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이윤 한국소음진동공학회 2004 한국소음진동공학회 논문집 Vol.14 No.11
An experimental study on firing noise of K2 rifle was performed. Firing noises of K2 rifle were measured at close distance to rifle. Firing noise of K2 rifle which made in Korea, has not measured before. The measurement of firing noise at close distance is not simple, because the amplitude of firing noise is much bigger than the measuring limit of ordinary sound level meter even though it uses a signal attenuator. The measurement of firing noise at close distance is necessary for noise source positioning and for obtaining the sound power of K2 rifle. By this experimental study, the firing noise levels of K2 rifle at different positions are obtained and these data can be used to Predict the sound pressure level at any distance from muzzle of the rifle. Also these data can be used to calculate the threshold shift of gunner's ear.
이윤 현대영어교육학회 2017 현대영어교육 Vol.18 No.1
The purpose of the current study was to explore elementary school students’ word recognition strategies and to examine the effects of English textbooks on their strategy use. Word identification responses of one hundred and seventy 3rd, 4th, and 5th graders were obtained in order to infer their word recognition strategies. From their oral reading, only reading errors were analyzed for evaluating their strategy use. The strategies of individual children were identified using the criteria established for classification. The analyzed data showed that sight word strategies were used by students at all grades dominantly, but the use of phonics strategies increased at 4th and 5th grades. This indicates that students’ strategies are gradually changed from sight word strategies to phonics strategies as their reading skills develop. In particular, low achievers used sight word strategies substantially while high achievers used phonics strategies. Results indicate that the English textbooks children are exposed to may shape students’ word recognition strategies. On the basis of results, suggestions for supporting beginning readers are provided.
이윤,하원영 한국외국어교육학회 2013 Foreign languages education Vol.20 No.1
The purpose of this study is to investigate the effects of repetitive reading and extensive reading on English reading fluency of the elementary school students. To accomplish the purpose, the 122 6th graders of elementary school were taught using different reading programs: Repetitive reading and extensive reading. After the experiment, students were assessed by decoding accuracy in text, reading rate, and comprehension ability, and the assessment results were analyzed using t-test. The analyzed data showed that the repetitive reading had a significant impact on the reading rate, decoding accuracy, and parsing skills of the students. In particular, the repetitive reading led to make a significant progress on their word recognition. The repetitive reading group who received teacher's support and feedback scored higher on their post-test than the extensive reading group. It seemed that repeating the teacher's appropriate modeling of reading rate and parsing as well as immediate correction of student's reading errors was beneficial to their reading rate, accuracy and parsing skill. And the student's improved comprehension skills indicated the positive influence of the repetitive reading activity. On the basis of the findings of the study, appropriate reading approaches were suggested for the reading fluency development.
이윤 한국외국어교육학회 2015 Foreign languages education Vol.22 No.1
The purpose of this study was to explore the relationship between prosody and reading comprehension of elementary school students in Korea. To achieve the purpose of the study, 114 fifth and sixth graders were selected from three schools of Seoul city and Gyeonggi province, and their prosody, word recognition and comprehension were assessed. In order to measure their prosody, students were asked to read a reading text orally for one minute, and the teacher checked their reading rate, decoding accuracy, and prosody. Students’ prosody was measured through Clay and Imlach’s (1971) method. The results of this study showed that while most students gained higher score in word recognition and reading rate, their prosodic features was found comparatively weak. It also revealed a correlation between the three sub-categories of prosody and reading comprehension. Based on the results of this study, it could be concluded that prosodic reading features of Korean EFL students have co-relations with comprehension, even if their prosodic feature is weak. Finally some ideas for enhancing prosody in L2 students’ reading instruction were suggested.
Vero Cell과의 공동배양이 체외에서 생쥐 배아발생에 미치는 영향
이윤,박준홍,강혜나,김용봉,이응수,박성관,Lee, Yoon,Park, June-Hong,Kang, He-Na,Kim, Yong-Bong,Lee, Eung-Soo,Park, Sung-Kwan 대한생식의학회 1997 Clinical and Experimental Reproductive Medicine Vol.24 No.2
Embryos of most mammalian species grown in vitro would undergo developmental arrest at the approximate time of genomic activation. Stage-specific cell block and the resulting rapid loss of embryo viability in conventional culture media have limited the duration for which embryos may be cultured prior to transfer. As a result, embryos are usually transferred to the uterus at the 4-to 8-cell stage to avoid the loss of viability associated with long-term in vitro culture. Early transfer has led to asynchrony of the endometrium-trophectoderm interaction at the time of implantation and a resultant reduction in the rate of implantation. To overcome these problems, a variety of co-culture systems has been devised in which embryos can develop for a longer period prior to embryo transfer. Vero cells, derived from African green monkey kidney, share a common embryologic origin with cells from the genital tract. In addition, they are potentially safe to use, since they are highly controlled for viruses and other contaminants. Therefore, co-culture using Vero cells has been widely utilized to enhance embryo viability and development, although not without controversies. We thus designed a series of experiments to demonstrate whether Vero cells do indeed enhance mouse embryo development as well as to compare the efficacy of co-culturing mouse 1-cell embryos on Vero cell monolayer in both Ham's F-10 and human tubal fluid (HTF) culture media. 1-cell stage ICR mouse embryos were cultured either in the presence of Vero cells (Group A) or in conventional culture medium alone (Group B). In Ham's F-10 significantly more 3-to-8cell embryos developed in group A than group B (59.8 versus 10.0%; p<0.01). In contrast, there was no significant difference in embryonic development both group A and group B in HTF. However, significant differences were noted only in later embryonic stage (13 and 0%; p<0.05 of group A and B respectively, hatching or hatched). In Ham's F-10, we also could observe the beneficial effect of Vero cell on hatching process (70.7 and 42.1%; p<0.05 of group A and group B respectively).