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        • KCI등재

          Co / NiMn의 교환 자기결합에 관한 연구

          안동환(DongHwan Ahn),조권구(Kwon-Koo Cho),주승기(Seung-Ki Joo) 한국자기학회 2000 韓國磁氣學會誌 Vol.10 No.4

          RF 마그네트론 스퍼터링 증착법으로 제작한 Co/NiMn 이층막에서의 교환자기결합현상을 연구하였다. 어닐링의 온도와 시간에 따른 교환자기결합력(Hex)의 변화를 조사하여 300℃에서 13시간의 열처리후에 최대의 교환결합자장을 얻을 수 있음을 보였고, NiMn과 Co층의 적층순서를 변화시켰을 때, NiMn 상층구조의 시편이 더 높은 교환자기결합력을 나타냄을 알 수 있었다. 상층의 Ta 보호막의 사용이 교환자기결합을 나타내는데 필수적임을 알 수 있었는데, AES 분석은 Ta보호층을 적용하지 않은 경우에, 산소원자가 막 내부의 깊은 곳까지 침투함으로 인하여 교환자기결합력이 일어나지 않음을 보여주었다. 또한 교환자기결합에 대한 Ta 바닥층의 효과를 연구하였다. Ta 바닥층은 높은 교환자기결합력을 얻기 위해서는 사용하지 않는 것이 낫다는 것을 알아내었다. X선 회절분석의 결과는, Ta바닥층이 다층막에 우선방위조직을 형성시키는데 기여하지만, NiFe/NiMn 이층막에서의 경우와는 달리 교환자기결합에 반드시 필요한 조건이 아님을 보여주었다. 또한 Co층과 NiMn층의 두께에 따른 교환결합력의 영향을 조사하여, 교환결합력은 200 Å이상의 NiMn층 적용 시 최대값을 가지며, Co층의 두께에 반비례함을 알 수 있었다. Exchange coupling of Co/NiMn bilayers fabricated by RF magnetron sputtering method was studied. We investigated the variation of exchange coupling field (Hex) for different annealing temperature and time. The maximum exchange coupling field was obtained after 13hr annealing at 300℃. With respect to deposition sequence, it was demonstrated that NiMn-top bilayers had higher exchange coupling field than NiMn-bottom bilayers. Ta capping layer was shown to be essential in achieving exchange coupling and Auger Electron Spectroscopy (AES) proved that uncapped NiMn/Co bilayers did not have exchange coupling because of oxygen incorporation into film. We also observed the effect of Ta underlayer on exchange coupling. It was found that Ta underlayer had better not be used for attaining higher exchange coupling. XRD analysis showed that Ta underlayer helped bilayers develop texture, but it was not essential to exchange coupling of Co/NiMn bilayers, which is in contrast to NiFe/NiMn system. Furthermore, the NiMn and Co thickness dependence of exchange coupling has been investigated. The exchange coupling strength reached the maximum above 200 Å NiMn thickness and had inversely proportional relation with Co thickness.

        • 차량 실내 소음 주파수 특성 변경이 운전성 평가에 미치는 영향

          안동환(Donghwan Ahn),이동현(Donghyun Lee),김영관(Younggwan Kim),위효성(Hyoseong Wi),이진우(Jinwoo Lee),박진일(Jinil Park),이종화(Jonghwa Lee),김범수(Beomsoo Kim),이석재(Seogjae Lee) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11

          Vehicle performance is improving day by day. So drivers want to higher quality of drivability, which include acceleration performance, interior noise, vibrations and etc. In particular, the vehicle interior noise which is a major factor in the evaluation drivability is important factor. In this study, According to the frequency of vehicle interior noise, vehicle interior noise were analyzed which based on sound pressure level. On the basis of this analysis, the interior noise was changed through sound equipment, such as a microphone and equalizer. This interior noise was evaluated by drivers and identified a correlation between subject’s responses and changing of the frequency. As a result of this research, frequency bands and sound pressure levels which affect evaluation drivability were presented to meet the needs of consumers about acceleration, noise and vibration.

        • 후륜 구동 A/T 차량의 구동축 강성이 발진 가속에 미치는 영향

          안동환(Donghwan Ahn),위효성(Hyoseong Wi),박진일(Jinil Park),이종화(Jonghwa Lee) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11

          Drivers are requiring higher drivability as the quality of life rises and the performance of the vehicle improves. Especially, drive shaft stiffness is closely related to drivability influential factors of a vehicle such as responsiveness, acceleration, and quietness. In order to make good drivability, powertrain of vehicle must generate driving force that corresponds to acceleration performance requested by the driver. In this paper, vehicle acceleration characteristics - one of the most important factor of drivability - are analyzed according to the drive shaft stiffness. In order to predict vehicle acceleration characteristics, a model to analyze the torque flow of an actual vehicle and a model coefficient measurement methodology are required, contribution of each component in the power distribution process must be understood, and a corresponding simulation model must be established. And based on the simulation result of this research, initial vehicle acceleration characteristics depending on driveshaft stiffness was predicted.

