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Medical images classification for skin cancer using quantitative image features with optical coherence tomography

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Journal of Innovative Optical Health Sciences 2016年第2期9卷 8-16页

作者： Wei Gao Valery P.Zakharov Oleg O.Myakinin Ivan A.Bratchenko Dmitry N.Artemyev Dmitry V.Kornilin Department of Laser and Biotechnical Systems samara state aerospace university

Optical coherence tomography(OCT)is employed in the diagnosis of skin ***,quantitative image features extracted from OCT images might be used as indicators to classify the skin *** the present paper,we investigated intensity-based,texture-based and fractalbased features for automatically classifying the melanomas,basal cell carcinomas and pigment *** estimating equations were used to test for differences between the skin tumors.A modified p value of<0.001 was considered statistically *** increase of mean and median of intensity and significant decrease of mean and median of absolute gradient were observed in basal cell carcinomas and pigment nevi as compared with *** decrease of contrast,entropy and fractal dimension was also observed in basal cell carcinomas and pigment nevi as compared with *** results suggest that the selected quantitative image features of OCT images could provide useful information to differentiate basal cell carcinomas and pigment nevi from the *** research is warranted to determine how this approach may be used to improve the classification of skin tumors.

关键词： Optical coherence tomography skin tumor texture analysis fractal analysis differentiate box counting

Calculation of multi-layer plate damper under one-axial load

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Chinese Physics B 2016年第2期25卷 256-261页

作者：闫辉张露姜洪源 Alexander M.Ulanov School of Mechatronics Engineering Harbin Institute of Technology Harbin 150001 China samara state aerospace university Moskovskoe Shosse Samara 443086 Russia

A multi-layer damper with waved plates under one-axial load is considered. A method of theoretical calculation of its energy dissipation coefficient is proposed. An experimental research of own frequencies and vibration transfer ratios for different parameters of damper structure, harmonic vibration load and random load is performed. Results of this research are approximated by functions; it is possible to use these functions for the calculation of the damper too.

关键词： plate damper energy dissipation coefficient elastic-damping characteristics amplitude-frequencycharacteristics

Lifetime of metal rubber isolator with different vibration amplitudes

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Journal of Central South university of Technology 2005年第2期12卷 181-185页

作者：姜洪源夏宇宏敖宏瑞董春芳 A.M.Ulanov Department of Machine Design Harbin Institute of Technology Harbin 150001 China samara state aerospace university Samara 443086 Russia

The lifetime of metal rubber isolator and its characteristics during lifetime experiment were studied. The stepped-up test principle was adopted to study the lifetime of resonant frequency, the breakage form of metal rubber isolator was obtained, and the relation between the energy dissipation, resonant frequency and stiffness was obtained in (available) lifetime of the isolator. Furthermore, the reason for the changes of properties of metal rubber isolator was analyzed with contact model of metal rubber material. The results show that if the resonant amplitude is large, the stiffness of metal rubber isolator will be kept steadily for a long time, its resonant frequency will be stable and the effective working time in the protecting area will be long. The lifetime of metal rubber isolator is more than 1376 h in the experiment. The main failure forms of metal rubber isolator are accumulative wear and breaking of metal wires and spirals. In protecting area the metal rubber isolator can work effectively for a long time, and the effective working time depends on the concrete working condition.

关键词： isolator metal rubber lifetime vibration

COMPLEX OPTICAL CHARACTERIZATION OF MESHIMPLANTS AND ENCAPSULATION AREA

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Journal of Innovative Optical Health Sciences 2013年第2期6卷 3-10页

作者： VALERIY P.ZAKHAROV IVAN A.BRATCHENKO VLADIMIR I.BELOKONEV DMITRY V.KORNILIN OLEG O.MYAKININ samara state aerospace university samara 443086 Moskovskoe Shosse 34Russia samara Medical university samara 443099 Polevaya Street 80Russia

Complex investigation of mesh implants was per formed involving laser confocal microscopy,backscattered probing and OCT imaging *** growth of endomysium and fat tissue with microcirculation vessels was observed in the mesh encapsulation *** microscopy analysis shows that such pat hologies complications such as necrosis formation and microcavities were localized in the area near implant fibers with the size compatible with fiber *** the number of such formnations increase with the increase of the size,number and density of microdefects on the implant *** of mumerical sinulations show that it is possible to control implant installation up to the depth to 4mm with a help of bac kscattering *** applicability of OCT imaging for mesh implant control was *** two stage OCT image noise reduction algorithm,including empirical mode decomposition,was proposed for contrast increase and better abnormalities visualization by halving the signal-to-noise *** usage of backscattered probing and OCT allows to accurately ascertain implant and surrounding tissue conditions,which reduces the risk of relapse probability.

