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강제환기처리에 의한 비닐하우스재배 시금치의 노균병 발생 억제
박석희,이중환,우진하,최성용,박소득,문용선,Park, Seok-Hee,Lee, Joong-Hwan,Woo, Jin-Ha,Choi, Seong-Yong,Park, So-Deuk,Moon, Yong-Sun 한국유기농업학회 2014 韓國有機農業學會誌 Vol.22 No.1
비닐하우스 내 강제환기가 시금치 노균병 발생에 미치는 영향을 구명하기 위해 비닐하우스에 수직환기팬 및 수평공기순환팬을 각각 설치한 후 밤 동안 환기를 시킨 하우스와 환기팬을 설치하지 않은 하우스에서 시금치를 재배하면서 온도 및 습도의 변화, 시금치 생장정도 및 노균병 발생 정도를 조사하였다. 하우스 내의 온도변화는 각 하우스 별로 큰 차이가 없었으나, 밤 동안 상대습도는 수직강제환기팬을 설치한 하우스가 팬을 설치하지 않은 하우스보다 9.2% 낮게 유지되었다. 파종 60일 후에 조사한 시금치의 개체 당 생체중은 수직강제환기팬을 설치한 하우스에서는 17.8g으로 환기팬을 설치하지 않은 하우스의 10.1g과 비교하여 7.7g 높았다. 노균병은 환기팬을 설치하지 않은 하우스에서는 파종 후 20일부터 발생하기 시작하여 60일 후에는 34.7%의 이병엽률을 보였으나, 수직강제환기처리한 하우스에서는 파종 40일 후부터 발생하기 시작하였으며 60일 후 이병엽률은 4.0%로 매우 낮았다. 야간에 비닐하우스 내 공기를 수직강제환기팬을 이용하여 환기시킨 결과 환기팬을 설치하지 않은 하우스와 비교하여 시금치 수확량은 76.2% 증가되었으며, 노균병 발생은 20일 정도 늦었으며, 88.5% 노균병 발생 억제효과가 있었다. Spinach downy mildew caused by Peronospora spinaciae is the main reason of yield reduction in Korea as well as in worldwide. After forced ventilation or horizontal air circulation fans were installed to control growth conditions in green house, the changes of temperature, relative humidity (RH), growth and yield, and occurrence of downy mildew were examined. Althought here was no significant difference of temperature between the treatments, RH as 9.2% lower at nighttime by forced ventilation. In addition, final fresh weight was increased to 17.8g compared to control (10.1g), which as 7.7g enhancement. Downy mildew s tarted to show 20 days after sowing (DAS) and increased to 34.7% at 60 DAS on harvest time in control. In contrast downy mildew was occurred 40 DAS with 0.7% incidence rate and 4% at harvest by forced ventilation. The results indicated that reduction of only 9.2% of RH at nighttime by forced ventilation in greenhouse spinach growth was dramatically thrived over 76.2%. Additionally spinach downy mildew occurred 20 days later with extremely lower incident rate, which meant 88.5% reduction of downy mildew.
박석희(Seok-Hee Park),이중환(Jung-Hwan Lee),우진하(Jin-Ha Woo),최성용(Seong-Yong Choi),박소득(So-Deuk Park),박홍현(Hong-Hyun Park) 한국농약과학회 2014 농약과학회지 Vol.18 No.3
This study was conducted to develop economic injury level (EIL) of sweet potato whitefly, Bemisia tabaci, on oriental melon. In greenhouse, seedlings of oriental melon were transplanted at June 8, 2010 and we inoculated adult B. tabaci with the density of 0, 1, 5, 10, or 20 per ten leaves at July 14. Adult of B. tabaci increased approximately twenty five-fold at 60 days after inoculation in the plot of 20 adults per ten leaves. The damages on leaves and fruits by B. tabaci were started to appear at 20 days after inoculation, and the damage rates of leaves or fruits were 28.5 or 31.5 percent at 60 days after inoculation, respectively, in the plot of inoculation with 20 adults per ten leaves. The yield of oriental melon was reduced as the inoculation density of B. tabaci increased, and the relationship between inoculation density of B. tabaci and the rate of damaged fruit could be described by a linear regression Y = 0.961x + 0.0562 (R2 = 0.976). Based on the relationship, the economic injury level was 5.1 adults of B. tabaci per leaf and the control threshold estimated by 80% level of economic injury level was 4.1 adults per leaf for control of sweet potato whitefly.
박석희(Park Seok Hee) 한국부패학회 2006 한국부패학회보 Vol.11 No.4
It seems that ethics on assembly members is problem of practice, not of solution. However, it, as showed in all the rules for ethics on assembly members including law of national assembly, could be substantially improved through establishing the more stringent rules because the existing principles related to it are too abstract and ambiguous to adopt. Thus, it is necessary to arrange more reasonable and systematic criteria for ethics on assembly members within the framework on innovation of national assembly and to reestablish the roles of special committee on ethics of national assembly. Accordingly, this research aims to derive the significant issues in the ethical institutions on assembly members in Korea, and to provide the principal solutions for each issue through comparing the cases of foreign countries. A lot of precedent researches have argued ethics on assembly members only in the superficial aspects, yet this research intends to indicate the fundamental rules for it as a premise for building more productive national assembly
생체 적합성 고분자 재료를 이용한 다공성 지지체 제작에 관한 연구
박석희(S. H. Park),김효찬(H. C. Kim),양동열(D. Y. Yang) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월
Most tissue engineering strategies for creating functional replacement tissues or organs rely on the application of temporary three-dimensional scaffolds to guide the proliferation and spread of seeded cells in vitro and in vivo. Scaffolds should be satisfied following requirements; macrostructure to promote cell proliferation, pore interconnectivity, pore size ranging from 200 to 400 ㎛, surface chemistry and mechanical properties. Rapid prototyping techniques have often been used as an useful process that fabricates scaffolds with complex structures. In this study, a new process to fabricate a threedimensional scaffolds using bio-compatible polymer has been developed. It employs a highly accurate three-dimensional positioning system with pressure-controlled syringe to deposit biopolymer structures. The pressure-activated microsyringe is equipped with fine-bore nozzles of various inner-diameters. In order to examine relationships between line width and process parameters such as nozzle height, applied pressure, and speed of needle, experiments were carried out. Based on the experimental results, three-dimensional scaffold was fabricated using the apparatus. It shows the validity of the proposed process.