The Mediation Effect of Herd Behavior on the Impact of Trust on Purchase Intention: A Focus on Livestream E-commerce in China

Fan Zhou(Fan Zhou),Ki-Hyung Bae(Ki-Hyung Bae),De-Kui Li(De-Kui Li) 한국무역연구원 2023 무역연구 Vol.19 No.2

Fifth Generation Communication Performance of Poly(ether ketone ketone)/Modified Montmorillonite Substrate

Guang Kui Zhou,Xiao Dong Zhi,Deng Ming Pan,Tim Hsu,Jen-taut Yeh 한국고분자학회 2022 Macromolecular Research Vol.30 No.2

Quaternary ammonium salt modified montmorillonite (QASMMT) nanoplatelets were well dispersed in poly(ether ketone ketone) (PEKK) polymers to make pleasing fifth generation (5G) substrates. Substantially smaller dielectric properties and linear thermal expansion coefficient (LCTE) were found for each PEKKa xQASMMTy film series filled with small and appropriate QASMMT loadings. The dielectric constant (εr) and dielectric loss (tan δ) values acquired for each PEKKa xQASMMTy film series reduced to a lowest value as QASMMT loadings approached 3wt%. Satisfactory εr (2.59, 2.71, and 2.80 at 1 MHz), tan δ (0.0032, 0.0038, and 0.0042 at 1 MHz) and LCTE (~36.8×10-6/℃, 38.8×10-6/℃ and 40.5×10-6/℃) for 5G communication were acquired for PEKKa 97QASMMT3 films filled with only 3wt% optimum loading of QASMMT nano-platelets. In the meantime, the onset degradation temperatures acquired for each PEKKa xQASMMTy film series increased substantially with increasing QASMMT loadings. All free volume properties, such as, the radius of the free-volume-cavity or free-volume-cavity numbers per unit volume evaluated for every PEKKa xQASMMTy film sequence enlarged to a largest value, as QASMMT loadings approached an appropriate value of 3wt%. Substantial smaller εr and tan δ were acquired for PEKKa and PEKKa xQASMMTy with larger free volume properties. Possible reasons accounting for these substantially diminished dielectric and LCTE properties of PEKKa xQASMMTy films are proposed.

SOME ONE-DIMENSIONAL NOETHERIAN DOMAINS AND G-PROJECTIVE MODULES

Kui Hu,김환구,De Chuan Zhou 대한수학회 2023 대한수학회보 Vol.60 No.6

Let $R$ be a one-dimensional Noetherian domain with quotient field $K$ and $T$ be the integral closure of $R$ in $K$. In this note we prove that if the conductor ideal $(R:_KT)$ is a nonzero prime ideal, then every finitely generated reflexive (and hence finitely generated $G$-projective) $R$-module is isomorphic to a direct sum of some ideals.

Flat dimensions of injective modules over domains

Kui Hu,임정욱,De Chuan Zhou 대한수학회 2020 대한수학회보 Vol.57 No.4

Let $R$ be a domain. It is proved that $R$ is coherent when $IFD(R)\lst1$, and $R$ is Noetherian when $IPD(R)\lst1$. Consequently, $R$ is a $G$-Pr$\rm\ddot{u}$fer domain if and only if $IFD(R)\lst1$, if and only if ${\rm wG\mbox{-}gldim}(R)\lst1$; and $R$ is a $G$-Dedekind domain if and only if $IPD(R)\lst1$.

On strongly Gorenstein hereditary rings

Kui Hu,김환구,Fanggui Wang,Longyu Xu,De Chuan Zhou 대한수학회 2019 대한수학회보 Vol.56 No.2

In this note, we mainly discuss strongly Gorenstein hereditary rings. We prove that for any ring, the class of $SG$-projective modules and the class of $G$-projective modules coincide if and only if the class of $SG$-projective modules is closed under extension. From this we get that a ring is an $SG$-hereditary ring if and only if every ideal is $G$-projective and the class of $SG$-projective modules is closed under extension. We also give some examples of domains whose ideals are $SG$-projective.

FLAT DIMENSIONS OF INJECTIVE MODULES OVER DOMAINS

Hu, Kui,Lim, Jung Wook,Zhou, De Chuan Korean Mathematical Society 2020 대한수학회보 Vol.57 No.4

Let R be a domain. It is proved that R is coherent when IFD(R) ⩽ 1, and R is Noetherian when IPD(R) ⩽ 1. Consequently, R is a G-Prüfer domain if and only if IFD(R) ⩽ 1, if and only if wG-gldim(R) ⩽ 1; and R is a G-Dedekind domain if and only if IPD(R) ⩽ 1.

