scholarly journals THE GRAVITY MODEL FORMALIZATION FOR THE INTERCITY PASSENGER’S CORRESPONDENCES PARAMETER’S ESTIMATION

2017 ◽  
Vol 16 (5) ◽  
pp. 437-443 ◽  
Author(s):  
C. V. Dolya
Keyword(s):  
Gravity Model ◽  
Transportation System ◽  
Gravity Models ◽  
Gravity Modeling ◽  
Passenger Transport ◽  
Passenger Transportation ◽  
The Given ◽  
Selection Of ◽  
Calibration Coefficients

he paper considers a possibility to apply gravity models for calculation of intercity passenger transport corres- pondences which are implemented with the help of public transport. The Ukraine transportation system has been selected as an object of investigation and this approach extends application possibilities of the obtained results. Calibration coefficients used in calculation of the indicated correspondences are rather important and significant in case of forecasting passenger transport correspondences. Formalization of these factors is necessary for every transportation system if a calculation of pas-senger transport correspondences has been made for it. In this case searching for actual calibration parameters and other coef-ficients as components of gravitational models is a relevant objective of the given paper. Selection of the gravity model va- riant plays rather significant role in solution of this problem. The developed methods for calculation of passenger transport correspondences are proposed for their application in respect of various transport and trip types. The executed research works have made it possible to investigate a process pertaining to providing of services for passenger transportation while using public routes. The obtained characteristics on functioning of the studied system have allowed to assess the possibility for ap-plication of the known methods for calculation of passenger correspondences and analyze the quality of their application. Calibration coefficients have been empirically selected for calculation of the indicated correspondences while using method of gravity modeling. Formalization of previously unexplored parameters of gravity model component provides the possibility to apply the considered approach for calculation of passenger correspondences within the framework of the investigated trans-portion system. This makes it possible to plan and arrange interaction of various transport types and provides new data and knowledge on the studied system.

Automation Tool Preparation in the Conditions of Production

2015 ◽  
Vol 770 ◽  
pp. 739-743 ◽  
Author(s):  
A.S. Yuanyushkin ◽  
D.V. Lobanov ◽  
D.A. Rychkov
Keyword(s):  
Comparative Analysis ◽  
Rational Design ◽  
Economic Effect ◽  
Optimal Choice ◽  
Processing Efficiency ◽  
Time Required ◽  
The Given ◽  
High Processing ◽  
Selection Of

The key task of the tool manufacturing is to create or to choose such a type of tool, which would permit to provide high processing efficiency, the best tool`s workability and the quality of the machined surfaces with minimum expenses and resources. The optimal choice of the constructive tool modifications from a variety of options takes much time required for the preparation of the tool to work. To solve this problem, we have developed software that allows you to create, organize and carry out a comparative analysis of structural instruments in order to identify rational option for the given conditions of production. Ordering and selection of a rational design of the instrument is carried out in accordance with established procedures of modeling and comparative analysis of design solutions. Application software can reduce design time technological process by 80...90%, and get a substantial annual economic effect.

scholarly journals Influence of the Choice of Lunar Gravity Model on Orbit Determination for Lunar Orbiters

2018 ◽  
Vol 2018 ◽  
pp. 1-17 ◽  
Author(s):  
Young-Rok Kim ◽  
Young-Joo Song ◽  
Jonghee Bae ◽  
Bang-Yeop Kim
Keyword(s):  
Gravity Model ◽  
Orbit Determination ◽  
Selection Effect ◽  
Gravity Models ◽  
Gravity Modeling ◽  
Lunar Gravity ◽  
Deep Space ◽  
Error Covariance ◽  
Level Measurement ◽  
Acquisition Condition

We examine the influence of the lunar gravity model on the orbit determination (OD) of a lunar orbiter operating in a 100 km high, lunar polar orbit. Doppler and sequential range measurements by three Deep Space Network antennas and one Korea Deep Space Antenna were used. For measurement simulation and OD analysis, STK11 and ODTK6 were utilized. GLGM2, LP100K, LP150Q, GRAIL420A, and GRAIL660B were used for investigation of lunar gravity model selection effect. OD results were assessed by position and velocity uncertainties with error covariance and an external orbit comparison using simulated true orbit. The effect of the lunar gravity models on the long-term OD, degree and order level, measurement-acquisition condition, and lunar altitude was investigated. For efficiency verification, computational times for the five lunar gravity models were compared. Results showed that significant improvements to OD accuracy are observed by applying a GRAIL-based model; however, applying a full order and degree gravity modeling is not always the best strategy, owing to the computational burden. Consequently, we consider that OD using GRAIL660B with 70 × 70 degree and order is the most efficient strategy for mission preanalysis. This study provides useful guideline for KPLO OD analysis during nominal mission operation.

