The Development of Velocity Ripple Controller Using Active Phase Compensation

강석일(Seok Il Kang),정재현(Jae Hyeon Jeong),김정한(Jung Han Kim) Korean Society for Precision Engineering 2017 한국정밀공학회지 Vol.34 No.4

다양한 수준의 한국인 영어 학습자의 영어 파열음의 구간 신호 지각 연구

강석한,박한상,Kang Seok-han,Park Hansang 대한음성학회 2005 말소리 Vol.56 No.-

This study explores the most important temporal cues in the perception of the voiced/voiceless distinction of English plosives in terms of newly defined measures of perception: original signal to response agreement, unit signal to response agreement, and robustness. Seven native speakers of English and three leveled groups of Korean English learners participated in the present study. The results showed that both native speakers of English and Korean groups failed to successfully perceive the voiced/voiceless distinction of English plosives, particularly alveolar plosives, in word-medial trochaic positions. The results also showed that in word-initial and word-medial iambic positions both native speakers of English and Korean groups employ the information in the release burst and aspiration in the perception of the voiced/voiceless distinction, of English plosives, and that in word-final positions native speakers of English employ the information in the preceding vowel, while Korean groups employ the information in the closure interval.

외국어로서의 한국어 발음과 유창성 연구

강석한 ( Kang Seok-han ),안현기 ( Ahn Hyunkee ),홍은실 ( Hong Eun-sil ),민병곤 ( Min Byeong-gon ),조수진 ( Cho Su-jin ),이성준 ( Lee Sung-jun ),박현정 ( Park Hyun-jeong ) 이중언어학회 2017 이중언어학 Vol.67 No.-

The study investigated what variables affected more on Korean raters` production and fluency judgement to the Korean speakings of the advanced foreign learners. Nine professional Korean raters assessed sixty Korean learners` oral performance. The results are as follows: (1) fluency judgement for the Korean speaking follows the cross-linguistic trends, (2) the principal variables in judging L2 fluency include speech rate, F0 range, and pause frequency, (3) mean length of runs (number of syllables) - representing how many words the subjects express within the given time - comparatively lower effect in judging the fluency. The study also found that the wide range of F0 causes the higher scores of the fluency marks. The result could support the evidence that F0 - exerting how the subjects express the active intonation - is one of the important production and fluency cues, regardless of the spectrum structure of the target language. The result implies that Korean speaking education should focus more on the active intonation. (Konkuk University, Seoul National University, Sungkyunkwan University, Seoul National University, Seogang University, Seoul National University, Seoul National University)

교체형 유음 중첩어 및 대칭형 도움 중첩어의 인지 및 발화 요소 연구

강석한(Seok-han, Kang) 어문연구학회 2009 어문연구 Vol.60 No.-

Alternative reduplication achieves the semantic emphasis through asymmetrical coordination between the base and the reduplicant based on the maximum difference of F1 in vowels, or syllable duration in consonaants. These asymmentrical distribution of acoustical cues causes the perceptual enhancement in the alternative reduplicaiton. On the other hand . C-C symmetrical reduplication gains the goal through overgeneralization, in which the first symmetrical reduplication gains the goal through overgeneralization, in which the phoneme in the first syllable of the reduplicant copies back to the first syllable of the base. Generally , alternative reduplication of '⌀-C symmetry' formation gets the emphatic formation using the perceptual prominence to C-C symmetry formation. This overgeneralization is controlled by phonological and analogical conditions. While the vowel alternative reduplication changes into C-C symmetrical form, both consonantal alternatives with deletion and syllable alternative reduplication cannot be changed into C-C symmetrical forms. The similar reason could be applied to the consonantal alternatives with deletion and syllable alternative reduplication cannot be changed into C-C symmetrical forms. The similar reason could be applied to the consonantal alternatives with addition, in which 'p' and 't' occurring in the onset of the base form could be prohibited to change into symmetrical reduplication. In summary, the pure reduplication which repeats the base improves the semantic emphatic through non-morphological motivation : perceptual and production effects.

The Evaluation of L2 Pronunciation by the Raters` Language Background

강석한 ( Seok Han Kang ) 대한언어학회 2013 언어학 Vol.21 No.4

Evaluating L2 fluent pronunciation causes some problems for L2 teachers because of its subjectivity in evaluation. This paper is trying to suggest an educational implication for nonnative English pronunciation teaching. A speaking test is designed and administered to Korean undergraduates to determine which measured cues raters of natives and nonnatives associate with their rating patterns of L2 English proficiency. Fourteen raters (7 natives, 7 nonnative) are recruited to rate 30 participants. The results clearly show that the measured parameters such as pitch range, speech rate, and pause duration cues produced by Korean English learners are evaluated differently from raters’ language background. This paper argues for the need to import the parameter values fitted for the objective evaluation of L2 English pronunciation.

