The Implementation of Speed Control on IPMSM using Simple Nonlinear Adaptive Back-Stepping

JeonYong-Ho,ShinWon Lee 보안공학연구지원센터 2014 International Journal of Control and Automation Vol.7 No.5

New structure of ferromagnetic Fe₁-xMnx thin films on GaAs(100) using molecular beam epitaxy

Sungyoul Choi,Jeonyong Choi,Soon Cheol Hong,Sunglae Cho,Yongsup Park,Lee Kyu Won,Hyun-Min Park 한국자기학회 2004 한국자기학회 학술연구발표회 논문개요집 Vol.14 No.2

농업용 저수지 제방에서 토목섬유 블랭킷의 길이에 따른 감압정의 성능 평가

유전용,김승욱,장용채,Ryu, Jeonyong,Kim, Seungwook,Chang, Yongchai 한국지반환경공학회 2022 한국지반환경공학회논문집 Vol.23 No.6

The performance of the relief wells installed for the purpose of controlling seepage of the dam embankment is affected by various parameters such as diameter, spacing, penetration rate, permeability coefficient of the ground, thickness of the foundation layer. Therefore, when the relief wells are adopted for the purpose of reducing seepage pressure, these parameters should be sufficiently reviewed to determine the installation specifications of the relief wells. This study evaluated the effect of the length of the geosynthetics blanket on the performance of the relief wells installed in the downstream part of the dam embankment with blankets in the upstream and downstream part of the dam embankment as countermeasure methods to control seepage of the dam embankment. In the relationship between the length of the upstream and downstream blanket and the discharge, the discharge of the relief wells decreases as the length of the upstream blanket increases, and on the other hand, the discharge of the relief wells decreases as the length of the downstream blanket increases. In the upper and lower blanket length-spacing relationship, as the length of the upstream blanket increases, the spacing of the relief wells increases and as the length of the downstream blanket increases, the spacing of the relief wells decreases. Therefore, when installing the relief wells in parallel with the blanket, it was found that increasing the length of the upstream blanket is more efficient than increasing the length of the downstream blanket in order to minimize the discharge of seepage discharge and to ensure economic feasibility by wider installation of the relief wells.

스크린 스포츠 활성화를 위한 가격마케팅전략

최의열(ChoiEui-yul),전용배(JeonYong-bae),이경민(LeeKyongmin) 한국체육학회 2018 한국체육학회지 Vol.57 No.1

이 연구는 스크린 스포츠 테마파크 이용자들의 가격마케팅전략이 재방문의도 및 타인추천의도에 미치는 영향을 분석하기 위해 수행되었다. 이러한 연구목적을 달성하기 위해 수도권 지역에 위치한 스크린 스포츠 테마파크 매장에서 설문조사를 실시하여 253명의 유효표본을 확보하였다. 자료의 타당도와 신뢰도 검증을 거쳐 다중회귀분석을 통해 다음과 같은 결론을 도출하였다. 첫째, 가격마케팅전략의 하위 요인 중에서 상품전략은 스크린 스포츠 테마파크 이용자들의 재방문의도 및 타인추천의도에 유의한 영향을 미치고 있었다. 더불어 상품전략은 기존의 고객들의 재방문을 높이고 새로운 고객을 유입하는데 있어서 가장 중요한 영향요인으로 제시되고 있다. 둘째, 고객전략은 이용자들의 재방문의도 및 타인추천의도에 유의한 영향을 미치고 있었다. 셋째, 브랜드전략은 이용자들의 타인추천의도에 유의한 영향을 미치고 있었다. 마지막으로, 기술전략은 이용자들의 재방문의도에 유의한 영향을 미치고 있었다. The purpose of this study was to analyze the effect of price marketing strategy on the revisit and recommendation intention of screen sports theme park users. In order to accomplish the study purpose, a survey was conducted at screen sports theme parks located in metropolitan area, and a valid sample of 253 copies was obtained. The following conclusions were drawn through multiple regression analyses. First, among the sub-factors of the price marketing strategy, product strategy had a significant influence on the revisit and recommendation intention. Product strategy is suggested as the most important factor in enhancing existing users' revisit and attracting new customers. Second, customer strategy had a significant influence on the revisit and recommendation intention. Third, brand strategy had a significant influence on users' recommendation intention. Finally, technology strategy had a significant influence on the users' revisit intention.

비굴착 지하배수암거 형태별 지하배수 성능 비교분석

김현태 ( Kim Hyuntai ),유전용 ( Ryu Jeonyong ),정기열 ( Jung Kiyuol ),서동욱 ( Seo Donguk ) 한국농공학회 2018 한국농공학회논문집 Vol.60 No.6

In this study, subsurface discharge performance has been studied through theoretical seepage analysis on four types of culverts that can be installed under the condition of non-excavation, such as ⓐperforated pipe(Φ50mm), ⓑperforated pipe+horizontal mat (B50cm) ⓒperforated pipe+horizontal mat+vertical gravel(B<10cm), ⓓperforated pipe+vertical gravel(B<10cm), and existing typical type ⓔperforated pipe with gravel (B40, h=40cm) which can be installed by excavation. The analysis results were as follows. i) Subsurface discharge performance per unit (m) was ⓐtype 56%, ⓑ 91%, ⓒ 96%, ⓓ 76%, respectively, lower than the value of ⓔculvert. ii) However, considering that non-excavation culvert can be installed at a spacing of 5m with the installation cost of the existing excavation culvert at the interval of 10m, it was analyzed that unit subsurface discharge(q) of ⓐ20.2mm/day(110%), ⓑ32.8(178%), ⓒ34.6(188%) ⓓ27.5(149%) in the four types of non-excavation culvert installed at intervals of 5m under the condition of k=10^-4cm/s was much larger than the amount of ⓔtype 18.5(100%), existing excavation culvert installed at 10m interval. iii) Through the test construction, peak subsurface drainage discharge(q_p) was 38.4mm/day, which is larger than the value of design criteria and confirmed that it satisfies the analysis results as well. iv) In particular, it was evaluated that ⓑperforated pipe+horizontal mat(B50cm) are low cost, high efficiency subsurface drainage culvert type with sufficient drainage performance(178%).

