Effects of Media Integration on Users’ Parasocial Relationship and Political Participation in China

Zilin Du,Jong Hyuk Lee 한국콘텐츠학회 2022 International Journal of Contents Vol.18 No.2

This study explored the effects of the parasocial relationship formed by CCTV (China Central Television) TV news and non-traditional news on users perceived media credibility and their online and offline political participation. This study conducted a survey with the Chinese CCTV users between April 19 and April 30, 2021, and finally, 701 respondents’ data were analyzed using structural equation modeling. The study results showed that both TV news and non-traditional news had positive effects on parasocial relationships and the parasocial relationship positively influenced media credibility, which subsequently facilitated political participation. However, there was no direct effect between media usage and media credibility. This implies the important mediating role of parasocial interactions, which enables CCTV news to gain media credibility and subsequently influence political participation. This study suggests that CCTV needs to improve the parasocial interactions between their audience and media figures by utilizing the interactive mechanism of non-traditional media.

Chinese Students’ Identity Construction and Negotiation during Emergency Remote Teaching: A Case Study from Wuhan

Zilin Wang,Lucas Kohnke,Di Zou 아시아테플 2022 The Journal of Asia TEFL Vol.19 No.3

PATH FOLLOWING AND LATERAL-YAW-ROLL STABILITY INTEGRATED CONTROL METHOD FOR AUTONOMOUS DISTRIBUTED DRIVE ELECTRIC BUSES

Xin Zilin,Wang Wenwei,Liang Sheng 한국자동차공학회 2023 International journal of automotive technology Vol.24 No.4

In order to improve the path following performance and solve the stability problems of autonomous distributed drive electric buses, this paper proposed a path following and lateral-yaw-roll stability integrated control method. Firstly, to cope with the varying speed during different maneuvers and roll motion of autonomous distributed drive electric buses, a nonlinear 4-DOF vehicle dynamic model which includes rolling and longitudinal movement is established. Secondly, a hierarchical control method is built, in the upper layer, a model predictive controller (MPC) is designed to generate the control inputs, which is obtained through an optimization problem including path following error and vehicle stability condition, especially the roll stability for buses, and for the lower layer, the torque of each drive wheel is distributed through solving an optimization problem about drive requirement and tire utilization. Finally, the validation of the proposed method is carried out through TruckSim-Simulink co-simulation, the results illustrate that both following accuracy and vehicle stability are obtained more effectively than the popular linear MPC method, especially roll stability is guaranteed under extreme condition.

