Processing Novel Phonological Structures in L2 Emergent Readers

Seunghyun Baek 팬코리아영어교육학회(구 영남영어교육학회) 2008 영어교육연구 Vol.20 No.4

This study investigated the phonological awareness of two groups of eighty-six Korean EFL/ESL kindergarteners in terms of semivowel placement differences between Korean and English and moreover, examined the relationship of their phonological representations to their vocabulary knowledge across the two languages. Children were assessed in Korean/English on an experimental task of production of semivowels (i.e., /j/ and /w/) in real/non-real words spoken to them and a test of lexical knowledge. Additionally, one group of ten monolingual English kindergarteners as a reference group was tested only in English. Results showed that Korean EFL children had a tendency to consider Korean GV structure as a cohesive unit and to regard English VG structure as two separate units. Their phonological representations across the two languages were highly related to Korean lexical knowledge. On the other hand, Korean ESL children tended to think of Korean GV structure as a cohesive unit, largely associated with Korean lexical knowledge and English VG structure as a cohesive unit, closely linked to English lexical knowledge. English monolinguals showed the same tendency to regard VG structure as a cohesive unit in English as did the Korean ESL children. These findings suggest the availability of language-specific phonological awareness, recognizing interlanguage phonologies in the acquisition of L2 phonological awareness and the potential importance of L2 vocabulary development in prompting L2 phonological awareness.

Cross-Language Transfer of Phonological and Orthographic Awareness in L1-Korean L2-English Early Literacy Acquisition

( Seunghyun Baek ),( Moongun Ji ) 21세기영어영문학회 2018 영어영문학21 Vol.31 No.1

The current study explored the cross-language transfer of L2 word recognition (WR) among 129 Korean EFL students. Participants underwent measures of L1-/ L2 phonological awareness (PA), L1-/ L2 orthographic awareness (OA), and L1-/ L2 unfamiliar-/ pseudo word recognition (WR). Findings showed that (a) the significant predictors of L1 unfamiliar WR were L1 PA-/ OA; (b) L1-/ L2 PA and L2 OA played an important role in L2 unfamiliar WR; and (c) L2 PA-/ OA were positively predictive of L2 pseudo WR. These results support the linguistic interdependence hypothesis that literacy skills can be transferred from one language to another (Cummins, 2000). The findings of the current study suggest the importance of L1 phonological components in L2 early literacy acquisition. Specifically, the present results propose that knowledge of L1 phonological elements such as syllable onsets, nuclei, codas, and bodies may play a crucial role in successful L2 WR among, at least, early Korean-English readers.

Teaching L2 Phoneme or Rime Awareness to L2 Readers

Seunghyun Baek 한국영어학학회 2009 영어학연구 Vol.- No.28

A short-term longitudinal study examined the effect of synthetic (phoneme-based) versus analytic (rime-based) phonics on L2 phonological awareness and L2 word reading. Forty-three Korean-speaking EFL children in third grade were randomly assigned to phoneme-based or rime-based group. The two groups had equal English phonological awareness and word reading skills. Twelve 40-minute teaching sessions over three months were provided to each group. After treatments, L2 phonological awareness (phoneme and rime) and L2 word reading with two conditions (unfamiliar real words and pseudo words) were measured. The findings of the two experimental tasks showed that children explicitly taught to read out words with phoneme-based reading strategy performed better on L2 phonological awareness and L2 word reading than those with rime-based reading strategy. Furthermore, L2 phoneme awareness across the two groups was largely associated with L2 word reading. More specifically, L2 nucleus (medial vowel or vowel cluster) and coda (final consonant or consonant cluster) awareness were stronger predictors of L2 word reading than L2 rime awareness. The results suggest that a letter recoding strategy based on L2 phoneme may play a crucial role in, at least, the early stages of learning to read in an L2.

