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Guo, Xin,Xiao, Min,Gao, Yu-er,Wang, Qingyu,Wan, Yihao The Korean Institute of Power Electronics 2020 JOURNAL OF POWER ELECTRONICS Vol.20 No.5
Under unbalanced grid conditions, the controller design of a three-phase pulse width modulation (PWM) rectifier is based on an instantaneous power model. By calculating the current references of the converter according to the instantaneous power model, traditional voltage-oriented control (VOC) methods realize the positive-sequence and negative-sequence active and reactive current control of the converter separately using the proportional-integral (PI) controller. However, due to the inner current loop control structure of the traditional VOC method, it is impossible to realize the regulation of all six power components in a common instantaneous power model under an unbalanced grid. Meanwhile, the control performance of the traditional VOC method with a PI controller is degraded under the circuit parameters uncertainty condition. In this paper, a fixed switching frequency robust power model predictive control method (FRP-MPC) is proposed for three-phase PWM rectifiers under the unbalanced grid condition. The proposed control strategy has a number of advantages. An improved instantaneous power model is used for the fixed switching frequency model predictive controller design under the unbalanced grid condition, which has less power variables than the common instantaneous power model. The robustness of the MPC controller is improved by adding a robust item into the predictive model under circuit parameters uncertainty. Simulation and experiment results verify the effectiveness of the proposed control method.
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Guo, Xin,Ren, Hai-Peng,Liu, Ding The Korean Institute of Power Electronics 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.2
The compound active clamp zero voltage soft switching (CACZVS) three-phase power factor correction (PFC) converter has many advantages, such as high efficiency, high power factor, bi-directional energy flow, and soft switching of all the switches. Triple closed-loop PI controllers are used for the three-phase power factor correction converter. The control objectives of the converter include a fast transient response, high accuracy, and unity power factor. There are six parameters of the controllers that need to be tuned in order to obtain multi-objective optimization. However, six of the parameters are mutually dependent for the objectives. This is beyond the scope of the traditional experience based PI parameters tuning method. In this paper, an improved chaotic particle swarm optimization (CPSO) method has been proposed to optimize the controller parameters. In the proposed method, multi-dimensional chaotic sequences generated by spatiotemporal chaos map are used as initial particles to get a better initial distribution and to avoid local minimums. Pareto optimal solutions are also used to avoid the weight selection difficulty of the multi-objectives. Simulation and experiment results show the effectiveness and superiority of the proposed method.
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Guo Xin,Xie Yong-Xin,Guo Chen,Wei Jing-Lin,Yang Hui-Fang 대한독성 유전단백체 학회 2021 Molecular & cellular toxicology Vol.17 No.2
Background In recent years, studies have shown that cyfluthrin is harmful to the reproductive system. Lycium barbarum polysaccharide may be a protective agent. Objective To investigate the effect of cyfluthrin (Cy) on testosterone B (inhibin B, INHB) in male rats and the intervention of Lycium barbarum polysaccharide (LBP). Results Compared with the control group, the mRNA and protein expression levels of INH α and INH βB in the testis tissue decreased, and the difference was statistically significant (P < 0.05). The LBP intervention group can significantly increase the expression level, and the difference is statistically significant (P < 0.05). Conclusion The decrease of INHα and INHβB expression caused by Cy exposure indicates that Cy has a toxic effect on the testis of rats, and the addition of LBP has a certain protective effect on the testis of rats. Background In recent years, studies have shown that cyfluthrin is harmful to the reproductive system. Lycium barbarum polysaccharide may be a protective agent. Objective To investigate the effect of cyfluthrin (Cy) on testosterone B (inhibin B, INHB) in male rats and the intervention of Lycium barbarum polysaccharide (LBP). Results Compared with the control group, the mRNA and protein expression levels of INH α and INH βB in the testis tissue decreased, and the difference was statistically significant (P < 0.05). The LBP intervention group can significantly increase the expression level, and the difference is statistically significant (P < 0.05). Conclusion The decrease of INHα and INHβB expression caused by Cy exposure indicates that Cy has a toxic effect on the testis of rats, and the addition of LBP has a certain protective effect on the testis of rats.
