http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 허예진(Ye Jin Heo) (검색결과 11 건)
- 무료
- 기관 내 무료
- 유료
-
허예진,심기현,최해연,김순임,Heo, Ye-Jin,Sim, Ki-Hyeon,Choi, Hae-Yeon,Kim, Sun-Im 한국식품조리과학회 2010 한국식품조리과학회지 Vol.30 No.2
The objectives of this study were to investigate the antioxidative activity of crackers made with a guava(Psidium guajava Linn.) leaf extract harvested in Korea. Guava leaf extraction using boiling water showed significantly higher antioxidative activities than extracting using 70% ethanol based on the higher total phenolic contents, FRAP, and ABTS assays(p<0.05). The crackers containing 1% guava leaf extract, and 0.075% BHT were stored at $63^{\circ}C$ for 7 days for the Schaal oven test, and the oxidative stability(AV, POV), antioxidative activity(DPPH, FRAP, ABTS assay), and sensory evaluation were compared. The crackers containing 1% guava leaf extract were found to have a higher oxidative stability than the control due to a lower acid value and peroxide value after 7 days of storage. The antioxidative activities of the crackers containing 1% guava leaf extract was the highest after 7 days as determined in the DPPH and ABTS assay, and was lower than crackers containing 0.075% BHT after 4 days as assessed by the FRAP assay. In the sensory evaluation, the crackers containing the 1% guava leaf extract had the highest scores in terms of taste, texture, and overall palatability than others at increasing storage time. As a result, the addition of 1% guava leaf extract harvested in Korea increased the antioxidative effect as well as the sensory acceptability of crackers.
-
허예진 ( Ye Jin Heo ),조정호 ( Jeong Ho Cho ) 한국공업화학회 2019 공업화학전망 Vol.22 No.3
나노스케일 구조를 갖는 납 기반 할로겐화 페로브스카이트는 조절 가능한 방출 파장과 결함 내성(defect-tolerance)을 가지며, 높은 광 발광 양자 수율과 물질의 실온 합성 가능성으로 인해 최근 많은 관심을 받았다. 이러한 특성은 디스플레이에 적용되었을 때, 넒은 색 영역을 표현할 수 있다. 그러나 납의 독성이 페로브스카이트 디스플레이의 상용화를 방해한다. 따라서 최근에 비납계 할로겐화 페로브스카이트 나노결정에 대한 연구가 진행되었다. 본 글에서 우리는 비납계 페로브스카이트 나노결정의 설계 및 광 물리적 특성 및 발광 소자로의 응용에 대한 우리의 견해에 대하여 서술하며, 할로겐화 페로브스카이트 나노결정의 특징, 납을 대체할 수 있는 후보 원소에 대한 논의, 콜로이드성 비납계 페로브스카이트 나노결정을 합성하는 방법, 이들의 광학 특성을 제어하고 향상시키는 방법, 발광소자에서 비납계 페로브스카이트 나노결정을 사용한 최근의 연구 동향 및 이 분야에 대한 전망을 서술한다.
-
시금치에서 살충제 Etoxazole과 Cartap hydrochloride의 잔류양상
허예진 ( Ye-jin Heo ),곽세연 ( Se-yeon Kwak ),이상협 ( Sang-hyeob Lee ),이동주 ( Dong-ju Lee ),최재원 ( Jae-won Choi ),오지은 ( Ji-eun Oh ),김장억 ( Jang-eok Kim ) 한국환경농학회 2021 한국환경농학회 학술대회집 Vol.2021 No.-
Pesticides help in increased yield of agricultural products by controlling pests, pathogens and weeds, but threaten food safety if used incorrectly. Therefore, it is necessary to establish the ‘safe use standards’ for pesticide application to allow pesticide residues be in safe limit. In this study, residual patterns of etoxazole and cartap hydrochloride were investigated in spinach. Etoxazole (10%, SC) and cartap hydrochloride (50%, SP) were diluted 4,000 and 1,000 times, respectively, and sprayed twice with 7 days interval at 21, 14, 10, 7, 3 and 0 days before harvest. Residual amounts of etoxazole and cartap hydrochloride were analyzed by LC-MS/MS. The recovery test was conducted at two levels (0.01 and 0.1 mg/kg), and the recovery rate was 80.8~112.4% with the standard deviation of ≤ 5.8. For cartap hydrochloride, the residual amounts of nereistoxin were analyzed and converted to calculate total residue. The residue of etoxazole decreased from 1.39 mg/kg to 0.01 mg/kg with the reduction rate 99.3% at 21 days after application. On the other hand, cartap hydrochloride (including converted residual amount of nereistoxin) showed 71.3% reduction from 1.72 mg/kg to 0.49 mg/kg. Etoxazole decreased faster than cartap hydrochloride because cartap hydrochloride is converted to nereistoxin prior to decreasing. As each of the pesticides behaves differently in different plant matrics, it is important to know the residue pattern separately to ensure safe application. Hence, the findings of this study will help to establish the safe use standards for field application as well as MRLs for spinach for these two pesticides.
