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        • KCI등재후보

          Kinetic models에 의한 딸기 중 농약의 생물학적 반감기 비교와 생산단계잔류허용기준 설정

          박동식(Dong-Sik Park), 성기용(Ki-Young Seong), 최규일(Kyu-il Choi), 허장현(Jang-Hyun Hur) 한국농약과학회 2005 농약과학회지 Vol.9 No.3

          본 연구는 생산단계의 딸기에 4가지 살균제(tolclofos-m, folpet, procymidone, triflumizole)를 수확 10일전 안전사용 기준량으로 처리한 후 잔류량을 파악하였고, 이것을 근거로 6 가지 kinetic models(first order, zero order, second order, power function model, elovich model, parabolic model)에 따른 반감기를 비교하였다. 최적의 모델로 판명된 first order kinetic model로부터 구한 반감기를 이용하여 생산단계잔류허용기준(field tolerance)을 설정, 제시하였다. 잔류분석법의 적합성 판단을 위한 회수율 실험에서는 85.1~105.0% 범위를 보였으며, 4 가지 약제 모두 약제 처리 5일 후 평균 73% 이상 소실되었다. 잔류량과 시간과의 상관관계는 first order kinetic model에서 가장 높은 결정계수값을 보였으며, 이를 이용하여 산출한 반감기로 생산단계 잔류허용기준(안)을 설정하였다. 이와 같은 결과는 최적의 kinetic model로 반감기를 산출해야 한다는 이론적 근거를 제시하는 것이며, 수확 후 또는 유통 중의 잔류허용기준뿐만 아니라 생산단계에서도 허용기준을 마련하여 부적합 품목을 사전에 차단할 수 있는 기준설정의 예로서 안전 농산물 공급과 농가소득에 크게 기여할 수 있는 기초자료가 될 것이라 사료된다. This study was conducted to determine the amounts of pesticide residues after treatment of criterion dose with 4 pesticides(tolclofos-m, folpet, procymidone, and triflumizole) under cultivated period and to compare the biological half-life of pesticides with 6 kinetic models(first, zero and second order kinetics, power function, elovich and parabolic model) and to establish proposed field tolerance using biological half-lives. Recovery of 4 pesticides from strawberry was ranged from 85.1 to 105.5%. For all of 4 pesticides, dissipation rate was over 73% at 5 days after application. Among 6 kinetic models, first order kinetic model (FO) was best fit to describe the relationship between residual pattern of pesticides and time. Therefore, half-lives were calculated by FO for establishing the field tolerance. These results showed that half-life should be calculated by comparative best fit kinetic model and field tolerance can help to prevent unacceptable agricultural products from marketing. It is good for both consumers and farmers having safe agricultural products and financial benefits, respectively.

        • KCI등재

          임상 전 의학전문대학원생을 대상으로 한 기본심폐소생술 교육 후 지식 및 술기 수행능력의 6개월 전후 비교

          안재윤 ( Jae Yun Ahn ), 서강석 ( Kang Suk Seo ), 박정배 ( Jung Bae Park ), 정제명 ( Jae Myung Chung ), 류현욱 ( Hyun Wook Ryoo ), 강성원 ( Sung Won Kang ), 최규일 ( Kyu Il Choi ), 김윤정 ( Yun Jeong Kim ) 대한응급의학회 2009 大韓應急醫學會誌 Vol.20 No.5

          Purpose: The following study was performed to compare basic life support (BLS) skills and knowledge over a 6 months interval in preclinical medical students. Methods: Upon initial instruction, 112 first-year medical students at a teaching hospital were given instructions in BLS, their knowledge performance was evaluated by written test and skills test via checklist designed by instructors and PC SkillReporting System(R) (Laerdal, Norway). Their performance was re-evaluated 6 months after initial BLS training in an identical fashion. Evaluation was performed on 103 out of 112 students who had taken initial BLS training. Results: The results of written test showed that the students evaluated right after taking initial BLS training have better knowledge of BLS compared to students evaluated 6 months after taking initial BLS training (p<0.001). Results of skills test evaluated by checklist showed decrease in adequate performance of students evaluated 6 months after BLS education in 12 out of 18 items compared to students who have just received initial BLS training. The decreases were statistically significant in 6 items. Total scores after 6 months were also lower compared with initial scores (p<.0.001). The results of the skills test using PC Skill Reporting System(R) demonstrated that the percentage of adequate ventilation volume, compression rate, hands-off time, and hand position were each 18.4%, 46.6%, 47.6%, 84.2% initially and 5.8%, 32.0%, 32.0%, 76.1% at 6 months after initial training. Students performed significantly worse 6 months post training in 4 out of 7 items (p<0.05). Conclusion: Knowledge and skills of preclinical medical students decreased significantly after a 6 month period compared to knowledge and skills after initial training. Therefore, retraining of BLS is required within 6 months, but more study is required to determine appropriate intervals and methods of retraining.