교수언어로서의 학습자 모어 사용 기능 연구 - 중국인 초급 학습자 대상 한국어 문법 수업을 중심으로 -

유자림 ( Liu Zilin ) 서울대학교 국어교육과 2024 先淸語文 Vol.53 No.-

The purpose of this study is to clarify the function of learner's L1 use as a teaching language in Korean beginner grammar class and to discuss the use of learner's L1. A discourse analysis was conducted on beginner Korean grammar classes targeting co-lingual learners, and the use of the L1 of four teachers was analyzed to reveal the specific function of the use of the L1. Then, by synthesizing the content of the discourse analysis with the perception survey of teachers and learners, the use of the learner's L1 as a teaching language in the beginner grammar class was proposed, specifying the existing discussion on the use of the L1 as a teaching language. Existing studies have presented a comprehensive conclusion that the use of the target language is important, but that learners' L1, when used appropriately, is helpful in learning a foreign language. Currently, further discussions are needed on how to properly use the mother language under what conditions, which this study focuses on. Unlike Korean language classes in Korea that claim to be target language-centered, those in China are characterized by active use of their L1 as a teaching language. This is an educational environment that can provide meaningful educational implications for the use of L1. Therefore, this study set the research topic of using L1 as a teaching language in beginner Korean grammar classes in China. In the discourse analysis stage, through class discourse analysis and frequency analysis based on AS-unit, the function of learner's mother language use in beginner grammar class was classified into information provision function, activity organization and implementation function, emotional communication function, and 10 sub-detailed functions. The four teachers used the information provision function with functions such as presenting grammatical meaning through metalanguage, presenting the context of use of grammar and vocabulary, presenting linguistic and cultural knowledge, translating vocabulary and example sentences, and providing corrective feedback. In addition, activity organization and implementation functions were used as functions such as directing and progressing class activities, questioning, answering, and inducing learners' output. Emotional communication functions were used as functions of reducing learners' anxiety, promoting and motivating learning, and revitalizing the class atmosphere. Teachers actively used their L1 in various functions because of the limited Korean ability of beginner learners and the efficiency of using their L1 in teaching and learning situations targeting co-lingual learners. Then, through interviews conducted with teachers and learners, the recognition of teachers and learners participating in the class was confirmed as follows. Teachers and learners commonly recognized that the use of L1 is necessary in elementary grammar classes, and the reason is mainly for efficient teaching through the help of L1 when understanding grammar and vocabulary, and emotional support such as interest in learning. In addition, teachers and learners commonly recognized that the L1 functions for explaining grammar and vocabulary, running classes and conducting activities. However, unlike teachers, there was a difference in that learners recognized the emotional communication function as a major function of using L1. In addition, both teachers and learners answered that the use of the L1 should be restricted as the level of learning increases, and that it is necessary to use the target language repeatedly instead of the L1 for the contents already learned. Finally, by synthesizing the discourse analysis and interview results, the significance and limitations of using the L1 were clarified. Then, the situations in which the L1 would be appropriately used and the situation in which the L1 use would be limited were discussed. L1 is mainly used in the explanation of vocabulary and grammar of the target language and overall class operation. Since L1 is used at a high rate, it is necessary to use L1 in a planned manner according to the educational situation. This is why situations of whether to use L1 are discussed. In addition, it is also considered important in terms of use of L1 that more than teachers recognize, beginner learners valued the emotional communication function of their L1, which eases the burden of learning and promotes learning. In this way, this study identified the function of using L1 in beginner Korean grammar classes in China and discussed the use of learners' L1 in beginner grammar classes based on teacher and learner recognition. While previous studies have studied the function of L1 use by quantitatively comparing the amount of utterance, or by examining teachers and learners' perceptions of their L1 use through a questionnaire method, this study was conducted in a class of four different teachers and found out the function of using the L1 by comparing and analyzing the patterns of use of the L1 through discourse analysis of the class, and the teacher-learner's perception of the class was combined with the content of the discourse analysis to discuss the use of the L1. In particular, this study did not comprehensively deal with the use of the L1 in Korean language education, but discussed the function and use of the L1 under the specific conditions of a beginner Korean class targeting the co-lingual language learners, making an expanded discussion beyond the existing research. In addition, in various classes targeting learners of various levels, the learner's L1 is actively used, especially in overseas Korean classes. This study, which studied the function of using the L1 under the condition of a beginner grammar class in China where the need for the L1 is relatively high and the use of the L1 is prominent, provides meaningful educational implications for the overseas Korean language education field where the L1 is actively used. This study can provide meaningful information and grounds for exploring ways to teach Korean using learners’ L1.

Joint Deployment and Trajectory Optimization in UAV-Assisted Vehicular Edge Computing Networks

Zhiwei Wu,Zilin Yang,Chao Yang,Jixu Lin,Yi Liu,Xin Chen 한국통신학회 2022 Journal of communications and networks Vol.24 No.1

As the general mobile edge computing (MEC)scheme cannot adequately handle the emergency communicationrequirements in vehicular networks, unmanned aerial vehicle(UAV)-assisted vehicular edge computing networks (VECNs) areenvisioned as the reliable and cost-efficient paradigm for themobility and flexibility of UAVs. UAVs can perform as thetemporary base stations to provide edge services for road vehicleswith heavy traffic. However, it takes a long time and huge energyconsumption for the UAV to fly from the stay charging stationto the mission areas disorderly. In this paper, we design a predispatchUAV-assisted VECNs system to cope with the demandof vehicles in multiple traffic jams. We propose an optimalUAV flight trajectory algorithm based on the traffic situationawareness. The cloud computing center (CCC) server predictsthe real-time traffic conditions, and assigns UAVs to differentmission areas periodically. Then, a flight trajectory optimizationproblem is formulated to minimize the cost of UAVs, while boththe UAV flying and turning energy costs are mainly considered. Inaddition, we propose a deep reinforcement learning(DRL)-basedenergy efficiency autonomous deployment strategy, to obtain theoptimal hovering position of UAV at each assigned mission area. Simulation results demonstrate that our proposed method canobtain an optimal flight path and deployment of UAV with lowerenergy consumption.

