A High-Speed Railway Data Placement Strategy Based on Cloud Computing

2011 ◽  
Vol 135-136 ◽  
pp. 43-49
Author(s):  
Han Ning Wang ◽  
Wei Xiang Xu ◽  
Chao Long Jia
Keyword(s):  
Cloud Computing ◽  
High Speed ◽  
Data Access ◽  
Interval Mapping ◽  
Data Placement ◽  
Programming Algorithm ◽  
High Speed Railway ◽  
Mapping Algorithm ◽  
Data Intensive ◽  
Study Results

The application of high-speed railway data, which is an important component of China's transportation science data sharing, has embodied the typical characteristics of data-intensive computing. A reasonable and effective data placement strategy is needed to deploy and execute data-intensive applications in the cloud computing environment. Study results of current data placement approaches have been analyzed and compared in this paper. Combining the semi-definite programming algorithm with the dynamic interval mapping algorithm, a hierarchical structure data placement strategy is proposed. The semi-definite programming algorithm is suitable for the placement of files with various replications, ensuring that different replications of a file are placed on different storage devices. And the dynamic interval mapping algorithm could guarantee better self-adaptability of the data storage system. It has been proved both by theoretical analysis and experiment demonstration that a hierarchical data placement strategy could guarantee the self-adaptability, data reliability and high-speed data access for large-scale networks.

scholarly journals A Cloud-Computing-Based Data Placement Strategy in High-Speed Railway

2012 ◽  
Vol 2012 ◽  
pp. 1-15 ◽  
Author(s):  
Hanning Wang ◽  
Weixiang Xu ◽  
Futian Wang ◽  
Chaolong Jia
Keyword(s):  
Cloud Computing ◽  
Data Sharing ◽  
High Speed ◽  
Large Scale ◽  
Interval Mapping ◽  
Data Placement ◽  
Programming Algorithm ◽  
High Speed Railway ◽  
Typical Application ◽  
Mapping Algorithm

As an important component of China’s transportation data sharing system, high-speed railway data sharing is a typical application of data-intensive computing. Currently, most high-speed railway data is shared in cloud computing environment. Thus, there is an urgent need for an effective cloud-computing-based data placement strategy in high-speed railway. In this paper, a new data placement strategy named hierarchical structure data placement strategy is proposed. The proposed method combines the semidefinite programming algorithm with the dynamic interval mapping algorithm. The semi-definite programming algorithm is suitable for the placement of files with various replications, ensuring that different replications of a file are placed on different storage devices, while the dynamic interval mapping algorithm ensures better self-adaptability of the data storage system. A hierarchical data placement strategy is proposed for large-scale networks. In this paper, a new theoretical analysis is provided, which is put in comparison with several other previous data placement approaches, showing the efficacy of the new analysis in several experiments.

On prospects for the development of high-speed railway lines in Russia

2017 ◽  
pp. 7-14
Author(s):  
Nikolay Bushuyev ◽  
Darina Shulman
Keyword(s):  
Russian Federation ◽  
High Speed ◽  
Network Formation ◽  
Practical Importance ◽  
High Speed Railway ◽  
Complex Approach ◽  
Study Results ◽  
High Speed Trains ◽  
The Russian Federation ◽  
Traffic Organization

Objective: To consider the prospects for the development of high-speed railway lines (VSM) in Russia. To analyze the fundamentals of “Updated program of high-speed railway communication on the territory of the Russian Federation” approved on November, 23rd 2015 by the decision of OAO “RZhD” board meeting and the social board on the issues of high-speed railway communication in Russia. To formulate the specificities of high-speed traffic organization: promising directions of high-speed headings realization before 2030, as well as the stages of their implementation in Russia. Methods: Multiple regression analysis, as well as the method of multi criterial decisions optimization was applied in the study. Results: The analysis of current and perspective headings was carried out, as well as such characteristics as speed and the running time of “Sapsan” high-speed trains and “Allegro”, “Strizh”, “Lastochka” rapid trains. Special attention was paid to the comparison of strategies given in “Updated program of high-speed railway communication on the territory of the Russian Federation” with the main scientific findings stated in VSM network formation part, obtained on the basis of complex approach to the solution of justification of VSM network formation stage-by-stage approach, taking into account multi criterial estimation of cities and regions’ potential and application of mathematical traffic flow model approach as part of basic regional socioeconomic indices of cities and regions, situated in the zones attractive for future VSM construction. Practical importance: The conclusion was made on the necessity to continue exploratory development in the sphere of topology specification research and stage-by-stage formation of the first VSM in Russia.

