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The Effects of Interlocutor Variable on the Interlanguage Performance Variation
이혜문 한국응용언어학회 2005 응용 언어학 Vol.21 No.2
Studies on interaction have reported that the adult ESL/EFL learners prefer a native speaker over another learner as their interaction partner because of the low quality input provided by the nonnative speaker in terms of accuracy in particular. On the other hand, regarding the interactional features, studies suggest that NNS interlocutors provide more meaning negotiation and more opportunities for modified output than NS interlocutors. Although such interactional features are assumed to be beneficial to SLA in the interaction theory, their benefits have rarely been directly examined yet. As a way of examining the interlocutor effect more directly, it was examined whether and how learners' interlanguage performance differs depending on the interlocutor type, NS and NNS. Nine adult learners' overall interlanguage performance with a NS and a NNS interlocutor was compared in terms of complexity, accuracy and fluency, which have been theoretically proposed as playing the different roles for SLA, respectively, by Skehan (1998). The results show that the learners produced syntactically more complex (p<.05) but less accurate (p=.05) interlanguage to the NNS interlocutors than to NS interlocutors whereas fluency was not affected by the interlocutor type. It is concluded that NNS interlocutors are as valuable as NS interlocutors and it is suggested that since the benefits the NS and NNS interlocutor provide are different, the balanced opportunities to interact with the two types of interlocutors would be necessary.
이혜문,김경태,양상선,유지훈,김용진 한국입자에어로졸학회 2013 Particle and Aerosol Research Vol.9 No.3
Oxidations of metal generate large quantity of thermal and light energies but no toxic pollutants, so that metals with high calorific values, such as beryllium, boron, aluminum, magnesium, and lithium, are possible to be used as clean fuels instead of fossil fuels. However, they are so explosive due to very high oxidation rates that they should be stabilized by their surface passivation with oxides, organics and inorganics. For reasonable use of energetic metal particles as solid fuel, therefore, some detail information, such as thermal properties, preparation and passivation methods, and application area, of the energetic metals is introduced in this manuscript.
The Effects of Task Complexity for Text Summarization by Korean Adult EFL Learners
이혜문,박희수 한국영어영문학회 2011 영어 영문학 Vol.57 No.6
The present study examined the effect of two variables of task complexity,reasoning demand and time pressure, each from the resourcedirecting and resource-dispersing dimension in Robinson’s (2001) framework of task classification. Reasoning demand was operationalized as the two types of texts to read and summarize, expository and argumentative. Time pressure was operationalized as the two modes of performance,oral and written. Six university students summarized the two types of text orally and twenty four students from the same school summarized them in the written form. Results from t test and ANCOVA showed that in the oral mode, reasoning demand tends to heighten the complexity of the language used in the summary in competition with accuracy but such an effect disappeared in the written mode. It was interpreted that the degree of time pressure is not the only difference between the oral and written modes but that the two modes may be fundamentally different cognitive tasks, and that Robinson’s (2001) and Skehan’s (1998) models were differentially supported by the oral mode of tasks but not by the written mode of the tasks.
The Effects of Repeated Oral Summarization on the Learners’ IL Performance and Summary Quality
이혜문,박희수,Yoon, Yousook 한국응용언어학회 2007 응용 언어학 Vol.23 No.2
The present study examined the effect of repeated oral summary of written texts on the three aspects of interlanguage performance and the summary quality. Six university students summarized the two types of text, argumentative and expository, to three different hearers in dyads repeatedly. The argumentative text was assumed to be cognitively more demanding in its content with more causal reasoning than the expository text and so was expected to elicit more complex language along with more accurate language, according to Robinson’s (2007) cognition hypothesis. On the other hand, task repetition was hypothesized to improve complexity, accuracy and fluency of interlanguage performance by reducing the cognitive load for message generation in particular. Findings are (1) argumentative text resulted in more complex IL but expository text resulted in more accurate IL, without difference in fluency, (2) task repetition resulted in higher fluency in both texts, and (3) summary quality did not change by text type or repetition. Results partly support Robinson (2007) and partly support Skehan (1998, 2007). Simultaneous development of three aspects of IL seems improbable through the present study.
이혜문,김우현,이정규,Lee, Hye-Mun,Kim, U-Hyeon,Lee, Jeong-Gyu 한국기계연구원 2001 硏究論文集 Vol.31 No.-
These days, interest in the leaching of hazardous heavy metals to consist of incinerator fly ash is increasing, because the heavy metals that leach from the incinerator fly ash pollute the soil and ground water. Therefore this study was undertaken to crystallize the fly ash and prevent the leaching of hazardous heavy metals from fly ash. The concentrations and the leaching concentration of hazardous heavy metals(Cd, Cr, Hg, Pb, Zn) in the law incinerator fly ash have been measured. The fly ash was melted with two kinds of flux($Na_2CO_3, CaCO_3$) and its add quantity(0, 1, 2, 3 wt%). The crystal structure of melting materials was analyzed by SEM(Scaning Electron Microscope) and X-RD(X-Ray Diffractometer). The leaching test of melting materials was undertaken. And the relation between crystallization of melting materials and flux and leaching concentration. These experiments indicate that the concentration and leaching concentration of heavy metals in incinerator fly ash was much higher than the regulatory standard for leachates in Korea and U.S.A and average concentration of heavy metals in soil. And the crystal structure was better.