이동에이전트 기반의 수요반응 서비스를 위한 분산제어 프레임워크

백승현(Seunghyun Baek),장민석(Minseok Jang),이연식(Yonsik Lee) 한국컴퓨터정보학회 2020 한국컴퓨터정보학회 학술발표논문집 Vol.28 No.2

SUS316L 강의 초음파 비선형 특성평가를 위한 경사입사기법

백승현(Seunghyun Baek),이태훈(Taehun Lee),김정석(Chungseok Kim),장경영(Kyung-Young Jhang) 한국비파괴검사학회 2010 한국비파괴검사학회지 Vol.30 No.4

본 연구에서는 고주기 피로를 받은 SUS316L 강에서의 초음파 비선형 특성평가를 위한 종파 경사입사기법을 연구하였다. Dog-bone형의 판상시편을 준비하여 시편 중심부에서 응력집중이 되며 각 위치마다 피로 손상이 다르도록 제작하였다. 수직투과법 외에 본 연구에서 새로이 제안한 경사입사법을 이용하여 초음파 비선형 파라미터를 측정하였다. 두 기법 모두에서 피로 손상 전보다 고주기 피로 손상 후 초음파 비선형 파라미터가 높게 나타났다. 특히, 응력 집중을 받은 시편 중심부에서 크게 증가하였다. 상대적인 초음파 비선형 파라미터는 피로 손상과 밀접한 상관성을 보였으며 결과적으로 종파를 이용한 경사입사기법은 피로 손상을 평가하는데 효과적인 기법이라 할 수 있다. The oblique incidence technique for ultrasonic nonlinear characterization was studied in stainless steel 316L alloy subjected to high cycle fatigue. A dog-bone plate specimen was prepared to make different faitgue-driven deformation at each position where the stress concentration could occur in the middle of specimen. In addition to the normal transmission technique, the oblique incidence technique which is newly suggested in this study, was used to measure ultrasonic nonlinear parameter. The fatigued specimen shows higher ultrasonic nonlinear parameter than the virgin specimen for both techniques. Ultrasonic nonlinear parameter highly increases in the middle of test specimen where the stress concentration existes. Relative nonlinear parameter has strong correlation with fatigue damage. Consequently, the oblique incidence technique with longitudinal wave can be potential to characterize high cycle fatigue damage.

열처리된 SA508 합금에서의 초음파 비선형성 측정

백승현(Seunghyun Baek),이태훈(Taehun Lee),김정석(Chungseok Kim),장경영(Kyung-Young Jhang) 한국비파괴검사학회 2010 한국비파괴검사학회지 Vol.30 No.5

본 연구에서는 합금강의 미세조직 특성인 결정립과 석출물이 초음파 비선형성에 미치는 영향을 실험적으로 연구하였다. 원자로 압력용기 재료인 SA508 Gr.3 저합금강을 오스테나이징과 템퍼링 조건을 변화시켜 모상의 오스테나이트 결정립 크기와 석출물 크기를 제어하였다. 결정립과 석출물 모두 크기가 조대해 짐에 따라 초음파 비선형 파라미터는 낮아지는 경향을 보이므로 초음파 비선형성이 결정립과 석출물과 밀접한 상관성이 있음을 알 수 있었다. 모상의 오스테나이트 결정립이 성장하더라도 패킷과 래스 하부업계의 영향으로 초음파 비선형 파라미터는 큰 변화를 보이지 않았다. 석출물의 영향으로 석출물의 크기 외에 정합변형을 일으키는 Mo₂C의 감소로 인해 초음파 비선형 파라미터가 큰 감소를 나타내었다. 본 연구결과 초음파 비선형성을 측정하므로써 결정립과 석출물의 미세조직 특성을 평가하는 것이 가능하다. In the present study, the influences of grains and precipitates of microstructural evolution on the ultrasonic nonlinearity have been experimentally investigated. The prior-austenite grain and precipitate size are controlled by the variation in austenitizing and tempering conditions in reactor pressure vessel materials of nuclear power plant, SA508 Gr.3 low alloys. The ultrasonic nonlinearity was found to have strong correlations with grains and precipitates since the ultrasonic nonlinear parameter β shows decrease trend with coarsening of grains and precipitates. Although the prior-austenite grain size increased, the β changed little due to the effects of subgrains, packets and laths. For the preciptate effects, the β decreased sharply due to decrease Mo₂C in causing the coherency stain in addition to the precipitate size. The results in this study may provide a potential for characterizing the microstructural evolution, grains and precipitates, by measuring the ultrasonic nonlinearity.

