Tonal polarity and paradigm uniformity in the nominal paradigm of Xitsonga (S53)

Seunghun J. Lee 한국음운론학회 2013 음성·음운·형태론 연구 Vol.19 No.1

Xitsonga nouns display two types of plural formation. Plural prefixes can be added to a singular root (prefixation), or plural prefixes can take the place of singular prefixes (substitution). Tonal realizations differ in these two types, as the prefixation plurals show tonal polarity whereas the substitution plurals show paradigm uniformity effects in the absence of tonal polarity. The Xitsonga data differ from previous studies of tonal polarity in that the presence or absence of tonal polarity can target the same class of nouns that differ only in terms of how plurals are formed. A constraint-based analysis shows that the paradigm uniformity constraint (IDENT-BOT) outranks the OCP constraint, which in turn outranks the general tonal identity constraint (IDENT-T). (Central Connecticut State University and Zentrum für Allgemeine Sprachwissenschaft)

The roles of phonation and F0 in Zhuang

Seunghun J. Lee(이승훈),Jeremy Perkins,Julian Villegas 사단법인 한국언어학회 2016 한국언어학회 학술대회지 Vol.2016 No.6

Identifying the locus of L2 pronunciation: an exploratory study of geminate production by Chinese L2 learners of Japanese

Seunghun J. Lee,Gaku Kurita,Jeremy Perkins 서울대학교 외국어교육연구소 2018 외국어교육연구 Vol.22 No.-

Chinese L2 learners of Japanese are identified as showing difficulties in the production of Japanese geminates. The idea of being difficult-to-listen is embodied in the concept Comprehensibility (Derwing & Munro 2015). This study first reviews the native pronunciation of Japanese singleton vs. geminate contrast. Then, we report findings based on the pronunciation by 20 Chinese learners of Japanese and discuss the issue of comprehensibility in geminate production. While the contrast in the closure duration between singleton and geminate consonants shows a similar pattern to reported Japanese speech, the learners show large differences in the vowel duration preceding and following consonants. We report findings from a linear mixed model that was run with speaker as a random effect. The results show that participants do not make differences in vowel duration, or the difference in vowel duration is reversed from L1 Japanese speakers. Identifying the locus of the source of an L2 accent should be accompanied with intelligibility and comprehensibility. Such identification is important in increasing comprehensibility in speech that is already intelligible.

Poster Session : PS 0030 ; Cardiology : Clinical Characteristics and Outcomes of Acute Myocardial Infarction in Young Korean Adults

( Seunghun LEE ),( Ju Han KIM ),( Myung Ho JEONG ),( Hyukjin PARK ),( Ji Eun KIM ),( Youngkeun AHN ),( Jong Hyun KIM ),( Shung Chull CHAE ),( Young Jo KIM ),( Seung Ho HUR ),( In Whan SEONG ),( Take J 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1

Background: This study aims to investigate clinical features, angiographic fi ndings, and outcomes of young AMI patients. Methods: We analyzed major adverse cardiac events (MACE) in the Korea Acute Myocardial Infarction Registry from November 2005 to October 2010. Registered patients were divided into two groups, young age group (<45 years) and old age group (=65 years). Results: Young age group was composed of 1,248 patients (39.6±4.3 years) and old age group 9,759 patients (74.5±6.5 years). Male, smoking, family history and dyslipidemia were more frequent in young age group than those in old age group (96.6% vs. 57.5%, P<0.001; 86.9% vs. 45.7%, P<0.001; 15.5% vs. 4.8%, P<0.001; 13.4% vs. 9.5%, P<0.001). Young Korean adults with AMI had a shorter symptom-to-door (17.4±72.6 min vs. 24.2±77.7 min, P=0.002), but a longer door-to-balloon time (111.1±106.8 min vs. 101.8±92 min, P=0.043). The young age group had shown a favorable prognosis compared with old age group by Kaplan-Meier survival analysis (long-rank, P<0.001). However, there was no signifi cant difference in the adjusted MACE rate at one-year (HR 1.10, 95% CI 0.79-1.53, P=0.585), even after propensity-matched analysis (HR 0.80, 95% CI 0.52-1.23, P=0.307). Conclusions: Young Korean adults with AMI have similar clinical outcomes with old age patients, and therefore they should be treated aggressively like elderly patients.

이종 그래프상의 비유클리디안 데이터 분석을 위한 쌍곡 그래프 변형 인공 신경망

이승훈(Seunghun Lee),박현진(Hyeonjin Park),김현우(Hyunwoo J Kim) Korean Institute of Information Scientists and Eng 2021 정보과학회논문지 Vol.48 No.2

Convolution Neural Networks (CNNs), which are based on convolution operations, are used for various tasks in image classification, image generation, time series analysis, etc. Since the convolution operations are not directly applicable to non-Euclidean spaces such as graphs and manifolds, a variety of Graph Neural Networks (GNNs) have extended convolutional neural networks to homogeneous graphs, which has a single type of edges and nodes. However, in real-world applications, heterogeneous and hierarchical graph data often occur. To expand the operating range of GNNs to the graphs that have multiple types of nodes and edges with the hierarchy, herein, we propose a new model that integrates Hyperbolic Graph Convolution Networks (HGCNs) and Graph Transformer Networks (GTNs).

