• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1998년도 하계종합학술대회논문집
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• pp.745-748
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• 1998

Recently, image and voice processing part is using wavelet transform. We propose thining algorithm using wavelet tranform. Wavelet transform consists of low frequency and high frequency in the spatial and frequency domain. After the wavelet decomposition, more than 90 percents of energy are contained in lowest frequency band. Therefor, for images with large difference of gray value between foreground and background like character images, we can more accurately in the lowest frequency band. Lowest frequency band has wavelet transform significant coefficient(WTS) that is required for the thinning algorithm we proposed Paper [3][5][7][8] can not separate consonants and vowels of korean characters. Becuase korean characters have structural feature. This paper can separate consonants and vowels. Simulation executed low frequency image and data compression can reduce 1/4$^{n}$ with level n. we can redcue time complexity 3/8.

• 음성과학
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• 제4권1호
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• pp.7-17
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• 1998

The purpose of this preliminary study on Korean vowel duration was to find how different syllable types and kinds of plosives influence vowel duration. The vowel duration of the Front Mid and Low vowels (/$\varepsilon$/(에), /e/(어), /${\ae}$/(애), /a/(아)) was found to be longer than that of High and Back vowels (/i/(이), /i/(으), /u/(우), /o/(오)). Compared with single vowels (V), Vowels followed by a consonant (CV) were shortened by 79.3% and vowels between consonants (CVC) were shortened by 38.5%, respectively. These results suggest that the influence of consonants upon Korean vowel duration depend on syllble types and the manner or place of articulation.

• 한국통신학회논문지
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• 제21권6호
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• pp.1379-1389
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• 1996

한글 필기는 항상 초성, 중성, 종성의 순으로 씌어진다. 본 논문은 이점을 이용하여 자소 탐색 모델을 설계하고 그 탐색 결과에 의거하여 글자를 인식하려는 온라인 필기 인식 방법을 제시하고자 한다. 기본 자소 모델은 은닉 마르코프 모델을 이용하고 자소 탐색 모델은 HMM의 망으로 구성한다. 자소 탐색은 Viterbi 알고리즘에 의한 정합으로 이루어지며 글자 인식은 이들 자소 가설 격자의 탐색으로 이루어진다. 인식 실험 결과는 간단한 인식기 구조에도 불구하고 정자체의 경우 87.47%에 달하는 상당한 인식률을 보였으며, 특히 자연스럽게 쓴 필기에서도 매우 훌륭한 자소 분할 결과를 얻을 수 있었다.

• 대한음성학회:학술대회논문집
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• 대한음성학회 2005년도 추계 학술대회 발표논문집
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• pp.91-95
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• 2005

The aim of this paper is to investigate the effects of postvocalic voicing(Contrasting voiceless fricative and affricate with voiced fricative and affricate) on vowel duration. In particular we focused on the durational differences between vowels followed by voiceless and voiced consonants across three groups of speakers: English speakers, English bilinguals and Korean learners of English. the result of experimental I showed that durations of vowels preceding voiced fricative and affricates as well as voiced stops are significantly longer than those preceding voiceless counterparts. Experiment Ⅱ indicated that as the subjects exposed themselves longer to English speaking society, their pronunciation was increasingly similar to those of English native speakers.

• 말소리와 음성과학
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• 제11권4호
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• pp.19-33
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• 2019

이 연구는 한국어 자음과 모음 대해 단기간의 지각 훈련을 받은 이집트인 학습자들이 학습 수준별로 어떠한 지각 개선 양상을 보이는지 조사하고, 각 음소 쌍의 학습용이성 정도를 파악해 이집트인 학습자들을 대상으로 하는 한국어 발음교육에 실질적인 기여를 하는 것을 목적으로 한다. 이를 위해 50명의 한국어 학습자를 대상으로 이집트 현지에서 고변이 음성 훈련을 실시하였다. 한국어 수준에 따라 학습자를 초급 집단과 중고급 집단으로 나누었고, 2주간에 걸쳐 각 집단에 대해 30~40분의 지각 훈련을 10회 진행하였다. 고변이 음성 훈련용 자료는 다수의 한국어 원어민 화자가 발화한 자연음이었으며, 최소대립 쌍을 이루는 단어와 문장으로 최대한 다양하게 구성하였다. 사전과 사후 테스트 비교 결과, 이집트인 초급과 중고급 집단의 한국어 모음과 초성에 대한 지각 능력이 뚜렷하게 향상된 것을 확인할 수 있었다. 종성에 대한 지각 능력 역시 향상되었지만 훈련 전부터 정확도가 높아 향상폭은 다소 낮게 나타났다. 각 음소에 대한 지각 정확도와 향상도를 바탕으로 음소 쌍별 학습용이성을 측정하고, 이집트인 학습자를 위한 학습용이성 위계를 학습 단계별로 설정하였다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1993년도 한국자동제어학술회의논문집(국제학술편); Seoul National University, Seoul; 20-22 Oct. 1993
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• pp.76-80
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• 1993

