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발아조건과 배지종류 및 양액 농도에 따른 식물공장 재배 청경채와 상추의 묘 생육특성
최효길(Hyo-Gil Choi),권준국(Joon-Kook Kwon),박경섭(Kyoung-Sub Park),강윤임(Yun-Im Kang),조명환(Myeong-Whan Cho),노일래(Il-Rae Rho),강남준(Nam-Jun Kang) (사)한국생물환경조절학회 2011 생물환경조절학회지 Vol.20 No.4
본 연구는 식물공장에서 청경채와 상추의 발아조건과 육묘배지 및 육묘 시 양액농도가 묘의 생육에 미치는 영향을 구명하고자 수행되었다. 청경채와 상추의 발아율은 광의 유무와 온도처리(15, 20, 25℃) 간에 유의적 차이가 없었으나, 육묘배지 간에는 우레탄스펀지의 경우 파종 전ㆍ후 수분관리 유ㆍ무에 따라 큰 차이를 보였다. 즉, 우레탄스펀지 배지에서 파종전ㆍ후 수분관리를 하지 않았을 경우 암면에 비해 발아율이 현저히 낮았으나, 수분관리를 해주었을 때에는 암면보다 발아율이 높았으며, 묘의 생육도 암면과 차이가 없었다. 그리고 청경채의 생체중은 EC 1.0dSㆍm?¹에서 1.5dSㆍm?¹에서보다 1.8배 무거웠고, 0.5dSㆍm?¹에서보다는 6배 무거웠다. 상추의 생체중 또한 EC 1.0dSㆍm?¹이 1.5dSㆍm?¹와 0.5dSㆍm?¹에 비해 1.7배와 3.5배 각각 무거웠다. This experiment was conducted to study the effects of germination condition, nursery media and nutrient concentration in plant factory on the growth characteristics of pak-choi and lettuce seedlings. The results showed that temperature (15, 20, 25℃) and light conditions (lighting and no lighting) had no significant effect on germination rate of pak-choi and lettuce, whereas the interaction of growing media (rockwool and urethane sponge) and moisture management before and after sowing had significant effect on germination percentage. In case of no moisture management before and after sowing, germination percentage was much higher in rockwool medium than urethane sponge medium. But germination percentage of urethane sponge was higher than that of rockwool with applying moisture before and after sowing. At the nutrient concentration of EC 1.0 dSㆍm?¹ the fresh weight of pak-choi was heavier than in EC 1.5 and 0.5 dSㆍm?¹ by 1.8 and 6.0 times, respectively. At the nutrient concentration of EC 1.0 dSㆍm?¹ the fresh weight of lettuce was also heavier than in EC 1.5 and 0.5 dSㆍm?¹ by 1.7 and 3.5 times, respectively.
최효,Choi, Hyo 한국해양학회 1984 韓國海洋學會誌 Vol.19 No.2
Diurnal variations of coastal surface wind speed are analyzed with five years of hourly wind from Port Aransas, Texas. These data reveal the highest frequency of occurrence of the nighttime wind maximum near midnight, especially during those seasons when onshore flow prevails. Nighttime wind maxima with a southerly component occurred approximately three times more frequently than with a northerly component on the annual average. The neutral atmospheric stability prevails near the coast. Thus it allows downward transfer of momentum from the nocturnal low level jet under the onshore wind situation and strong wind shear between an elevated frontal and ground-based inversion for offshore wind, resulting in the nocturnal coastal surface wind maximum.
자작 자동차 설계를 위한 차량 동역학 모델링과 시뮬레이션
최효서(HyoSeo Choi),권양선(YangSeon Kwon),이태섭(TaeSeob Lee),이종선(ChongSun Lee) 한국자동차공학회 2018 한국자동차공학회 부문종합 학술대회 Vol.2018 No.6
자작 자동차 설계 시에 차량 동역학 시뮬레이션을 통해 차량의 주행성능 및 구조적 안정성을 확인고자 하였다. 동역학 시뮬레이션을 수행하기 위하여 실제 자작자동차의 CAD 모델을 반영한 차량을 아담스뷰에서 모델링하였고, 실제 주행을 모사하기 위하여 스텝 스티어링에서의 차량의 동적 성능과 조인트 힘을 구하였다. 동적해석에서 구한 조인트 힘을 너클에 적용하여 구조 해석을 수행함으로써 부품의 안정성을 확인하였다. 차량을 제작하기 전에 시뮬레이션을 통해 차량의 동역학적 성능과 구조적 안정성을 파악함으로써 차량설계의 수정 및 제작 비용의 절감을 기대할 수 있다.
개별소비세 일몰제가 회원제골프장의 내장객변화에 미치는 영향
최효기(Choi Hyo-Ki),유선종(Yoo Seon-Jong) 한국주거환경학회 2011 주거환경(한국주거환경학회논문집) Vol.9 No.2
This study attempted to analyze the monthly trends of golf course visitors per hole between two groups of the members-only golf courses in the metropolitan area of Incheon and Kyonggi province and of the non-metropolitan area of Kangwon and Chungcheong provinces before the application of reduction and exemption of the individual income taxes(21 months between Jan, 2007 and Sept, 2008) and during its period(27 months between Oct, 2008 and Dec, 2010) due to changes in the tax policy of government in the operation of the members-only golf course. For this purpose, this study employed the analysis instrument such as PASW Statistics(Version 18). As a result, the following findings were obtained: An attempt was made to analyze the hypothesis that the "reduction and exemption of the individual consumption taxes would reduce visitors to the golf courses in the metropolitan area and increase those in the non-metropolitan area such as Kangwon and Chungcheong areas." Statistical analysis showed that the hypothesis was significant. That is, it was found that there was no difference in the result of T-test of the matched sample using data on the number of visitors to the members-only golf courses in the central area(Kyonggi, Incheon, Kangwon and Chungcheong areas) before the enforcement of reduction and exemption of the individual consumption tax and during its period. The average number of the golf course visitors was reduced. And it was found that there was a difference in the mean between two groups of the members-only golf courses in the non-metropolitan central area(Kangwon and Chungcheong areas). The average number of the visitors increased. But an attempt was made to compare the trend of increase and decrease of the number of visitors per hole and that of increase of the number of simple golf course visitors. As a result, it was found that the number of visitors per hole reduced though the mean of the number of visitors was greatly increased. It is thought that it is more significant to use data on the number of simple golf course visitors in order to judge the effectiveness of the sunset law of the individual consumption tax. To investigate changes in the number of visitors per hole, it is thought that it is necessary to assume the rate of increase in holes for analysis.