An acoustic study of fricated vowels in Nuosu Yi: an exploratory study

Perkins, Jeremy,Lee, Seunghun J.(이승훈),Li, Xiao,Liu, Hongyong 한국음성학회 2014 말소리와 음성과학 Vol.6 No.4

Fricated nuclei in Nuosu Yi were found to be more correctly described as fricated vowels, rather than syllabic fricatives due to the presence of clear formant structures typical of front vowels. In this exploratory study, two types of fricated nuclei were examined: retroflex “yr” and non-retroflex “y.” The retroflex nucleus “yr” had higher F1 and lower F3 than non-retroflex “y”, indicating a lower tongue height. On the other hand, F2 was found to correlate not with nucleus retroflexion, but instead with onset consonant retroflexion: F2 was higher following retroflex onsets, in both vowels. This effect was persistent through the entire vowel, suggesting a phonological effect, rather than a coarticulatory one. Interpretation of the F2 results require accompanying articulatory data since the usual coupling of F2 and tongue backness does not always hold for retroflex vowels. Examining the articulation of the fricated nuclei in Nuosu Yi is a direction for future research.

Structural evolution across the insulator-metal transition in oxygen-deficient BaTiO3−δstudied using neutron total scattering and Rietveld analysis

Jeong, I.-K.,Lee, Seunghun,Jeong, Se-Young,Won, C. J.,Hur, N.,Llobet, A. American Physical Society 2011 Physical review. B, Condensed matter and materials Vol.84 No.6

Aging-Related Differences in the Resolution of Ambiguity from Case Marker Deletions in a Verb-Final Language

Jee Eun Sung(성지은),Seunghun J. Lee(이승훈),Bora Eom(엄보라) 한국언어청각임상학회 2019 Communication Sciences and Disorders Vol.24 No.3

배경 및 목적: 본 연구의 목적은 한국어의 형태론적 중의문을 해결하는 과정에서 청년층과 노년층 간 차이가 있는지 살펴보는 것이다. 보다 구체적으로, 형태론적 중의문을 형성하는 명사구의 개수(1 vs. 2) 및 동사의 형태(능동형 vs. 피동형)를 조절하였을 때 그림선택 과제(picture-selection task)에서 청년층과 노년층 간 차이가 유의한지를 살펴보았다. 방법: 한국어를 모국어로 하는 청년층 49명, 노년층 56명으로 총 105명이 본 연구에 참여하였다. 형태론적 중의문은 명사구에서 조사를 생략하여 구성하였으며, 명사구의 개수는 1개인 조건과 2개인 조건으로 구분된다. 각 명사구 조건별로 동사의 형태를 능동형과 피동형으로 나누어 제시하였다. 실험자극은 청각적으로 제시하였으며, 조사가 생략된 중의문을 듣고 명사구를 주격으로 해결하는 선호도(nominative-initial preference)를 파악할 수 있도록 그림선택 과제를 실시하였다. 결과: 연구 결과, 청년층과 노년층 간 중의문의 명사구를 주격으로 해결하는 선호도에서 유의한 차이가 나타났다. 청년층은 전반적으로 모든 조건에서 명사구를 주격으로 해결하는 전략을 뚜렷하게 사용한 반면, 노년층은 이러한 선호도가 청년층에 비해 낮은 것으로 나타났다. 논의 및 결론: 본 연구 결과를 통해 노년층이 중의문을 해결하는 데 있어 청년층에 비해 주격선호전략을 사용하는 능력이 감퇴되었음을 알 수 있다. 모호한 정보를 처리할 때, 집단 간 전략사용선호도에서 차이가 있다는 점은 노화에 따른 문장이해 능력의 저하가 일어나는 기저와 관련이 있을 수 있으며, 이러한 노화의 기저를 파악하는 데 문장해결 능력 및 전략에 대한 기초연구가 더욱 이루어질 필요가 있음을 시사한다. Objectives: This study investigated how age differences impact the resolution of syntactic ambiguities arising through the manipulation of verb voice types and the number of noun phrases (NPs) in stimuli sets. The stimuli consisted of ambiguous sentences that we created by deleting case markers in Korean sentences. We examined resolution strategies from the viewpoint of the nominative-initial preference. Methods: A total of 105 Korean-speaking individuals participated in the study (young adults 49, old adults 56). We manipulated the number of NPs (1 vs. 2) and the verb voice types (active vs. passive) in morphologically ambiguous sentences with NPs that had no case markers. We administered a picture-selection task to examine this nominative-initial preference. Results: We found significant differences in the use of the nominative-initial strategy between the two age groups. Younger adults consistently demonstrated a preference for the nominative-initial strategy across conditions. In contrast, elderly adults presented less preference for the nominative-initial strategy than the younger adults. Conclusion: These findings indicate that elderly adults performed significantly differently in the engagement of the more frequently used syntactic template-based strategy (nominative-initial strategy) than younger adults when resolving syntactic ambiguity. The differences between the age groups in ambiguity resolution strategy may explain aging-related declines in sentence comprehension abilities.