• Journal of Korean Society of Occupational and Environmental Hygiene
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• v.4 no.1
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• pp.96-102
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• 1994

Factors affecting non-proficient analytical ability were compared and evaluated by rating of laboratories and round. Analyst Indices between proficient and non-proficient participants were different. Coefficients of determination($R^2$) for standard of toluene, xylene and trichloroethylene of the 4th round between some proficient and non-proficient participants were significantly different(p<0.05). But, there was no difference in the 5th round. Average desorption efficiency of non-proficient participants was 88%-98%, which was lower than 96%-100% of some randomly selected proficient participants. Also non-proficient participants have a large variance of desorption efficiency, 11.79-19.69%. In the 5th round, desorption efficiency of metyl iso-butyl ketone(MIBK) reported by all participants was lower than 90% tested by NIOSH and especially low compared to other analytes. Participants evaluated to be non-proficient in the metal part have 85%-100.84% of average recovery, which was larger variance than 98% of some proficient participants. Although it is difficult to find quantitatively factors causing non-proficiency in analytical ability, pretreatement techniques and experience of analyst seems to be more important factors to produce accurate analytical result.

• English Language & Literature Teaching
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• v.17 no.3
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• pp.1-25
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• 2011

This research primarily aimed to investigate proficient and less proficient EFL readers' awareness and experiences about learning to read and reading in English. The secondary purpose was to explore the participants' reading strategies, and to discover how the genres of English texts influence their reading processing behaviors. The participants consisted of four college students in engineering aged 21-25 years. Three data sources were employed: questionnaires, interviews, and think-alouds. The findings revealed that: (1) the proficient EFL readers judged themselves to be good readers, while the less proficient EFL readers judged themselves to be fair readers; (2) unknown vocabulary was perceived to be the major impediment to reading comprehension; the think-aloud data, however, demonstrated that unknown vocabulary did not significantly interfere with their reading comprehension; (3) regardless of the genre of the text, the participants employed similar reading strategies; (4) the participants were more likely to tolerate ambiguity and predict the content when reading the narrative text than the expository text; (5) there was no set of strategies that distinguished proficient EFL readers from less proficient EFL readers; and (6) when identifying problems, the proficient EFL readers used fix-up strategies more effectively and were better able to provide satisfactory solutions than their counterparts. Pedagogical implications for EFL reading instruction are discussed.

• Communications of Mathematical Education
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• v.26 no.1
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• pp.29-50
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• 2012

The purpose of this study is a comparison of proficient level and below basic level students' mathematical achievement in the National Achievement Evaluation and Assessment(NAEA). For the purpose, this study compared the proficient level and below basic level students' ratios, students' mathematical achievement of contents area and behavioral area in 6th, 9th, and 11th grades. This study found the change of proficient level and below basic level students' ratios, and the proficient level and below basic level students' characteristics on mathematical achievement of contents area and behavioral area in 6th, 9th, and 11th grades.

• Phonetics and Speech Sciences
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• v.3 no.3
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• pp.3-10
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• 2011

This study examined the production of aspirated stop consonants in Korean and English words to address how the influences differed particularly in terms of proficiency in L2 English. Voice onset times (VOTs) were measured from two American monolinguals and seven Korean speakers. The results showed that VOT patterns for both L1 and L2 stops differed according to their proficiency in L2 English. In L2 English, high proficient speakers produced VOTs that were similar to those of native speakers of English whereas low proficient speakers produced VOTs that were significantly longer than those of proficient speakers. In L1 Korean and L2 English, most of the proficient speakers produced VOTs similarly. Unlike previous findings, Korean VOTs were even shorter than English counterparts. The VOT shortening of aspirated stops in Korean was found for most of the proficient speakers. The findings of the present study suggest that cross language phonetic influences as well as the ongoing VOT shortening in Korean aspirated stops may be correlated with L2 proficiency. Since this is a pilot study with a small number of subjects for each proficiency group, further quantitative study is necessary to generalize.

• English Language & Literature Teaching
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• v.13 no.4
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• pp.1-32
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• 2007

This study took a cross-sectional, quantitative approach and profiled EFL students' awareness of the writing process and of teacher feedback. The subjects were 113 college students aged 19-26 years from non-English majors, who were enrolled in three sections of a required English course. According to the scores gained from the essay writing assignment, they were divided into two groups (proficient and less-proficient writers) and responded to an in-class survey. Major findings were that: (1) the vast majority of both groups did not find English writing enjoyable; (2) longer comments gave rise to substantial changes to the students' revisions; (3) the less-proficient writers were shown to benefit from revision significantly more than the proficient writers; (4) Both groups of writers utilized multiple strategies to process teacher feedback and preferred to receive teacher comments using complete sentences rather than phrases or single words; and (5) teacher's marks on grammar and vocabulary claimed to be most conducive to EFL writing development. Several important implications for EFL writing instruction and for future studies are suggested.

