scholarly journals Algorithm for post-processing of tomography images to calculate the dimension-geometric features of porous structures

2021 ◽  
Vol 45 (1) ◽  
pp. 110-121
Author(s):  
M.V. Chukalina ◽  
A.V. Khafizov ◽  
V.V. Kokhan ◽  
A.V. Buzmakov ◽  
R.A. Senin ◽  
...  
Keyword(s):  
Ct Images ◽  
Optimal Filtering ◽  
Porous Structures ◽  
Post Processing ◽  
Model Data ◽  
Otsu Method ◽  
Image Generator ◽  
Determination Of Parameters ◽  
Selection Of

An algorithm for post-processing of the grayscale 3D computed tomography (CT) images of porous structures with the automatic selection of filtering parameters is proposed. The determination of parameters is carried out on a representative part of the image under analysis. A criterion for the search for optimal filtering parameters based on the count of "levitating stone" voxels is described. The stages of CT image filtering and its binarization are performed sequentially. Bilateral and anisotropic diffuse filtering is implemented; the Otsu method for unbalanced classes is chosen for binarization. Verification of the proposed algorithm was carried out on model data. To create model porous structures, we used our image generator, which implements the function of anisotropic porous structures generation. Results of the post-processing of real CT images containing noise and reconstruction artifacts by the proposed method are discussed.

scholarly journals Assessment of the competitiveness of catering companies

2020 ◽  
Vol 23 (9) ◽  
pp. 77-85
Author(s):  
Nataliia Kyrnis
Keyword(s):  
High Tech ◽  
Internal Factors ◽  
Approach Method ◽  
Methodological Approaches ◽  
Determination Of Parameters ◽  
Post Industrial ◽  
Optimal Evaluation ◽  
Selection Of

Modernization of the Ukrainian economy under the influence of global post-industrial trends mainstreams the priority of development of science-intensive, high-tech, innovative activities. Modernization creates the preconditions for strengthening competitive positions in the national and global markets. In modern conditions, the issue of assessing the competitiveness of catering companies is relevant. High competitiveness of the enterprise is the main condition of its activity and development. The purpose of the study is to assess the competitiveness of catering companies in the market of catering services in Ukraine. The study proposes methodological approaches to assessing the competitiveness of catering companies. Methodological approaches include continuity of monitoring, determination of parameters, indicators and criteria, selection of optimal evaluation methods. In the process of research the following methods were used: sociological survey, simple ranking, integrated assessment and factor method, system approach method. It was established that methodical approaches to assessing the competitiveness of catering companies include justification and development of a system of socio-economic indicators and criteria (product quality, quality of service, quality and organizational staff, efficiency, efficiency of personnel management, price). Methodological approaches include a set of indicators that form an integrated indicator of competitiveness. This indicator allows to consider objective differences in the dynamics of enterprises, the conditions of use of available resources in the process of forecasting and development of enterprises. A comprehensive diagnosis was carried out based on an integrated indicator of the competitiveness of restaurants on special orders (catering), during which it was determined that its level has a significant differentiation according to the indicators of the studied enterprises, which are due to both external and internal factors, which allows the development of strategic priorities and specific measures to develop the image of the enterprise and increase its competitiveness.

Integration of Expert System Into a CAD System of Springs

1987 ◽  
Author(s):  
Yu Jin ◽  
Liu Shihua ◽  
Qin Jing ◽  
Zhou Ji
Keyword(s):  
Mathematical Model ◽  
Expert System ◽  
Optimal Design ◽  
Structure Characteristic ◽  
Cad System ◽  
System Technique ◽  
Characteristic Features ◽  
Determination Of Parameters ◽  
Selection Of

Abstract By combining the reasoning design of the expert system with the analysis and calculation of spring based on a mathematical model and its optimal design, an intelligent spring CAD system has been established. The expert system technique is adopted for such non-calculating designing steps as the selection of scheme, the determination of parameters as well as for the development of the technological process, thus greatly strengthening the original CAD system of springs. This paper provides a detailed description of the function, structure, characteristic features and significance of the said system.

