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Research of thermal processes in industrial premises with energy-saving technologies of heating

Diagnostyka 2017年第2期18卷 43-49页

作者： Gumen, Olena Spodyniuk, Nadiia Ulewicz, Malgorzata Martyn, Yevgen National Technical University of Ukraine Igor Sikorsky Kyiv Polytechnic Institute Department of Descriptive Geometry Engineering and Computer Graphics Peremohy pr. 37 Kyiv03056 Ukraine Lviv Polytechnic National University Department of Heat and Gas Supply and Ventilation St. Bandery 12 Lviv - 1379013 Ukraine Czestochowa University of Technology Department of General Building Engineering and Building Physics Akademicka 3 Czestochowa42-201 Poland Lviv State University of Life Safety Department of Project Management Information Technologies and Telecommunications Kleparivska 35 Lviv - 0779007 Ukraine

The article presents the results of experimental research of thermal processes in industrial premises with energy-saving technologies of heating and their analysis by geometric modeling tools and graphic computer technologies. The effectiveness of using the method of forced feeding of air heated by infrared emitter involving compromise graphical optimization was analyzed by geometric way.

关键词： geometry

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Micromorphology of AlN Epilayers on Sapphire Substrates

Micromorphology of AlN Epilayers on Sapphire Substrates

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2017 International Conference on Computer, Electronics and Communication engineering(CECE2017)

作者： ?tefan ??LU Dinara SOBOLA Pavel TOMáNEK Sebastian STACH Technical University of Cluj-Napoca Faculty of Mechanical Engineering Department of AETDiscipline of Descriptive Geometry and Engineering Graphics Brno University of Technology Faculty of Electrical Engineering and Communication Physics Department University of Silesia Faculty of Computer Science and Materials Science Institute of InformaticsDepartment of Biomedical Computer Systems

The purpose of this paper was to describe the 3 D nano-scaled surface topography of the aluminum nitride on sapphire. The structures were prepared by magnetron sputtering with heating of the sapphire substrate. The dependence of the layers topography on the substrate temperature was presented. Surface appearance was studied by atomic force microscopy(AFM). The quantitative topography data from AFM were used for surface characterization by fractal analysis and statistical parameters. The results of fractal analysis show the correlation of fractal dimension and statistical characteristics of surface topography. The data may contribute to manufacture of AlN thin films with desired surface characteristics.

关键词： Aluminum nitride Atomic force microscopy Fractal analysis Minkowsky functionals Surface micromorphology

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Analysis of normal human retinal vascular network architecture using multifractal geometry

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International Journal of Ophthalmology(English edition) 2017年第3期10卷 434-438页

作者： Stefan Talu Sebastian Stach Dan Mihai Calugaru Carmen Alina Lupascu Simona Delia Nicoara Discipline of Descriptive Geometry and Engineering Graphics Department of AETFaculty of Mechanical EngineeringTechnical University of Cluj-Napoca103-105 B-dul Muncii St.Cluj-Napoca 400641ClujRomania Department of Biomedical Computer Systems Institute of InformaticsFaculty of Computer Science and Materials ScienceUniversity of SilesiaBedzifiska 3941-205 SosnowiecPoland Discipline of Ophthalmology Department of Surgical Speci-alties and Medical ImagingFaculty of Medicine'Iuliu Halie-ganu'University of Medicine and Pharmacy Cluj-Napoca8 Victor Babes St.Cluj-Napoca 400012ClujRomania Department of Mathematics and Informatics University of PalermoVia Archirafi 34Palermo 90123Italy

