scholarly journals Features for making decisions in the interests of organizing transport processes

2021 ◽  
Vol 296 ◽  
pp. 06030
Author(s):  
G.I. Moskvitin ◽  
A.B. Pismennaya ◽  
P.N. Abroskin ◽  
V.V. Korsakova
Keyword(s):  
Rational Solution ◽  
Target Function ◽  
Transport Processes ◽  
Mathematical Methods ◽  
Scientific Methods ◽  
Single Indicator ◽  
Difficult Situations

The practice of management activities suggests that the experience and knowledge of managers alone cannot always provide an optimal or even rational solution without additional scientifically grounded methods for assessing the effectiveness of possible options for organizing transport processes. All this generated a need for the development of scientific methods for making (developing, supporting, justifying) decisions that would make it possible to develop specific recommendations for the head who manages the facility in difficult situations. These methods included the formation of effectiveness measures in the form of maximum or minimum of a single indicator — the target function with or without constraints and various algorithms for finding the values of arguments that provide the required value of this function. Subsequently, mathematical methods for solving multi-criteria problems involving different goals of the operation and using, respectively, a lot of alternative effectiveness measures began to develop.

scholarly journals MATHEMATICAL MODELING OF THE COVERING OPTIMIZATION OF THE ROUND BUILDINGS IN A PLAN WITH A RADIAL BEAM POSITION

2021 ◽  
pp. 139-147
Author(s):  
A.E. Yanin ◽  
◽  
S.N. Novikova ◽  
Keyword(s):  
Target Function ◽  
Numerical Data ◽  
Mathematical Methods ◽  
Beam Position ◽  
Value Analysis ◽  
Optimal Angle ◽  
Minimum Value ◽  
Target Cost ◽  
Radial Beam ◽  
Strength And Stiffness

The article presents the results of optimization of the angle between radial beams in the floor of a circular building in the plan. On the one hand, they rest on the central post, and on the other, on vertical supporting structures along the circle. Steel decking is laid on the beams. The angle between the beams is determined so that the mass of the beam and the deck is minimal. This angle is considered optimal. To solve the problem, the target function of the cost of flooring and radial beams per unit floor area is used. This function depends on the angle between the beams. Using mathematical methods of differentiation, the minimum of the objective function and the corresponding value of the optimal angle were found. The thickness of the flooring was determined on the basis of ensuring its rigidity. It is assumed that composite welded radial beams have I-beams with two axes of symmetry. The height of the beam corresponds to the equality of the areas of the shelves and the wall. The problem of determining the optimal angle between the beams was solved on the basis of ensuring the strength of the beams under normal stresses. In the design diagram of the beam, a triangular distributed load is adopted. The dimensions of the cross-section of the beam were determined based on the equality of the required and actual moments of resistance, and were included in the target cost function. The study took into account that the deflection of the beam at the optimal angle between them can exceed the limiting standard value. Based on the solution of the system of equations of strength and stiffness, a formula is obtained for the minimum angle between the beams from the stiffness condition. The carried out mathematical studies have shown that at the optimal angle between the beams, it is possible to ensure its rigidity. This is possible when the flexibility of the beam wall exceeds a certain minimum value. Analysis of the formula for the minimum value of the wall flexibility showed that it is proportional to the design steel resistance to the sixth power. Therefore, to ensure that the deflection of the beam does not exceed the limiting value at the optimum angle, it is necessary to use low strength steel. To confirm the practical feasibility of using the proposed method, the problem was solved with certain numerical data. The results obtained have confirmed that the problem has a practical meaning at a relatively low steel strength. In addition, it turned out that the optimal angle between the beams does not depend on its span.

scholarly journals THE USE OF PROGRESSIVE GRAVITATIONAL METHODS IN THE LOGISTICS OF RAIL PASSENGER TRANSPORT

2021 ◽  
Vol 8 (1) ◽  
pp. 19-25
Author(s):  
Milan Dedík ◽  
Karol Hrudkay ◽  
Adrián Šperka
Keyword(s):  
Practical Knowledge ◽  
Theoretical Concept ◽  
Transport Processes ◽  
Passenger Transport ◽  
Railway Transport ◽  
Empirical Methods ◽  
Theoretical Formulation ◽  
Scientific Methods ◽  
Railway Passenger Transport ◽  
Railway Passenger