        • KCI등재

          농촌 과소화마을의 변화 분석

          박진우,이태호,안동환,Park, Jen-Woo,Lee, Taeho,An, Donghwan 한국농촌계획학회 2018 농촌계획 Vol.24 No.2

          The main purpose of this study is to explore the factors that affect the transformation of over-depopulated rural villages. Specifically, we investigated the reasons of the rapid decrease in the number of over-populated rural villages shown by recent census data in spite of the continuing decrease of population in rural area. We used a binary-logit model and the Census of Agriculture, Forestry and Fisheries data(2010, 2015). The main results are summarized as followed: First, the over-depopulated rural villages with strong agronomic base are more likely to exit from over-depopulation. Second, returners from urban to rural have a positive impacts on the revival of over-depopulated rural areas. Thirds, improving the basic services accessibility of rural residents is also critical for keeping rural community more sustainable. These findings can be used to make effective strategies to revive the depopulated rural villages.

        • KCI등재

          신선육과 가공육으로 분리된 육류의 수요체계 분석

          박시현(Sihyun Park),안동환(Donghwan An) 한국농식품정책학회 2020 농업경영정책연구 Vol.47 No.2

          '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

          This study aims to analyze the demand system of Korean meat products with which we can take into account fresh meat and processed meat separately by using a non-linear Almost Ideal Demand System (AIDS) model. The results show that individual characteristics, seasonality, and livestock disease outbreak have different effects on the demand for fresh meat and processed meat. Elderly people seem to consume more fresh meat rather than processed meat and there is also seasonal variation in processed meat consumption. The outbreak of HPAI has negative impacts on the consumption of fresh chicken, while the expenditure share of processed chicken increased after the outbreak. Finally, the cross-price elasticity estimates show a complementary relationship between processed beef and processed chicken. The domestic fresh beef demand is estimated to be elastic with respect to the price of fresh pork, while the demand for processed pork is elastic with respect to the price of domestic fresh beef price.

        • KCI등재

          농가의 리스크 밸런싱 행위 분석

          추성민(Sungmin Cheu),안동환(Donghwan An) 한국농업경제학회 2018 農業經濟硏究 Vol.59 No.3

          '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

          This study examines farm households’ risk balancing behavior in Korea. We use a SUR (seemingly unrelated regression) model to reflect the interdependence in farm households’ risk balancing behavior where they adjust their financial structure, off-farm work decisions, and consumption level, etc. We find that Korean farm households make strategic farm financial risk decisions, off-farm business decisions, and consumption adjustment in response to exogenous changes in expected farm risk or business risk. This study also shows that large farms make more use of off-farm risk balancing, while small farms appear to make more use of financial risk balancing and adjusting consumption level.

        • KCI등재

          수입 밀 가격의 밀가루 및 라면에 대한 비대칭적 가격전이 효과 분석

          우성휘(Woo, Sunghwi),안동환(An, Donghwan),김관수(Kim, Kwansoo) 한국농업경제학회 2017 農業經濟硏究 Vol.58 No.4

          '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

          This study examines the effects of imported wheat on price of flour and ramen with a focus on asymmetric price transmission. The rise in price of imported wheat affects the change in domestic wholesale price of flour after a considerable period of time. And the effects of flour’s wholesale prices on retail prices differ slightly depending on distribution channels. In particular, asymmetric price transmission is relatively clear in distribution channels which have large sales, compared to small distribution channels. The above results show that the cause of asymmetric price transmission may be the difference of the distribution process of products. On the other hand, fluctuations in prices of raw materials, including flour, did not affect the wholesale price of ramen. This seems to be because the share of raw materials in the production cost of ramen is lower than that of flour, and ramen is the subject of government s price control.