AIM：To apply the multifractal analysis method as a quantitative approach to a comprehensive description of the microvascular network architecture of the normal human ***：Fifty volunteers were enrolled in this study in the Ophthalmological Clinic of Cluj-Napoca,Romania,between January 2012 and January 2014. A set of 100 segmented and skeletonised human retinal images,corresponding to normal states of the retina were studied. An automatic unsupervised method for retinal vessel segmentation was applied before multifractal analysis. The multifractal analysis of digital retinal images was made with computer algorithms,applying the standard boxcounting method. Statistical analyses were performed using the Graph Pad In Stat ***：The architecture of normal human retinal microvascular network was able to be described using the multifractal geometry. The average of generalized dimensions（D_q）for q=0,1,2,the width of the multifractal spectrum（Δα=α_（max）-α_（min））and the spectrum arms＇ heights difference（│Δf│）of the normal images were expressed as mean±standard deviation（SD）：for segmented versions,D_0=1.7014±0.0057; D_1=1.6507±0.0058; D_2=1.5772±0.0059; Δα=0.92441±0.0085; │Δf│= 0.1453±0.0051; for skeletonised versions,D_0=1.6303±0.0051; D_1=1.6012±0.0059; D_2=1.5531± 0.0058; Δα=0.65032±0.0162; │Δf│= 0.0238±0.0161. The average of generalized dimensions（D_q）for q=0,1,2,the width of the multifractal spectrum（Δα）and the spectrum arms＇ heights difference（│Δf│）of the segmented versions was slightly greater than the skeletonised ***：The multifractal analysis of fundus photographs may be used as a quantitative parameter for the evaluation of the complex three-dimensional structure of the retinal microvasculature as a potential marker for early detection of topological changes associated with retinal diseases.

关键词： generalized dimensions multifractal retinal vessel segmentation retinal image analysis retinal microvasculature standard box-counting method

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Characterization of human retinal vessel arborisation in normal and amblyopic eyes using multifractal analysis

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International Journal of Ophthalmology(English edition) 2015年第5期8卷 996-1002页

作者： Stefan Tǎlu Cristina Vlǎdutiu Carmen A.Lupascu Discipline of Descriptive Geometry and Engineering Graphics Department of Automotive Engineering and TransportationFaculty of Mechanical EngineeringTechnical University of Cluj-Napoca Discipline of Ophthalmology Department of Surgical Specialties and Medical ImagingFaculty of Medicine"Iuliu Hatieganu" University of Medicine and Pharmacy Cluj-Napoca Department of Mathematics and Informatics University of Palermo

AIMTo characterize the human retinal vessel arborisation in normal and amblyopic eyes using multifractal geometry and lacunarity *** analysis using a box counting algorithm was carried out for a set of 12 segmented and skeletonized human retinal images, corresponding to both normal (6 images) and amblyopia states of the retina (6 images).RESULTSIt was found that the microvascular geometry of the human retina network represents geometrical multifractals, characterized through subsets of regions having different scaling properties that are not evident in the fractal analysis. Multifractal analysis of the amblyopia images (segmented and skeletonized versions) show a higher average of the generalized dimensions (D_q) for q=0, 1, 2 indicating a higher degree of the tree-dimensional complexity associated with the human retinal microvasculature network whereas images of healthy subjects show a lower value of generalized dimensions indicating normal complexity of biostructure. On the other hand, the lacunarity analysis of the amblyopia images (segmented and skeletonized versions) show a lower average of the lacunarity parameter Λ than the corresponding values for normal images (segmented and skeletonized versions).CONCLUSIONThe multifractal and lacunarity analysis may be used as a non-invasive predictive complementary tool to distinguish amblyopic subjects from healthy subjects and hence this technique could be used for an early diagnosis of patients with amblyopia.

关键词： retina retinal vessels amblyopia strabismus multifractals lacunarity

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Characterisation of human non-proliferative diabetic retinopathy using the fractal analysis

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International Journal of Ophthalmology(English edition) 2015年第4期8卷 770-776页

作者： Stefan Tǎlu Dan Mihai Cǎlugǎru Carmen Alina Lupascu Discipline of Descriptive Geometry and Engineering Graphics Department of AET Faculty of Mechanical Engineering Technical University of Cluj-Napoca Discipline of Ophthalmology Department of Surgical Specialties and Medical Imaging Faculty of Medicine Iuliu Hatieganu University of Medicine and Pharmacy Cluj-Napoca Department of Mathematics and Informatics University of Palermo

