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Qi-Jia Liu,김영길 한국무역연구원 2024 무역연구 Vol.20 No.1
Purpose – The purpose of this paper is to explore the tripartite relationship between the government, universities, and enterprises in the process of improving China’s innovation index. We hope to gain an in-depth understanding of the dynamic game process among these three, and how various factors affect the way they cooperate in this process. Design/Methodology/Approach – Based on evolutionary game theory as a research tool, we constructed a tripartite evolutionary game model of universities, government, and commercial institutions, and analyzed the stability of each party's strategic choices and the relationship between the influence of each element. Findings – By simulating strategy combinations and the evolution process in different contexts, we derived the conditions for the occurrence of stable strategy combinations among universities, governments, and business organizations. Through the above study, we found that stable strategy combinations among government, universities, and enterprises are crucial in promoting the development of China’s innovation index. Research Implications – This study has important theoretical significance for understanding the dynamic relationship among government, universities, and firms, and also provides practical guidance for policy makers. Through this study, policy makers can have a clearer understanding of the needs and interests of each party, so that they can formulate more effective policies to promote the development of innovation activities.
Qi Jia,Gangui Yan,Wenbo Hu,Kan Liu,Junxi Wang 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.1
Aiming at the sub-synchronous oscillation (SSO) problem that direct-drive permanent magnetic synchronous generator (PMSG) based wind farm under low operating conditions connects to the grid, based on the idea of graphical block modeing, the wind turbine generation (WTG), collector circuit and grid are regarded as discrete components. On the basis of establishing detailed models of each component, two linearized models of direct-drive PMSG based wind farm under different collector circuit topological structure is constructed. Wind farm impedance model is constructed based on state space equation of linearized model. The infl uences of current inner loop control parameters, grid strength, operating conditions on SSO characteristics are analysed. The diff erence between the two models in the study of SSO is compared. Finally, a time-domain simulation model of direct drive PMSG based wind farm connected to grid is built in EMTDC/PSCAD and the validity of the theoretical analysis is verifi ed.
Jia-Qi Chu,박창식,유명조,전무형,김명철 한국임상수의학회 2008 한국임상수의학회지 Vol.25 No.3
To investigate the genotypic diversity of the porcine reproductive and respiratory syndrome viruses (PRRSV) in Korea, we examined 92 clinical samples from three provinces by RT-PCR and a nested PCR, and the complete open-reading frame 7 (ORF 7) sequences of 15 samples selected from 72 PCR-positive specimens were analyzed. When we compared nucleotide (amino acid) sequences of 80 isolates from Korea and overseas countries, the sequences of 7 samples belonged to North American (NA)-genotype, and those of 8 samples, to European (EU)-genotype. The nucleotide (amino acid) identities between two genotypes were 63.7% (59.8%) to 65.1% (63.1%). When compared with NA prototype VR-2332, the 7 strains of NA-genotype shared 89.8% (93.6%) to 91.2% (96.0%) identity of nucleotide (amino acid) sequence. The 8 strains of EU-type shared 93.6% (92.3%) to 94.3% (93.8%) identity of nucleotide (amino acid) sequence as compared to EU prototype Lelystad. In phylogenetic tree analysis by neighborjoining method, all of the 8 EU-type strains were clustered into group 4 distinct from EU-prototype Lelystad (group 1). In NA-genotype, 24 domestic isolates reported previously and the 7 strains of NA-type determined in this study were clustered into group 1, while US prototype VR 2332 was classified into different group (group 2). These results suggest that emergence of EU-genotype and the dual-infection of NA- and EU-genotypes may be prevalent in the pig farms in Korea. The high degree of genetic diversity of field PRRSVs should be taken into consideration for control and preventive measures.
