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Extended Role-Based Access Control with Context-Based Role Filtering
( Gang Liu ),( Runnan Zhang ),( Bo Wan ),( Shaomin Ji ),( Yumin Tian ) 한국인터넷정보학회 2020 KSII Transactions on Internet and Information Syst Vol.14 No.3
Activating appropriate roles for a session in the role-based access control (RBAC) model has become challenging because of the so-called role explosion. In this paper, factors and issues related to user-driven role management are analysed, and a session role activation (SRA) problem based on reasonable assumptions is proposed to describe the problem of such role management. To solve the SRA problem, we propose an extended RBAC model with context-based role filtering. When a session is created, context conditions are used to filter roles that do not need to be activated for the session. This significantly reduces the candidate roles that need to be reviewed by the user, and aids the user in rapidly activating the appropriate roles. Simulations are carried out, and the results show that the extended RBAC model is effective in filtering the roles that are unnecessary for a session by using predefined context conditions. The extended RBAC model is also implemented in the Apache Shiro framework, and the modifications to Shiro are described in detail.
A simple seed-embedded method to prepare ZIF-8 membranes supported on flexible PESf hollow fibers
Hangliao Zhang,Xiaobin Wang,Luyang Wei,Bo Meng,Xiaoyao Tan,Wanqin Jin,Shaomin Liu 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.72 No.-
With intrinsic porous structure, unique chemical versatility and abundant application opportunities,MOF membranes have attracted substantial research enthusiasm. Most of these supported MOFmembranes are prepared on the rigid ceramic substrates. If the MOF membrane possessesflexibility, theapplication opportunities will be expanded. This paper presents the synthesis of ZIF-8 membranes on theflexible polyethersulfone (PESf) hollowfibers by using a facile seed-embedded method. The resultantmembranes were characterized by scanning electron microscopy, energy dispersive X-ray, X-raydiffraction and fourier transform infrared spectroscopy. The prepared membranes were in a continuousand compact structure and showed good molecular sieve performance of H2 over CO2, N2 and CH4 with H2permeance up to 1.110 5 mol m 2 s 1 Pa 1. Due to the preferential adsorption, ZIF-8/PESf compositemembrane exhibited high permeance of H2, N2, and CH4 compared to CO2, showing potential applicationsin efficient CO2 capture from industrial mixtures. The association between the gas permeation, theamount of embedded ZIF-8 crystals and the membrane thickness was also clarified. The reproducibilitywas significantly improved compared to the conventional secondary seeding method. Attributed to thestrong adhesion between the ZIF-8 and the PESf, the membranes displayed excellent stability andflexibility which could sustain bending up to 90 without breaking the ZIF-8 membrane. This seedembeddedmethod is not only simple, but also has good reproducibility and scalability.
Xiu-Shi Yang,Li-Li Wang,Xian-Rong Zhou,Shaomin Shuang,Zhi-Hua Zhu,Nan Li,Yan Li,Fang Liu,San-Cai Liu,Ping Lu,Guixing Ren,Chuan Dong 한국식품과학회 2013 Food Science and Biotechnology Vol.22 No.6
Quantitative detection of protein, fat, starch,and amino acids in foxtail millet using Fourier transformnear-infrared spectroscopy (NIRS) was investigated. Foxtail millet samples (n=259) were analyzed using NIRS. Spectral data were linearized with data from chemicalanalyses. Calibration models were established using apartial least-squares (PLS) algorithm with cross-validation. Optimized models were tested using external validation setsamples with coefficients of determination in the externalvalidation (R2val) of >0.90. Residual predictive deviation(RPD) values were nearly equal to or >2.5 for crudeprotein, alanine, aspartic acid, glutamic acid, isoleucine,leucine, and serine. However, for glycine, histidine,phenylalanine, proline, threonine, tyrosine, and valine, theR2val values were >0.83 and RPD values were nearly equalto or >2.0. For crude fat, total starch, arginine, and lysine,the R2val values were >0.70 and RPD values were >1.5. NIRS is a rapid determination tool for foxtail milletbreeding, and for quality control.
Size-tailored microwave absorption and reaction activity of Co3O4 nanocatalysts
Hoang M. Nguyen,Chi M. Phan,Gia Hung Pham,Yusuke Asakuma,Robert Vagnoni,Shaomin Liu 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.94 No.-
Microwave (MW)-assisted heterogeneous catalytic chemical reactions have opened advanced routinesover the conventional methodology. MW absorption ability of catalyst governed by its particle size is theforemost important factor to be considered before designing catalysts for such MW-based chemistry. Despite considerable interest in applying metallic-based catalysts for MW-assisted reactions, theinfluences of particle size on catalyst’s MW absorption ability and its resultant activity remain elusive. Here, we report an effective approach to tailor the MW absorption ability of Co3O4 catalyst via controllingits particle size during the crystal growth. A developed theoretical model verified that a capping agentcould regulate Co3O4 particle size effectively. For the unsupported Co3O4 catalysts, smaller particle sizepossessed higher MW absorption capacity and thereby delivered higher activity for MW-assisted bireformingof methane. High conversion of 63% CH4 and a syngas ratio (H2/CO) of 2.2 was achieved withthe smallest Co3O4 particles, at 20 nm. In contrast, the supported Co3O4 samples required larger particlesto ensure adequate exposure to the incident MW, which is partially covered by MW-inert support. Theresults disclose that by tailoring particles size appropriately, metallic-based catalysts can be optimisedfor MW-based chemical reactions.
