Beyond Nativeness versus Nonnativeness in the Construction of Teacher Identity in the Context of Korean as a Foreign Language

Kim,Jeongyeon,Smith,Hye Young 한국사회언어학회 2019 사회언어학 Vol.27 No.2

This study examines multiple language-identities embedded within the emerging professional teacher identity of international graduate students teaching Korean as a foreign language (KFL). Situated in the context of Korean classrooms at an American university, this study draws data from two rounds of interviews with three instructors (one nonnative and two native Korean speakers). The qualitative analysis reveals that their professional teacher identity revolves around multiple language identities grounded in their L1 cultural norms and perceived English language proficiencies. Their views and undertakings of local cultural norms indicate the varying ways in which these instructors projected their L1 and L2 identities onto their emergent teacher identity. Given the vexed relationship between notions of teacher authority in her L1 Japanese culture and the local norms of interaction, the nonnative teacher maintained authority by establishing a certain distance from her students. By contrast, the native teachers accommodated the local understandings of teacher authority and (re)shaped their view of a teacher to the locally-defined professionalism, a teacher like ‘a friend’. The negotiated identity of the KFL teachers improved classroom interaction and engendered positive view about teaching. The findings are discussed to highlight foreign language teacher identity in a teacher education program.

Amygdala depotentiation ex vivo requires mitogen-activated protein kinases and protein synthesis

Kim, Jeongyeon,Park, Sungmo,Lee, Sukwon,Choi, Sukwoo Lippincott Williams Wilkins, Inc. 2009 NEUROREPORT - Vol.20 No.5

We have recently characterized a form of ex vivo depotentiation (depotentiationex vivo), which correlates tightly with fear extinction, at thalamic input synapses onto the lateral amygdala. Here, we examined the effects of learning-attenuating drugs, reported to impair fear extinction when microinjected into the basolateral amygdala, on depotentiationex vivo. U0126, a mitogen-activated protein kinase inhibitor, and cycloheximide, a protein synthesis inhibitor, blocked depotentiationex vivo. However, ifenprodil, an NR2B-containing NMDA receptor inhibitor, did not alter depotentiationex vivo, although it blocked amygdala long-term potentiation. These findings indicate that amygdala depotentiation shares some molecular processes with learning and further suggest that different forms of synaptic plasticity in the basolateral amygdala mediate fear extinction.

The β-Complex of Three-Dimensional Spheres and its Applications

Jeongyeon Seo,Donguk Kim,Youngsong Cho,Joonghyun Ryu,Deok-Soo Kim 대한산업공학회 2007 대한산업공학회 추계학술대회논문집 Vol.2007 No.11

Preliminary study of presumptive intradural-intramedullary intervertebral disc extrusion in 20 dogs

Kim, Jaehwan,Kim, Hyoju,Hwang, Jeongyeon,Eom, Kidong The Korean Society of Veterinary Science 2020 Journal of Veterinary Science Vol.21 No.2

Background: Intradural-intramedullary intervertebral disc extrusion (IIVDE) is a rare condition of intervertebral disc disease. However, the diagnosis of IIVDE is challenging because the prognosis and imaging characteristics are poorly characterized. Objectives: We aimed to describe the clinical and imaging characteristics of tentatively diagnosed IIVDE in dogs to assess the prognostic utility of neurological grade and magnetic resonance imaging (MRI) findings. Methods: Twenty dogs were included in this retrospective cohort study. Results: Nonchondrodystrophic breeds (n = 16) were more predisposed than chondrodystrophic breeds. Most dogs showed acute onset of clinical signs. Neurological examination at admission showed predominant non-ambulatory paraparesis (n = 9); paresis (n = 16) was confirmed more frequently than paralysis (n = 4). Follow-up neurological examination results were only available for 11 dogs, ten of whom showed neurological improvement and 8 showed successful outcomes at 1 month. The characteristic MRI findings include thoracic vertebra (T)2 hyperintense, T1 hypointense, intramedullary linear tracts with reduced disc volume, and cleft of the annulus fibrosus. None of the MRI measurements were significantly correlated with neurological grade at admission. Neurological grade did not differ according to the presence of parenchymal hemorrhage, parenchymal contrast enhancement, and meningeal contrast enhancement. Neurological grades at admission showed a statistical correlation with those observed at the 1-month follow-up (r = 0.814, p = 0.02). Conclusions: IIVDE is a rare form of disc extrusion commonly experienced after physical activity or trauma and most frequently affects the cranial-cervical and thoracolumbar regions of nonchondrodystrophic dog breeds. Neurological score at admission emerged as a more useful prognostic indicator than MRI findings in dogs with suspected IIVDE.

