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Dekui Wang,Hyung-Hyo Lee 한국정보기술학회 2021 한국정보기술학회논문지 Vol.19 No.3
Big data brings huge benefits to people, but also brings great risks to users privacy leakage. In view of the risk of user information privacy leakage in the big data environment, select the data use stage of the big data privacy protection life cycle to study user privacy protection. From the three aspects of technology, law, and management, a three-dimensional integration big data user privacy protection model is constructed, and three aspects are coordinated to achieve the optimization of user privacy protection in the data use stage of the big data environment.
Dekui Shen,Qian Liu,Rui Xiao,Huiyan Zhang,Mengxiang Fang 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.3
A mathematical model of thermal decomposition together with the flammability limit is proposed to describe the pyrolysis and spontaneous ignition of wood slab subjected to the radiation from a truncated-cone heater. The prominent physical and chemical phenomena were considered in the model, involving heat transfer in a solid, heat consumed by thermal decomposition reactions, the evaporation of moisture, re-radiation from pore surfaces inside a solid and so on. The numerical solution allows the prediction of in-depth temperature profiles, evolution of volatiles,variation of thermal conductivity, apparent mass loss (solid conversion) and ignition time. The different densities for wood species and effect of moisture content and grain orientation on thermal conductivity are also considered in the model, producing a good prediction of surface temperatures. This gives birth to the reasonable prediction on ignition time of wood by employing fixed surface temperature (400 oC) as ignition criterion. However, the analysis of constituent fractions for the species associated with the multi-components kinetic scheme should be included in the mathematical model to give a more precise prediction on the apparent mass loss of solid.
Centrality Degree, Opinion Leadership, and WOM of Nodes in Social Network Sites
DeKui Li,ByungKook Ha,JeeHee Cho 한국경영정보학회 2011 한국경영정보학회 학술대회논문집 Vol.2011 No.1
The WOM (Word-of-Mouth) is uncertain and uncontrollable, so marketers' interest turns to managing personal network in hope of managing WOM. In this regard, opinion leadership and social network analysis have become pivotal issues of WOM management. Central nodes, members having direct contacts with a great number of other members, play an important role in the WOM transmission as they can widely circulate information. Centrality degree, the counting of contacts of a node, is a sociometric technique used as a proxy for opinion leadership in lieu of a self-report method. In this paper, we have two purposes. First, we introduce two variables, centrality degree and prominence degree to jointly identify the true opinion leaders. While the centrality degree indicates the coverage capacity of opinion leaders, the prominence degree signifies the quality that the observed individuals' ideas and opinions are sought. Second, we attempt to reveal the behavior of opinion leaders regarding the WOM diffusion in that they generate as much NWOM as PWOM, as an evident of their unbiased opinion provisions.
Antimicrobial and Cytotoxic Activity of Endophytic Fungi from Lagopsis supina
Zhang Dekui,Sun Weijian,Xu Wenjie,Ji Changbo,Zhou Yang,Sun Jingyi,Tian Yutong,Li Yanling,Zhao Fengchun,Tian Yuan 한국미생물·생명공학회 2023 Journal of microbiology and biotechnology Vol.33 No.4
In this study, five endophytic fungi belonging to the Aspergillus and Alternaria genera were isolated from Lagopsis supina. The antimicrobial activity of all fungal fermented extracts against Staphylococcus and Fusarium graminearum was tested using the cup-plate method. Among them, Aspergillus ochraceus XZC-1 showed the best activity and was subsequently selected for large-scale fermentation and bioactivity-directed separation of the secondary metabolites. Four compounds, including 2- methoxy-6-methyl-1,4-benzoquinone (1), 3,5-dihydroxytoluene (2), oleic acid (3), and penicillic acid (4) were discovered. Here, compounds 1 and 4 displayed anti-fungal activity against F. graminearum, F. oxysporum, F. moniliforme, F. stratum, Botrytis cinerea, Magnaporthe oryzae, and Verticillium dahliae with diverse MIC values (128–512 μg/ml), which were close to that of the positive control antifungal, actidione (64–128 μg/ml). Additionally, compounds 1 and 4 also exhibited moderate antibacterial activity against S. aureus, Listeria monocytogenes, Escherichia coli, and Salmonella enterica, with low MIC values (8–64 μg/ml). Moreover, compounds 1 and 4 displayed selective cytotoxicity against cancer cell lines as compared with the normal fibroblast cells. Therefore, this study proposes that the endophytic fungi from L. supina can potentially produce bioactive molecules to be used as lead compounds in drugs or agricultural antibiotics.
Food Security Sensor Management Based on RIHA
Zhehui Xiao,Dekui Li,Chinling Chen,Jinlong Zhang 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.11
The coming of information age makes the integrated electronic food security sensor management in industrial field face new challenges. This paper takes the security management food security sensor management of food industry the industrial area as the researching object, discussing the architecture of ASAAC standard food security sensor management, by means of a RSSI-based Information Hiding Algorithm (RIHA) analysis method, it puts forward ideas of assessment on the food security sensor management safety. And uses RSSI (Received Signal Strength Indication) as hidden information carrier and designs. It does not affect original data or bring additional communication cost. The simulation results show that RIHA has high hidden information transmission accuracy without bringing additional communication energy consumption.
Thermal-balanced integral model for pyrolysis and ignition of wood
Rui Xiao,Dekui Shen,Mengxiang Fang,Wanki Chow 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.1
The pyrolysis and ignition of wood is of great importance to understand the initial stage of combustion,helping control the occurrence and spread of unwanted building and forestry fires. The development of a thermal-balanced model is introduced for examining the analytical relationship between the ignition time and external heat flux. The critical heat flux, one of the important fire-retardant characteristics of combustible solid, is determined from a correlation study between the ignition time and external heat flux. One of the thermal-balanced integral models, considering the effect of surface heat losses, average absorptivity and moisture content, is employed to give the prediction of surface temperature rise, ignition time and ignition temperature of the Aspen. The results show that the model readily and satisfactorily predicts ignition temperature and ignition time of wood with different moisture contents.
Xiaoxiang Jiang,Dekui Shen 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.10
Biomass-based activated carbonaceous fiber (ACF) was modified by nitric-acid oxidation under microwave heating (ACF-O) and then further treated by thioglycolic acid (ACF-S) to prepare carbon materials with high capability for the removal of Pb(II) ions. The physico-chemical properties of the original and modified ACF samples were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Zeta potential, Boehm titration, BET, Raman spectrum and X-ray photoelectron spectroscopy (XPS). It was found that modification treatments damage the pore and graphite crystalline structure of ACF, while the micropore structure is protected and extra oxygen-containing surface functional groups are grafted on its surface. The adsorption performance of the original and the modified ACF samples affected by adsorption conditions regarding to Pb(II) ion strength (10mg/L- 105mg/L), contact time (10min-120 min), pH value (2.5-6.5), and solvent temperature (15 oC-45 oC) was investigated through batch experiments. Compared to the maximum Pb(II) ion adsorption capacity of 75.24mg/g by ACF sample, the value was substantially improved by the integrated modification method (193.42mg/g for ACF-O and 209.21mg/g for ACF-S sample). The Biot number determined from the homogeneous surface diffusion model (HSDM) was between 1 and 100 for the original and modified ACF samples, suggesting that the adsorption process of Pb(II) ions is limited by both the surface diffusion and film mass transfer.