The main strategic goal of EU transport policy is to support public passenger transport and railway transport as a key transport mode. It is also very important to develop and improve logistic processes in passenger transport. To meet these goals it is necessary to use professional and scientific methods, for example gravitational methods. These methods can be included among progressive empirical methods and models that are used to generalize specific results and offer a general solution to the problem, from practical knowledge to theoretical formulation. These methods are utilised in the natural sciences but their using in transport processes is very important too. One of the best known empirical methods are Nyvig´s and Lill´s gravitational methods. They are especially used in transport planning and organizing, determining of the traffic potential, optimization and rationalization of timetables and traffic service. In the contribution the authors deals with using of the current and new progressive gravitational methods in the context of rail passenger transport logistics. The first chapter comprises narrow connection of the logistics and rail passenger transport including the explanation of their function in rail passenger transport. The next chapter contains an analysis the current research of raised issues. The most important scientific part conssists of theoretical concept of the gravitational methods in railway passenger transport and its various modifications. Theoretical principles of the new progressive Lill´s gravitational model form including its practical application at the chosen railway passenger transport routes are explained and analyzed in the fourth and the fifth chapter.

scholarly journals Improving the Methodology for Calculating the Average Turnover of Gondola Cars of an Iron and Steel Plant

2020 ◽  
Vol 18 (1) ◽  
pp. 184-195
Author(s):  
A. T. Popov ◽  
A. S. Khmelev
Keyword(s):  
New Technologies ◽  
Steel Plant ◽  
Rolling Stock ◽  
Mathematical Methods ◽  
Metallurgical Enterprise ◽  
Iron And Steel ◽  
Scientific Methods ◽  
Important Quality ◽  
The Cost ◽  
Dual Operations

The average daily mileage of a wagon, its productivity and turnover determine the level of efficiency of rolling stock use. The car turnover is calculated and normalized not only for the fleet as a whole, but also for each type of rolling stock, for a particular region and road, depending on the nature of the transportation work. Accelerating car turnover increases its productivity and increases profit of an operator company. At the same time, its decrease negativ ely affects the capacity of the infrastructure, entails an increase in the cost of shunting and train work, which means that it will increase the cost of transportation. In modern conditions, turnover is determined for each participant in transportation in accordance with his area of responsibility. For an iron and steel plant, the use of an optimal methodology for recording the time spent by a wagon on its tracks allows us to adequately assess this important quality indicator, as well as to monitor its change as a result of introduction of new technologies for transport maintenance of workshops, reconstruction of station layout and optimization of the transportation process. The objective of the study is to improve the methodology for determining car turnover on access roads of a metallurgical enterprise for universal rolling stock in the context of dual operations. The authors use general scientific methods, mathematical methods, comparative analysis. This article presents the main provisions of the methodology, which will allow determining turnover of gondola cars subject to a single or dual operations in the form of a single indicator which is average weighted car turnover.

scholarly journals TO THE QUESTION OF THE APPLICATION OF MATHEMATICAL METHODS IN LEGAL SCIENCE

2019 ◽  
Vol 7 (2) ◽  
pp. 21-25
Author(s):  
Михаил Осипов ◽  
Mikhail Osipov
Keyword(s):  
Research Methods ◽  
Legal Regulation ◽  
Quantitative Aspect ◽  
Mathematical Methods ◽  
Qualitative Aspect ◽  
Scientific Methods ◽  
Legal Science ◽  
Scientific Potential ◽  
Binary Matrices ◽  
General Scientific

The problem of application of mathematical methods in legal science is one of the actual problems facing modern legal science. The urgency of this problem is connected with the recent appearance of a series of works devoted to the possibilities of applying mathematical methods in jurisprudence. The purpose of the study is to determine the possibilities of applying mathematical methods in legal science and to evaluate their possible scientific potential. The main objectives of the study include: identifying the specificity of the application of mathematical methods in legal science, determining the scientific potential of mathematical methods (identifying those patterns that can be identified using mathematical methods), determining the possible range of problems facing legal science solved with the help of mathematical methods. Among the research methods used in writing this article are: general scientific methods: analysis, synthesis, induction, deduction, abstraction, generalization; special methods: formally - legal and comparative - legal approach. In the course of the study it was concluded that the use of mathematical methods in legal science is possible when analyzing both the quantitative and qualitative aspects of legal phenomena. Moreover, if the quantitative aspect of legal phenomena can be investigated using the methods of mathematical statistics and classical mathematical methods, then the qualitative aspect of legal phenomena can be investigated using binary matrices. The study also showed the possibility of using binary matrices and classical mathematical methods in analyzing the effectiveness of legal regulation.

scholarly journals Methods of validation of the ballistic structure of space surveillance system orbital segment