        • KCI등재
        • KCI등재
        • KCI등재

          방울토마토중 Dichlofluanid 및 Iprodione의 생산단계별 잔류농약 경시변화

          최규일,성기용,정태균,이주환,허장현,고광용,이규승 한국환경농학회 2002 한국환경농학회지 Vol.21 No.4

          방울토마토의 생산단계에서의 잔류허용기준 설정과 수확후 저장기간중 경시변화 및 세척에 의한 잔류농약의 감소양상을 파악하였다. 해당약제를 안전사용기준의 기준량 및 배량을 각각 시설재배 포장에서 살포후 10일간 잔류양상을 조사하였고, 실온 및 냉장조건 하에서의 저장실험 및 세척에 따른 전류농약의 잔소량을 파악하여 생산단계부터, 출하, 저장, 소비단계까지의 잔류량을 예측할 수 있는 모델개발을 위한 자료로 이용하고자 연구를 수행하였다. Dichlofluanid와 iprodione은 포장조건에서 반감일수가 기준량 2.2, 3.3일 이었으며, 배량은 3.5, 5.4일로 나타났다. 저장조건하에서의 약제별 반감기는 포장조건보다 잔류량의 감소속도가 느린 것으로 나타나 반감일수가 증가하였고, 세척방법에 의한 잔류농약의 감소량을 조사한 결과 세제 사용시의 평균제거율은 dichlofluanid는 73.7%, iprodione은 64.3%로 나타났고, tap-water 사용시에는 dichlofluanid 73.5%, iprodione 63.5%로 나타났다. 이러한 결과는 작물의 생산단계에서 구한 합리적인 희귀식을 이용하여 잔류농약의 경시변화를 파악하고, 저장 및 세척과정을 거쳐 최종 소비단계에서의 잔류농약의 수준을 평가할 수 있었다. We studied the residual patterns of two fungicides, dichlofluanid and iprodione, in cherry tomato greenhouse after applying with the recommended and double dose. Also, the degradation patterns during storage periods of up to ten days were compared between at room temperature (20℃) and at cold temperature (4℃). Removal rates of fungicides by washing with tap-water and detergent solution (0.1%, 0.2%) were measured. Half-lives of dichlofluanid and iprodione in greenhouse cherrytomato were 2.2~3.5 and 3.3~5.4 days, respectively. During the storage period, the residues were dissipated more slow. Removal rates were 62.8~80.3% by tap-water, 60.4~83.1% by 0.1% detergent solution, and 65.3~77.6% by 0.2% detergent solution. So, we can predict of terminal residues from cultivation period to marketing, storage and consuming.

        • 한국어{것}의 意味機能과 用法

          崔奎一 제주대학교 1985 논문집 Vol.22 No.2

          The study is to investigate a variety of semantic functions of the word 것 {koˇs} in modern Korean according to the kinds of adjacencey in its syntactic combinations with other words, chiefly keeping in mind its syntactic meaning and its morphological(phonemic) aspects, and thus to elucidate the nature of this word. The results obtained here in this study are as follows: 1. The word {koˇs} is to be said to have flexibility with various kinds of semantic functions; i.e., it is used to refer to or anaphora for the preceding word or sentence, to describe or to emphasize and confirm the sentences, to make an end of strong demand(i.e,request), and to do the function of a nominal complement as well. 2. The word {koˇs} is quite inclusive in meaning, for it is sometimes used to have the meaning of a substantive noun in the sentence. 3. In various sentences, the word {koˇs} seems to have a different semantic functions according to the patterns of its syntactic combination. The reason for this seemingly different function does, however, not originate from the different meanings of the word itself, but from the variety of its syntactic status. 4. In context, the word {koˇs} does not have its unique meaning, but it plays the role of an auxiliary or a complement for the other words. Morever, it has the function of shift of meaning, which makes some what concrete and clear the notion of the preceding abstract word. 5. The various semantic functions and the effect of a foreign language translation into Korean make {koˇs} one of the most frequently used basic word in Korean.

        • KCI등재SCIE

          시설재배 고추중 Bitertanol 및 Tebuconazole 잔류양상

          성기용,최규일,정몽희,허장현,김정규,이규승 한국응용생명화학회 2004 Applied Biological Chemistry (Appl Biol Chem) Vol.47 No.1

          시설재배 고추중 triazole계 살균제 bitertanol과 tebuconazole에 대하여 안전사용기준의 추천량과 뱌량을 포장에 살포 후 잔류농약의 감소양상을 조사하였다. 고추중 bitertanol의 반감기는 5.2~6.1일 이었고, tebuconazole은 4.6~5.2일로 나타났다. 고추잎에서의 반감기는 bitertanol은 19.1~22.5일 이었고, tebuconazole은 16.7~20.8일로 나타나 고추에 비해 반감일수가 3~5배 증가하였다. 고추잎에서 약제 살포 24일 경과 후 bitertanol과 tebuconazole의 잔류량은 10.1㎎/㎏, 17.5㎎/㎏으로 나타났는데, 이는 고추잎에 대한 Maximum Residue Limit(MRL) 3.0㎎/㎏, 5.0㎎/㎏을 크게 넘는 수치로 조사되었다. 시설재배 고추와 고추잎에서의 경시변화는 1차 희귀방정식에 부합하였으며, 고추잎에서의 엽면잔류량(Dislodgeable Foliar Residues, DFRs)은 24일 경과 후 각각 36%, 48%가 소실되는 것으로 나타났다. 세척방법에 의한 잔류농약의 감소량을 조사한 결과 세제 사용 시의 평균제거율은 bitertanol은 72.4%, tebuconazole은 72.2%로 나타났고, 일반 수돗물 사용 시에는 bitertanol 60.3%, tebuconazole 61.5%로 나타났다. Persistence of the triazole fungicides, bitertanol and tebucnazole was investigated after their application at recommended and double rate on greenhouse-grown peppers. The half-life of bitertanol and tebuconazole on peppers at recommended and double rate was 5.2~6.1 and 4.6~5.2 days, respectively. Half-lives of bitertanol and tebuconazole on pepper leaves (16.8~22.5 days) was longer than those in the peppers. Residual concentration of bitertanol and tebuconazole on pepper leaves 24 days after application were 10.1 and 17.5 ㎎/㎏, respectively, and these levels were higher than MRL which had been established at 3.0 and 5.0 ㎎/㎏ in Korea. Pattern of dissipation was well fitted to the first-order kinetics. In household washing experiment with surfactant. dislodgeable portions on pepper leaves of bitertanol and tebuconazole were occupied 36% and 48% of the residues found 24 days after application.

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