Static Security Risk Assessment Based on Outage of Line

2013 ◽  
Vol 339 ◽  
pp. 523-528
Author(s):  
Yi Jie Zhao ◽  
Di Chen Liu ◽  
Jun Wu ◽  
Fei Fei Dong ◽  
Xu Dong Pan ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Transmission Lines ◽  
Assessment Model ◽  
Risk Indicators ◽  
Theoretical Point ◽  
Risk Assessment Model ◽  
Security Risk ◽  
Transmission Grid ◽  
Static Security ◽  
Voltage Limit

From the risk theoretical point of view, static security risk indicators of the transmission grid are built on the basis of the probability theory, grid static security risk indicators, including overload risk indicators and voltage-limit risk indicators. For both risk indicators, the probability of the outage of one line is considered, as well as in the case of the uncertainty of the power system the serious consequences caused by the outage of one line. And the overload risk assessment model and voltage-limit risk assessment model are built. Finally, quantitative assessment and calculation are done through the standard system examples of these two static safety risk indicators, then assess and sort the transmission lines of the importance based on the simulation results.

Dynamic safety prewarning mechanism of human–machine–environment using computer vision

2020 ◽  
Vol 27 (8) ◽  
pp. 1813-1833 ◽  
Author(s):  
Wenpei Xu ◽  
Ting-Kwei Wang
Keyword(s):  
Risk Assessment ◽  
Computer Vision ◽  
Expert Knowledge ◽  
Safety Information ◽  
Assessment Model ◽  
Risk Indicators ◽  
Risk Assessment Model ◽  
Content Type ◽  
Risk Levels

PurposeThis study provides a safety prewarning mechanism, which includes a comprehensive risk assessment model and a safety prewarning system. The comprehensive risk assessment model is capable of assessing nine safety indicators, which can be categorised into workers’ behaviour, environment and machine-related safety indicators, and the model is embedded in the safety prewarning system. The safety prewarning system can automatically extract safety information from surveillance cameras based on computer vision, assess risks based on the embedded comprehensive risk assessment model, categorise risks into five levels and provide timely suggestions.Design/methodology/approachFirstly, the comprehensive risk assessment model is constructed by adopting grey multihierarchical analysis method. The method combines the Analytic Hierarchy Process (AHP) and the grey clustering evaluation in the grey theory. Expert knowledge, obtained through the questionnaire approach, contributes to set weights of risk indicators and evaluate risks. Secondly, a safety prewarning system is developed, including data acquisition layer, data processing layer and prewarning layer. Computer vision is applied in the system to automatically extract real-time safety information from the surveillance cameras. The safety information is then processed through the comprehensive risk assessment model and categorized into five risk levels. A case study is presented to verify the proposed mechanism.FindingsThrough a case study, the result shows that the proposed mechanism is capable of analyzing integrated human-machine-environment risk, timely categorising risks into five risk levels and providing potential suggestions.Originality/valueThe comprehensive risk assessment model is capable of assessing nine risk indicators, identifying three types of entities, workers, environment and machine on the construction site, presenting the integrated risk based on nine indicators. The proposed mechanism, which adopts expert knowledge through Building Information Modeling (BIM) safety simulation and extracts safety information based on computer vision, can perform a dynamic real-time risk analysis, categorize risks into five risk levels and provide potential suggestions to corresponding risk owners. The proposed mechanism can allow the project manager to take timely actions.

Study on the Security of Government Portal Websites

2013 ◽  
Vol 380-384 ◽  
pp. 2534-2538
Author(s):  
Zhao Zhang ◽  
Fang Yong
Keyword(s):  
Risk Assessment ◽  
Assessment Model ◽  
Risk Assessment Model ◽  
Security Risk ◽  
Threat Analysis ◽  
The Government ◽  
Security Risk Assessment ◽  
Government Portal ◽  
Portal Website ◽  
Administrative Strategies

On the basis of threat analysis, the paper proposes a security risk assessment model for government portal website. Using the model, the paper systematically analyzes the security risk of government portal websites and then explains the reason of them. To enhance the security of government portal websites, both technical and administrative strategies were proposed. Those security strategies help improve the image of the government and it plays an important role in constructing service government.

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