Analysis of Convergence-Education Program Research Trends in China Suggestions centered on a comparison with Korea

유자의(LIU ZIYI),최인수(Choe, Insoo),권해연(Quan, Haiyan) 한국비교교육학회 2021 比較敎育硏究 Vol.31 No.2

[연구목적] 본 연구는 한국과의 비교를 중심으로 지금까지 중국에서 연구된 융합교육 프로그램의 동향을 분석하여 앞으로의 연구에 대한 시사점을 도출하기 위해 진행되었다. [연구방법] 이를 위하여 SCI, EI, Peking University Core, CSSCI와 CSCD 등재지에 게재된 36편의 중국논문과 KCI에 등재된 181편의 한국논문이 분석에 사용되었다. 자료분석을 위해 코워드분석법과 내용분석법이 실시되었다. [연구결과] 첫째, 양국 모두 연구초기에 발행된 논문수가 증가되다가 3-4년 뒤 적어지는 추세를 보였다. 둘째, 제1저자는 한국논문은 대부분이 교수였고, 중국논문은 대부분이 중, 고등교사였다. 셋째, 한국의 논문은 대부분이 프로그램 효과검증을 마쳤고, 중국의 논문은 대부분 개발단계에 그쳤다. 넷째, 양국은 모두 자연과학영역에 집중된 논문이 대부분이었다. 다섯째, 한국의 논문은 프로그램 대상자가 다양한 연령층에 분포되었고, 중국의 논문은 고등학생에 집중되었다. 여섯째, 한국의 논문은 한국창의재단의 개발 틀을 기반으로 연구된 것이 대부분이었고, 중국의 논문은 연구자에 따라 다르게 나타났다. 일곱째, 연구방법에 있어 한국의 논문은 대부분 혼합연구방법을 사용하였고, 중국의 논문은 질적 연구가 대부분이었다. 여덟째, 프로그램의 교육목적의 경우, 한국의 논문은 학생의 가치관, 생활태도 및 여러 가지 소양의 양성을 포함한 다양한 영역에 분포되었고, 중국의 논문은 주요하게 학과지식의 교육에 집중되었다. 마지막으로 양국 모두 자국문화를 바탕으로 ‘A’의 요소를 강화한 프로그램 개발이 필요하다. [결론] 본 연구는 한중 양국의 융합프로그램 개발연구의 비교결과를 바탕으로 차이를 분석하고 그 원인을 탐색함으로서 향후 양국의 융합프로그램 개발 협력과 보완에 필요한 이론적 근거를 제시하였다. Purpose: The purpose of this study was to analyze recent trends of program research in convergence-education in China and compare the differences between the relevant research conducted in China and Korea in order to provide some references for future research. Methods: 36 Chinese papers were obtained by searching journals indexed by SCI, EI, Peking University Core, CSSCI, and CSCD and 181 Korean papers were obtained in the KCI index. Co-word analysis and content analysis were used. Results: First, the number of papers published in both countries increased at the beginning of the study and then decreased after 3-4 years. Second, the first authors were mostly professors in Korean papers, and mostly middle and high school teachers in Chinese papers. Third, most of the papers in Korea have been verified for the effectiveness of the program, and most of the programs in China are in the development stage. Fourth, most of the papers in both countries were focused on the natural science field. Fifth, Korean papers were distributed to various age groups, and Chinese papers were concentrated on high school students. Sixth, most of the papers in Korea were researched based on the development framework of the Korea Creative Foundation, and the papers in China were different depending on the researchers. Seventh, most Korean papers used mixed research methods, and most Chinese papers were qualitative. Eighth, considering the educational purpose of the program, Korean thesis was distributed in various areas including the cultivation of student values, life attitudes, and various literacy, and the Chinese thesis mainly focused on the aquisition of knowledge. Conclusion: This study analyzes the reasons for the differences between the development of convergence-education programs in China and Korea, and provides the necessary theoretical basis for the future development of cooperation between China and Korea.