scholarly journals APPLICATION OF STATISTICAL TOOLS FOR ESTIMATION OF CLONAL LINES AT IMPROVEMENT OF VIRUS-FREE POTATO VARIATES

2012 ◽  
Vol 15 ◽  
pp. 125-139
Author(s):  
I.V. Demchuk
Keyword(s):  
Statistical Estimation ◽  
Potato Cultivars ◽  
Initial Material ◽  
Statistical Tools ◽  
Potato Varieties ◽  
Clonal Lines ◽  
The Given ◽  
Productive Virus ◽  
Selection Of

Productivity of use of technique for statistical estimation of virusfree clonal lines at improvement of potato varieties was overviewed. It was shown, that application of the given technique can considerably improve the quality of initial material at sanitation of potato cultivars by biotechnological methods at the expense of selection of highly productive virus-free lines without deviations from the initial phenotype.

scholarly journals ASSESSMENT OF THE INFLUENCE OF THE CITY'S ROUTES’ INDICATORS ON THE DECREASE IN PASSENGER INCOME AS A RESULT OF TRANSPORT FATIGUE

2021 ◽  
Vol 3 (163) ◽  
pp. 179-186
Author(s):  
K. Vakulenko ◽  
N. Sokolova ◽  
E. Lezhneva ◽  
J. Vetushka ◽  
N. Shyllye
Keyword(s):  
Functional State ◽  
Traffic Safety ◽  
Road Traffic ◽  
Passenger Transport ◽  
Transport Service ◽  
Vehicle Interior ◽  
Expert Opinions ◽  
Passenger Transportation ◽  
The Individual

One of the requirements of our time is a high-quality public transport service for passengers. Reliability and regularity of traffic, duration and comfort of the trip, traffic safety, availability of equipped and convenient stops - all this and many other factors affect the quality of passenger service. The peculiarities of the organization of passenger transportation, as well as the performance of city routes, affect the psychophysiological state of a person and, as a result, the functional state and the degree of passenger fatigue, which leads to a decrease in his income. The study identified and analyzed the performance indicators of competing routes, which duplicate each other: bus route №276e and trolleybus route № 46. Based on the analysis of studies in the field of the quality of the provision of services by passenger transport, a survey form was formed on the quality of transportation on the routes of urban passenger transport. The assessment of the degree of consistency of experts' opinions using the Kendall coefficient of concordance indicates the consistency of expert opinions. Most of the criteria that were determined by passengers (interval of movement, the degree of filling and the service life of the vehicles) are indicators of the operation of the route, affect the passenger's transport fatigue and a decrease in the passenger's income. The change in the level of transport fatigue of the passenger during the waiting periods and at the end of the route trip in general along the directions of movement and on the individual hauls of the routs are determined. When assessing the quality of transport service on routes, the obtained values of transport fatigue indicate that when using routes, the condition of passengers is assessed as "good". But, if we consider the state of the passenger while using the individual hauls of the routes, his transport fatigue changes significantly and is assessed as "satisfactory". The value of a decrease in passenger income on routes increases throughout the trip, due to the dense filling of the vehicle interior, which negatively affects the functional state of the passenger. Under the existing conditions of passenger transportation on routes, the value of passenger fatigue and the value of passenger income reduction on bus route No. 276e exceeds the value of this indicator on the trolleybus route. To improve the organization of the bus route No. 276е, it is proposed to update vehicles and use buses with a larger passenger capacity (III class instead of I and II, which are used on the bus route now). After the implemented proposed measures for the busiest direction: the occupancy rate of the bus cabin decreased from 1,05 to 0,36, transport fatigue decreased from 5,5 points to 3,03 points, respectively, the value of the decrease in income from 60,55 UAH to 51,53 UAH. Updating vehicles on the Kharkiv bus routes are an urgent problem that requires an immediate solution to improve the quality of passenger transportation. The use of obsolete vehicles on city bus routes affects not only the passenger's fatigue, but also the drivers and, as a result, the likelihood of an road traffic accident. A significant adverse factor affecting the driver is the air pollution of the vehicle interior with harmful compounds, especially carbon monoxide.