A Case of Posterior Reversible Encephalopathy Syndrome with Similar Symptoms as Transient Global Amnesia

Jeongyeon Kim,Young Ik-Jung,서정희,Hee Jin Lee,Mun Kyung Sunwoo 대한치매학회 2018 Dementia and Neurocognitive Disorders Vol.17 No.4

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소비자 제품의 사용 경험 품질 평가를 위한 평가 요인 도출

Jeongyeon Kim,Jihee Kim,Seonghwan Bang,Sungwook Jung,Sangwoo Bahn 대한인간공학회 2018 대한인간공학회 학술대회논문집 Vol.2018 No.5

mGluR2/3 in the Lateral Amygdala is Required for Fear Extinction: Cortical Input Synapses onto the Lateral Amygdala as a Target Site of the mGluR2/3 Action

Kim, Jihye,An, Bobae,Kim, Jeongyeon,Park, Sewon,Park, Sungmo,Hong, Ingie,Lee, Sukwon,Park, Kyungjoon,Choi, Sukwoo American College of Neuropsychopharmacology 2015 Neuropsychopharmacology Vol.40 No.13

Various subtypes of metabotropic glutamate receptors (mGluRs) have been implicated in fear extinction, but mGluR2/3 subtype has not been tested. Here, we found that microinjection of an mGluR2/3 antagonist, LY341495, into the lateral amygdala (LA), but not into the adjacent central amygdala (CeA), impaired extinction retention without affecting within-session extinction. In contrast, we failed to detect any significant changes in motility and anxiety during a period when extinction training or retention was performed after LY341495 injection, suggesting that the effect of LY341495 is specific to conditioned responses. Subsequently, on the basis of a previous finding that a long-term potentiation of presynaptic efficacy at cortical input synapses onto the lateral amygdala (C-LA synapses) supports conditioned fear, we tested the hypothesis that activation of mGluR2/3 leads to fear extinction via a long-term weakening of presynaptic functions at C-LA synapses. Fear extinction produced a decrease in C-LA synaptic efficacy, whereas LY341495 infusion into the LA blocked this extinction-induced C-LA efficacy decrease without altering synaptic efficacy at other LA synapses. Furthermore, extinction enhanced paired pulse ratio (PPR) of EPSCs, which inversely correlates with presynaptic release probability, whereas LY341495 infusion into the LA attenuated the extinction-induced increase in PPR, suggesting the presence of mGluR2/3-dependent presynaptic changes after extinction. Consistently, extinction occluded a presynaptic form of depression at C-LA synapses, whereas the LY341495 infusion into the LA rescued this occlusion. Together, our findings suggest that mGluR2/3 is required for extinction retention and that the mGluR2/3 action is mediated by the long-term weakening of release probability at C-LA synapses.

Zeolitic imidazolate frameworks derived novel polyhedral shaped hollow Co-B-O@Co₃O₄ electrocatalyst for oxygen evolution reaction

Kim, Dongwon,Kim, Daekyu,Jeon, Youngmoo,Li, Yong,Lee, Jeongyeon,Kang, Jeongmin,Lee, Lawrence Yoon Suk,Piao, Yuanzhe Elsevier 2019 ELECTROCHIMICA ACTA Vol.299 No.-

