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Modeling Multi-phase Multi-component LNAPL Dynamics and Recover in the Subsurface
( Kaveh Sookhak Lari ),( Greg B Davis ),( John L Rayner ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
Light non-aqueous phase liquids (LNAPLs), such as petroleum fuels, consist of thousands of compounds that partition and pose risks to different phases and domains. Our intention is to elucidate how multiphase and multicomponent modelling helps better understand the short and long term fate, recovery performance and risks of LNAPL contamination in subsurface media. We report some recent applications and our modifications to TMVOC / TMVOC-MP, to track natural behaviours and remediation strategies for LNAPL soil and groundwater contamination problems. We report studies on LNAPL natural dynamics and partitioning, measurements of soil gas contamination, verifications of modelling complex recovery approaches to determine LNAPL recovery endpoints and computational techniques for optimizing LNAPL remediation. It is shown how complex phenomena such as hysteresis with theoretically unlimited cycles and new constitutive relationships were added to the codes. The cases reported show the criticality of linking multiphase and multicomponent features for LNAPLs. This is key to improved and optimized LNAPL recovery plans, estimation of endpoints associated with different remediation techniques, representative risk assessments and modelling natural source zone depletion (NSZD).
Survey on Network Virtualization Using OpenFlow: Taxonomy, Opportunities, and Open Issues
( Ahmed Abdelaziz ),( Tan Fong Ang ),( Mehdi Sookhak ),( Suleman Khan ),( Athanasios Vasilakos ),( Chee Sun Liew ),( Adnan Akhunzada ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.10
The popularity of network virtualization has recently regained considerable momentum because of the emergence of OpenFlow technology. It is essentially decouples a data plane from a control plane and promotes hardware programmability. Subsequently, OpenFlow facilitates the implementation of network virtualization. This study aims to provide an overview of different approaches to create a virtual network using OpenFlow technology. The paper also presents the OpenFlow components to compare conventional network architecture with OpenFlow network architecture, particularly in terms of the virtualization. A thematic OpenFlow network virtualization taxonomy is devised to categorize network virtualization approaches. Several testbeds that support OpenFlow network virtualization are discussed with case studies to show the capabilities of OpenFlow virtualization. Moreover, the advantages of popular OpenFlow controllers that are designed to enhance network virtualization is compared and analyzed. Finally, we present key research challenges that mainly focus on security, scalability, reliability, isolation, and monitoring in the OpenFlow virtual environment. Numerous potential directions to tackle the problems related to OpenFlow network virtualization are likewise discussed