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침입종 미국실새삼(Cuscuta pentagona Engelm.)의 기주식물 선호도, 기생부위 및 위해가능성
정영호 ( Young-ho Jung ),이재근 ( Jae-keun Lee ),이수인 ( Soo-in Lee ),이승연 ( Seung- Yeon Lee ),장래하 ( Rae- Ha Jang ),이승혁 ( Seung- Hyeok Lee ),조규태 ( Kyu-tae Cho ),유영한 ( Young-han You ) 한국환경생태학회 2017 한국환경생태학회지 Vol.31 No.3
이 연구는 완전 기생성 침입종인 미국실새삼(Cuscuta pentagona)의 기주선호도와 기생부위를 야외현장과 기생유도 실험 통하여 확인하여 이들 식물의 기주다양성을 알아보고 잠재적인 위해성을 제시하고자 시도하였다. 미국실새삼의 기생은 구상나무와 신갈나무와 같은 목본성 식물종(12.1%)의 목질화가 되지 않은 소지나 잎에서도 관찰되었다. 미국실새삼의 기주식물종은 국화과에 속하는 종이 가장 많았고, 과내 차지하는 기주식물종의 비율은 사초과, 마디풀과 그리고 콩과 등의 것에서 높았다. 기생 유도 실험을 통해 미국실새삼은 1종을 제외한 모든 식물에 기생할 수 있음이 확인됨으로써 이 침입식물의 분포의 제한 요인은 분산과정이라는 것을 알 수 있었다. 기주식물의 감염된 부위는 줄기와 잎 두 곳에서 대부분 나타났고, 드물게 잎이나 줄기에만 나타나기도 하였다. 이 연구로 12개 과의 기숙식물 45종(12개 과의 초본식물 33종과 목본식물 12종)을 새롭게 추가하였다. 그 중에는 조와 같은 농작물뿐만 아니라 멸종위기야생식물 6종에도 기생하였고, 특히 후자의 경우에는 미국실새삼의 기생으로 식물체가 고사까지 당하는 경우도 있었다. 이는 미국실새삼이 잠재적으로 야생식물에게도 확산될 가능성이 높다는 것을 의미한다. In order to check host plant diversity and to confirm the potential risk to be invaded, we documented host plant flora and plant part of C. pentagona, an invasive parasitic plant in field survey and induced parasitic infection by them in the laboratory experiment. Parasitic interaction(12% of total tree species) was found in twig and leaf of tree such as Quercus mongolica and Abies holophylla that was not developed into ligninfication. There were most host plant species belong to Compositae, but the species parasitic rate of family was higher in Cyperaceae, Polygonaceae and Leguminoceae. Through the inducible infection experiment with C. pentagona, all species except one species show parasitic interaction between host plan and C. pentagona. These result means that the limiting stage for invading area is dispersion process for invading other area in Korea. Infection plant part by C. pentagona was dominantly both shoot and leaf, rather than only leaf or only shoot. We found newly 12 families and 45 host plant species including 33 herbacious one and 12 woody one. Crop plant such as Setaria italica and 6 endangerd one such as Scrophularia takesimensis, especially the later rare endemic plant was to death by parasitic infection of C. pentagona. These results indicate that C. pentagona is potential risk to both wild and cultivated plant in Korea.
아연 이온화 장치의 상수 중 철 시편과 수도 배관에 미치는 부식억제 효과 예측
유미선 ( Mee-seon Yu ),이승혁 ( Seung-hyeok Lee ),최정욱 ( Jung-wook Choi ),심학섭 ( Hak-sup Shim ),양성봉 ( Sung-bong Yang ) 한국환경기술학회 2021 한국환경기술학회지 Vol.22 No.3
This study quantitatively investigated the inhibition effect of corrosion on iron coupons and water pipes by ionization of zinc metal in tap water line. After installing iron coupons into water pipes and running tap water for 20 days, the average difference of the annual corrosion rates calculated from the weight losses of iron coupons with or without the ionization device was estimated to be 12.8 %. Comparing corrosion rates with or without corrosion inhibitor on new iron coupons showed higher difference in corrosion rates, but over time, the difference of corrosion rates between absence and presence of inhibitor had decreased gradually. It was also confirmed that the less rust-free pure iron area on the iron specimen and the less pure iron surface to react with oxygen in water gradually reduces the corrosion rate. X-ray diffraction analysis of the rust generated on iron coupons confirmed that most of them were red hematite(Fe<sub>2</sub>O<sub>3</sub>), and that some of the blackish parts were magnetite. It is known that the rust generated causes red tap water to fall, some of which develop into foot corrosion, resulting in pin-holes in the water pipes. Therefore, based on existing research results, we predicted the breaking time due to foot corrosion of iron coupons with or without corrosion inhibitors. Zinc corrosion suppressors were installed in water pipes where corrosion had already progressed and rusted, and the internal surface of the water pipes was observed to increase the relative ratio of the black magnetite components over time, and it was believed that corrosion suppressors could be expected for a long time.
