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RISS 인기검색어
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- 저자 : Nuan Liu (검색결과 3 건)
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Nuan Liu,Xiumin Liu,Soondo Baek 이화여자대학교 사범대학 교과교육연구소 2022 교과교육학연구 Vol.26 No.6
The acquisition of appropriate combinations of delexical verbs and their object nouns (e.g., make a mistake vs. *do/have a mistake) is known to be difficult for L2 learners of English largely due to arbitrariness in association between the verbs and the object nouns. The researchers aimed to deepen our understanding of the nature of this learning difficulty by analyzing Korean and Chinese learners written corpora in regard to the frequency and error patterns of delexical verb + noun collocations for the six typical light verbs (do, get, give, have, make, and take). A native written corpus was used to establish the target norm for the use of the target constructions. The overall results show that both Chinese and Korean EFL learners, as compared with English L1 writers, used a limited number of target constructions repeatedly, revealing a lack of collocational knowledge as to delexical verbs. More specific analyses on individual verbs present both similarities and differences across the individual verbs and the three groups of writers, suggesting that the degree of difficulty in acquiring delexical verb + noun collocations could be modulated by the frequency with which they appear in the input and how their meanings are lexically represented in the learners’ L1.
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L1-Korean L2-English Speakers’ Performance of Refusal Speech Acts in EFL and ELF contexts
Xiumin Liu,Nuan Liu,백순도 한국응용언어학회 2022 응용 언어학 Vol.38 No.4
Refusal speech acts have received much attention in the L2 pragmatics literature due to their complexity and learning difficulty. However, most of previous research studies were conducted with English-learning students with focus on situations in which English was used as a foreign language (EFL) in interaction with a native speaker of English, making it difficult to generalize their findings to professionals using English as a lingua franca (ELF) in interaction with non-native speakers of English. To address this research gap, the present study investigated refusal speech acts performed in EFL and ELF contexts by participants whose working language was English. Data were obtained using the Discourse Completion Task. Thirty-four L1-Korean L2-English speakers' response in English in both EFL and ELF contexts provided L2 data, while 36 L1-Korean and 35 L1-English speakers' response in their native languages provided L1-baseline data. L1-Korean L2-English speakers showed both L1 transfer and target-like performance in terms of frequencies of different refusal strategies and content of expressions used to perform refusal strategies, with L1 transfer effects being clearer in content of expressions. Possible reasons for the complex pattern of L1 transfer and potential roles of characteristics of participants and contexts were discussed.
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Le Liu,Nuan Shao,Suyan Ding,Yi-ming Fang 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.5
This paper investigates the decoupling and coordinated tracking control problem for the speed and tension system of the reversible cold strip rolling mill. Using a diagonal matrix decoupling network and neural network disturbance observers, we propose a command filter-based backstepping control strategy. First, the diagonal matrix decoupling network is constructed to weaken the coupling between the speed and tension of the rolling mill system, which reduces the complexity of the system model effectively. Second, controllers are designed by combining the backstepping with the command filter, which solves the “explosion of complexity” problem in backstepping procedure, and optimizes the system’s control structure. Next, neural network disturbance observers are developed to observe the uncertain items of the system, which improve the tracking control precision of the system effectively. Theoretical analysis shows that all signals in the closed-loop system are uniformly ultimately bounded. Finally, simulation research is carried out on the speed and tension system of a 1422 mm reversible cold strip rolling mill; results show that using the proposed control strategy increased the dynamic response speed of the system by approximately 1s, and the stability precision improved by approximately 2000 N.
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