<P><B>Abstract</B></P> <P>The development of highly effective and low-cost non-noble metal electrochemical catalysts for oxygen evolution reactions (OER) is a major challenge for overall water splitting and rechargeable metal-air batteries. In this study, we develop a novel hollow cobalt-borate modified cobalt oxide composite (denoted by Co-B-O@Co<SUB>3</SUB>O<SUB>4</SUB>) catalyst derived from zeolitic imidazolate framework-67 (ZIF-67) for electrochemical OER. The Co-B-O@Co<SUB>3</SUB>O<SUB>4</SUB> was easily synthesized via pyrolysis of ZIF-67 in Ar and air to produce hollow Co<SUB>3</SUB>O<SUB>4</SUB> (denoted by h-Co<SUB>3</SUB>O<SUB>4</SUB>), followed by simple NaBH<SUB>4</SUB> treatment at ambient temperature for 4 h. The unique polyhedral morphology was well preserved during the NaBH<SUB>4</SUB> treatment. Benefiting from its structural and compositional merit, the as-synthesized Co-B-O@Co<SUB>3</SUB>O<SUB>4</SUB> exhibit excellent electrocatalytic activity and long-term stability for OER. Also, we conducted the OER test using a Co-B-O@Co<SUB>3</SUB>O<SUB>4</SUB> catalyst in a neutral pH environment for further investigation. Our study can provide an insight into catalyst modification step to enhance the overall performance while keeping its physical structure simultaneously. using metal-organic framework for the electrochemical catalyst thus can be recognized as a method for producing a highly active, long-term working and novel engineered electrocatalyst for OER applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Co-B-O@Co<SUB>3</SUB>O<SUB>4</SUB> was prepared using calcination-NaBH<SUB>4</SUB> treatment strategy with a facile and energy efficient method. </LI> <LI> A distinctive polyhedral morphology of Co-B-O@Co<SUB>3</SUB>O<SUB>4</SUB> was well preserved after the NaBH<SUB>4</SUB> treatment of its precursor material. </LI> <LI> Co-B-O@Co<SUB>3</SUB>O<SUB>4</SUB> was employed for the electrochemical oxygen evolution reaction. </LI> <LI> Co-B-O@Co<SUB>3</SUB>O<SUB>4</SUB> showed excellent catalytic performance and long-term durability for oxygen evolution reaction in basic media. </LI> </UL> </P>

Corrective Feedback and Engineering Students’ Perceptions of Interdisciplinary Study Through English-Medium Instruction

Jeongyeon Kim,Victoria Kim 한국외국어교육학회 2020 Foreign languages education Vol.27 No.3

This study explores the effects of teacher feedback on engineering students’ perceptions of learning a business subject and English development in the context of English-medium instruction (EMI). Using a mixed method, it examines specific contributions of teachers’ extensive feedback to the students’ emerging perceptions of interdisciplinary education and EMI. The quantitative section includes questionnaire responses of two groups of students enrolled in four sections of an entrepreneurship course: the control group (CG) in which the students received limited feedback in the lecture-style EMI (n=137) and the experimental group (EG) of extensive corrective feedback (n=133). These results are cross-examined by a semi-structured focus group interview with four respondents. The analysis shows that the university seniors’ mean satisfaction score with EMI, despite staying around the mid-point, was higher than that of the others, and significantly more so than the freshmen group. Notably, EG students appreciated EMI more than CG students. Subsequent findings establish that extensive feedback correlates with the increased positivity towards learning entrepreneurship and, more importantly, English development. This study thus proposes English programs for specific purposes and a support system including an EMI-specialized teaching methodology.

Roles of Context in L2 Learners’ Self-Regulatory Actions: The Case of Videoconference-Based EFL Writing Course

Jeongyeon Kim,Soo-Ok Kweon 한국영어학회 2023 영어학 Vol.23 No.-

To date, studies of English as a foreign language (EFL) learners’ motivational regulation have centered on the traditional offline classroom setting with little consideration of the contingency of learning context. The aims of this study were to reveal the dynamics of EFL learners’ self-regulatory responses to and their instructors’ perspectives of videoconference-based writing class. Specifically, this study focused on several factors embedded in the context, including native English-speaking instructors, videoconference platform, and English-medium instruction (EMI). A mixed method was used to analyze the questionnaire responses of 264 students from two science and engineering universities and subsequent interviews with seven students and ten native English-speaking instructors. The analyses revealed that learners’ three proficiency levels affected their engagement with instructor feedback and text processing, the most prevalent motivational regulation strategies. In the two lower proficiency groups, these regulatory actions did not correlate with the EMI factor. The beginner group in particular struggled to regulate motivation, disfavoring the videoconference platform. In the analysis of instructor interviews, the discrepancy in the students’ self-regulatory actions among proficiency levels was rarely acknowledged or addressed by the instructors. The findings are discussed to give insight into EFL writing instruction in the emerging higher education context.