2019 ◽  
Vol 18 (3) ◽  
pp. 155-165
Author(s):  
I. A. Fadin ◽  
S. V. Yanov ◽  
O. A. Samokhvalov
Keyword(s):  
Surveillance System ◽  
Space Debris ◽  
Target Function ◽  
Object Motion ◽  
Space Object ◽  
Scientific Methods ◽  
Optimization Task ◽  
Space Objects ◽  
The Russian Federation ◽  
Orbital Constellation

Space activity brought about the space debris problem that constitutes a threat to active spacecraft. Nowadays the most efficient way of spacecraft protection against space debris is choosing the appropriate orbit parameters to prevent collisions of space objects. To do this one should know the parameters of motion of space objects (SO). At present the task of determining SO orbit parameters is solved be means of the space surveillance system (SSS). The Russian space surveillance system includes only ground based facilities located on the territory of the Russian Federation and Tajikistan. This fact does not allow determining the parameters of SO motion over the Western and Southern Hemispheres. The task of monitoring SO in low orbits (up to 2000 km height) is of particular importance because there have already been collisions that generated a lot of debris which, in their turn, pose a new threat to Russian active spacecraft. To prevent prospective threats to the Russian orbital constellation associated with possible generation of new debris as a result of impacts or spontaneous separation (because of an explosion, for instance) of active SOs the parameters of motion of newly emerging space objects need to be determined quickly and efficiently. We propose to solve the task of online monitoring of space object motion by creating an orbital segment of SSS. The creation of the new system is to be preceded by the development of scientific methods for justification of its ballistic structure. This article presents a method based on the solution of an optimization task, where the target function is the dependence of the required number of measurer spacecraft on the quality indicators of space surveillance.

scholarly journals TRANSPORT TASK OF OPTIMIZATION OF COSTS WITH MULTIMODAL TRANSPORTATION

2017 ◽  
Vol 19 (2(64)) ◽  
pp. 157-163
Author(s):  
A.G. Kukharchyk
Keyword(s):  
Cost Optimization ◽  
Target Function ◽  
Optimization Criterion ◽  
Transport Problem ◽  
Mathematical Methods ◽  
Multimodal Transportation ◽  
Advantages And Disadvantages ◽  
Multimodal Transport ◽  
The Common ◽  
The Mathematical Model

In the article, the questions of cost optimization in solving the transport problem using mathematical models are considered. A group of criteria that have the greatest influence in solving the transport problem is determined. The mathematical model of the transport problem allows us to describe a multitude of situations that arise in multimodal transport. The formulation of the goal is optimization - a task more economical, on the other - knowledge of economic and mathematical methods can more effectively solve this problem. The rationale for choosing an optimization criterion is a procedure that cannot be fully formalized, it must be performed taking into account the performance of transport and the interrelationship between them. The common approach to choosing and justifying an optimization criterion is usually based on the following circumstance: as a criterion, only a measure that can be quantified is chosen. Most often, the justification of one indicator is taken as a criterion (characteristic) of the process, less often - a group of criteria, depending on which one speaks of tasks with one criterion or multicriteria. As can be seen from the above, each criterion of optimality has advantages and disadvantages, which most often result from the measure of the synthetic criterion, the difficulty of preparing information in the form an array of coefficients for unknowns in the target function, the narrower or broader scope of its application. The selection and justification of the optimization criterion are performed taking into account all these circumstances in each particular case. In conclusion, it should be noted that all of these criteria have meaning in such tasks, where the volume of traffic is predetermined.

scholarly journals Information Model for Global Shipbuilding in the Period of 2016 – 2020

2018 ◽  
Vol 7 (1) ◽  
pp. 95-101
Author(s):  
Vinko Vidučić
Keyword(s):  
Synergistic Effect ◽  
Information Model ◽  
Mathematical Methods ◽  
Scientific Methods ◽  
The World ◽  
Analysis And Synthesis ◽  
Direct Growth ◽  
Order Books ◽  
Market Variables ◽  
First Time

This study explores the worldwide demand for the newly built ships from 2014 to 2017 and produces forecasts for the demands concerning the years 2018 and 2020, on the basis of mental and verbal insights into the global shipping market, theoretical aspects of the issue, and the selected variables (South Korea, China, Japan, Europe and the Rest of the World) of the information model for the global shipbuilding. The value of the variables for the year 2016 has been achieved by taking into account the synergistic effect of the percentage obtained per order books across the world, gross tonnage in 0,000 GT and the value of vessels in billion US$ for each selected variable. In the next stage these values have been quantified based on the mental and verbal insights into the scientific aspects of the global shipping market variables of the information model for the global shipbuilding in the years of 2018 and 2020. In this way, for the first time, the growth matrix has produced the values of the selected variables, i.e. the direct growth rates of the information model for the global shipbuilding for the period 2018-2020. The research has involved a combination of scientific methods, among which the most relevant are analysis and synthesis, induction and deduction, descriptive, comparative, statistical and mathematical methods, method of model drawing (growth matrix), and methods of proving and refuting.

