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  • Hindawi Limited  (4)
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  • Hindawi Limited  (4)
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  • 1
    Online Resource
    Online Resource
    Cross-Platform Strong Privacy Protection Mechanism for Review Publication
    Hindawi Limited ; 2021
    In:  Security and Communication Networks Vol. 2021 ( 2021-6-8), p. 1-22
    Details
    In: Security and Communication Networks, Hindawi Limited, Vol. 2021 ( 2021-6-8), p. 1-22
    Abstract: As a review system, the Crowd-Sourced Local Businesses Service System (CSLBSS) allows users to publicly publish reviews for businesses that include display name, avatar, and review content. While these reviews can maintain the business reputation and provide valuable references for others, the adversary also can legitimately obtain the user’s display name and a large number of historical reviews. For this problem, we show that the adversary can launch connecting user identities attack (CUIA) and statistical inference attack (SIA) to obtain user privacy by exploiting the acquired display names and historical reviews. However, the existing methods based on anonymity and suppressing reviews cannot resist these two attacks. Also, suppressing reviews may result in some reiews with the higher usefulness not being published. To solve these problems, we propose a cross-platform strong privacy protection mechanism (CSPPM) based on the partial publication and the complete anonymity mechanism. In CSPPM, based on the consistency between the user score and the business score, we propose a partial publication mechanism to publish reviews with the higher usefulness of review and filter false or untrue reviews. It ensures that our mechanism does not suppress reviews with the higher usefulness of reviews and improves system utility. We also propose a complete anonymity mechanism to anonymize the display name and avatars of reviews that are publicly published. It ensures that the adversary cannot obtain user privacy through CUIA and SIA. Finally, we evaluate CSPPM from both theoretical and experimental aspects. The results show that it can resist CUIA and SIA and improve system utility.
    Type of Medium: Online Resource
    ISSN: 1939-0122 , 1939-0114
    URL: Article
    DOI: 10.1155/2021/5556155
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2021
    detail.hit.zdb_id: 2415104-X
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Privacy-Preserving Query Scheme (PPQS) for Location-Based Services in Outsourced Cloud
    Hindawi Limited ; 2022
    In:  Security and Communication Networks Vol. 2022 ( 2022-1-21), p. 1-16
    Details
    In: Security and Communication Networks, Hindawi Limited, Vol. 2022 ( 2022-1-21), p. 1-16
    Abstract: Pervasive smartphones boost the prosperity of location-based service (LBS) and the increasing data prompt LBS providers to outsource their LBS datasets to the cloud side. The privacy issues of LBS in the outsourced cloud scenario have attracted considerable interest recently. However, current schemes cannot provide sufficient privacy preservation against practical challenges and are little concerned about the data retrieval efficiency of the cloud side. Therefore, we present an efficient Privacy-Preserving LBS Query Scheme (i.e., PPQS ). In our scheme, two cloud entities are employed to store the sensitive information of the outsourced data and provide the query service, which enhances the ability of privacy preservation for sensitive information. Besides, by using the techniques of homomorphic encryption and searchable symmetric encryption, the proposed scheme supports both the type query and the range query, which can significantly improve the data retrieval efficiency of the cloud side and reduce the computation burden on the cloud side and the user side. Through detailed analysis on security and computation cost, we show the enhanced ability of privacy preservation and the lower computation cost compared to previous schemes. Based on a real dataset, extensive simulations are performed to validate the effectiveness and performance of our scheme.
