scholarly journals Formation and Optimization of Transport Networks in the Conditions of the Digital Integral Environment for Transportation

2020 ◽  
Vol 22 (2) ◽  
pp. 115-122
Author(s):  
Boris Zhelenkov ◽  
Irina Safonova ◽  
Yakov Goldovsky ◽  
Elizaveta I. Dmitrieva
Keyword(s):  
Network Optimization ◽  
Transportation Networks ◽  
Theoretical Description ◽  
Transport Network ◽  
Automated System ◽  
Mathematical Apparatus ◽  
Transport Networks ◽  
Integrated Environment ◽  
Complex Functions ◽  
Different Types

The article provides a brief description of the digital integrated transportation support environment. The methods of choosing the base route in the formation of transport networks in the conditions of the formation of a digital integrated environment are presented. It is shown that the means of solving the problem of optimization of transport networks is a developed modeling complex, which consists of a set of models with the necessary degree of detail. The paper presents a functional diagram and a brief description of the complex. The complex functions taking into account the replenishment, improvement and updating of models, allow you to combine different types of models and use the necessary of them when solving specific problems of transport network optimization. The modeling complex allows to significantly simplify the optimization of transportation networks. On the basis of the proposed mathematical apparatus, the software of an automated system has been developed, which is designed to function in a digital integrated environment, a brief theoretical description of which is given.

scholarly journals Evaluating Performance of Public Transport Networks by Using Public Transport Criteria Matrix Analytic Hierarchy Process Models—Case Study of Stonnington, Bayswater, and Cockburn Public Transport Network

2021 ◽  
Vol 13 (12) ◽  
pp. 6949
Author(s):  
Gang Lin ◽  
Shaoli Wang ◽  
Conghua Lin ◽  
Linshan Bu ◽  
Honglei Xu
Keyword(s):  
Sustainable Development ◽  
Public Transport ◽  
Public Transportation ◽  
Evaluation Criteria ◽  
Performance Standards ◽  
Transport Network ◽  
Process Models ◽  
Transport Infrastructure ◽  
Transport Networks ◽  
Ahp Model

To mitigate car traffic problems, the United Nations Human Settlements Programme (UN-Habitat) issued a document that provides guidelines for sustainable development and the promotion of public transport. The efficiency of the policies and strategies needs to be evaluated to improve the performance of public transportation networks. To assess the performance of a public transport network, it is first necessary to select evaluation criteria. Based on existing indicators, this research proposes a public transport criteria matrix that includes the basic public transport infrastructure level, public transport service level, economic benefit level, and sustainable development level. A public transport criteria matrix AHP model is established to assess the performance of public transport networks. The established model selects appropriate evaluation criteria based on existing performance standards. It is applied to study the Stonnington, Bayswater, and Cockburn public transport network, representing a series of land use and transport policy backgrounds. The local public transport authorities can apply the established transport criteria matrix AHP model to monitor the performance of a public transport network and provide guidance for its improvement.

The Role of Politics in the Historical Transport Networks of the Iberian Peninsula and the Pyrenees from Roman Times to the Nineteenth Century

2021 ◽  
Vol 45 (2) ◽  
pp. 233-260
Author(s):  
Pau de Soto ◽  
Cèsar Carreras
Keyword(s):  
Iberian Peninsula ◽  
Social Factors ◽  
Transport Network ◽  
Political Organization ◽  
Transport Systems ◽  
The Political ◽  
Political Systems ◽  
Transport Networks ◽  
Political Economic

AbstractTransport routes are basic elements that are inextricably linked to diverse political, economic, and social factors. Transport networks may be the cause or result of complex historical conjunctions that reflect to some extent a structural conception of the political systems that govern each territory. It is for this reason that analyzing the evolution of the transport routes layout in a wide territory allows us to recognize the role of the political organization and its economic influence in territorial design. In this article, the evolution of the transport network in the Iberian Peninsula has been studied in a broad chronological framework to observe how the different political systems of each period understood and modified the transport systems. Subsequently, a second analysis of the evolution of transport networks in the northeast of the Iberian Peninsula is included in this article. This more detailed and geographically restricted study allows us to visualize in a different way the evolution and impact of changes in transport networks. This article focuses on the calculation of the connectivity to analyze the intermodal transport systems. The use of network science analyses to study historical roads has resulted in a great tool to visualize and understand the connectivity of the territories of each studied period and compare the evolution, changes, and continuities of the transport network.

scholarly journals Optimization of Stochastic Lossy Transport Networks and Applications to Power Grids

2021 ◽  
Author(s):  
Alessandro Zocca ◽  
Bert Zwart
Keyword(s):  
Mathematical Model ◽  
Renewable Energy ◽  
Smart Grids ◽  
Transport Network ◽  
Power Grids ◽  
Performance Gain ◽  
Power Losses ◽  
Transport Networks ◽  
Trade Off ◽  
Stochastic Load

Motivated by developments in renewable energy and smart grids, we formulate a stylized mathematical model of a transport network with stochastic load fluctuations. Using an affine control rule, we explore the trade-off between the number of controllable resources in a lossy transport network and the performance gain they yield in terms of expected power losses. Our results are explicit and reveal the interaction between the level of flexibility, the intrinsic load uncertainty, and the network structure.

