Perceptual development in the categorization of pitch accent contrasts in children and adults

Kim,Jungsun 한국음성학회 2011 말소리와 음성과학 Vol.3 No.3

This paper examines the categorical labeling of lexical pitch accent contrasts in North Kyungsang and South Cholla Korean listeners. It focuses specifically on investigating whether the pitch accent perception of adults and children has a dialect-specific effect. To evaluate the development of perceptual identification, slopes, intercepts, and positions at categorical boundaries were computed using a logistic regression function. The results showed that differences in slopes and intercepts were significant between North Kyungsang child and adult listeners, but the same was not the case for the positions at boundaries. As far as South Cholla child and adult listeners were concerned, there was a significant difference in slopes, but not intercepts and positions at boundaries. In the present study, the comparison of intercepts and slopes at the boundaries indicated developmental differences between North Kyungsang adult and child listeners. This improvement in categorical proportion seems to be a result of developmental changes in categorical perception. For South Cholla adult and child listeners, however, perception of the non-native contrast becomes less categorical.

Prevalence of Metabolic Syndrome in Patients with Schizophrenia in Korea: A Multicenter Nationwide Cross-Sectional Study

JungSun Lee,JunSoo Kwon,Daeho Kim,SungWan Kim,JaeJin Kim,JongHoon Kim,HeeJung Nam,Seunghyong Ryu,IlHo Park,SukKyoon An,HongSeok Oh,Seunghee Won,Kanguk Lee,KyuYoung Lee,SeungHwan Lee,YuSang Lee,JungSeo 대한신경정신의학회 2017 PSYCHIATRY INVESTIGATION Vol.14 No.1

Objective-We designed a nationwide study with limited exclusion criteria to investigate the prevalence of metabolic syndrome (MetS) in Korea and its relationship with antipsychotic medications. Methods-This multicenter, cross-sectional, and observational study included patients diagnosed with schizophrenia or schizoaffective disorder. Sixteen hospitals enrolled 845 patients aged 18 to 65 years prescribed any antipsychotic medication between August 2011 and August 2013. MetS was diagnosed using the criteria of the modified Adult Treatment Panel III of the National Cholesterol Education Program with the Korean abdominal obesity definition (waist circumference ≥85 cm in women, ≥90 cm in men). Results-The prevalence of MetS in all patients was 36.5% and was significantly higher in men than women (men, 40.8%; women, 32.2%) and was significantly correlated with age [odds ratio (OR) 1.02] and duration of illness (OR 1.03). The prevalence of MetS across antipsychotic drugs in the major monotherapy group was as follows: 18.8% for quetiapine, 22.0% for aripiprazole, 33.3% for both amisulpride and paliperidone, 34.0% for olanzapine, 35% for risperidone, 39.4% for haloperidol, and 44.7% for clozapine. Conclusion-The prevalence of MetS is very high in patients with schizophrenia or schizoaffective disorder. Screening and monitoring of MetS is also strongly recommended.

Optimal Design of a High-Agility Satellite with Composite Solar Panels

Kim, Yongha,Kim, Myungjun,Kim, Pyeunghwa,Kim, Hwiyeop,Park, Jungsun,Roh, Jin-Ho,Bae, Jaesung The Korean Society for Aeronautical and Space Scie 2016 International Journal of Aeronautical and Space Sc Vol.17 No.4

This paper defines mode shape function of a composite solar panel assumed as Kirchhoff-Love plate for considering a torsional mode of composite solar panel. It then goes on to define dynamic model of a high-agility satellite considering the flexibility of composite solar panel as well as stiffness of a solar panel's hinge using Lagrange's theorem, Ritz method and the mode shape function. Furthermore, this paper verifies the validity of dynamic model by comparing numerical results from the finite element analysis. In addition, this paper performs a dynamic response analysis of a rigid satellite which includes only natural modes for solar panel's hinges and a flexible satellite which includes not only natural modes of solar panel's hinges, but also structural modes of composite solar panels. According to the results, we confirm that the torsional mode of solar panel should be considered for the structural design of high-agility satellite. Finally, we performed optimization of high-agility satellite for minimizing mass with solar panel's area limit using the defined dynamic model. Consequently, we observed that the defined dynamic model for a high-agility satellite and result of the optimal design are very useful not only because of their optimal structural design but also because of the dynamic analysis of the satellite.