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Guoxin LI 글로벌지식마케팅경영학회 2014 Global Marketing Conference Vol.2014 No.11
The performance of an organization largely depends upon the strategy-environment fit (Mintzberg, 1979). The success of business-level strategy is contingent on industry environment characteristics (Pelham, 1999). Under the strategic fit, new ventures need to match their strategies of market, product with external environment. In different contextual situations, a new venture should employ appropriate management practices that positively impact its performance. The strategic fit provides important theoretical foundations for understanding how strategies drive firm performance. Today, technology-based start-up ventures and corporate entrepreneurship both embrace emerging markets and emerging technologies as the core of their competitive advantage (Thukral, Ehr, Walsh, Groen, & Sijde, 2008). For these new ventures, it is important to set up market orientation strategy at the beginning of founding. New ventures need to explore market opportunities and respond to market requirements. Proactive and responsive market orientations are two dimensions of market orientation considering to latent and current market needs ((Narver, Slater, & Maclachlan, 2004)). Current studies acquiescently treat proactive and responsive as two types of market orientations. However, further study need to clarify whether and what extent and under what contextual situations new ventures pursue two dimensions of market orientation strategy. In specifically, does pursuit of a hybrid market orientation lead to superior performance relative to a pure one? What extent should a new venture emphasize relative pure strategy which can help it to fit its strategy with performance objectives? Furthermore, is the market orientation strategy purity equally important in both emerging and established market conditions and industrial technology standards? This paper proposes hypotheses of positive relationship between market orientation strategy purity and new venture performance. And, Market needs has a moderating role on the relationship of MO purity and new venture performance. That is, for emerging market, the MO purity will exert a weaker influence on the new venture performance. Technological uncertainty has a moderating role on the relationship of MO purity and new venture performance. That is, for emerging technology, the MO purity (especially proactive market orientation) will exert a stronger influence on the new venture performance.
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Guoxin LI 글로벌지식마케팅경영학회 2014 Global Marketing Conference Vol.2014 No.7
The performance of an organization largely depends upon the strategy-environment fit (Mintzberg, 1979). The success of business-level strategy is contingent on industry environment characteristics (Pelham, 1999). Under the strategic fit, new ventures need to match their strategies of market, product with external environment. In different contextual situations, a new venture should employ appropriate management practices that positively impact its performance. The strategic fit provides important theoretical foundations for understanding how strategies drive firm performance. Today, technology-based start-up ventures and corporate entrepreneurship both embrace emerging markets and emerging technologies as the core of their competitive advantage (Thukral, Ehr, Walsh, Groen, & Sijde, 2008). For these new ventures, it is important to set up market orientation strategy at the beginning of founding. New ventures need to explore market opportunities and respond to market requirements. Proactive and responsive market orientations are two dimensions of market orientation considering to latent and current market needs ((Narver, Slater, & Maclachlan, 2004)). Current studies acquiescently treat proactive and responsive as two types of market orientations. However, further study need to clarify whether and what extent and under what contextual situations new ventures pursue two dimensions of market orientation strategy. In specifically, does pursuit of a hybrid market orientation lead to superior performance relative to a pure one? What extent should a new venture emphasize relative pure strategy which can help it to fit its strategy with performance objectives? Furthermore, is the market orientation strategy purity equally important in both emerging and established market conditions and industrial technology standards? This paper proposes hypotheses of positive relationship between market orientation strategy purity and new venture performance. And, Market needs has a moderating role on the relationship of MO purity and new venture performance. That is, for emerging market, the MO purity will exert a weaker influence on the new venture performance. Technological uncertainty has a moderating role on the relationship of MO purity and new venture performance. That is, for emerging technology, the MO purity (especially proactive market orientation) will exert a stronger influence on the new venture performance.
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THE INFLUENCE OF ARTIFICIAL EMPATHY ON CUSTOMER ACCPETANCE OF ARTIFICIAL INTELLIGENCE SERVICE AGENTS
Guoxin Li,Hao Wu,Bo Lu,Yangfang Niu 글로벌지식마케팅경영학회 2023 Global Marketing Conference Vol.2023 No.07
With the evolution of Artificial intelligence (AI), emotional artificial intelligence service agents (AISA) have become common in service industry. However, how artificial empathy of AISA contributes to customer acceptance remains an open question. This study draws on Anthropomorphism Theory and Customer AI Experience Theory to examine whether and how artificial empathy has influence on customer acceptance of AISA. Evidence from three experiments (N=1057) designed by the Experimental vignette method (EVM) shows that: (1) artificial empathy including perspective-taking, empathic concern and emotional contagion has a positive impact on customer acceptance of AISA (study 1); (2) customer AI experience (emotional experience quality, social experience activation and social experience quality) mediates the relationship between artificial empathy and customer acceptance of AISA (study 2); (3) artificial empathy for hedonic (vs. utilitarian) services leads to a stronger effect on customer acceptance of AISA (study 3). This paper enriches our understanding of artificial empathy and provides practical guidance for practitioners strategically managing AISA services in AI-enabled marketing interactions.