Ergonomic Development and Evaluation of UI Design for Optical Brain- Machine Interface (OBMI) System
Xin Cui(최신아),Hayoung Jung(정하영),Halim Kim(김하림),Yang Xiaopeng(양샤오펑),Linqing Feng(펭린칭),Shaomin Zhang(장샤오민),Mingkang Li(리밍캉),Changhao Liu(리우창하오),Jiawei Han(한지아웨이),Ruixue Wang(왕루이수에),Heecheon You(유희천) 대한인간공학회 2020 대한인간공학회 학술대회논문집 Vol.2020 No.10
The effect of A-site element on CO2 resistance of O2-selective La-based perovskite hollow fibers
Jian Gao,Yutai Lun,Yadi Hu,Zijian You,Xiaoyao Tan,Shaobin Wang,Jaka Sunarso,Shaomin Liu 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.53 No.-
Oxygen-selective mixed ionic-electronic conducting (MIEC) ceramic membrane technology enables clean coal combustion and membrane reactor for green chemical synthesis. To be practical in these applications that involve CO2 presence, the membrane materials should have simultaneously high CO2 resistance and oxygen permeation fluxes. This work probed these properties for the perovskite oxide family of La0.6X0.4FeO3-d (X = Mg, Ca, Sr, or Ba), i.e., La0.6Mg0.4FeO3-d (LMF), La0.6Ca0.4FeO3-d (LCF), La0.6Sr0.4FeO3-d (LSF), and La0.6Ba0.4FeO3-d (LBF) in the hollow fiber membrane geometry that is highly suitable for industrial application. LCF hollow fiber displayed the best balance in CO2 resistance and oxygen permeation fluxes.
Jian Song,Claudia Li,Shao Zhang,Kai Wang,Bo Meng,Xiaoyao Tan,Jaka Sunarso,Shaomin Liu 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.107 No.-
BaCeO3-based ceramics are a unique class of perovskites that exhibit protonic and oxygen ionic conduction,which are ideal for high temperature hydrogen separation applications. This work features Sc-dopedBCFe composites with nominal composition of BaCe0.70Fe0.30-xScxO3d (BCFSc) (x = 0, 0.05, 0.1, 0.15, and0.2) that exhibit enhanced thermal, chemical, and mechanical stability. The BCFSc20 (x = 0.20) hollowfiber membranes demonstrated the highest hydrogen and oxygen fluxes among the Sc-doped compositesof up to 0.32 and 0.20 mL min1 cm2, respectively, at 1000 C. The BCFSc20 hollow fibers also displayedexcellent stability under the hydrogen and oxygen permeation environments, while the permeation performanceof the other BCFSc samples with low Sc content gradually deteriorated over the 120-h stabilitytest.
Nabil Majd Alawi,Jaka Sunarso,Gia Hung Pham,Ahmed Barifcani,Minh Hoang Nguyen,Shaomin Liu 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.85 No.-
Dry reforming of methane (DRM) is an attractive route to convert CH4 and CO2 into syngas (a mixture ofCO and H2). In this work, the performance of microwave-assisted DRM at atmospheric pressure (interms of CH4 and CO2 conversions, H2 and CO selectivities, H2 and CO yields, and H2 to CO ratio) isstudied as functions of additive gasflow rate, microwave power, CO2 to CH4 inlet supply ratio, andreaction time. Two additive gases were used, i.e., nitrogen and argon. Microwave-assisted DRMexperiments in both gases show identical trend of conversions, selectivities, yields, and product ratio. DRM performances in both additive gases atmosphere were stable for up to 8 h. Under the sameoperating conditions, using Ar as an additive gas, however, led to higher H2 and CO selectivities andyields and thus, higher H2 to CO ratio relative to using N2 as an additive gas. Maximum CH4 and CO2conversions of 79.35% and 44.82%, H2 and CO selectivities of 50.12% and 58.42%, H2 and CO yields of39.77% and 32.89%, and H2 to CO ratio of 0.86 were obtained at 700 W and N2, CO2, and CH4 flow rates of1.5, 0.4, and 0.2 L min 1, respectively.
Huina Wang,Xiaobin Wang,Bo Meng,Xiaoyao Tan,Kee Shyuan Loh,Jaka Sunarso,Shaomin Liu 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.60 No.-
Hydrogen share in the energy market has increased significantly in line with greater demand for zero emission fuel and the development of novel production routes via renewable resources. The application of mixed protonic–electronic conducting (MPEC) ceramic membrane within the hydrogen production process is an innovative route that enables high purity hydrogen production with low cost. This review provides readers a brief summary of the research efforts on MPEC ceramic membrane for hydrogen separation as well as the membrane reactor for hydrogen production and dehydrogenation or hydrogenation reactions. Most of the existing MPEC ceramic membranes come from either a single-phase or a dual-phase membrane. We discuss the working principles, the performances, the advantages and disadvantages, and the main issues of all these membranes. Major emphasis of the review is to cover the literature published in the last ten years since the earlier progress has been well documented by the previously existing reviews. We also put forward recommendations for future research direction in this topic.