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- 저자 : ( Sehoon Jung ) (검색결과 79 건)
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Jung,Sehoon 한국외국어교육학회 2018 한국외국어교육학회 학술대회 자료집 Vol.2018 No.-
One of the central questions in recent second language (L2) processing research is whether the types of parsing heuristics and linguistic resources learners compute during online processing are qualitatively similar or different from those used by native speakers of the target language. In this line of research, the shallow structure hypothesis (SSH) proposed by Clahsen and Felser (2006a, 2006b) suggests that the nature of L2 processing is fundamentally and qualitatively different from L1 processing. According to the SSH, the type of syntactic representations adult learners utilize during online processing are structurally shallower and hierarchically less detailed, compared to those used by native speakers for two possible reasons: inadequate interlanguage grammatical representations and/or insufficient processing abilities to make use of relevant information in real time. The SSH further states that this is, by and large, the likely case regardless of learners’ proficiency or working memory capacities (WMC). This study sought to test the validity of these claims by investigating how proficient ESL learners process relative clause (RC) island structures while reading sentences containing filler-gap dependency constructions in real time. A total of 49 advanced ESL learners varying of age of arrival (AOA)—28 adult (AOA between 18-31) and 21 early learners (AOA between 2-9)— as well as 24 native English speaker controls, participated in an eye-tracking reading experiment and two different types of computerized non-verbal working memory span tests (operation-span and symmetry-span) adapted from Oswald, McAbee, Redick, & Hambrick, 2015). Developed based on the materials used in Omaki and Schulz (2011), each target sentence in the reading task had four experimental conditions in a 2 x 2 Latin square design, with plausibility (i.e., plausible and implausible) and island (non-island and island) manipulation, but participants received only one of those four conditions for each sentence. Results suggested that while all participants made use of active filler strategies to fill the gap as early as possible in the non-island environment, both the English control and ESL groups appeared to have rapidly deployed relevant syntactic information of island constraints regardless of their WMC, avoiding illicit filler-gap formation inside the relative clause islands. Some WM effects were found for adult the ESL learners only in the later region at the ultimate gap (i.e., canonical) where the parser is expected to perform a filler-gap reanalysis. At this region, the early ESL learners and native English speaker controls showed sensitivity to structural cues and gap identifications fairly early, initiating filler-gap reanalysis processes from earlier stages of processing. However, it was the only those with higher WMC among the adult ESL learners that presented such immediate filler-gap reanalysis effects during early stages of processing. In contrast, the adult learners with lower WMC showed sensitivity (i.e., reanalysis effect) only during the later stages of processing. These findings are further discussed in the light of the SSH and second language development.
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A TEM Study of Oxide Layers Formed during Decarburization Annealing of Electrical Steel
Jung, Sehoon,Kwon, Min Serk,Park, Jongho,Kim, Seung Bin,Huh, Yoon The Iron and Steel Institute of Japan 2011 ISIJ international Vol.51 No.7
<P>It is very important to know the morphology and chemical properties of subscales of oxide layers on surface for controlling and understanding high temperature oxidation in electrical steel. In present work, the oxide layers were investigated by various methods of transmission electron microscopy (TEM) such as scanning transmission electron microscopy (STEM), nanobeam electron diffraction (NBD), energy dispersive X-ray spectrometry (EDS), and electron energy loss spectrometry (EELS). The high-angle annular dark field (HAADF) of STEM could be a useful analysis technique to study the morphology of the oxide layers. The main oxides formed in the subscales during the decarburization annealing were fayalite, iron oxides, and silica, which were identified by EDS, NBD and EELS. The crystalline fayalites were found both in the surface region within several tens nanometers and in the region within a micrometer surrounding silica, and the atomic configuration in the unit cell of the fayalite was presented. Amorphous silica was formed both in the upper region of the subscales with a spherical shape and in the interface between the spherical silica and the iron matrix with a lamellar shape. TEM could be useful technique to characterize morphologies, microstructures and elemental compositions of oxides, and to understand the oxidation mechanism for the manufacture of the high quality electrical steel.</P>
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The effect of oral antibiotics on the skin microbiota in rosacea
( Sehoon Lee ),( Eun Sun Hong ),( Eun Jung Byun ),( Yu Ri Woo ),( Jeong Deuk Lee ),( Sang Hyun Cho ),( Hei Sung Kim ) 대한피부과학회 2019 대한피부과학회 학술발표대회집 Vol.71 No.2
Background: Given the widespread use of oral antibiotics for treatment of rosacea, it is important to understand the association of such antibiotic use with changes in the bacterial community of the skin. Objectives: We aimed to see the effect of oral antibiotics on the skin microbiota in rosacea patients Methods: The skin microbiota before and after 6 weeks of oral doxycycline (100 mg, twice a day) were compared. Skin areas on the cheek were sampled for 16s ribosomal RNA gene sequencing. Results: A total of 12 patients enrolled (11 females and 1 male, age: 20-79 years). The percentage of Cutibacterium acnes and Staphylococcus epidermidis were 13% and 28% before treatment. The percentage decreased to 7% (C. acnes) and 22% (S. epidermidis) after 6 weeks of oral doxycycline. Conclusion: Oral antibiotics had some effect on the skin microbial composition in rosacea patients which needs to be further examined.