-
-
-
GC-MS/MS를 이용한 축산물 시료 중 29종 농약의 다성분 분석법 개발
이상협 ( Sang-hyeob Lee ),곽세연 ( Se-yeon Kwak ),이동주 ( Dong-ju Lee ),허예진 ( Ye-jin Heo ),최재원 ( Jae-won Choi ),오지은 ( Ji-eun Oh ),김장억 ( Jang-eok Kim ) 한국환경농학회 2021 한국환경농학회 학술대회집 Vol.2021 No.-
The optimization and validation of multi-residue analysis for 29 pesticides in various meat matrices were evaluated. The developed method was validated in five meat matrices (pork belly, sirloin, chicken drumstick, lard, and beef tallow according to the CODEX guideline in terms of recovery, precision, calibration curve linearity, the limit of quantitation (LOQ) and matrix effect. In this study, meat samples were extracted using a QuEChERS extraction followed by optimization of sample clean-up. The clean-up method was then compared and optimized based on the d-SPE(PSA, C18, Z-SEP) and SPE cartridges(aminopropyl, C18, florisil). For the optimized analysis method, it is suitable to use the SPE cartridge as a clean-up method rather than d-SPE in order to improve the sensitivity of pesticides and reduce the matrix effect. In the clean-up method using the SPE cartridge, the use of the C18 SPE cartridge met most of the pesticide recovery criteria. The results of the optimized method showed that above 85% of pesticides gained the LOQs results of below 0.01 mg/kg, and over 90% of pesticides achieved good calibration curve linearity results (R2 > 0.99). As a result of the recovery test applied in an optimal method, more than 80% of the pesticides in the sample of pork belly, sirloin, and chicken drumstick satisfied recovery and precision criteria. In contrast, in lard and beef tallow, only 65% of pesticides met recovery and precision criteria. Therefore, it was confirmed that the recoveries measurement pesticide depends on the fat content of the samples. It can be seen that this fat content also affects a matrix effect. The average matrix effect was 16.6 ~ 30.7% in the samples of pork belly, sirloin, and chicken drumstick, while the average matrix effect was over 50% in the pork and beef fat sample. Although the matrix effect was different for each pesticide, most of the pesticides were affected by ion enhancement. In conclusion, it is judged that it will be possible to use it as a multi-residue analysis method for 29 pesticides on the meat sample.
-
살충제 Ethoprophos의 비의도적 오염에 따른 후작물 흡수이행
곽세연 ( Se-yeon Kwak ),이상협 ( Sang-hyeob Lee ),이동주 ( Dong-ju Lee ),허예진 ( Ye-jin Heo ),최재원 ( Jae-won Choi ),오지은 ( Ji-eun Oh ),김장억 ( Jang-eok Kim ) 한국환경농학회 2021 한국환경농학회 학술대회집 Vol.2021 No.-
With the implementation of the PLS, the issue of unintentional contamination in soil and the transfer of pesticides used in cultivation of preceding crops to succeeding crop was raised. To assess the safety of succeeding crop, this study was investigated the uptake and translocation of ethoprophos sprayed on Korean cabbage cultivation soil as preceding crop to succeeding crop “spinach”. Ethoprophos(5% GR) was treated on soil with the recommended dose and 5 times of that dose according to the safe use guidelines of Korean cabbage after seeding. On the 4 days after harvesting of preceding crop, spinach was sowed and collected 5 times with 3 days interval during harvesting period. The initial residual amounts of ethoprophos in soil was 7.081-19.493 mg/kg and degraded by 3.832-7.218 mg/kg until the harvest of Korean cabbage, and then finally degraded by 0.011-0.079 mg/kg after spinach cultivation. The uptake rates of ethoprophos from soil by Korean cabbage were 0.01-0.03% and distributed root(0.150-0.903 mg/kg) and shoot(0.021-0.151 mg/kg), respectively. The residual amounts of uptake and translocation from preceding crop cultivated soil to spinach edible part were found to be below LOQ. Since the residual amount of ethoprophos in spinach was less than MRL(0.02 mg/kg) with no concern for the uptake and transfer of succeeding crop. Therefore, it is not necessary to consider the plant back internal(PBI) on ethoprophos for sequential cultivation of leafy vegetables.