Multichannel Modality in Displaying Information

2013 ◽  
Vol 4 (1) ◽  
pp. 60-79 ◽  
Author(s):  
Elisa Benetti ◽  
Gianluca Mazzini
Keyword(s):  
Computer Science ◽  
Public Administration ◽  
The Other ◽  
Public Institution ◽  
Automated System ◽  
Government Services ◽  
Physical Location ◽  
The Past ◽  
Different Types ◽  
The One

Computer science and telecommunications are increasingly important in society and this leads also public administrations to take advantage of ICT, in order to communicate with citizens in a more rapid and simpler way than the complex and paper-based bureaucracy of the past. While on the one hand the use of these technologies responds to the duty of any public institution to involve the largest number of addressees, on the other hand, society must also consider the limitations of these technologies. Firstly not everybody is so familiar in their use. Moreover, the digital administration thus becomes virtual, accessible only through technological devices and not present in a physical location, and is therefore essential to ensure full coverage of the territory, which is currently not always possible. The main novelty of this paper is the implementation of an automated system capable of adapting different types of government services to multiple communication media. The joint exploitation of multiple technologies allows to use the strengths of one of them when are found the limits of another, making this multichannel modality the solution to the requirement of ICT in public administration.

Analysis of topological defects of land transport network of Siberia and Russian Far East’ regions

2019 ◽  
pp. 53-62
Author(s):  
S. A. Tarkhov
Keyword(s):  
Russian Far East ◽  
Far East ◽  
Topological Defects ◽  
Transport Network ◽  
Transport Networks ◽  
Spatial Isolation ◽  
The Republic ◽  
Degree Of Isolation ◽  
Regional Land ◽  
Nenets Autonomous

The level of topological complexity of land transport networks (including roads, railways and winter seasonal roads) of 27 regions of Siberia and the Far East is analyzed on the basis of 16 topomorphometric parameters. The main types of topological defects in the structure of regional land transport networks were identified: spatial isolation (rupture), an increased level of branching, the presence of several cyclic cores and isolated cyclic elements, and multi-core topological tiers of cyclic cores. The highest degree of isolation is revealed in the transport networks of Kamchatka Territory, Chukotka Autonomous Okrug, Khabarovsk Territory and Tomsk Oblast. Transport networks of the Republic of Altai, the Kamchatka Territory, the Yamalo-Nenets Autonomous Okrug, the Republics of Tuva and Buryatia, the Jewish Autonomous Okrug and of the Island of Sakhalin, as well as the main cyclic skeleton of the Chukotka Autonomous Okrug’s winter seasonal roads have the highest level of branching. Multi- layeredness is characteristic of the transport network of the Khanty-Mansiysk and Yamalo-Nenets Autonomous Districts, the Kemerovo Oblast, the Khabarovsk Territory and Buryatia. The multifocal nature of the second topological tier of the cyclic skeleton is a distinctive feature of land transport networks in the south of the Krasnoyarsk Territory, the Irkutsk Oblast, the Republic of Yakutia, Kemerovo and Novosibirsk Oblasts. The same feature is characteristic for the third topological tier of the communications’ network in the Altai Territory. According to the level of spatial reliability (vulnerability) of the topological structure, the following types of regional transport networks are distinguished: the most reliable (4 regions), highly reliable (8), medium reliable (5), highly vulnerable with a low level of spatial reliability (5), the most vulnerable with a minimum level of spatial reliability (5 regions).

scholarly journals Observer of changes in the forest of the shortest paths on dynamic graphs of transport networks

Doklady BGUIR ◽  
2020 ◽  
Vol 18 (5) ◽  
pp. 71-79
Author(s):  
N. V. Khajynova ◽  
M. P. Revotjuk ◽  
L. Y. Shilin
Keyword(s):  
Shortest Paths ◽  
Transport Network ◽  
Dynamic Graphs ◽  
Transport Networks ◽  
Basic Algorithm ◽  
Collective Control ◽  
Heterogeneous Models ◽  
Shortest Path Trees ◽  
Individual Trees ◽  
Global Influence

The purpose of the work is the development of basic data structures, speed-efficient and memoryefficient algorithms for tracking changes in predefined decisions about sets of shortest paths on transport networks, notifications about which are received by autonomous coordinated transport agents with centralized or collective control. A characteristic feature of transport operations is the independence and asynchrony of the emergence of perturbations of optimal solutions, as well as the lack of global influence of individual perturbations on the set of all processes on the network. This clearly determines the feasibility of realizing the idea of reoptimizing existing solutions in real time as information is received about disturbances in the structure and parameters of the transport network, various restrictions on the use of existing shortest paths. In contrast to the classical problems of finding shortest paths on static or dynamic graphs, it is proposed to supplement the set of situations controlled by the observer by taking into account the associations of shortest path trees with agents that actually use such paths. This will improve the responsiveness of agent notification processes for timely switching to a new path. The space of search states is a dynamically generated bipartite sparse graph of the transport network, represented by a list of arcs. The basic algorithm for finding the shortest paths uses Dijkstra's scheme, but implements a bootstrapping method to generate the search result. The compactness of the representation of the observed forest of shortest paths is achieved by mapping individual trees of such a forest onto the projection of tree vertices in memory, where the position of each vertex corresponds to the distance from the tree root. The proposed version of the construction of the search procedure is based on the mechanisms existing in database management systems for creating different relational representations of the physical data model. This eliminates the need to solve technological problems of complexing heterogeneous models of dynamic transport networks, memory allocation. As a result, the specification of various rules for the logistics of transport operations is simplified, since such operations in terms of object-oriented models are easily determined by polymorphic classes of transitions between nodes of the transport network.

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