관배수 겸용암거의 관배수특성과 소요통수능분석

김현태 ( Hyuntai Kim ),정기열 ( Kiyuol Jung ),박영준 ( Youngjun Park ),유전용 ( Jeonyong Ryu ) 한국농공학회 2021 한국농공학회 학술대회초록집 Vol.2021 No.-

밭작물 논 재배 확대를 위한 무굴착 암거배수 기술 개발

김현태 ( Hyuntai Kim ),정기열 ( Kiyuol Jung ),이상훈 ( Sanghun Lee ),유전용 ( Jeonyong Ryu ) 한국농공학회 2017 한국농공학회 학술대회초록집 Vol.2017 No.-

농업환경변화를 보면 농가소득이 벼보다 밭작물이 높기 때문에 기존 논에서 밭 작물재배를 원하는 농가가 많다. 하지만 저습답은 지하수위와 함수비가 높아 작물이 습해를 입기 때문에 밭작물재배에 어려움이 많다. 저습답에서 밭작물재배를 위하여, 지하암거와 심토파쇄 등의 보조공법이 적용되고 있으나, 기존 공법은 공사비가 높고, 지하배수효과가 낮은 문제가 있어, 저습답 농지범용화를 위하여 저비용 고효율 지하암거공법의 개발·도입이 필요하다. 본 연구에서 무굴착으로 시공이 가능한 암거모양별 지하배수성능을 분석하고, 공사비를 비교하여, 저비용 고효율 무굴착 지하암거공법을 제안하고, 저습답에 시험시공을 통하여 다음과 같은 결론을 얻었다. ① 무굴착시공이 가능한 ⓐ 유공관암거, ⓑ 유공관+수평필터매트(폭50cm) 암거는 단위m당 배수량은 기존 ⓒ 유공관+자갈소수재(30^*40cm)암거의 ⓐ 54%, ⓑ 92%로 적으나, m당공사비가 1/3로 기존암거를 10m간격으로 설치하는 것보다 ⓑ 유공관+수평매트암거를 5m간격으로 설치하면 공사비는 70%이나, 배수효과는 175%로 저비용 고효율 지하암거공법으로 평가·제안되었다. ② 이 결과를 바탕으로 미사질양토 저습답에 지하암거 시험시공결과, ⓒ 기존공법(7m간격)보다 ⓑ 무굴착 유공관+수평필터매트 암거(3, 5m간격)가 공사비도 적으면서, 지하수위 상승이 훨씬 적고, 하강도 훨씬 빠른 결과를 보이고 있다. ③ 토양함수비도 ⓒ 기존공법(7m간격)보다 ⓑ 무굴착 암거(3, 5m간격)가 함수비 상승도 적으면서 빠르게 작물생육의 최적함수비 상태로 되는, 훨씬 좋은 결과를 보였다. ④ 콩 시험재배결과 무암거 경구보다 기존 암거공법과 무굴착 암거설치경구가 작황이 훨씬 좋은 것으로 볼 때, 공사비가 저렴한 ⓑ 무굴착암거공법이 저습답 농지범용화에 적용이 가능한 저비용 고효율 공법으로 확인되었다. ⑤ 그리고 100^*100m의 대구획의 저습답은 규모화와 범용화 영농의 큰 장점을 가지고 있으나, 경사가 거의 없는 평지로 집중강우 시 포장 내 지표배수가 잘되지 않아, 이를 해결하기 위한 연구도 함께 필요하다는 결론을 얻었다.

PVC 주름유공관 암거의 통수능 분석 및 시험시공사례

김현태 ( Hyuntai Kim ),정기열 ( Kiyuol Jung ),이상훈 ( Sanghun Lee ),유전용 ( Jeonyong Ryu ) 한국농공학회 2018 한국농공학회 학술대회초록집 Vol.2018 No.-

In order to confirm the field applicability of the PVC corrugated drain pipe used in the non-excavated subsurface drainage system, theoretical analysis on the subsurface discharge capacity of corrugated drain pipe by spacing was conducted and the adaptability was verified through test construction in the field. 1) According to the drainage design criteria, subsurface drainage capacity is required over 30mm/day to cultivate highland crops in the lowland field, and selection of spacing and diameter of drain pipe to drain the required subsurface discharge should be considered. 2) Hydraulic conductivity with k=1*10-⁵cm/s of soil above subsurface drain pipe in low and wet paddy fields can be improved through subsoil fracture. Improved hydraulic conductivity with k=8*10-⁵cm/s and 3*10-⁴cm/s of the soil make installation of the culvert spacing S=5m and 10m possible, respectively, to sufficiently drain the designed subsurface drainage discharge. 3) On the condition of pipe spacing 5m, pipe length 100m and hydraulic head 20cm, it was analyzed that the required diameter of the drain pipe satisfying the subsurface drainage design capacity of 30mm/day (considering safety factor 2) was sufficient. 4) As a result of test construction for non-excavated corrugated subsurface drain pipe with diameter of 50mm, length of 100m, and hydraulic head of 20cm in the field, it was confirmed that installation spacing with 5m of the drain pipe sufficiently fulfilled subsurface drainage capacity of 30mm/day. This paper was made by the support of Rural Development Administration (Research Project No. PJ01281503).