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LC-MS/MS를 이용한 한국에서 유통되는 농산물의 잔류 농약 평가
이화미(Hwa-Mi Lee),허수정(Soo Jung Hu),이현숙(Hyun-Sook Lee),박승영(Seung Young Park),김남선(Nam-Sun Kim),신용우(Yong Woo Shin),최근화(Keun Hwa Choi),김성일(Sung Il Kim),남슬이(Seul Yi Nam),조대현(Dae Hyun Cho) 한국식품과학회 2013 한국식품과학회지 Vol.45 No.4
본 연구에서 한국 유통 농산물 17품목(쌀, 사과, 배, 오렌지, 복숭아, 딸기, 바나나, 파인애플, 포도, 키위, 수박, 토마토, 오이, 호박, 참외, 깻잎, 상추 등)을 대상으로 다성분 분석농약 60종을 분석하기 위하여 대상농산물의 대분류별로 곡류에서는 현미, 두류는 메주콩, 과실류에서는 감귤, 채소류는 고추, 서류에서는 감자,버섯류에서는 느타리버섯을 선정하여 회수율 실험을 수행하였다. 60% 이상의 낮은 회수율을 나타내는 성분 중 fluquinconazole, methomyl은 4가지 이상의 농산물에서 공통적으로 낮은 회수율을 나타내었다. fluquinconazole은 식품에 적용하는 식품공전 4.1.3.22의 개별 시험법을 이용한 전처리 과정을 통해 과일류, 과채류, 콩류에서 개선된 회수율 결과를 얻을 수 있을 것으로 예상되며 methomyl 은 고추, 대두, 버섯 등 식품에 적용하는 식품공전 4.1.3.15의 개별 시험법을 통해 개선된 회수율 결과를 얻을 수 있을 것으로 예상된다. 버섯, 고추에서 공통적으로 60% 미만의 낮은 회수율을 나타내었던 butocarboxim은 현재 식품공전상 개별 시험법이 존재하지 않는 항목이므로 이에 대한 개별시험법을 개발하여 다종농약다성분 시험법을 보완할 필요가 있다고 사료된다. 한국 유통 농산물 17품목(쌀, 사과, 배, 오렌지, 복숭아, 딸기, 바나나, 파인애플, 포도, 키위, 수박, 토마토, 오이, 호박, 깻잎, 상추)을 대상으로 다성분 분석농약 60종을 분석하여 농약 잔류실태를 조사하였다. 조사대상 농산물 358건 중 대부분의 농산물인 291건(81.3%)의 농산물은 농약이 검출되지 않았으며, 67건(18.7%)의 농산물에서 농약이 검출되었으나, 잔류허용기준 미만으로 검출되었다. 쌀 등 17품목에의 다소비 농산물의 농약 잔류실태를 조사한 결과 농약의 잔류량은 잔류허용기준 미만으로 ADI 대비 EDI는 0.000009%에서 0.0861%로 위해도가 아주 낮은 것으로 조사되었으며 비교적 안전한 수준으로 농산물에 대한 농약관리가 이루어지는 것으로 판단되었다. Pesticide residues in agricultural products in Korea were evaluated to create a data base to inform food policy. Pesticide residues were investigated in 17 commodities collected from 9 provinces in 2012. Our analytical method of multiresidue analysis, involved the analysis of individual recovery, linearity, limit of detection, and limit of quantitation of 60 pesticides in six matrices. The pesticides, including acetamiprid and forchlorofenuron, were evaluated in 358 agricultural samples by liquid chromatography/tandem mass spectrometry. Twenty three pesticides were detected from 67 samples. The results showed that the ratio of estimated daily intake to acceptable daily intake was 0.00009-0.0861% by the intake assessment, which means that residual pesticides in agricultural products in Korea are properly controlled.
대학생의 e-스포츠방송 시청이 소비자 태도 및 여가 인지에 미치는 영향
이화형(Lee, Hwa-Hyung),김태형(Kim, Tai-Hyung),서일한(Seo, Il-Han) 한국체육과학회 2020 한국체육과학회지 Vol.29 No.4
The purpose of this study is to investigate the relationship between college students" motivation to watch e-sports broadcasting on consumer attitude and leisure perception. To this end, the following survey was conducted on college students at universities located in Cheongju, Chungbuk. The college students" motivation to watch e-sports broadcasting consisted of questions of personal motivation, empirical motivation, public motivation, and commercial motivation, and consumer attitude consisted of personal attitude, social attitude, and psychological attitude. It consisted of leisure feeling, leisure confidence, and leisure needs. In addition, multiple regression analysis was used to analyze the results of the questionnaire. As a result of the analysis, it was found that the motivation to watch e-sports broadcasting has a positive effect on consumer attitude and leisure perception, while consumer attitude has a positive effect on leisure perception. This suggested implications of how e-sports broadcast viewing is changing the culture of college students in how to use them for leisure.