A study on tracking error based on mechatronics model of a 5-DOF hybrid spray-painting robot

Jun Wu,Zilin Liu,Guang Yu,Yuyao Song 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.9

Industrial robots suffer from difficulties in predicting and guaranteeing tracking performance due to the complex dynamic behavior and inaccurate mechatronics model. This study investigates the tracking error and motion accuracy improvement based on a mechatronics model of a 5-degree of freedom hybrid spray-painting robot. The dynamic model of the robot is derived by using Lagrange equation, and an identification method is presented to identify the torque coefficient and joint friction synchronously. An accurate mechatronics model is established after the theoretical dynamic modeling and friction identification. The tracking error generation mechanism of the robot control system is studied, and its analytical equation is derived on the basis of a transfer function. A multichannel feedforward controller is synthesized to reduce the tracking error from different sources. The effectiveness of the proposed method in improving tracking accuracy is verified by physical experiments.

Size-fractionated Biomass and Productivity of Phytoplankton in Prydz Bay and the Adjacent Indian Sector of the Southern Ocean during the Austral Summer 1990/1991

Ning Xiuren,Zilin Liu,Junxian Shi,Genhai Zhu,Min Gong 한국해양과학기술원 1993 KOREAN JOURNAL of Polar Research Vol.4 No.2

A geometric error modeling method and trajectory optimization applied in laser welding system

Hao Tang,Zilin Zhang,Changping Li,고태조 한국정밀공학회 2019 International Journal of Precision Engineering and Vol.20 No.8

In this paper, a geometric error modeling method is carried out on six-axis motion platform (SMP) in laser welding system (LWS), and an optimized algorithm is proposed for the alignment in LWS based on the error model. First, the topological structure of the given SMP is analyzed, and related homogeneous transformation matrices which are used for standing the orientation of SMP are established. By these matrices, the geometric error model is developed mathematically. Then, the error model is used for predicting the alignment deviations. A corresponding series of experiments for calculating the optical power loss in alignment are employed, and the comparison between simulation and experiments results indicate the validation of the error model. Furthermore, an optimized algorithm is applied to search the optimum aligning trajectory. Compared to conventional method, this algorithm has a broader range in searching extreme value, which can reduce the computational volume and improve the efficiency. It is also beneficial for improving the success rate of escaping from the local minimum spot and finding the optimum alignment spot. The error model is helpful to analyze the error propagation process and improve the alignment efficiency in LWS, which can be applied to other similar multi-axis precise system.

A novel geometric error modeling optimization approach based on error sensitivity analysis for multi-axis precise motion system

Hao Tang,Changping Li,Zilin Zhang,고태조 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.7

In this paper, a novel error modeling approach for multi-DOF precise motion platform (MPMP) based on the error sensitivity analysis (ESA) is introduced. Sensitivity analysis (SA) is widely adopted for finding the essential parameters in system in mathematical way. This paper leads an error sensitivity analysis based on Monte Carlo thought into geometric error model. Through comparing the variance between the set of evaluated error and corresponding orientation deviations, a sensitive order with several sensitive levels can be developed. Conventional error modeling method only concentrates the systematic accuracy, while calculation efficiency is also important. Thus, this error modeling optimization approach based on sensitivity analysis is beneficial for the high-accuracy and high-quantity manufacture environments, which is more precise and effective. It also can save the computational volume for the calculation in error model. A case study of the new error modeling optimization procedure for six-axis stage in the alignment in optoelectronic packaging system (OPS) is carried out. The time-consumed results indicate that the optimized error model can not only keep high-accuracy requirement, but also improve the computational efficiency, which is informative and effective for MPMP motion control. For large number working situation, the optimized error model is available as well.

Numerator-Denominator Model Based H<SUB>∞</SUB> Robust Control for LCL Filter-Based Grid-Connected Inverters under Weak Grid Conditions

Bo Long,Chu Wang,ZiLin Zhu,Xin Lu,LiJun Huang,YuFei Dai,Yong Liao,FuSheng Li 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5

In the grid-connected inverter controller system, conventional PI or PR controller decrease their lowfrequency gain and bandwidth to maintain the stability of the system. However, this degrades the disturbance rejection and current tracking capability. To solve this problem, this paper gives an H∞ robust control scheme based on Numerator Denominator Model method, which has the advantages of simplified current controller design procedure, can place the poles of closed-loop system at the desired place. By properly selecting the weight function, the proposed control scheme can not only achieve good robustness in disturbance rejection capability, but also gives a straight forward to design the dynamic performance. Simulation and experimental comparison results between PR and H∞ controller is demonstrated. The results prove that the proposed control scheme shows obviously improvements on the robustness of inverter and meanwhile does not lose advantages on the dynamic performance.