언어별, 연령별, 수준별 집단에 의한 모음간 영어 파열음 유/무성 인지 연구

강석한,Kang, Seok-Han 한국음성학회 2006 음성과학 Vol.13 No.2

In order to understand the various groups' perceptual pattern in both VCV trochee and iambus, this study examined the identification correctness and cue robustness for the unit intervals in light of background language, age, and English listening ability. The 4 groups of Native Speakers of English, Korean College Students of High Listening Achievement, Korean College Students of Low Listening Achievement, and Korean Elementary Students took part in the experiments. Tokens of $/d{\ae}per,\;d{\ae}per,\;d{\ae}per,\;d{\ae}per,\;d{\ae}per,\;d{\ae}per$ in trochee and of $/{\eth}{\partial}\;p{\ae}d,\;{\eth}{\partial}\;b{\ae}d,\;{\eth}{\partial}\;t{\ae}d,\;{\eth}{\partial}\;d{\ae}d,\;{\eth}{\partial}\;k{\ae}d,\;{\eth}{\partial}\;g{\ae}d/$ in iambus were extracted and modified into experimental signals composed of two digits(voiced-1, voiceless-0) by following the temporal intervals, in which the signals consisted of preceding vowel, closure, VOT, and post-vowel. In the first experiment of identification correctness in VCV iambus environment, all groups showed almost 100% correctness rate, while in trochee environment all groups were different(native speaker 87%, college high 74%, college low 70%, elementary 65%). In the second experiment of cue robustness, all groups showed the similar perceptual pattern in both environments. There was the order of robustness cues in VCV trochee: pre-vowel ${\gg}$ closure ${\gg}$ VOT ${\gg}$ post-vowel, while the order in VCV iambus: VOT ${\gg}$ post-vowel ${\gg}$ closure ${\gg}$ pre-vowel. In some condition, however, we found moderately different perceptual pattern depending on language, age and listening level.

영어파열음 시구간신호의 음향과 지각 비대칭성 연구

강석한,Kang Seok-Han 대한음성학회 2005 말소리 Vol.55 No.-

This study tests the hypothesis that the voiced-voiceless distinction is influenced by the relationship between acoustics and perception. Production and perception tests are conducted with temporal cues in different environments(CV, VCV, VC). The result showed that acoustic cues indicating significant difference between voiceless/voiced plosives do not behave just as do in perception. The result also showed that there existed an asymmetry between acoustics and perception.

PDP 구동 응용을 위한 저전압 스위칭 소자로 구성된 간단한 구조의 Multi-level 유지방전 회로

강순은(Soon-Eun Kang),남원석(Won-Seok Nam),한상규(Sang-Kyu Han),홍성수(Sung-Soo Hong),사공석진(Suk-Jin Sakong),양학철(Hak-Chul Yang),노정욱(Chung-Wook Roh) 전력전자학회 2006 전력전자학술대회 논문집 Vol.- No.-

본 논문에서는 PDP 구동 응용을 위한 간단한 구조의 Multi-level 유지 방전 회로를 제안한다. 제안된 회로는 기존의 Multi-level 유지 방전 회로에 비해 적은 수의 스위칭 소자로 구현할 수 있어 간단한 구조를 가진다. 또한, 기존의 Multi-level 회로와 동일한 수준의 소자 전압 및 전류 스트레스를 가지므로, 저가의 고성능의 저전압 소자를 사용할 수 있어 PDP 구동 회로의 원가 저감과 고효율 동작을 이룰 수 있을 것으로 예상한다. 제안된 회로의 동작 원리를 설명하고, 42" HD급 PDP에 실제 적용 실험을 하여 제안된 회로의 우수성을 보인다.

get과 take의 의미 비교 분석

강석한(Seok-Han Kang) 미래영어영문학회 2001 영어영문학 Vol.- No.8

제주 방언 단음절 명사의 음성학적 액센트 유형과 중세 국어 성조와의 관계

강석한 ( Seok Han Kang ) 영주어문학회 2011 영주어문 Vol.22 No.-

The current Jeju dialect holds the tone patterns of Middle Korean monosyllabic nouns phonetically. High tone, low tone, and rising tone of Middle Korean have been changed into low pattern, high pattern, and low pattern of Jeju accent. In this respect, the tone change goes along with Kyungsang dialect of Korea. But the change doesnot imply the phonological distinctive features, but the phonetic cues. The tone patterns have some influences on vowel duration and duration to the highest F0 peak. In other words, monosyllabic nouns with the rising MK tones represent the longest duration, while the low tones show the shortest duration. This means that the phonological tone patterns change into the phonetic accent. In this way, we can find some weak relationship between Jeju Korean and Middle Korean.