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김희연(Hee-Yun Kim),최희주(Hee-Ju Choi),엄지윤(Ji-Yoon Eom),서은채(Eun-Chae Seo),최승희(Sung-Hee Choi),정소영(So-Young Cheong),최선희(Sun-Hee Choi),이화정(Hwa-Jeong Lee),최재천(Jae-Chun Choi) 한국식품과학회 2010 한국식품과학회지 Vol.42 No.1
HPLC/APCI-MS에 의한 dithiocarbamate계 분석법을 확립하고 아울러 국내에서 dithiocarbamate계 농약이 사용되는 쌀, 배추, 사과 등 20종 농산물에 대해 잔류실태를 조사한 본 연구의 결과는 다음과 같았다. Dithiocarbamate계 농약 검출건수는 복숭아가 10건 중 3건(30%), 고추가 14건 중 7건(50%), 양파가 12건 중 4건(33.3%), 포도가 12건 중 8건(66.7%), 토마토가 17건 중 7건(41.2%), 감자가 14건 중 4건(28.6%), 구기자가 10건 중 9건(90%), 수박이 10건 중 6건(60%), 양배추가 11건 중 8건(72.7%), 배추가 10건 중 7건(70%), 당근이 12건 중 6건(50%), 오이가 13건 중 8건(61.5%), 쌀이 13건 중 6건(46.2%), 감귤이 11건 중 8건(72.7%), 메론이 16건 중 5건(31.3%), 감이 10건 중 1건(10%), 인삼이 11건 중 1건(9.1%), 대두가 10건 중 2건(20%)으로 100건의 시료에서 42.4%의 검출율을 보였으나 사과와 배 각 10건의 시료에서는 검출되지 않았다. 이 중 기준치를 초과한 농산물은 건 구기자 3건이었으나 기준규격을 설정하여 관리되고 있다. To revise the dithiocarbamates residue analysis method and survey the residues in agricultural products that were treated with these fungicides in Korea, we purchased 20 types of foodstuffs (rice, potato, cabbage, apple etc.) from markets in five major cities. 236 samples of the purchased foodstuffs were then analyzed for the presence of dithiocarbamates by HPLC/UV and HPLC/APCI-MS. The R², LOD and LOQ in the range of 0.5-107.3 mg/L were as follows: DCC: y=174.34x+18.315, R²=0.9999, 0.01 mg/L, and 0.04 mg/L; EBDC: y=227.38x?14.715, R²=1.0000, 0.01mg/L and 0.02 mg/L; PBDC: y=38.46x?21.412, R²=0.9999, 0.04 mg/L, and 0.1 mg/L; ETU: y=52.752x?4.4819, R²=0.9?998, 0.02 mg/L and 0.03 mg/L; PTU: y=128.28x+4.4624, R²=0.9998, 0.02 mg/L, and 0.04 mg/L. The levels of DDC, EBDC, PBDC, ETU and PTU in 20 agricultural products fortified to 10.0-107.3 mg/L ranged from 61.7-117.5%, 65.3-110.1%, 61.5-109.6%, 69.3-116.3% and 70.2-97.2%, respectively. Overall, dithiocarbamates were detected in 100 samples and the detection ratio was 42.4%. Among these, only 3 samples (1.3%) of Lycii fructus had residue levels that were above the action limits, while the remaining samples (233 samples) contained levels of dithiocarbamates below the detection limit or below the Korea MRLs (Maximum Residue Limits).
리플저감 및 소형화 구현을 위한 브릭형 인터리브드 포워드컨버터에 관한 연구
민성기(Seong-Ki Min),이홍학(Hong-Hak Lee),이성욱(Sung-Wook Lee),엄지윤(Ji-Yoon Eom) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.11
A DC-DC converter is a device that changes the voltage level through which DC flows and is generally used to convert input sources. Currently, DC-DC converters are being developed into brick-type modules whose sizes are standardized and can be installed and replaced in various applications. In addition, the importance of miniaturization through high power density is gradually emerging in order to output high power within a limited size. In order to increase power density within a limited size, it is necessary to select an optimal topology considering operating parameters such as switching frequency and current ripple, the size and number of various devices and components, and to design a circuit through precise analysis. This paper proposes an interleaved forward topology to achieve ripple reduction and miniaturization of brick DC-DC converter modules. The proposed interleaved forward topology is a topology optimized for miniaturizing brick-type modules with limited size. Planar type 2-transformer parallel structure increases power density and the primary side switches without an off-period to transfer energy to the secondary side without an off-time to maintain continuity of output. As a result, ripple voltage can be minimized and miniaturized design is possible without an output inductor that occupies a large size. In the text introduces the circuit configuration, operating principles, and main features, and explains the excellence of the proposed topology method through the actual manufactured shape and test results.
곡류, 두류, 서류 및 그 가공품 중 다환 방향족 탄화수소 (polycyclic aromatic hydrocarbons) 화합물 함량
김희연(Hee-Yun Kim),정소영(So-Young Chung),소유섭(Yo-Sub Sho),박성수(SeongSoo Park),이은주(Eun-Ju Lee),서정혁(Jung-Hyuk Suh),이윤동(Yun-Dong Lee),최우정(Woo-Jeong Choi),김정수(Jung-Soo Kim),엄지윤(Ji-Yoon Eom),박희옥(Hui-Og Park),진명식 한국식품과학회 2005 한국식품과학회지 Vol.37 No.4