Optimal Design of a High-Agility Satellite with Composite Solar Panels

Yongha Kim,Myungjun Kim,Pyeunghwa Kim,Hwiyeop Kim,Jungsun Park,Jin-Ho Roh,Jaesung Bae 한국항공우주학회 2016 International Journal of Aeronautical and Space Sc Vol.17 No.4

This paper defines mode shape function of a composite solar panel assumed as Kirchhoff-Love plate for considering a torsional mode of composite solar panel. It then goes on to define dynamic model of a high-agility satellite considering the flexibility of composite solar panel as well as stiffness of a solar panel’s hinge using Lagrange’s theorem, Ritz method and the mode shape function. Furthermore, this paper verifies the validity of dynamic model by comparing numerical results from the finite element analysis. In addition, this paper performs a dynamic response analysis of a rigid satellite which includes only natural modes for solar panel’s hinges and a flexible satellite which includes not only natural modes of solar panel’s hinges, but also structural modes of composite solar panels. According to the results, we confirm that the torsional mode of solar panel should be considered for the structural design of high-agility satellite. Finally, we performed optimization of high-agility satellite for minimizing mass with solar panel’s area limit using the defined dynamic model. Consequently, we observed that the defined dynamic model for a high-agility satellite and result of the optimal design are very useful not only because of their optimal structural design but also because of the dynamic analysis of the satellite.

Some Aspects in Mimicry of Lexical Pitch Accent by Children and Adults

Jungsun Kim 한국언어학회 2012 언어 Vol.37 No.2

A Comparison between the Second KoreanWorking Conditions Survey (KWCS) and the First KWCS

Kim, Young Sun,Park, Jungsun,Rhee, Kyung Yong,Kim, Hye Min Occupational Safety and Health Research Institute 2015 Safety and health at work Vol.6 No.2

Background: The study was designed to assess the changes in working conditions through a comparative analysis of the characteristics of working conditions in 2006 and 2010. Methods: We performed a comparative analysis of the data related to the first Korean Working Conditions Survey (KWCS) and the second KWCS in the categories of demographic characteristics, quality of labor, exposure to hazards, and health problems. Results: From our analysis of the demographic characteristics, we saw an increase in labor force participation rate of women and elderly people. As a result of the investigation with regards to working hours, the ratio of employees who worked for ${\geq}49$ hours per week was decreased and the ratio of employees who worked for ${\geq}40h/wk$ increased. As for exposure to hazards, exposure to tobacco smoke notably decreased in 2010 compared with 2006. With regards to health problems, there was a sharp increase in the number of people who complained of muscle pain in their arms and legs. Conclusion: KWCS data included many aspects of working conditions as a nationwide sample. In addition, because this is a periodic nationwide survey, the labor force, working hours, harmful factor exposure, and the change in health problems characteristics according to the flow of time could be investigated. The information comparing the main results of the first survey conducted in 2006 and the second survey conducted in 2010 obtained through this study can be used as an important base material for the establishment of the national policy.

DOUBLE Accent in Loanwords of North Kyungsang Korean and Variable Syllable Weight

Kim, Jungsun 서울대학교 언어교육원 (구 서울대학교 어학연구소) 2009 語學硏究 Vol.45 No.1

This paper provides an analysis of the loanword tone patterns in North Kyungsang Korean (NKK), especially focused on the issue of contextual syllable weight in disyllable words. The loanword tone patterns in NKK is predictable by syllable weight, unlike native words. In particular, according to Kenstowicz and H-S Sohn’s (2001) generalization for NKK loanwords, if the initial syllable of the output is heavy, the word falls into the DOUBLE accent class, realized with a sequence of high tones. But this fails to explain the realization of PENULT accent occurring against DOUBLE accent in spite of the presence of an initial heavy syllable. This paper proposes that variable weight of closed syllable occurs as a consequence of the conflict between metrical constraints and the constraints determining the weight of the coda, as in Y-H Chung (2002).

