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월경주기에 따른 우울지수 정도와 음성특성과의 상관관계 분석
김유미(Kim, YuMi),장승진(Jang, Seoung-Jin),김은연(Kim, Eunyeon),최예린(Choi, Yaelin) 한국음성학회 2014 말소리와 음성과학 Vol.6 No.3
This study investigated the differences between emotional parameters BDI, VHI, STAI-X-Ⅰand STAI-X-II according to the menstrual cycles of the female and the relation between changes of the depression index and voice characteristics (jitter, shimmer, CPP, HNR, pF0·F1·F2·F3, sF0, sF4, sB1, H1c/u, A1u, A3c, H1A3c/u, H1A1u). Twenty three females (30 ± 4.4 years old) living in Seoul and Gyeonggi Province were participated in this study to answer the questionnaires and record their voice. The participants prolonged /a/ vowel for 5 seconds in a natural condition for their voice recording. Voice data were analyzed using the Matlab and Praat program. A t-test and a correlation analysis were conducted by using SPSS for the statistical analysis. The results are as follows. First, the BDI is significantly higher in group Ⅰ(lurear phase contrast the menstrual period) and group Ⅱ (follicular phase against the menstrual period) than group Ⅲ (luteal phase for follicular phase) (p<.05). Second, shimmer, CPP, pF0 showed a statistically high correlation regarding the BDI in group Ⅰ(lurear phase contrast the menstrual period). Voice parameters may be useful as supplement in evaluating the emotional change in the phase of menstrual cycle.
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청각장애 아동과 일반 아동의 마찰음에 나타난 음향음성학적 특성 비교
김윤하(Kim, YunHa),김은연(Kim, Eunyeon),장승진(Jang, Seoung-Jin),최예린(Choi, Yaelin) 한국음성학회 2014 말소리와 음성과학 Vol.6 No.2
Alveolar fricative sounds /s/ and /s"/ are learned last for normal children in the speech development process for Koreans. These are especially difficult to articulate for hearing-impaired children often causing articulation errors. The acoustic phonetic evaluation uses testing tools to provide indirect and object information. These objective resources can be compared with standardized resources on speech when interpreting the results of a test. However, most previous studies in Korea did not consider acoustic studies that used the spectrum moment values of hearing-impaired children. Therefore, this study was conducted to compare the characteristics of hearing-impaired children"s pronunciation of fricative sounds using spectrum moment values. For this purpose, the study selected a total of 10 hearing-impaired children (5 boys and 5 girls) currently in 3rd or 5th grade and attending one of the elementary schools in Seoul or Gyeonggi-do. For the selection process, their age, type of hearing aid, implantation of hearing aid (CI) before two years of age, hearing capacity (dB) before and after wearing the hearing aid, duration of speech rehabilitation, and time of learning alveolar fricative sounds were all considered. Also, 10 normal children (5 boys and 5 girls) were selected among 3rd or 5th grade students attending one of the elementary schools in Seoul or Gyeonggi-do. The subjects were asked to read the carrier sentence, "I say _______," including a list of 12 meaningless syllables composed of CV and VCV syllables, including alveolar fricative sounds /s/ and /s"/ and vowels /a/, /i/, and /u/. The recorded resources were processed through the Time-frequency Analysis Software Program to measure M1 (mean), M2 (variance), M3 (skewness), and M4 (kurtosis) of the fricative noise. No significant differences were found when comparing spectrum threshold values in the acoustic phonetic characteristics of hearing-impaired children and normal children in alveolar fricative sound pronunciation according to vowels /a/, /i/, and /u/, alveolar fricative sounds /s/ and /s"/, and syllable structure (CV, VCV) other than, for M3 in the comparison of groups according to disability. In the comparison of syllable structures, there were statistically significant differences in M1, M2, M3, and M4 with clinical significance. However, there was no significant difference in results when comparing the alveolar fricative sounds according to the vowels.
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김영록(Youngroc Kim),박성우(Sungwoo Park),김은연(Sunghwon Kim),김성환(Eunyeon kim),류영현(Yeonghyeon Ryu) 전력전자학회 2007 전력전자학술대회 논문집 Vol.- No.-
본 논문에서는 주택용 3㎾급 태양광발전 계통연계형 인버터에 대하여 설명한다. 기존에 생산된 승압형 DC-DC 컨버터를 추가한 인버터와 토폴로지는 같으나, 설치 장소의 제약을 받지 않도록 실외형 시스템으로 개선하였다. 또한, TMS320F2812, discrete IGBT등의 주요 소자를 채택하여 소형, 경량화 하였고, EMI 노이즈를 저감시켰다.
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10㎾급 태양광발전용 고주파링크 계통연계형 인버터의 개발
김영록(Youngroc Kim),나병훈(Byunghun Ra),김성환(Sunghwon Kim),손용훈(Younghoon Son),김은연(Eunyeon Kim) 전력전자학회 2007 전력전자학술대회 논문집 Vol.- No.-
국내의 태양광발전용 계통 연계형 삼상 인버터는 대부분 저주파(60㎐) 변압기를 사용하는 절연형 인버터이다. 이 인버터의 경우 무변압기 또는 고주파 변압기 인버터에 비해 회로 및 제어가 간단하다. 하지만 무게나 부피가 상당히 크고, 소형화 하기 어려운 단점이 있다. 무변압기형 인버터의 경우 저주파 절연형 인버터에 비해 무게나 부피가 작고, 소형화 할 수 있으나, 계통과의 전기적 절연이 되지 않는 단점이 있다. 본 논문에서는 이러한 문제점을 해결하기 위하여 태양광발전용 고주파링크 계통 연계형 삼상 인버터 시스템을 개발 하였다.
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백연숙(Baek Yeonsook),김세주(Kim Sejoo),김은연(Kim Eunyeon),최예린(Choi Yaelin) 한국음성학회 2012 말소리와 음성과학 Vol.4 No.1
The purposes of this paper is to study the characteristics of compared to the speakers voice without depression and speakers with depression, and to propose a objective method for the measurement of the therapeutic effects as well as for diagnostics of depression based on the characteristics. The voice samples obtained from 11 female speakers with depression, aged from 20 to 40, diagnosed as having major depressive disorder by an psychiatrist were compared with those from 12 normal controls with matched sex, age, height, weight, education, smoking, and drinking. The voice samples are taken by a portable digital recorder(TASCAM DR-07, Japan) and analysed using the MDVP(Multi-Dimentional Voice Program) software module from CSL(Computerized Speech Lab, kay elemetrics, co, model 4100). The result of the investigation are as following. First, the average speaking fundamental frequency and loudness range of the speakers with depression group was statistically significantly lower than that of the control group. The pitch range of the control group was rather higher than that of the speakers with depression group, but without statistical significance. Overall speech rates have no statistical difference between two groups. Second, the average speaking fundamental frequency and loudness range have statistically significant negative correlation with Beck Depression Inventory, i.e. more severe depression exhibits lower average speaking fundamental frequency and loudness range. Other vocal parameters such as pitch range and overall speech rate have no statistically meaningful correlations with Beck Depression Inventory.
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