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인공수로에서 산성화 영향에 따른 소백옆새우 ( Gammarus sobaegensis ) 의 생태독성학적 연구 - 표류행동을 중심으로 -
박정호(Jung Ho Park),조동현(Dong Hyun Cho),정근(Keun Chung) 한국환경생물학회 2000 환경생물 : 환경생물학회지 Vol.18 No.1
This study was carried out to examine the drift of Gammarus sobaegensis by acid stress as pH depression in Oweol creek from April 1996 to October 1996. The behavioral drifting was revealed to the characteristics of G. sobaegensis that is tend to increase as acid stress. And, tolerance level of G. sobaegensis to pH depression was different among the size classes. Individuals belong to small to medium size classes were weak in lower pH. Pattern of response in G. sobaegensis has a lower tolerance to acid stress at below pH 4.0 than above pH 5.0 in the artificial channel and show the possibility as an effective aquatic ecotoxicity test organism. The result of analysis of variance, water temperature(F-ratio=66.596, P<0.0005) and the size classes(F-ratio=71.386, P<0.0005) except pH level (F-ratio=353.415, P<0.0005) were showed to the major factor for drift behavior by acid depression. [Gammarus, pH, Drift, Acid stress, Ecotoxicity test].
Investigation on Relationship between Loaded Static Transmission Error and NVH of Helical Gear
Woo-Jin Chung(정우진),Ho-Gil Yoo(유호길),Jung-Ho Park(박정호),Dong-Joo Moon(문동주),Beom-Soo Kim(김범수),Young-Jun Park(박영준),이기훈 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
It is generally known that loaded static transmission error(LSTE) of a gear pair is directly related to noise and vibration(NV) of the gear system. For several decades, this has been theoretically investigated by analytical methods and validated by experimental methods. These original experiments used a gear pair whose involute profile was almost perfect and accuracy grade of ISO 1328 was higher than Quality 2. However, the validation tests with a master gear pair could not consider manufacturing errors. In this study, a helical gear pair with ISO Quality 5 was used to investigate the relationship between LSTE and NV. The results showed that the first harmonic of LSTE was significantly correlated to acceleration and sound pressure level of gearbox housing. It was invaluable to find out that LSTE of a gear pair without very high quality could be used as an NV indicator.