• English Language & Literature Teaching
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• v.17 no.3
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• pp.27-56
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• 2011

The analysis on the use of lexical discovery and consolidation strategies that have been researched within the area of vocabulary learning strategies (VLS) have not sufficiently drawn the interest of EFL practitioners with regard to vocational high school learners. The results, however, are expected to have implications for the design of vocabulary tasks and instructional materials for EFL learners. The present study investigates EFL vocational high school learners' use of lexical discovery and consolidation strategies with questionnaires, where the use of the learners' lexical discovery strategies were further validated with the think-aloud methodology by asking samples of proficient and less proficient learners to report on their reading process while reading L2 texts that had not been exposed to the learners. The results indicated that there were significant differences between the two groups of learners in the employment of 11 of the strategies which were in the categories of determination, social, memory, and metacognitive strategies, but not for cognitive strategies. The pattern of strategies indicated that different lexical discovery and consolidation strategies were employed relatively more by one proficiency group than another. The study suggests some implications for how strategy-based instruction can be implemented in EFL classrooms.

• The Mathematical Education
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• v.47 no.1
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• pp.11-25
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• 2008

The characteristics of the pseudo-conceptual or the pseudo-analytical behaviors according to the achievement level(i.e. advanced group, proficient group, basic group, and below-basic group) in grade 9 are as follows. The pseudo-conceptual or pseudo-analytical behaviors to get credit from teachers become conspicuous in lower achievement level. The high achieving students showed more pseudo-conceptual or pseudo-analytical behaviors without undergoing the process of reflection or control. The proficient group was short of control in computation, and the advanced group didn't control well in representation. The proficient group tended to depend on a past successful algorithm and behave habitually. Therefore, it is needed to teach mathematics according to the characteristic of pseudo-conceptual or pseudo-analytic behaviors shown in each achievement level.

• English Language & Literature Teaching
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• v.13 no.1
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• pp.1-26
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• 2007

This study aimed to investigate how EFL learners perceived English writing tasks and teachers' written feedback. The subjects were 82 mixed major college EFL students aged 19-24; the majority were freshmen females. Based on the scores estimated from the essay evaluation test, they were placed into two groups (proficienand less-proficient writers) and responded to an in-class questionnaire. The results indicated that: (1) regardless of writing proficiency, a large number of the students felt that they were just fair writers, which could be derived from low confidence and high anxiety; (2) grammar and vocabulary were perceived as the main features that determined good EFL writers and also prevented the students from performing the writing task successfully; (3) they believed that teachers' feedback contributed to the development of their English writing skills because it helped them apprehend what to improve or avoid in the future, acquire better English usage, and correct their errors; and (4) the proficient writers were more willing to correct errors themselves after being provided clues than the less-proficient writers. Implications of the findings for EFL classrooms are discussed.

• English Language & Literature Teaching
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• v.12 no.3
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• pp.25-49
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• 2006

Though a large amount of research concerning listening strategies has been conducted, the strategic behaviors of younger students in this area have received less attention. This study is a follow up study of an earlier case study by the author (2006). The purpose of this study is to verify what listening strategies Korean elementary learners use in a general L2 listening situation. 213 elementary students participated in this study, and a listening strategy questionnaire was used. ANOVA, MANOVA, Correlation and Multiple Regression Analysis were used to interpret the data. The results of this study reveal that younger participants used all four types of listening strategies, cognitive, compensation, metacognitive and affective, fairly often; however, the results also show that they differ in how frequently they use each strategy according to their listening proficiency. Overall, highly proficient learners use more strategies compared to less proficient learners. High proficiency learners use compensation strategies most and cognitive strategies least. Low proficient learners use affective strategies most and compensation strategies least. Moreover, the results showed no significant grade- or gender-related strategic behaviors, and also showed that L2 listening proficiency can be a significant predictor of strategic behavior of young learners. 12% of the variance in L2 strategic behaviors was attributable to L2 listening proficiency.

• Proceedings of the Korean Society of Applied Pharmacology
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• 1994.11a
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• pp.147-172
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• 1994

Aziridinylbenzoquinones such as 3, 6-diaziridinyl-1, 4-benzoquinone (DZQ) and its 2, 5-methyl analog (MeDZQ) require bioreductive activation in order to elicit their anticancer activities. To determine the involvement of DTD in the activation of these drugs, we have used a ligation-mediated polymerase chain reaction to map the intracellular alkylation sites in a sing1e copy gene at the nucleotide level. We have performed this analysis in two human colon carcinoma cells, one proficient (HT-29) and one deficient (BE) in DT-diaphorase (DTD) activity. In the DTD proficient HT-29 cell line, DZQ and MeDZQ were found to alkylate both 5'-(A/T)G(C)-3' and 5'-(A/T)A-3' sequences. This is consistent with the nucleotide preferences observed when DZQ and MeDZQ are activated by purified DTD to reactive metabolites capable of alkylating DNA in vitro [Lee, C. -S., Hartley, J. A., Berardini, M. D., Butler, J., Siegel., D., Ross, D., & Gibson, N. W. (1992) Biochemistry, 31: 3019-3025]. Surprisingly in the DTD-deficient BE cell line a pattern of alkylation induced by DZQ and MeDZQ similar to that observed in the DTD-proficient HT-29 cells was observed. This suggests that reductive enzymes other than DTD can be involved in activating DZQ and MeDZQ to DNA reactive species in vivo.