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- Bahri, Leila, et al.
(author)
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Enhanced audit strategies for collaborative and accountable data sharing in social networks
- 2018
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In: ACM Transactions on Internet Technology. - : Association for Computing Machinery (ACM). - 1533-5399 .- 1557-6051. ; 18:4
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Journal article (peer-reviewed)abstract
- Data sharing and access control management is one of the issues still hindering the development of decentralized online social networks (DOSNs), which are now gaining more research attention with the recent developments in P2P computing, such as the secure public ledger-based protocols (Blockchains) for monetary systems. In a previous work, we proposed an initial audit-based model for access control in DOSNs. In this article, we focus on enhancing the audit strategies and the privacy issues emerging from records kept for audit purposes. We propose enhanced audit and collaboration strategies, for which experimental results, on a real online social network graph with simulated sharing behavior, show an improvement in the detection rate of bad behavior of more than 50% compared to the basic model.We also provide an analysis of the related privacy issues and discuss possible privacy-preserving alternatives.
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- Berndtsson, Ronny, et al.
(author)
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Educating the compassionate water engineer - a remedy to avoid future water management failures?
- 2005
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In: Hydrological Sciences Journal. - : Informa UK Limited. - 0262-6667 .- 2150-3435. ; 50:1, s. 7-16
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Journal article (peer-reviewed)abstract
- The number of local and regional-scale water management failures appears steadily to increase despite an apparently higher level of engineering solutions at hand. The objective of this paper is to examine the challenges the existing education system needs to meet in order to produce water engineers capable of responding to the complexity of contemporary and future water problems in relation to societal needs. The next generation of water engineers may stay in their professional functions until 2040 or 2050. It is likely that in this period more critical water management and environmental problems will be experienced than have been encountered so far. The question then arises whether the present water engineers have the proper background education to understand environmental, hydrological, ecological and socio-economic problems to resolve related water management problems. Future water engineers must, to a greater extent, include socio-economic consequences in planned and/or designed water management systems and convey greater transparency regarding risks and societal effects.
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- Bouksila, F., et al.
(author)
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Electromagnetic induction prediction of soil salinity and groundwater properties in a Tunisian Saharan oasis
- 2012
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In: Hydrological Sciences Journal. - : Informa UK Limited. - 0262-6667 .- 2150-3435. ; 57:7, s. 1473-1486
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Journal article (peer-reviewed)abstract
- Electromagnetic induction measurements (EM) were taken in a saline gypsiferous soil of the Saharan-climate Fatnassa oasis (Tunisia) to predict the electrical conductivity of saturated soil extract (ECe) and shallow groundwater properties (depth, Dgw, and electrical conductivity, ECgw) using various models. The soil profile was sampled at 0.2 m depth intervals to 1.2 m for physical and chemical analysis. The best input to predict the log-transformed soil salinity (lnECe) in surface (0-0.2 m) soil was the EMh/EMv ratio. For the 0-0.6 m soil depth interval, the performance of multiple linear regression (MLR) models to predict lnECe was weaker using data collected over various seasons and years (R-a(2) = 0.66 and MSE = 0.083 dS m(-1)) as compared to those collected during the same period (R-a(2) = 0.97, MSE = 0.007 dS m(-1)). For similar seasonal conditions, for the Dgw-EMv relationship, R-2 was 0.88 and the MSE was 0.02 m for Dgw prediction. For a validation subset, the R-2 was 0.85 and the MSE was 0.03 m. Soil salinity was predicted more accurately when groundwater properties were used instead of soil moisture with EM variables as input in the MLR.
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- Goude, Anders, et al.
(author)
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A GUI for urban wind flow CFD analysis of small scale wind applications
- 2015
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In: Cyberworlds, 2015 IEEE. - 9781467394031 ; , s. 193-199
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Conference paper (peer-reviewed)abstract
- In order to have better insight into the physics of the urban wind turbines, a graphical user interface (GUI) that employs OpenFOAM flow solver has been developed for industrial applications by Uppsala University with Spanish engineering company SOLUTE via EU framework as part of the WINDUR framework 7 project. Urban wind resource assessment for small scale wind applications present several challenges and complexities for that are different from large-scale wind power generation. Urban boundary layer relevant in this regime of flows have different horizontal profiles impacted by the buildings, low speed wind regimes, separation and different turbulence characteristics. This software addresses the project setup and scientific visualization of the results for right investment decision needs. Preliminary numerical results will be presented for a test site in Huesca, Spain where a measurement campaign is undertaken to validate the Computational Fluid Dynamics (CFD) results.
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