· AIM: To investigate and quantify changes in the branching patterns of the retina vascular network in diabetes using the fractal analysis method.·METHODS: This was a clinic-based prospective study of 172 participants managed at the Ophthalmological Clinic of Cluj-Napoca, Romania, between January 2012 and December 2013. A set of 172 segmented and skeletonized human retinal images, corresponding to both normal(24 images) and pathological(148 images)states of the retina were examined. An automatic unsupervised method for retinal vessel segmentation was applied before fractal analysis. The fractal analyses of the retinal digital images were performed using the fractal analysis software Image J. Statistical analyses were performed for these groups using Microsoft Office Excel2003 and Graph Pad In Stat software.·RESULTS: It was found that subtle changes in the vascular network geometry of the human retina are influenced by diabetic retinopathy(DR) and can be estimated using the fractal geometry. The average of fractal dimensions D for the normal images(segmented and skeletonized versions) is slightly lower than the corresponding values of mild non-proliferative DR(NPDR) images(segmented and skeletonized versions).The average of fractal dimensions D for the normal images(segmented and skeletonized versions) is higher than the corresponding values of moderate NPDR images(segmented and skeletonized versions). The lowestvalues were found for the corresponding values of severe NPDR images(segmented and skeletonized versions).· CONCLUSION: The fractal analysis of fundus photographs may be used for a more complete understanding of the early and basic pathophysiological mechanisms of diabetes. The architecture of the retinal microvasculature in diabetes can be quantitative quantified by means of the fractal *** abnormalities on retinal imaging may elucidate early mechanistic pathways for microvascular complications and distinguish patients with DR from health

关键词： diabetic retinopathy fractal fractal dimension retinal image analysis retinal microvasculature

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Micromorphological characterization of polymer-oxide nanocomposite thin films by atomic force microscopy and fractal geometry analysis

Micromorphological characterization of polymer-oxide nanocom...

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作者： Ţəlu, Ştefan Patra, Niranjan Salerno, Marco Technical University of Cluj-Napoca Faculty of Mechanical Engineering Department of AET Discipline of Descriptive Geometry and Engineering Graphics 103-105 B-dul Muncii St. Cluj-Napoca Cluj400641 Romania Istituto Italiano di Tecnologia Nanophysics Department Scanning Probe Microscopy Lab via Morego 30 GenovaI-16163 Italy Imperial College Faculty of Engineering Department of Materials LondonSW7 2AZ United Kingdom

The purpose of this study was to evaluate the 3-D surface micromorphology of polymer-oxide thin films spin-coated from a composite of poly-methyl-methacrylate as the matrix and elongated titania nanorods as the filler particles. The surfaces of these composite films were investigated by atomic force microscopy and characterized by fractal geometry analysis. The effect of increasing loading of the fillers between 0 and 30% by weigth relative to the matrix was assessed. An increasing roughness was observed, with typical emergence of protruding ripples progressively extending into larger stripes. The amplitude parameters of the surfaces were determined by analysis of the height distributions. The fractal analysis of roughness revealed that the films have fractal geometry. Triangulation method based on the linear interpolation type was applied to determine the fractal dimension. A connection was observed between the surface morphology and the physical properties of the coatings as assessed in previous works. © 2015 Elsevier B.V. All rights reserved.

关键词： Atomic force microscopy

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Automatic extraction of salient objects in 3D stereoscopic videos

Automatic extraction of salient objects in 3D stereoscopic v...

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International Symposium on Electronics and Telecommunications (ISETC)

作者： Ruxandra Tapu Bogdan Mocanu Ermina Tapu Department of Telecommunications University “Politehnica” of Bucharest Bucharest Romania Dept. of Descriptive Geometry and Engineering Graphics University “Politehnica” of Bucharest Romania

For 3D stereoscopic videos the depth perception represents an important factor that affects the human visual attention much more than any motion or texture contrast existent in a traditional 2D videos. In this context, the present paper addressed the issue of stereoscopic visual attention models designed to detect salient objects in 3D videos. We propose representing the image sequence as a 2D video stream and its associated depth maps. The technique starts by combining a spatiotemporal attention model with a disparity map. The depth map offers important information about the objects position in space and helps us estimating their relative distance to the video camera. The proposed method is evaluated on a set of ten 3D video streams and can be considered efficient and robust.

