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RISS 인기검색어
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- 저자 : Mengmeng Jia (검색결과 3 건)
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초점 억양에 대한 한국인 모어 화자와 중국인 학습자의 지각 범주화 양상 연구
가맹맹 ( Jia Mengmeng ) 중국한국(조선)어교육연구학회 2023 한국(조선)어교육연구 Vol.22 No.0
The purpose of this study is to reveal Korean native speakers and Chinese learners’ categorical perception of the intonational cues of focus. In order to do that, 19 Korean native speakers and 57 Chinese learners participated in the discrimination experiment and identification experiment. The results show that first, there are differences between Korean native speakers and Chinese learners with different proficiency in categorical perception of the intonational cues of focus, which means in terms of the pronunciation which Korean native speakers would not hear as focus, Chinese learners could hear as focus, and the possibility of that is getting higher as the proficiency of learners getting lower. Second, as the perception training should focus on the formation of categorical perception, training perception by natural pronunciation of Korean native speakers is not appropriate. Instead, the stimuli of the boundary of category should be used.
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The Use of GA and PSO in Evaluating the Shear Strength of Steel Fiber Reinforced Concrete Beams
Jiandong Huang,Mengmeng Zhou,Jia Zhang,Jiaolong Ren,Nikolai Ivanovich Vatin,Mohanad Muayad Sabri Sabri 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.9
Shear failure in concrete specimens and beams is one of the most sensitive cases in construction projects. Since the shear strength of specimens is affected by various parameters, it is important to study them to arrive at a predictive relationship or model. This research has used the computational methods of machine learning to achieve a new evaluation of the shear strength of reinforced concrete (RC) beams. In the first step, 85 laboratory samples were examined. These samples had different geometric and non-geometric properties. The effect of each parameter was examined for smart models, then the optimal state of the parameters was determined. By optimizing the number of parameters, basic models were developed. The different structures of these models were investigated for the accurate evaluation of the shear strength of the samples. Finally, in the second step, the particle swarm optimization (PSO) and genetic algorithm (GA) were used to perpetuate and optimize the weights of the base models. The hybrid models were developed and applied with different structures for evaluation of shear strength and the best models were selected from them. The results showed that both models offer better performance than the base model. However, the GA-based model achieved higher accuracy and less error than the PSO-based model. Finally, the performance of these models was used for new data to evaluate their performance. As the main achievement of this research, these methods can be recommended and implemented for other conditions as well.
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Shuifan Zhou,Zhenqing Hou,Yang Li,Fei Cui,Mengmeng Jia,Xiangrui Yang,Yange Wang,Liya Xie,Qiqing Zhang 한국고분자학회 2014 Macromolecular Research Vol.22 No.1
The efficacy of magnetic nanoparticles (MNPs) for biomedical applications depends on the specic targetingcapacity, blood circulation time and magnetic susceptibility. Functionalized chitosan-coated Fe3O4 nanoparticles(CS-coated Fe3O4 NPs) were synthesized by a non-solvent-aided coacervation procedure followed by a chemicalcrosslinking procedure. The surfaces of CS-coated Fe3O4 NPs were successfully functionalized with folate-poly(ethyleneglycol)-COOH (FA-PEG) to obtain novel FA-PEG-CS-coated Fe3O4 NPs endowed with long blood circulationand specic targeting capacity. The as-synthesized NPs were characterized by dynamic light scattering, transmissionelectron microscope, X-ray diffraction, thermal gravimetric analysis, vibration sample magnetometer, Fourier transforminfrared spectroscopy, and confocal laser scanning microscopy. As a result, the novel FA-PEG-CS-coated Fe3O4 NPsshowed excellent biocompatibility, magnetic properties, good dispersibility, and proper hydrodynamic sizes in an aqueousmedium. The specific targeting capacity of the as-synthesized NPs to cancer cells was also investigated. It wasobserved that the uptake of the FA-PEG-CS-coated Fe3O4 NPs by HeLa cells was significantly enhanced comparedto the CS-coated Fe3O4 NPs and mPEG-CS-coated Fe3O4 NPs. These results clearly indicate that our novel FA-PEGCS-coated Fe3O4 NPs with remarkable specific targeting capacity, long blood circulation, and superparamagnetismhold great promise for biomedical applications, including targeted drug delivery and hyperthermia therapy.
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