Procedure for Admittance of the Contractor Companies to Perform the Work at the Construction Site

2021 ◽  
pp. 24-28
Author(s):  
E.V. Glebova ◽  
◽  
E.A. Fomin ◽  
M.V. Ivanova ◽  
◽  
...  
Keyword(s):  
Injury Rate ◽  
Construction Site ◽  
Matrix Elements ◽  
Current Period ◽  
The Matrix ◽  
Industrial Injuries ◽  
High Level ◽  
The Given ◽  
Selection Of

The article is devoted to the assessment of the contractor companies activity in the field of safety both before the start of work execution and during the execution of work at the construction site of the Client’s company. Analysis is given concerning the industrial injuries from 2009 to 2018 in Russia, based on which the tendency to reduce industrial injuries for the current period is determined, and the coefficients of the frequency of injuries in various countries for 2015 are calculated. Based on the performed analysis, the injury rate in Russia is still at a high level. Economic component for the materials, personnel qualifications, and savings on safety from the Client’s company can also lead to injuries at the construction site. The main reasons for low quality of the work performed at the construction site, which in turn lead to injuries, are given in the article. Matrix for the assessment of the contractor companies was developed, with the help of which it is proposed to assess all the aspects of their activities that effect on safety of the work performed. Among the assessed aspects there are sections related to training, behavior and motivation of the personnel, audits conducted by the contractor companies in relation to the subcontractors, investigation of incidents by using the current procedures and contractor personnel responsibilities. One of the matrix elements is presented for assessment. Each element from the given section is proposed to be assessed on a scale from 0 to 3, where each aspect is presented in the form of an action, an assessment of this action and its result. Recommendations on the use of this methodology in the selection of contractors are provided.

scholarly journals Position of railway passenger transport companies on current liberalized transport market

2018 ◽  
Vol 235 ◽  
pp. 00020 ◽  
Author(s):  
Zdenka Záhumenská ◽  
Martin Vojtek ◽  
Jozef Gašparík
Keyword(s):  
Market Share ◽  
Transport System ◽  
Point Of View ◽  
Market Liberalization ◽  
Passenger Transport ◽  
Passenger Transportation ◽  
Current Trends ◽  
Railway Passenger Transport ◽  
Railway Passenger

Market liberalization is a great contemporary trend in many fields of economy. Liberalized transport market, where the transport demand is meeting with transport offer, is evolving dynamically. Private railway passenger operators want to increase their market share together with national railway passenger transport companies therefore the quality of passenger transportation is getting higher, which positively influences the attractiveness of railway passenger transport. The article is focused on these current trends of liberalization in railway passenger transport market. From operational and economical point of view, there are described some ways, how to make the railway passenger transport system more effective and make the entire transport system more attractive for traveling public.

Comparative analysis of the structure of passenger transportation in Russia

2021 ◽  
Vol 2 (4) ◽  
pp. 403-410
Author(s):  
A. V. Sugorovsky ◽  
E. V. Voronina ◽  
E. R. Karpova ◽  
A. A. Podverbnykh
Keyword(s):  
Public Transport ◽  
High Speed ◽  
State Intervention ◽  
Rail Transport ◽  
Air Transport ◽  
Passenger Transport ◽  
Sharp Decline ◽  
Passenger Transportation ◽  
Inland Water Transport

Passenger transport of the country has a significant impact on the level of its economic development, providing the connection of the population with objects of industrial, social, cultural and household purposes.In Russia, intercity passenger transportation by public transport is mainly represented by bus, rail, aviation (aircraft) and water (domestic). The article analyzes the dynamics of passenger transportation and passenger turnover of public transport for the period from 2015 to 2020, presents a calculation of the number of flights performed by bus, rail, air (aircraft) and water (domestic) transport, identifies the reasons for the lack of development of passenger transportation and suggests solutions.It is established that inland water transport is currently undergoing decline and state intervention is necessary for their development. Also, during the period under review, there is a decrease in the popularity of buses and a preference for private transport to public, it is necessary to improve the quality of transportation. The indicators of air and rail transport have positive dynamics, but they also require growth. The development of air transport in Russia can be carried out by the introduction of new services, for example, air taxi, rail-transport in the field of urban and suburban communications, the construction of new high - speed highways. In 2020, due to the announcement of restrictions on movement and quarantine measures, there is a sharp decline in indicators for all types of transport.The materials can be used to analyze and improve the work of the country's passenger complex.