Selection of Adsorbents and Determination of Parameters for the Separation of Glucose, Fructose, Sucrose and Fructooligosaccharides

2010 ◽  
Vol 6 (6) ◽  
Author(s):  
Raquel Cristine Kuhn ◽  
Francisco Maugeri Filho
Keyword(s):  
Experimental Data ◽  
Active Carbon ◽  
The Other ◽  
Isothermal Kinetics ◽  
Nax Zeolite ◽  
Selection Step ◽  
Determination Of Parameters ◽  
Best Fit ◽  
Selection Of

This work aimed to describe the adsorption of sugars (glucose, fructose, sucrose and fructooligosaccharides) employing different adsorbents (celite, active carbon and NaX zeolite) by means of isothermal models. At the adsorbent selection step, the active carbon exhibited a higher affinity for the adsorption of fructooligosaccharides. On the other hand, the adsorbents NaX zeolite and celite presented the highest adsorption stability with glucose, giving values of 1.496 g glucose/g zeolite and 1.35 g glucose/g celite. Therefore, zeolite and celite were the adsorbents selected for the determination of isothermal kinetics and it was shown that the linear model (q*= k.C*) provided the best fit for the experimental data. The temperatures studied were 30, 40 and 50 °C, and the 50°C resulted in the highest partition coefficient (k) for glucose on celite, indicating that higher temperatures benefit sugar adsorption.

CURVATURE-BASED CORRECTION ALGORITHM FOR AUTOMATIC LUNG SEGMENTATION ON CHEST CT IMAGES

2014 ◽  
Vol 22 (01) ◽  
pp. 1-28 ◽  
Author(s):  
SHICHENG HU ◽  
KESEN BI ◽  
QUANXU GE ◽  
MINGCHAO LI ◽  
XIN XIE ◽  
...  
Keyword(s):  
Ct Images ◽  
Chest Ct ◽  
Smoothing Algorithm ◽  
Correction Algorithm ◽  
Lung Segmentation ◽  
Preliminary Step ◽  
Chest Computed Tomography ◽  
Optimal Values ◽  
Selection Of

In order to ameliorate the lung defects caused by missed juxtapleural nodules in lung segmentation on chest computed tomography (CT) images, we develop a Newton–Cotes-based smoothing algorithm (NCBS) which is used as a preliminary step to remove noises as many as possible. Next considering the crescent outline features of the lung, we propose a curvature-based correction algorithm (CBC) for the determination of the correction threshold. The application of the proposed algorithms is demonstrated in the process of lung segmentation and the experimental results on 25 real datasets are illustrated. Furthermore, some experiments are conducted to investigate the effects of the key parameters in CBC on the performances of lung segmentation so as to decide their optimal values. In addition, the CBC is compared with other methods analytically and experimentally. The overall results show that our proposed algorithm in lung segmentation excels the related methods on the capability of automatic selection of the correction threshold, as well as the performances of accuracy, efficiency and feasibility.

scholarly journals Selection of Main Engines for Hopper Suction Dredgers with the Use of Probability Models

2018 ◽  
Vol 25 (1) ◽  
pp. 70-76
Author(s):  
Damian Bocheński
Keyword(s):  
Normal Distribution ◽  
Load Distribution ◽  
Probabilistic Models ◽  
Original Method ◽  
Probability Models ◽  
Determination Of Parameters ◽  
Design Power ◽  
Selection Of

Abstract This paper presents a new original method of selection of main engines for hopper suction dredgers with regard to probabilistic models. It was proposed to use the normal distribution to describe the operational loads of the main receivers. The principles for determination of parameters of load distribution and design power of the main engines were formulated. Lastly, the principles of selection of the size and number of main engines has been proposed.

scholarly journals Determination of parameters for selection of Eucalyptus clones tolerant to drought

2016 ◽  
Vol 11 (40) ◽  
pp. 3940-3949 ◽  
Author(s):  
Marie de Araujo Silva Inae ◽  
Willian Rocha de Souza Michael ◽  
Caroliny Pinto Rodrigues Any ◽  
Paulo de Sousa Correia Luiz ◽  
Von dos Santos Veloso Ronnie ◽  
...  
Keyword(s):  
Determination Of Parameters ◽  
Selection Of

scholarly journals Determination of parameters of mathematical model of quality assessment of surface waste treatment in urbanized territories

