http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Dongjun Luo,Xiaoyun Wu,Xinwei Zheng,Yuping Hu 보안공학연구지원센터 2014 International Journal of Security and Its Applicat Vol.8 No.6
Cloud computing platforms are usually constructed as trusted virtual platforms based on trusted computing technologies. This is one of the most effective approaches to resolve cloud computing security problems. However, the protection of sensitive data in trusted virtual platforms is an important problem needed to be resolved. In this paper, we proposed a novel authorization protocol. The protocol assembled the functions of OIAP, OSAP and AACP protocols, and prevented all known attacks in existing authorization protocols. Moreover, it satisfied the property of exclusivity and was compatible with TCG TPM command formats. The protocol effectively protects the sensitive data from unauthorized accesses in trusted cloud computing platforms.
Study of Deflection Routing from an Information-theoretic Perspective
Xinwei Zheng,Yuping Hu,Dongjun Luo,Xiaoyun Wu 보안공학연구지원센터 2015 International Journal of Future Generation Communi Vol.8 No.1
Deflection routing is an effective way to improve the efficiency and reliability of data transmission in the network. Information theory, which is the foundation of channel communications, has not yet had a direct impact on network communications. In this paper, we study the deflection routing processes of point-to-point networks from an information-theoretic perspective. It is found that the packet routing processes, which can further be divided into path determination and path switching, are quite analogous to channel communications. And such a corresponding relationship makes it possible to analyze routing processes and its performance with models and concepts in the information theory.
( Xiaoyun Zhang ),( Zhen Lin ),( Maurice Tibiru Apaliya ),( Xiangyu Gu ),( Xiangfeng Zheng ),( Lina Zhao ),( Mandour Haydar Abdelhai ),( Hongyin Zhang ),( Weicheng Hu ) 한국미생물생명공학회(구 한국산업미생물학회) 2017 Journal of microbiology and biotechnology Vol.27 No.12
Citrinin (CIT) is a toxic secondary metabolite produced by fungi belonging to the Penicillium, Aspergillus, and Monascus spp. This toxin has been detected in many agricultural products. In this study, a strain Y3 with the ability to eliminate CIT was screened and identified as Cryptococcus podzolicus, based on the sequence analysis of the internal transcribed spacer region. Neither uptake of CIT by cells nor adsorption by cell wall was involved in CIT elimination by Cryptococcus podzolicus Y3. The extracellular metabolites of Cryptococcus podzolicus Y3 stimulated by CIT or not showed no degradation for CIT. It indicated that CIT elimination was attributed to the degradation of intracellular enzyme(s). The degradation of CIT by C. podzolicus Y3 was dependent on the type of media, yeast concentration, temperature, pH, and initial concentration of CIT. Most of the CIT was degraded by C. podzolicus Y3 in NYDB medium at 42 h but not in PDB medium. The degradation rate of CIT was the highest (94%) when the concentration of C. podzolicus Y3 was 1 × 10<sup>8</sup> cells/ml. The quantity of CIT degradation was highest at 28°C, and there was no degradation observed at 35°C. The study also showed that acidic condition (pH 4.0) was the most favorable for CIT degradation by C. podzolicus Y3. The degradation rate of CIT increased to 98% as the concentration of CIT was increased to 20 μg/ml. The toxicity of CIT degradation product(s) toward HEK293 was much lower than that of CIT.
Xiaoyun Han,Lianlian Hua,Lin Hu 글로벌지식마케팅경영학회 2018 Global Marketing Conference Vol.2018 No.07
Despite the increasing attention to customer engagement (CE) by practitioners and academics, extant studies have largely been restricted to conceptualized relationships without empirical testing (So, King, & Sparks, 2014). Drawing on social identity theory and social exchange theory, this study develops a research model delineating the relationship between customer identification (CI), CE and customer purchasing behaviors in virtual communities. The model was tested with structural equation modeling and survey data from 513 members of two virtual tourism communities. Results indicate that both customer-community identification and customer-customer identification (constituting two classifications of CI) have directly positive effect on customer engagement attitude, on which the duration of membership in a community has a moderating effect. Additionally, customer-customer identification influences customer engagement behavior directly and positively, of which customer engagement attitude is the psychological foundation. Finally, customer engagement attitude and customer engagement behavior will promote customers’ purchasing behaviors. The contribution of this paper is that CE has been empirically validated to compose of customer engagement attitude and customer engagement behavior these two separate variables, and CI is testified to be an antecedent rather than a dimension of CE, in line with the standpoints proposed by Algesheimer, Dholakia, and Herrmann (2005).Through the current investigation, empirical studies into the concept connotation and formation mechanism of CE are enriched, and the insight into customer behavior management and CE marketing is intensified.
