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김정태(Jeong-tae Kim) 어문연구학회 2006 어문연구 Vol.51 No.-
The vowel harmony is one of the phonological phenomena which is represented by connecting to similar series of vowels. In these days, this vowel harmony has remained as a type of fossilization in modern Korean. That is the "-아/어’ alternation, adverb conjunctive endings as a result of diachronic variation. This variation is regarded to diachronic vowel harmony and also is described as a kind of assimilation. However, Lee Byeong-geun(1976), Kim Ju-won(1999), Lee Mun-Gyu(2004) described that vowel harmony is not an assimilation in modern Korean any more. So this study assumed that there are positive and negative ending synchronically. That is, it is considered being fossilized as vowel harmony in diachronic phonology. For example, they have the formation like this: stem-final positive vowels of Korean verb "ㅏ, ㅗ + ending 아" and "negative vowels + ending 어". In fact, although /먹어/-〉*[머가] is not realized, /잡아/-〉[자버] is realized in modern Korean. That is, it has no variation in "negative vowels+negative vowels", but it has variation into "positive vowels+positive vowels" in "posive vowels+negative vowels". We intend to call this negative vowelization. The purpose of this paper is to propose that this negative vowelization could be one of characteristics in Chungnam dialect. We cannot see the negative vowelization in conjugation of "negative vowels+negative vowels". It shows us itself the realization of negative vowel forms in the formation like this: negative vowels + C]vst+어, such as "넘+어-〉[너머], 뜯+어-〉[뜨더]". The cases of ‘끄+어→[꺼], 서+어→[서], 가리+어→[개려]’ are under the circumstance of hiatus avoidance. There is no variation of negative vowel, only deletion and gliding are existed. In this paper, ‘아→어’ is negative vowelization. In "ending positive vowel + ending positive vowel" structure, "아’ changes to "어’. However, "가+아서→[가서], 빻+아→[빠:]’ is a deletion from hiatus avoidance phenomena. It turns out that hiatus avoidance is prior to negative vowelization. In case that final sound is a sonorant consonant as ‘갈+아→[가러], 말+아서→[마러서], 감+아→[가머], 많+아→[마너], 앓+았지→[아?찌]’, we can see negative vowelization like "아→어". At the same time, even in case that final sound is a obstruent like ‘옭+아서→[올거서], 솎+아서→[소꺼서], 맞+아→[마저], 쫓+아→[쪼처]’, vowelization is shown. This" 아-->어’ is very negative vowelization. Then, what is a mechanism of negative vowelization? Because bac k·low-vowel "/a/" is changed to back·middle-vowel "/?/", it could be named as a vowel rising in Korean vowel system. But, "아→어’ is not the Vowel rising in this case. According to Kim Jeong-tae(2003:57), vowel rising is a unconditional alternation which is not affected by adjacent sound. 아→어’ as a negative vowelization is a conditional alternation, because of stem positive vowel and word-final consonant, circumstance of ‘V+C+_____’. That is the reason we can say that ‘아→어’ negative vowelization is one of characteristics in Chungnam dialect, due to vowel rising of common pronunciation tendency in Korean. This paper analysed the only utterances of the old in rural area. Because generational and individual differences are existed in actual language use, negative vowelization is optionally applied to speakers of modern Korean.
김정태,김호정,조윤성,최수한,Kim, Jeong-Tae,Kim, Ho-Jeong,Jo, Yun-Seong,Choe, Su-Han 한국재료학회 1993 한국재료학회지 Vol.3 No.2
A procedure for preparing cross-sectional specimens for transmission electron microscopy(TEM)by focused ion beam(FIB)milling of specific regions of semiconductor devices is outlined. This technique enables TEM specimens to be pripared at precisely preselected area. In-situ #W thin film deposition on the top surface of desired site is complementally used to secure the TEM specimens to be less wedge shaped, which is main shortcoming of previous FIB-assisted TEM sample preparation technique. This technique is quite useful for the TEM sample priparation for fault finding and the characterization of fabrication process associated with submicron contact technologies.
부분방전 해석 방법으로 PSA(Pulse Sequence Analysis)의 현장 적용성에 대한 고찰
김정태,이호근,Kim, Jeong-Tae,Lee, Ho-Keun 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.5
Because of its effectiveness for the PD(Partial Discharge) pattern recognition, PSA(Pulse Sequence Analysis) has been considered as a new analytic method instead of conventional PRPDA(Phase Resolved Partial Discharge Analysis). However, it is generally thought that PSA has some possibility to misjudge patterns in case of data-missing resulting from poor sensitivity because it analyses the correlation between sequential pulses, which leads to hesitate to apply it to on-site. Therefore, in this paper, the problems of PSA such as data-missing and noise-adding cases were investigated. for the purpose, PD data obtained from various defects including noise-adding data were used and analyzed. As a result, it was shown that both cases could cause fatal errors in recognizing PD patterns. In case of the data missing, the error was dependant on the kinds of defect and the degree of degradation Also, it could be noticed that the error due to adding noises was larger than that due to some data missing.