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The effect of oral antibiotics on the skin microbiota characteristics in acne
( Sehoon Lee ),( Eun Sun Hong ),( Eun Jung Byun ),( Yu Ri Woo ),( Jeong Deuk Lee ),( Sang Hyun Cho ),( Hei Sung Kim ) 대한피부과학회 2019 대한피부과학회 학술발표대회집 Vol.71 No.2
Background: With the extensive use of oral antibiotics for treatment of moderate to severe acne, it is important to understand the association of such antibiotic use with changes not only in Cutibacterium acnes (C. acnes) but also in the complete bacterial community of the skin. Objectives: We sought to investigate the changes of skin microbiota in acne patients in association with oral antibiotics. Methods: The skin microbiota of acne patients, before and after taking 6 weeks of oral antibiotics (oral doxycycline, 100mg, twice daily) were compared. Skin areas on the cheek were sampled for 16S ribosomal RNA gene sequencing. Results: Twenty patients were included in this study (11 female, 8 males, ages between 11-44 years). Across all patients, antibiotic treatment was associated with reduction in the levels of C. acnes, Snodgrassella alvi, Corynebacterium matruchotii etc., and an increase in Neisseria oralis, Enterococcus hirae et al. There also was a significant change in microbial diversity represented by Shannon and Inverse Simpson index. Conclusion: In this study, oral antibiotic treatment of acne was associated with changes in the composition and diversity of the skin microbiota.
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Kim, Jung Kuk,Seo, Young-Kyo,Park, Sehoon,Park, Soo-Ah,Lim, Seyoung,Lee, Susie,Kwon, Ohman,Seo, Jeong Kon,Choi, Ung-Kyu,Ryu, Sung Ho,Suh, Pann-Ghill National Research Council of Canada = Conseil nati 2015 Biochemistry and cell biology Vol.93 No.3
<P> Mast cells are responsible for IgE-mediated allergic responses through the secretion of various inflammatory cytokines and mediators. Therefore, the pharmacological regulation of mast cell activation is an important goal in the development of novel anti-allergic drugs. In this study, we found that spiraeoside (SP) inhibits mast cell activation and allergic responses in vivo. SP dose-dependently inhibited the degranulation induced by IgE-antigen (Ag) stimulation in RBL-2H3 mast cells without cytotoxic effects. At the molecular level, SP reduced the Ag-induced phosphorylation and subsequent activation of phospholipase C-γ2 (PLC-γ2). Moreover, SP inhibited the phosphorylation of spleen tyrosine kinase (Syk), linker for activation of T cells (LAT), and downstream MAPKs, such as ERK1/2, p38, and JNK, eventually attenuating expression of TNF-α and IL-4. Finally, we found that SP significantly inhibited IgE-mediated passive cutaneous anaphylaxis (PCA) in mice. Taken together, our results strongly suggest that SP suppresses IgE-mediated mast cell activation and allergic responses by inhibiting Lyn-induced PLC-γ2/MAPK signaling in mast cells. </P>
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黃世薰(Sehoon Hwang),朴允美(Yoon-Mi Park),鄭炫敎(Hyun-Kyo Jung) 대한전기학회 2007 전기학회논문지 Vol.56 No.9
Recently, there is a need for research concerning the technologies and precaution methods against electronic bomb assaults. There lays perplex constitution and much coupling phenomenon in this type of system, and thus requires much time and memory in order to translate the system with the existing translation methods. Applying the EMT (Electromagnetic Topology) would prove much more efficient. In this paper, EMT has been applied to the circuit-like micro system, previously employed in micro systems. Also, each section has been interpreted using the BLT (Baum, Liu, Tesche) equation using the EMT, then reconstructed, consequentially interpreting an entire system. In this paper, a simple circuit containing active and passive elements based on a CPW has been interpreted employing the BLT equation, and has been proven by experiment using the circuit simulation, a simulation officially recognized for its accuracy in interpreting small structures. The interpretation results have been presented by an S-parameter, and by comparing the interpretation results attained through the BLT equation and that from common simulation to that from experimentation. that the BLT equation turned out to be the most reliable interpretation method could be found.
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