이온화식 상수도관 내부 부식억제기의 철 시편에 대한 부식억제 효과측정
유미선 ( Mee-seon Yu ),양성봉 ( Sung-bong Yang ),심학섭 ( Hak-sup Shim ),이승혁 ( Seung-hyeok Lee ) 한국환경기술학회 2020 한국환경기술학회지 Vol.21 No.6
This study aimed to measure the anti-corrosion effect of the zinc ionization device in running water. Cartridges of iron coupons were immersed in 2 plastic pipes that had flown the tap water for 20 days. Initial and final concentrations of ferrous ion and zinc cation in water were measured and weight losses of each coupon were weighed. And finally corrosion area of each coupons was compared with analyzing black and white figure of each corroded coupon by use of Image J program. Average weight loss of the coupons in running water with no corrosion inhibitor is 486 ㎎/dm<sup>2</sup> for 20 days, whereas that of coupons with the corrosion inhibitor is 438 ㎎/dm<sup>2</sup> for same period. Relative anti-corrosion effect of the inhibitor was calculated to be only 9.8 % with weight loss method. Average % areas of each corroded coupons with the inhibitor or no inhibitor were 20.5 % and 43.9 %. Relative anti-corrosion effect shown by average corroded area was 53.3 %. Inhibition effect of zinc ionization device in tap water indicated that corrosion area on the iron-coupon surface was decreased largely by dissolving zinc ion from zinc metal in water even though difference of weight loss of iron coupon was very small.
고은주 ( Eun Joo Ko ),고은정 ( Eun Jung Ko ),석호중 ( Ho Joong Seok ),이승혁 ( Seung Hyeok Lee ) 한국건축시공학회 2008 한국건축시공학회 학술발표대회 논문집 Vol.8 No.1
The purpose of this study is to ensure an amicable material quality control in the construction site through investigating a process which can impact the construction material quality. For it, a worker interview and questionnaire survey was conducted through a direct field visit. The visited construction sites are composed of 79% construction site and 21% engineering site. As the respondents of questionnaire survey, the quality control workers were 72% of total respondents. Next, the construction worker, handymen, field representatives and others formed 7%. The interview with the quality control staff was conducted with the items including the construction site quality control guide, incoming inspection and material management. Through this survey, the problems of quality control by progress phase were derived. It could be known that the management and measures by each phase were urgently required. It also was indicated that a selection of low-priced material caused by low price bidding could badly impact the construction and safety. Also, in relation to the opinions such as the insufficient quality control and heavy work-load, the improvements are required. For the effective quality control in the construction site, the material quality control procedures suitable for the phase of construction progress must be presented in the present quality control. Also, the standards for it need to be established.
마이크로파 여기 플라즈마광 생성을 위한 도파관 시스템 설계에 관한 연구
전상재,전후동,송창현,하석영,이승혁,이태호,박의준 금오공과대학교 2005 論文集 Vol.26 No.-
In this paper, the plasma lighting system(PLS) excited by the commercial high power magnetron is developed. The design concepts are based on maximizing the huninous efficacy in conjunction with the miniaturization of waveguide system Furthermore the fine tuning is simplified by using only one stub, and the impedance matching is maximized by introducing the tapering technique. The experimental results show that the luminous efficacy can be dramatically improved by the proposed design method.