mecanique des Fluides et d'Acoustique UMR CNRS 5509/ECL/UCB Lyon I Ecole Centrale de Lyon 36 Avenue Guy de Collongue 69134 ECULLY Cedex France

This paper deals with the experimental quantification of the unsteady effects of the interactions between rotor and stator rows in high speed compressors. Due to the fact that the levels of the periodic fluctuations arising from the unsteady interaction may be low compared with the random fluctuations arising from the measurement uncertainties, it is crucial to minimize the errors inherent to the used technique. The first part of the paper concentrates on technical details relative to the experimental process. The second part is devoted to the data post-processing. Two tools for analysing the rotor-stator interactions are presented. The first tool is based on a decomposition of the flow field which was initially introduced to solve numerical problems when attempting to calculate the flow field in a multi-row configuration. The second tool is based on a spectral analysis of the signal, that qualifies the interaction in a sense of circumferential spinning lobes. Experimental results obtained within both an axial and a centrifugal high speed compressors are used to illustrate the data processing. In both cases, the effects of the unsteady interaction are quantified.

关键词： laser anemometry high speed compressor rotor-stator interaction.

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Ultra-low loss silicon nitride becomes even cooler

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Light(Science & Applications) 2024年第10期13卷 1997-1999页

作者： Dawn T.H.Tan xavier X.Chia Photonics Devices and Systems Group Singapore University of Technology andDesignSingaporeSingapore institute of Microelectronics Agency for Science Technology and Research(A*STAR)SingaporeSingapore

Ultra-low loss silicon nitride realized using deuterated precursors and low thermal budgets well within backend-of-line CMOS processing may accelerate widespread proliferation of their use.

关键词： low budget nitride

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The effects of step inclination and air injection on the water flow in a stepped spillway:A numerical study

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Journal of Hydrodynamics 2017年第2期29卷 322-331页

作者： Khadidja Kherbache xavier Chesneau Belkacem Zeghmati Stéphane Abide Saadia Benmamar Universite de Perpignan Via Domitia(UPVD) LAhoratoire the Mathematiques et de PhySique(LAMPS)EA4217F-66860PerpignanFrance Ecole Nationale Polytechnique Laboratoire de Recherche des Sciences de I'eau10 Avenue Hassen Badi16000 AlgerAlgerie

In this work, we perform a numerical study of a water flow over a stepped spillway. This flow is described by the Reynolds averaged Navier-Stokes equation （RANS） associated with the turbulence k - model. These equations are solved using a commercial software based on the finite volume scheme and an unstructured mesh. The air-water flow was modeled using volume of fluid （VOF） and multiphasic methods. The characteristics of the profile, etc.. We analyze the effects on the flow structure of the flow were investigated including the total pressure, the velocity steps and countermarch inclination, the air injection through the countermarch into the water flow and the dynamics water discharges. Results show that the inclination of the countermarch relative to the vertical and the air injection into the water flow increase the total pressure in the neighbourhood of the steps.

关键词： Stepped spillway turbulence air-water air injection volume of fluid (VOF) method multiphasic method

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