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Electronic Word-of-Mouth in B2C Virtual Communities
Guoxin Li1,Statia Elliot,Chris Choi 한국마케팅과학회 2010 마케팅과학연구 Vol.20 No.3
Virtual communities (VCs) have developed rapidly, with more and more people participating in them to exchange information and opinions. A virtual community is a group of people who may or may not meet one another face to face, and who exchange words and ideas through the mediation of computer bulletin boards and networks. A business-to-consumer virtual community (B2CVC) is a commercial group that creates a trustworthy environment intended to motivate consumers to be more willing to buy from an online store. B2CVCs create a social atmosphere through information contribution such as recommendations, reviews, and ratings of buyers and sellers. Although the importance of B2CVCs has been recognized, few studies have been conducted to examine members’ word-of-mouth behavior within these communities. This study proposes a model of involvement, statistics, trust, “stickiness,” and word-of-mouth in a B2CVC and explores the relationships among these elements based on empirical data. The objectives are threefold: (i) to empirically test a B2CVC model that integrates measures of beliefs, attitudes, and behaviors; (ii) to better understand the nature of these relationships, specifically through word-of-mouth as a measure of revenue generation; and (iii) to better understand the role of stickiness of B2CVC in CRM marketing. The model incorporates three key elements concerning community members: (i) their beliefs, measured in terms of their involvement assessment; (ii) their attitudes, measured in terms of their satisfaction and trust; and, (iii) their behavior, measured in terms of site stickiness and their word-of-mouth. Involvement is considered the motivation for consumers to participate in a virtual community. For B2CVC members, information searching and posting have been proposed as the main purpose for their involvement. Satisfaction has been reviewed as an important indicator of a member’s overall com-munity evaluation, and conceptualized by different levels of member interactions with their VC. The formation and expansion of a VC depends on the willingness of members to share information and services. Researchers have found that trust is a core component facilitating the anonymous interaction in VCs and e-commerce, and therefore trust-building in VCs has been a common research topic. It is clear that the successof a B2CVC depends on the stickiness of its members to enhance purchasing potential. Opinions communicated and information exchanged between members may represent a type of written word-of-mouth. Therefore, word-of-mouth is one of the primary factors driving the diffusion of B2CVCs across the Internet. Figure 1 presents the research model and hypotheses. The model was tested through the implementation of an online survey of CTrip Travel VC members. A total of 243 collected questionnaires was reduced to 204 usable questionnaires through an empirical process of data cleaning. The study’s hypotheses examined the extent to which involvement, satisfaction, and trust influence B2CVC stickiness and members’ word-of-mouth. Structural Equation Modeling tested the hypotheses in the analysis, and the structural model fit indices were within accepted thresholds: χ2/df was 2.76, NFI was .904, IFI was .931, CFI was .930, and RMSEA was .017. Results indicated that involvement has a significant influence on satisfaction (p<0.001, β=0.809). The proportion of variance in satisfaction explained by members’ involvement was over half (adjusted R2=0.654), reflecting a strong association. The effect of involvement on trust was also statistically significant (p<0.001, β=0.751), with 57 percent of the variance in trust explained by involvement (adjusted R2=0.563). When the construct “stickiness” was treated as a dependent variable, the proportion of variance explained by the variables of trust and satisfaction was relatively low (adjusted R2=0.331).
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Zhang, Guoxin,Ha, Seon-Ah,Kim, Hyun K.,Yoo, Jinah,Kim, Sanghee,Lee, Youn S.,Hur, Soo Y.,Kim, Yong W.,Kim, Tae E.,Park, Yong G.,Wang, Jing,Yang, Yang,Xu, Zekuan,Song, Eun Y.,Huang, Zuhu,Jirun, Peng,Zho IOS Press 2012 Disease markers Vol.32 No.4
<P>Hepatocellular carcinoma (HCC) is one of the most frequent malignant tumors in the world. The only serological marker widely used for the diagnosis of HCC is alpha-fetoprotein (AFP). Despite that AFP is widely used for the diagnosis of HCC, it has a limit as a serological marker due to its low sensitivity and specificity. The human cervical cancer proto-oncogene 1 (HCCR-1) was previously reported as a new biomarker for HCC. To further evaluate the HCCR-1 as a biomarker for HCC, we conducted the prospective cohort study. We evaluated the significance of simultaneous measurement of 2 tumor markers in the diagnosis of HCC in China, Japan and Korea. Two markers for HCC, AFP and HCCR-1, were measured in the sera obtained from 1,338 patients at the time of initial diagnosis of HCC. Of the 1338 HCC patients, 616 (46%) and 686 (51.3%) were sero-positive for AFP and HCCR-1, respectively. The positive rate for HCC was increased up to 74.1% in combined use of AFP and HCCR-1. Many cases (54%) for AFP-negative HCC were positive for HCCR-1 and vice versa. More importantly, the diagnostic rate for small HCC (< 2 cm) was significantly improved in the combined analysis of AFP and HCCR-1 to 56.9% although it was only 40.1% and 23.4% in the single analysis of HCCR-1 and AFP, respectively. Our result suggests that the HCCR-1 could be an useful biomarker for HCC while the diagnostic rate could be significantly improved in the combined use of HCCR-1 and AFP.</P>
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