Synthesis and Antifungal Activity of Novel Triazole Derivatives
Yongzheng Yan,Shichong Yu,Xiaoyun Chai,Honggang Hu,Qiuye Wu 대한약학회 2011 Archives of Pharmacal Research Vol.34 No.10
A series of novel azoles (a-v), which are analogues of fluconazole, have been designed and synthesized as potential antifungal agents by the click reaction. The click reaction approach toward the synthesis of novel 1,2,3-triazolyl linked triazole antifungal derivatives a-v was achieved by Cu(I)-catalyzed 1,3-dipolar cycloaddition of propargylated intermediate 5 with substituted azidomethyl benzene. In addition, the target compounds tested can increase antifungal activity.
Methanol aromatization over CrZn-modified HZSM-5 catalysts
Bei Liu,Siwu Lu,Enzhou Liu,Xiaoyun Hu,Jun Fan 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.4
HZSM-5 (HZ) zeolite co-modified with Zn and second promoters (Zr, Ce, Mo and Cr) was synthesized and the aromatization of methanol over the modified HZ in a fixed-bed reactor was investigated. The results of catalytic tests revealed that the methanol conversion and yield of benzene, toluene, and xylene (BTX) over the Cr, Zn comodification HZ (CrZn/HZ) were higher than that over ZrZn/HZ, CeZn/HZ, and MoZn/HZ. The catalysts were characterized by XRD, SEM, TEM, XPS, N2 isothermal adsorption-desorption and NH3-TPD. The results suggest that Zn species exist in two forms in the HZ zeolite. One is ZnO particle, the other one is ZnOH+, which significantly improveds the yield of BTX. Furthermore, the Cr species on the external surface promoted the dispersion of ZnO, increased the amount of ZnOH+, which further improved the yield of BTX. In addition, the optimal Cr2Zn1/HZ catalyst exhibited better catalytic performance and prolonged lifetime of reaction.
Yao, Fei,Sun, Yang,Tan, Chunlei,Wei, Song,Zhang, Xiaojuan,Hu, Xiaoyun,Fan, Jun Korean Chemical Society 2011 대한화학회지 Vol.55 No.6
Using tetrabutyl titanate as precursor, $Eu^{3+}$ doped $TiO_2$ nano-powder was prepared by sol-gel method, the nature of luminescence of nano-powder was studied. The interaction of chlorpyrifos with $Eu^{3+}$ doped $TiO_2$ was studied by absorption and fluorescence spectroscopy. The results indicated the fluorescence intensity of $Eu^{3+}$ doped $TiO_2$ was quenched by chlorpyrifos and the quenching rate constant ($k_q$) was $1.24{\times}10^{11}\;L/mol{\cdot}s$ according to the Stern-Volmer equation. The dynamics of photoinduced electron transfer from chlorpyrifos to conduction band of $TiO_2$ nanoparticle was observed and the mechanism of electron transfer had been confirmed by the calculation of free energy change (${\Delta}G_{et}$) by applying Rehm-Weller equation as well as energy level diagram. A new rapid method for detection of chlorpyrifos was established according to the fluorescence intensity of $Eu^{3+}$ doped $TiO_2$ was proportional to chlorpyrifos concentration. The range of detection was $5.0{\times}10^{-10}-2.5{\times}10^{-7}mol/L$ and the election limit ($3{\sigma}$) was $3.2{\times}10^{-11}$ mol/L.