关键词： Encapsulation area laser confocal microscopy mathematical simulation OCT image

Model of homogenisation for analysing the effect of micrometre pore sizes on the elastic moduli of porous materials

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Acta Mechanica Sinica 2019年第5期35卷 1060-1066页

作者： A.F.Fedotov Department of Mechanics Samara State Technical UniversitySamara 443100Russian Federation

A homogenisation model for analysing the effect of micrometre pore sizes on the engineering moduli of elasticity of porous materials was *** the proposed model,the engineering coefficients of localization of total strains(LTS coefficients)are considered instead of the classical strain localization *** a pore,these coefficients represent the ratio of the sum of the strains in the volume of the pore to the sum of the strains in the volume of the porous *** estimate the elastic moduli of a material with an arbitrary pore size,it is sufficient to have information about the elastic moduli and the LTS coefficient of a material with one basic pore ***,in Eshelby's model of equivalent inclusion,a transition to LTS coefficient for material with arbitrary pore size is achieved,and its elasticity moduli are *** results for Young's modulus of porous titanium,with different sizes of spherical pores,completely conform with the experimental *** have obtained a model theoretic estimate of the upper bounds of Young's modulus of porous materials with infinitely small pore *** the spherical pores,the proposed assessment coincides with the upper limits of the Hashin-Shtrikman bounds.

关键词： Elastic moduli Porous material Pore sizes

Neumann＇s method for boundary problems of thin elastic shells

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Applied Mathematics and Mechanics(English Edition) 2017年第4期38卷 543-556页

作者： Y. S. NEUSTADT Department of Civil Engineering Samara State Architectural and Building University Samara 443001 Russia

The possibility of using Neumann＇s method to solve the boundary problems for thin elastic shells is studied. The variational statement of the static problems for the shells allows for a problem examination within the distribution space. The convergence of Neumann＇s method is proven for the shells with holes when the boundary of the domain is not completely fixed. The numerical implementation of Neumann＇s method normally requires significant time before any reliable results can be achieved. This paper suggests a way to improve the convergence of the process, and allows for parallel computing and evaluation during the calculations.

关键词： boundary problem thin elastic shell theory Neumann's method variational principle Korn's inequality distribution embedding theorem Green tensor

CALCULATION OF ELASTIC DAMPING CHARACTERISTICS OF ROTOR SUPPORT MADE OF METAL RUBBER MATERIAL UNDER VARIABLE LOADS

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Chinese Journal of Mechanical Engineering 2007年第6期20卷 33-37页

作者： JIANG Hongyuan YAN Hui AO Hongrui ALEXANDER M Ulanov School of Mechatronics Engineering Harbin Institute of Technology Harbin 150001 China Department of Aircraft and Engine Structure Design Samara State Aerospace University Samara 443086 Russia

A metal rubber（MR） dry friction damper was designed based on the load supported by the rotor. An experimental apparatus for obtaining hysteresis loops of support under the precession load was designed. The elastic-damping characteristics of the ring-shaped MR damper used as a rotor support under variable loads were presented by studying the hysteresis loops of the damper. The vibration rigidity and the energy dissipation coefficient were calculated from the hysteresis loops, based on the description of the deformation process of the MR element with simple structure in a dimensionless coordinating system. The calculation results showed that the energy dissipation coefficient in the inner of MR element and on the boundary between the damper and the frame of the rotor support were approximately equal. The comparison of the hysteresis loops for a precession load and a one-axial load indicated a large difference when the coefficient of the energy dissipation and the stiffness of the MR damper were concerned.

关键词： Rotor support Precession load Stiffness Energy dissipation coefficient Metal rubber

A Damping Characteristics Calculation Method of Metal Dry Friction Isolators

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Journal of Beijing Institute of Technology 2008年第2期17卷 173-177页

作者：姜洪源郝德刚夏宇宏 ULANOV A M PONOMAREV Yu K School of Mechatronics Engineering Harbin Institute of Technology School of Astronautics Harbin Institute of Technology samara state aerospace university Samara 443086Russia

The dry friction ring-type vibration isolator is considered as an isotropic continuous medium. A method of dry friction hysteresis loop calculation is proposed based on friction force analysis of contact beam. The friction force is modeled as an equivalent distributed moment to use the finite element method （FEM） to calculate the dry friction vibration isolator hysteresis loop, so the damping characteristics can be obtained. A comparison of the hysteresis loop calculation results and the experimental results shows the average relative error is 2.7 %, it proves the calculation method is feasible.

关键词： vibration isolator damping finite element method dry friction

Monitoring and modeling of urban sprawl through remote sensing and GIS in Kuala Lumpur, Malaysia

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Ecological Processes 2015年第1期4卷 165-174页

作者： Mukesh Singh Boori Maik Netzband Komal Choudhary Vít Voženílek Palacky university Olomouc 17.listopadu 5077146 OlomoucCzech Republic Geographical Institute Ruhr University BochumBochumGermany samara state aerospace university SamaraRussia

Introduction:Kuala Lumpur is currently experiencing a large-scale urban *** study explores a multi-buffer ring method to investigate the spatial and temporal dynamics of urban growth in the Kuala Lumpur metropolitan area by using Geographical Information Systems(GIS)and remote sensing imageries from1989 to ***:The first Landsat images from 1989,2001,and 2014 were classified with maximum likelihood classification to produce land cover maps and identify four types of land cover:urban/built-up,agriculture,forest,and ***,the area coverage for all the land use types at different points in time were measured and combined with distance from the city *** on,urbanization densities from the city center to the outside for every 1-km distance from 1 to 50 km are ***:City density on the distance of 5,8,15,20,and 30 km was very high in the years 1989 and ***,urban expansion shows fast and slow growth stages with high-speed growth shifting to the east side of the ***:In general,the population,traffic conditions,industrialization,and policy are the major factors thatinfluenced the urban expansion.

关键词： Urbanization Landsat Change detection Remote Sensing GIS