Ballast Flying DEM Microscopic Analysis and Counteracting Measures

2011 ◽  
Vol 97-98 ◽  
pp. 266-270 ◽  
Author(s):  
Guo Qing Jing ◽  
Liang Gao ◽  
Xiao Lin Sun
Keyword(s):  
Friction Coefficient ◽  
Microscopic Study ◽  
High Speed ◽  
Microscopic Analysis ◽  
Dynamic Force ◽  
High Speed Railway ◽  
Model Method ◽  
Study Results

Ballast flying problems obsess the high speed railway developments, causing damages to the train and deteriorations to the rail. In the paper, DEM is used to conduct ballast flying mechanism microscopic study, results show ballast flying increases with train dynamic force, and decreases with ballast size and friction coefficient, ballast flying counteracting measures are presented, such as ballast bed parameter and ballast glue. In the end, future possible microscopic ballast flying model method is presented by DEM coupled with CFD.

scholarly journals Cloud bursting galaxy: federated identity and access management

2019 ◽  
Vol 36 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Vahid Jalili ◽  
Enis Afgan ◽  
James Taylor ◽  
Jeremy Goecks
Keyword(s):  
Cloud Computing ◽  
High Speed ◽  
Large Scale ◽  
Best Practice ◽  
Data Transfer ◽  
Data Access ◽  
Web Security ◽  
Biomedical Data ◽  
Authentication And Authorization ◽  
Computing Platforms

Abstract Motivation Large biomedical datasets, such as those from genomics and imaging, are increasingly being stored on commercial and institutional cloud computing platforms. This is because cloud-scale computing resources, from robust backup to high-speed data transfer to scalable compute and storage, are needed to make these large datasets usable. However, one challenge for large-scale biomedical data on the cloud is providing secure access, especially when datasets are distributed across platforms. While there are open Web protocols for secure authentication and authorization, these protocols are not in wide use in bioinformatics and are difficult to use for even technologically sophisticated users. Results We have developed a generic and extensible approach for securely accessing biomedical datasets distributed across cloud computing platforms. Our approach combines OpenID Connect and OAuth2, best-practice Web protocols for authentication and authorization, together with Galaxy (https://galaxyproject.org), a web-based computational workbench used by thousands of scientists across the world. With our enhanced version of Galaxy, users can access and analyze data distributed across multiple cloud computing providers without any special knowledge of access/authorization protocols. Our approach does not require users to share permanent credentials (e.g. username, password, API key), instead relying on automatically generated temporary tokens that refresh as needed. Our approach is generalizable to most identity providers and cloud computing platforms. To the best of our knowledge, Galaxy is the only computational workbench where users can access biomedical datasets across multiple cloud computing platforms using best-practice Web security approaches and thereby minimize risks of unauthorized data access and credential use. Availability and implementation Freely available for academic and commercial use under the open-source Academic Free License (https://opensource.org/licenses/AFL-3.0) from the following Github repositories: https://github.com/galaxyproject/galaxy and https://github.com/galaxyproject/cloudauthz.

Performance-Based Design Research on a Long-Span High-Speed Railway Suspension Bridge

2019 ◽  
Author(s):  
Xiaoguang Liu ◽  
Hui Guo ◽  
Xinxin Zhao ◽  
Pengfei Su ◽  
Mangmang Gao
Keyword(s):  
High Speed ◽  
Rotation Angle ◽  
Suspension Bridge ◽  
Performance Based Design ◽  
Live Load ◽  
Stay Cable ◽  
Expansion Joint ◽  
High Speed Railway ◽  
Track Geometry ◽  
Study Results

