• Phonetics and Speech Sciences
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• v.8 no.4
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• pp.9-14
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• 2016

This study investigated the patterns of coda deletion in spontaneous Seoul Korean speech. More specifically, the current study focused on three factors in promoting coda deletion, namely, word position, consonant type, and morpheme type. The results revealed that, first, coda deletion frequently occurred when affixes were attached to the ends of words, rather than in affixes in word-internal positions or in roots. Second, alveolar consonants [n] and [l] in the coda positions of high-frequency affixes [nɨn] and [lɨl] were most likely to be deleted. Additionally, regarding affix reduction in the word-final position, all subjects seemed to depend on this articulatory strategy to a similar degree. In sum, the current study found that affixes without primary semantic content in spontaneous speech tend to undergo the process of reduction, favoring the occurrence of specific pronunciation variants.

• Journal of the Korean Society for Nondestructive Testing
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• v.34 no.6
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• pp.428-434
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• 2014

In this study, we examined the applicability of coda wave interferometry (CWI) technique, which was developed to characterize seismic waves, to detect and evaluate change in the velocity of ultrasonic waves in concrete due to acoustoelastic effect. Ultrasonic wave measurements and compressive loading tests were conducted on a concrete specimen. The measured wave signals were processed with CWI to detect and evaluate the relative velocity change with respect to the stress state of the specimen. A phase change due to the acoustoelastic effect of concrete was clearly detected in the late-arriving coda wave. This shows that the relative velocity change of ultrasonic waves in concrete due to the acoustoelastic effect can be evaluated successfully and precisely using CWI.

• Journal of the Earthquake Engineering Society of Korea
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• v.3 no.1
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• pp.67-74
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• 1999

In this study, coda Q has been determined by the single scattering model in the Kyeongsang Basin region using the decay of the amplitudes of coda waves on bandpass-filtered seismograms of local microearthquakes in the frequency range 1.5~18 Hz. Reported frequency dependence of Q is of the form $Q_C=Q_O^n$$(83.9{ll}Q_0{ll}155.9,;0.76{ll}n{ll}1.05$. Considering a model incorporating both scattering and intrinsic attenuation, and assuming that the attenuation is entirely due to the scattering loss, the minimum mean free paths are about 51~56 km and the coefficients of inelastic attenuation(${\gamma}$) are between 0.0093 and 0.0098 were found. Earthquake-station paths pass through the fault zone show high attenuation and strong frequency dependency compared to other ones.

• The Journal of the Korea Contents Association
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• v.6 no.1
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• pp.80-84
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• 2006

Motivated by the fact that cluster reduction strategies such as inserting a vowel or deleting a consonant in resolving English complex clusters differ depending on studies, this paper investigates the repair strategies employed by Korean EFL students. A total of 60 college students participated in the present study and the participants' production of English voiceless word-initial and word-final clusters was measured using the materials designed for this study. It has been shown that prosodic positions such as onset and coda and the number of cluster sequences influenced cluster reduction strategies. The error rates of both insertion and deletion were noticeably higher in the coda position than in the onset position and both insertion and deletion error rates were higher in triconsonatal cluster than in biconsonantal cluster sequences. Overall, the insertion rate was higher than the deletion rate. However, the deletion rate was significantly higher than the insertion rate in triconsonantal coda cluster sequences. Because of this, the deletion rate was higher than the insertion rate for triconsonantal cluster sequences across onset and coda. Also, the high deletion rate of triconsonantal coda clusters contributed to the high deletion rate for the coda clusters in general.

• Proceedings of the KSEEG Conference
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• 2007.04a
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• pp.95-95
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• 2007

See Full Text

• Proceedings of the KSPS conference
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• 1996.10a
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• pp.123-128
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• 1996

So far we have proposed the following constraint ranking for the (over-)application of the coda neutralization: (22) License family ≫ UE family ≫ IDENT-IO family ≫ Base-ID This analysis shows that only the surface level is enough to analyze the opaque behaviors of coda neutralization. Uniform Exponence constraint is worth further study since it can handle Consonant Cluster Simplification and underapplication of /t/-palatalization in Korean compounds in which morphemes before a stem are uniformly realized as one surface form: i.e., the output base form (S. Hong in preparation)(equation omitted)

