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사과 및 들깻잎 중 이산화염소수를 활용한 농약 저감화 연구
오예진,황인성,박상원,최근형,류송희,권혜영,황은선,김진효,이효섭 한국농약과학회 2019 농약과학회지 Vol.23 No.3
Chlorine dioxide (ClO2) known as an eco-friendly food additive was used to reduce pesticide residues from the apple and perilla leaf. The experimental conditions were established with treatment concentrations of aqueous ClO2 at 0, 10, 25, 50, 100 mg/L (apple), 0, 5, 10 25, 50 mg/L (perilla leaf) and treatment time for 0, 1, 5, 10, 20 min. As a result, effects of reduction for pesticides residues were improved as increase of treatment time and concentration on ClO2. Especially, the rate of reduction on apple for acetamiprid and dinotefuran at apple were 80.5%, 90.6% and higher rate of degradation than other pesticides, because, two pesticides have the chemical properties of low log P and high solubility in water. On the perilla leaf, the reduction of azoxystrobin and carbendazim, which have the bonds that were easy to oxidize were greatest at 91.0% and 90.4% respectively. These results showed that ClO2 treatments is available method to reduce the pesticide residues on fresh fruits and vegetables. 본 연구에서는 친환경적 식품첨가제인 이산화염소수를 이용하여 농산물 잔류농약 저감효과 구명 연구를수행하였다. 시험방법은 상이한 농도 및 시간 조건을 설정하여 실험을 진행하였다. 이산화염소수 농도 0, 10, 25, 50, 100 mg/L(사과), 0, 5, 10, 25, 50 mg/L(깻잎)와 처리시간 0, 1, 5, 10, 20분 처리하여 저감효과를 확인하였다. 실험결과 시간 및 농도에 따라 저감효과가 증가하는 양상을 보였다. 사과에서의 이산화염소 처리에 따른 잔류양상은acetamiprid와 dinotefuran에서 최대 저감률이 이산화염소 농도 100 mg/L, 처리시간 20분에서 80.5%, 90.6%로 다른농약에 비하여 높았다. 두 농약의 낮은 log P와 높은 solubility in water 화학적 특성 때문에 다른 농약에 비하여 저감효율이 높은 것으로 판단된다. 또한, 깻잎에서는 azoxystrobin과 carbendazim에서 최대 저감률이 91%, 90.4%로 높게 나타났는데, 두 농약은 산화반응 쉽게 일어날 수 있는 결합이 존재하여 다른 농약에 비하여 높은 저감률을 얻을수 있을 것으로 판단된다. 이번 연구의 결과를 통해 이산화염소가 신선농산물의 잔류농약 저감효과 기술로 활용할수 있을 것으로 판단되어 진다.
오예진,박혜미,박종선,박은지,김진필,정훈,김지원,김태형,정성묵,김기혁,양환석,Oh, Ye Jin,Park, Hye Mi,Park, Jong Seon,Park, Eun Ji,Kim, Jin Phil,Jeong, Hoon,Kim, Ji Won,Kim, Tae Hyoung,Jeong, Seong Mook,Kim, Ki Hyuck,Yang, Hwan Seok 한국광학회 2021 한국광학회지 Vol.32 No.5
본 논문에서는 단파장 영역인 1018 nm에서 최고 출력 626 W를 가진 고출력 이터븀(ytterbium, Yb) 첨가 광섬유 레이저에 대해 보고한다. Yb 광섬유 레이저에서 이득률이 낮은 단파장 영역인 1018 nm에서 레이저를 발진시키기 위한 조건을 이론적으로 조사해보고, 광섬유 끝 단단면 조건에 따른 되먹임 신호를 측정하여 안정적인 레이저 발진 조건에 대하여 연구하였다. 그 결과를 바탕으로 제작한 단일 공진기 구조의 Yb 광섬유 레이저 시스템으로부터 729 W의 펌프 출력에서 최고 출력 626 W의 1018 nm 파장 레이저 출력을 안정적으로 얻을 수 있었으며 그때 기울기 효율은 86.6%로 측정되었다. 본 연구에서 얻은 1018 nm 파장의 Yb 광섬유 레이저 결과는 지금까지 국내에서 보고된 1030 nm 이하 단파장에서 발진된 Yb 광섬유 레이저 출력 중 가장 높은 출력이며, 세계적으로도 상용 Yb 광섬유와 광부품을 사용한 결과 중 가장 높은 출력에 해당된다. 그리고 향후 더 높은 출력을 얻기 위한 방법에 대해 논의하고자 한다. High-power continuous-wave operation of a Yb-doped double-clad fiber laser at 1018 nm, pumped by high-power diode lasers at 976 nm, is reported. Based on numerical calculation of the gain and laser signal power along the length of the Yb fiber, it is found that robust operation at 1018 nm can be achieved for a high Yb<sup>3+</sup>-ion excitation density greater than 11.5%, accompanied by high suppression of the feedback from the fiber's end facet. The Yb fiber laser constructed in house yields 626 W of continuous-wave output at 1018 nm for 729 W of incident pump power, corresponding to a slope efficiency of 86.6%. The prospect for power scaling is considered.
병원 임상 실습이 응급구조과 학생들의 심폐소생술 수행능력과인식에 미치는 영향: 전후 연구
오예진,김균무,서영우,고승현,김동훈,장태창 대한응급의학회 2018 대한응급의학회지 Vol.29 No.3
Objective: Various educational programs have been implemented to achieve skill, willingness and self-confidence in performing cardiopulmonary resuscitation (CPR). Paramedic students usually participate in clinical practice in emergency department as one of their educational courses. We investigated the effects of hospital based clinical practice and participation in real cardiac arrest situation on paramedic students’ CPR performance and recognition. Methods: Eighty-one paramedic students from 10 different universities who received hospital based clinical practice for 3 or 4 weeks in a regional emergency medical center from December 2016 to August 2017 were enrolled in our study. Subjects were asked, using a questionnaire, about their confidence and willingness to perform CPR before and after clinical practice. We also objectively measured two minute-CPR performance using the Laerdal skill reporter before and after clinical practice. During clinical practice, students participated in real CPR situations and took several theoretical examinations; however, additional CPR practical training was not included. Results: This study included 48.1% male volunteers and 70.4% respondents who had Basic Life Support provider certification. The average number of real CPR situations participated in was 8.35 times. Scores in confidence of CPR increased significantly (3.80 vs. 4.36, P<0.001) after clinical practice; however, scores in willingness to conduct CPR were high in both groups (4.46 vs. 4.48, P=0.787). Average chest compression depth also increased significantly (51.3 mm vs. 55.5 mm, P<0.001) after clinical practice, but average compression rate showed no difference (111 vs. 111, P=0.694). Correct hand positioning and chest recoil also showed no difference between groups. Conclusion: Hospital based clinical practice of paramedic students could provide extra confidence in student’s ability to perform CPR and lead to adequate chest compression depth.