이순길,이화인,손진오,하광일,구본흔,Soon-Gil Lee,Hwa-In Lee,Jin-Oh Son,Gwang-Il Ha,Bon-Heun Koo 한국재료학회 2023 한국재료학회지 Vol.33 No.5
As a filler metal for lowering the melting point of Ag, many alloy metal candidates have emerged, such as cadmium, with zinc, manganese, nickel, and titanium as active metals. However, since cadmium is known to be harmful to the human body, Cd-free filler metals are now mainly used. Still, no study has been conducted comparing the characteristics of joints prepared with and without cadmium. In addition, studies have yet to be conducted comparing the typical characteristics of brazing filler metals with special structures, and the joint characteristics of brazing filler metals with available frames. In this study, the characteristics of junctions of silver-based intercalation metals were compared based on the type of filler metal additives, using a special structure, a filler metal sandwich structure, to protect the internal base metal. The general filler metal was compared using the structure, and the thickness of the filler metal according to the thickness was reached. A comparison of the characteristics of the junction was conducted to identify the characteristics of an intersection of silver-based brazing filler metal and the effect on joint strength. Each filler metal's collective tensile strength was measured, and the relationship between joint characteristics and tensile joint strength was explored. The junction was estimated through micro strength measurement, contact angle measurement with the base metal when the filler metal was melted, XRD image observation, composition analysis for each phase through SEM-EDS, and microstructure phase acquisition.
너싱홈(Nursing Home)프로그램이 유아의 행동발달에 미치는 영향
신은정 ( Eun Jung Shin ),김춘화 ( Choon Hwa Kim ),이화일 ( Hwa Il Lee ),이칭찬 ( Ching Chan Lee ) 미래유아교육학회 2012 미래유아교육학회지 Vol.19 No.1
본 연구는 유아가 너싱홈 방문을 통해서 노인들과 같이 활동을 전개하고 이러한 활동이 유아의 행동발달에 어떠한 영향을 주는지 살펴보는 것에 그 목적을 두고 있다. 이를 위해 춘천의 G어린이집 만 4세 유아 18명을 대상으로 선정하였다. 2010년 3월부터 12월까지 한 달에 1회씩 10회에 걸쳐 유아들과 함께 A마을을 방문하여 노인들과 같이 활동을 하였다. 본 연구는 관찰과 유아개별면담, 사전과 사후 유아 브레인스토밍, 유아 그림 자료, 담임교사 면담 등 유아들의 행동변화를 알아볼 수 있는 질적 자료를 수집하여 분석하였다. 이를 통해 세대 간 교류 프로그램이 유아의 행동변화에 어떠한 영향을 주는지, 이러한 유아들의 행동변화를 교육적 변화로 어떻게 해석할 수 있는지 밝히고자 하였다. 연구결과 너싱홈 프로그램을 경험한 유아들은 노인에 대한 인식, 돌봄에 대한 인식, 안정성, 세대 공동체 의식, 사회성 등에서 긍정적인 변화가 나타났다. This study analyzed the behavioral changes in the children who participated in the intergenerational exchange programs through observation and interviewing methods. G Nursery, children 6 years old, 18 children were selected for this study. From March to December in 2010 A total of 10 times a month to visit the village was carried. All of the children took part in the activities with the senior. This study were based on observation, individual interviews, pre and post brainstorming, picture materials, teacher interviews and so on. All research methods to learn the behavioral changes of children in the qualitative data were collected and analyzed. As a result of our study, we observed positive changes in the behavior of the children and the elderly. First, children who participated in the intergenerational exchange programs had a change in awareness of what "care" means. Children started to recognize that while they are used to being the ones who receive care, they too can help provide care to others. Second, through the intergenerational exchange programs, children developed a consideration of the weaker person. After they participated in the intergenerational exchange programs, we could confirm that the children`s perception of the elderly changed by noting the change in their daily life and behavior. Third, we confirmed that the elderly were also positively affected by their participation in the nursing home program through our observations. In addition, the children felt a sense of worth from the program and showed attitudes toward all the activities. Moreover they had a positive attitude toward the elderly.