-
접촉 감염 및 편리성을 개선한 비접촉 PLC(Programmable Logic Controller)접점제어 구현에 관한 연구
박명석 ( Myung-suk Park ),곽성주 ( Seong-ju Kwak ),안중현 ( Jung-hyun An ),조정호 ( Jung-ho Cho ),허예진 ( Ye-jin Heo ) 한국정보처리학회 2022 한국정보처리학회 학술대회논문집 Vol.29 No.2
본 연구는 전기전자기기를 비접촉 ON/OFF제어와 기기의 수명연장을 개선 시키기위해 전기전자기기에 다용도로 활용되는 제어컨트롤러 모듈인 PLC(Programmable Logic Controller)의 입력측에 마이크로컨트롤러 와 AI 비젼카메라를 설치하여, 비접촉 ON/OFF 제어에 관한 아이디어 제시하고, 이를 기반으로 구현하였다. 구현 결과 단순 I,O 신호에 의한 제어와는 다르게 이미지 인식을 구체적으로 구분하여 센싱하고, 다양한 인식 구분을 위해 머신러닝 기반으로 AI 비젼카메라를 학습시킨 결과 물체 및 색깔 구분에 따라서 전기전자기기를 제어 할 수 있었으며, 접촉이 아닌 비접촉 ON/OFF 제어가 간단하게 구현되어, 전기전자기기 수명연장도 기대 할 수 있게 되었다.
-
-
살충제 Sulfoxaflor 및 대사체들의 토양 잔류 특성
곽세연(Se-Yeon Kwak),강자군(Ja-Gun Kang),이상협(Sang-Hyeob Lee),남애지(Ae-Ji Nam),이동주(Dong-Ju Lee),허예진(Ye-Jin Heo),김장억(Jang-Eok Kim) 한국농약과학회 2020 농약과학회지 Vol.24 No.3
In order to understand the behavior of the insecticide sulfoxaflor and its metabolites in the soil, the residual patterns, adsorption and desorption properties, and degree of reduction in soil were investigated. To study the role of soil microbes on residual pattern of sulfoxaflor in soil, as the results of the biological half-life of sterilized and non-sterilized soil, it was calculated in the range of 69.3-138.6 days in sterilized soil and 16.5-19.3 days in non-sterilized soil. Sulfoxaflor and its metabolites were found to be higher in the soil with organic matter (sulfoxaflor and X-1 : 99%, X-2 : 98%), and lower amount of tested chemical were found in the soil without organic matter (sulfoxaflor : 76%, X-1 : 79%, X-2 : 67%). Thus, the adsorption of sulfoxaflor and metabolites was affected by soil organic matter. However, the desorption rate of sulfoxaflor was high regardless of the presence or absence of soil organic matter. The results of Fenton reaction to reduce residual sulfoxaflor and its metabolites in the soil was as followed. When Fe<SUP>2+</SUP> (ferrous) was treated, the degradation rate was 2.4% for sulfoxaflor, and 15.7-49.2% for metabolites, which was higher than that of 1.3% of sulfoxaflor and 1.9-9.8% of metabolites when treated with Fe3+ (ferric). Additionally, the reaction kinetics was accelerated when H₂O₂, UV, and persulfate were treated together (with Fe<SUP>2+</SUP> : 40.2-100.0%> with Fe<SUP>3+</SUP> : 1.2-100.0%) and effective degradation has been achieved up to 100%.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