The imitation patterns of adults and children on f0 intervals in North Kyungsang Korean

Jungsun Kim 한국음성학회 2019 말소리와 음성과학 Vol.11 No.2

The present study examines whether pitch range variation in North Kyunsang Korean shows a categorical or continuous function. Specifically, the study is focused on the data imitated by adults and children in the North Kyungsang region. To investigate pitch range variation, the log-produced f0 intervals were measured and statistically analyzed. The results of the study are as follows. First, both the adults’ and children’s imitations were more categorical than continuous, especially for the HL-LH patterns. For the other pitch accent patterns, such as HH-HL and HH-LH, the curves were continuous or flat for most of the speakers. Second, the children’s imitations were poorer than those of the adults. That is, the children’s imitative responses were shown as more continuous or flat curves than categorical. For the children, the HL-LH pattern showed a categorical function at the midpoint of the curves, though the shifts were not as distinctive as the adults’ data. This implies that the imitative responses of children follow the perceptual and productive trace of adults’ speech behavior.

The effect of context speech rate in the recognition of English auxiliary verbs

Jungsun Kim 한국음운론학회 2014 음성·음운·형태론 연구 Vol.20 No.1

This paper investigates the context-dependent speech rate to perceive function words (i.e., auxiliary verbs). Whether the rate-dependent recognition is affected by the sequence of words with or without auxiliary verbs is examined. The experiment used two types of spoken sentences: (1) those with an auxiliary verb and (2) those in which the auxiliary verb was phonetically deleted. The recognition of auxiliary verbs was not greater for contexts with a normal or fast speech rate than for context temporal information (e.g., speech rate). Interestingly, the shift of context was not focused on the speech rate of the target word (i.e., auxiliary verb). Rather, the shift between the target and context in speech rate functioned as a cue to perceive the auxiliary verb. That is, the proportion of correctly perceived auxiliary verbs was greater when the target was manipulated to have a different speech rate from the context. When an auxiliary verb was deleted in the context, the participants reported recognizing, although the proportion of responses was very low for both the normal and fast speech rates. In the normal speech, the proportion was unchanged in terms of the goodness rating. However, another interesting finding was that in the fast speech rate, the recognition of auxiliary verbs increased when the goodness ratings were close to the poorest exemplar. This result is a counter example to the case of American English speakers. In the current study, the Korean participants learning English at a primary level were not accustomed to the rate of speech in American English. Based on the experiment results, this study implies that Korean students learning English should be taught in terms of ratedependent context so that they can perceive the function words with reduction or deletion in American English.

The Internal Structure of an Identification Function in Korean Lexical Pitch Accent in North Kyungsang Dialect

Kim, Jungsun 한국음성학회 2013 말소리와 음성과학 Vol.5 No.1

This paper investigated Korean prosody as it relates to graded internal structure in an identification function. Within Korean prosody, variants regarded as dialectal variations can appear as different prosodic scales, which contain the range of within-category variations. The current experiment was intended to show how the prosodic scale corresponding to the range of within-category differences relates to f0 contours for speakers of two Korean dialects, North Kyungsang and South Cholla. In an identification task, participants responded by selecting an item from two answer choices. The probability of choosing the correct response from the two choices was computed by a logistic regression analysis using intercepts and slopes. That is, the correct response between two choices was used to show a linear line with an s-shape presentation. In this paper, to investigate the graded internal structure of labeling, 25%, 50%, and 75% of predicted probability were assessed. Listeners from North Kyungsang showed progressive variations, whereas listeners from South Cholla revealed random patterns in the internal structure of the identification function. In this paper, the results were plotted using scatterplot graphs, applying the range of within-category variation and predicted probability obtained from the logistic regression analyses. The scatterplot graphs showed the different degree of the responses for f0 scales (i.e., variations within categories). The results demonstrate that the gradient structures of native pitch accent users become more progressive in response to f0 scales.