        • KCI등재

          북한 대중예술 및 미디어 보도의 표현분석을 통한 협동 농장 정책 연구: 분조의 주인과 로동신문을 중심으로

          임채환 ( Lim Chehwan ),안동환 ( An Donghwan ) 북한연구학회 2020 北韓硏究學會報 Vol.24 No.2

          2000년대 이후 북한은 경제난을 타개하기 위하여 여러 경제 개혁 조치를 시행하고 있으며, 농업 분야에서도 각종 농업정책이 도입되고 있다. 그러나 북한은 여전히 세계 최빈국 수준이며, 식량 증산에 실패하여 만성적 결핍 상태가 지속되고 있다. 본 연구는 북한의 대중예술(영화 분조의 주인)과 미디어 보도(로동신문)를 활용하여 북한 당국이 선전하는 농업 정책과 실질적인 성과를 미시적 단위(협동농장)에서 살펴본다. 통계와 수치자료에 기반하지 않은 정성적 분석 방법은 연구의 한계이지만, 동시에 북한의 정량적 자료가 제약된 상황 하에서 북한의 농정(협동농장) 실태를 조망하고, 변화를 추적하기 위하여 시도된 노력이라고 평가할 수 있다. 분석 결과, 영화에 반영된 과거(2012년)와 로동신문에 나타난 최근(2015~2020년) 동안 협동농장 운영에 관한 표현은 유사성이 매우 높았다. 북한 당국은 여전히 식량 증산의 절박성과 시급성을 다양한 수사로 강조하고 있었으며, 농업정책 또한 농장 구성원을 사상적으로 교양시켜 신실한 근로자로 만들며 주요 농업 투입재로 후민산 비료의 도입과 적절한 사용을 강조하고 있었다. 협동농장 운영 정책이 유의미하게 변화하지 않았다는 것은 북한 농업 개혁의 실패의 주요 원인 가운데 하나로 작용되었을 것으로 판단된다. Since the 2000s, North Korea has implemented various economic reform measures to overcome its economic difficulties, and various agricultural policies have been introduced in the agricultural sector. However, North Korea is still the poorest country in the world, and its failure to increase food production has led to chronic shortages. This study uses North Korea’s popular arts (the owner of the movie division) and media coverage (Rodong Sinmun) to examine the agricultural policies and practical achievements promoted by the North Korean authorities in micro-unit (cooperative farm) and suggest the cause of the failure of the agricultural administration. While qualitative analysis methods, which are not based on statistics and numerical data, are the limitations of research, at the same time, it can be evaluated as a new effort that has been attempted to view changes and actual conditions in North Korea’s agricultural administration under circumstances where quantitative data in the North is restricted. According to the analysis, the terms used in the Rodong Sinmun to describe how cooperative farms operate in 2012 and in the period between 2015 and 2020 were very similar. The North Korean authorities were still emphasizing the urgency of increasing food production through various investigations, and the agricultural policy was also emphasizing the introduction and proper use of the Fumic fertilizer as a major agricultural input, by enhancing the knowledge of farm workers and making them more devoted to their work . The fact that the policy of operating cooperative farms has not changed significantly is believed to have served as one of the main reasons for the failure of North Korea’s agricultural reform.

        • KCI등재

          농가의 정보접근성이 농가판매액에 미치는 영향 분석

          김민경 ( Minkyung Kim ),안동환 ( Donghwan An ) 한국농업경제학회 2017 農業經濟硏究 Vol.58 No.1

          '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

          The purpose of this study is to examine the determinants of farmers` participation in informatization activities and the effects of information accessibility on the farm sales earning. This paper considers three variables to capture farmers` accessibility to information; if a farmer uses computer or not; if the farmer belongs to the village carrying out an Information Network Village Program; and if the farmer participates in any farmers` organization including producers` organization. A two-stage model is applied to avoid any endogeneity problem related with information accessibility and farm sales. We found that education level, participating in non-farming activities such as tourism or marketing related activities, the level of regional information infrastructure, and participating in farmers organizations have some positive impacts on the information accessibility of farmers. Furthermore, the enhanced accessibility to information is likely to increase the farm sales earnings, while the effectiveness of information on farm sales earnings seems to decline as the size of farm sales earnings increases.

        • 무단변속기에 의한 FTP-75 모드 연비 기여도 및 개선효과 분석

          김현우(Hyeonwoo Kim),안동환(Donghwan Ahn),고현상(Hyeonsang Ko),박진일(Jinil Park),이종화(Jonghwa Lee) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11

          A study of AT(auto-transmission) is continuing to improve the fuel economy and powertrain performance with multistage technology in a lot of car companies. But an AT has a problem with stage limit. So a research of CVT(continuously variable transmission) which can drive on the ideal driving condition is going on until nowadays. Further more among these researches, an fuel economy improvement effect analysis is needed when an AT is replaced a CVT, Although a lot of time and money is required in this study simulation can reduce them. In this paper, we analyzed the fuel economy improvement effect when CVT installed on a gasoline vehicle instead of an AT. For this study, we took a FTP-75 mode on chassis dynamometer and analyzed the energy flow down in the CVT vehicle. And we composed modeling and did the simulation by AVL CRUISE based on the results of CVT vehicle analysis data. As a results, it could be accomplished 7.5% improvement of fuel economy when CVT replaced an AT.

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