DHA-enriched phosphatidylcholine suppressed angiogenesis by activating PPARγ and modulating the VEGFR2/Ras/ERK pathway in human umbilical vein endothelial cells

Yuanyuan Liu,Yingying Tian,Yao Guo,Ziyi Yan,Changhu Xue,Jingfeng Wang 한국식품과학회 2021 Food Science and Biotechnology Vol.30 No.12

Docosahexaenoic acid-enriched phosphatidylcholine(DHA-PC) is a new generation of omega-3 lipids,which contains an ester bond linking DHA at the sn-2position of phospholipid. DHA-PC has become the interestrecently as its better bioavailability and anti-oxidationcapacity. In this study, the anti-angiogenic effect of DHAPCwas evaluated. The capacities of proliferation, migration,tube formation of human umbilical vein endothelialcells were significantly declined after DHA-PC treatment. Furthermore, DHA-PC inhibited the neovascularization ofthe chick chorioallantoic membrane in vivo. Mechanismresults indicated that DHA-PC enhances the expression ofperoxisome proliferator-activated receptor c (PPARc) attranscriptional and translational level, subsequently downregulatesthe VEGFR2 expression and VEGFR2-mediateddownstream Ras/ERK pathway, resulting in significantreduction in proliferation and differentiation. Additionally,PPARc-specific antagonist GW9662 partly reversed theinhibition effects of DHA-PC on tube formation and neovascularization,suggesting that DHA-PC exerts anti-angiogenesiseffect through activating PPARc. Thesefindings indicated that DHA-PC has a great prospect ofanti-tumor angiogenesis therapy.

A Study on Autonomous Intersection Management: Planning-Based Strategy Improved by Convolutional Neural Network

Jian Zhang,Xia Jiang,Ziyi Liu,Liang Zheng,Bin Ran 대한토목학회 2021 KSCE Journal of Civil Engineering Vol.25 No.10

The development and application of autonomous vehicles bring great changes to urban traffic management and control. As one of the bottlenecks to improve transportation efficiency, intersection management plays an important role in the urban city. When the dynamic control method in different cases is determined, the key of autonomous intersection management problem is to search the passing orders for approaching connected and automated vehicles (CAVs). The paper proposed a framework based on convolutional neural network to predict different passing orders’ total time consumption. Thus, the best passing order with the lowest time consume can be chosen as the optimal solution. Then continuous-time optimal control can be carried out on CAVs. Meanwhile, sequential model-based algorithm configuration technique is used for neural network training. Simulation results exported from Simulation of Urban Mobility (SUMO) indicate that the proposed method outperforms actuated signal control and first come first serve strategy. The average delay of the proposed method can decrease by 42.40% − 73.05% compared with actuated signal control and 2.95% − 55.29% compared to first come first serve strategy. Moreover, it can increase average speed by more than 20% compared with the other two methods. The proposed method can significantly reduce the computation time comparing with the original planning-based strategy. At last, the framework can be applied to other regression tasks like vehicle emissions, then different optimization targets can be estimated to get better solutions faster.

Random vibration fatigue life assessment and optimization of a train buffer beam considering welding residual stress

Chengji Mi,Jidong Liu,Xuewen Xiao,Wentai Li,Xiao Sun,Xingzu Ming,Changyan Tao,Ziyi Ren 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.3

The traditional fatigue design of accessories attached to a train body does not consider welding residual stress for fatigue life prediction of welded structures during the design stage, thereby resulting in insufficient fatigue strength for local welded parts. The power spectral density of random excitation caused by rail irregularity from American six-level spectrums was obtained in this paper. Through welding thermal elastoplastic theory combined with ellipsoid heat source model, a numerical simulation for welding residual stress production and distribution of a train buffer beam was conducted. In accordance with the coupling stress component, the fatigue performance of a train buffer beam under random loads was evaluated by the AA6082 welded joint S–N curve, whose lifetime did not satisfy design requirements. Then, the surrogate model of a train buffer beam for anti-fatigue optimization design was constructed based on the response surface method. The fatigue life of the optimized train buffer beam increased by two orders with the use of the genetic algorithm to find the optimal solution in global variables.