In this paper we discuss optimization of neural network parameters, such as inclination of the sigmoid function, the numbers of the input layer's units and the hidden layer's units, considering application to recognition of hand written Hangul. Hangul characters are composed of vowels and consonants, and basically classified to six patterns by their positions. Using these characteristics of Hangul, the pattern of a given character is determined by its peripheral distribution and the other features. After then, the vowels and the consonants are recognized by the optimized neural network. The constructed recognition system including a neural network is applied to non-learning Hangul written by some Korean people, which are the names randomly taken from Korean spiritual and cultural research institute.

• 한국음향학회지
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• 제8권5호
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• pp.70-77
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• 1989

본 연구는 한국어를 음소변로 분리하여 인식하는 실험에 관한 연구이다. 한국어 단음 545개를 자음 음소, 모음 음소, 받침 음소로 분리하여 선형 예측 계수로 인식한 결과, 각각 $87.3(\%), 91.0(\%), 91.7(\%)$의 인식률을 얻었고, 이 음소들을 결합한 단음에서는 $71.4(\%)$의 인식률을 얻었다. 음소 분리 및 음소 인식은 Itakura-Saito 거리 측정을 이용하였다.

• 영어어문교육
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• 제10권3호
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• pp.159-175
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• 2004

This paper investigated the types of errors on English pronunciation and intelligibility of Korean EFL students, and the relationship between the pronunciation accuracy and intelligibility. Thirty one students were evaluated by six English native speakers in terms of overall intelligibility and accuracy In five areas such as nuclear stress, word stress, syllable structure, consonants and vowels. According to the findings of the study, pronunciation errors were made by the subjects more frequently In word stress than any other area of pronunciation accuracy. The Pearson correlation analysis showed that intelligibility was related with word stress, syllable structure, consonants and vowels, and the stepwise multiple regression analysis indicated that, among the above five areas of pronunciation accuracy, word stress best accounted for the intelligibility of a given sentence. In the conclusion, the importance of teaching pronunciation of in those five areas with a special focus on word stress was emphasized m terms of intelligibility.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2017년도 춘계학술대회
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• pp.515-518
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• 2017

생체인식기술을 보안에 활용하기 위해 주성분분석을 활용한다. 손의 모양과 동작의 구분을 확인하기 위해 ㄱ부터 ㅎ까지의 수화동작을 촬영한다. 총 스무 명의 성인 남성이 실험에 참여했으며, 각 자음 당 10회씩 촬영을 진행하여 1인당 140장, 총 2800장의 사진을 통해 데이터베이스를 확보하였다. 이를 통해 얻은 데이터베이스에 MATLAB을 이용하여 이미지의 차원을 줄여주는 주성분분석(PCA)과 주요인분석법(LDA)을 적용하여 분석하고, 그 정확도와 신뢰도를 확인하기 위해 동일오류율(EER)을 이용한다.

• 대한후두음성언어의학회지
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• 제8권2호
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• pp.217-224
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• 1997

The present study was performed to investigate the voice onset time(VOT) of Korean stop consonants as the expanded research of Pyo and Choi(1996) : the intensity, and the air flow rate of Korean stops as the preliminary study f3r the classical singing training. Nine Korean stops(/P, P', $P^{h}$/, /t, t', $t^{h}$/, /k, k', $k^{h}$/) and a vowel /a/ were used as speech materials. CV and VCV syllable patterns were used for VOT measurement, and CV pattern was used for intensity and air flow rate measurement. Five males and five females pronounced the speech tasks with comfortable pitch and intensity : VOT, intensity, and air flow rate were measured. As results, the prevocalic stop consonants showed bilabials, the shortest VOT and velars, the longest one, except the unaspirated stops which showed the shortest was velar /k'/, and the alveolar /t'/ was the longest. Considering the tensity, heavily aspirated stops showed the longest, and the unaspirated, the shortest. Also the intervocalic stops showed similar results with the prevocalic stops, except the slightly aspirated stops which showed alveolar sound was the longest, and the bilabials, which showed the shortest was the slightly aspirated /p/, unlike the prevocalic stops, the unaspirated /p'/ the shortest. All of prevocalic stops showed the highest air flow rate in heavily aspirated stops, the second, thee slightly aspirated ones, and the lowest was the unaspirated stops. And as a whole, bilabials were the highest, and velars, the lowest, except in the heavily aspirated stops, which was the alveolar sound, the lowest. In the dimension of intensity, the unaspirated and bilabials were the highest, and the heavily aspirated and velars were e lowest, except the slightly aspirated stops, which were the bilabials the lowest, and the alveolars the highest.