关键词： Videos Visualization Three-dimensional displays Spatiotemporal phenomena Stereo image processing Streaming media Cameras

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Salient object detection in video streams

Salient object detection in video streams

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International Symposium on Electronics and Telecommunications (ISETC)

In this paper we propose a complete framework for automatic detection and tracking of salient objects in video streams. The video flow is firstly segmented into shots based on scale space filtering graph partition method. For each detected shot the associated static summary is developed using a leap keyframe extraction method. Based on the representative images we introduce next a combined spatial and temporal video attention model that is able to recognize both interesting objects and actions in image sequences. The approach extends the state-of-the-art image region based contrast saliency with a temporal attention model. Different types of motion presented in the current shot are determined using a set of homographic transforms, estimated by recursively applying the RANSAC algorithm on the interest point correspondence. Finally, a decision is taken based on the combined information from both saliency maps. The experimental results validate the proposed framework and demonstrate that our approach is suitable for various types of videos and is robust to noise and low resolution.

关键词： Visualization Humans Computational modeling Streaming media Spatiotemporal phenomena Cameras Transforms

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Postnatal Development of the Retina in Rats Exposed to Hyperoxia: A Fractal Analysis

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International Scholarly Research Notices 2013年第1期2013卷

作者： Anne Claudia Ştefănuţ Ştefan Ţălu Viorel Miclăuş Adriana Mureşan Remus Moldovan Bianca Szabo Clinic Emergency Hospital Cluj-Napoca 3-5 Clinicilor Street 400006 Cluj-Napoca Romania Technical University of Cluj-Napoca Faculty of Mechanical Engineering Department of AET Discipline of Descriptive Geometry and Engineering Graphics 103-105 B-dul Muncii Street 400641 Cluj-Napoca Romaniautcluj.ro University of Agricultural Sciences and Veterinary Medicine Faculty of Veterinary Medicine Department of Cell Biology Histology and Embriology 3-5 Mănăştur Street 400372 Cluj-Napoca Romania “Iuliu Haţieganu” University of Medicine and Pharmacy Cluj-Napoca Faculty of Medicine Department of Physiology 1 Clinicilor Street 400006 Cluj-Napoca Romania “Iuliu Haţieganu” University of Medicine and Pharmacy Cluj-Napoca Faculty of Medicine Department of Anatomy Embryology Ophthalmology 3-5 Clinicilor Street 400006 Cluj-Napoca Romania

Purpose . The aim of this study was to investigate and quantify changes in the newborn rats retinal layers during the hyperoxia (80% O 2 ) exposure using fractal analysis. Materials and Methods . This study was conducted on two groups of 20 newborn rats: a control (normal) group (10 rats) and an experimental group (10 rats). The control group was composed of 10 newborn rats, which were placed at 12 hours after birth, in a pediatric incubator, together with their mother, in conditions of normoxia for 21 days. The experimental group consisted of 10 newborn rats, which were placed at 12 hours after birth, in a pediatric incubator with their mother, in conditions of normoxia for 7 days, then 7 days of hyperoxia (80% O 2 ) for 22.5 hours/day, and then 7 days in conditions of normoxia. Slaughtering of the rats was performed on day 21 and the eye globes were harvested in order to perform histopathological examinations. The fractal analyses of the retinal digital images were performed using the fractal analysis software Image J, and the fractal dimensions were calculated using the standard box-counting method. Results . Microscopic examination revealed a normal development of the retina in the control group. In the experimental group, all the animals exposed to hyperoxia revealed both structural and vascular abnormalities on entire retina. Conclusions . The results showed that the fractal analysis is a valuable tool to quantify histoarchitectural changes in the newborn rats retinal layers during the hyperoxia (80% O 2 ).

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Modeling of a drawing in three-dimensional space using CAD system

Modeling of a drawing in three-dimensional space using CAD s...

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作者： Georgeta, Haraga Daniela, Ghelase Luiza, Daschievici Descriptive Geometry and Engineering Graphics Department Politehnica University of Bucharest Splaiul Independentei 313 Bucharest 060042 Romania

ISBN: (纸本)9789604742301

This paper refers to three-dimensional modeling of a drawing in Solid Edge software using a 2d sketch. For 3D modeling of a drawing we need a profile that represents a combination of a number of two-dimensional entities such as lines, arcs, circles, rectangles, and so on. In this article we will highlight the ease of using basic commands in creating a 3D drawing in Solid Edge Draft and Solid Edge Part environments. We insist on how to make threads in three-dimensional space and on automatic extraction of views or sections of the selected 3D model. Toward the end of the paper we point the importance of using Material Table command to change the material and its properties of the proposed 3D model.

关键词： Computer aided design

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