Methodological Framework for Digital Transition and Performance Assessment of Smart Cities

AbstractLocation-based services are becoming more and more popular in mobile online social networks (mOSNs) for smart cities, but users’ privacy also has aroused widespread concern, such as locations, friend sets and other private information. At present, many protocols have been proposed, but these protocols are inefficient and ignore some security risks. In the paper, we present a new location-sharing protocol, which solves two issues by using symmetric/asymmetric encryption properly. We adopt the following methods to reduce the communication and computation costs: only setting up one location server; connecting social network server and location server directly instead of through cellular towers; avoiding broadcast encryption. We introduce dummy identities to protect users’ identity privacy, and prevent location server from inferring users’ activity tracks by updating dummy identities in time. The details of security and performance analysis with related protocols show that our protocol enjoys two advantages: (1) it’s more efficient than related protocols, which greatly reduces the computation and communication costs; (2) it satisfies all security goals; however, most previous protocols only meet some security goals.

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Application of the endurance time methodology on seismic analysis and performance assessment of hydraulic arched tunnels

Tunnelling and Underground Space Technology ◽

10.1016/j.tust.2021.104022 ◽

2021 ◽

Vol 115 ◽

pp. 104022

Author(s):

Benbo Sun ◽

Mingjiang Deng ◽

Sherong Zhang ◽

Chao Wang ◽

Yang Li ◽

...

Keyword(s):

Performance Assessment ◽

Seismic Analysis ◽

Endurance Time ◽

And Performance

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A Multiple Criteria Decision Making Method to Weight the Sustainability Criteria of System Selection for Surface Mining

Energies ◽

10.3390/en14113066 ◽

2021 ◽

Vol 14 (11) ◽

pp. 3066

Author(s):

Michał Patyk ◽

Przemysław Bodziony ◽

Zbigniew Krysa

Keyword(s):

Decision Making ◽

Performance Assessment ◽

Multiple Criteria Decision Making ◽

Surface Mining ◽

Open Pit ◽

Mining Equipment ◽

Surface Mines ◽

Mining Conditions ◽

And Performance ◽

Selection Of

Selection and assessment of mining equipment used in open pit rock mines relies chiefly on estimates of overall exploitation cost. The rational arrangement of mining equipment and systems comprising loading machines, haul trucks and crushing plants should be preceded by a thorough analysis of technical and economic aspects, such as investment outlays and the costs of further exploitation, which largely determine the costs of mining operations and the deposit value. Additionally, the operational parameters of the mining equipment ought to be considered. In this study, a universal set of evaluation criteria has been developed, and an evaluation method has been applied for the selection of surface mining equipment and the processing system to be operated in specific mining conditions, defined by the user. The objective of this study is to develop and apply the new methodology of multi-criteria selection of open pit rock mining equipment based on multiple criteria decision-making (MCDM) procedures, to enable the optimization of loading, handling and crushing processes. The methodology, underpinned by the principles of MCDM, provides the dedicated ranking procedures, including the ELECTRE III. The applied methodology allows the alternative options (variants) to be ranked accordingly. Ultimately, a more universal methodology is developed, applicable in other surface mines where geological and mining conditions are similar. It may prove particularly useful in selection and performance assessment of mining equipment and process line configurations in mining of low-quality rock deposits. Therefore, we undertook to develop universal criteria and applications for the selection and performance assessment of process machines for surface mines, taking into account environmental aspects as well as deposit quality.

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