<p>A performance-based design (PBD) framework for high-speed railway suspension bridge is proposed from aspects of structural, operational and public requirements. Stiffness indexes are discussed. Results show that target performance shall include stiffness, strength, fatigue, stability, track geometry, train operation performance, human safety and public loss, etc. Case study results of a high-speed railway suspension bridge show that large cable force provide gravity stiffness with the vertical deflection to main span length is 1/488 under static live load. The longitudinal displacement (LD) is restricted to a proper value by arrangement of inclined stay cable at the mid-span and the viscous dampers between pylon and stiffening girder. LD at girder end under the total live load is 261mm. And the longitudinal drift mode shape appears later than symmetrical transverse and vertical bending. The vertical rotation angle at girder end is only 0.77‰ under ZK load (0.8UIC) for passenger-dedicated line by setting auxiliary pier at side span of the bridge. Considering the operational performance, elastic deformation of wind-resistant bearings at girder end shall be restricted to decrease the transverse rotation angle which has the limit value from 1.0‰ to 2.5‰ under different train speed. And the integral design of bridge expansion joint (BEJ) and rail expansion joint (REJ) at girder end is required.</p>

Telecommunication systems and high-speed railway transport networks

2017 ◽  
pp. 28-46
Author(s):  
Andrey Kanayev ◽  
Andrey Pryvalov ◽  
Vladimir Kotov ◽  
Arkadiy Lebedinskiy ◽  
Pavel Plekhanov ◽  
...  
Keyword(s):  
Control System ◽  
Information Security ◽  
Cyber Security ◽  
High Speed ◽  
Telecommunication Networks ◽  
Theory Approach ◽  
Railway Transport ◽  
High Speed Railway ◽  
Study Results ◽  
The Given

Objective: To consider the main approaches to organization of systems and communication networks on high-speed railway transport and provide cyber security on the basis of current international and home practice in the given sphere. Methods: Game-theory approach, hierarchy analysis method as well as topological transformation of stochastic networks were applied in the given study. Results: It was detected that a single realization of organizational and technical measures on cyber security cannot provide strong security from threats of cyber security during a long period of time; the latter is connected with constant development of data infrastructure, modification of methods, as well as the methods of attacks, potential attacker opportunities and other factors. Telecommunication networks’ security (TKS) of OJSC “Russian railways” and high-speed railway lines (VSM) from cyber impact is a systemic problem, for the solution of which fundamental research studies are to be conducted, aimed at the detection of basic patterns of information confrontation and directions of TKS cyber security provision and, subsequently, research and development activities for creating an automated communication control system of OJSC “Russian railways” and VSM, the constituent part of which is a subsystem of TKS information security. It is advisable to create an expert council based at regional transport universities, which provide extensive analysis conduct of systems and means of providing information security offered by the industry, as well as cyber security of OJSC “Russian railways” and VSM critically important systems including TKS. Practical importance: The realization of the suggested approach to OJSC “Russian railways” and VSM cyber security provision will make it possible to form the conditions for safe functioning of elements of information infrastructure, provide the creation, effective functioning and the improvement of cyber security control system, as well as to minimize damage from possible attack attempts.

scholarly journals Stork data scheduler: mitigating the data bottleneck in e-Science

2011 ◽  
Vol 369 (1949) ◽  
pp. 3254-3267 ◽  
Author(s):  
Tevfik Kosar ◽  
Mehmet Balman ◽  
Esma Yildirim ◽  
Sivakumar Kulasekaran ◽  
Brandon Ross
Keyword(s):  
Side Effect ◽  
Data Transfer ◽  
Scientific Discovery ◽  
Data Access ◽  
Data Placement ◽  
Transfer Performance ◽  
Data Intensive ◽  
End To End ◽  
Computational Resources

In this paper, we present the Stork data scheduler as a solution for mitigating the data bottleneck in e-Science and data-intensive scientific discovery. Stork focuses on planning, scheduling, monitoring and management of data placement tasks and application-level end-to-end optimization of networked inputs/outputs for petascale distributed e-Science applications. Unlike existing approaches, Stork treats data resources and the tasks related to data access and movement as first-class entities just like computational resources and compute tasks, and not simply the side-effect of computation. Stork provides unique features such as aggregation of data transfer jobs considering their source and destination addresses, and an application-level throughput estimation and optimization service. We describe how these two features are implemented in Stork and their effects on end-to-end data transfer performance.

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