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Jeong-Eun Lee(이정은),Seung-Hyeon Song(송승현),Ji-U Ha(하지우),Hyo-Ri Kim(김효리),Chang-Soon Lee(이창순),In-Sik Cho(조인식) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
The elastic modulus and Poissons ratio have been measured by the tensile test with the attachment of gauge sensors. However, the simpler dynamic method has been developed by using the acoustic resonance frequency, which is much easier and more accurate than the conventional tensile test. The typical dynamic methods are (i) the Ultrasonic pulse echo method, (ii) the Resonance frequency method, and (iii) the Impulse Excitation Method. Although both the Ultrasonic echo method and the resonance frequency method have widely been used, the Impulse Excitation Method has come into the spotlight due to its simplicity and accuracy, which has also been prescribed in ASTM E1876. In this study, the practical control system has been implemented with the numerical analysis algorithm for the Impulse Excitation Method. With this technique, the dynamic elastic modulus and Poissons ratio have been measured and evaluated for structural materials such as Al7075-T6, STS304, STS420_J2, SCM440, STS630 and Ti6Al4V. Therefore, the reliability was verified through comparative evaluation of the results of the static test method and the dynamic test method for six structural materials.
Probing Electronic Structures of Melts and Glasses under Compression
Sung Keun Lee(이성근),Sun Young Park(박선영),Yoo Soo Yi(이유수),Eun Jeong Kim(김은정),Yong-Hyun Kim(김용현),Hyo-Im Khim(김효임),A Chim Lee(이아침),Saebom Ryu(류새봄),Hoon Khim(김훈),Kwan Young Mun(문관영),Juho Lhee(이주호) 한국암석학회 2020 한국암석학회 학술발표회 논문집 Vol.2020 No.8
찰옥수수 연구 : ⅩⅢ. 다수성 찰옥수수 "대덕찰 1호"의 주요 작물학적 특성 및 경제성 분석
이희봉(Hee-Bong Lee),이문섭(Moon-Sub Lee),복태규(Tae-Gyu Bok),최윤표(Yun-Pyo Choi),차희정(Hui-Jung Cha),홍범용(Bum-Yong Hong),김효기(Hyo-Gi Kim) 충남대학교 농업과학연구소 2011 농업과학연구 Vol.38 No.1
Daeduckchal 1 waxy corn hybrid including check was planted and compared with domestic leading vatiety on agronomic characteristics, traits related to table gualities and crude income. Stem and ear height of Daeduckchal 1 among used hybrids were intermediate and stem diameter was also similar to other hybrids. Days to tasseling of this hybrid needed 56 days which was slightly shorter than check hybrid, Yeonnong. Ear length of CNU-H2 was longer than Yeonnongchal as 21.7 ㎝, while Chalok 2 was 14.1 ㎝. Number of tillers per plant of this hybrid were higher than Chalok 2 but lower than Yeonnong. Pericarp thickness of CNU-H2 and CNU-H3 were similar to Yeonnon. In sugar content, Daeduckchal 1 was intermediate level as 11.7 brix(%). Marketability of Daeduckchal 1 was the highest among used hybrids and crude incomes was also high.