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An SLA-oriented Multiparty Trust Negotiation Model based on HCPN in Cloud Environment
Chunzhi Wang,Qiuxia Chen,Hongwei Chen,Hui Xu 보안공학연구지원센터 2015 International Journal of u- and e- Service, Scienc Vol.8 No.7
The negotiation on Service Level Agreement (SLA) in current complex cloud environment often involves the multilateral negotiation. Therefore, this paper presents an SLA-oriented multiparty trust negotiation model based on Hierarchical Colored Petri Net (HCPN) in cloud environment. This model mainly provides trust negotiation of SLA parameters such as credibility, reliability, availability and service price so on for Cloud Service Providers (CSPs) and Cloud Service Consumers (CSCs), thus making complex process description of multiparty trust negotiation on SLA in cloud environment simple and efficient. On the basis of the HCPN model on SLA, this paper puts forward a multi-objective optimization algorithm for SLA trust negotiation. Simulation results show that the algorithm not only improves efficiency of multilateral negotiation, but also avoids QoS negotiation falling into local optimization.
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Jianbin Zhang,Xiong-hui Wei,Qiuxia Xu,Jianbai Xiao 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.12
SO2 absorption capabilities of DEGDME+H2O system with different compositions were systemically investigated. The DEGDME+H2O system exhibited superior SO2 absorption capability and optimal desorption property with a desorption rate of higher than 94% under the desorption conditions. In addition, it has been demonstrated that the DEGDME+H2O system possessed remarkable SO2 absorbing and releasing capability after multiple recycles. Moreover, GLE data were measured for dilute SO2 in the system of DEGDME+H2O, in which SO2 partial pressures were determined in the range of 0 to 140 Pa. By fitting of GLE data, HLC, ΔH, ΔS and ΔG of SO2 absorption process were obtained. UV, FTIR, 1H-NMR, and 13C-NMR spectra of absorbing systems in the SO2 absorption processes were studied to elucidate the absorption mechanism. On the basis of the spectral results, the intermolecular hydrogen bonding and S…O interaction between SO2 with the absorption system were discussed.
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