지역특화 문화기술로서 구성주의적 스토리텔링에 대한 연구

백승현(Baek, Seunghyun) 대동문화재단 2021 대동CT연구 Vol.1 No.1

Although it is understood that inequality related to jobs, medical care, and transportation is the main cause of the crisis of population concentration in the metropolitan area and local extinction, the difference in the quality of life that occurs depending on the degree of cultural industry development between regions has a great impact, especially on young people. This paper emphasizes the necessity of storytelling culture technology specializing in local culture as a way to overcome the crisis of local extinction and proposes constructivist operation through knowledge information platforms for the public interest. To this end, first, this research studies cultural technology and storytelling concepts and discuss the necessity to revitalize the local culture industry while considering regionally specialized storytelling as a culture technology. Next, after looking through the current status and problems of the regionally specialized storytelling projects, a constructivist management method is proposed as an alternative, and the theoretical basis for it is presented in detail. The constructivist storytelling method creates realistic contents based on the excellent cultural archetype discovered through a platform specializing in local culture and releases it into the metaverse environment, but gives consumers interactivity so that they can construct their own knowledge and thoughts. Finally, this study is expected to provide a motive for eventually relocating to the local provinces by positively affecting not only the residents but also the public as a whole through the revitalization of regionally specialized culture industries.

Field gradient calculation of HTS double-pancake coils considering the slanted turns and the splice

Baek, Geonwoo,Kim, Jinsub,Lee, Woo Seung,Song, Seunghyun,Lee, Onyou,Kang, Hyoungku,Ko, Tae Kuk The Korea Institute of Applied Superconductivity a 2017 한국초전도저온공학회논문지 Vol.19 No.1

To obtain Nuclear Magnetic Resonance (NMR) measurement of membrane protein, an NMR magnet is required to generate high intensity, homogeneity, and stability of field. A High-Temperature Superconducting (HTS) magnet is a promising alternative to a conventional Low-Temperature Superconducting (LTS) NMR magnet for high field, current density, and stability margin. Conventionally, an HTS coil has been wound by several winding techniques such as Single-Pancake (SP), Double-Pancake (DP), and layer-wound. The DP winding technique has been frequently used for a large magnet because long HTS wire is generally difficult to manufacture, and maintenance of magnet is convenient. However, magnetic field generated by the slanted turns and the splice leads to field inhomogeneity in Diameter of Spherical Volume (DSV). The field inhomogeneity degrades performance of NMR spectrometer and thus effect of the slanted turns and the splice should be analyzed. In this paper, field gradient of HTS double-pancake coils considering the slanted turns and the splice was calculated using Biot-Savart law and numerical integration. The calculation results showed that magnetic field produced by the slanted turns and the splice caused significant inhomogeneity of field.

Process Variation on Arch-structured Gate Stacked Array 3-D NAND Flash Memory

Baek, Myung-Hyun,Kim, Do-Bin,Kim, Seunghyun,Lee, Sang-Ho,Park, Byung-Gook The Institute of Electronics and Information Engin 2017 Journal of semiconductor technology and science Vol.17 No.2

Process variation effect on arch-structured gate stacked array (GSTAR) 3-D NAND flash is investigated. In case of arch-structured GSTAR, a shape of the arch channel is depending on an alignment of photo-lithography. Channel width fluctuates according to the channel hole alignment. When a shape of channel exceeds semicircle, channel width becomes longer, increasing drain current. However, electric field concentration on tunnel oxide decreases because less electric flux converges into a larger surface of tunnel oxide. Therefore, program efficiency is dependent on the process variation. Meanwhile, a radius of channel holes near the bottom side become smaller due to an etch slope. It also affects program efficiency as well as channel width. Larger hole radius has an advantage of higher drain current, but causes degradation of program speed.

Fabrication of dental gutta-percha points by injection molding process

Seunghyun Ko,Yong-Hoon Jeong,Tae-Gon Jung,Myong-Hyun Baek 대한치과재료학회 2022 대한치과기재학회 학술대회 Vol.2022 No.11