Fault diagnosis method of rolling bearing using principal component analysis and support vector machine

Ying-Kui Gu,Xiao-Qing Zhou,Dong-Ping Yu,Yan-Jun Shen 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.11

To effectively extract the fault feature information of rolling bearings and improve the performance of fault diagnosis, a fault diagnosis method based on principal component analysis and support vector machine was presented, and the rolling bearings signals with different fault states were collected. To address the limitation on effectively dealing with the raw vibration signals by the traditional signal processing technology based on Fourier transform, wavelet packet decomposition was employed to extract the features of bearing faults such as outer ring flaking, inner ring flaking, roller flaking and normal condition. Compared with the previous literature on fault diagnosis using principal component analysis (PCA) and support vector machine (SVM), one-to-one and one-to-many algorithms were taken into account. Additionally, the effect of four kernel functions, such as liner kernel function, polynomial kernel function, radial basis function and hyperbolic tangent kernel function, on the performance of SVM classifier was investigated, and the optimal hype-parameters of SVM classifier model were determined by genetic algorithm optimization. PCA was employed for dimension reduction, so as to reduce the computational complexity. The principal components that reached more than 95 % cumulative contribution rate were extracted by PCA and were input into SVM and BP neural network classifiers for identification. Results show that the fault feature dimensionality of the rolling bearing is reduced from 8-dimensions to 5-dimensions, which can still characterize the bearing status effectively, and the computational complexity is reduced as well. Compared with the raw feature set, PCA has a higher fault diagnosis accuracy (more than 97 %), and a shorter diagnosis time relatively. To better verify the superiority of the proposed method, SVM classification results were compared with the results of BP neural network. It is concluded that SVM classifier achieved a better performance than BP neural network classifier in terms of the classification accuracy and time-cost.

ON STRONGLY GORENSTEIN HEREDITARY RINGS

Hu, Kui,Kim, Hwankoo,Wang, Fanggui,Xu, Longyu,Zhou, Dechuan Korean Mathematical Society 2019 대한수학회보 Vol.56 No.2

In this note, we mainly discuss strongly Gorenstein hereditary rings. We prove that for any ring, the class of SG-projective modules and the class of G-projective modules coincide if and only if the class of SG-projective modules is closed under extension. From this we get that a ring is an SG-hereditary ring if and only if every ideal is G-projective and the class of SG-projective modules is closed under extension. We also give some examples of domains whose ideals are SG-projective.

A NOTE ON ARTINIAN LOCAL RINGS

Hu, Kui,Kim, Hwankoo,Zhou, Dechuan Korean Mathematical Society 2022 대한수학회보 Vol.59 No.5

In this note, we prove that an Artinian local ring is G-semisimple (resp., SG-semisimple, 2-SG-semisimple) if and only if its maximal ideal is G-projective (resp., SG-projective, 2-SG-projective). As a corollary, we obtain the global statement of the above. We also give some examples of local G-semisimple rings whose maximal ideals are n-generated for some positive integer n.

The Influence of Seller Reputation and Trust in Streamers on Live Stream Shopping Purchase Intention: The Moderation Effect of Country Image

Fan Zhou,De-Kui Li,Ki-Hyung Bae The International Academy of Global Business and T 2023 The International Academy of Global Business and T Vol.19 No.5

Purpose - Live streaming e-commerce continues to increase Chinese consumer enthusiasm for purchasing foreign products. The current research focus in the field of live streaming e-commerce is on exploring the impact of various factors on consumer purchase attitudes and intentions. This study aims to investigate the effects of seller reputation in traditional e-commerce and trust in streamers in live streaming e-commerce on consumer purchase intentions. Additionally, it aims to analyze how the country image of Korea moderates the effects of seller reputation and trust in streamers on purchase intentions. Design/Methodology/Approach - This study used the SmartPLS statistical software package to analyze a sample of 341 respondents. Structural Equation Modeling (SEM) was used to conduct path analysis and moderation effect analysis Findings - This study found that in live streaming e-commerce, seller reputation and trust in streamer significantly influence consumer purchase attitudes. Country image plays a moderating role in the relationship between seller reputation and attitude. However, country image does not moderate the relationship between trust in streamer and attitude. These findings contribute to our understanding of the factors that shape consumer attitudes, and illuminate the role of the country image as a moderator in e-commerce. Research Implications - This study has found that product country image plays a moderating role in the relationship between seller reputation and consumer purchase attitudes. It makes a theoretical contribution to existing e-commerce research, and explores the positive impact of product country image in cross-border e-commerce.