• English Language & Literature Teaching
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• v.10 no.2
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• pp.67-87
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• 2004

The purpose of this paper is to show how the coda of a syllable and word-final clusters are represented in the English syllable structure. Previous theories on the syllable assume that there is only one segment in the coda position. And, as we know, the theories that license only one segment in the coda make it difficult to syllabicate the word-final cluster appropriately when more than two segments in the word-final cluster are encountered. I considered three approaches: the previous syllable structure (Selkirk, 1982; Borowsky 1989), sonority sequencing (Giegerich, 1992; Roca, 1999) and feature analysis (Goldsmith, 1990), But, all the considered methods don't give us a satisfactory explanation regarding word-final clusters. Finally, I will suggest a modified syllable representation as an alternative by placing two different appendixes under the Phonological Word which forms a constituent above the syllable node. From this it is possible to explain the former problematic word-final clusters including morphological information asan inflectional suffix in the structure.

• Phonetics and Speech Sciences
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• v.10 no.2
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• pp.45-50
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• 2018

The vowel/consonant ratio is a well-known cue for the voicing of postvocalic consonants. This study investigates how this ratio changes as a function of speaking rate. Seven speakers of North American English read sentences containing target monosyllabic words that contrasted in coda voicing at three different speaking rates. Duration measures were taken for the voice onset time (VOT) of the onset consonant, the vowel, and the coda. The results show that the durations of the onset VOT and vowel are longer before voiced codas, and that the durations of all segments increase monotonically as speaking rate decreases. Importantly, the vowel/consonant ratio, a primary acoustic cue for coda voicing, was found to pattern asymmetrically for voiced and voiceless codas; it increases for voiced codas but decreases for voiceless codas with the decrease in speaking rate. This finding suggests that there is no stable ratio in the duration of preconsonantal vowels that is maintained in different speaking styles.

• Proceedings of the Earthquake Engineering Society of Korea Conference
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• 1998.10a
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• pp.383-390
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• 1998

이 연구의 목적은 경상분지에 설치되어있는 지진계에 기록된 자료를 이용하여 coda Q값을 계산하고 그것이 어느 정도 주파수에 의존하는 가를 추정해 보는 것이다. 분석한 주파수 영역은 1.5Hz에서 18Hz까지이다. 자료는 3조로 나누어 처리하였으며, 단일 산란 이론을 적용하였다. 그리고 매질의 특성을 살펴보고자 minimum mean free path 와 비탄성 감쇠계수를 계산했다. 계산 결과는 Q0값이 83.85 ~155.88로 단층대를 지나는 경로를 가진 자료에서 비교적 낮은 Q 값이 결정 되었고 n은 0.7615~1.0466이다.

• The Bulletin of The Korean Astronomical Society
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• v.37 no.2
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• pp.218.1-218.1
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• 2012

2010년 7월부터 한국천문연구원과 일본국립천문대가 공동으로 운영하고 있는 한일상관센터(KJCC)에는 최대 16관측국, 최고 속도 8Gbps, 8192출력채널의 성능을 갖는 한일공동VLBI 상관기(KJJVC)가 설치되어 운용되고 있다. 상관결과는 각 출력 채널별로 관측데이터의 비지빌리티 정보만을 보유하고 있기 때문에, AIPS 등의 천문분석 프로그램에서 활용하기 위해서는 변환작업을 수행해야 한다. KJJVC는 일본국립천문대의 FX 상관기에서 활용하고 있는 CODA(Correlated Output Data Analysis) 파일 시스템을 도입하여, KJJVC의 상관결과 후처리에 적합하도록 수정하였다. 이 CODA 파일 시스템은 관측과 상관처리시 필요한 여러 가지 파라미터 정보를 정렬하고, 상관결과인 비지빌리티 정보를 각 채널별로 정렬하여 파일 시스템을 구축한 것이다. 본 발표에서는 KJJVC에서 개발한 CODA 파일 시스템과 AIPS 등에서 분석에 활용할 수 있는 FITS 형식으로 변환하는 소프트웨어의 개발과 성능에 대해 간략히 소개한다.