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전자 개폐기용 바이메탈 소재(Fe-Ni / Fe-Ni-Mo)의 부식거동
안유정 ( Yu-jeong An ),황은혜 ( Eun-hye Hwang ),전재열 ( Jae-yeol Jeon ),김성진 ( Sung Jin Kim ) 한국부식방식학회 2023 Corrosion Science and Technology Vol.22 No.6
This study examined the corrosion behavior of bimetal materials composed of Fe-Ni alloy and Fe-Ni-Mo alloy, both suitable for use in electromagnetic switches. Electrochemical polarization and weight loss measurements revealed that, in contrast to Fe-Ni alloy, which exhibited pseudo-passivity behavior, Fe-Ni-Mo alloy had higher anodic current density, displaying only active dissolution and greater weight loss. This indicated a lower corrosion resistance in the Fe-Ni-Mo alloy. Equilibrium calculations for the phase fraction of precipitates suggested that the addition of 1 wt% Mo may lead to the formation of second-phase precipitates, such as Laves and M6C, in the γ matrix. These precipitates might degrade the homogeneity of the passive film formed on the surface, leading to localized attacks during the corrosion process. Therefore, considering the differences in corrosion kinetics between these bimetal materials, the early degradation caused by galvanic corrosion should be prevented by designing a new alloy, optimizing heat treatment, or implementing periodic in-service maintenance.
안유정(An, Yu Jeong),강한애(Kang, Han Ae),김봉태(Kim, Bong Tae) 한국해양수산개발원 2022 해양정책연구 Vol.37 No.1
This study analyzed the characteristics of each operational method of the tariff-rate quota (TRQ) system for fishery products, which has been widely introduced in Koreas free trade agreements (FTA). For this purpose, we examined the fill rate of quota, import characteristics, and the impact on import demand as well as its elasticity for major items such as shrimp, clam, and sole. According to the analysis results, the fill rate was low on a first-come-first-served basis, contrary to general expectations. Moreover, in the open competitive bidding method, the unit price of the quantity within the quota was significantly higher than that of the quantity outside the quota due to the importers pursuit of margins. In addition, it was found that the operation of the TRQ system affected an increase in shrimp imports and the elasticity of import demand, but no other cases were confirmed. These results can be used as a reference for Koreas additional FTA negotiations.
Bifenazate 저항성 점박이응애의 유전과 교차저항성
유정수,서동규,김은희,한종빈,안기수,김길하,Yu Jeong-Soo,Seo Dong-Kyu,Kim Eun-Hee,Han Jong-Been,Ahn Ki-Su,Kim Gil-Hah 한국응용곤충학회 2005 한국응용곤충학회지 Vol.44 No.2
2000년 12월 경북 칠곡의 장미재배지에서 채집한 점박이응애를 실험실에서 4년 동안 bifenizate로 150회 이상 도태하여 248.8배의 저항성계통을 얻었다. 이 저항성 계통의 유전과 9종 살비제에 대한 성충과 알의 교차저항성 유무를 조사하였다. 감수성계통 수컷과 저항성계통 암컷을 상호교배$(S{\times}R)$하여 얻은 $F_1$ 우성도는 성충과 알에 대해서 각각 0.48, 0.94로 불완전우성이었으며, $R{\times}S$ 으로 상호 교배하여 얻은 $F_1$ 우성도는 성충과 알에 대해서 각각 -0.85, -0.17로 불완전열성이었다. 이 저항성 점박이응애의 성충은 acequinocyl, fenpyroximate에 대해 각각 9.9, 5.0배의 교차저항성을 나타내었으며, emamectin benzoate, milbemectin에 대해서는 각각 0.14, 0.04배의 역상관교차저항성을 나타내었다. 알은 amitraz, emamectin benzoate, fenpyroximate, milbemectin, pyridaben, spirodiclofen에 대해 각각 22.0, 11.7, 32.3, 16.3, 394.8, 19.5배의 교차저항성을 나타내었으며, abamectin에 대해서는 0.01배의 역상관교차저항성을 나타내었다. The development of resistance to bifenazate (resistance ratio of egg=40.3 folds) was found in population of the twospotted spider mite, Tetranychus urticae, collected from rose greenhouses in Chilgok, Gyeongbuk Province in December 2000. This population was selected for 4 years with bifenazate treatment (over 150 times), and showed 248.8 folds increase in resistance as compared to susceptible (S) strain. Inheritance of bifenazate resistant strain (R) and cross resistance of this strain to 9 acaricides were investigated. There were differences of susceptibility in the bifenazate concentration-mortality relationships in F1 progenies obtained from reciprocal cross with the S and R strain $(R{\times}S,\;S{\times}R)$. Degrees of dominance were 0.48 and 0.94 in adult females and eggs of $R{\times}S$ and -0.85 and -0.17 in adult females and eggs of $S{\times}R$, respectively. Inheritance type in the F1 progeny of $R{\times}S$ was incomplete dominant, and F1 progeny of $S{\times}R$ was incomplete recessive. These results suggest that inheritance of bifenazate resistance is controlled by a complete dominance. The R strain exhibited cross resistance to acequinocyl and fenpyroximate in adult females, and amitraz, emamectin benzoate, fenpyroximate, milbemectin, pyridaben and spirodiclofen in eggs. However they showed negatively correlated cross-resistance to emamectin benzoate and milbemectin in adult females, and abamectin in eggs.
주문형 비디오 서버에서 비디오 데이터의 인기도에 따른 분산 배치 기법
안유정,원유헌,An, Yu-Jeong,Won, Yu-Heon 한국정보처리학회 2000 정보처리학회논문지 Vol.7 No.2
A retrieval performance of VOD sever is estimated by how quickly it services popular videos to users and how many users it is able to service. Each video data is placed on heterogeneous disks and placement techniques are various, retrieval performance is under the control of these elements, so that a retrieval performance is affected by placement policy. In this paper, we place video data considering their characteristics, especially, we place videos distributively according to their popularity. To verify our policy, we make various environment of experiment, estimate a placement policy using popularity of videos and a contrary policy, and compare them.