TRANSPORT MOBILITY INDEX OF LARGE RUSSIAN CITIES

2021 ◽  
Vol 73 (2) ◽  
pp. 40-48
Author(s):  
R.R. ZAGIDULLIN ◽  
◽  
D.A. DRYUCHIN ◽  
Keyword(s):  
Public Transport ◽  
Passenger Transport ◽  
Mobility Index ◽  
Passenger Transportation ◽  
Transport Services ◽  
Transport Mobility

The relevance of the problem is due to the lack of a method and indicators for assessing the level of transport mobility of cities. The purpose of the article is to develop a method for assessing the level of transport mobility. Currently, there are no science - based criteria for assessing the level of mobility in terms of the convenience of passengers using various types of public transport for travel. The use of the transport mobility index will contribute not only to improving the quality of passenger transport, but also to improving the level of transport services in General. The developed method for assessing the level of transport mobility will allow you to study the dynamics of changes in indicators and plan measures to improve the quality of transport services. The implementation of the proposed method will allow analyzing routes, as well as planning measures to increase the level of transport mobility and the attractiveness of public transport for passenger transportation.

scholarly journals ОЦІНКА ВПЛИВУ ПАРАМЕТРІВ ЯКОСТІ ТРАНСПОРТНОЇ ПОСЛУГИ МІСЬКОГО ПАСАЖИРСЬКОГО ПІДПРИЄМСТВА- ПЕРЕВІЗНИКА НА ТРАНСПОРТНУ ПОВЕДІНКУ В МІСТІ КИЄВІ

2019 ◽  
pp. 31-37
Author(s):  
Петровська Світлана Іванівна
Keyword(s):  
Behavioral Responses ◽  
Urban Transport ◽  
Passenger Transport ◽  
Passenger Traffic ◽  
Passenger Transportation ◽  
Transport Services ◽  
Transportation Service ◽  
Private Car ◽  
Traditional Approaches

The rapid significant increase in the quality of the process of passenger transportation by Kyiv public transport can be a powerful motivation to increase the frequency of its use. However, the parameters of the desired change in the quality of urban transport remain unknown, which leads to its chaotic management. Two trends in urban passenger traffic quality research are common. The first approach deals with measuring the operating parameters of the transport system, and the second one focuses on the research of customers' opinions regarding transport services. However, none of the scientists focuses fully on the specific human behavioral responses to the quality of the city's passenger transportation service, when urban transport is opposed to a private car. Because of this, the assessment of the quality of urban passenger transport requires the development of special tools. It is already clear today that not all traditional approaches used in studies of transport behavior that depend on the quality structure may be suitable for this.

scholarly journals CHOOSING A QUALITY CRITERION FOR EVALUATING THE FORECAST OF NONLINEAR NON-STATIONARY PROCESSES

2021 ◽  
Author(s):  
Andrii O. Belas ◽  
Petro I. Bidyuk
Keyword(s):  
Quality Criterion ◽  
Absolute Error ◽  
Economic Systems ◽  
Nonstationary Processes ◽  
Regression Problem ◽  
Advantages And Disadvantages ◽  
The Given ◽  
Relative Metric ◽  
Selection Of

Background. The problem of forecasting nonlinear nonstationary processes presented in the form of time series is very relevant, since such series can describe dynamics of the processes in both technical and economic systems. To establish the best model, various metrics are used to assess the quality of forecasts, such as R^2, RMSE, MAE, MAPE. However, in many tasks, when optimizing the model according to the selected criterion, the model becomes worse in relation to another criterion. Therefore it is important to understand which metric must be used to optimize and assess the quality of the forecast in the given task. Objective. The aim of the paper is to develop a criteria base for assessing forecasts of nonlinear nonstationary processes, as well as an approach to choosing a metric in accordance to the specificity of the set forecasting problem. Methods. The paper presents a comparative analysis of the basic metrics for the regression problem, their theoretical and practical meaning, advantages and disadvantages in various cases. New approaches are proposed based on the results of the analysis. Results. Based on the analysis of the selected data, it is shown that by optimizing the model according to the selected criterion, the model becomes worse in relation to another criterion. A criterion basis for assessing forecasts of nonlinear nonstationary processes has been formed, as well as an approach to the selection of a quality criterion in accordance with the specifics of the set forecasting problem. To minimize an absolute error, the RMSE (MSE, R^2) and MAE metrics are analysed and recommended, depending on the need to work with outliers. The RMSLE metric is proposed for solving the problems of minimizing the relative metric, for solving the shown problems of the MAPE metric for this class of problems.  Conclusions. The paper shows the importance of choosing a metric that must be used to optimize and assess the quality of the forecasts in the given task. The obtained criterion base and approach can be used in further research to solve practical prob- lems in modelling and forecasting nonlinear nonstationary processes and to develop new methods or general method for solving such problems.

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