    Type of Medium: Online Resource
    ISSN: 1939-0122 , 1939-0114
    URL: Article
    DOI: 10.1155/2022/9360899
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2022
    detail.hit.zdb_id: 2415104-X
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    Online Resource
  • 3
    Online Resource
    Online Resource
    Characteristics of UV-MicroO 3 Reactor and Its Application to Microcystins Degradation during Surface Water Treatment
    Hindawi Limited ; 2015
    In:  Journal of Chemistry Vol. 2015 ( 2015), p. 1-9
    Details
    In: Journal of Chemistry, Hindawi Limited, Vol. 2015 ( 2015), p. 1-9
    Abstract: The UV-ozone (UV-O 3 ) process is not widely applied in wastewater and potable water treatment partly for the relatively high cost since complicated UV radiation and ozone generating systems are utilized. The UV-microozone (UV-microO 3 ), a new advanced process that can solve the abovementioned problems, was introduced in this study. The effects of air flux, air pressure, and air humidity on generation and concentration of O 3 in UV-microO 3 reactor were investigated. The utilization of this UV-microO 3 reactor in microcystins (MCs) degradation was also carried out. Experimental results indicated that the optimum air flux in the reactor equipped with 37 mm diameter quartz tube was determined to be 18∼25 L/h for efficient O 3 generation. The air pressure and humidity in UV-microO 3 reactor should be low enough in order to get optimum O 3 output. Moreover, microcystin-RR, YR, and LR (MC-RR, MC-YR, and MC-LR) could be degraded effectively by UV-microO 3 process. The degradation of different MCs was characterized by first-order reaction kinetics. The pseudofirst-order kinetic constants for MC-RR, MC-YR, and MC-LR degradation were 0.0093, 0.0215, and 0.0286 min −1 , respectively. Glucose had no influence on MC degradation through UV-microO 3 . The UV-microO 3 process is hence recommended as a suitable advanced treatment method for dissolved MCs degradation.
    Type of Medium: Online Resource
    ISSN: 2090-9063 , 2090-9071
    URL: Article
    DOI: 10.1155/2015/240703
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2015
    detail.hit.zdb_id: 2393625-3
    detail.hit.zdb_id: 2703077-5
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    Online Resource
  • 4
    Online Resource
    Online Resource
    Removal Characteristics of Organic Pollutants from Eutrophic Raw Water by Biological Pretreatment Reactors
    Hindawi Limited ; 2016
    In:  Journal of Chemistry Vol. 2016 ( 2016), p. 1-7
    Details
    In: Journal of Chemistry, Hindawi Limited, Vol. 2016 ( 2016), p. 1-7
    Abstract: Two biological contact oxidation reactors, cascade biofilm reactor (CSBR) and one-step biofilm reactor (OSBR), were used in this paper for pretreatment of eutrophic water from Lake Taihu in China. The CSBR was more effective and stable for eutrophic water treatment than OSBR, in terms of extracellular microcystin-LR, chlorophyll -a, DOC, and biodegradable dissolved organic carbon (BDOC) removal. Removal efficiencies of extracellular microcystin-LR and chlorophyll -a were 75.8% and 59.7% in CSBR and 60.5% and 53.0% after 2 h in OSBR. CSBR had much higher removal efficiency (34.3%) than OSBR (22.7%) for DOC, and CSBR could remove 67% BDOC, accounting for 34% of total DOC in source water. 11.5% of DOC was removed through means other than biological degradation, such as biofilm adsorption and bioflocculation. In CSBR at 5.5~13°C, 57.5% of atrazine was removed at 2 h hydraulic retention time, with background concentration of 136.5 ng/L. Meanwhile, removal efficiencies of three phthalic acid esters (PAEs) (dimethyl phthalate, di-(2-ethylhexyl) phthalate, and di-n-butyl phthalate) were 78.7%, 52.4%, and 85.3%, respectively. Only 35.2% of polycyclic aromatic hydrocarbons (PAHs) could be removed by CSBR with initial concentration of 21.5  μ g/L. The results indicated that CSBR is effective in low-molecular-weight organic pollution pretreatment and provides benefits in terms of effluent quality.
    Type of Medium: Online Resource
    ISSN: 2090-9063 , 2090-9071
    URL: Article
    DOI: 10.1155/2016/3151482
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2016
    detail.hit.zdb_id: 2393625-3
    detail.hit.zdb_id: 2703077-5
    Location Call Number Limitation Availability
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    Online Resource
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