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Darveaux 모델에 의한 플립칩 패키지 솔더 접합부의 열피로 해석 및 수명 평가
신영의,김연성,김종민,최명기,Shin Young-Eui,Kim Yeon-Sung,Kim Jong-Min,Choi Myun-Gi 대한용접접합학회 2004 대한용접·접합학회지 Vol.22 No.6
Experimental and numerical approaches on the thermal fatigue for the solder joint of flip chip package are discussed. However, it is one of the most difficult problems to choose the proper fatigue model. It was found that viscoplstic FE model with Darveaux method was very desirable and useful to predict the thermal fatigue life of solder joint for flip chip package under $208{\~}423K$ thermal cycling condition such as steep slope of temperature(JEDEC standard condition C). Thermal fatigue life was 1075 cycles as a result of viscoplatic model. It was a good agreement compared to the experimental. And also, it was found from the experimental that probability of the thermal fatigue life was $60{\%}$ at 1500 cycles.
전자부품의 접합재료로서의 Sn도금막 형성 조건 및 도금막의 특성에 관한 연구
신영의,임민빈,김경섭,Shuji Nakata 한국전기전자재료학회 1993 電氣電子材料學會誌 Vol.6 No.6
본 논문은 전자 부품의 Soldring기에 사용되는 접합제를 Flux를 포함한 Solder paste 대신에 도금막을 이용하기 위한 Sn 도금막 형성 프로세스를 검토한 것이다. 반도체 Device를 Packaging한 외부단자(lead frame)과 HIC상의 후막전극(Ag/Pd)과의 접합 및 PCB상의 Cu land와의 접합시에는 스크린 프린트에 의한 Solder Paste가 일반적으로 사용되고 있다. 본 논문은 Fluxless Soldering의 한수단으로 도금막을 lead상에 형성시켜 접합 재료로서의 형성 프로세스 및 도금막의 특성과 도금형성 Paramete와의 관련성을 실험적으로 검토한 것으로 전류밀도 200 A/m$^{2}$의 조건으로 형성한 Sn 도금막이 접합용으로 최적조건임을 밝혔다.
구동사의 부사위치에 따른 음향음성학적 연구: 부사를 중심으로
임신영(Lim, Shinyoung),김은주(Kim, Eunjoo) 신영어영문학회 2021 신영어영문학 Vol.79 No.-
This study proposed uttering differences of adverbs according to the adverb placement among acoustic parameters, such as vowel duration, intensity, and F0 produced by 26 Korean speakers and 20 American speakers. This study mainly suggested four interesting findings: First, the duration and intensity of the vowels were strengthened when following the adverb to verb than following the adverb to nouns in both groups. Second, the vowel duration of adverbs in the final position of sentences was longer than in other types in both groups. Third, F0 of the vowel was strengthened when following the adverb of verbs than following the adverb of nouns produced by Korean speakers while American speakers relied more on the duration and intensity of vowels. Lastly, the closer the bond between the adverb and the verb, the more inverse the degree of reinforcement in the duration and intensity of the vowel.