( Jia Qi Chu ),( Xu Min Hu ),( Myung Cheol Kim ),( Chang Sik Park ),( Moo Hyung Jun ) 한국가축위생학회 2009 韓國家畜衛生學會誌 Vol.32 No.1
We studied the seroprevalence of four respiratory pathogens in Korean swine farms located in Chungnam, Chungbuk, Gyeongnam and Gyeongbuk provinces during the period of spring of 2007 to winter of 2008. Serological tests were performed using commercial ELISA kits. A total of 530 serum samples were tested for the antibodies against porcine reproductive and respiratory syndrome virus (PRRSV), porcine circovirus type 2 (PCV2), Mycoplasma hyopneumoniae (M. hyo) and Actinobacillus pleuropneumoniae (APP). Seroprevalence for four respiratory pathogens were estimated by ELISA-positive rates of the submitted samples. The overall seropositive rates of PRRSV, APP, M. hyo and PCV2 were 32.6%, 10.6%, 38.4% and 88.5%, respectively. By production stage, the seropositive rate for PRRSV was highest in nursery pig populations (46.2%). In contrast, the highest seropositive rates of APP and M. hyo were observed in sow and growing pigs. However, the seroprevalence of PCV2 was ranged from 85.7% to 89.6%, showing no significant difference among the production stages. In the seroprevalence by season, PRRSV, APP and M. hyo infections revealed typical seasonal patterns that the peaks of the seropositive rates were observed between early winter and late spring. In case of PCV2, no particular seasonal patterns were noticed. The pig herds in Gyeongbuk province where PMWS was endemic during the period of survey showed the highest seropositive rates for PRRSV (44.6%), M. hyo (47.5%), and PCV2 (92.7%). Seropositive rates for APP of four provinces were approximately 10%. These results might be valuable for control and prevention of the respiratory diseases and helpful to define strategies related to vaccine applications.
Detection and genetic characterization of Lawsonia intracellularis from swine in Korea
( Jia Qi Chu ),( Xu Min Hu ),( Myung Cheol Kim ),( Chang Sik Park ),( Moo Hyung Jun ) 한국가축위생학회 2010 韓國家畜衛生學會誌 Vol.33 No.3
A total of 191 samples collected from the commercial swine farms located in Chungnam province were investigated by PCR to estimate the prevalence of Lawsonia (L.) intracellularis infection. In the group of the pigs with proliferative enteritis, 14 (93.3%) of 15 intestinal samples and 12 (80.0%) of 15 feces were positive in PCR. In contrast, a relatively low positive rate (18.0%, 29 of 161 samples) was determined in the group of normal healthy pigs. The group of pigs over 120 days showed the highest positive rates (26.8%, 15 of 56 samples). In the comparison of the sequences of 210bp for species specific fragments and 301bp for outer membrane protein, the isolates (L1. L2) showed almost 100% identity with the reference L. intracellularis (L08049, USA). For the sequences of partial 16s rDNA, the homologies among the 5 isolates (L1-L5) were 97.4% to 99.3%, and those of 5 sequences (L1-L5) versus 5 overseas reference strains of L. intracellularis ranged from 98.6% to 99.8%. In the comparison of the nucleotide sequences among 5 isolates and other species in Desulfovibrionales showed 82.4 to 99.5% identities. The 5 isolates shared relatively low identities (76.9% to 84.4%) with the species of alpha-proteobacteria. In phylogenetic analysis based on the 16s rDNA sequences, all of the 5 isolates (L1-L5) were located in the same branch with the strains of L. intracellularis that were previously isolated from the pigs in USA and China. Seven strains of Desulfovibrio sp. were clustered in the neighboring branches, whereas alpha and gamma Proteobacteria showed distant relationship with L. intracellularis strains. The present findings suggest that L. intracellularis infection is endemic in the swine farms in the regions, and that the domestic isolates maintained very limited genetic variation.
Electronic and optical properties of graphane, silicane, MoS2 homo-bilayers and hetero-bilayers
Jia-Qi Hu,Lin-Han Xu,Shun-Qing Wu,Zi-Zhong Zhu 한국물리학회 2019 Current Applied Physics Vol.19 No.11
The electronic and optical properties of graphane, silicane and MoS2 bilayers, as well as the graphane/MoS2 and silicane/MoS2 hetero-bilayers, are calculated by the first-principles method. The interlayer interactions of all the bilayer systems are shown to be mainly van der Waals. Both the graphane/MoS2 and silicane/MoS2 heterobilayers belong to the type-II heterostructure, which can be utilized in photo-voltaic devices due to the efficient spatial separation of electrons and holes. For optical properties, the distinctions for the imaginary parts of the dielectric function 2 ( ) between the monolayer and bilayer systems for both the graphane and silicane are more evident in electric vector E||z. However, the differences between 2 ( ) of the monolayer and bilayer MoS2 materials are more significant in E||x. Broader light absorption ranges of the hetero-bilayers are reached, which can also improve the charge separation of the electron-hole pairs.