Biomedical subjects

S A Jun

Publications and source records attributed to S A Jun.

4 recordsLinked to original sources

PubMed1992

Predictable ultrasonographic findings of early abortion.

Early fetal growth delay and early oligohydramnios have been suspected as signs of embryonal jeopardy. However, little information is available for the prediction of early abortion. Sonographic examination of 111 early pregnancies between the sixth and ninth gestational week with regular, 28 day menstrual cycles was performed to investigate predictable sonographic findings of early abortion. Sonographic measurements of the gestational sac (G-SAC), crown-rump length (CRL) and fetal heart rate (FHR) were performed using a linear array real time transducer with Doppler. All measurements of 17 early abortions were compared to those of 94 normal pregnancies to investigate the objective rules for the screening of early abortion. Most of the early aborted pregnancies were classified correctly by discriminant analysis with G-SAC and CRL (G-SAC = 0.5222 CRL + 14.6673 = 0.5 CRL + 15, sensitivity 76.5% specificity 96.8%). With the addition of FHR, 94.1% of early abortions could be predicted. In conclusion, sonographic findings of early intrauterine growth retardation, early oligohydromnios and bradycardia can be predictable signs for the poor prognosis of early pregnancies.

Abortion, Spontaneous↗

PubMed1991

Body stalk anomaly--a case report.

A case is presented of an amnionic rupture sequence which led to massive fetal ventral herniation and lordoscoliosis. Characteristic ultrasonographic findings of an omphalocele, fetal attachment to the placenta, and the absence of free-floating umbilical cord were observed.

Abnormalities, Multiple↗

PubMedDate not supplied

The interaction of coarticulation and prosody in sound change.

Ohala (1974, 1981a) has proposed that sound changes can originate in hearers' misinterpretations of synchronic phonetic patterns. This paper applies this idea to sound changes that are conditioned by the prosodic environment, such as the voicing of voiceless fricatives in unstressed syllables in Proto-Germanic. Browman and Goldstein's (1989, 1990) "gestural score" suggests a representation of synchronic patterns in which extreme overlap between gestures of neighboring phoneme segments in casual speech can produce the appearance of a feature change or a segment deletion. Many of the sound changes that are conditioned by prosodic environment can be viewed as a diachronic reinterpretation of just such synchronic fast-speech processes. For example, vowel reduction in unstressed syllables can be viewed as a reinterpretation of undershoot that occurs when the vowel is overlapped to a great extent by the oral gestures for neighboring consonants. Phonetic data are reviewed that support analogous accounts of stop spirantization, voiceless obstruent voicing, and even the insertion of an intrusive stop in clusters such as /ns/ in some prosodic environments.

Female↗

PubMedDate not supplied

A prosodic analysis of three types of Wh-phrases in Korean.

Wh-phrases in Korean are ambiguous due to the lexical ambiguity of "wh" words: wh-pronouns as in a wh-question, or indefinite pronouns as in a yes/no-question. Furthermore, since a wh-word in Korean is in-situ (i.e. not moved to the front of a sentence as in English), wh-questions are not distinguished from echo questions in their surface forms. In this paper, we investigated prosodic characteristics disambiguating these three types of wh-phrases: 1) wh-question, 2) yes/no-question, and 3) incredulity question, a kind of echo question giving an incredulity meaning. Production and perception data were examined to discover what prosodic features are used to distinguish these three types of wh-phrases and which feature is more salient and reliable in perceiving such differences. The production results show that yes/no-questions and other types of questions are distinguished by different accentual phrasing, while incredulity and wh-questions are distinguished by different peak amplitudes, pitch ranges, and boundary tones. Interestingly, not all speakers used the same strategy to distinguish incredulity from wh-questions. The results of the perception test suggest that accentual phrasing is significantly related to the perception of three types while amplitude and boundary tones are significantly related to the perception of wh- and incredulity questions, respectively.

Female↗