scholarly journals The formation mechanism of external effects of improving transport accessibility caused by high-speed rail devepolment

2020 ◽  
Vol 6 (4) ◽  
pp. 127-142
Author(s):  
Alexey S. Romanov ◽  
Maria A. Lyakina
Keyword(s):  
Formation Mechanism ◽  
High Speed ◽  
Transport Processes ◽  
Transport Systems ◽  
External Effects ◽  
High Speed Rail ◽  
Dual Nature ◽  
Scientific Methods ◽  
Transport Accessibility ◽  
Use Of Resources

Background: One of the current trends of modern transport systems development process is innovative technologies application aimed to rational use of resources, which is confirmed by the development of high-speed rail supposing to reduce travel time costs. The world practice of high-speed railway projects implementation verifies variety of transport availability influences on social and economic sphere that allows to consider HSR not only as the transport innovation defining competitiveness of railway transport, but also as the economic stimulation tool for territory development. Aim: to substantiate the formation mechanism of external effects from high-speed rail transport projects implementation. Methods: the study was conducted by means of scientific methods such as the systematic method, comparative analysis, analogy, generalization and abstraction, synthesis, induction. Results: the formation mechanism of external effects from the transport accessibility improving caused by HSR projects implementation was specified, which allows considering HSR projects as a tool for economic development. The dual nature of the relationship between the high-speed rail efficiency, which ensure the external effects formation, and integration transport processes that affect transport accessibility was revealed.

scholarly journals Modeling of Transport Processes in Terms of Seasonality of Transport

2019 ◽  
Vol 216 (1) ◽  
pp. 103-116
Author(s):  
Andrzej Świderski
Keyword(s):  
Road Transport ◽  
Time Of Day ◽  
Transport Processes ◽  
Mathematical Methods ◽  
Goods And Services ◽  
Transport Services ◽  
Potential Benefits ◽  
Individual Variables ◽  
The Impact ◽  
A Company

Abstract The company’s success depends on many factors. One of them is the ability to meet the customers’ expectations and adjust to the needs reported by market. Mathematical methods and tools are helpful in assessing demand. Forecasts should take into account all factors shaping the demand for goods and services, but they are often difficult to define, not only because of their large number, but also due to the impact of individual variables, which is difficult to determine. In many cases, the number of placed orders strongly depends on the time at which they are submitted. The needs can vary according to the time of day, week and year. Then we are dealing with the so-called seasonality, the inclusion of which is very important in the company and enables to better adapt its activity to the customers’ requirements. This article describes the seasonality of demand in a company providing domestic and road transport services with high-tonnage vehicles. The validity of such analyses and potential benefits were indicated.

scholarly journals THE IMPORTANCE OF SOCIAL NETWORKS AS A TOOL FOR EMPLOYER BRANDING FROM THE VIEWPOINT OF SLOVAK CONSUMERS

2020 ◽  
Vol 3 ◽  
pp. 15-19
Author(s):  
Margareta Nadanyiova ◽  
Veronika Paurova
Keyword(s):  
Social Networks ◽  
Labour Market ◽  
Questionnaire Survey ◽  
Theoretical Basis ◽  
Secondary Data ◽  
Employer Branding ◽  
Mathematical Methods ◽  
Scientific Methods ◽  
The Social ◽  
General Scientific

Social networks are a phenomenon that has become a regular part of life for the majority of consumers and they spend much of free time there. With the increasing popularity of social networks, the possibilities of their use are also expanding. Recently, the trend of social networks has also penetrated into the personnel marketing. Due to the current situation on the labour market, in addition to traditional techniques, companies have begun to use the tools of the social networks to recruit employees and build their employer brands. The aim of this article is to define the theoretical basis of social networks and their usage in employer branding from the viewpoint of domestic (Slovak) and foreign authors. This includes an analysis of the practical usage of social networks in employer branding. The secondary data for the analysis were obtained from annual companies reports, statistical tables and published professional publications. In order to determine the perception of social networks as a tool for employer branding, a questionnaire survey was conducted among Slovak people. General scientific methods were applied for the processing of the data, as well as mathematical methods to evaluate the data, collated from the results of the questionnaire survey. Based on this, benefits of social networks and their usage in employer branding are highlighted.

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