V-promoted Ni/Al2O3 catalyst for synthetic natural gas (SNG) production: Catalyst preparation methodologies

Fabing Su,Qing Liu,Fangna Gu,Ziyi Zhong,Guangwen Xu 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.5

The effect of preparation method on the catalytic performance of V-promoted Ni/Al2O3 catalysts for synthetic natural gas (SNG) production via CO methanation has been investigated. The Ni-V/Al2O3 catalysts were prepared by co-impregnation (CI) method, deposition precipitation (DP) method as well as two sequential impregnation (SI) methods with different impregnation sequence. Among the prepared catalysts, the one prepared by CI method exhibited the best catalytic performance due to its largest H2 uptake and highest metallic Ni dispersion. In a 91h-lifetime test, this catalyst showed high stability at high temperature and weight hourly space velocity. This work demonstrates that the catalytic performance of the V-promoted Ni/Al2O3 catalysts can be improved by carefully controlling the preparation method/conditions.

Effect of enzymolytic soybean meal supplementation on performance, nitrogen excretion, serum biochemical parameters and intestinal morphology in broilers fed low-protein diets

Zhu Xin,Gao Kai,Zhang Ziyi,Liu Haiying,Yang Guiqin 아세아·태평양축산학회 2023 Animal Bioscience Vol.36 No.11

Objective: The objective of this study was to investigate the effect of supplementation with enzymolytic soybean meal (ESBM) on broilers fed low crude protein (CP) diets. Methods: A total of 360 one-day-old broilers were randomly assigned to six treatments with 6 replicates per treatment and 10 chicks per replicate for a period of 42 days. Chicks were fed a basal standard high-CP diet as a positive control (PC), a low-CP diet (reducing 10 g/kg CP from the PC) as a negative control (NC), or an NC + 0.5%, 1.0%, 1.5%, or 2.0% ESBM diet. Results: Compared to chicks fed the PC, chicks fed the NC had a decreased body weight gain (BWG, p<0.05) from 1 to 42 days, but supplementation with 2.0% ESBM restored BWG (p<0.05) and even linearly improved the feed conversion rate (FCR, p<0.05). Digestibility of CP and ether extract was increased (p<0.05) in chicks fed a 1.0% ESBM diet compared to the PC. With increasing levels of ESBM, nitrogen (N) excretion decreased (p<0.05). The addition of ESBM to the diet did not affect (p>0.05) serum concentrations of total protein, albumin and total cholesterol but led to a descending trend in triglycerides and an ascending trend in calcium and urea N at 42 days (p<0.10). There were no differences (p>0.05) in villus height (VH), crypt depth (CD), and VH/CD (V/C) of the duodenum and jejunum between the PC and NC at both 21 days and 42 days, while increasing dietary ESBM levels linearly (p<0.05) decreased CD and increased V/C of the duodenum and jejunum at both 21 days and 42 days. Conclusion: The findings indicated that ESBM could be used in broiler low-CP diets to improve production performance, decrease N excretion, and enhance intestinal health.

Role of microRNAs in myogenesis and their effects on meat quality in pig — A review

Iqbal Ambreen,Ping Jiang,Ali Shaokat,Zhen Gao,Juan Liu,Kang Jin Zi,Ziyi Pan,Huixian Lu,Zhihui Zhao 아세아·태평양축산학회 2020 Animal Bioscience Vol.33 No.12

The demand for food is increasing day by day because of the increasing global population. Therefore, meat, the easiest and largely available source of protein, needs to be produced in large amounts with good quality. The pork industry is a significant shareholder in fulfilling the global meat demands. Notably, myogenesis- development of muscles during embryogenesis- is a complex mechanism which culminates in meat production. But the molecular mechanisms which govern the myogenesis are less known. The involvement of miRNAs in myogenesis and meat quality, which depends on factors such as myofiber composition and intramuscular fat contents which determine the meat color, flavor, juiciness, and water holding capacity, are being extrapolated to increase both the quantity and quality of pork. Various kinds of microRNAs (miRNAs), miR-1, miR-21, miR22, miR-27, miR-34, miR-127, miR-133, miR-143, miR-155, miR-199, miR-206, miR-208, miR-378, and miR-432 play important roles in pig skeletal muscle development. Further, the quality of meat also depends upon myofiber which is developed through the expression of different kinds of miRNAs at different stages. This review will focus on the mechanism of myogenesis, the role of miRNAs in myogenesis, and meat quality with a focus on the pig.