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임종현,신창선,조용윤 조선대학교 IT연구소 2019 정보기술융합공학논문지 Vol.9 No.2
Korea's strawberry hydroponic cultivation area was 244 ha in 2011, 664 ha in 2014, 1,148 ha in 2016, and 1,752 ha in 2018, accounting for about 30% of the total hydroponic cultivation area, 7 times higher than in 2011. This is because hydroponic cultivation is easier to work than soil cultivation, saving labor time and producing more quantities. The problem is that the fruit vegetable cultivation method in Korea is not circulating hydroponic cultivation, but a non-circulating hydroponic cultivation method that drains a certain ratio (20 to 30%) of the nutrients supplied by drainage. The drainage from acyclic hydroponic farming not only causes environmental pollution, but also increases the operating cost of hydroponic farming. In this paper, we analyze the correlation between environmental information collected in strawberry greenhouse and nutrient absorption for optimal nutrient supply for crop growth, and use multiple linear regression model through the factors that are highly correlated through correlation analysis. The optimal nutrient uptake in strawberry hydroponic culture was analyzed and estimated. Results The regression equation using the multiple linear regression model was derived as , and the R-Square value for the regression equation was 0.3184, indicating that the regression equation has about 32% explanatory power. 우리나라 딸기 수경재배 면적은 2011년 244ha에서, 2014년에는 664ha, 2016년에는 1,148ha, 2018년에 1,752ha로 전체 수경재배 면적의 약 30%를 차지하며 2011년 대비 7배나 증가한 모습을 보여준다. 이런 경향은 수경재배가 토양재배보다 작업이 용이하여 노동시간이 절약되며, 수량을 더 많이 생산할 수 있기 때문이다. 문제는 우리나라의 과채류 수경재배 방식이 순환식 수경재배가 아닌 공급양액의 일정비율(20 ~ 30%)을 배액으로 흘려버리는 비순환식 수경재배 방식이라는 것이다. 비순환식 수경재배 방식에서 배출 되는 배액은 환경오염을 유발시킬 뿐만 아니라 수경재배 운영비용의 증가를 가져오고 있다. 본 논문은 작물 생장에 최적화된 양액공급을 위해 먼저 딸기 온실에서 수집되어진 환경정보와 양액흡수량간의 상관관계 분석을 진행하고, 상관관계 분석을 통해 상관성이 높다 판단되는 요소들을 통해 다중선형회귀모델을 사용하여 딸기 수경재배 환경에서의 최적 양액 흡수량을 분석하고 추정해 보았다. 결과 다중선형회귀모델을 통한 회귀식은 과 같이 도출 되었고 회귀식에 대한 R-Square값은 0.3184로 나타나 회귀식이 약 32%만큼의 설명력을 가진다고 판단할 수 있다.
전두동 후벽에서 발생한 재발성 뇌척수액 비루 환자에서 Above and Below Technique을 이용한 내시경적 치험 1예
임종현,조용희,김경래,조석현 대한비과학회 2016 Journal of rhinology Vol.23 No.2
Cerebrospinal fluid (CSF) rhinorrhea can be caused by head trauma, brain or sinus surgery, or neoplastic sinonasal disease. There are many diverse techniques for repairing skull base defects, and recently there has been a shift from using external approaches to endoscopic approaches. The reported success rate after endoscopic repair is 97%, but CSF rhinorrhea may recur in some cases. Recently, we witnessed one case of recurrent CSF rhinorrhea from the posterior wall of the frontal sinus after a traffic accident. The patient was a 48-year-old male and had recurrent CSF rhinorrhea, severe pneumocephalus and mental change even after a CSF leakage repair operation was performed by the neurosurgeon using the periosteal flap. We successfully treated recurrent frontal CSF rhinorrhea with fat graft and mucosal graft, using the above and below approach with the guidance of a navigation system.
버섯 배지에 고추, 인삼, 녹차의 첨가로 느타리버섯(Pleurotus ostreatus)의 생장기간에 미치는 효과
임종현,조중호,김남국,박혜란,송민진,장후봉,이창수 한국버섯학회 2006 한국버섯학회지 Vol.4 No.2
고추, 인삼 또는 녹차는 흔히 접할 수 있는 특용작물로서 공통적으로 항균작용이 있는 것으로 알려지고 있다. 본 연구에서 는 고추, 인삼, 녹차를 배지에 영양원으로 첨가하여 느타리버섯의 원기 발생기간과 자실체 형성기간에 미치는 영향을 알아 보고자 하였다. 일반적으로 느타리버섯 배지의 조성은 톱밥 배지에 미강을 혼합하여 재배하고 있다. 배지는 참나무 톱밥과 미강을 일정한 조성으로 제작하고 고추, 인삼, 녹차를 5~20%로 첨가하였다. 그 결과 고추의 경우에는 원기 발생기간 및 자실체 형성기간이 단축되었으며, 인삼에서는 원기 발생기간과 자실체 형성기간에 유의적 차이가 없었다. 반면에 영양원 으로 녹차를 첨할수록 원기 발생기간이 지연되었고 자실체 형성기간은 억제되었다.
Theoretical Approach to Investigate Photocatalytic Acitivity of TiO<sub>2</sub> Nanoparticles
임종현,남연식,이진용 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
TiO<sub>2</sub> has been highlighted as eco-friendly energy source due to its photocatalytic activity. However wide band gap of TiO<sub>2</sub> lower photocatalytic performance. There have been a lot of efforts to enhance the activity by modifications such as nanostructuring, oxygen defects, chemical doping. Investigating effects of these modifications on light absorption and charge recombination by experimental method is limited due to inevitable presence of defect and ununiformed particles. In order to overcome this limit, theoretical approaches are needed. The density functional theory (DFT) methods and modeling for analyzing TiO<sub>2</sub> nanoparticles are discussed. Furthermore, chemical modification strategies such as band engineering by controlling structure of TiO<sub>2</sub> nanoparticles and introducing oxygen defects or chemical doping are also discussed. Finally, theoretical studies on excited state dynamics involving charge carrier separation, diffusion, and recombination are discussed.
주변지역 토지이용특성이 주택 가격결정에 미치는 영향: 일산신도시 공동주택을 중심으로
임종현,유진호,이주형 국토연구원 2008 국토연구 Vol.57 No.-
This study analyzes what factors affect housing price by period and type according to land use characteristics. First of all, it has been proved through Chow-test that there is a difference in housing price structure between year 2003 and 2007. Next, it has been analyzed what factors had influenced on this difference through regression analysis. As a result, center of neighborhood in 2003 and center of city in 2007 are shown to be a determinant factor. Overall study results show not only physical characteristics variables but also land use characteristics variables , of which importance is getting greater, have a great impact on housing price. Generally, considering a great impact of physical characteristics variables of housing, the relation between land use variable and housing price has a potential value. In conclusion, not only individual characteristics of housing itself but also land use characteristics variables have an impact on price determination. This study analyzes what factors affect housing price by period and type according to land use characteristics. First of all, it has been proved through Chow-test that there is a difference in housing price structure between year 2003 and 2007. Next, it has been analyzed what factors had influenced on this difference through regression analysis. As a result, center of neighborhood in 2003 and center of city in 2007 are shown to be a determinant factor. Overall study results show not only physical characteristics variables but also land use characteristics variables , of which importance is getting greater, have a great impact on housing price. Generally, considering a great impact of physical characteristics variables of housing, the relation between land use variable and housing price has a potential value. In conclusion, not only individual characteristics of housing itself but also land use characteristics variables have an impact on price determination.