2019 ◽  
Vol 135 ◽  
pp. 01017
Author(s):  
Ekaterina Davydova ◽  
Arkadiy Kim ◽  
Alfiya Kapizova
Keyword(s):  
Mathematical Model ◽  
Wastewater Treatment ◽  
Waste Treatment ◽  
Surface Water Quality ◽  
Anthropogenic Pollutants ◽  
Wide Range ◽  
Optimal Technology ◽  
Determination Of Parameters ◽  
Selection Of

The publication presents the results of an analysis of the dynamics of changes in surface water quality in the Lower Volga basin based on the processing of statistical data on monitoring the degree of pollution over a long period. Significant all-season excesses of the maximum permissible norms for the concentration in water of a whole spectrum of background and anthropogenic pollutants were recorded. Deficiencies in the implementation of existing methods have been identified that make it possible to assess the dynamics of changes in the state of the ecosystem of the water basin and select the most significant parameters for constructing a mathematical model for choosing the most effective wastewater treatment technology.The aim of this work is to select and evaluate the input parameters of a mathematical model, the implementation of which will ensure the search for optimal technology and appropriate technical means of surface wastewater treatment. This research is based on a comprehensive assessment of a wide range of hydrochemical indicators of pollution of discharged wastewater in controlled sites using statistical methods for processing observational data. The most significant parameters have been identified that allow the formation of a conceptual model, and the degree of their influence on the selection of optimal means and methods of wastewater treatment has been determined.

scholarly journals AUTOMATIC METHOD DETERMINATION OF PARAMETERS STRATEGY OF DIVERGENCE OF VESSELS BY THEIR COURSES CHANGE

2020 ◽  
Vol 30 (1) ◽  
pp. 135-143
Author(s):  
D.B. Fedorov ◽  
◽  
◽  
◽  
Keyword(s):  
Traffic Control ◽  
Automatic Determination ◽  
Differential Game Theory ◽  
Line Parallel ◽  
Relative Coordinates ◽  
External Management ◽  
Determination Of Parameters ◽  
Computer Imitation ◽  
Selection Of

In the publication is specified, that providing of safe divergence of vessels at sailing in the straitened waters is one of most the issue of the day of accident-free of navigation. Therefore, straitened districts of sailing with especially intensive motion for the control of process of navigation by the stations of traffic control of vessels which for providing of safe divergence of vessels must dispose by modern facilities of warning of collision of vessels, reducing influencing of human factor of operator by the use of methods of automatic determination of strategy of divergence of vessels at their external management. Actuality of development of method of automatic determination of parameters of strategy of divergence of vessels by the change of their courses is determined to these. The analysis of the last achievements and publications is resulted in work, the decision of the considered problem and selection of parts unsolved before is begun in which. It is shown that for the decision of problem of warning of collisions of vessels was used method of nonlinear integral invariance, methods of theory of optimum discrete processes, and also methods of differential game theory. The method of warning of collision of vessels by displacement on a line parallel of way of ship and method of flexible strategies of divergence of vessels got development, allowing to form optimum strategy of divergence of ship with a few dangerous targets taking into account substantial factors. The publication contains analytical dependence of values of courses of deviation of vessels providing their divergence on minimum - possible distance of rapprochement, without taking into account inertia. It is specified, that for optimum of maneuver of divergence is needed, that increases of courses and were minimum, and as the criterion of optimum the sum of their squares is chosen. It is shown that without taking into account inertia of ship at a turn distance of the shortest rapprochement appears less minimum-possible distance on a size which depends on the increase of relative coordinates of vessels in times of turn and relative course of their deviation. Procedure of progressive approximations is offered for the calculation of courses of deviation of vessels taking into account their inertia and the algorithm of calculation of course of deviation is represented. Set by the values by the increases of courses from - 60° to 60°, the courses of deviation of the second ship settle accounts, which the courses of deviation of the first ship taking into account the dynamics of vessels and increase of his course are determined on. Every maneuver of divergence is characterized by the criterion of optimum, thus the maneuver of divergence gets out as optimum, at which the criterion of optimum is minimum. A situation is resulted in the publication, for which the computer imitation program expected the optimum courses of deviation of vessels. By the computer program, playing of maneuver of divergence of vessels with the got courses of deviation was produced.

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